CN114959320B - Production method of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese - Google Patents
Production method of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese Download PDFInfo
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- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 184
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 170
- 239000011574 phosphorus Substances 0.000 title claims abstract description 170
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 229910052796 boron Inorganic materials 0.000 title claims abstract description 77
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 75
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 229910000616 Ferromanganese Inorganic materials 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- 239000011572 manganese Substances 0.000 claims abstract description 119
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 97
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 81
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 77
- 239000000956 alloy Substances 0.000 claims abstract description 77
- 238000007670 refining Methods 0.000 claims abstract description 68
- 239000002994 raw material Substances 0.000 claims abstract description 61
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000003723 Smelting Methods 0.000 claims abstract description 36
- 238000007599 discharging Methods 0.000 claims abstract description 22
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000002893 slag Substances 0.000 claims description 116
- 229910000676 Si alloy Inorganic materials 0.000 claims description 93
- 239000007788 liquid Substances 0.000 claims description 93
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims description 93
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 28
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 26
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 26
- 239000004571 lime Substances 0.000 claims description 26
- 229910052710 silicon Inorganic materials 0.000 claims description 26
- 239000010703 silicon Substances 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 19
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 14
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 14
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 10
- 241001062472 Stokellia anisodon Species 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 24
- 239000010959 steel Substances 0.000 abstract description 24
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 21
- 238000000034 method Methods 0.000 description 16
- 230000008569 process Effects 0.000 description 16
- 238000006479 redox reaction Methods 0.000 description 9
- 230000009467 reduction Effects 0.000 description 9
- 238000006722 reduction reaction Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000000926 separation method Methods 0.000 description 6
- 206010039897 Sedation Diseases 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000036280 sedation Effects 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- 229910052814 silicon oxide Inorganic materials 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Abstract
The invention discloses a production method of low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese, which comprises the following steps: (1) proportioning raw materials according to a raw material proportion; (2) adding the raw materials into a refining electric furnace; (3) smelting; (4) Discharging the alloy to obtain the finished product of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese. The production method can control the content of harmful elements such as nitrogen, boron and phosphorus in the low-carbon ferromanganese, and the mass percentage of nitrogen in the produced low-carbon ferromanganese is less than 0.015 percent; the mass percentage of boron is less than 0.008%; the mass percentage of the phosphorus is less than 0.1 percent, and the low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese product produced by the invention can improve the performance of steel products and meet the requirements of smelting low-carbon manganese-containing special steel and military steel.
Description
The technical field is as follows:
the invention belongs to the technical field of ferroalloy smelting, and particularly relates to a production method of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese.
Background art:
the nitrogen element belongs to harmful elements for steel, the content of the nitrogen element can directly influence the welding performance, high-temperature toughness and plasticity of the material, the aging and cold brittleness of the steel are aggravated when the nitrogen content is increased, and the nitrogen content is not controlled in the existing low-carbon ferromanganese production process. The volume fraction of nitrogen in the air accounts for about 78%, and the nitrogen in the air is absorbed by the alloy in the production process of the low-carbon ferromanganese, so that the nitrogen content in the low-carbon ferromanganese alloy is about 0.10%.
In some steels, the boron content is trace, generally 0.002-0.005%, while the boron content in normal iron alloys cannot meet the requirements.
Phosphorus is a harmful impurity element for most steel grades, and can increase the strength and hardness of steel, but can cause remarkable reduction of plasticity and impact toughness. Particularly at low temperatures, it causes the steel to become significantly brittle, a phenomenon known as "cold shortness". The cold brittleness deteriorates the cold workability and weldability of the steel, the higher the phosphorus content, the greater the cold brittleness, so the control of the phosphorus content in the steel is tighter. High-grade and high-quality steel: p is less than 0.025 percent; high-quality steel: p is less than 0.04 percent; ordinary steel: p is less than 0.085 percent. The prior low-carbon ferromanganese contains high phosphorus (P is more than or equal to 0.20 percent) and can not meet the requirement of high-quality steel.
The modern industrial production has higher and higher requirements on the quality of steel, so the nitrogen, boron and phosphorus contents of the low-carbon ferromanganese need to be controlled in the aspect of raw materials in the steel production.
The low-carbon ferromanganese is one of important raw materials of stainless steel, high-manganese heat-resistant steel, alloy steel, structural steel, tool steel and welding electrodes, can be used as an additive of alloy elements, can also be used as a deoxidizing and desulfurizing agent, and is widely used for producing low-carbon manganese-containing special steel and military steel. At present, the production of low-carbon ferromanganese needs to add manganese ore and lime into a furnace top bin according to the batch proportion, after adding low-carbon manganese-silicon alloy, descending an electrode for arc striking, after current is stabilized, adding furnace charge into a furnace for smelting, after the alloy silicon is qualified, opening a hole for tapping, allowing iron slag to flow into a ladle together, after tapping, hoisting the ladle by a crane for slag separation treatment, pouring liquid alloy into a pouring pool, after solidification, clamping by an iron clamp, and placing on a finishing plate for cooling. And after finishing, conveying the product to a finished product room for small-granularity processing. At present, the control of nitrogen, boron and phosphorus is not emphasized in the production process, raw materials are not selected, the smelting process design and process parameter control are unreasonable, the boron and the phosphorus are high, and the nitrogen is increased when the alloy meets air.
The invention content is as follows:
the invention provides a production method of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese according to high standard requirements of a steel mill on nitrogen content, boron content and phosphorus content of low-carbon ferromanganese.
