高磷铁矿气基还原冶炼低磷铁

Dephosphorization of high-level phosphorus iron ore by gas-based reduction and melt separation

针对鄂西鲕状高磷铁矿难选、难冶的特点,从该矿矿相结构分析出发,在使用HSC计算化学软件的热力学模拟和具体实验的基础上,提出了气基还原+电炉熔分冶炼高磷铁矿的新型工艺.实验结果与HSC软件模拟结果吻合.实验室含P1.28%的高磷铁矿通过CO还原后熔分,得到含P0.27%的低磷铁;通过H2还原后熔分,得到含P0.33%的低磷铁.由熔分铁的SEM和EDS结果证实,P仍以夹杂物的形态存在,可以在熔分时通过去除铁水中夹杂物的方法进一步脱磷,以满足炼钢的要求.

The traditional methods of mineral and metallurgical processes are very difficult in treating the high-level phosphorus iron ore from west Hubei Province of China to meet the requirements of the iron and steel industry. A new technical route, gas-based reduction and electrical furnace melt separation, was proposed and demonstrated. Based on the mineral phases, thermodynamic simu- lation （performed with HSC） was carried out first, and then gas-based reduction experiment and electrical furnace melt separation ex- periment were conducted. Gas-based reduction results agree with the numerical simulation. The phosphorus content decreases from 1.28% in the ore sample to 0.27% in the final metal sample by using CO reduction and melt separation; and it decreases from 1.27 % in the ore sample to 0.33 % in the final metal sample by using H2 reduction. The melt separation SEM and EDS analyses of metal samples after melt separation show P exists as impurities. These impurities can be removed by refining methods in the melting stage to meet the requirements of steelmaking.