Treatment method for recycling and harmlessly treating green mud

Abstract

The invention relates to the technical field of environmental protection, in particular to a green mud recycling harmless treatment method, which comprises the following steps: dehydrating green mud, adding dilute black liquor, uniformly stirring, evaporating and concentrating, and feeding to an alkali recovery furnace for combustion. According to the method, the green mud does not need to be subjected to landfill treatment, but is recycled and combusted, so that the problems of land occupation, environment pollution and the like caused by green mud landfill can be solved, carbon particles can be recycled and combusted to produce steam and generate power, the loss of system alkali is reduced, and the method has good environmental protection and economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection, and in particular to a method for processing green mud in a harmless and resourceful manner. Background Art

[0002] The main components of green mud are incompletely burned carbon particles, CaCO3, CaSiO3 and a small amount of alkali, etc. Green mud contains residual alkali and has a certain degree of corrosiveness. At present, most of the green mud in the domestic industry is landfilled, which not only occupies a lot of land and pollutes the environment, but also wastes the carbon particles and alkali. Summary of the invention

[0003] The purpose of the present invention is to provide a method for treating green mud in a harmless and resourceful manner.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A method for harmlessly processing green mud resources comprises the following steps: dehydrating the green mud, adding dilute black liquor, stirring evenly, evaporating and concentrating the green mud, and sending the green mud to an alkali recovery furnace for combustion.

[0006] Furthermore, the concentration of the green mud after dehydration is 43%-47%.

[0007] Furthermore, the concentration of the dilute black liquor is 13-17%.

[0008] Furthermore, the concentration of the mixed solution after uniform stirring is 18-22%.

[0009] Furthermore, the concentration of the concentrated liquid after evaporation and concentration is 68%-72%.

[0010] Compared with the prior art, the present invention does not need to landfill the green mud, but instead recycles and burns it, which not only solves the problems of occupying land and polluting the environment caused by green mud landfill, but also recycles carbon particles to burn and generate steam for power generation, reducing the loss of alkali in the system, and has good environmental and economic benefits. DETAILED DESCRIPTION

[0011] The technical scheme of the present invention is further described below in conjunction with specific examples. It should be understood that the following examples are only exemplary descriptions and explanations of the present invention, and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are included in the scope that the present invention is intended to protect.

[0012] Example 1

[0013] The green mud is placed in a pre-hanging filter for washing and dehydration to a concentration of 45%, and is scraped off by a scraper onto a belt conveyor, and is transported to a mixing tank by a belt. A 15% dilute black liquor is added to the mixing tank and stirred evenly. The dilute black liquor is added until the concentration of the mixed solution after stirring is 20%. The 20% mixed solution is placed in an evaporator for evaporation and concentration to a concentration of 70%, and is sent to an alkali recovery furnace for combustion to recover carbon and alkali.

[0014] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Any modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A method for treating green mud as a resource and making it harmless, characterized in that: Dehydrate the green mud, add dilute black liquor, stir evenly, evaporate and concentrate, and send to the alkali recovery furnace for combustion.

2. The method for treating green mud as a resource and making it harmless according to claim 1, characterized in that: The concentration of the green mud after dehydration is 43%-47%.

3. The method for treating green mud as a resource and making it harmless according to claim 1, characterized in that: The concentration of the dilute black liquor is 13-17%.

4. The method for treating green mud as a resource and making it harmless according to claim 1, characterized in that: The concentration of the mixed solution after being stirred evenly is 18-22%.

5. The method for treating green mud as a resource and making it harmless according to claim 1, characterized in that: The concentration of the concentrated liquid after evaporation and concentration is 68%-72%.