高铅渣液态还原过程中有价金属分布

Distribution of valuable metals in liquid high lead slag during reduction process

以铅精矿氧化熔炼产生的高铅渣为原料,通过静态实验研究其熔池熔炼还原过程。使用X射线衍射(XRD)和等离子体发射光谱(ICP)对反应原料及产物进行分析,探讨铁硅比、钙硅比、还原煤用量、还原温度、还原时间等对有价金属元素(Pb、Cu、Zn)在高铅渣还原产物中分布的影响。结果表明:静态实验中的Pb、Cu主要进入金属相,而Zn则基本进入还原渣中。最有利于有价金属综合回收的工艺条件如下:铁硅比1.25,钙硅比0.8,还原时间为60 min,还原温度为1200℃,还原剂的用量为理论量的1.3倍。

The bath smelting reduction process of high lead slag, which is generated in the lead concentrate smelting process, was studied in static experiments. The raw material and the products of the process were analyzed using X-ray diffraction （XRD） and inductively coupled plasma （ICP）. The influence of technical parameters, including iron to silica ratio, calcium oxide to silica ratio, dosage of reductant, reduction temperature and reduction time, on the distribution of valuable metals between the products of the reduction process was investigated. The results reveal that Pb and Cu mainly enter the metal phase, while Zn mainly enters the slag phase. The best process parameters for comprehensive metal recovery are that iron to silica ratio is 1.5, calcium oxide to silica ratio is 0.8, reduction temperature is 1200℃, reduction time is 60 min, dosage of reductant is 1.3 times of the stoichiometric value.