改性黏土的制备及吸附Zn^(2+)的研究  

Fabrication of modified clay and its Zn^(2+) adsorption

作　　者：王海宁[1] 潘方明[1] 肖前斌[1] 

机构地区：[1]江西理工大学资源与环境工程学院,江西赣州341000

出　　处：《有色金属科学与工程》2012年第5期30-33,共4页Nonferrous Metals Science and Engineering

摘　　要：实验室对富镁纤维状硅酸盐黏土进行酸改性和钾盐活化处理,并与聚合羟基铁离子进行聚合反应,制备了一种新型黏土复合絮凝剂.对重金属离子Zn2+的吸附性能试验结果表明:pH值对复合絮凝剂吸附Zn2+影响很大,当pH<2时,Zn2+去除率只有20%左右,当pH>6时,Zn2+去除率达到95%;初始浓度对Zn2+的去除率影响较大,去除率随着初始浓度的上升而下降;而温度、絮凝剂投加量对Zn2+去除率影响相对较小.改性后黏土矿物对Zn2+有较强的去除能力,常温下,当pH为6～8、投加量为0.3 g、500 r/min转速条件下快速搅拌5 min、100 r/min转速条件下慢速搅拌10 min、静置60 min时,Zn2+的去除率可达95%,该方法工艺简单且无二次污染.A novel compound flocculants was prepared by conducting polymerization reaction with the polymerization of hydroxy-Fe after acid modification and potassium activation processing of magnesium- rich fibrous silicate clay. The results of adsorption performance test of Zn2＋ showed that the adsorption abilities were obviously affected by pH value of solution. The removal rate of Zn2~ is about 20 % when pH〈 2. It reaches 95 % when pH〉6. The removal rate of Zn2＋ declines with rising initial concentration. Temperature and amount of sorbent affects little on the removal rate. The clay mineral has stronger ability on Zn2＋ removal after modification. Under room temperature, when pH value was within the range of 6-8 with 0.3 g dosage, stirred 5 min when the stirring frequency was 500 r/min, then stirred l0 min when the stirring frequency was 100 r/min, the removal rates of Zn2＋ were up to 95 % after 60 min holding. The method was simple without secondary pollution.

关 键 词：黏土 复合絮凝剂 聚合羟基铁 制备 

分 类 号：TF111.3[冶金工程—冶金物理化学]