钢渣中同时回收铁和磷的资源化利用新思路

A New Design of Fe and P Simultaneous Recovery From Steel Slag

钢渣是炼钢过程最主要的固体废弃物,其排放量逐年增加。综述了目前国内外钢渣资源化利用方式,特别关注了钢渣循环利用技术的进展。在此基础上,提出了一种改质结合熔融还原钢渣循环利用工艺构想,旨在同时回收钢渣中Fe和P,并将处理后的钢渣返回到炼钢工序中继续使用,同时生成的低品位高碳磷铁可作为合金用于炼钢生产。钢渣利用方式要适应低碳经济的要求,严格控制钢铁冶金过程固体废弃物排放量,尽可能采取廉价、可行的操作方式处理钢渣,并实现效益的最大化。

Steel slag is the main solid waste from steelmaking process,which output increases rapidly year after year.This paper sums up the utilization patterns of steel slag both at home and abroad,especially focusing on the development of reuse of steel slag.Basing on those,a new conception of steel slag reuse by adopting slag composition modification and smelting reduction is proposed,the aims of which are recovering the Fe and phosphor from steel slag simultaneously.The slag after treatment can be returned into steelmaking process again,meanwhile a kind of low grade ferrophosphorus as a byproduct will be obtained.Steel slag reuse should meet the request of lowcarbon economy,which decreases and restricts the solid waste discharge from iron and steel industry.More costly means for slag treatment to achieve a biggest benefit should be paid attention as possibly.