CN1876873A - Ferrovanadium nitride alloy and preparation method thereof - Google Patents
Ferrovanadium nitride alloy and preparation method thereof Download PDFInfo
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Abstract
This invention is azotize ferro-vanadium and method for making same. The composition of azotize ferro-vanadium is: vanadium 47-81%, nitrogen 8-16%, iron 4-44%, carbon<=1%, silicon<=1.50%, aluminium<=0.01%, manganese<=0.50%, sulfur<=0.05%, phosphor<=0.05%; the method includes following steps: mixing powderedvanadium compound, carbonaceous reducer and ferrous powder, then adding agglomerant, briquetting, putting them into metallurgical furnace with protective atmosphere when they have been dry to do carbon thermal reduction, nitridation and sintered reaction, the temperature of carbon thermal reduction part is: 900-1200DEG C, the temperature of nitridation part is: 1200DEG C-1350 DEG C, the temperature of sintered reaction part is: 1350DEG C-1490DEG C, the total reaction time is: 2-18 hours. This invention simplifies traditional technique, greatly shortens reaction period, reduces the equipment input and cost of production, the obtained products is of stable quality, high vanadium yield, large density, low fusing point in steel application.
Description
Technical field
The invention belongs to the iron alloy preparing technical field, particularly a kind of method for preparing ferrovanadium nitride alloy.
Background technology
The main application of vanadium is the alloying element as the alloy smelting steel, the industrial scale applications data that contain vanadium steel in a large number show: increase the yield strength that nitrogen content can improve steel, major cause is that the increase of nitrogen in steel content has reduced grow up trend with alligatoring of precipitated phase, in the steel after the nitrogen pick-up, the precipitated phase particle attenuates, thereby gives full play to the strengthening effect of vanadium in steel.In high-strength low-alloy steel, the use of ferrovanadium nitride can efficient hardening and crystal grain thinning.Under the prescribed strength level, nitrogen pick-up can be saved the vanadium consumption in the steel, and ferrovanadium nitride is compared with vanadium iron and can be saved the vanadium consumption up to 15%～30%, reduces by 25～45 yuan/ton of steel-making cost.
In the steel there be usually the method for nitrogen pick-up: (1) adds vanadium nitride; (2) add calcium cyanamide; (3) nitrogen flushing; (4) use traditional ferrovanadium nitride.The weak point of these methods has: the vanadium nitride density of method (1) is low, easily floats over the molten steel surface, and the low and temperature of fusion of effective yield of vanadium is higher than vanadium iron, adds behind the stove during smelting to be difficult for; The weak point of method (2) is that the yield of nitrogen is low and unstable; During employing method (3), nitrogen flushing needs special device, and the yield of nitrogen is extremely low; Effective yield of vanadium was higher when the traditional ferrovanadium nitride of method (4) application was made steel, but effective yield of vanadium was lower when ferrovanadium nitride prepared, and produce vanadium iron fragmentation again, briquetting, vacuum solid nitriding earlier and obtain ferrovanadium nitride, and preparation section is long and complicated, the production cost height is difficult to promote.
Among the patent CN1343794A in 2002 V has been proposed
2O
3Electro-aluminothermic process is smelted the FV80 processing method, has proposed V among the patent CN1343795 in 2004
2O
3Electro-aluminothermic process is smelted the FV50 processing method.Adopt V
2O
3, put into electrosmelting behind aluminium powder, abrasive grit and the lime batch mixing, the alloy mixture of smelting vanadium carries out shrend after coming out of the stove and isolating slag, carries out break-iron, fragmentation, screening, packing at last and handles, the yield of finished product vanadium only reaches 94.5%.Advantage is the density height, and temperature of fusion was lower than vanadium nitride when vanadium iron was used in steel.Shortcoming is the vanadium iron products production
The relative vanadium nitride of the yield of vanadium is lower in the process, and postprocessing working procedures is many, and the strengthening effect of vanadium was lower than vanadium nitride when vanadium iron was used in steel.
