Method for improving settling separation performance of bauxite slurry

Abstract

The invention discloses a method for improving settling separation performance of bauxite slurry. The method comprises the following step: settling and separating bauxite slurry which is dissolved at a high pressure in a separating and settling tank, wherein an overflow clean liquid of the separating and settling tank is divided into two paths, one of which is led to a coarse liquid tank of a leaf filtering system while the other of which is lead to dilute the bauxite slurry which is dissolved at the high pressure, and a bottom flow of the separating and settling tank is led to a washing and settling tank. According to the method disclosed by the invention, the settling speed of the bauxite slurry is accelerated and the settling and separating effect is obviously improved.

Description

technical field [0001] The invention relates to the technical field of alumina production, in particular to a method for improving the sedimentation and separation performance of bauxite slurry. Background technique [0002] Alumina is the main supply raw material for electrolytic aluminum. With the rapid development of my country's aluminum industry, the demand for aluminum is increasing, and the demand for alumina is also increasing. [0003] The production of alumina is the process of extracting alumina from bauxite to separate it from impurities. At present, the production of alumina mainly adopts the Bayer process. Specifically, the alumina in the bauxite is dissolved with an alkaline solution to obtain a sodium aluminate solution. Impurities such as iron and titanium in the ore and most of the alumina become insoluble compounds and enter the solid residue. This residue is dyed brick red by iron oxide, so it is called red mud. The solution is cooled and crystallized. U...

AI Technical Summary

Problems solved by technology

The production of alumina by Bayer method includes raw ore pulp preparation, high-pressure dissolution, pressure cooking pulp dilution, red mud separation and washing, seed crystal decomposition, aluminum hydroxide classification and washing, aluminum hydroxide roasting, mother liquor evaporation and soda causticization and other main production processes The red mud separation and washing process in the raw ore pulp is carried out in the settling tank and the washing tank, but at present, with the increase of the amount of dissolution and the decline of ore quality, the solid content of the feed increases, and the amount of red mud increases, the settlement tank and the washing tank The processing volume has risen sharply, which has exceeded the upper limit of its processing capacity and cannot meet the normal production demand

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