煤泥伴生高岭土提纯与增白试验研究

针对河北唐山地区选煤厂浮选尾煤中煤系高岭土含量高,采用φ150 mm、φ75 mm、φ50 mm、φ10 mm的小锥角水力旋流器组提纯煤泥伴生高岭土,φ10 mm溢流产品中Al2O3含量富集到36.91%。通过磁选、化学漂白、煅烧等工艺对煤泥伴生高岭土进行增白试验,结果表明选用提纯-弱磁-高梯度磁选-化学漂白-煅烧工艺流程,产品煅烧后白度可达到92.87%,满足造纸工业用煅烧高岭土白度要求。

Experimental Study on Purifying and Whitening of Coal Slime Associated Kaolin

According to coal flotation tailings with high content kaolin of a coal preparation plant from Tangshan Hebei area, coal slime associated Kaolin was purified by the small taper angle hydrocyclone group installed in series of φ150 mm, φ75 mm, φ50 mm an dφ10 mm. The Al2O3 content of φ10 mm overflow was enriched in 36.01%. The whitening experiment of coal slime associated kaolin was conducted by magnetic separation, chemical bleaching, calcination technology. The result shows that the whiteness of production after calcination increased to 92.87% by the process of purification - low intensity magnetic separation - high-gradient magnetic separation - chemical bleaching - calcination. It reached the whiteness standard of calcined kaolin with paper manufacturing industry.