The invention is implemented by the following technical scheme: a production method of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese comprises the following steps: (1) proportioning raw materials according to a raw material proportion; (2) adding the raw materials into a refining electric furnace; (3) smelting; (4) Discharging the alloy to obtain a finished product of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese; wherein,
(1) The raw materials are proportioned according to the following mass portions: 13-17 parts of low-phosphorus manganese ore and 8-12 parts of low-phosphorus lime; when selecting raw materials, manganese ore and lime with low phosphorus content are selected, and B in manganese ore is reduced by silicon 2 O 3 The boron can enter the low-carbon ferromanganese, and the boron content can be less than 0.008 percent by proportioning according to the invention.
(2) Adding raw materials into a refining electric furnace: adding the raw materials weighed in the step (1) into a refining electric furnace through a furnace top bin of the refining electric furnace, and simultaneously adding 10 parts by mass of low-phosphorus low-carbon manganese-silicon alloy into the refining electric furnace for smelting, wherein the adding temperature of the low-phosphorus low-carbon manganese-silicon alloy is 1400-1500 ℃;
(3) Smelting: each furnace needs to continuously smelt for 2 to 3 hours from the addition of each raw material into the refining electric furnace to the discharge of the alloy, and after the melting period and the refining period, the melt in the furnace is in a liquid state at the temperature of 1500 to 1700 ℃; beginning 15 minutes before discharging, adding sodium bicarbonate into the refining electric furnace once every 5 minutes, wherein the mass of the sodium bicarbonate added in each time is 1.0 percent of the mass of the manganese ore added in the furnace, and generating CO 2 Protecting gas, reducing the contact between the alloy and air, and controlling the mass percentage of N in the low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese below 0.015 percent;
(4) Discharging the alloy to obtain a finished product of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese: through sampling detection, when the mass percentage of silicon in the alloy is 0.5-1.5%, the liquid alloy and the liquid slag are discharged from the refining electric furnace through a launder and flow into a ladle; then casting and finishing to obtain a low-nitrogen low-boron low-phosphorus low-carbon ferromanganese finished product; the boron content is ensured to be below 0.008 percent by controlling the temperature in the refining period of the furnace and the mass percent of silicon in the alloy to be 0.5 to 1.5 percent.
Through the matching and adjustment of the raw materials, most of phosphorus in the manganese ore enters the alloy in the smelting process, so the invention prevents the excessive addition of the manganese ore by reducing the addition proportion of the manganese ore, reduces the phosphorus brought by the manganese ore and further reduces the phosphorus increase of the alloy, and simultaneously properly increases the addition of lime to increase the slag alkalinity (CaO/SiO) 2 = 1.2-1.4) is beneficial to reaction and phosphorus reduction in the process of shaking a ladle; meanwhile, the low-phosphorus low-carbon manganese-silicon alloy subjected to phosphorus reduction by the shaking ladle is hot-blended into a refining electric furnace for smelting, the phosphorus content in the low-phosphorus low-carbon manganese-silicon alloy is further reduced by selecting raw materials, matching and adjusting the raw materials and using the shaking ladle, and the low-phosphorus low-carbon manganese-iron with the phosphorus content of less than 0.10 percent is produced by combining the raw materials, the raw materials and the shaking ladle.
Further, the low-phosphorus manganese ore contains 33-53% by mass of Mn, 0.02-0.05% by mass of P and 0.005-0.05% by mass of B;
the weight percentage content of CaO in the low-phosphorus lime is 85-94%, and the weight percentage content of P is 0.002-0.0035%;
in the low-phosphorus low-carbon manganese-silicon alloy, the mass percentage of Mn is 70-75%, the mass percentage of Si is 17-23%, the mass percentage of P is 0.04-0.08%, and the mass percentage of C is not more than 0.6%.
Further, the low-phosphorus low-carbon manganese-silicon alloy is prepared by the following production method: hot-blending low-manganese slag and the liquid low-carbon manganese-silicon alloy into a shaking ladle according to the mass ratio of 1.1-1.5, wherein the blending temperature of the liquid low-carbon manganese-silicon alloy is 1450-1550 ℃; and starting a shaking ladle, adjusting the rotation speed of the shaking ladle to be 30-45 r/min, and controlling the shaking ladle time to be 5-15 min to prepare the low-phosphorus low-carbon manganese-silicon alloy. Because the phosphorus content in the low manganese slag is very low, silicon in the low-carbon manganese-silicon alloy and oxides of manganese in the low manganese slag are subjected to oxidation-reduction reaction in the shaking ladle, the low-carbon manganese-silicon alloy is further subjected to phosphorus reduction treatment, the mass percentage content of the low-phosphorus low-carbon manganese-silicon alloy P prepared after shaking ladle is 0.04-0.08%, meanwhile, the silicon content is reduced, the manganese content is increased, and the control of the components of the refining electric furnace is facilitated.
Furthermore, the low-carbon manganese-silicon alloy contains 58-67% by mass of Mn, 23-32% by mass of Si, 0.05-0.09% by mass of P and not more than 0.6% by mass of C. The liquid low-carbon manganese-silicon alloy is produced by using an ore furnace, in the implementation process, manganese ores are matched and proportioned according to different contents of oxides of the manganese ores and are fed into the ore furnace for oxidation reduction reaction, a furnace eye is opened after smelting according to the power consumption, liquid furnace slag and the liquid low-carbon manganese-silicon alloy flow into a foundry ladle together, and the liquid low-carbon manganese-silicon alloy is subjected to slag separation, slag skimming and sedation, wherein the low-carbon manganese-silicon alloy is controlled to contain 58-67% by mass of Mn, 23-32% by mass of Si, 0.05-0.09% by mass of P and not more than 0.6% by mass of C. The low-carbon manganese-silicon alloy is produced according to the conventional production process in the field, and the detailed process is not described again.
Further, the low manganese slag is the liquid slag produced in the step (4).
