铅精矿协同铅膏、铅玻璃吹氧熔炼脱硫试验研究

Experimental study on oxygen-blowing co-smelting and desulfurization of lead concentrate with lead paste and lead glass

高品位的硫化铅精矿越来越少,铅基固废(如铅膏、铅玻璃)作为重要的二次铅资源越来越多地被用作铅冶炼的原料。本试验将铅精矿与铅膏、铅玻璃协同吹氧熔炼,采用单因素试验研究了氧气流量、熔炼温度、铁硅比以及钙硅比对协同熔炼过程脱硫率的影响,并采用XRD图谱分析了不同成分熔炼渣的物相变化。结果表明,随着氧气流量和温度的增加,脱硫率相应提高;当反应温度为1200℃、铁硅比在0.6~0.97、反应时间25 min时,脱硫率在95%以上;当铁硅比高于0.97时,渣中出现尖晶石相,炉渣黏度增加,脱硫率降低;钙硅比由0.22增加到0.87,炉渣脱硫率先升高后降低;在钙硅比为0.49时,脱硫效果较好,最终渣含硫降至0.61%,脱硫率达到96.99%。此研究可为铅冶炼和回收提供参考。

With the decreased amount of high-grade lead sulfide concentrate,the lead-based solid wastes such as lead paste and lead glass as significant secondary lead resources have increasingly been used as the raw material for lead smelting.Lead concentrate is co-smelted with lead paste and lead glass by oxygen blowing in this experiment.The effects of oxygen flow rate,smelting temperature and ω(Fe)/ω(SiO_(2)) and ω(CaO)/ω(SiO_(2)) on the desulfurization rate of co-smelting process were studied by single-factor experiments.The physical phase changes of smelting slag with different compositions were analyzed by XRD mapping.The results showed that the increase of oxygen flow rate and temperature could improve the desulfurization rate,and when the reaction temperature was 1 200 ℃ and the ω(Fe)/ω(SiO_(2)) was between 0.6 and 0.97,the desulfurization rate was above 95% after 25 minutes of reaction.When the ω(Fe)/ω(SiO_(2)) was higher than 0.97,the spinel phase appeared in the slag,the viscosity of slag increased and the desulfurization rate decreased.The ω(CaO)/ω(SiO_(2)) increased from 0.22 to 0.87,and the slag desulfurization rate increased first and then decreased.With the ω(CaO)/ω(SiO_(2)) ratio of 0.49,the desulfurization effect was better,with the content of sulfur in the final slag reduced to 0.61%,and desulfurization rate reaching 96.99%.The study could provide reference for lead smelting and recovery.