Abstract：In China,the steel slag production is large and stocks are high. Although hot recycling has been achieved in some enterprises,the phosphorus content in the slag has been continuously enriched and increased,and it is impossible to achieve secondary utilization fundamentally. In order to achieve the efficient leaching of phosphorus from high-phosphorus converter slag and reduce the loss of calcium oxide in the leaching process,different acid leaching schemes were designed. The effects of concentration,temperature,time,and stirring conditions of nitric acid and citric acid on the leaching effect were studied. At the same time,the optimal scale regression was used to analyze the test results. The results showed that the concentration of nitric acid had a great effect on leaching. If the citric acid was used at the same concentration of nitric acid,the loss of calcium oxide was low. Under the condition of no stirring at room temperature,the best acid leaching effect can be achieved by extending the acid leaching time. After leaching with citric acid and nitric acid,the CaSiO3 phase and Ca3(PO4)2-Ca2SiO4 phase in the slag disappeared successively. The optimal scale regression model had a good agreement with the experimental results. The use of selective leaching technology can create direct economic value and also bring indirect benefits to improve the ecological environment.
王仲亮, 包燕平, 王达志, 王敏. 高磷转炉渣中磷元素在不同酸中的浸出规律[J]. 钢铁, 2021, 56(4): 103-110.
WANG Zhong-liang, BAO Yan-ping, WANG Da-zhi, WANG Min. Leaching rule of phosphorus element in high phosphorus converter slag with different acids[J]. Iron and Steel, 2021, 56(4): 103-110.
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2021, Vol. 56 