Further, the mass percentage of Mn in the liquid slag is 17% -23%, and the mass percentage of SiO in the liquid slag is 2 27 to 32 percent of CaO, 33 to 40 percent of CaO and not more than 0.02 percent of P.
Further, the slag basicity is CaO/SiO 2 The temperature is controlled to be 1.2-1.4.
Further, in the step (4), the length of the launder is 800mm, the ladle is arranged below the launder outlet end, and the distance between the launder outlet end and the inlet of the ladle is 800mm; pouring the alloy into a pouring pool by a ladle within 3 minutes, pouring the alloy by covering slag (liquid alloy and liquid slag are simultaneously injected into an ingot mould, and the liquid slag floats on the ingot mould to form a slag cover), and controlling the pouring thickness of the slag to be more than 70 millimeters. By shortening the length of the launder and shortening the distance from the outlet end of the launder to the inlet of the ladle, the low-nitrogen, low-boron, low-phosphorus, low-carbon ferromanganese and the slag are mixed and quickly flow into the ladle, and meanwhile, by controlling the time of pouring into the pouring pool within 3 minutes, the pouring thickness of the slag is controlled to be more than 70 millimeters by adopting covering slag pouring for the alloy, the contact time of molten iron and nitrogen in the air is reduced, and the nitrogen content of the alloy is ensured to be less than 0.015 percent.
The invention has the advantages that: the production method can control the content of harmful elements such as nitrogen, boron and phosphorus in the low-carbon ferromanganese, and the mass percentage content of nitrogen in the produced low-carbon ferromanganese is less than 0.015 percent; the mass percentage of boron is less than 0.008%; the mass percentage of the phosphorus is less than 0.1 percent, and the low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese product produced by the invention can improve the performance of steel products and meet the requirements of smelting low-carbon manganese-containing special steel and military steel.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a production method of low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese in a first furnace.
FIG. 2 is a flow chart of the production method of the second furnace low-nitrogen low-boron low-phosphorus low-carbon ferromanganese.
FIG. 3 is a schematic view showing the positions of a launder and a ladle of a refining electric furnace.
A refining electric furnace 1, a launder 2 and a ladle 3.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
The refining electric furnace used in the embodiment is a 6.3MVA fixed refining electric furnace, and the annual capacity is 3.3 ten thousand tons.
The production method for producing the first furnace low-nitrogen low-boron low-phosphorus low-carbon ferromanganese comprises the following steps: (1) proportioning raw materials according to a raw material proportion; (2) adding the raw materials into a refining electric furnace; (3) smelting; (4) Discharging the alloy to obtain a finished product of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese; wherein,
(1) The raw materials are proportioned, and the raw materials are weighed according to the following parts by mass: 13-17 parts of low-phosphorus manganese ore, 8-12 parts of low-phosphorus lime and 10 parts of low-carbon manganese-silicon alloy. In the embodiment, 17t of low-phosphorus manganese ore, 11t of low-phosphorus lime and 10t of low-carbon manganese-silicon alloy.
Wherein the mass percent of Mn in the low-phosphorus manganese ore is 33-53%, the mass percent of P is 0.02-0.05%, and the mass percent of B is 0.005-0.05%; in the embodiment, the mass percent of Mn in the low-phosphorous manganese ore is 44%, the mass percent of P is 0.035%, and the mass percent of B is 0.011%;
the weight percentage content of CaO in the low-phosphorus lime is 85-94 percent, and the weight percentage content of P is 0.002-0.0035 percent; in the embodiment, the weight percentage of CaO in the low-phosphorus lime is 86.5 percent, and the weight percentage of P in the low-phosphorus lime is 0.0033 percent;
the low-carbon manganese-silicon alloy is produced by using an ore furnace, the implementation process comprises the steps of matching and proportioning manganese ores according to different contents of oxides of the manganese ores, sending the manganese ores into the ore furnace for oxidation reduction reaction, opening a furnace eye after smelting according to power consumption, enabling liquid slag and the liquid low-carbon manganese-silicon alloy to flow into a foundry ladle together, and carrying out slag separation, slag skimming and sedation on the liquid low-carbon manganese-silicon alloy, wherein the low-carbon manganese-silicon alloy is controlled to be 58-67% in terms of Mn, 23-32% in terms of Si, 0.05-0.09% in terms of P and not more than 0.6% in terms of C. Through detection, in the low-carbon manganese-silicon alloy used in the embodiment, the mass percentage of Mn is 60%, the mass percentage of Si is 29%, the mass percentage of P is 0.075%, and the mass percentage of C is 0.15%.
The low-carbon manganese-silicon alloy is produced according to the conventional production process in the field, and the detailed process is not repeated.
