CN114854930A - Cold slag slagging agent for converter steelmaking and use method thereof - Google Patents
Cold slag slagging agent for converter steelmaking and use method thereof Download PDFInfo
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- CN114854930A CN114854930A CN202210514657.4A CN202210514657A CN114854930A CN 114854930 A CN114854930 A CN 114854930A CN 202210514657 A CN202210514657 A CN 202210514657A CN 114854930 A CN114854930 A CN 114854930A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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Abstract
The invention relates to a cold slag slagging agent for converter steelmaking and a use method thereof, wherein the cold slag slagging agent comprises the following raw materials in parts by weight: cooling slag in a converter: 1000-2500 parts; smelting metal ash: 1350 and 1650 parts; limestone: 100-300 parts; dolomite: 700 and 850 parts. The invention utilizes the converter cold slag as a slagging agent to carry out steel smelting, thereby realizing the recycling of the converter cold slag.
Description
Technical Field
The invention relates to the technical field of steelmaking, in particular to a cold slag slagging agent for converter steelmaking and a use method thereof.
Background
In the traditional slagging process, because the melting point of silicate in the slag is more than or equal to 1700 ℃, in order to increase the melting speed of the slag, a certain amount of FeO in the slag system is required to serve as a solvent, the content is generally controlled to be 18-25%, the slagging time is more than or equal to 3min, but the FeO in the slag can not be effectively recovered, and the serious iron loss is caused. Meanwhile, due to the characteristics of large volume, large granularity, easy pulverization and the like, the cold slag of the converter cannot be effectively recycled at present, so that economic loss is caused.
Therefore, it is very important to develop a converter steelmaking slag former and a using method thereof, which can utilize converter cold slag as a slag former to carry out steel smelting and realize recycling of wastes.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a cold slag slagging agent for converter steelmaking and a using method thereof, which can utilize converter cold slag as the slagging agent to carry out steel smelting and realize the recycling of the converter cold slag.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the first technical scheme is as follows:
a cold slag slagging agent for converter steelmaking comprises the following raw materials in parts by weight:
further, the alkalinity of the converter cold slag is 2.9-3.5, and the converter cold slag comprises 18-25% of FeO by mass.
Further, the converter cold slag also comprises the following raw materials in percentage by weight:
furthermore, the particle size of the converter cold slag is 40-70 mm.
Further, the converter cold slag is obtained by cooling slag discharged from converter steelmaking.
The second technical scheme is as follows:
a use method of a cold slag slagging agent for converter steelmaking is provided, which is used for steel smelting.
Further, the mass ratio of the steel material to the slag former in the steel smelting process is 13400-13500: 315-525.
Further, the steel smelting process comprises the following steps:
charging steel material and converter cold slag into a converter, wherein the early stage is 150-200mm higher than a carbon drawing gun position, the oxygen pressure is 8.5-9.0Mpa, and the oxygen flow is 14000m 3 And h, adding metallurgical ash accounting for 60-65% of the total weight of the metallurgical ash, limestone and dolomite, melting the molten slag completely when oxygen supply is carried out for 1.8-2.6min, overflowing molten-state metallurgical slag from a furnace mouth, taking a slag sample, and measuring the alkalinity R: 1.8-2.2, starting carbon flame 3-4min after blowing, adding residual metallurgical ash, slightly drying again, wherein the drying time is 35-60s, descending the gun to 150mm above the carbon drawing gun position in 9.5-10.5min, descending the gun to the carbon drawing gun position in 11min, drawing carbon for 45s, no splashing in the process, no slag during end point tapping, and end point slag alkalinity R: 2.5-3.5, end temperature 1627-.
Compared with the prior art, the invention has the following beneficial effects:
the invention utilizes the converter cold slag as the slag former to carry out steel smelting, thereby not only realizing the recycling of the converter cold slag, but also improving the steel smelting process and saving the steel smelting cost and the waste treatment cost of the solid waste treatment of the converter cold slag.
Detailed Description
The present invention will be described in detail with reference to examples below, wherein Q235 is a steel grade for smelting, and the composition is defined as (C: 0.12-0.22%; Si: 0.12-0.3%; Mn: 0.30-0.70%; P. ltoreq.0.045%, S. ltoreq.0.045%).
