高岭土还原络合漂白工艺中络合剂的选择  

Selection of Complexing Agent for Technology of Reducting and Complexing Bleach of Kaolin

作　　者：夏光华[1] 王振华[1] 苏小丽[1] 

机构地区：[1]景德镇陶瓷学院材料科学与工程学院,景德镇333001

出　　处：《硅酸盐通报》2011年第2期331-335,共5页Bulletin of the Chinese Ceramic Society

基　　金：科技部中小企业创新基金项目(06C26213601348)

摘　　要：以广西北海地区高岭土为原料,二氧化硫脲为还原剂,选取几种不同种类的络合剂(腐植酸,三乙醇胺,三聚磷酸钠,柠檬酸和EDTA),考察了它们在高岭土还原络合漂白工艺中的络合作用。结果表明:不加络合剂的空白试验可使漂白后高岭土的煅烧白度由83%增加到86%。加入络合剂后对漂白均起到了强化效果,其中腐植酸,三乙醇胺,EDTA在用量为0.3%时,可使漂白后高岭土的煅烧白度达到88%。三乙醇胺在投加量为0.5%,矿浆pH值为7.5,矿浆浓度为20%,反应时间为1 h时,可使漂白后高岭土的煅烧白度达到89%左右。Using the Beihai kaolin as raw material,thiourea dioxide as reducing agent,selected several different kinds of complexing agents（humic acid,triethanolamine,sodium tripolyphosphate,citric acid and EDTA）,investigated the complexation under different conditions on reducting and complexing bleach of kaolin.The results showed that the whiteness after calcination（1200 ℃） of kaolin after the blank experiments increased from 83% to about 86%.All complexing agent can strengthen the bleaching in this experiments,the humic acid,triethanolamine,EDTA achieved better effectiveness,when the dosage is 0.3%,the whiteness after calcination（1200 ℃） of kaolin after the bleaching increased up to 88%.In the united optimum conditions,that is,the dosage of triethanolamine 0.5%,pH value of slurry 7.5,pulp density 20%,reaction time 1h,the whiteness after calcination（1200 ℃） of kaolin increased up to 89%.

关 键 词：高岭土 还原漂白 络合剂 

分 类 号：TD926[矿业工程—选矿]