摘要
以陕西某热电厂粉煤灰碱溶脱硅液为原料,采用碳化法工艺制备白炭黑。通过正交实验和单因素实验,得到了碳化的优化条件为:实验反应温度85℃,CO2通气速度500ml.min-1,偏硅酸钠滤液的浓度17.8°Bé,搅拌速度100r.min-1,反应时间2.5h。采用普通干燥方法,制备了白炭黑制品BTH-01,达到GB10517—89中A类白炭黑的指标。以该工艺为对象,分析CO2通入过程中,不同pH值下,体系发生的反应,并利用核磁共振测试手段追踪硅胶的形成过程,较好地描述了硅在碳化反应的不同环境下的存在形式,为分析白炭黑制品的结构提供了理论根据。
In this paper, high-alumina fly ash from a thermal-electric plant of Shaanxi Province was used as raw material, and was treated with alkali to prepare desilicated solution, which was then carbonated to prepare precipitated silica. During orthogonal experiments and single-factor experiments, the optimal carbonation conditions were determined as follows, under 100 r· min^-1 speed stirring, 500 ml· min^-1 CO2 flow rate, sodium metasilicate concentration 17. 8°Be, and at reaction temperature around 85℃, reaction time around 2.5 h. The white carbon black product （BTH-01） was prepared from silica gel through drying at 105℃ overnight. The product （BTH-01） satisfied the type A standard of white carbon black GB10517- 89. The carbonation reaction process was analyzed. Nuclear magnetic resonance measurement method was used to trace the processing path of silica gel, which could better describe the Si--O conjugation during different times in carbonation. The technology provides some guidance to analyzing the structure of white carbon black.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2011年第12期3580-3587,共8页
CIESC Journal
基金
中国地质大学矿物材料国家专业实验室开放基金课题(04103)~~
关键词
粉煤灰
碳化
白炭黑
硅的存在形式
fly ash
carbonation
precipitated silica
Si--O conjugation