Example 1
A cold slag slagging constituent for converter steelmaking comprises the following raw materials by weight:
the converter cold slag is obtained by cooling slag discharged by converter steelmaking;
the alkalinity of the converter cold slag is 3.14, and the granularity is 40-70 mm; the converter cold slag comprises the following components in percentage by weight:
a use method of a cold slag slagging agent for converter steelmaking is provided, which is used for steel smelting;
the steel smelting process comprises the following steps: charging 134.7t steel material and 1000kg slag former, starting oxygen at the earlier stage 200mm higher than the carbon drawing gun position, oxygen pressure 8.5Mpa, oxygen flow 14000m 3 Adding 1200kg of metallurgical ash, 300kg of limestone and 850kg of dolomite into the mixture, and melting the mixture when oxygen supply is carried out for 2.56minCompletely melting slag, overflowing molten metallurgical slag from a furnace mouth, taking a slag sample, and measuring the alkalinity R: 1.81, carbon flame is started about 3.5min after blowing, metallurgical ash 450kg is added, when 8.5min, slight drying is appeared, the drying time is 57s, 150mm is dropped to the position of a carbon drawing gun when 9.5min, the gun is dropped to the position of the carbon drawing gun when 11min, the carbon drawing time is 45s, the process has no splashing, the end point tapping amount is 126.4t, the tapping is not carried out, the end point slag alkalinity R: 2.6, the end point temperature is 1634 ℃, and the molten steel comprises the following components: 0.11 percent of C; p: 0.013%, S: 0.014%, the product meets the specified requirement of steel grade Q235, and the consumption of steel materials is calculated to be 1065.6kg/t steel.
Example 2
A cold slag slagging constituent for converter steelmaking comprises the following raw materials by weight:
the converter cold slag is obtained by cooling slag discharged by converter steelmaking;
the alkalinity of the converter cold slag is 2.87, and the granularity is 40-70 mm; the converter cold slag comprises the following components in percentage by weight:
a use method of a cold slag slagging agent for converter steelmaking is provided, which is used for steel smelting;
the steel smelting process comprises the following steps: charging 134.5t steel material and 2000kg slag former, the former stage is 150mm higher than the carbon drawing gun position, oxygen pressure is 8.5Mpa, oxygen flow is 14000m 3 Adding 1000kg of metallurgical ash, 200kg of limestone and 760kg of dolomite, melting the molten slag completely when oxygen supply is carried out for 2.1min, overflowing the molten metallurgical slag from a furnace mouth, taking a slag sample and measuring the alkalinity R: 2.01, beginning carbon flame about 3.5min after blowing, adding 400kg of metallurgical ash, slightly drying again when 9min, wherein the drying time is 44s, descending the gun to 150mm above the carbon drawing gun position when 10min, descending the gun to the carbon drawing gun position when 11min, and the carbon drawing time is 45s, no splashing exists in the process, the end point steel tapping amount is 127.3t, and tappingAnd (3) no slag, end-point slag alkalinity R: 2.8, the end point temperature is 1631 ℃, and the molten steel comprises the following components: 0.12 percent of C; p: 0.011%, S: 0.016 percent, the product meets the specified requirement of steel grade Q235, and the steel material consumption is calculated to be 1056.6kg/t steel.
Example 3
A cold slag slagging constituent for converter steelmaking comprises the following raw materials by weight:
converter cold slag is adopted, and the converter cold slag is obtained by cooling slag discharged by converter steelmaking;
the alkalinity of the converter cold slag is 3.11, and the granularity is 40-70 mm; the converter cold slag comprises the following components in percentage by weight:
a use method of a cold slag slagging agent for converter steelmaking comprises the steps of smelting steel by using the slagging agent;
the steel smelting process comprises the following steps: charging 134.3t steel material and 3000kg slag former, the former stage is 150mm higher than the carbon drawing gun position, oxygen pressure is 9.0Mpa, oxygen flow is 14000m 3 Adding 1000kg of metallurgical ash, 100kg of limestone and 700kg of dolomite, completely melting the molten slag when oxygen is supplied for 1.89min, overflowing the molten metallurgical slag from a furnace mouth, taking a slag sample, measuring the alkalinity R: 2.13, carbon flame is the first when about 3min after blowing, adds metallurgical ash 350kg, and when 9.6min, appear slightly returning to doing, it is long 35s to return to doing, and the rifle position promotes 100mm slagging scorification, falls the rifle 150mm to drawing carbon rifle position during 10.5min, falls the rifle to drawing carbon rifle position during 11min, draws carbon time 45s, and the process does not have the splash, and terminal point tapping amount 126.4t, and the tapping is not the sediment, terminal point sediment basicity R: 3.1, end point temperature 1627 ℃, molten steel composition as follows: 0.11 percent of C; p: 0.012%, S: 0.015 percent, the product meets the specified requirement of steel grade Q235, and the consumption of steel materials is calculated to be 1062.5kg/t steel.
