RU92007413A - METHOD OF MANUFACTURE OF GLINOZEM FROM NEFELINE CONCENTRATE - Google Patents

Claims (1)

The invention relates to the field of non-ferrous metallurgy and can be used in the production of alumina from nepheline raw materials in the process of hexification of the aluminate solution. Isolation of silica-rich aluminate solutions in two stages (with autoclave desilication in the presence of white recycled sludge, and then in agitators at atmospheric pressure with the addition of lime-containing reagent) leads to an increased loss of useful components, the presence of a significant amount of production mid-sized products, energy consumption for the process. The result is a reduction in production capacity, additional loss of useful components, the increased cost of production of the final product. The invention allows to improve the technical and economic indicators of the production of alumina from nepheline feedstock, increase production capacity, reduce heat and energy consumption during desiliconization in open mixers in the presence of nepheline-limestone mixture, and in autoclaves in the presence of nepheline-limestone sludge (product of low-temperature desilication) together with a garnet slurry P stage. At the same time, in the autoclaves, the desiliconization process is combined with the regeneration process of the sludge introduced as a seed reagent.