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Process for removing sodium oxide impurities in aluminum oxide

A medium-sodium oxide and alumina technology, which is applied in the purification of aluminate/alumina/hydroxide, etc., can solve the problems of adverse environmental impact of sodium removal agent, abrasion of equipment parts, high equipment requirements, etc., and achieve good washing effect, The effect of low equipment abrasion and low equipment corrosion

Pending Publication Date: 2021-11-30
中铝山东工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sodium removal effect of this method can reach the requirement of low sodium, but the reaction time is longer, the abrasion of moving equipment parts such as stirring and reaction tanks is serious, the requirements for equipment are high, and the sodium removal agent will have adverse effects on the environment

Method used

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  • Process for removing sodium oxide impurities in aluminum oxide

Examples

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Effect test

Embodiment 1

[0032] Refer to attached figure 1 : a process for removing sodium oxide impurities in alumina, comprising the following steps:

[0033] 1) Take the industrial waste gas containing 50% carbon dioxide by volume, pass it into water in the acidification reaction kettle, the gas-liquid volume ratio is 4:1, the temperature is 25°C, the pressure is 0.3Mpa, and it is divided into five parts, which are respectively regarded as five grades The lotion flows into each lotion tank by itself, and the pH of each level of lotion is 6.5.

[0034] 2) After the alumina and the fifth-stage lotion are prepared in the beating tank to form a slurry with an alumina content of 250g / L, press and wash from the vertical filter press once, and the filtrate enters the vertical leaf filter for filtration, and the filtrate is discharged , and the filter residue is mixed into the next batch of alumina.

[0035] 3) Step 2) The alumina obtained in the vertical filter press and the fourth-stage washing liquid ...

Embodiment 2

[0039] A process for removing sodium oxide impurities in alumina. On the basis of the process in Example 1, the pressure in the acidification reactor is set to 0.5 MPa, and the gas-liquid volume ratio is set to 5:1 when the first-stage washing liquid is configured, so that each stage The pH of the washing solution is 4, and other conditions are the same as in Example 1.

Embodiment 3

[0041] A process for removing impurities of sodium oxide in alumina. On the basis of the process in Example 1, the pressure in the acidification reactor is set to 0.25MPa, and the gas-liquid volume ratio is set to 3:1 when the first-stage washing liquid is configured, so that all stages The pH of the washing solution is 5, and other conditions are the same as in Example 1.

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Abstract

The invention discloses a process for removing sodium oxide impurities in aluminum oxide, and belongs to the technical field of aluminum oxide impurity removal and purification. Aluminum oxide is generally used as a raw material for electrolytic preparation of metal aluminum in industrial application, and along with progress and development of material science, the aluminum oxide gradually develops multiple purposes. At present, sodium oxide in industrial aluminum oxide is mainly removed by adopting a roasting method and an acid method. In the prior art, the sodium removal reaction time is relatively long, abrasion to movable equipment parts such as a stirrer and a reaction tank is relatively serious, the requirement on equipment is relatively high, and a sodium removal agent can generate adverse effects on the environment. According to the invention, weak acid gas is utilized to prepare washing liquid with specific requirements, static countercurrent multi-stage filtering washing is carried out, the washing effect is ensured, the corrosion to equipment is small, the abrasion is small, washing is sufficient, and the sodium oxide removal efficiency is high.

Description

technical field [0001] The invention discloses a process for removing impurities of sodium oxide in alumina, which belongs to the technical field of impurity removal and purification of alumina. Background technique [0002] Alumina is generally used as a raw material for the electrolysis of aluminum in industrial applications. With the progress and development of material science, alumina has gradually developed many uses. At present, industrial alumina mainly uses roasting method and acid method to remove sodium oxide from alumina. [0003] The roasting method is to add roasting aids when alumina is roasted at high temperature, and the Na 2 O substances that can undergo chemical reactions or adsorption reactions, and Na in alumina 2 O undergoes chemical reaction or adsorption reaction to realize Na 2 O moves from the interface between lattices to the surface of alumina particles until it enters the external environment, so as to achieve the purpose of desodiumization. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/46
CPCC01F7/46
Inventor 王志张放黄云镜刘志成冯永强崔伟陈阳姬晓楠于村王紫荆贾章椿马晴石轶
Owner 中铝山东工程技术有限公司