碱浸钼尾矿制备白炭黑的工艺与表征

Preparation process and characterization of white carbon black by alkali leaching molybdenum tailings technology

以钼尾矿为硅源采用除铁碱浸工艺制备水玻璃,并通过化学沉淀法制备了纳米级白炭黑,探讨了钼尾矿碱浸提Si的工艺过程,研究了不同盐酸浓度对制备白炭黑的影响。采用N2吸附BET法、透射电子显微镜（TEM）对白炭黑的比表面积、孔径和颗粒形态进行了表征。结果表明,碱浸过程中在碱浓度4mol/L、液固质量比5∶1、反应温度100℃、反应时间6h的条件下可以获得最大的Si浸出量;采用1mol/L的HCl制备白炭黑产出率最大,可达95%;所制备的白炭黑平均粒径小于200nm,比表面积为203-254m2/g,白炭黑细粉的孔容积为0.23-0.81cm3/g。

The sodium silicate was prepared using the molybdenum tailings as silicon source by the iron removal-alkali leaching technology and nano-sized white carbon black（silica）was prepared by chemical precipitation method.The specific surface area,pore size and particle morphology of white carbon black were characterized by N2 adsorption BET method and transmission electron microscopy（TEM）.The results indicated that the highest Si extraction amount could be obtained at alkali concentration 4mol/L,liquid/solid mass ratio 5∶1,reaction temperature 100 ℃ and reaction time6 h.The maximum yield of white carbon black could reach to 95% using 1mol/L HCl.The average particle size of the as-prepared white carbon black powders was less than 200 nm,and the specific surface area and pore volume of white carbon black was 203-254m2/g and 0.23-0.81cm3/g,respectively.