高岭土选择性活化-絮凝提纯试验

Purification of kaolin by selective activation-flocculation method

为去除高岭石中的细粒铁、钛类矿物杂质,提高高岭土的品质和应用价值.采用选择性活化-絮凝的方法,对高岭土进行提纯,研究了油酸钠、聚丙烯酰胺对提纯效果的影响,揭示了铁钛矿物选择活化和性絮凝的机理.结果表明:油酸钠显著提高了高岭土选择性絮凝提纯效果,并且在聚丙烯酰胺分子量1300万、用量0.01%,油酸钠用量0.15%时,高岭土的白度由74.1%提高到80.2%.能谱分析表明高岭土中铁、钛类氧化物质量分数由分选前的1.37%和1.52%分别降低到0.45%和0.68%.研究结果对其他粘土类矿物的提纯和细粒铁钛类矿物的分选也具有一定的指导意义.

In order to remove the finely associated titanous and ferrous impurities and improve the grade and application of kaolin, this paper proposed a novel selective activation-flocculation method for the kaolin purification. The effect of sodium oleate and polyacrylamide for the beneficiation was studied. The mechanism of selective activation-flocculation of titanous and ferrous minerals was revealed. The results show that sodium oleate dramatically improved the purification of kaolin by selective flocculation. The best condition was as follows: the molecular weight of polyacrylamide was 12 million; the dosages of polyacrylamide and sodium oleate were 0.01% and 0.15% respectively. After selective activation-flocculation treatment, the whiteness was increased from the 74.1% to 80.2%. The energy spectrum analysis revealed that the iron and titanous oxide content were separately decreased to 0.45% and 0.68% from 1.37% and 1.52% of the raw kaolin. This technique is expected to be useful for the purification of other kind of clay and the beneficiation of the fine titanous and ferrous minerals.