Manufacturing method of molybdenum or vanadium oxide briquetting for steelmaking alloying

Abstract

The invention discloses a manufacturing method of molybdenum or vanadium oxide briquetting for steelmaking alloying, which comprises the following steps of: adding an inhibitor, a fluxing agent and a reducing agent into molybdenum or vanadium oxide; uniformly mixing the raw materials; wetting the mixture by a water-soluble adhesive; and pressing the wet mixture into a block, wherein the inhibitoris magnesia, the fluxing agent is fluorite and the reducing agent is ferrosilicon powder or carborundum powder. In the oxide briquetting, MgO contained in the magnesia is in tightly contact with MoO3or V2O5 to generate magnesium molybdate or vanadium molybdate difficult to volatilize by the solid-phase reaction, and the volatilization of MoO3 or V2O5 can be effectively inhibited; and meanwhile, the magnesia is difficult to hydrate and a water soluble compound (water glass, brine, urea-formaldehyde resin or the like) can be used as the adhesive. The method is simple and easy to operate, has high yield of directly alloying elements and can be popularized and applied in steel and iron works. Not only can the energy be greatly saved, the CO2 emission is reduced and the environmental load is reduced, but also the alloying cost of molten steel can be greatly reduced.

Description

technical field [0001] The invention relates to a steelmaking alloying agent, in particular to a method for preparing a molybdenum or vanadium oxide briquette used for steelmaking alloying. Background technique [0002] Molybdenum and vanadium are important alloying elements in steel. Molybdenum can significantly improve the thermal strength, hardenability and tempering stability of steel, and has a significant effect on improving the strength of steel; adding vanadium to steel can also significantly improve the performance of steel, increasing the strength by 10% to 20%, reducing the The weight of the structure is 15% to 25%. Vanadium is widely used in the production of high-speed steel and microalloyed steel. Steelmaking by direct alloying of oxides can save the ferroalloy production process, shorten the production cycle, save energy and reduce emissions, reduce environmental load, and greatly reduce the cost of molten steel alloying. [0003] In the 1980s, domestic res...

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Problems solved by technology

[0004] From the end of 1990s to the beginning of this century, the General Institute of Iron and Steel Research and Chongqing Special Iron and Steel Company conducted a large number of basic research and industrial experiments on the direct alloying of molybdenum oxide to smelt high-speed steel. It is easy to volatilize, and the recovery rate of molybdenum is still difficult to increase. Then, the method of adding damping agent quicklime (CaO) to suppress the volatilization of molybdenum oxide is studied, that is, adding molybdenum oxide, quicklime and reducing agent to the electric arc furnace for reduction, and the recovery rate of molybdenum The highest reached 96%, but the yield was unstable (Li Zhengbang, Guo Peimin, Feng Zhongyu. Theoretical analysis and industrial experiment of direct reduction alloying of scheelite and molybdenum oxide[J]. Iron and Steel, 1999, 34(10): 20 ~23; Li Zhengbang, Guo Peimin, Lin Gongwen. Resource development engineering - technology of smelting alloy steel from oxide ore[J]. China Tungsten Industry, 2001, 16(5~6): 45~47); Guo Peimin, Zhao Pei, Li Zhengbang . Effect of Additives on Volatility of Molybdenum Oxide at High Temperature[J]. Special Steel, 2006, 27(6): 30~31

[0011] (1) Molybdenum oxide and vanadium oxide are volatile at high temperature, and the yield of molybdenum or vanadium is low and unstable, which brings difficulties to on-site operation;

[0012] (2) Since quicklime (CaO) is easy to hydrate, adding quicklime (CaO) to molybdenum oxide or vanadium oxide has no suitable binder to make it shape

Therefore, the dust loss in the process of adding powder to the ladle is large, the working environment is harsh, and CaO inhibits MoO 3 and V 2 o 5 The volatile effect is not fully exerted

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