(2) Adding raw materials into a refining electric furnace: adding the raw materials weighed in the step (1) into a refining electric furnace for smelting through a furnace top bin of the refining electric furnace;
(3) Smelting: each furnace needs to continuously smelt for 2 to 3 hours from the time when all raw materials are added into the refining electric furnace to the time when the alloy is discharged from the furnace, the smelting time is 2.7 hours in the embodiment, the melting period and the refining period are passed, the temperature of the fusant in the furnace is 1500 to 1700 ℃, and in the embodiment, the temperature is controlled to be 1500 to 1700 ℃. Beginning 15 minutes before discharging, adding sodium bicarbonate into the refining electric furnace once every 5 minutes, wherein the mass of the sodium bicarbonate added in each time is 1.0 percent of the mass of the low-phosphorus manganese ore added in the furnace, and the adding amount is 170kg in the embodiment, and the sodium bicarbonate added in each time is used for generating CO 2 Protecting gas, reducing the contact between the alloy and air, and controlling the mass percentage of N in the low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese to be below 0.015 percent;
(4) Discharging the alloy to obtain a finished product of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese: through sampling detection, when the mass percentage of silicon in the alloy is 0.5-1.5%, the slag alkalinity is CaO/SiO 2 When the content is controlled to be 1.2-1.4, in the embodiment, the detected mass percentage content of silicon in the alloy is 1.35%, and the slag alkalinity is CaO/SiO 2 1.25, discharging the liquid alloy and the liquid slag from the refining electric furnace through a launder and flowing into a ladle; a part of liquid slag in the ladle provides low manganese slag required in a ladle shaking stage for the next furnace production, and the residual liquid slag and liquid alloy in the ladle are cast and finished to prepare a low-nitrogen low-boron low-phosphorus low-carbon ferromanganese finished product; pouring the alloy into a pouring pool by a ladle within 3 minutes, pouring the alloy by covering slag (the liquid alloy and the liquid slag are simultaneously injected into an ingot mould, the liquid slag floats on the ingot mould to form a slag cover), and controlling the pouring thickness of the slag to be more than 70 mm. The length a of the launder is 800mm, a ladle is arranged below the outlet end of the launder, and the distance b from the outlet end of the launder to the inlet of the ladle is 800mm;
in the finished product of the low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese prepared by the first furnace, the mass percentage content of nitrogen is 0.013 percent and is less than 0.015 percent through detection; the mass percentage of boron is 0.0075 percent and is less than 0.008 percent; the mass percentage of the phosphorus is 0.099 percent and less than 0.1 percent.
The production method for producing the low-nitrogen low-boron low-phosphorus low-carbon ferromanganese of the second furnace comprises the following steps: (1) proportioning raw materials according to a raw material proportion; (2) adding the raw materials into a refining electric furnace; (3) smelting; (4) Discharging the alloy to obtain a finished product of low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese; wherein,
(1) The raw materials are proportioned, and the raw materials are weighed according to the following parts by mass: 13-17 parts of low-phosphorus manganese ore and 8-12 parts of low-phosphorus lime; in the embodiment, 15t of low-phosphorus manganese ore and 8.5t of low-phosphorus lime.
Wherein, the mass percent of Mn in the low-phosphorus manganese ore is 33-53%, the mass percent of P is 0.02-0.05%, and the mass percent of B is 0.005-0.05%; in the embodiment, the mass percent of Mn in the low-phosphorus manganese ore is 42%, the mass percent of P is 0.032%, and the mass percent of B is 0.013%;
the weight percentage content of CaO in the low-phosphorus lime is 85-94 percent, and the weight percentage content of P is 0.002-0.0035 percent; in this embodiment, the mass percentage of CaO in the low-phosphorous lime is 88%, and the mass percentage of P is 0.0032%.
(2) Adding raw materials into a refining electric furnace: adding the raw materials weighed in the step (1) into a refining electric furnace through a furnace top bin of the refining electric furnace, and simultaneously adding 10 parts by mass of low-phosphorus low-carbon manganese-silicon alloy into the refining electric furnace for smelting, wherein in the embodiment, the adding mass of the low-phosphorus low-carbon manganese-silicon alloy is 10t, and the adding temperature of the low-phosphorus low-carbon manganese-silicon alloy is 1470 ℃;
in the embodiment, the low-phosphorus low-carbon manganese-silicon alloy is prepared by the following production method: taking the liquid slag produced by the first furnace as low manganese slag and liquid low-carbon manganese-silicon alloy, and adding the liquid slag and the liquid low-carbon manganese-silicon alloy into a shaking ladle in a mass ratio of 1.1; the adding temperature of the liquid low-carbon manganese-silicon alloy is 1480 ℃; and starting the shaking ladle, adjusting the rotation speed of the shaking ladle to be 30-45 r/min, and controlling the shaking ladle time to be 5-15 min to prepare the low-phosphorus low-carbon manganese-silicon alloy, wherein the rotation speed of the shaking ladle is 35r/min and the shaking ladle time is 7min. In the low-phosphorus low-carbon manganese-silicon alloy, the mass percent of Mn is 70-75%, the mass percent of Si is 17-23%, the mass percent of P is 0.04-0.08%, and the mass percent of C is not more than 0.6%. In the low-phosphorus low-carbon manganese-silicon alloy used in the embodiment, the mass percentage of Mn is 70%, the mass percentage of Si is 22%, the mass percentage of P is 0.061%, and the mass percentage of C is 0.1% through detection.
Because the phosphorus content in the low manganese slag is very low, silicon in the low-carbon manganese-silicon alloy and oxides of manganese in the low manganese slag are basically subjected to redox reaction in the shaking ladle, the low-carbon manganese-silicon alloy is subjected to further phosphorus reduction treatment, the mass percentage content of the low-phosphorus low-carbon manganese-silicon alloy P prepared after the shaking ladle is 0.04-0.08%, the silicon content is reduced, the manganese content is increased, and the control of the components of the refining electric furnace is facilitated.
The low-carbon manganese-silicon alloy is produced by using an ore furnace, the implementation process comprises the steps of carrying out matching and proportioning on manganese ores according to different contents of oxides of the manganese ores, sending the manganese ores into the ore furnace for oxidation reduction reaction, opening a furnace eye after smelting according to power consumption, enabling liquid slag and the liquid low-carbon manganese-silicon alloy to flow into a ladle together, and carrying out slag separation, slag skimming and sedation on the liquid low-carbon manganese-silicon alloy, wherein the low-carbon manganese-silicon alloy is controlled to be 58-67% in Mn weight percentage, 23-32% in Si weight percentage, 0.05-0.09% in P weight percentage and not more than 0.6% in C weight percentage. Through detection, the low-carbon manganese-silicon alloy used in the embodiment contains, by mass, 59.5% of Mn, 30% of Si, 0.07% of P, and 0.12% of C.
