硅对白泥碳酸钙孔结构的影响研究

Effect of Silicon on the Pore Structure of White Mud Calcium Carbonate

关键词:  碳酸钙  硅含量  氮吸附  分形维数

Key Words:calcium carbonate  silicon content  N2 adsorption  fractal

摘要:通过配制不同硅含量的模拟绿液，苛化生成白泥碳酸钙，运用氮吸附法测定其比表面积和孔结构特征，并用Frenkel-Halsey-Hill(FHH)模型分析其表面分形特征。结果表明，白泥碳酸钙比表面积随着硅含量的提高逐渐增大；孔体积也随着硅含量的增加而增加，且硅含量越大越有利于形成较小尺寸的孔。通过FHH模型计算其分形特征，发现随着硅含量的增加，碳酸钙表面分形维数增大，随着硅含量增加，碳酸钙表面形状逐渐由规则的谷粒状或方形变成不规则片形。

Abstract:The simulated green liquors containing different silicon contents were prepared, and used for producing calcium carbonate by causticizing, the pore structure characteristics of the white mud calcium carbonate were determined by N2 adsorption, and the surface fractal characteristics were analyzed based on Frenkel-Halsey-Hill (FHH) model. The results showed that specific surface area and cumulative pore volume of the calcium carbonate increaced gradually with increasing silicon, and silicon increase was in favor of forming small mesopore in calcium carbonate. FHH model was used to analyze fractal characteristics of calcium carbonate, the results showed that the surface of calcium carbonate changed gradually from regular form to irregular form with the increase of silicon content.