Comprehensive filtering process during aluminum oxide production

Abstract

The invention discloses a comprehensive filtering process during aluminum oxide production. The comprehensive filtering process includes the steps of firstly, rough liquid from a red mud settling separation washing procedure enters a leaf filter through a rough liquid tank and a rough liquid pump; secondly, fine liquid after filtration enters a plate type heat exchanger through fine liquid pump to exchange heat with mother liquor from the mother liquor tank of a seed filtering procedure; thirdly, the bottom flow of the cyclone device of a seed decomposition procedure flows to a flat-plate filter; fourthly, mother liquid obtained through a vertical-plate filter and the flat-plate filter flows to a seed filtering mother liquor tank; fifthly, aluminum hydroxide obtained by the filtering of the flat-plate filter is conveyed to an aluminum hydroxide calcining procedure by a belt conveyor; sixthly, filter cake obtained by the filtering of the leaf filter is conveyed to the red mud settling separation washing procedure. The comprehensive filtering process has the advantages that the procedures are centralized, process flow is shortened, buffer equipment is reduced, and production cost is lowered; centralizing of equipment such as a vacuum pump and an air compressor is achieved, and mutual standby application of equipment is achieved to a certain degree.

Description

technical field [0001] The invention belongs to the technical field of alumina and relates to a comprehensive filtering process in the alumina production process. Background technique [0002] At present, the technological process of most Bayer process alumina plants in China is designed separately for sodium aluminate solution refining, semen cooling, seed decomposition, seed filtration, aluminum hydroxide filtration and other processes. The process is as follows: the crude liquid from the red mud sedimentation, separation and washing process enters the crude liquid tank in the sodium aluminate solution refining process, enters the leaf filter through the crude liquid pump, and the semen obtained after filtration is pumped from the semen to the seed filtration process and stand The seeds produced by the disc filter are mixed, then enter the seed crystal tank, and are transported by the seed crystal pump to the first decomposition tank of the seed decomposition process. The...

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Problems solved by technology

[0004] 1. Each process is set up independently, covering a large area, building many workshops, and high construction investment

[0005] 2. There are many buffer devices, the material conveying process is long and there are intersections, and the production and operation costs are high

[0006] 3. The labor quota of each process is high, and the labor cost is high

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