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Feeding method for system red mud separation by Bayer process in alumina production

A feeding method, the technology of Bayer method, applied in the direction of the settling tank, etc., can solve the problems of reduced capacity of the settling tank, high solid content and viscosity, affecting product quality, etc., to optimize the settling performance and compression performance, avoid running muddy, and ensure The effect of capacity

Inactive Publication Date: 2009-09-02
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Provide a feeding method for the separation of red mud in the Bayer system in alumina production, to overcome the high solid content and viscosity of the material entering the separation settling tank caused by the decline in ore grade in the prior art, the decrease in the production capacity of the settling tank, and the possible impact on product quality problems

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  • Feeding method for system red mud separation by Bayer process in alumina production
  • Feeding method for system red mud separation by Bayer process in alumina production

Examples

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Effect test

Embodiment 1

[0018] In the red mud separation process of the Bayer process system, 9% of the total weight of the overflow of the separation settling tank (also known as Bayer process crude liquid) is divided, mixed with the diluted Bayer dissolution pulp, and then enters the separation settling tank for sedimentation and separation. The solid content of the material in the separation settling tank decreased to 52g / l, the viscosity decreased, and the alumina concentration remained unchanged or increased slightly. After sedimentation and separation in the separation settling tank, the separation overflow alumina concentration is 168g / l, and the liquid-solid ratio of the separation bottom flow is 2.2.

Embodiment 2

[0020] Divide 10% of the total weight of the overflow of the separation settling tank (also known as Bayer process crude liquid) in the red mud separation process of the Bayer process system, mix it with the diluted Bayer dissolution pulp, and then enter the separation settling tank for sedimentation and separation. The solid content of the material in the separation settling tank was reduced to 55g / l, and the viscosity decreased, while the alumina concentration remained unchanged or slightly increased. After sedimentation and separation in the separation settling tank, the separation overflow alumina concentration is 170g / l, and the liquid-solid ratio of the separation bottom flow is 2.5.

Embodiment 3

[0022] Divide 12% of the total weight of the separation settling tank overflow (also known as Bayer process crude liquid) in the red mud separation process of the Bayer process system, mix it with the diluted Bayer dissolution pulp, and then enter the separation settling tank for sedimentation and separation, so that the The solid content of the material in the separation settling tank decreased to 58g / l, the viscosity decreased, and the alumina concentration remained unchanged or slightly increased. After sedimentation and separation in the separation settling tank, the separation overflow alumina concentration is 170g / l, and the liquid-solid ratio of the separation bottom flow is 2.3.

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Abstract

The invention discloses a feeding method for system red mud separation by a Bayer process in alumina production, comprising the following steps of: shunting a part of overflow of a separation settling tank in the system red mud separation process by the Bayer process; and entering the separation settling tank for settling and separation after being mixed with diluted Bayer digested mineral slurry. The shunting part of the overflow of the separation settling tank is 8 percent to14 percent of the total weight of the overflow. Compared with the prior art, the feeding method has the advantages of reducing the solid content in materials entering the separation settling tank, stabilizing the normal operation of the settling tank; reducing the solid content and the viscosity of materials entering the separation settling tank, optimizing the settling and compression performance of red mud settlement, guaranteeing the production capacity of the settling tank, avoiding the muddy running of the settling tank, and the like.

Description

Technical field: [0001] The invention belongs to the technical field of sedimentation and separation of red mud in Bayer system in alumina production. Background technique: [0002] In the Bayer system of alumina production, after the bauxite is dissolved, a mixed slurry of red mud and sodium aluminate is formed, which is called raw ore slurry. After the raw ore pulp goes through the dilution process, it enters the sedimentation separation process to separate the red mud and sodium aluminate solution, remove impurities, and obtain a relatively pure sodium aluminate solution. After leaf filtration, decomposition, and roasting processes, aluminum hydroxide or alumina products are obtained. Therefore, the normal operation of the sedimentation separation process has a vital impact on product quality, production costs and economic benefits. In recent years, the rapid development of my country's alumina industry has reduced the grade of bauxite ore, so the amount of red mud in t...

Claims

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Application Information

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IPC IPC(8): B01D21/02
Inventor 龚智远王文志邓刚张文峰何友谊
Owner GUIZHOU BRANCH CHINA ALUMINUM IND