摘要
本文以含Ｃｒ^（６＋）废水为原料，对Ｃｒ_２Ｏ_３的制备方法进行研究，对其还原反应的酸度，还原剂用量，沉淀ｐＨ值进行选择。采用尿素除铁，Ｎａ_２ＳＯ_３还原，ＮａＯＨ沉淀等步骤，所得产品Ｃｒ_２Ｏ_３（铬绿）纯度达９７．０５％，产率８１．２０％，质量符合化工行业合格品标准．同时获得副产品Ｎａ_２ＳＯ_４，纯度达９５．０１％．
The preparation of Cr_2O3_ from wastewater bearing Cr(Ⅵ)was studied. The pH of reduction reaction, the dosage of reducing agent, and the PH of precipitating Cr(OH)_3 were examined. The product Cr_2O_3 was made by removing Fe(Ⅲ)with urea, reducing Cr(Ⅵ) with Na_2SO_3, and precipitating Cr(OH)_3. The purity of the product is 97.05%, and the yield is 81.02%. Its quality can meet the chemical industry criterion. At same time the by-product Na_2SO_4 was obtained, whose purity came up to 95.01 %
出处
《有色金属》
CSCD
2000年第2期75-76,79,共3页
Nonferrous Metals
