硫酸铅沉淀回收水中六价铬的行为研究  

Precipitation Process of Cr(Ⅵ) with Lead Sulfate

作　　者：彭浩 刘作华[2] 陶长元[2] 

机构地区：[1]长江师范学院化学化工学院,重庆408102 [2]重庆大学化学化工学院,重庆400030

出　　处：《中国锰业》2017年第6期136-139,共4页China Manganese Industry

基　　金：国家科技支撑计划项目(2015BAB17B00);国家自然科学基金(51274261)

摘　　要：根据铬酸铅和硫酸铅的溶度积差异,用硫酸铅作为沉淀剂来分离回收溶液中的铬酸根。实验研究了反应温度、反应时间、溶液pH值以及硫酸铅用量对铬酸根沉淀率的影响。研究表明溶液pH值和硫酸铅用量对沉铬率影响较大,反应温度和反应时间几乎没影响。当溶液pH值为14.14,n(硫酸铅)/n(铬酸根)=4∶1时,沉铬率可达99.89%。继续增大硫酸铅用量,沉铬率接近100%,且硫酸铅的使用不会造成二次污染。Lead sulfate was used as a precipitation agent to recover and separate chromate from the solution according the difference of solubility products when compared with lead chromate. The effects of parameters on the precipitation efficiency of chromium,including reaction temperature,reaction time,solution pH and dosage of lead sulfate,were studied. The results show that the solution pH and dosage of lead sulfate will be of big influence while reaction time and reaction temperature is little. The precipitation efficiency of chromium was 99. 89% when the solution pH was 14. 1. Dosage of lead sulfate with n（ lead sulfate）/n（ chromate） = 4 ∶ 1. The precipitation efficiency of chromium is nearly 100% with the increasing of dosage of lead sulfate. Otherwise,the using of lead sulfate will not cause secondary pollution.

关 键 词：硫酸铅 重铬酸钾 沉淀 铬酸铅 

分 类 号：X781[环境科学与工程—环境工程]