铬革屑的酸碱联合处理中CaO脱铬的优化  

Optimization of CaO Dechromization in Acid-base Combined Treatment of Chrome Shavings

作　　者：赵胜宗 刘彦[1,2] ZHAO Shengzong;LIU Yan(Department of Biomass and Leather Engineering,Sichuan University,Chengdu 610065,China;National Engineering Laboratory for Clean Technology of Leather Manufacture,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学生物质与皮革工程系,四川成都610065 [2]四川大学制革清洁技术国家工程实验室,四川成都610065

出　　处：《皮革科学与工程》2020年第1期17-22,共6页Leather Science and Engineering

摘　　要：本研究采用氧化钙对铬革屑进行脱铬处理,并对氧化钙脱铬处理的各项参数进行了优化,以达到在脱铬的同时,尽可能地减少铬革屑水解的目的。通过单因素实验,确定了各因素的最佳条件为:碱处理时间20 h,碱用量10%,碱浓度11 g/L;再通过正交实验的结果分析,得到氧化钙脱铬处理的最优工艺为:碱处理时间12 h、碱用量10%、碱浓度9 g/L和碱处理温度25℃。在最优工艺条件下对铬革屑进行处理后,铬革屑的铬含量为1.476 mg/g,比起始铬含量降低了94.38%,其水解率仅为14.01%。In this study,the chrome shavings were dechromed by CaO,and the parameters of CaO dechroming were optimized to reduce the hydrolysis of chrome shavings as less as possible while dechroming.The single factor experiments showed that the optimal conditions for each factor were alkali treatment time 20 h,alkali dosage 10%,alkali concentration 11 g/L;and the orthogonal experiment results indicated that the optimal process for CaO dechroming was alkali treatment time 12 h,alkali dosage 10%,alkali concentration 9 g/L,and alkali treatment temperature 25℃.The chrome shavings have a chromium content of 1.476 mg/g,which was 94.38% lower than the initial chromium content,and the hydrolysis rate was only 14.01% by the optimal dechroming process.

关 键 词：铬革屑 脱铬 CaO处理 正交实验 

分 类 号：X794[环境科学与工程—环境工程]