硫铁矿制酸尾渣铁的利用研究

Research on Utilization of Pyrite Cinder from Sulfuric Acid-Making

我国拥有丰富的硫铁矿资源,硫铁矿不仅仅是硫资源,也是重要的铁资源。因此和其他制酸行业比较,硫铁矿制酸还有一个先天有利的条件,通过研究硫酸尾渣的矿物特性,发现制酸尾渣中铁矿物多具蜂窝状、浸染状及残余结构,其中尤以浸染状结构为主,故采用常规选矿方法铁的回收率和品位都不高。为此,提出了利用制酸厂的制酸废热,应用逆流式处理工艺回收制酸尾料中的铁。在磨矿浓度65%、湿式永磁半逆流磁选机场强0.1T、CaCO3用量8%、2#添加剂用量5%,处理时间40min、C用量8%时,获得了铁精矿品位63.55%,含硫0.19%,回收率达到83.11%。

China has rich pyrite resource, which is not only a sulfur resource but also an important iron resource. Therefore, compared with other materials for acid making, acid-making with pyrite has a congenital favorable condition. We have found through the study on the mineral properties of pyrite cinder that the iron minerals in the pyrite cinder are mostly of honerycomb-like, dissemination and residual structure, especially of dissemination structure. Therefore, the iron grade and recovery will not be high when conventional methods are used in its separation. It is proposed to use the waste heat from the acid-making process to recover the iron in the acid-making tailing by a countercurrent process. Under the conditions of a grinding pulp density of 65%, 1 000 A/m magnetic intensity of half-countercurrent wet permanent magnetic separator, 8% CaCO3, 5% 2# reagent, 40min treatment time and 8% C dosage, an iron concentrate containing 63.55% iron and 0.19% sulfur can be achieved, with a recovery reaching 83.11%.