Comparative example 1
A slagging agent for converter steelmaking comprises the following raw materials by weight:
2000kg of metallurgical ash;
500kg of limestone;
1000kg of dolomite.
A using method of a slagging agent for converter steelmaking comprises the steps of smelting steel by using the slagging agent;
the steel smelting process comprises the following steps: charging 134.9t steel material, blowing at 300mm earlier than the carbon drawing gun position, oxygen pressure of 9.0Mpa, oxygen flow of 14000m 3 Adding 1600kg of metallurgical ash, 500kg of limestone and 1000kg of dolomite into the mixture per hour, lowering the gun by 100mm later, completely melting the slag when supplying oxygen for 3.1min, sampling and testing the alkalinity of the slag R: 1.83, adding 400kg of metallurgical dust after the carbon flame is started at the beginning of 3.8min, drying back appears in 7.5min, the drying back time is 62s, the gun position is lifted by 150mm, the gun is lowered by 200mm in 10min, the gun is lowered to the carbon pulling gun position in 11min, the carbon pulling time is 45s, the process has no splashing, the end point steel output is 126.0t, the steel is not discharged, and the end point slag alkalinity R: 2.5, end point temperature 1653 ℃, molten steel components as follows: 0.13 percent of C; p: 0.021%, S: 0.011 percent, the product meets the specified requirement of steel grade Q235, and the consumption of the steel material is calculated to be 1070.3kg/t steel.
Comparative example 2
The slag former for converter steelmaking comprises the following raw materials in parts by weight:
2000kg of metallurgical ash;
500kg of limestone;
1000kg of dolomite.
A using method of a slagging agent for converter steelmaking comprises the steps of smelting steel by using the slagging agent;
the steel smelting process comprises the following steps: charging 134.5t steel material, blowing at the early stage 200mm higher than the carbon drawing gun position, oxygen pressure of 8.5Mpa, oxygen flow of 14000m 3 Adding 1600kg of metallurgical ash, 500kg of limestone and 1000kg of dolomite into the mixture per hour, lowering the gun to 150mm later, completely melting the molten slag when supplying oxygen for 2.9min, sampling and testing the alkalinity of the molten slag R: 1.82, adding 400kg of metallurgical ash after the carbon flame is started at 4.0min, and drying again after 8.2minThe drying time is 57s, the gun position is lifted by 200mm, the gun is lowered by 250mm in 10min, the gun is lowered to the carbon pulling gun position in 11min, the carbon pulling time is 45s, the process has no splashing, the end point tapping amount is 125.8t, the tapping is not carried out, and the end point slag alkalinity R: 2.1, end point temperature 1651 ℃, molten steel components as follows: 0.15 percent of C; p: 0.019%, S: 0.012 percent, the product meets the specified requirement of steel grade Q235, and the consumption of steel materials is calculated to be 1069.2kg/t steel.
Comparative example 3
A slagging agent for converter steelmaking comprises the following raw materials by weight:
2150kg of metallurgical ash;
400kg of limestone;
1200kg of dolomite.
A using method of a slagging agent for converter steelmaking comprises the steps of smelting steel by using the slagging agent;
the steel smelting process comprises the following steps: charging 134.4t steel material, blowing at 300mm earlier than the carbon drawing gun position, oxygen pressure of 9.0Mpa, oxygen flow of 14000m 3 Adding 1700kg of metallurgical ash, 400kg of limestone and 1200kg of dolomite into the mixture, lowering the gun by 200mm, completely melting the slag when supplying oxygen for 3.3min, sampling and testing the alkalinity R of the slag: 1.75, adding 450kg of metallurgical ash after the carbon flame is started at the beginning when the temperature is 4.2min, drying back appears when the temperature is 7.8min, the drying back time is 60s, the gun position is lifted by 300mm, the gun is lowered by 300mm when the temperature is 10min, the gun is lowered to the carbon pulling gun position when the temperature is 11min, the carbon pulling time is 45s, the process has no splashing, the end point steel output is 125.6t, the steel is not discharged, and the end point slag alkalinity R: 2.4, end point temperature 1655 ℃, molten steel components as follows: 0.11 percent of C; p: 0.022%, S: 0.011 percent, the product meets the specified requirement of steel grade Q235, and the consumption of the steel material is calculated to be 1069.8kg/t steel.
