稻壳灰制备高纯度白炭黑联产水玻璃影响因素研究  

Influencing Factors for Preparation of High Purity Silica with Joint Production of Sodium Silicate from Rice Husk Ash

作　　者：丁开宇[1] 张彦军[2] 刘成梅[2] 陈正行[1] 

机构地区：[1]江南大学食品科学与技术国家重点试验室,无锡214122 [2]南昌大学食品科学与技术国家重点试验室,南昌330029

出　　处：《中国粮油学报》2009年第5期1-6,共6页Journal of the Chinese Cereals and Oils Association

基　　金：“十一五”国家科技支撑计划食品加工关键技术研究与产业化开发资助项目(2006BAD05A10-2)

摘　　要：采用改进的沉淀法以稻壳灰为原料制备了水玻璃和高纯度白炭黑,详细阐述了其中关键控制因素对产品质量的影响规律,如搅拌速度、反应时间、料液比和碱液浓度对稻壳灰中二氧化硅溶出率及所制备的水玻璃的模数的影响;以及水玻璃模数、水玻璃中二氧化硅浓度、反应终点pH、反应温度、螯合剂用量、硫酸溶液浓度、硫酸溶液添加速度和陈化时间对白炭黑纯度的影响。加入一定量的螯合剂起到了螯合金属离子和调节二氧化硅粒子周围双电层的作用,均起到了增大产品纯度的作用。High purity silica and sodium silicate were prepared from rice husk ash by the improved precipitation method. The effects of key factors to the quality of products are expatiated, such as the influences of stirring speed, reaction time, solid - liquid ratio and concentration of alkali on the extraction rate of silica from rice husk ash and the modulus of silicate sodium, and the influences of the modulus of silicate sodium, the concentration of silica in the odium silicate, the pH of reaction endpoint, the reaction temperature, the dose of chelating agent, the concentration of sulfuric acid, the addition speed of sulfuric acid, and aging time on the purity of silica. During the preparation process of silica, proper dose of chelating agent was added into the solution, which could not only chelate the metal ions, but also regulate the electric double layer that around the particles, and were beneficial to increase the purity of the product silica.

关 键 词：稻壳灰 高纯度白炭黑 水玻璃 影响因素 

分 类 号：TS210.9[轻工技术与工程—粮食、油脂及植物蛋白工程]