沉淀法制备超细白炭黑  

Preparation of ultrafine silica by precipitation

作　　者：刘延芳 李启坤 郭晶晶 许兰西 李莉 华超 王健 

机构地区：[1]山东弘兴白炭黑有限责任公司,山东济宁277519

出　　处：《山西化工》2014年第6期26-28,共3页Shanxi Chemical Industry

摘　　要：以水玻璃和硫酸为原料,通过沉淀法制得超细白炭黑。研究了硫酸滴加速率、硫酸浓度、反应终点pH值的控制对超细白炭黑粒径的影响。结果表明,硫酸的滴加速率与浓度直接影响白炭黑的平均粒径,滴加速率越大,平均粒径越大;42%的硫酸体积分数,制得的白炭黑平均粒径最小;反应终点pH值控制在7.6~8.5、陈化时间控制在0.5h^1.0h,制得的超细白炭黑的性能最好。Ultrafine silica is prepared by precipitation with water glass and sulfuric acid as raw materials. The controlling effect of sulfuric acid addition rate, sulfuric acid concentration, the pH of reaction end to ultrafine silica particle size are studied. The results show that sulfuric acid addition rate and sulfuric acid concentration directly affect the average diameter of silica. The greater the addition rate, the larger the average diameter. Average diameter of silica obtaines minimum with 42% volume frac- tion of sulfuric acid. The end of the reaction pH is controlled at 7.6~8.5, the aging time control in 0.5 h^1.0 h, and ultra- fine silica has best performance.

关 键 词：沉淀法 白炭黑 超细 制备 

分 类 号：TQ127.2[化学工程—无机化工] TQ171