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本文论述了中国“十一五”期间钢铁渣的生产量和利用率等现状。随着钢铁渣处理工艺和利用技术不断创新,技术水平逐步提高,设备得到大力推广应用,综合利用途径更加明确,利用规模不断扩大,取得了较好的经济效益和社会效益。大宗固体废物综合利用“十二五”规划和实施方案,大力发展和推广钢渣余热自解热闷处理技术和钢铁渣粉技术,本文重点介绍钢渣余热自解稳定化处理技术基本原理和工艺过程,钢渣在热闷冷却过程中发生物理化学作用而粉化,消除f-CaO因发生化学反应生成Ca(OH)_2体积膨胀造成的不稳定性。由于钢渣中含有10%残钢并和钢渣粘连包裹在一起,使回收的金属品位低,不能直接返回炼钢使用,采用宽带磁选机磁选,棒磨机剥离提纯。干式双辊磁选机磁选使回收的钢渣TFe品位大于85%,直接返回转炉炼钢,磁选粉TFe品位大于60%的返回烧结矿配料使用。磁选后的钢渣尾渣采用节能低耗的磨机将其粉磨至细度为420m~2/kg以上,可等量取代10%-40%的水泥配制各种强度的混凝土,提高混凝土抗冻性、耐磨性等耐久性。做到资源高价值利用,可节省水泥生产所需石灰石、粘土等资源,降低燃料和电力消耗,减排CO_2。具有显著的环境效益、经济效益。文章介绍了中国随着科学技术进步,近几年制订、修订了31项钢铁渣综合利用标准,对钢铁工业固体废物“零排放”起到了重要的推动作用。
This article discusses the status of steel slag production and utilization in China during the 11th Five-Year Plan period. With the continuous innovation of steel slag treatment technology and utilization technology, the technical level is gradually improved, the equipment is vigorously popularized and applied, the comprehensive utilization route is clearer, the utilization scale is expanding, and the better economic and social benefits have been achieved. Comprehensive utilization of bulk solid waste “Twelve-Five ” planning and implementation of programs to vigorously develop and promote self-heal boring steel slag waste heat treatment technology and iron slag technology, this paper focuses on the steel slag waste heat self-stabilizing treatment of the basic principles and technology Process, the slag in the process of hot and stuffy in the process of physical and chemical effects of pulverization, eliminating f-CaO due to the chemical reaction of Ca (OH) _2 volume expansion caused by instability. As the steel slag contains 10% residual steel and steel slag adhesion wrapped together, so that the recovery of metal grade is low, can not be returned directly to steelmaking, magnetic separator using broadband magnetic separator, rod mill stripping purification. Magnetic separation of dry double-roller magnetic separator to make recovery of steel slag TFe grade greater than 85%, directly returned to the converter steelmaking, magnetic separator TFe grade greater than 60% of the return of sinter ingredients used. Slag slag after magnetic separation using energy-saving low-cost mill grind it to a fineness of 420m ~ 2 / kg or more, can be equivalent to replace 10% -40% of the cement preparation of various strength concrete, improve concrete resistance Frozen, wear resistance and other durability. By using resources of high value, resources such as limestone and clay needed for cement production can be saved, fuel consumption and electricity consumption can be reduced, and CO 2 can be reduced. Has significant environmental benefits, economic benefits. This article introduces China’s progress in science and technology. In recent years, 31 steel slag comprehensive utilization standards were formulated and revised, which played an important role in promoting the “zero emission” of solid waste in the iron and steel industry.