Effect example 1
The indexes in the examples and comparative examples are summarized, and the C, P, S content in the molten steel at the end point is measured, and the results are shown in tables 1 to 3.
Table 1 burden matching difference between each example and comparative example
TABLE 2 tracking and comparison of various indexes in the iron and steel smelting process
TABLE 3 end point parameters and molten steel indices at the end point of each of examples and comparative examples
From the data in the table above, it can be seen that:
(1) from the data comparison in table 1, it can be seen that: in the case of equivalent charging amount, the average amount of the metallurgical ashes of examples 1 to 3 using the cold slag was 1467 kg. furnace in total in the smelting process -1 The average dosage of limestone is 200 kg-furnace -1 The average dosage of dolomite is 770kg per furnace -1 (ii) a Comparative examples 1 to 3 in which cold slag was not used, the average amount of metallurgical dust used was 2050 kg-furnace -1 The average dosage of limestone is 467kg & furnace -1 The average dosage of dolomite is 1067 kg-furnace -1 Compared with the comparative example without cold slag, the usage amount of metallurgical ash in the smelting process using the cold slag is reduced by 583kg furnace on average -1 Average reduction of limestone consumption 267kg furnace -1 The average consumption of dolomite is reduced by 297kg furnace -1 The invention realizes the recycling of the cold slag of the converter, greatly saves the consumption of metallurgical ash, limestone and dolomite and saves the cost.
(2) From the data comparison in table 2, it is clear that: 1) due to the high alkalinity of the cold slag, the average value of the early alkalinity of the converter smelting is 1.98 after the cold slag is used in the examples 1 to 3, and the average value of the early alkalinity of the comparative examples 1 to 3 without the cold slag is 1.80; after the cold slag is used, the early alkalinity is increased by 0.18 compared with that when the cold slag is not used; 2) since the cold slag contains about 20% of FeO, the early slagging time is also greatly shortened, and the comparison of the data of the examples 1 to 3 shows that: the larger the amount of the cold slag, the shorter the slag melting time; wherein the mean value of the slagging time of examples 1 to 3 is 2.18min, while the mean value of the slagging time of comparative examples 1 to 3 is 3.1 min; compared with comparative examples 1-3 without the cold slag, the slag melting time of examples 1-3 using the cold slag is averagely shortened by 0.92 min; 3) no significant splashing was seen during the middle period for examples 1-3 and comparative examples 1-3; 4) while the average dry return time of examples 1 to 3 was 45s, the average dry return time of comparative examples 1 to 3 was 60s, the average dry return time of examples 1 to 3 was reduced by 15s compared to the comparative example without using cold slag due to the higher FeO content in the cold slag. Therefore, in the whole smelting process, after the cold slag is used, the production requirement is met, and the smelting process is improved to a certain extent.
(3) From the comparison of the data in table 3, it can be seen that: 1) by comparing the end point conditions, the alkalinity R of the final slag of the examples 1 to 3 in which the cold slag is used for slagging is obviously higher than that of the comparative examples 1 to 3 in which the cold slag is not used, and the main reasons for analysis are as follows: when the cold slag is used, the melting speed of the slag in the furnace is higher and sufficient, so that the utilization rate of the solvent material is improved; 2) the end point temperature T is favorable for controlling the tapping temperature of the converter in a high iron loss mode because the cooling coefficient of the cold slag is 1.0; 3) comparing the end point components, the slag melting speed is accelerated in the early stage, the alkalinity is increased, the oxygen potential environment between the liquid levels of the steel slag is improved, the dephosphorization rate of the embodiment 1-3 using the cold slag heat is increased by about 6.0% [ the P content of the molten iron is 0.150%, and the calculation formula is as follows: the dephosphorization rate is (molten iron phosphorus-molten steel phosphorus)/molten iron phosphorus; the mean values of P contents of examples 1 to 3 were 0.012 and those of comparative examples 1 to 3 were 0.021 ], 4) the desulfurization rates of examples 1 to 3 were decreased as compared with those of comparative examples 1 to 3, and the reasons for analyzing were mainly: the sulfur content in the cold slag is higher, so that the desulfurization rate is reduced, but the cold slag can still meet the smelting requirements of common steel grades such as Q235; 5) in general, in the smelting process, the consumption of the steel materials accounts for 80% of the cost of iron to steel, but from the use effect of the cold slag, the invention carries out slagging in advance, shortens the later period of drying time, prolongs the end point carbon pressure gun pulling time, reduces iron oxide in the slag, and compared with a comparative example which does not use the cold slag, the average consumption of the steel materials in the examples using the cold slag is reduced by 8.2kg/t steel (the average consumption of the steel materials in the examples 1 to 3 is 1061.6kg/t, and the average consumption of the steel materials in the comparative examples 1 to 3 is 1069.8kg/t), thereby saving the cost by about 24.6 yuan/t steel.
