Effect of modified starches on depression of diaspore  

作　　者：李海普 张莎莎 蒋昊 李彬 

机构地区：[1]School of Chemistry and Chemical Engineering,Central South University [2]School of Minerals Processing and Bioengineering,Central South University

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第8期1494-1499,共6页中国有色金属学报（英文版）

基　　金：Projects(50804055,50974134) supported by the National Natural Science Foundation of China;Project(09JJ3100) supported by Hunan Provincial Natural Science Foundation,China

摘　　要：Four modified starches with selected charge characteristics including cationic starch(CAS),carboxymethyl starch(CMS),amphoteric starch(AMS) and soluble starch(SS) were investigated as depressants for diaspore in reverse flotation test using cationic collector(dodecylamine).Adsorption examination,Zeta potential measurement and Fourier transform infrared(FTIR) spectroscopy were used to clarify the role of the surface charge characteristics of starches in determining the adsorption behavior and depression performance as well as the mineral-starch interaction.Results show that the positively charged starches(CAS and AMS) display higher adsorption amounts and also better depression performance compared with the non-ionic(SS) and anionic starch(CMS),benefiting from the favorable electrostatic attraction with diaspore and also electrostatic repulsion with collector.FTIR spectroscopy proves the presence of hydrogen bonds and chemical complexation between mineral and starches in an integrated manner.Four modified starches with selected charge characteristics including cationic starch （CAS）, carboxymethyl starch （CMS）, amphoteric starch （AMS） and soluble starch （SS） were investigated as depressants for diaspore in reverse flotation test using cationic collector （dodecylamine）. Adsorption examination, Zeta potential measurement and Fourier transform infrared （FTIR） spectroscopy were used to clarify the role of the surface charge characteristics of starches in determining the adsorption behavior and depression performance as well as the mineral-starch interaction. Results show that the positively charged starches （CAS and AMS） display higher adsorption amounts and also better depression performance compared with the non-ionic （SS） and anionic starch （CMS）, benefiting from the favorable electrostatic attraction with diaspore and also electrostatic repulsion with collector. FTIR spectroscopy proves the presence of hydrogen bonds and chemical complexation between mineral and starches in an integrated manner.

关 键 词：STARCH DIASPORE reverse flotation depressant 

分 类 号：TS236.9[轻工技术与工程—粮食、油脂及植物蛋白工程] R749.4[轻工技术与工程—食品科学与工程]