响应曲面法优化钾长石活化工艺

Optimization of K-feldspar activation process by response surface method

为确定氢氧化钾溶液对钾长石的最佳活化工艺条件,采用响应曲面法的中心复合设计对钾长石活化工艺条件进行了优化设计。通过对不同工艺条件下获得的氧化铝的提取率进行二次多项式回归得到了相应数学模型。结果表明,活化钾长石的主要影响因素依次为活化温度、活化时间、氢氧化钾浓度和过量率。活化温度为279. 3℃、活化时间为143. 1min、氢氧化钾的浓度为45%、氢氧化钾的过量率为90%时为最优影响因素指标组合,该条件下氧化铝的提取率可达99. 28%。

In order to determine the optimum activation process conditions of K-feldspar in potassium hydroxide solution,the central composite design of response surface method was used to optimize the activation process conditions of K-feldspar.The corresponding mathematical model was obtained by quadratic polynomial regression for the extraction rate of alumina obtained under different technological conditions.The results show that the main influencing factors of activated K-feldspar are activation temperature,activation time,concentration of potassium hydroxide and excess rate.When activation temperature is 279.3℃,activation time is 143.1 min,concentration of potassium hydroxide is 45%and the excess rate is 90%,which is the optimum influence factor combination.The extraction rate of alumina can reach 99.28%under the obtained optimum condition.