Method for reducing slip solid content of setting tank

Abstract

The invention discloses a method to reduce the solid content of slurry in settlement tank, comprising the following steps: high-pressure digested slurry from an upper workshop section through a slurry feeding well (2) enters into a settlement tank (1) for liquid-solid separation; the overflow through a crude overflow port (3) is sent to a next working procedure by a crude liquid pump (4); the underflow flows out through a underflow discharge opening (5) at the lower part of the settlement tank (1); part crude liquid through a second overflow port (6), circulation pump (8) and pipelines (7) enters into the slurry feeding well (2) and then the settlement tank (1); thus the slurry in the settlement tank (1) is diluted. The method has the advantages of reducing solid content, improving the settling property of red mud and liquid-solid separation result, ensuring a stable property for the discharging crude liquid and thus ensuring a normal operation of the settling workshop section of red mud.

Description

technical field [0001] The invention relates to a method for reducing the solid content of slurry in a settling tank during alumina production. Background technique [0002] In the process of alumina production, the ore pulp (red mud) after high-pressure dissolution needs to be separated from liquid and solid by settling tanks. The effect of red mud settling is related to the solid content of the feed slurry. The lower the solid content, the lower the viscosity of the slurry. The lower the value, the better the red mud settlement effect. The solid content of the feed slurry to the settling tank is restricted by the concentration of the diluted pulp after dissolution. After the dilution concentration is determined, the solid content of the slurry is determined accordingly. With the development of the alumina industry, increasing the concentration of dissolution dilution has become a powerful measure to increase the decomposition yield and reduce the energy consumption of eva...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method capable of reducing the solid content of the slurry in the settling tank, so as to overcome the shortcomings of the prior art that the slurry entering the settling tank has a high solid content, poor settling performance, and poor liquid-solid separation effect

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