摘要
铬盐的工业生产过程中会产生大量铬渣,铬渣中残留的Cr(Ⅵ)和Cr(Ⅲ)存在“返黄”的风险,不仅污染生态环境,而且造成了铬资源的浪费.为此,提出了在水热高压反应釜的酸性环境条件下,利用软锰矿中的MnO_(2)将铬渣中残留的Cr(Ⅲ)氧化为Cr(Ⅵ)方法,浸出并回收锰和铬,从而根除铬渣的“返黄”风险.结果表明:在反应温度150℃、反应时间1.5 h、铬渣与软锰矿质量比为1∶1、固液比1∶20、硫酸浓度3.0 mol‧L^(-1)条件下Cr(Ⅵ)的浸出率达到100%,锰的浸出率为89.15%.在此条件下解毒渣中剩余总铬浸出浓度低于ICP检出限(1μg‧L^(-1)),Cr(Ⅵ)和总铬的含量达到国家标准(GB 5085.3—2007),为铬渣的解毒和资源化利用以及软锰矿的有效浸出提供了一条新的途径.
The industrial production of chromium salt generates a large amount of chromite ore processing residue(COPR).The residual Cr(Ⅵ)and Cr(Ⅲ)in COPR not only pose the risk of“re-yellowing”and polluting the ecological environment,but also cause waste of chromium resources.Herein MnO_(2) in pyrolusite was utilized to oxidize the residual Cr(Ⅲ)in chromium residue to Cr(Ⅵ)under acidic condition,then recover manganese and chromium through leaching to eradicate the risk of“re-yellowing”of COPR.The results indicated that the leaching rate of Cr(Ⅵ)reached 100%and Mn 89.15%under reaction temperature of 150°C,reaction time of 1.5 h,mass ratio of COPR to pyrolusite of 1∶1,solid-liquid ratio of 1∶20,and 3 mol‧L^(-1) of sulfuric acid.The leaching concentration of the remaining total chromium in the detoxified slag under such conditions was lower than the ICP detection limit(1μg‧L^(-1)),and the contents of Cr(Ⅵ)and total chromium met the national standard(GB 5085.3—2007),which provided a new way for detoxification and resource utilization of COPR as well as effective leaching of pyrolusite.
作者
谢雅骐
汪岚玢
杜亚光
XIE Yaqi;WANG Lanbin;DU Yaguang(South-Central Minzu University,College of Resources and Environment,Wuhan 430074,China;South-Central Minzu University,State People's Committee Key Laboratory of Resource Conversion and Pollution Control,Wuhan 430074,China)
出处
《中南民族大学学报（自然科学版）》
CAS
2024年第1期16-23,共8页
Journal of South-Central University for Nationalities：Natural Science Edition
基金
国家自然科学基金资助项目(52100206)。
关键词
铬渣
软锰矿
解毒
水热
资源化
chromite ore processing residue
pyrolusite
detoxification
hydrothermal
resource extraction
