高铁低铝煤矸石中酸浸溶出实验研究

研究以高铁、低铝煤矸石为原料,不用热活化处理直接酸浸提取铝、铁、钛,结果表明:随着反应温度、液固比和时间的增加,铝、铁、钛溶出率总体呈上升趋势,当硫酸质量分数超过65%时,铝、铁溶出率下降,钛溶出率继续增加;通过酸质量分数、液固比、温度和反应时间4个因素的考察,得到了各因素对煤矸石中铝铁钛溶出率的影响规律,确定了最适宜的浸出条件为:酸质量分数65%,液固比3,温度115℃,时间4 h,此条件下铝、铁、钛的溶出率分别达到88.86%,91.37%和70.75%。

Experimental study on acid leaching from high-iron and low-aluminum coal gangue

With high-iron and low-aluminum coal gangue as raw material,the research of directly extracting aluminum,iron,titanium in acid leaching without hot-activation treatment was performed.The results show that the dissolution rate of aluminum,iron,and titanium overall rises with the increases of reaction temperature,the liquid-solid ratio and the time,but the dissolution rate of aluminum and iron decreases when sulfuric acid mass fraction exceeds 65%,titanium dissolution rate continues to increase.Through the investigation on four influence factors such as the mass fraction of acid,the liquid-solid ratio,temperature and reaction time,the influence law of each factor to the dissolution rate of aluminum,iron and titanium was obtained.Under the most suitable operating conditions of acid mass fraction 65%,liquid-solid ratio 3,temperature 115 ℃,time 4 h,the dissolution rates of aluminum,iron and titanium reach 88.86%,91.37% and 70.75% respectively.