Process Optimization of Preparing Molybdic Acid from Ammonium Molybdate Solution via Acid Precipitation Based on Response Surface Method AITranslate

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Chinese Library Classification Number:TF841.2[冶金工程—有色金属冶金]

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The response surface method was used to investigate the molybdic acid precipitation process by adding sulfuric acid in the ammonium molybdate solution system,as the existing process suffers from low raw material utilization and poor quality and non-uniform particle size of the product.A optimizated quadratic polynomial regression model was established for the three process parameters of acid precipitation temperature A,initial MoO₃ concentration B,and end pH value of acid precipitation C and their interactions,with the molybdenum direct yield Y as the response value.Based on the one-factor experiments,the optimized regression model was obtained as Y=-125.19+5.96A+0.30B-9.80C+4.63×10^-4AB+0.92AC-0.07BC-0.048A²-1.87×10^-3B²-24.80C².The experimental results reveal that the molybdic acid precipitation process is controlled by multiple factors and sensitive to the response of individual factors with significant interactions.The order of influence significance of single factor is C>A>B,and the order of influence significance of interaction is AC>BC>AB.The optimized acid precipitation conditions are as follows:a stirring intensity of 450 r/min,a acid precipitation temperature of 72℃,an initial MoO₃ concentration of 70 g/L,an end pH value of 1.09 controlled by the back-addition method,and a heat preservation time of 180 min.Under the above conditions,the average molybdenum direct yield of 94.53%is achieved with a relative standard deviation of only 0.44%.The obtained molybdic acid is of high purity,good morphology,and relatively uniform particle size.