【摘要】 采用硫酸作酸浸剂、Na2S2O4作还原剂的方法对高岭土进行了除铁增白实验,考察硫酸的质量分数、温度、浸出时间、Na2S2O4的用量、草酸用量等因素对除铁增白效果的影响,得出最佳除铁增白方案。最佳除铁增白方案为:在矿浆中高岭土与水的质量比为20∶100时,硫酸的质量分数为20%、温度为80℃、浸出时间为2h、Na2S2O4用量为0.5g、草酸用量为1.0g。经除铁增白后,高岭土中的Fe2O3的质量分数由原来的2.098%降为0.35%,白度由原来的56.4%提高到81.5%。更多还原

【Abstract】 The iron removal and bleaching experiment on kaolin was made by the method of vitriol as soaking agent and Na2S2O4 as reducer. The factors that influenced iron removal and bleaching result were investigated, including sulfuric acid concentration, temperature, soaking time, dosage of Na2S2O4, dosage of oxalic acid, and so on. The best iron removal and bleaching project was worked out. When the mass ratio of kaolin and water was 20∶100 , the mass fraction of sulfuric acid was 20%, temperature was 80 ℃, soaking time was 2 h, dosage of Na2S2O4 was 0.5 g and dosage of oxalic acid was 1.0 g. After iron removal and bleaching, the mass fraction of Fe2O3 in kaolin was dropped from 2.098% to 0.35% and the kaolin whiteness was increased from 56.4% to 81.5%.更多还原