针对内蒙产高烧失低品位硅藻土的提纯,采用水洗-焙烧工艺进行了实验.探索了水选次数、焙烧条件等对提纯效果的影响.采用XRD、FTIR、SEM、BET和化学分析等方法对提纯试验获得的产物进行了表征.结果表明:采用水选法可以实现石英、长石和黏土类杂质的去除,有机质的去除采用600℃焙烧就可以获得理想的提纯效果.提纯硅藻土SiO2质量分数达到82.98％以上,比表面积可达44.5 m2/g,堆积体积达21 mL/10g.在隔绝空气条件下焙烧水选提纯土,获得的碳化硅藻土与橡胶相容性好,可替代半补强炭黑.%The purification of the high loss, low-grade diatomite production in Inner Mongolia was carried out by water separation-calcination process. The effects of the times of water separation and calcination conditions on the purification of diatomite were investigated and the characteristics of purified diatomite were conducted by XRD, FTIR, SEM, BET and chemical analysis in this study. The results indicated that the water separation can efficiently remove the quartz, feldspar and clayey impurities in diatomite and the organic matter can be removed by calcination at 600 ℃. Consequently, the silica content fraction in purified diatomite was above 82. 98%, the specific surface area was 44. 5 m2/g and the tap density was 21 mL/10g. In the absence of air condition, the purified carbonized-diatomite had a good compatibility with rubber which can be widely used instead of semi-reinforcing carbon black.
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