煤系高岭岩制取超细氧化铝的试验研究  

Experimental Research on the Preparation of Ultra-fine Alumina from Kaolinite in Coal Measures

作　　者：薛茹君[1,2] 陈晓玲[1] 吴玉程[2] 

机构地区：[1]安徽理工大学化工学院,安徽淮南232001 [2]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《矿产综合利用》2009年第1期19-23,共5页Multipurpose Utilization of Mineral Resources

基　　金：安徽省教育厅基金项目(2006kj113B)

摘　　要：煤系高岭岩酸浸得到硫酸铝溶液,再采用N1923-P507混合萃取剂除铁、活性炭过滤除硅、共沉淀制取AACH结晶、热解煅烧等步骤,制得高纯超细氧化铝。讨论了用N1923-P507混合萃取剂进行三级逆流萃取时,水相pH值及萃取时间等操作条件对萃铁效果的影响;用TG-DTA研究了前驱物的热解特性,用XRD、TEM表征了AACH及其煅烧产物的物相及粒径;用ICP测定了煅烧产物的纯度。分析结果表明,铁的萃取率达到99.2%;AACH的纯度满足制取高纯超细A l2O3的要求;产品为粒径<70nm、纯度>99.95%的A l2O3。The AI2 （ SO4 ） 3 crude solution was obtained from kaolinite in coal - measures by acid leach. Then the processing technologies such as extracting -iron with the mixed extractant N1923 -P507 ,filtering to desilication with activated carbon, co - precipitation to synthesize AACH crystal, and thermal decomposition calcination, etc were carried out to prepare high purity and ultra - fine alumina. The influence of the pH value of the aqueous phase and the extracting time on extracting - iron efficiency was discussed when three - stage counter - flow extraction with the mixed extractant was carried out. Thermal decomposition property was studied by TG - DTA. The phase and the particle size of the precursor and its calcination products were characterized by XRD and TEM. The purity of the ultra - fine alumina was determined by ICP. The analysis results shows that the extraction yield of iron is 99.2%. The purity of AACH satisfies the demand of preparing high purity and ultra - fine alumina, and the product is of a 70nm particle size,99.95% purity alumina.

关 键 词：煤系高岭土 超细氧化铝 萃取除铁 AACH 

分 类 号：TD985[矿业工程—选矿] TF123[冶金工程—粉末冶金]