Nineteen eighty-two В. П. people such as н e щ ч e н к о put into the ladle that has spirit hole brick with the qualified vanadium iron melt of smelting in the electric furnace, feed nitrogen simultaneously and carry out liquid nitriding.The chemical constitution of vanadium iron is: Fe :～35%, and V :～45%, Mn:5%～6%, Si:1.2%～1.7%, C:0.3%～0.5%.Carried out 5 stoves tests under industrial scale, the result shows that the nitrogen content of product is lower after the liquid nitriding, average out to 1%～1.2%.
Nineteen eighty-three, С. Γ. people such as Γ р и щ e н к о adopt vanadium iron powder to carry out solid-state nitriding.The vanadium iron that will contain 37%～50%V is milled to the fine powder of 1～0.7mm granularity through ball mill, in the 600kW resistance furnace, feeds nitrogen down in 1050 ℃ and carries out nitriding.The nitridation process main points are: vanadium iron powder is packed in 6 irony dishes, pack in the stove, heat up while vacuumizing, furnace temperature can reach 1050 ℃ behind 3h approximately, and vacuum tightness can reach 40Pa, feeds nitrogen afterwards in stove, behind 1050 ℃ of following nitriding 17h, resistance furnace begins cooling, reduces to room temperature through 22h approximately, and sample is come out of the stove.After handling, above-mentioned nitriding obtains to contain vanadium 37%～38%, nitrogenous 5.0%～6.6% vanadium iron.
Nineteen eighty-three jinzhou Ferroalloy Plant country " seven. five " under the support of great Program for Tackling Key Problems project, developed carbon vanadium nitride and ferrovanadium nitride.Carry out solid-state nitriding with the FeV50 vanadium iron powder, the influence of the dividing potential drop of nitrogen, nitriding temperature, vanadium iron powder granularity and nitriding time in the gas phase when systematically having studied nitriding, point out that best nitriding condition is: granularity is: 0.1～0.5mm, and the time is 1～15h, temperature is 1050 ℃ and P
N2Be 101325Pa, the ferrovanadium nitride nitrogen content that obtains under this condition is 6%～9% (to contain vanadium 44%～47%V).
1984, people such as Zhang Xianpeng were under laboratory condition, and having studied granularity is 1mm～100 orders; 100～200 orders; The vanadium iron powder (Fe:54%V:43%) that 200 orders are following, under 1373K, 1473K and 1573K temperature, the dividing potential drop PN of nitrogen in the stove
2101325Pa and nitriding time are 10,20,30 and the nitriding situation of vanadium iron powder during 40min.Experiment points out that nitrogen content is 8.2% in the vanadium iron under 1473K, and nitrogen content is 8.47% in the vanadium iron under 1573K.Dynamic characteristic when also having studied solid-state vanadium iron powder nitriding simultaneously.
Offal when the vanadium iron bulk that humans such as nineteen ninety Mu Hongbo contain 78.45%～78.51%V is pulverized is worn into powder, and water glass is done the agent of powder knot, at 80MPa forming under the pressure (φ 20*44mm), after the demoulding at 120 ℃ of following drying and dewaterings.The nitridation conditions of nitriding is: 1000～1200 ℃; 0.5～1.0h, nitrogen flow are 10L/min.Gained nitriding sample composition: 66%～67%V, 6%～8%N.
U.S. Xi Erde alloy company produces ferrovanadium nitride with the vanadium iron powder nitriding, and its typical products composition is: V:65%～67%N:11%～13%.
