Recovery of silica from sodium silicate solution of calcined boron mud
Recovery of silica from sodium silicate solution of calcined boron mud作者机构：School of Materials and Metallurgy Northeastern University
出 版 物：《Rare Metals》 (稀有金属（英文版）)
年 卷 期：2016年第35卷第2期
页 面：204-210页
核心收录：
学科分类：08[工学] 0806[工学-冶金工程] 080601[工学-冶金物理化学]
基 金：financially supported by the National Natural Science Foundation of China(No.51204037) the Fundamental Research Funds for the Central Universities China(No.N140204016)
主 题：Boron mud Carbonation Recovery Silicon dioxide
摘 要：The effect of several parameters on the recovery of silicon dioxide from calcined boron mud（CBM）such as stirring speed, temperature, sodium silicate concentration, and carbonation time was studied. The recovery of silicon dioxide is 88 % when the stirring speed is450 r min-1, temperature is 60 °C, sodium silicate concentration is 1 mol L-1, and the carbonation time is 6 *** effect of carbonation time on the recovery of silicon dioxide is divided into three kinetic regimes, and the carbonation process of sodium silicate solution follows a second-order reaction based on the double-film theory model. The apparent rate constant of the three kinetic regimes is 0.064, 3.178, and 1.130 L h mol-1, *** amorphous SiO_2 products obtained by carbonating the purified solution have 99.6 % purity and are spherical with diameters of about 100 nm.
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