硫酸渣脱硫试验研究

Research on the Desulfurization of Pyrite Slag

介绍了硫酸渣利用技术发展状况及焙烧硫酸渣特性,通过试验确定化学法处理硫酸渣最佳工艺条件:浸出剂为王水,药剂用量为5%,药剂浓度50g/L,反应温度70℃,浸出时间2h。试验得到的铁精矿品位60.70%,回收率98.50%,脱硫率62.10%,含硫量0.27%。在试验的基础上对硫酸渣浸出机理进行了分析,指出了浸出剂对CaSO4溶解、对金属硫化物氧化溶解、对碱性氧化物溶解的促进作用,同时指出水洗也是化学法处理硫酸渣工艺的关键,水洗既可以促进可溶性物质的溶解,也可以清除可溶性物质的附着。

The paper describes the current development of pyrite slag utilization technology and the characteristics of roasted pyrite slag. The optimal process conditions for pyrite slag treatment by chemical method were determined by experiments, including using aqua regia as the leaching agent at a 5% dosage and a 50 g/L concentration, a 70 ℃ reaction temperature and a 2 h leaching time. The iron concentrate obtained by the experiment had a 60.70% iron grade, 98.50% recovery, 62.20% desulfurization rate and a 0.27% sulfur content. Based on the experiments, the pyrite slag leaching mechanism is analyzed. It is concluded that the leaching agent can promote the dissolution of CaSO4, oxidation dissolution of metal sulphides and dissolution of basic oxides, and that water rinsing is also the key in the process of treating pyrite slag by chemical method, which can promote the dissolution of soluble substances and also clear off their attachment.