" a kind of vanadium nitrogen microalloy additive and preparation method " proposed in CN1480548A in 2004; CN1422800A patent " a kind of production method of vanadium nitride " in 2003; two patents have all proposed to add carbonaceous reducing agent and binding agent with vanadium compound and have mixed the back compound stalk forming; carbonization and nitrogenizing reaction take place in the stove of logical shielding gas again, produce vanadium nitride.The advantage of this patent is that technical process is short, and ferro-vanadium aftertreatment preparation section is few relatively, and the recovery rate of vanadium is higher than vanadium iron in the product.When using in steel, the relative vanadium iron consumption of equality strength effect is less.The shortcoming of this patent is that product density is low, (generally at 2.8-3.3 gram/cubic centimetre), the high vanadium nitride of molten steel density adds inconvenience during smelting, and the temperature of fusion of vanadium nitride in steel is higher than about 160 ℃ of vanadium iron, and be also limited when using behind trimming and stove.
On using, ferrovanadium nitride has the advantage of vanadium iron and vanadium nitride concurrently, and avoided the shortcoming of said two products, it is a kind of well-adapted vanadium nitrogen element additive in the ferrous metallurgy, but effective yield of vanadium is low among the preparation method of traditional ferrovanadium nitride, production process is complicated, the cycle is long, cost is high, the disposable of equipment has high input, and is difficult to industrial applications.
Summary of the invention
The technical problem to be solved in the present invention is, deficiency at the prior art existence, propose a kind of ferrovanadium nitride alloy and preparation method thereof, in metallurgical furnace, carry out carbonization, nitrogenize and sintering reaction simultaneously, disposable acquisition ferrovanadium nitride alloy after utilizing the compound, carbon, iron powder mixing briquetting of vanadium; The gained ferrovanadium nitride has the advantage of vanadium iron and vanadium nitride concurrently, and the recovery rate height of constant product quality, vanadium, density are greatly, the application fusing point is low in steel, and product has more the market competitiveness.
One of technical solution of the present invention is that the weight percent composition of described ferrovanadium nitride alloy is:
Vanadium 47-81%;
Nitrogen 8-16%;
Iron 4-44%;
And in the described ferrovanadium nitride alloy, carbon containing≤1%, silicon≤1.45% aluminium≤0.01%, manganese≤0.50%, sulphur≤0.05%, phosphorus≤0.05%.
Two of technical solution of the present invention is that the preparation method of described ferrovanadium nitride alloy is:
(1) gets granularity at-80 purpose vanadium compound, in proportion with addition of solid carbonaceous reducer, iron powder and binding agent;
(2) with the even back of above-mentioned mixing of materials briquetting, forming pressure is 800-2000Pa;
(3) with the briquetting after the moulding through 120-150 ℃, 2-4 hour drying;
(4) metallurgical furnace that stepped start-stop system is sent into logical protective atmosphere behind the dried briquetting dress boat reacts, the flow direction of protective atmosphere is opposite with the direction of motion of briquetting, and gas flow remains the interior atmosphere pressures of metallurgical furnace and is higher than ambient pressure 20-80Pa, and the atmosphere dew point is lower than-40 ℃;
Described metallurgical furnace has the heating zone of three sections independent controls at least to finish reduction, nitriding and sintering reaction, the temperature of reduction section is that 900 ℃～1200 ℃, the temperature of nitriding section are that 1200 ℃～1350 ℃, the temperature of sintering stage are 1350 ℃～1490 ℃, and briquetting is 2～18 hours in the metallurgical furnace internal reaction time;
(5) briquetting is cooled to come out of the stove below 250 ℃ under nitrogen protection after the metallurgical furnace internal reaction is finished, and obtains the ferrovanadium nitride alloy of following composition (weight percent);
Vanadium 47-81%; Nitrogen 8-16%; Iron 4-44%; And in the described ferrovanadium nitride alloy, carbon containing≤1%, silicon≤1.45%, aluminium≤0.01%, manganese≤0.50%, sulphur≤0.05%, phosphorus≤0.05%.
