煤矸石陶粒滤料的制备及性能研究

Research on Preparation and Performances of Ceramsite Filter Material by Coal Gangue

以煤矸石为原料,分别采用破碎法和成球法制成滤料生料,经快升温或慢升温焙烧获得陶粒滤料。对所制备陶粒滤料的气孔率、气孔孔径和酸碱可溶率等指标进行了分析比较。结果表明:各种陶粒滤料制品均性能优良;制品的气孔率都随着焙烧温度的升高由小变大,又逐渐降低,成球法制品的气孔率普遍要高于破碎法;快烧制品的气孔孔径分布范围较窄,慢烧制品的气孔孔径分布范围则很宽,2种焙烧方式所得制品中孔径大于100μm的气孔都随着焙烧温度的升高而增加;制品的酸碱可溶率均随焙烧温度的升高而降低。实际生产时,可根据煤矸石特性、产品的性能要求、生产成本等确定煤矸石陶粒滤料的制备工艺。

Abstract Coal gangue was used to prepare ceramsite filter material. It was first crushed or pelletized to be green material, which was then roasted at rapid or slow temperature rise. The porosity , pore diameter and acid/alkali solubility of ceramsite filter materials thus prepared were compared. The results show that all ceramsite filter materials have good performances. The porosity increases first and then decrease gradually with the temperature increase and it is generally higher for the product processed by pelletizing than the one by crushing; the pore diameter distribution range of the rapidly roasted product is narrower than that of the slowly roasted one, with the latter being very wide ; and with the rise of the roasting temperature, the number of the pores having a diameter greater than 100μm of the products made by both roasting methods increases and while their acid/alkali solution rate decreases. In practical production, the preparation process of ceramsite filter material can be selected according to the characteristics of the coal gangue, the requirement on the product performance and the production cost.