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传统火法冶金工艺可将PbO2直接还原为铅，然而这需要高温条件且易产生铅挥发等问题。湿法冶金虽可在低温下高效地将PbO2还原为二价铅化合物，但需要消耗较多的强酸和还原试剂。提出了一种PbO2绿色转化的方法，利用(NH4)_2SO4在低温下分解成NH_4HSO4将PbO2还原为PbSO4。结果表明，NH_4HSO4和PbO2反应过程会生成中间产物Pb(NH4)2(SO4)2。废铅膏与(NH4)_2SO4反应的最佳条件为：摩尔比n(SO42-)/n(TPb)=1、焙烧温度340℃、焙烧时间1.5 h,在该条件下PbO2的还原率为96.64%,焙烧产物的PbSO4含量为96.38%。
Abstract：Conventional pyrometallurgical processes can directly reduce PbO2 directly to lead, however, this requires high temperature conditions and is easy to cause problems such as lead volatilization. Although hydrometallurgy can efficiently reduce PbO2 to divalent lead compounds at low temperatures, it requires the consumption of strong acids and reduction reagents. A green conversion method of PbO2 was proposed, which utilized(NH4)_2SO4 decompose into NH_4HSO4 at low temperatures to reduce PbO2 to PbSO4. The results indicate that the reaction process between NH_4HSO4 and PbO2 will generate the intermediate product Pb(NH4)2(SO4)2. The reduction rate of PbO2 is 96.64%,and PbSO4 content of the roasting product is 96.38% under the optimum conditions for the reaction of spent lead paste with(NH4)_2SO4 including molar ratio of n(SO42-)/n(TPb)=1,roasting temperature of 340 ℃,and roasting time of 1.5 h.
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基本信息:
中图分类号:TF046
引用信息:
[1]陈章庆,黄魁,董海丽,等.低温焙烧法还原废铅膏中PbO_2的研究[J].有色金属(冶炼部分),2024(02):16-22.
基金信息:
国家自然科学基金资助项目(21767003)
2024-01-17
2024-01-17