The low-carbon manganese-silicon alloy is produced according to the conventional production process in the field, and the detailed process is not described again.
The low manganese slag is liquid slag produced by the first furnace, and the liquid slag contains 18 percent of Mn and SiO by mass percent through detection 2 29 percent by mass, 36.3 percent by mass of CaO and 0.02 percent by mass of P.
(3) Smelting: each furnace needs to continuously smelt for 2-3 hours from the time when all raw materials are added into the refining electric furnace to the time when the alloy is discharged, the smelting time is 2.5 hours in the embodiment, the melting period and the refining period are passed, the melt in the furnace is in a liquid state in the refining period, the temperature is 1500-1700 ℃, and in the embodiment, the temperature is controlled at 1500-1700 ℃.
Beginning 15 minutes before discharging, adding sodium bicarbonate into the refining electric furnace once every 5 minutes, wherein the mass of the sodium bicarbonate added in each time is 1.0 percent of the mass of the manganese ore added in the furnace, and the sodium bicarbonate added in the embodiment is 3 times, and the adding amount in each time is 150kg, so as to generate CO 2 Protecting gas, reducing the contact between the alloy and air, and controlling the mass percentage of N in the low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese below 0.015 percent;
(4) Discharging the alloy to obtain a finished product of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese: through sampling detection, when the mass percentage of silicon in the alloy is 0.5-1.5%, the slag alkalinity is CaO/SiO 2 When the content is controlled to be 1.2-1.4, in the embodiment, the detected mass percentage content of silicon in the alloy is 1.1%, and the slag alkalinity is CaO/SiO 2 1.29, discharging the liquid alloy and the liquid slag from the refining electric furnace through a launder and flowing into a ladle; a part of liquid slag in the ladle provides low manganese slag required in a ladle shaking stage for the next furnace production, and the rest liquid slag and liquid alloy in the ladle are cast and finished to prepare a low-nitrogen low-boron low-phosphorus low-carbon ferromanganese finished product; pouring the alloy into a pouring pool by a ladle within 3 minutes, pouring the alloy by covering slag (the liquid alloy and the liquid slag are simultaneously injected into an ingot mould, the liquid slag floats on the ingot mould to form a slag cover), and controlling the pouring thickness of the slag to be more than 70 mm. Wherein the length a of the launder is 800mm, a ladle is arranged below the outlet end of the launder, and the distance b from the outlet end of the launder to the inlet of the ladle is 800mm;
in the finished product of the low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese prepared by the second furnace, the mass percentage content of nitrogen is 0.013 percent and is less than 0.015 percent through detection; the mass percentage of boron is 0.0076 percent and less than 0.008 percent; the mass percentage of the phosphorus is 0.098 percent and less than 0.1 percent.
The production method for producing the third furnace low-nitrogen low-boron low-phosphorus low-carbon ferromanganese comprises the following steps: (1) preparing materials according to the raw material proportion; (2) adding the raw materials into a refining electric furnace; (3) smelting; (4) Discharging the alloy to obtain a finished product of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese; wherein,
(1) The raw materials are proportioned, and the raw materials are weighed according to the following parts by mass: 13-17 parts of low-phosphorus manganese ore and 8-12 parts of low-phosphorus lime; in the embodiment, the low-phosphorus manganese ore is 14t, and the low-phosphorus lime is 8t.
Wherein, the mass percent of Mn in the low-phosphorus manganese ore is 33-53%, the mass percent of P is 0.02-0.05%, and the mass percent of B is 0.005-0.05%; in the embodiment, the mass percentage of Mn in the low-phosphorous manganese ore is 43%, the mass percentage of P is 0.034%, and the mass percentage of B is 0.012%;
the weight percentage content of CaO in the low-phosphorus lime is 85-94 percent, and the weight percentage content of P is 0.002-0.0035 percent; in the embodiment, the mass percentage of CaO in the low-phosphorus lime is 87%, and the mass percentage of P in the low-phosphorus lime is 0.0034%.
(2) Adding raw materials into a refining electric furnace: adding the raw materials weighed in the step (1) into a refining electric furnace through a furnace top bin of the refining electric furnace, and simultaneously adding 10 parts by mass of low-phosphorus low-carbon manganese-silicon alloy into the refining electric furnace for smelting, wherein in the embodiment, the adding mass of the low-phosphorus low-carbon manganese-silicon alloy is 10t, and the adding temperature of the low-phosphorus low-carbon manganese-silicon alloy is 1440 ℃;
in the embodiment, the low-phosphorus low-carbon manganese-silicon alloy is prepared by the following production method: taking the liquid slag produced by the second furnace as low manganese slag and liquid low-carbon manganese-silicon alloy, and adding the liquid slag and the liquid low-carbon manganese-silicon alloy into a shaking ladle in a mass ratio of 1.1; the adding temperature of the liquid low-carbon manganese-silicon alloy is 1455 ℃; and starting the shaking ladle, adjusting the rotation speed of the shaking ladle to be 30-45 r/min, and controlling the shaking ladle time to be 5-15 min to prepare the low-phosphorus low-carbon manganese-silicon alloy, wherein the rotation speed of the shaking ladle in the embodiment is 40r/min, and the shaking ladle time is controlled to be 13min. In the low-phosphorus low-carbon manganese-silicon alloy, the mass percent of Mn is 70-75%, the mass percent of Si is 17-23%, the mass percent of P is 0.04-0.08%, and the mass percent of C is not more than 0.6%. In the low-phosphorus low-carbon manganese-silicon alloy prepared by the embodiment, the mass percentage of Mn is 72%, the mass percentage of Si is 20%, the mass percentage of P is 0.06%, and the mass percentage of C is 0.19% through detection.
