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[Alpha] alumina with low sodium oxide content and preparation method thereof
The invention discloses [alpha] alumina with low sodium oxide content and a preparation method thereof, and the preparation method comprises the following steps: uniformly mixing 100 parts by weight of high-sodium aluminum hydroxide, 1-3 parts by weight of silica-containing quartz sand and 0.62-0.775 part by weight of a mineralizer, and calcining to obtain a reaction material, wherein the mass fraction of silicon dioxide in the silicon-containing quartz sand is greater than or equal to 96%; and screening the reaction material to obtain the alpha alumina with low sodium oxide content. According to the method, after the silicon-containing quartz sand is added and calcined, SiO2 and NaO in the silicon-containing quartz sand react to generate Na2SiO3, sodium is adsorbed on the surface of the silicon-containing quartz sand in a solid form, impurities are screened out by using a screening method, the purpose of reducing sodium in the calcined alpha-alumina is achieved, and the mass fraction of sodium oxide in the finally prepared alpha-alumina with the low sodium oxide content is smaller than or equal to 0.3%.
本发明公开了一种低氧化钠含量的α氧化铝及其制备方法，所述制备方法包括：将以重量份数计的高钠氢氧化铝100份、含硅石英砂1～3份和矿化剂0.62～0.775份混匀后进行煅烧，以获得反应料；所述含硅石英砂中二氧化硅的质量分数为≥96％；将所述反应料进行筛分，以获得低氧化钠含量的α氧化铝。本发明通过添加含硅石英砂在煅烧后，含硅石英砂中的SiO2+NaO反应生成Na2SiO3，钠以固体形式吸附于含硅石英砂表面并使用筛分方法将杂质筛出，实现煅烧α氧化铝的降钠目的，最终制备得到的低氧化钠含量的α氧化铝中所述氧化钠的质量分数≤0.3％。
[Alpha] alumina with low sodium oxide content and preparation method thereof
The invention discloses [alpha] alumina with low sodium oxide content and a preparation method thereof, and the preparation method comprises the following steps: uniformly mixing 100 parts by weight of high-sodium aluminum hydroxide, 1-3 parts by weight of silica-containing quartz sand and 0.62-0.775 part by weight of a mineralizer, and calcining to obtain a reaction material, wherein the mass fraction of silicon dioxide in the silicon-containing quartz sand is greater than or equal to 96%; and screening the reaction material to obtain the alpha alumina with low sodium oxide content. According to the method, after the silicon-containing quartz sand is added and calcined, SiO2 and NaO in the silicon-containing quartz sand react to generate Na2SiO3, sodium is adsorbed on the surface of the silicon-containing quartz sand in a solid form, impurities are screened out by using a screening method, the purpose of reducing sodium in the calcined alpha-alumina is achieved, and the mass fraction of sodium oxide in the finally prepared alpha-alumina with the low sodium oxide content is smaller than or equal to 0.3%.
本发明公开了一种低氧化钠含量的α氧化铝及其制备方法，所述制备方法包括：将以重量份数计的高钠氢氧化铝100份、含硅石英砂1～3份和矿化剂0.62～0.775份混匀后进行煅烧，以获得反应料；所述含硅石英砂中二氧化硅的质量分数为≥96％；将所述反应料进行筛分，以获得低氧化钠含量的α氧化铝。本发明通过添加含硅石英砂在煅烧后，含硅石英砂中的SiO2+NaO反应生成Na2SiO3，钠以固体形式吸附于含硅石英砂表面并使用筛分方法将杂质筛出，实现煅烧α氧化铝的降钠目的，最终制备得到的低氧化钠含量的α氧化铝中所述氧化钠的质量分数≤0.3％。
[Alpha] alumina with low sodium oxide content and preparation method thereof
一种低氧化钠含量的α氧化铝及其制备方法
YU JIANG (author) / QIN NIANYONG (author) / ZHAO SHANLEI (author) / LIU YANTAO (author) / SANG JINGFENG (author) / WANG QIANG (author) / GUO CUIHONG (author) / LIU QIAN (author)
2021-05-14
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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