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当前国内、外大多采用重选、磁选、化学漂白等工艺流程来精制高岭土。高梯度磁选、超导、氨浸、絮凝和液——液提取等方法,尚处在试验研究阶段。本文拟就某地高岭土采用选择性絮凝法分离其中明矾石作一探讨。方法是将高岭土试样在40%的浓度下,添加分散剂水玻璃充分分散,排除粗粒、重粒,然后,在18%的浓度下,边搅拌边缓慢加入絮凝剂聚丙烯酰胺,使高岭土呈絮团状下沉;此时,明矾石仍呈悬浮状态,便可从高岭土中分离出去。试验结果:高岭土产率(精矿,%)54.2;含(%)SO_30.12,SiO_245.86,Al_2O_337.56;耐火度1770℃;白度达75%。
At present, most domestic and foreign re-election, magnetic separation, chemical bleaching process to refining kaolin. High gradient magnetic separation, superconductivity, ammonia leaching, flocculation and liquid-liquid extraction methods are still in the experimental phase. This paper intends to use a selective flocculation of kaolin separation of which alum for a discussion. The method is that the kaolin sample is added with 40% of dispersant, water glass is fully dispersed to remove the coarse particles and heavy particles, and then, at the concentration of 18%, while slowly adding the flocculant polyacrylamide with stirring, the kaolin Was flocculent sinking; At this point, alum is still suspended in the state, they can be separated from the kaolin. Test results: kaolin yield (concentrate,%) 54.2; containing (%) SO_30.12, SiO_245.86, Al_2O_337.56; refractoriness 1770 ℃; whiteness of 75%.