浮选法对非晶微硅粉提纯效果的研究

Study on the effects of purification of noncrystalline micro silica powder using flotation process

为确定效果最优的纳米石英浮选工艺条件,采用浮选法对微硅粉分离提纯,考察了捕收剂用量、不同金属阳离子活化剂种类、矿浆pH值、搅拌强度、引入纳米气泡等条件对纳米石英提纯效果的影响。结果表明:在浮选机转速为2000 r/min、矿浆pH值为12、捕收剂(油酸钠)用量为1.5 g/L、活化剂(CaCl_(2))用量为5×10^(-3)mol/L条件下,纳米石英的回收率可达到70.2%,品位可达93.45%。将纳米气泡发生器与浮选机联合使用组成矿浆循环系统,使矿浆中充满纳米气泡,在相同试验条件下,纳米石英回收率比使用去离子水时提高了9.7个百分点,表明引入纳米气泡提高了气泡和微细矿物颗粒间的碰撞和附着概率,对浮选效果有一定的改善。

Micro silica powder is separated and purified using flotation process.In order to define the op-timum nano quartz flotation conditions,a study is made of the effects on purification of the material pro-duced by dosage of collector,different kinds of metal cationic activators,pH value of pulp,agitating in-tensity,introduction of nano bubbles,etc.Test results indicate that with the flotation machine working at a speed of 2,000 r/min,a pH value of 12,a collector dosage of 1.5 g/L,and a dosage of activator(CaCl_(2))of 5×10^(-3)mol/L,the recovery and grade of nano quartz are as high as 70.2%and 93.45%respectively.In the case of using a nano bubble generator-flotation machine integrated pulp circulation system to enable the pulp to be sufficiently aerated with nano bubbles,under otherwise identical condi-tions,the recovery of nano quartz is 9.7 percentage points higher than the case of using deionized water.It well demonstrates that introduction of nano bubbles can help improve to a certain extent flotation effect because of increased bubble-fine particle and interparticle collision and adhesion probability.