熔融还原冶炼高速钢

对用白钨矿、氧化钼和钒渣冶炼高速钢进行热力学和动力学的计算与分析。在熔融还原过程中,CaWO_4、MoO_3、V_2O_5、将被C、CaC_2、Si-Fe、SiC所还原。反应过程包括:固-固反应、液-固反应、铁浴反应和液-液反应。开发了低温快速还原、控制渣量、抑制沸腾等技术。(WO_3)还原限制性环节是WO_3在熔渣中的扩散,改善渣流动性,扩大反应界面能加快WO_3的还原,用阻尼剂能有效抑制钼的挥发。 在20tAC电弧炉用氧化钨矿工业化生产高速钢M-2成功,质量优异,具有缩短工序、节约资源、降低能耗,提高成品率和改善环境等优点。综合上述功效,每吨M-2钢节约成本1780元。应用这一新技术,重庆特钢公司累计生产M—2钢7981t。

Smelting Reduction Process of High Speed Steel

Smelting reduction process of sheelite, molybdenum oxide and vanadium slag is considered by thermodynamic and kinetic calculation and analysis in the paper. Scheelite, molybdenum oxide and vanadium slag can be reduced by C, CaC2, Si-Fe and SiC in the smelting reduction process. The reduction process consist of solid -solid reaction, liquid -solid reaction, reaction in molten steel and liquid- liquid reaction. The technology can realize fast reduction in low temperature, control amount of slag and restrain boiling during reduction stage. The diffusion of WO3 is the restrictive step of reduction process of WO3. Improving fluidity of slag and enlarging areas of reaction interface can accelerate reduction process of WO3. The use of damping preparation can restrain volatilization of molybdenum oxide effectively. Industrial trial of making of M-2 high speed steel with oxide is conducted successfully in 20t AC-EAF. The quality of final steel is excellent. This process has the advantages of shortening working procedure, economizing resources, minimizing energy consumption and improving environment. All consequences can save the cost of 1780 yuan per ton. The M-2 high speed steel produced by this new technology added up to 7981t in Chongqing Special Steel Corporation.