吉林临江低品位硅藻土反浮选提纯研究

Purification of a Low-grade Diatomite from Linjiang in Jilin by Reverse Flotation

吉林临江低品位硅藻土为高烧失三级硅藻土,其中的硅藻以圆筛藻为主,有少量直链藻,脉石矿物主要为石英和钠长石。为了提高该硅藻土的品级,同时又克服擦洗、酸浸、焙烧等常规硅藻土提纯方法所存在的生产周期长、耗酸和耗水量大、能耗高、污染环境等缺陷,对其进行了反浮选试验。结果表明,在温度为40℃、氢氧化钠调pH为8的矿浆环境中,以焦磷酸钠为分散剂、十二胺为捕收剂,只需经过1次粗选、2次精选,即可获得SiO2品位为79.39%、Al2O3含量为4.92%、SiO2回收率为45.00%,质量达到二级硅藻土标准的硅藻土精矿。该试验结果不仅证实了反浮选工艺对硅藻土提纯的有效性,同时显示了反浮选工艺在生产效率、耗酸、耗水、耗能及环境污染等方面与常规硅藻土提纯工艺相比所具有的优越性。

The low-grade diatomite of Linjiang,in Jilin Province is grade-three diatomite with high burning loss.The diatom of low-grade diatomite that mainly composed of coscinodiscus and a small amount of melosira,and gangue minerals are mainly quartz and albite.In order to improve the grade of diatomite and solve the existing problems such as long production cycle,high energy consumption and high water consumption,high consumption of acid,environmental pollution.For the first time,the reverse flotation behavior of low-grade diatomite was studied.The results indicated that under the conditions of flotation for purification pH 8,temperature of pulp of 40 ℃,sodinm pyrophosphate dose as dispersion solvent,lurylamine dose as collector,and through the floatation process of one roughing and two cleaning,diatomite concentrate with the grade of SiO2 79.39％,the grade of Al2O3 4.92％,the recovery rate of SiO2 5.00％ was obtained,which reaches the standard of the secondary diatomite.Not only did the results confirm that the effectiveness of the reverse flotation for low-grade diatomite purification,also this method has many advantages,such as short production cycle,low energy consumption,low consumption of acid,low water consumption,and less environmental contaminating.