摘要
目前铬渣处理所用的大部分方法都存在铬形态不稳定、残留的酸溶性Cr(Ⅵ)易洗出等问题。该研究通过在合成偏高岭土基矿物聚合物中添加铬渣和还原剂硫化钠,一步法还原六价铬和固定铬渣。实验中,在矿物聚合物原料配比的基础上,保持S2-/Cr(Ⅵ)的比例不变,添加铬渣及硫化钠溶液,得到偏高岭土/铬渣基矿物聚合物。通过偏高岭土-铬渣基矿物聚合物固化体中铬的浸出性毒性及其抗压强度测试,探索铬渣的最大处理量。
At present,there exist problems in common methods for treatment of chromium residue such as unstable chromium morphology and easy leaching out of acid Cr(Ⅵ)from the residual chromium.In this paper,an experiment was carried out for the purpose of more reliable immobilization of chromium residue and reduction of Cr(Ⅵ)and strengthening chromium residue treatment capacity,which included the one-step preparation of metakaolin-based geopolymer by adding in chromium residue and Na2 S as a reducing agent.Metakaolin/chromium residue-based geopolymer was obtained by adding chromium residue and sodium sulfide solution and the constant S2-/Cr(Ⅵ)ratio on the basis of raw material ratio was being maintained,then the testing to detect leaching toxicity of chromium and compression strength of the prepared geopolymer was conducted.As a result,the maximum treatment capacity for immobilization of chromium residue was determined.
作者
刘明阳
陈立
董秋花
熊晶
贺小敏
宋国强
陈洁渝
LIU Mingyang;CHEN Li;DONG Qiuhua;XIONG Jing;HE Xiaomin;SONG Guoqiang;CHEN Jieyu(Hubei Environmental Monitoring Centre,Wuhan 430072,China;Administrative Licensing Technology Review Center,Hubei Provincial Market Supervision Administration,Wuhan 430068,China;Wuhan Food and Cosmetics Inspection Institute,Wuhan 430014,China;China University of Geosciences(Wuhan),Wuhan 430072,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2020年第8期152-155,共4页
Environmental Science & Technology
基金
湖北省土壤风险评估成因研究(鄂财建发[2017]12号)。
关键词
矿物聚合物
铬渣
偏高岭土
浓度
geopolymer
chromium residue
metakaolin
concentration
