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Recycling method for barium salt of desulphurization slag produced in wet method desulphurization of barer process

A technology of wet desulfurization and desulfurization slag, which is applied in the removal of solid waste and the preparation of alkaline earth metal aluminate/alumina/aluminum hydroxide, which can solve the problem of high desulfurization cost of barium aluminate and achieve high activity and dispersion Good, good technical and economic benefits

Inactive Publication Date: 2012-12-26
GUIYANG AL-MG DESIGN & RES INST
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the high cost defect of barium aluminate desulfurization in the existing Bayer process, and to provide a method for recycling the barium salt desulfurization slag produced by wet desulfurization in the Bayer process. The desulfurization slag is made into barium aluminate and recycled for wet desulfurization in the Bayer process, which greatly reduces the cost of desulfurization

Method used

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  • Recycling method for barium salt of desulphurization slag produced in wet method desulphurization of barer process

Examples

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Embodiment 1

[0019] Example 1: Barium aluminate is used to desulfurize the mother liquor after the high-sulfur bauxite is dissolved to obtain barium salt desulfurization slag, and the barium salt desulfurization slag and aluminum hydroxide are based on the molar ratio of aluminum oxide to barium oxide is 1.1 Mix evenly, place in a roasting furnace at a roasting temperature of 1350°C for 30 minutes to prepare a barium aluminate desulfurizer with a purity of 97.21%, which can be recycled for the desulfurization of seed liquor or causticized liquor.

Embodiment 2

[0020] Example 2: using barium aluminate to desulfurize the causticized solution after the dissolution of high-sulfur bauxite to obtain barium salt desulfurization slag, which is mixed with bauxite according to the ratio that the molar ratio of aluminum oxide to barium oxide is 1.2, Place it in a roasting furnace at a roasting temperature of 1450°C for 60 minutes to prepare a barium aluminate desulfurizer with a purity of 94.33%.

Embodiment 3

[0021] Example 3: The barium aluminate desulfurizer prepared in Examples 1 and 2 is used to desulfurize the causticized liquid after the dissolution of high-sulfur bauxite. When the temperature is 60°C, the time is 25min, and the amount added is When 100%, the desulfurization rate is over 90%.

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Abstract

The invention discloses a recycling method for barium salt desulphurization slag produced in wet method desulphurization of barer process. Barium aluminate desulfurizer is obtained by mixing aluminium-containing materials with the barium salt desulphurization slag, and roasting at a temperature of 1000-1700 DEG C. the obtained barium aluminate desulfurizer is used in the wet method desulphurization of barer process for recycle. The recovery and recycle of the barium salt desulphurization slag greatly reduce the raw material consumption in the production of desulfurizer by using original method, and the desulphurization cost is substantially decreased. The barium aluminate desulfurizer prepared by the method of the invention has a bulk density of about 1.5g / cm3, a volume average particle diameter of about 89.808 [mu]m, and purity of more than 95%; and has a desulfurization rate of 69-85% in a spent liquor, and a desulfurization rate of 70-95% in a causticized liquor, with high purity and activity, and good dispersibility and desulphurization effect; and establishes a more favorable economic foundation for industrial applications of high-sulfur bauxite, and enables the high-sulfur bauxite to be an available resource with good technical and economic benefits.

Description

technical field [0001] The invention relates to the technical field of alumina production by the Bayer process, in particular to a recycling method for barium salt desulfurization slag produced by wet desulfurization in the Bayer process. Background technique [0002] Due to the sharp increase in domestic alumina production, the demand for bauxite has increased sharply, and the bottleneck of bauxite resources has intensified. In view of the current trend of decreasing reserves of high-grade bauxite and declining grade of ore supply, it is necessary to accelerate the development and improvement of utilization technologies of other types of bauxite, expand the available resources of bauxite, and improve the utilization rate of resources. [0003] my country is rich in bauxite resource reserves, with proven reserves reaching 2.3 billion tons, of which, the reserves of diaspore high-sulfur bauxite are more than 150 million tons. In recent years, relevant data show that there are...

Claims

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Application Information

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IPC IPC(8): C01F7/16B09B3/00
Inventor 徐树涛李军旗金刚周正明王家伟陈朝轶车蓉赵平源
Owner GUIYANG AL-MG DESIGN & RES INST
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