Abstract: In order to solve the leaching problem of ferric oxide in the treatment of waste acid,the response surface analysis method is employed to optimize the acidity,leaching temperature,leaching time and liquid-solid ratio in the treatment process.Based on response experiments,the regression analysis of the experimental results is performed to obtain a quadratic correlation model between four key factors and response values.Variance analysis and parallel experiments prove that the model is accurate and available.The optimum conditions for the treatment process of waste acid by ferric oxide are obtained as follows:acidity is 180 g·L-1,leaching temperature remains at 85℃,leaching time is 600 min,and the liquid-solid ratio is 125 mL∶4.36 g.Under these conditions,the removal rate of arsenic from waste acid by ferric oxide reaches 99.42%.
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