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Liquid phase purification method and purification device for Bayer process aluminum oxide production system

A technology of production system and purification device, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, chemical instruments and methods, and aluminum compounds, etc. Harsh and other problems, to achieve the effect of reducing material viscosity and scarring rate, reducing organic carbon content, and reducing process energy consumption

Pending Publication Date: 2022-05-13
CHIPING XINFA HUAYU ALUMINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Imported bauxite contains high organic carbon. As the production process progresses, Na will be generated in the process solution. 2 C 2 o 4 and the accumulation of total organic carbon (TOC), which affect the process of seed decomposition and evaporation in the production process, resulting in the refinement of the product alumina particle size and affecting product quality
[0003] In order to solve the above problems, the methods currently adopted mainly include bauxite roasting oxidation method, mother liquor method, washing method, crystallization method, precipitation method and ion exchange method. Among them, the bauxite roasting oxidation method is to reduce the entry of organic matter from the source. In the production process, this method requires a lot of heat during the treatment process, resulting in high energy consumption and high cost; although the mother liquor method reduces energy consumption, aluminum hydroxide particles will be produced in the solution, which makes the treatment of organic matter more difficult The washing method is a method with better treatment effect, but due to the harsh treatment conditions, it is difficult to popularize the method; the crystallization method and the precipitation method have the disadvantage of high cost during the treatment process, although the ion exchange method can solve the problem of cation removal problem, but the resin used is difficult to reuse, and a large amount of solid waste is generated, which makes the cost of this method too high and difficult to promote

Method used

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  • Liquid phase purification method and purification device for Bayer process aluminum oxide production system

Examples

Experimental program
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Effect test

Embodiment 1

[0043] as Figure 1 As shown, a purification device for the liquid phase purification method of bayer alumina production system, comprising a mixing tank 1, a rotary kiln 4, a cooler 5;

[0044] The tail of the rotary kiln 4 is equipped with a atomizing spray gun 3, and the kiln head of the rotary kiln 4 is equipped with a burner 6;

[0045] Between the mixing tank 1 and the rotary kiln 4 is installed with a diaphragm pump 2, the diaphragm pump 2 pumps the raw material slurry into the atomization spray gun 3, and the atomization spray gun 3 is sprayed into the rotary kiln 4;

[0046] Rotary kiln 4 is connected to the tail of the kiln with a purification system;

[0047] The purification system comprises a cyclone dust collector 7 and an electric bag dust collector 8, the gas outlet of the cyclone dust collector 7 is connected with the gas inlet of the bag collector 8, and the gas outlet of the electric bag collector 8 is connected to the induced fan 9; through the induced draft fa...

Embodiment 2

[0057] Using the purification device of Example 1, the liquid phase of the Bayer method alumina production system is purified, the main process is as follows:

[0058] (1) Preparation of raw material pulp: The solid materials such as ore, hydrogen aluminum, alumina and other solid materials in the Bayer method alumina production system are mixed with evaporated mother liquor to obtain raw material pulp. Among them, the composition of the evaporated mother liquor is shown in Table 1;

[0059] Table 1 Components and content of evaporated mother liquor (unit: g / L)

[0060] ingredients Al 2 O 3

[0061] (2) Clinker sintering:

[0062] With the diaphragm pump 2, the raw material slurry is sprayed into the kiln by atomizing spray gun 3 self-rotating kiln 4 kiln tail, and then after drying, preheating, decomposition and sintering, sodium aluminate clinker is obtained, and the clinker enters the single barrel cooler 5 to cool and set aside;

[0063] During the sintering proces...

Embodiment 3

[0075]On the basis of Example 2, step (1) of Example 3, the total molecular ratio of sodium oxide to alumina is 1.0:1.

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Abstract

The invention provides a liquid phase purification method and purification device for a Bayer process alumina production system, and the main process is as follows: (1) preparing raw slurry: mixing solid materials and evaporation mother liquor in the Bayer process alumina production system to obtain the raw slurry according to the proportion; wherein the concentration of Na2OK in the evaporation mother liquor is 270-320g / L; (2) clinker sintering: spraying the raw material slurry into a rotary kiln through an atomizing spray gun, fully sintering to obtain clinker, and cooling the clinker in a cooler for later use; and (3) clinker dissolution: mixing the cooled clinker with an aluminum hydroxide washing solution according to a specific ratio, feeding the mixture into a final-stage ore pulp self-evaporator, and converging with dissolved ore pulp to be settled. The method has the advantages that the process is easy to control, the organic matter content can be effectively reduced, and the finished product quality is improved; the purification device has the advantages of being reasonable in design and high in practicability.

Description

Technical field [0001] The present invention relates to the technical field of alumina production, specifically to a Bayer method alumina production system liquid phase purification method and purification device. Background [0002] Imported bauxite contains high organic carbon, which will produce Na in the process solution as the production process progresses 2 C 2 O 4 And the accumulation of total organic carbon (TOC), affecting the seed decomposition, evaporation and other operation processes in the production process, resulting in the refinement of the particle size of the product alumina, affecting the quality of the product. [0003] In order to solve the above problems, the methods currently adopted are mainly bauxite roasting oxidation method, mother liquor method, washing method, crystallization method, precipitation method and ion exchange method, etc., of which the bauxite roasting oxidation method is to reduce organic matter from the source into the production proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/0613C01F7/06
CPCC01F7/0613C01F7/06
Inventor 苏晓光白东林王婷杨希清王萌张刚贾启寇运旺刁磊薛玉伟
Owner CHIPING XINFA HUAYU ALUMINA
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