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Red mud processing method

A treatment method and technology of red mud, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of ineffective industrial application, high cost, large investment, etc., and achieve residue-free biocompatibility , low energy consumption, excellent performance

Active Publication Date: 2017-12-19
山东海逸生态环境保护有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the technical problems of large investment, high energy consumption, high cost, and ineffective industrial application of the existing red mud treatment technology, the present invention provides a red mud treatment method, aiming at realizing multi-channel and large-scale red mud treatment. resource utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] In this example, a method for microbial agitation and solidification of red mud, the method includes the following steps:

[0077] a. Red mud is loaded into container 6;

[0078] b. Through the infusion pipeline 7, through the sprinkler 9, first spray the red mud in the container 6 to the red mud in the container 8. The concentration of 1.5 times of the pore volume of the red mud to be solidified in the container 8 is the Bacillus pasteurian liquid of OD600=1.2, while spraying Drive the paddle 5 of the main shaft 4 through the reducer 1 to stir the red mud, and let it stand for 3 to 12 hours;

[0079] c. Utilize infusion pipeline 7, sprinkler 9 again to the cementing liquid in container 8 of red mud spraying in container 6 (Bacillus pasteurian bacteria liquid: cementing liquid=1: 1, contain urea and calcium chloride in the cementing liquid, The concentration is 1mol / 1), and while spraying, the paddle 5 of the main shaft 4 is driven by the reducer 1 to stir the red mud;...

Embodiment 2

[0084] Pour 200-300g of red mud into the beaker, make it evenly cover the bottom of the beaker, then pour 400ml of Bacillus pasteurian bacteria liquid (OD600=1.2), stir well, then let stand for 12 hours. Then add 400mL of cementing solution (Bacillus pasteurian bacteria solution: cementing solution = 1:1, the cementing solution contains urea and calcium chloride, the concentration is 1mol / 1), fully stir, and at room temperature 20 ~ 30 ℃ Stand at constant temperature under the environment, then pour out the liquid in the beaker every 12 hours, and add 100ml of cementing solution. Finally, solidified red mud is obtained after 6 rounds.

[0085] [Application and Effect] The unconfined compressive strength after treatment is 1.5MPa; the compressibility coefficient is 0.92MPa -1 ; Rebound modulus 435MPa.

Embodiment 3

[0087] Pour 200-300g of red mud into the beaker, make it evenly cover the bottom of the beaker, then pour 400ml of Bacillus pasteurian bacteria liquid (OD600=1.2), stir well, then let stand for 12 hours. Then add 400mL of cementing solution (Bacillus pasteurian bacteria solution: cementing solution = 1:1, the cementing solution contains urea and calcium chloride, the concentration is 1mol / l), fully stir, and at room temperature 10 ~ 20 ℃ Stand at a constant temperature under a certain environment, then pour out the liquid in the beaker every 6 hours, and add 100ml of cementing solution. Finally, solidified red mud is obtained after 6 rounds.

[0088] [Application and Effect] The unconfined compressive strength after treatment is 1.2MPa; the compressibility coefficient is 0.105MPa -1 ; Modulus of resilience 390MPa.

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Abstract

The invention discloses a red mud processing method. Red mud is mixed with a bacterial liquid containing Bacillus pasteurii to obtain a mixture 1. A consolidating solution is preferably added to the mixture 1, and the consolidating solution and the mixture 1 are mixed to obtain a mixture 2; and the mixture 2 is used in a civil engineering material, and the consolidating solution is sprinkled on the surface of the obtained civil engineering material after construction in order to complete the removal of the red mud from the civil engineering material. The Bacillus pasteurii is creatively compounded and contacted with the red mud to surprisingly obviously improve the strength and the rigidity of the red mud; the processed red can surprisingly meet requirements of roadbeds, base layers and sub-base layers of highways and port stockyards when used as a filling material; and heavy metals and other harmful components in the red mud also can be expectedly immobilized through the method. The method can realize the multi-channel and large-scale recycling of the red mud, and realize the purpose of changing red mud into valuables.

Description

technical field [0001] The invention relates to a method for treating red mud by adopting a microbial method, and belongs to the technical field of industrial waste treatment. Background technique [0002] Red mud is a red muddy strong alkaline solid waste with high water content that remains after alumina is produced from bauxite through various physical and chemical treatments. Its output varies with ore grade, production method and technical level. Generally speaking, 0.8-1.5 tons of red mud are produced for every ton of alumina produced. At present, the cumulative stockpiling of red mud in my country exceeds 350 million tons. The large stockpiling of red mud not only occupies land, wastes resources, but also easily causes environmental pollution and safety hazards. According to statistics, as of the end of 2015, the annual discharge of red mud has exceeded 70 million tons, and the cumulative stockpiles have exceeded 352 million tons, while the utilization amount is abo...

Claims

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Application Information

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IPC IPC(8): C04B18/04C04B20/02C04B28/00
CPCC04B18/0409C04B20/023C04B28/00C04B2201/50C04B2103/0001Y02W30/91
Inventor 刘鹏程钰
Owner 山东海逸生态环境保护有限公司
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