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Method for accelerating ecological stabilization of coal gangue

A coal gangue and stabilization technology, which is applied in chemical instruments and methods, solid waste removal, sustainable waste treatment, etc. The effect of ventilation, moisture retention and fertilizer storage capacity, reduction of structural strength, and avoidance of waste water discharge

Pending Publication Date: 2022-07-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The massive stockpiling of coal gangue has caused many environmental problems: (1) occupying a large amount of land; (2) because the sulfide minerals (such as pyrite, etc.) contained in it can be oxidized to sulfur dioxide and sulfuric acid in the pollution of the surrounding soil
This patent requires artificial aeration and stirring, which leads to high operating costs; the leaching solution is discharged to cause secondary pollution; colloidal agglomeration components such as iron and aluminum have not been utilized

Method used

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  • Method for accelerating ecological stabilization of coal gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) The coal gangue is crushed to a particle size of 5mm-50mm, mixed with the bacterial suspension of Thiobacillus and Sulfolobus thermophilus, and the coal gangue is periodically leached and drained in the desulfurization and weathering tank. Soak the coal gangue for 100h, the bioleaching environment is the redox potential at 100mv, pH at 2, dissolved oxygen at 2mg / L, and sulfur oxidizing bacteria concentration at 10 6 -10 7 cfu / ml; after the components in the bioleaching solution are stabilized, drain the coal gangue pile for 48 hours. The coal gangue pile can be mixed with inert filler ceramic balls to improve the draining effect.

[0034] (2) The mixed leaching solution of coal gangue and sulfur-oxidizing bacteria is separated by centrifugal method, and the enriched and concentrated sulfur-oxidizing bacteria suspension is returned to the desulfurization weathering tank;

[0035] (3) The supernatant liquid of bacterial liquid separation is contacted with limestone f...

Embodiment 2

[0038] (1) The coal gangue is crushed to a particle size of 50mm-150mm, mixed with the bacterial suspension of Bacillus sulphur, Bacillus ferric oxide, and the coal gangue is periodically leached and drained in the desulfurization and weathering tank. The coal gangue was soaked for 120h, the bioleaching environment was the redox potential of 300mv, the pH was 4, the dissolved oxygen was 4mg / L, and the concentration of sulfur-oxidizing bacteria was 10. 7 -10 8 cfu / ml; after the components in the bioleaching solution are stabilized, drain the coal gangue pile for 72 hours. The coal gangue pile can be mixed with inert filler ceramic balls to improve the draining effect.

[0039] (2) The mixed leaching solution of coal gangue and sulfur-oxidizing bacteria is separated by the sedimentation method, and the enriched and concentrated sulfur-oxidizing bacteria suspension is returned to the desulfurization weathering tank;

[0040] (3) The bacterial liquid separation supernatant is con...

Embodiment 3

[0043] (1) The coal gangue is crushed to a particle size of 150mm-300mm, mixed with the bacterial suspension of high temperature acidophilic archaea, Microspira, and the coal gangue is periodically leached and drained in the desulfurization and weathering tank. , the coal gangue soaking is 150h, the bioleaching environment is redox potential at 500mv, pH at 5, dissolved oxygen at 6mg / L, and sulfur oxidizing bacteria concentration at 10 8 -10 9 cfu / ml; after the components in the bioleaching solution are stabilized, drain the coal gangue pile for 96 hours. The coal gangue pile can be mixed with inert filler ceramic balls to improve the draining effect.

[0044] (2) The mixed leaching solution of coal gangue and sulfur-oxidizing bacteria is separated by the sedimentation method, and the enriched and concentrated sulfur-oxidizing bacteria suspension is returned to the desulfurization weathering tank;

[0045](3) The bacterial liquid separation supernatant is contacted with limes...

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Abstract

The invention discloses a method for accelerating ecological stabilization of coal gangue, which comprises the following steps: carrying out cyclic treatment of periodic leaching and draining on crushed coal gangue and sulfur-oxidizing bacteria in a desulfurization and weathering tank to obtain desulfurized and weathered coal gangue and a mixed leaching solution; carrying out bacterium-water separation on the desulfurized and weathered leachate, and refluxing a bacterium suspension to the desulfurized and weathered pond to be continuously used for desulfurized and weathered coal gangue; neutralizing and flocculating the bacterial-water separation supernatant and an alkaline filler to obtain neutralized flocculated colloid and filtrate, and refluxing the filtrate and gas generated in the neutralizing process to a desulfurization weathering tank; and mixing the neutralized flocculated colloid with the desulfurized and weathered coal gangue to form the coal gangue weathered soil matrix. According to the method, sulfide minerals and iron and aluminum minerals in the coal gangue can be rapidly oxidized and leached, the structure embrittlement and pulverization of the coal gangue are promoted, mineral reconstruction and colloid agglomeration are conducted on iron and aluminum ions, the ventilation, soil moisture conservation and fertilizer storage capacity of coal gangue weathered products is improved, and rapid ecological stabilization of the coal gangue is achieved.

Description

technical field [0001] The invention belongs to the technical field of ecological restoration, and in particular relates to a method for accelerating the ecological stabilization of coal gangue. Background technique [0002] Social and economic development requires a lot of energy consumption. Coal, as the main source of energy supply, is accompanied by a large amount of coal gangue in the production process, which is about 10-15% of the coal output. Coal gangue contains sulfide minerals, iron-aluminum minerals, polycyclic aromatic hydrocarbons and other substances in its chemical composition. The large amount of coal gangue stacking has caused many environmental problems: (1) It occupies a lot of land; (2) Because of the sulfide minerals (such as pyrite, etc.) it contains, it can be oxidized into sulfur dioxide and sulfuric acid in the environment, which is harmful to the atmosphere and water. contamination of the surrounding soil. [0003] The main utilization methods of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B3/38B09B3/60B09B3/80B09B5/00
CPCB09B3/00B09B5/00Y02W30/91
Inventor 胡学伟胡寒田森林赵群黄建洪李英杰史建武刘树根
Owner KUNMING UNIV OF SCI & TECH