Effects of water hardness on selective flocculation of diasporic bauxite  

水的硬度对铝土矿选择性絮凝的影响(英文)

作　　者：刘文莉[1] 孙伟[1] 胡岳华[1] 

机构地区：[1]中南大学资源加工与生物工程学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第9期2248-2254,共7页中国有色金属学报（英文版）

基　　金：Project (2005CB623701) supported by the National Basic Research Program of China

摘　　要：The effect of electrolyte on settling behavior of kaolinite was studied. Effects of hard water on selective flocculation of diasporic bauxite was tested and the measures were taken to eliminate the effects of Ca2＋ and Mg2＋ in hard water. The results indicated that, not only the concentration of electrolyte ions but also the ionic valence of the electrolyte ions affects the settling behavior of kaolinite; hard water significantly affects its selective flocculation owing to Ca2＋ and Mg2＋; general dispersants could not eliminate the effects of Ca2＋ and Mg2＋. Self-made softening agent in our lab could weaken or eliminate the effects of hard water on flocculation processes. The results of molecular dynamics simulation show that softening agent molecules could restrict Ca2＋ and prevent them from playing their roles, so as to eliminate the effects. The continuous pilot experiment results of bauxite flocculation were even better than those obtained in laboratory.通过絮凝实验和分子动力学模拟的方法,研究硬水中Ca2+、Mg2+离子对铝土矿选择性絮凝的影响。果表明:除了电解质浓度,电解质离子的价态也对选择性絮凝产生影响;硬水中的Ca2+和Mg2+离子显著地选絮凝,且普通的分散剂不能减弱这些影响。实验室自制的软水剂可以削弱甚至消除这些影响。分子动力学模拟果显示,软水剂可以限制Ca2+,防止他们发生作用,因此可以消除影响。铝土矿连续絮凝实验结果好于实验室验结果。

关 键 词：softening agent hard water BAUXITE DISPERSANT FLOCCULATION 

分 类 号：TD98[矿业工程—选矿]