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.