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Recovery method of aluminum oxide in hydrated garnet

A technology of hydrated garnet and a recovery method, which is applied in the field of recovery of alumina in hydrated garnet, can solve the problems of unfavorable industrial promotion, complicated process, and low recovery efficiency of alumina, and achieves low economic cost, simple steps, Conducive to the effect of environmental protection

Inactive Publication Date: 2019-05-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this application has a certain recovery effect on aluminum in hydrated garnet, it needs to dry, granulate and roast the red mud. The process is complicated, and the recovery efficiency of alumina is low, which is not conducive to industrial promotion.

Method used

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  • Recovery method of aluminum oxide in hydrated garnet
  • Recovery method of aluminum oxide in hydrated garnet
  • Recovery method of aluminum oxide in hydrated garnet

Examples

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Effect test

Embodiment 1

[0033] The method for recovering alumina in hydrated garnet of the present invention, the specific process is as follows figure 1 As shown, the steps are as follows:

[0034] (1) Mix hydrated garnet and lye uniformly to prepare raw slurry, make the molar ratio of sodium oxide to alumina of 0.5, liquid-solid ratio of 0.5mL / g, and roast at 200℃ for 0.5h, The roasting is carried out in an air atmosphere, the roasting temperature is lower, the energy consumption is reduced, and the cost is lower.

[0035] (2) Put the roasted product in a sodium carbonate solution with an alkali concentration of 5g / L for leaching operation, the leaching temperature is 25℃, the leaching time is 0.2h, and then the solid-liquid separation is carried out. The sodium aluminate solution and the leaching residue are easier Separation, simple operation.

Embodiment 2

[0037] The content of this embodiment is basically the same as that of embodiment 1, except that the molar ratio of sodium oxide to aluminum oxide in the raw slurry is 1.1, the liquid-to-solid ratio is 1.2 mL / g, and it is calcined at 350°C for 1.6 hours. The roasted product was placed in 79g / L sodium hydroxide solution for leaching operation.

Embodiment 3

[0039] The content of this embodiment is basically the same as that of embodiment 1, except that the molar ratio of sodium oxide to aluminum oxide in the raw slurry is 1.7, the liquid-to-solid ratio is 2 mL / g, and it is calcined at a temperature of 500°C for 2.7 hours. The roasted product is leached in 153g / L sodium hydroxide solution, the leaching temperature is 50°C, and the leaching time is 2h.

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Abstract

The invention discloses a recovery method of aluminum oxide in hydrated garnet, and belongs to the technical field of resource recovery. The recovery method comprises the following steps: uniformly mixing the hydrated garnet with a certain amount of alkaline solution, thus preparing raw slurry; carrying out low-temperature roasting on the raw slurry; putting a roasted product in an alkaline solution for low-temperature leaching, and carrying out solid-liquid separation after leaching, thus obtaining a sodium aluminate solution and leaching residue. According to the recovery method disclosed bythe invention, the aluminum oxide in the hydrated garnet can be effectively recovered, the recovery rate can be up to 90 percent, the recovery method has the characteristics of low temperature and short process of a roasting process, energy saving and environment protection are facilitated, and higher industrial popularization value is expressed.

Description

Technical field [0001] The invention relates to a method for recovering alumina in hydrated garnet, which relates to the technical field of resource recovery. Background technique [0002] During the production of Bayer process alumina, a large amount of red mud is produced, the main component is sodium silica slag (Na 2 O·Al 2 O 3 ·1.7SiO 2 ·2H 2 O) and hydrated garnet (3CaO·Al 2 O 3 ·XSiO 2 ·(6-2x)H 2 O), causing the loss of sodium oxide and aluminum oxide during the dissolution process. The methods for recovering alkali and aluminum from red mud include high-pressure hydrochemical method, lime sintering method, lime-carbon dioxide conversion method and acid method. High-pressure hydrochemical method requires high alkalinity, high energy consumption, complicated process, and difficult operation. . At the same time, too long aging time limits the industrial application of this method; the lime sintering method has a short process and mature equipment, which is easy for industri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/06C01F7/08C01F7/14
Inventor 周秋生王彪王一霖程路伟齐天贵李小斌彭志宏刘桂华
Owner CENT SOUTH UNIV
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