Filtration-integration integrated plant and method for producing aluminum oxide by Bayer process

Abstract

The invention belongs to the field of mineral processing, and particularly relates to a filtration-integration integrated device and method for producing aluminum oxide by a Bayer process. In the device, a crude liquid tank is connected with a leaf filter through a crude liquid pump, the bottom of the leaf filter is connected with a filter cake tank, and the upper part is connected with a fine liquid tank; the bottom of the fine liquid tank is provided with a fine liquid pump; the fine liquid pump is connected with a vertical disk filter; the filter cake tank is arranged on a 5.000 plane; the lower part of the filter cake tank is provided with a filter cake pump; an aluminum hydroxide slurry tank is arranged above a horizontal disk filter; and the horizontal disk filter is connected with a belt conveyor. The device for aluminum oxide filtration provided by the invention implements filtration-integration integration. The invention reduces the crystal seed tank, mixing unit and other units in the existing device, reduces the corresponding pipelines, valves, pipe fittings and the like, reduces the equipment maintenance and maintenance work load in the device operation process, saves the energy, and lowers the production and labor cost.

Description

technical field [0001] The invention belongs to the field of mineral processing, and in particular relates to an integrated filtering device and method for producing alumina by the Bayer process. Background technique [0002] At present, in the process flow of alumina production by Bayer method, control filtration, semen heat exchange, seed filtration and finished product filtration are very critical steps. The equipment involved includes crude liquid tank, crude liquid pump, leaf filter, semen tank, Semen pump, vertical disc filter, seed tank, seed pump, aluminum hydroxide slurry tank, aluminum hydroxide slurry pump, horizontal disc filter, filter cake tank, filter cake pump, conical mother liquor tank, mother liquor tank and Mother liquor pump. [0003] The dissolved bauxite slurry and red mud lotion are diluted and separated by settling to obtain crude sodium aluminate solution, referred to as crude solution. The crude solution is pumped into the leaf filter in the crude...

AI Technical Summary

Problems solved by technology

[0004] The equipment involved in each of the above process steps is distributed in the control filtration workshop, semen heat exchange workshop, seed filtration workshop and finished product filtration workshop, covering a large area, high energy consumption, high production cost, long process flow, large construction investment, Problems of high labor cost and low labor productivity

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