Because the phosphorus content in the low manganese slag is very low, silicon in the low-carbon manganese-silicon alloy and oxides of manganese in the low manganese slag are subjected to oxidation-reduction reaction in the shaking ladle, the low-carbon manganese-silicon alloy is further subjected to phosphorus reduction treatment, the mass percentage content of the low-phosphorus low-carbon manganese-silicon alloy P prepared after shaking ladle is 0.04-0.08%, meanwhile, the silicon content is reduced, the manganese content is increased, and the control of the components of the refining electric furnace is facilitated.
The low-carbon manganese-silicon alloy is produced by using an ore furnace, the implementation process comprises the steps of matching and proportioning manganese ores according to different contents of oxides of the manganese ores, sending the manganese ores into the ore furnace for oxidation reduction reaction, opening a furnace eye after smelting according to power consumption, enabling liquid slag and the liquid low-carbon manganese-silicon alloy to flow into a foundry ladle together, and carrying out slag separation, slag skimming and sedation on the liquid low-carbon manganese-silicon alloy, wherein the low-carbon manganese-silicon alloy is controlled to be 58-67% in terms of Mn, 23-32% in terms of Si, 0.05-0.09% in terms of P and not more than 0.6% in terms of C. Through detection, the low-carbon manganese-silicon alloy used in the embodiment contains 62% by mass of Mn, 27% by mass of Si, 0.065% by mass of P and 0.2% by mass of C.
The low-carbon manganese-silicon alloy is produced according to the conventional production process in the field, and the detailed process is not described again.
The low manganese slag is liquid slag produced by the second furnace, and the liquid slag contains 20% of Mn and SiO by mass percent through detection 2 30 percent of CaO, 38.7 percent of CaO and 0.02 percent of P.
(3) Smelting: each furnace needs to continuously smelt for 2 to 3 hours from the time when all raw materials are added into the refining electric furnace to the time when the alloy is discharged from the furnace, the smelt time is 2.3 hours in the embodiment, the melt in the furnace is in a liquid state in the refining period and the temperature is 1500 to 1700 ℃ in the embodiment, and the temperature is controlled to be 1500 to 1700 ℃.
Adding sodium bicarbonate into the refining electric furnace at intervals of 5 minutes from 15 minutes before dischargingThe addition amount of sodium bicarbonate is 1.0% of the charging amount of manganese ore, and the addition amount is 140kg for 3 times in this example to generate CO 2 Protecting gas, reducing the contact between the alloy and air, and controlling the mass percentage of N in the low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese below 0.015 percent;
(4) Discharging the alloy to obtain a finished product of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese: through sampling detection, when the mass percentage content of silicon in the alloy is 0.5-1.5%, the slag alkalinity is CaO/SiO 2 When the content is controlled to be 1.2-1.4, in the embodiment, the detected mass percentage content of silicon in the alloy is 0.85%, and the slag alkalinity is CaO/SiO 2 1.32, discharging the liquid alloy and the liquid slag from the refining electric furnace through a launder and flowing into a ladle; a part of liquid slag in the ladle provides low manganese slag required in a ladle shaking stage for the next furnace production, and the residual liquid slag and liquid alloy in the ladle are cast and finished to prepare a low-nitrogen low-boron low-phosphorus low-carbon ferromanganese finished product; pouring the alloy into a pouring pool by a ladle within 3 minutes, pouring the alloy by covering slag (the liquid alloy and the liquid slag are simultaneously injected into an ingot mould, the liquid slag floats on the ingot mould to form a slag cover), and controlling the pouring thickness of the slag to be more than 70 mm. The length a of the launder is 800mm, the ladle is arranged below the outlet end of the launder, and the distance b from the outlet end of the launder to the inlet of the ladle is 800mm;
in the finished product of the low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese prepared by the third furnace, the mass percentage content of nitrogen is 0.013 percent and is less than 0.015 percent through detection; the mass percentage of boron is 0.0075 percent and less than 0.008 percent; the mass percentage of the phosphorus is 0.096 percent and less than 0.1 percent.
The production method for producing the fourth furnace low-nitrogen low-boron low-phosphorus low-carbon ferromanganese comprises the following steps: (1) proportioning raw materials according to a raw material proportion; (2) adding the raw materials into a refining electric furnace; (3) smelting; (4) Discharging the alloy to obtain a finished product of low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese; wherein,
(1) The raw materials are proportioned, and the raw materials are weighed according to the following parts by mass: 13-17 parts of low-phosphorus manganese ore and 8-12 parts of low-phosphorus lime; in the embodiment, 13t of low-phosphorus manganese ore and 8t of low-phosphorus lime.
Wherein, the mass percent of Mn in the low-phosphorus manganese ore is 33-53%, the mass percent of P is 0.02-0.05%, and the mass percent of B is 0.005-0.05%; in the embodiment, the mass percentage of Mn in the low-phosphorous manganese ore is 46%, the mass percentage of P is 0.03%, and the mass percentage of B is 0.009%;
the weight percentage content of CaO in the low-phosphorus lime is 85-94 percent, and the weight percentage content of P is 0.002-0.0035 percent; in this example, the mass percentage of CaO in the low-phosphorous lime is 86%, and the mass percentage of P is 0.003%.
