响应面法优化凹凸棒石尾矿中蛋白石制备水玻璃工艺

Optimizing for Preparing Sodium Silicate from Opal of Palygorskite Using Response Surface Method

以凹凸棒石尾矿中的蛋白石为原料,通过响应面法优化水热碱溶制备水玻璃的工艺条件,在单因素实验的基础上,以水玻璃模数和SiO_2浸出率的加权平均值为响应值,根据Box-Behnken的中心组合实验设计原理对反应温度、液固比、碱硅比(NaOH与SiO_2质量比)进行优化,对实验结果进行方差分析和验证,分析了各因素的显著性和交互作用.结果表明,最佳工艺条件为反应温度110℃,液固比6 mL/g,碱硅比4.05:10,该条件下水玻璃模数和SiO_2浸出率分别为2.85和81.4%,加权平均值最大,为76.1,模型相关系数R^2?0.9921,响应曲面法模型与实验数据一致性很好.

The preparation of sodium silicate based on opal rich palygorskite by using response surface method was studied. The weighted mean of both sodium silicate modulus and leaching rate of SiO2 was chosen as the response variables based on the single factor experiment. According to the Box-behnken center combination experiment, the reaction temperature, liquid-solid ratio and mass ratio of NaOH to SiO2 were optimized. In additionm the statistical ANOVA analysis and confirmation tests were studied. The results showed that the sodium silicate modulus of 2.85 and leaching rate of 81.4% can be obtained at optimal parameters （reaction temperature 110 ~C, liquid-solid ratio 6 mL/g, mass ratio of NaOH to SiO2 4.05：10）, meanwhile, the weighted mean reached a maximum value of 76.1. The correlation coefficient （R2） of the weighted mean was 0.9921, indicating that the model of response surface method showed a good agreement with the experimental data.