Abstract:

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 peed stirring, 500 ml·min^-1 CO₂ flow rate, sodium metasilicate concentration 17.8°Bé, 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.

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500 ml·min^-1，偏硅酸钠滤液的浓度17.8°Bé，搅拌速度100 r·min^-1，反应时间2.5 h。采用普通干燥方法，制备了白炭黑制品BTH-01，达到GB10517