Among the preparation method of ferrovanadium nitride alloy of the present invention, described vanadium compound is one or more in ammonium meta-vanadate, poly ammonium vanadate, Vanadium Pentoxide in FLAKES, vanadium dioxide, the vanadous oxide; Described carbonaceous reducing agent is one or more in graphite, coking coal powder, graphite electrode powder, the carbon black; Described iron powder is granularity-80 a purpose metal iron powder; One of described binding agent usable fibers element, starch, syrup etc. are all kinds of makes the aqueous solution and adds by the 5-12% of compound weight; Metallurgical furnace can be with the common carbon tube furnace of industrial use, shaft furnace, push boat type sintering oven, tunnel kiln etc.; Described protective atmosphere can be nitrogen, cracked ammonium or other reducing atmosphere.
Principle of the present invention is that described preparation method has simplified the preparation process of traditional ferrovanadium nitride alloy, and the production process of carrying out in two kinds of metallurgical furnaces of branch is realized in same metallurgical furnace; Adopt reduction under the normal pressure, nitriding and sintering, the electro-aluminothermic process smelting ferrovanadium alloy and the vacuum nitriding treating processes of contaminate environment have been avoided, saved complicated vacuum apparatus, the equipment input of making obviously reduces, and has also greatly shortened reaction time, increases substantially labour productivity, easier realization industrialization, energy consumption reduces because of the shortening of reaction time, and production cost also reduces significantly, has protected environment; The recovery rate of vanadium is higher than vanadium iron in the ferrovanadium nitride alloy product.
As known from the above, the present invention is a kind of ferrovanadium nitride alloy and preparation method thereof, it has been simplified the traditional preparation process technological process, has greatly shortened reaction time, has reduced equipment input and production cost, the gained ferrovanadium nitride has the advantage of vanadium iron and vanadium nitride concurrently, the recovery rate height of constant product quality, vanadium, density are greatly, the application fusing point is low in steel, and product has more the market competitiveness.
Embodiment
Embodiment 1: the barium oxide, Graphite Powder 99 250 grams, iron powder 45 grams that 1000 grams are contained vanadium 54.1%; add ball mill and pulverize mixing; cross 80 eye mesh screens; 105 milliliters of mixing compound stalk formings of cellulose aqueous solution of adding 1.5%; be pressed into the briquetting of Ф 20*20; handled in 2 hours through 120 ℃ of oven dry, the carbon tube furnace of putting into nitrogen protection carries out carbothermic reduction, nitriding, sintering reaction.Fs temperature 1200 degree, subordinate phase temperature 1350 degree, phase III temperature 1490 degree.Batch briquetting stopped 2 hours in the phase III, and nitrogen flow is higher than stove external pressure 30-60Pa to control its pressure in the stove, nitrogen dew point-40 degree.The reaction back is cooled to 150 ℃ and comes out of the stove under nitrogen protection.
The ferrovanadium nitride product composition that makes is: V:78.31%, Fe:6.57%, N:14.11%, C:0.31%, P:0.009%, S:0.015%, Si:0.14%, Mn:0.13%, Al:0.01%, product density: 4.51 gram/cm
3
Embodiment 2: barium oxide powder 1000 grams that contain vanadium 54.1%, Graphite Powder 99 205 grams, iron powder 460 grams, mixing and ball milling, cross 80 eye mesh screens, add 120ml and contain 1.5% cellulose aqueous solution, the mixing briquetting, be pressed into the material piece of φ 20*20, through 110 ℃ of oven dry after 2.5 hours, the horse of putting into logical nitrogen not sintering oven temperature carries out carbothermic reduction, nitriding and sintering reaction under 1100 ℃～1460 ℃,, 1460 ℃ of warm area soaking times 2.5 hours.Be cooled to below 100 ℃ with stove protection and come out of the stove.Greater than stove external pressure 30～70Pa, spend by nitrogen dew point-40 with the protection furnace pressure for nitrogen flow.
The ferrovanadium nitride composition that obtains: V:48.1%, Fe:40.96%, N:9.95%, C:0.19%, P:0.08%, S＜0.01%.Si:0.94%, Mn:0.21%, product density: 5.64 gram/cm
3
Claims (7)
1, a kind of ferrovanadium nitride alloy is characterized in that, its weight percent composition is:
Vanadium 47-81%;
Nitrogen 8-16%;
Iron 4-44%;
And in the described ferrovanadium nitride alloy, carbon containing≤1%, silicon≤1.45% aluminium≤0.01%, manganese≤0.50%, sulphur≤0.05%, phosphorus≤0.05%.