(2) Adding raw materials into a refining electric furnace: adding the raw materials weighed in the step (1) into a refining electric furnace through a furnace top bin of the refining electric furnace, and simultaneously adding 10 parts by mass of low-phosphorus low-carbon manganese-silicon alloy into the refining electric furnace for smelting, wherein in the embodiment, the adding mass of the low-phosphorus low-carbon manganese-silicon alloy is 10t, and the adding temperature of the low-phosphorus low-carbon manganese-silicon alloy is 1420 ℃;
in the embodiment, the low-phosphorus low-carbon manganese-silicon alloy is prepared by the following production method: taking the liquid slag produced by the third furnace as low manganese slag and liquid low-carbon manganese-silicon alloy, and adding the liquid slag and the liquid low-carbon manganese-silicon alloy into a shaking ladle in a mass ratio of 1.1; the adding temperature of the liquid low-carbon manganese-silicon alloy is 1450 ℃; and starting the shaking ladle, adjusting the rotation speed of the shaking ladle to be 30-45 r/min, and controlling the shaking ladle time to be 5-15 min to prepare the low-phosphorus low-carbon manganese-silicon alloy, wherein the rotation speed of the shaking ladle in the embodiment is 43r/min, and the shaking ladle time is controlled to be 10min. In the low-phosphorus low-carbon manganese-silicon alloy, the mass percent of Mn is 70-75%, the mass percent of Si is 17-23%, the mass percent of P is 0.04-0.08%, and the mass percent of C is not more than 0.6%. In the low-phosphorus low-carbon manganese-silicon alloy prepared by the embodiment, the mass percentage of Mn is 72%, the mass percentage of Si is 19%, the mass percentage of P is 0.065%, and the mass percentage of C is 0.43%.
Because the phosphorus content in the low manganese slag is very low, silicon in the low-carbon manganese-silicon alloy and oxides of manganese in the low manganese slag are basically subjected to redox reaction in the shaking ladle, the low-carbon manganese-silicon alloy is subjected to further phosphorus reduction treatment, the mass percentage content of the low-phosphorus low-carbon manganese-silicon alloy P prepared after the shaking ladle is 0.04-0.08%, the silicon content is reduced, the manganese content is increased, and the control of the components of the refining electric furnace is facilitated.
The low-carbon manganese-silicon alloy is produced by using an ore furnace, the implementation process comprises the steps of carrying out matching and proportioning on manganese ores according to different contents of oxides of the manganese ores, sending the manganese ores into the ore furnace for oxidation reduction reaction, opening a furnace eye after smelting according to power consumption, enabling liquid slag and the liquid low-carbon manganese-silicon alloy to flow into a ladle together, and carrying out slag separation, slag skimming and sedation on the liquid low-carbon manganese-silicon alloy, wherein the low-carbon manganese-silicon alloy is controlled to be 58-67% in Mn weight percentage, 23-32% in Si weight percentage, 0.05-0.09% in P weight percentage and not more than 0.6% in C weight percentage. Through detection, the low-carbon manganese-silicon alloy used in the embodiment contains 65 mass percent of Mn, 24 mass percent of Si, 0.07 mass percent of P and 0.45 mass percent of C.
The low-carbon manganese-silicon alloy is produced according to the conventional production process in the field, and the detailed process is not described again.
The low manganese slag is liquid slag produced by the third furnace, and the liquid slag contains 22 percent by mass of Mn and SiO through detection 2 29 percent by mass, 38.3 percent by mass of CaO and 0.02 percent by mass of P.
(3) Smelting: each furnace needs to continuously smelt for 2 to 3 hours from the time when all raw materials are added into the refining electric furnace to the time when the alloy is discharged from the furnace, the smelting time is 2 hours in the embodiment, the melting period and the refining period pass, the melt in the furnace is in a liquid state during the refining period, the temperature is 1500 to 1700 ℃, and in the embodiment, the temperature is controlled to be 1500 to 1700 ℃.
Beginning 15 minutes before discharging, adding sodium bicarbonate into the refining electric furnace once every 5 minutes, wherein the mass of the sodium bicarbonate added in each time is 1.0 percent of the mass of the manganese ore added in the furnace, and the adding amount is 130kg for 3 times in the embodiment, so as to generate CO 2 Protecting gas, reducing the contact between the alloy and air, and controlling the mass percentage of N in the low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese below 0.015 percent;
(4) Discharging the alloy to obtain a finished product of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese: through sampling detection, when the mass percentage of silicon in the alloy is 0.5-1.5%, the slag alkalinity is CaO/SiO 2 When the content is controlled to be 1.2-1.4, in the embodiment, the detected mass percentage content of silicon in the alloy is 0.6%, and the slag alkalinity is CaO/SiO 2 1.35, discharging the liquid alloy and the liquid slag from the refining electric furnace through a launder and flowing into a ladle; a part of liquid slag in the ladle provides low manganese slag required in a ladle shaking stage for the next furnace production, and the residual liquid slag and liquid alloy in the ladle are cast and finished to prepare a low-nitrogen low-boron low-phosphorus low-carbon ferromanganese finished product; pouring the alloy into a pouring pool by a ladle within 3 minutes, pouring the alloy by covering slag (the liquid alloy and the liquid slag are simultaneously injected into an ingot mould, the liquid slag floats on the ingot mould to form a slag cover), and controlling the pouring thickness of the slag to be more than 70 mm. The length a of the launder is 800mm, the ladle is arranged below the outlet end of the launder, and the distance b from the outlet end of the launder to the inlet of the ladle is 800mm;
in the finished product of the low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese prepared by the fourth furnace, the mass percentage content of nitrogen is 0.013 percent and is less than 0.015 percent through detection; the mass percentage of boron is 0.0075 percent and less than 0.008 percent; the mass percentage of the phosphorus is 0.093 percent and less than 0.1 percent.
In the embodiment, the length of the launder is shortened, the length of the launder outlet end is shortened at the same time, the distance between the outlet end of the launder and the inlet of the ladle is shortened, the low-nitrogen, low-boron, low-phosphorus, low-carbon ferromanganese and the slag are mixed and quickly flow into the ladle, the time of pouring into the pouring pool is controlled within 3 minutes, the pouring thickness of the slag is controlled to be more than 70 millimeters by adopting cover slag pouring for the alloy, the contact time of the molten iron and nitrogen in the air is reduced, and the nitrogen content of the alloy is ensured to be less than 0.015 percent.
