ABSTRACT Black dross contains alumina, metal oxides and nitrides and some salts. In order to recover pure alumina from black dross, a hydrometallurgical process consisting of leaching and solution purification was investigated. Alkaline leaching of mechanically activated black dross resulted in an aluminate solution with 98% purity together with a small amount of silicate. In order to obtain pure aluminate solution, removal of silicate from alkaline leaching liquor was investigated by coagulation with polyacrylamide, which has never been reported. Most of silicate(IV) was removed at the optimum coagulation condition. The strong interaction of silicate(IV) with polyacrylamide was verified through Fourier-transform infrared spectroscopy (FT-IR), Ultraviolet-visible spectra and viscosity data. The application of this method is expected to have a significant impact on the recovery of pure alumina from black dross materials.

中文翻译：

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聚丙烯酰胺（PAM）去除硅酸盐（IV）净化黑浮渣氢氧化钠浸出液

摘要 黑渣含有氧化铝、金属氧化物和氮化物以及一些盐类。为了从黑渣中回收纯氧化铝，研究了一种由浸出和溶液净化组成的湿法冶金工艺。机械活化黑渣的碱浸产生纯度为 98% 的铝酸盐溶液和少量硅酸盐。为了获得纯铝酸盐溶液，研究了通过聚丙烯酰胺混凝去除碱性浸出液中的硅酸盐，但从未有过报道。大多数硅酸盐（IV）在最佳混凝条件下被去除。通过傅里叶变换红外光谱 (FT-IR)、紫外-可见光谱和粘度数据验证了硅酸盐 (IV) 与聚丙烯酰胺的强相互作用。