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Treatment method for recycling waste red mud residues

A treatment method and technology of red mud, applied in the direction of chemical instruments and methods, solid waste removal, application, etc., can solve problems such as unsuccessful development, achieve significant economic and social benefits, and the treatment method is scientific and reasonable, which is beneficial to The effect of environmental protection

Inactive Publication Date: 2012-05-30
李志奇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Up to now, in order to deal with red mud waste to a greater extent and improve its utilization rate, many domestic scientific research institutes have done a lot of related research work, but so far they have not successfully developed a relatively complete method of red mud treatment

Method used

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  • Treatment method for recycling waste red mud residues

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1: A treatment method for red mud waste recycling

[0027] The processing method of red mud waste slag recycling of the present invention, the detailed steps of this processing method are as follows (see attached figure 1 ):

[0028] a. The red mud slurry with a moisture content of 200% transported from the alumina plant through pipeline water is injected into the osmosis tank for initial dehydration, and after dehydration, red mud with a moisture content of 60% and a sodium hydroxide solution with a pH value of 11-12 are obtained (Sodium hydroxide solution penetrates into the diversion channel from the wall and bottom of the permeation tank, and injects it into the liquid collection tank from the diversion channel), injects it into the liquid collection tank, and transports it to the alumina plant for reuse through pipelines;

[0029] b. The red mud obtained after the initial dehydration in step a is sent to the raceway kiln for drying through the conveyor bel...

Embodiment 2

[0033] Embodiment two: basically the same as embodiment one, the difference is:

[0034] In step a: the water content of the red mud slurry transported from the alumina plant is 150%, and the red mud obtained after the initial dehydration in the infiltration tank has a water content of 50%;

[0035] In step c: the amount of additive added accounts for 20% of the total weight of the red mud powder, the additive is a mixture of 8% laterite and 12% fine coal powder, and the granulated mixed material sinks and floats for 6-7 hours at normal temperature in the sink-float storehouse ;

[0036] In step d: the mixed material after sinking and floating is injected into a pressure forming machine according to a conventional method, and pressed into a brick adobe, and stacked for 1 to 3 hours;

[0037] In step e: the red mud brick adobe is dried and heated to 900±5° C. for firing.

Embodiment 3

[0038]Embodiment three: basically the same as embodiment one, the difference is:

[0039] In step a: the water content of the red mud slurry transported from the alumina plant is 300%, and the red mud obtained after the initial dehydration in the infiltration tank has a water content of 80%;

[0040] In step c: the amount of additive added accounts for 10% of the total weight of the red mud powder, the additive is a mixture of 5% laterite and 5% fine coal powder, and the granulated mixed material sinks and floats for 9 to 10 hours at normal temperature in the sink and float store ;

[0041] In step e: after the red mud bricks are dried, the temperature is raised to 950±5° C. for firing.

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Abstract

The invention discloses a treatment method for recycling waste red mud residues. The treatment method comprises the following steps of: firstly, injecting red mud slurry with a water content of 150-300 percent into an infiltration pond for primary dewatering, and after dewatering, obtaining red mud and a sodium hydroxide solution; injecting the sodium hydroxide solution into a liquid collection pond and returning to an aluminum oxide plant for recycling; sending the primarily dewatered red mud into roller kiln for drying to obtain red mud powder; adding an additive to the red mud powder, uniformly stirring and granulating; sinking and floating a mixture material after granulating and then sending the mixture material into a molding machine for pressing and molding into brick blanks; and pouring the brick blanks into a tunnel kiln to dry and burn into clay bricks. Material inlets of the roller kiln and the tunnel kiln are additionally and respectively provided with a waste gas recoverydevice for collecting waste sodium hydroxide gas generated during drying, and the sodium hydroxide solution is obtained through cooling, injected into the liquid collection pond and returned to the aluminum oxide plant for recycling. The method can greatly improve the utilization rate of the red mud, maximally utilize the red mud and change wastes into values. The invention has scientific treatment method, environmental protection and no three waste discharges.

Description

1. Technical field: [0001] The invention relates to a treatment method for red mud in alumina production, in particular to a treatment method for recycling red mud waste residue in alumina production. 2. Background technology: [0002] Red mud is the residue produced when bauxite is leached by strong alkali in the production process of bauxite and alumina. Due to the high iron content of bauxite, the appearance of the residue is often red soil, so it is called red mud. Generally, 1.0-1.3 tons of red mud waste will be produced for every ton of alumina produced. According to statistics, about 4 million tons of red mud waste are produced by alumina enterprises in my country every year, and the cumulative accumulation of red mud is as high as 50 million tons. At present, most of the alumina plants in various countries in the world accumulate waste residues and red mud, build dams to landfill or dump them into the deep sea. The accumulation and storage of red mud not only occup...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00E04C1/40C04B33/132C01F7/20
CPCY02P40/60
Inventor 李志奇
Owner 李志奇
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