In conclusion, the cold slag slagging method can completely meet the production requirements of common steel grades, and according to the current use effect, after cold slag is used, the early-stage slagging time of the smelting process is shortened by nearly 1min, the early-stage slag alkalinity is improved by 0.18, and the dephosphorization rate is increased by 6.3%. Meanwhile, the metal yield is increased, the steel material contrast is reduced by 8.2kg/t steel, the cost is saved by 24.6 yuan/t steel according to the current cost of 3 yuan/kg steel material, and the cost of solvent material is also saved. Although the converter desulfurization rate is increased, the converter desulfurization rate can still meet the composition requirements of the common steel grades produced at present, such as Q235. Therefore, the cold slag used for slagging in the smelting process has great superiority in process improvement and production economic benefit, the gas realizes the recycling of the cold slag of the converter, the steel smelting process is improved, and the steel smelting cost is saved.
The embodiments described above are only preferred embodiments of the invention and are not exhaustive of the possible implementations of the invention. Any obvious modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the invention so modified beyond the spirit and scope of the present invention.
Claims (8)
1. The cold slag slagging agent for converter steelmaking is characterized by comprising the following raw materials in parts by weight:
2. the cold slag slagging agent for converter steelmaking according to claim 1, wherein the basicity of the converter cold slag is 2.9-3.5; the converter cold slag comprises FeO with the mass content of 18-25%.
3. The cold slag slagging agent for converter steelmaking according to claim 2, wherein the converter cold slag further comprises the following raw materials in percentage by weight:
4. the cold slag slagging agent for converter steelmaking according to claim 1, wherein the particle size of the converter cold slag is 40-70 mm.
5. The cold slag forming agent for converter steelmaking as claimed in claim 1, wherein the converter cold slag is obtained by cooling slag discharged from converter steelmaking.
6. A method of using the cold slag forming agent for converter steelmaking according to any one of claims 1 to 5, wherein the steel smelting is performed by using the slag forming agent according to any one of claims 1 to 5.
7. The use method of the cold slag slagging agent for converter steelmaking as claimed in claim 6,
the mass ratio of the steel material to the slag former in the steel smelting process is 13400-13500: 315-525.
8. The use method of the cold slag slagging agent for converter steelmaking as claimed in claim 6,
the steel smelting process comprises the following steps:
charging steel material and converter cold slag into a converter, wherein the early stage is 150-200mm higher than a carbon drawing gun position, the oxygen pressure is 8.5-9.0Mpa, and the oxygen flow is 14000m 3 And h, adding metallurgical ash accounting for 60-65% of the total weight of the metallurgical ash, limestone and dolomite, melting the molten slag completely when oxygen supply is carried out for 1.8-2.6min, overflowing molten-state metallurgical slag from a furnace mouth, taking a slag sample, and measuring the alkalinity R: 1.8-2.2, starting carbon flame 3-4min after blowing, adding the rest metallurgical ash, slightly drying again, and lowering the lance to pull when the drying time is 35-60s and 9.5-10.5min150mm above the carbon gun position, descending the gun to the carbon pulling gun position in 11min, carbon pulling time 45s, no splashing in the process, no slag during end point tapping, end point slag alkalinity, R: 2.5-3.5, end temperature 1627-.
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| CN103215408A (en) * | 2013-04-28 | 2013-07-24 | 山东广富集团有限公司 | Method for converter steelmaking by adding steel slag blocks |
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| CN103215408A (en) * | 2013-04-28 | 2013-07-24 | 山东广富集团有限公司 | Method for converter steelmaking by adding steel slag blocks |
| CN103882178A (en) * | 2014-04-01 | 2014-06-25 | 首钢总公司 | Converter steelmaking process for recycling converter final slag |
| KR20160001547A (en) * | 2014-06-27 | 2016-01-06 | 현대제철 주식회사 | Method for reusing slag |
| CN108676957A (en) * | 2018-06-27 | 2018-10-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold conditions slag renewable resources semi-steel making technique |
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