混合酸浸出转炉钢渣中各元素的试验研究

Leaching of Various Elements in Converter Steel Slag with Mixed Acid

为促进钢渣中有价资源的回收利用,研究了转炉钢渣中各元素在混合酸(枸橼酸+硝酸)体系中的浸出行为,考察了混合酸浓度、浸出时间、浸出温度、液固体积质量比及渣样粒径等对各有价元素浸出率的影响。结果表明:酸浓度、反应时间、液固体积质量比、渣样粒径对钙、镁、铁、锰、磷浸出率有较大影响,反应温度对各元素浸出率的影响不大;在钢渣粒径65μm、浸出温度298 K、浸出时间30 min、液固体积质量比300∶1、搅拌速度800 r/min条件下,用0.01 mol/L硝酸+20.8 mmol/L枸橼酸浸出钢渣,磷浸出率为88.15%,磷可得到有效浸出。

In order to promote the recovery and utilization of valuable resources in steel slag,the leaching behavior of each element in converter steel slag in mixed acid(citric acid+nitric acid)system was studied.The effects of mixed acid concentration,reaction time,reaction temperature,liquid volume to solid mass ratio,and slag particle size on the leaching rate of each valuable element were examined.The results show that acid concentration,reaction time,liquid volume to solid mass ratio,and slag particle size have significant impact on the leaching rate of calcium,magnesium,iron,manganese and phosphorus.The reaction temperature has little effect on the leaching rate of each element.Under the conditions of steel slag particle size of 65μm,leaching temperature of 298 K,leaching time of 30 min,liquid volume to solid mass ratio of 300∶1 and stirring speed of 800 r/min,the leaching rate of phosphorus is 88.15%with 0.01 mol/L nitric acid and 20.8 mmol/L citric acid.And effective leaching of phosphorus is obtained.