Sintered ferrovanadium alloy and its prepn process

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...

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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) Carbothermal method, low cost, but the product contains high carbon, and many steel types cannot be used;

[0008] 2) Silicothermal method, although the cost is low, it is difficult to produce high-grade vanadium-iron alloy

[0009] 3) Aluminum thermal method, aluminum thermal method mainly uses V 2 o 5 , aluminum powder and iron oxide undergo thermite reaction to produce vanadium-iron alloy, but there are defects such as excessive reaction heat, complex process, high aluminum consumption and high cost

At the same time, it solves the problems of low effective yield of vanadium, complex production process, high cost, and large environmental pollution caused by smelting in the traditional ferrovanadium preparation method