Sintered ferrovanadium alloy and its prepn process

A technology of vanadium-iron alloy and vanadium compound, which is applied in the field of preparing sintered vanadium-iron alloy, can solve the problems of complex process, long preparation process, and low vanadium effective yield, and achieve the goal of simplifying the preparation process, saving aluminum alloy consumption, and improving labor productivity Effect

Inactive Publication Date: 2006-10-18
陈东红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Method 1) Adding vanadium-iron alloy is a commonly used method; the disadvantage of method 2) is that the density of vanadium nitride is low and it is easy to float on the surface of molten steel, the effective yield of vanadium is low and the melting temperature is higher than that of ferro-vanadium. It is not easy to add; method 3) although the effective yield of vanadium is higher when ferrovanadium nitride is used in steelmaking, the effective yield of vanadium is lower when ferrovanadium nitride is prepared. Solid-state nitriding to obtain ferrovanadium nitride, the preparation process is long and complicated, the production cost is high, and it is difficult to popularize
[0007] 1) Carbotherma

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Put 1000 grams of vanadium oxide containing 54.1% vanadium, 250 grams of graphite powder, and 142 grams of iron powder into a ball mill to pulverize and mix them, pass through a 80-mesh screen, add 105 ml of 1.5% cellulose aqueous solution, mix evenly and briquette, and press into The briquette of Φ20*20 is dried at 120°C for 3 hours, and then put into a carbon tube furnace protected by ammonia gas for carbothermal reduction and sintering reaction. The temperature in the first section is 1100 degrees, and the temperature in the second section is 1430 degrees. The mixture briquette stays in the second stage for 3 hours, the ammonia gas flow rate in the furnace is controlled to be 30-60 Pa higher than the pressure outside the furnace, and the ammonia dew point is -40 degrees. After the reaction, it was cooled to 150°C under the protection of ammonia gas and released from the furnace.

[0037] The obtained sintered vanadium ferroalloy product composition:

[0038] V: 78....

Embodiment 2

[0042] Put 1,000 grams of vanadium oxide powder containing 54.1% vanadium, 205 grams of graphite powder, and 563 grams of iron powder, mix and ball mill, pass through an 80-mesh sieve, add 120ml of cellulose aqueous solution containing 1.5%, mix and briquetting, and press into φ20 *20 material blocks, after drying at 110°C for 2.5 hours, put them into a muffle sintering furnace with nitrogen gas at a temperature of 800°C to 1380°C for carbothermal reduction and sintering reaction, and hold at 1380°C for 2 hours Hour. Cool down with furnace protection to below 250°C and release from the furnace. The flow rate of nitrogen gas is to protect the pressure inside the furnace to be 30-70 Pa higher than the pressure outside the furnace, and the nitrogen dew point is -40 degrees.

[0043] The composition of the obtained sintered vanadium ferroalloy:

[0044] V: 48.1%, Fe: 50.96%, C: 0.19%, P: 0.0596, S<0.01%. Si: 0.84%, Mn: 0.32%, Al: 0.05%,

[0045] Its product density: 6.74 g / cm ...

Embodiment 3

[0047]Mix and grind 1,000 grams of oxide powder containing 64.1% vanadium, 167 grams of graphite powder, and 618 grams of iron powder, pass through an 80-mesh sieve, add 150 ml of cellulose solution containing 1.5%, mix well, and press into a φ20 *20 blocks are dried at 110°C for 3 hours and then placed in a sintering furnace protected by decomposing ammonia gas. The dew point of ammonia gas is -40°C, the temperature of the first stage is 1050-1200°C, and the temperature of the second stage is 1300-1410°C. The second holding time is 4 hours. Cool down to 200°C under the protection of reducing gas to release from the furnace.

[0048] The composition of the obtained sintered ferrovanadium product is:

[0049] V: 50.13%, C: 0.81%, Fe: 48.09%, P: 0.01%, S: 0.02%. Si: 0.71%, Mn: 0.31%, Al: 0.03%,

[0050] Its product density: 6.81 g / cm 3 .

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PUM

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Abstract

The present invention belongs to the field of ferrovanadium alloy preparing technology. The material comprising powdered vanadium compound, carbon reductant and iron powder is first added with adhesive and pressed into block, and the block after stoving is made to produce carbon thermal reduction at 800-1200 deg.c and sintering reaction at 1250-1440 deg.c inside a metallurgical furnace to obtain high density sintered ferrovanadium alloy, with the total reaction time inside the furnace being 2-12 hr. The sintered ferrovanadium alloy consists of V 47-82 wt%, C not more than0.50 wt%, Fe 17-52 wt%, Si not more than 1.50 wt%, Al not more than 0.01 wt%, Mn not more than 0.50 wt%, S not more than 0.05 wt% and P not more than 0.06%.

Description

Technical field [0001] The invention belongs to the technical field of ferroalloy preparation, and in particular relates to a method for preparing sintered vanadium-iron alloy. Background technique [0002] The main use of vanadium is as an alloying element for smelting alloy steel. A large number of industrial-scale application data of vanadium-containing steel show that the use of vanadium-iron alloy can effectively strengthen alloy steel and refine alloy steel grains. [0003] The addition methods of vanadium element in steelmaking application usually include: [0004] 1) Add vanadium-iron alloy; 2) Add vanadium nitride; 3) Use vanadium-iron nitride; [0005] Method 1) Adding vanadium-iron alloy is a commonly used method; the disadvantage of method 2) is that the density of vanadium nitride is low and it is easy to float on the surface of molten steel, the effective yield of vanadium is low and the melting temperature is higher than that of ferro-vanadium. It is not eas...

Claims

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Application Information

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IPC IPC(8): C22C27/02C22C1/04
Inventor 陈东红苏华
Owner 陈东红
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