The mass percentage of boron is ensured to be below 0.008 percent by controlling the temperature in the refining period of the furnace and the mass percentage of silicon in the alloy to be 0.5 to 1.5 percent.
Since most of the phosphorus in the manganese ore enters the alloy during the smelting process, the proportion of each raw material is adjusted, and the manganese is reducedThe ore addition proportion prevents the excessive addition of manganese ore, reduces the phosphorus brought by the manganese ore and further reduces the phosphorus increase of the alloy, and simultaneously properly increases the lime addition and increases the slag alkalinity (CaO/SiO) 2 = 1.2-1.4) is beneficial to the reaction and phosphorus reduction in the process of shaking the ladle; meanwhile, the low-phosphorus low-carbon manganese-silicon alloy subjected to phosphorus reduction by the shaking ladle is hot-blended into a refining electric furnace for smelting, the phosphorus content in the low-phosphorus low-carbon manganese-silicon alloy is further reduced by selecting raw materials, matching and adjusting the raw materials and using the shaking ladle, and the low-phosphorus low-carbon manganese-iron with the phosphorus content of less than 0.10 percent is produced by combining the raw materials, the raw materials and the shaking ladle.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (6)
1. A production method of low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese is characterized by comprising the following steps: (1) preparing materials according to the raw material proportion; (2) adding the raw materials into a refining electric furnace; (3) smelting; (4) Discharging the alloy to obtain a finished product of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese; wherein,
(1) The raw materials are proportioned according to the following mass portions: 13-17 parts of low-phosphorus manganese ore and 8-12 parts of low-phosphorus lime; the mass percent of Mn in the low-phosphorus manganese ore is 33-53%, the mass percent of P is 0.02-0.05%, and the mass percent of B is 0.005-0.05%; the weight percentage content of CaO in the low-phosphorus lime is 85-94%, and the weight percentage content of P is 0.002-0.0035%;
(2) Adding raw materials into a refining electric furnace: adding the raw materials weighed in the step (1) into a refining electric furnace through a furnace top bin of the refining electric furnace, and simultaneously adding 10 parts by mass of low-phosphorus low-carbon manganese-silicon alloy into the refining electric furnace for smelting, wherein the adding temperature of the low-phosphorus low-carbon manganese-silicon alloy is 1400-1500 ℃; in the low-phosphorus low-carbon manganese-silicon alloy, the mass percentage of Mn is 70-75%, the mass percentage of Si is 17-23%, the mass percentage of P is 0.04-0.08%, and the mass percentage of C is not more than 0.6%;
(3) Smelting: each furnace needs to continuously smelt for 2 to 3 hours from the addition of each raw material into the refining electric furnace to the discharge of the alloy, and after the melting period and the refining period, the melt in the furnace is in a liquid state at the temperature of 1500 to 1700 ℃; beginning 15 minutes before discharging, adding sodium bicarbonate into the refining electric furnace once every 5 minutes, wherein the mass of the added sodium bicarbonate is 1.0 percent of the mass of the manganese ore charged into the furnace each time;
(4) Discharging the alloy to obtain a finished product of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese: through sampling detection, when the mass percentage of silicon in the alloy is 0.5-1.5%, the liquid alloy and the liquid slag are discharged from the refining electric furnace through a launder and flow into a ladle; the length of the launder is 800mm, the ladle is arranged below the outlet end of the launder, and the distance between the outlet end of the launder and the inlet of the ladle is 800mm; pouring the alloy into a pouring pool from a ladle within 3 minutes, pouring the alloy by covering slag, and controlling the pouring thickness of the slag to be more than 70 millimeters; then casting and finishing to obtain a finished product of low-nitrogen low-boron low-phosphorus low-carbon ferromanganese; the mass percentage of nitrogen in the low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese is less than 0.015 percent; the mass percentage of boron is less than 0.008%; the mass percentage of the phosphorus is less than 0.1 percent.
2. The method for producing the low-nitrogen low-boron low-phosphorus low-carbon ferromanganese according to claim 1, wherein the low-phosphorus low-carbon ferromanganese is prepared by the following production method: hot-blending low-manganese slag and liquid low-carbon manganese-silicon alloy into a shaking ladle according to the mass ratio of 1.1-1.5, wherein the blending temperature of the liquid low-carbon manganese-silicon alloy is 1450-1550 ℃; starting the shaking ladle, adjusting the rotation speed of the shaking ladle to be 30-45 r/min, and controlling the shaking ladle time to be 5-15 min to prepare the low-phosphorus low-carbon manganese-silicon alloy.
3. The method for producing the low-nitrogen low-boron low-phosphorus low-carbon ferromanganese as claimed in claim 2, wherein the low-carbon manganese-silicon alloy contains 58-67% by mass of Mn, 23-32% by mass of Si, 0.05-0.09% by mass of P, and not more than 0.6% by mass of C.
4. The method for producing low-nitrogen, low-boron, low-phosphorus and low-carbon ferromanganese as claimed in claim 2, wherein the low-manganese slag is the liquid slag produced in the step (4).
5. The method for producing the low-nitrogen low-boron low-phosphorus low-carbon ferromanganese according to claim 4, wherein the mass percentage of Mn in the liquid slag is 17-23%, and the mass percentage of SiO in the liquid slag is 17-23% 2 27 to 32 percent of CaO, 33 to 40 percent of CaO and not more than 0.02 percent of P.
6. The method for producing low-nitrogen, low-boron, low-phosphorus, low-carbon ferromanganese according to claim 1, wherein the liquid slag basicity is CaO/SiO 2 The temperature is controlled to be 1.2-1.4.
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