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 of NaOH to SiO2 were optimized. In addition, the statistical ANOVA analysis and confirmation tests were studied. The sodium silicate modulus of 2.85 and leaching rate of 81.4% can be obtained at an optimal parameters (reaction temperature 110 ℃, mass of NaOH to SiO2 6:1 and liquid-solid ratio 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.temperature, liquid-solid ratio and mass of NaOH to SiO2 were optimized. In addition, the statistical ANOVA analysis and confirmation tests were studied. The sodium silicate modulus of 2.85 and leaching rate of 81.4% can be obtained at an optimal parameters (reaction temperature 110 ℃, mass of NaOH to SiO2 6:1 and liquid-solid ratio 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.
WANG Can LIU Hai-bo XIE Jing-jing LU Guang-hui YU Long-qing CHEN Tian-hu
. Optimizing for Preparing Sodium Silicate from Opal of Palygorskite Using Response Surface Method[J]. The Chinese Journal of Process Engineering, 2017
, 17(2)
: 382
-388
.
DOI: 10.12034/j.issn.1009-606X.216326
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