Leaching of Various Elements in Converter Steel Slag with Mixed Acid
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 65 μm,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.
万方数据
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