梅山铁矿铁精矿降硅选矿工艺试验

为进一步满足冶炼对铁精矿质量的要求，梅山铁矿选矿厂需降低铁精矿中SiO₂的含量。为此，对生产出的强磁精矿进行了正浮选和细筛-再磨强磁选2种工艺流程的降硅试验研究。试验结果表明：2种工艺都能有效降低总精矿中的SiO₂含量至4%以下，虽回收率有所损失，但最终精矿的碱比明显提高，矿石的自熔性变好，建议对这2种工艺进行试验室扩大连续试验和工业试验，以为现场技术改造提供参考依据。

Beneficiation Tests on Reduce Silicon of Iron Concentrate in Meishan Iron Plant

Reduce the content of SiO₂ in iron ore concentrate become a necessity for Meishan iron ore, in order to well meet the smelting requirements of iron ore quality. Study was conducted with positive flotation and fine sieve-regrinding and strong magnetic process separately. The results showed that: both of the two process could ruduce the content of SiO₂ to 4% in total concentrate, though recovery rate was lower, but the alkali ratio significantly increased, and the self-fluxing quality become better. Laboratory and industrial tests was suggested to continue, in order to provide reference basis for on-site process.