某高岭土矿石中黄铁矿的分选试验

Separation Experiment of Pyrite in a Certain Kaolin Ore

某高岭土矿石中高岭石含量为79.82%,黄铁矿含量达18.14%,杂质矿物含量仅2.06%。为消除黄铁矿对高岭土质量的影响,同时使黄铁矿得到综合利用,对该矿石进行了实验室浮硫试验。试验针对矿石中高岭石易泥化且黄铁矿嵌布粒度较细的特点,采用实验室仿闭路磨矿方式对原矿进行细磨,既可将原矿磨至-0.043 mm占95.37%从而使黄铁矿得以充分解离,又可减轻高岭石泥化对浮硫过程形成的干扰;然后以酸化水玻璃为高岭石的分散、抑制剂,以丁黄药为黄铁矿的捕收剂,通过闭路1次粗选、2次精选、2次扫选,获得了硫品位为48.77%、硫回收率为87.30%的高品质硫精矿,而浮硫槽内产品可直接作为高岭土精矿用于低档陶瓷原料。

There are 79.82% of kaolinite, 18.14% of pyrite and only 2.06% of impurities in a certain kaolin ore. To eliminate the effects of pyrite on kaolin, and realize comprehensive utilization of pyrite, laboratory ：tests of sulfur flotation are carried out. According to the characteristics that the kaolin is easy sliming and the particles size of pyrite is small, the imitating closed-circuit grinding was adopted in the laboratory to get fine grinding for the raw ores. The results showed that under grinding fineness of about -0.043 mm 95%, the pyrite was fully dissociated, and the interference of kaolin sliming to the sulfur flotation process was reduced. With acidic sodium silicate as dispersant of kaolinite, butyl xanthate as collector of pyrite, sulfur concentrate with S grade of 48.77% and S recovery of 87.30% was obtained by adopting the closed-circuit flotation flowsheet of one roughing, two-cleaning and two-scavenging. And the products left in sulfur flotation tank, kaolin concentrate, can be directly used as low-grade ceramics raw material.