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Method and system for directly recycling red mud alkali

A red mud alkali, direct technology, applied in chemical instruments and methods, alkali metal compounds, alkali metal carbonates, etc., can solve the problems of complex process and high processing cost, and achieve the effect of reducing processing cost

Inactive Publication Date: 2020-08-25
德州泉润环境资源有限公司
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Problems solved by technology

The method is complicated and the processing cost is high

Method used

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  • Method and system for directly recycling red mud alkali

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Embodiment Construction

[0023] The invention directly recycles red mud alkali without adding any other components. Using circulating distilled water to leach about 4% (equivalent) caustic soda remaining in the red mud, the leaching solution is subjected to MVR+evaporation and crystallization to recover water, and cyclic leaching to obtain a high-concentration alkali solution or solid alkali.

[0024] The red mud alkali used in the present invention directly recycles and utilizes the system, as figure 1 As shown, the shower nozzles 13 are evenly arranged on the top of the leaching tank 1, and each nozzle 13 is connected with the infusion pipe 12, and the infusion pipe 12 passes through the leaching water pump 10 and the leaching water pump 11 and the alkaline circulating water storage tank 6 and the condensation water respectively. The water storage tank 7 is connected. A pH meter 2 is installed at the bottom drain of the leaching tank or vertical storage bin 1, and is connected to a high pH leachate...

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Abstract

The invention discloses a method and system for directly recycling red mud alkali. The method comprises the following steps that: (1) red mud is leached with alkaline circulating water as leaching water, and the pH or conductivity of a leacheate is detected; (2) evaporation and concentration are performed when the pH or concentration of the leacheate is relatively high; (3) when the pH or concentration of the leachate is small, the leachate is used as alkaline circulating water, and fresh water is used as leaching water to leach the red mud; and (4) leaching is stopped when the pH value of theleachate reaches a set value. The system comprises a leaching pool; leaching spray heads are distributed at the top of the leaching pool; each spray head is connected with an alkaline circulating water storage tank and a condensate water storage tank through liquid conveying pipes; a pH meter is arranged at the liquid outlet of the leaching pool and is connected with a high-pH leachate storage tank and the alkaline circulating water storage tank through liquid inlet valves; the liquid outlet of the high-pH leachate storage tank is connected with an MVR evaporator; and the MVR evaporator is connected with a condensate water storage tank and a second evaporator. Additional components are not needed. The method and system have the advantages of simple treatment process, high treatment efficiency, good effect, and low cost.

Description

technical field [0001] The invention relates to a method and system for resource utilization of red mud alkali recovery and treatment, and belongs to the technical field of red mud alkali recovery and treatment. Background technique [0002] Red mud belongs to industrial solid waste, and its alkali content is relatively large, which is easy to cause pollution to the environment, and red mud needs to be dealkalized. In the prior art, additional components are usually added to red mud dealkalization, such as the "Bayer process red mud dealkalization method" disclosed in CN110127725A, which needs to add calcium oxide-containing materials, strong oxidants, and fluorides to the red mud, and CN108585005A discloses "A kind of dealkalization method of red mud by Bayer process" and "A kind of process for dealkalization of red mud by Bayer process at normal pressure" disclosed by CNCN1594093 all need to add milk of lime, and CN108751641A discloses "A kind of red mud dealkalization was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D1/28C01D1/42C01D7/22C01F7/06
CPCC01D1/28C01D1/42C01D7/22C01F7/066
Inventor 冯承湖吴珊李群郑凯
Owner 德州泉润环境资源有限公司
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