Flat plate filtration lotion circulating system for aluminum oxide

Abstract

The invention provides a flat plate filtration lotion circulating system for aluminum oxide, belonging to the field of production equipment of aluminum oxide. The flat plate filtration lotion circulating system comprises a flat plate filtering machine, a cooling device, a weak filtrate storage slot and a plurality of pipelines, wherein a weak filtrate flowing from the flat plate filtering machineis cooled by the cooling device and is used for washing aluminum hydroxide crystals, and a pipeline is guided from the weak filtrate storage slot and is used for flushing flat plate filtering cloth. According to the flat plate filtration lotion circulating system, the weak filtrate is utilized for replacing condensate water for flushing the filtering cloth, so that the condensate water is saved, the production burden of procedures is reduced, the production energy consumption is reduced, and the operation cost is lowered; and after being cooled by the cooling device, the weak filtrate is conveyed to the flat plate filtering machine and is used for washing the aluminum hydroxide crystals, so that the volatilization of water vapor is reduced, and the volatilization of a large amount of thermal strong base water vapor is avoided, and furthermore, the wasting of resources and the pollution to an atmospheric environment are avoided.

Description

【Technical field】 [0001] The invention relates to the field of alumina production equipment, in particular to a washing liquid circulation system applied to alumina flat plate filtration. 【Background technique】 [0002] In the production process of alumina hydrometallurgy, bauxite slurry and caustic soda undergo a high-temperature and high-pressure dissolution reaction in an autoclave (or pipeline stripper equipment) to form a mixture of sodium aluminate and red mud with high temperature and high pressure. The high-temperature and high-pressure sodium aluminate crystallizes out aluminum hydroxide crystals in the decomposition tank, and the slurry containing aluminum hydroxide crystals is sent to a flat plate filter for vacuum filtration, washing, and roasting to obtain alumina powder. For some reasons, the flat plate filter cloth needs to be cleaned. The existing flat plate washing process uses a large amount of condensed water for washing, which consumes a large amount of c...

AI Technical Summary

Problems solved by technology

For some reasons, the flat plate filter cloth needs to be cleaned. The existing flat plate washing process uses a large amount of condensed water for washing, which consumes a large amount of condensed water and increases the production burden of the subsequent process. It is also a waste of resources and increases production consumption. and running costs

In addition, during the washing process of aluminum hydroxide crystallization, the condensed water washes the high-temperature aluminum hydroxide slurry to produce a hot weak filtrate. Washing the filter cake again with the hot weak filtrate will cause a large amount of hot strong alkali steam to volatilize, and the hot The volatilization of strong alkali vapor is not only a waste of resources, but also seriously pollutes the atmospheric environment

Images