清洁度是影响钛白产品分散性指标评价的关键因素.为了找到影响硫酸法钛白粉清洁度的原因,对分散性测试过程中清洁度的判别方法进行了分析.结果表明,粗颗粒的存在是影响清洁度的主要原因.通过对比分析可知,国内钛白粉中的粗颗粒主要由Ca、Al、Si等组成,最大粒径可达210 μm;国外质量较好的钛白粉粗颗粒主要成分为TiO2,粒径多小于30μm.通过对无机表面处理后的浆料拦截筛分,可以有效改善产品的清洁度,进而提高最终钛白产品的分散性.
In order to find the causes which affect the cleanliness of TiO2 by sulfate process,the estimation method for cleanliness during the dispersity testing was studied.The result shows that the cleanliness is a key factor influencing the dispersity evaluation,while the coarse particles in the product are the main influencing factors to the cleanliness of TiO2.According to the comparative analysis,the impurity particles in the domestic TiO2 mainly consist of Ca,Al and Si with the maximum particle size of 210 μm,while the main component of coarse particles in foreign titanium dioxide is TiO2 with the size less than 30 μm.The cleanliness and dispersity of TiO2 can be improved by screening the coarse particles from the slurry after inorganic surface treatment.
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