高固含铝酸钠溶液生产砂状氧化铝技术

Production of Sandy alumina by a High solid Content Precipitation

希腊铝厂于 1988年开始使用法国彼斯涅铝公司方法 (简称法铝法 )生产氧化铝。法铝法的特点是采用高固含 (可达 10 0 0 g/ L) ,并向分解槽中适当加入添加剂。分解过程增加中间降温装置后 ,分解产出率得以提高 ,生产出的砂状氧化铝苛性碱含量低于 330 0× 10 - 6,小于 45 μm的粒级低于 8%。

The Pechiney process in precipitation has been used in the plant of 'Aluminium de Grece' since 1988. A description of this process with very high solid content, up to 1,000 grams hydrate per liter of slurry, is applied, particularly with the addition of a chemical in precipitator. It is shown that the combination of this process with the interstage cooling in precipitation allows us to obtain, on a very regular basis, a consistent sandy alumina with the main following characteristics: Soda content lower than 3,300 ppm, and particle size smaller than 45μ less than 8% of weight. The technical results of some smelters show the excellent compatibility of this alumina with the most recent smelting technology.