2, a kind of preparation method of ferrovanadium nitride alloy is characterized in that, this method is:
(1) gets granularity at-80 purpose vanadium compound, in proportion with addition of solid carbonaceous reducer, iron powder and binding agent;
(2) with the even back of above-mentioned mixing of materials briquetting, forming pressure is 800-2000Pa;
(3) with the briquetting after the moulding through 120-150 ℃, 2-4 hour drying;
(4) metallurgical furnace that stepped start-stop system is sent into logical protective atmosphere behind the dried briquetting dress boat reacts, the flow direction of protective atmosphere is opposite with the direction of motion of briquetting, and gas flow remains the interior atmosphere pressures of metallurgical furnace and is higher than ambient pressure 20-80Pa, and the atmosphere dew point is lower than-40 ℃;
Described metallurgical furnace has the heating zone of three sections independent controls at least to finish reduction, nitriding and sintering reaction, the temperature of reduction section is that 900 ℃～1200 ℃, the temperature of nitriding section are that 1200 ℃～1350 ℃, the temperature of sintering stage are 1350 ℃～1490 ℃, and briquetting is 2～18 hours in the metallurgical furnace internal reaction time;
(5) briquetting is cooled to come out of the stove below 250 ℃ under nitrogen protection after the metallurgical furnace internal reaction is finished, and obtains the ferrovanadium nitride alloy of following composition (weight percent);
Vanadium 47-81%; Nitrogen 8-16%; Iron 4-44%; And in the described ferrovanadium nitride alloy, carbon containing≤1%, silicon≤1.45%, aluminium≤0.01%, manganese≤0.50%, sulphur≤0.05%, phosphorus≤0.05%.
3, ferrovanadium nitride alloy preparation method according to claim 2 is characterized in that, described vanadium compound is one or more in ammonium meta-vanadate, poly ammonium vanadate, Vanadium Pentoxide in FLAKES, vanadium dioxide, the vanadous oxide.
4, ferrovanadium nitride alloy preparation method according to claim 2 is characterized in that, described carbonaceous reducing agent is one or more in graphite, coking coal powder, graphite electrode powder, the carbon black.
5, ferrovanadium nitride alloy preparation method according to claim 2 is characterized in that, described iron powder is granularity-80 a purpose metal iron powder.
6, ferrovanadium nitride alloy preparation method according to claim 2 is characterized in that, described binding agent adds by the 5-12% of compound weight with one of all kinds of aqueous solution of making such as Mierocrystalline cellulose, starch, syrup.
7, ferrovanadium nitride alloy preparation method according to claim 2 is characterized in that, described protective atmosphere is the reducing atmosphere of nitrogen, cracked ammonium gas.
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| US3334992A (en) * | 1964-01-27 | 1967-08-08 | Union Carbide Corp | Vanadium containing addition agent and process for producing same |
| CN1212416C (en) * | 2003-03-13 | 2005-07-27 | 东北大学 | Vanadium nitrogen microalloy additive and its preparing method |
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| CN112342456A (en) * | 2020-09-17 | 2021-02-09 | 北京科技大学 | Method for preparing nitrided ferrovanadium by two-step carbothermal reduction nitridation |
| CN113652570A (en) * | 2021-08-20 | 2021-11-16 | 湖南众鑫新材料科技股份有限公司 | Process for increasing nitrogen content of vanadium nitride iron |
| CN115821100A (en) * | 2022-11-21 | 2023-03-21 | 攀钢集团研究院有限公司 | Method for preparing nitrided ferrovanadium by using pushed slab kiln |
| CN115821100B (en) * | 2022-11-21 | 2024-05-31 | 攀钢集团研究院有限公司 | Method for preparing vanadium nitride iron by using pushed slab kiln |
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