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Comprehensive utilization method of red mud

A technology of red mud and filter cake, applied in the field of red mud resource utilization, can solve the problems of difficult industrial operation and high cost, and achieve the effect of comprehensive utilization of resources

Pending Publication Date: 2022-07-29
广西田东锦鑫化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] After research and development, it was found that the existing red mud resource utilization methods all have the problems of high cost and difficult industrial operation

Method used

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  • Comprehensive utilization method of red mud

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of resource utilization method of red mud, specifically comprises the following steps:

[0022] First, the red mud is pulped, then industrial waste sulfuric acid is added to react at room temperature, and then the red mud filter cake and sodium sulfate solution with an alkali content of less than 1% are obtained by pressure filtration and dealkalization;

[0023] Secondly, the obtained red mud filter cake is used for reclamation or production of cement and other building materials; specifically, a small amount of soil is added to the red mud filter cake, wherein the mass ratio of red mud filter cake to soil is 1:1, and then the Add fertilizer and / or inoculum for mixed reclamation;

[0024] Finally, the obtained sodium sulfate solution is returned to the Bayer process alumina production system, and fully reacts with lime at a high temperature of 260 ° C to generate calcium sulfate and sodium hydroxide, while controlling the concentration of the sodium sulfate solu...

Embodiment 2

[0026] A kind of resource utilization method of red mud, specifically comprises the following steps:

[0027] First, the red mud is pulped, then industrial waste sulfuric acid is added to react at room temperature, and then the red mud filter cake and sodium sulfate solution with an alkali content of less than 1% are obtained by pressure filtration and dealkalization;

[0028] Secondly, the obtained red mud filter cake is used for reclamation or production of cement and other building materials; specifically, a small amount of soil is added to the red mud filter cake, wherein the mass ratio of red mud filter cake to soil is 2:1, and then the Add fertilizer and / or inoculum for mixed reclamation;

[0029] Finally, the obtained sodium sulfate solution was returned to the Bayer process alumina production system, and fully reacted with lime at 140 ° C to generate calcium sulfate and sodium hydroxide, while the concentration of the sodium sulfate solution in the production system wa...

Embodiment 3

[0031] A kind of resource utilization method of red mud, specifically comprises the following steps:

[0032] First, the red mud is pulped, then industrial waste sulfuric acid is added to react at room temperature, and then the red mud filter cake and sodium sulfate solution with an alkali content of less than 1% are obtained by pressure filtration and dealkalization;

[0033] Secondly, the obtained red mud filter cake is used for reclamation or production of cement and other building materials; specifically, a small amount of soil is added to the red mud filter cake, wherein the mass ratio of red mud filter cake to soil is 3:1, and then the Add fertilizer and / or inoculum for mixed reclamation;

[0034] Finally, the obtained sodium sulfate solution is returned to the Bayer process alumina production system, and fully reacted with lime at 200 ° C to generate calcium sulfate and sodium hydroxide, while controlling the concentration of sodium sulfate solution in the production sy...

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Abstract

The invention discloses a comprehensive utilization method of red mud, and relates to the technical field of red mud resource utilization. The method comprises the following steps: efficiently dealkalizing the red mud by using industrial waste sulfuric acid, returning the dealkalized byproduct sodium sulfate to a dissolution process of Bayer process aluminum oxide production, and fully reacting with lime according to a certain proportion under a high-temperature condition to form two products, namely calcium sulfate and sodium hydroxide. And meanwhile, the dealkalized red mud is used for reclamation or building material production, so that comprehensive utilization of red mud resources is realized.

Description

technical field [0001] The invention belongs to the technical field of red mud resource utilization, and in particular relates to a method for comprehensive utilization of red mud. Background technique [0002] At present, a large amount of industrial waste - red mud is produced in the alumina production process. At present, red mud is often stored by dry method. However, with the continuous development of the alumina industry, the stock of red mud has gradually increased, which has a negative impact on the surrounding ecology. The impact is getting bigger and bigger. The development of comprehensive utilization technology of red mud is a common problem faced by alumina production enterprises. [0003] At present, the fields of large-scale utilization of red mud mainly include the preparation of building materials and the soilization of red mud. The main technical bottleneck is the high alkali content of red mud, which directly affects the resource utilization of red mud. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24B09B3/70C01F7/06C01F11/46
CPCC04B7/24B09B3/00C01F7/0606C01F11/46
Inventor 赵志强郭效瑛刘建国阮奇平农立杰黄桃娥郭变军
Owner 广西田东锦鑫化工有限公司
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