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Method for restraining dissolution of coal gangue pollutant

A coal gangue and pollutant technology, applied in the field of inhibiting the dissolution of coal gangue pollutants, can solve the problems of sulfur-rich weathered coal gangue pollution control, etc., and achieve the effects of reducing the risk of pollutant dissolution, small volume, and ecological environment improvement

Inactive Publication Date: 2018-10-12
GUIZHOU INST OF SOIL & FERTILIZER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for inhibiting the dissolution of coal gangue pollutants to solve the problem of pollution control of sulfur-rich weathered coal gangue

Method used

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Experimental program
Comparison scheme
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Embodiment Construction

[0010] The specific implementations provided by the present invention will be described in detail below, and the advantages and characteristics of the present invention will become clearer along with the description.

[0011] The present invention adds different proportions of excess sludge to the weathered coal gangue through indoor simulation (naturally stacked for 3 to 4 months), and analyzes the changes in indicators such as pH, EC, Eh and heavy metals of the coal gangue leaching solution. The specific process is as follows:

[0012] Weigh 238.95g of gangue samples (moisture content 16.3%), put them in a 500mL plastic cup, and weigh 0%, 0.1%, 0.25%, 0.5%, 1%, 2.5%, 5% of the gangue mass (dry weight) , 10% to add the remaining sludge (moisture content 73%), mix well and add 50mL of deionized water to stir well, leave it at room temperature for 1 week (20-23°C), and set 3 parallels in each group (treatment A); At the same time, add 2% sodium benzoate to the sterilization tr...

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Abstract

The invention discloses a method for restraining dissolution of coal gangue pollutant. According to the method, excess sludge is used as an improvement base medium for treatment and ecological restoration of a coal gangue storage yard. The excess sludge is used after being subjected to sterilization treatment. The excess sludge is used as the improvement base medium for treatment and ecological restoration of the coal gangue storage yard, the sterilization treatment restrains oxidation bacteria in the sludge and the coal gangue, the risk of generation of acid mineral waste water and dissolution of pollutant of the coal gangue is effectively reduced, and the ecological environment of the coal gangue storage yard is improved. Meanwhile, the technical support is provided for solving the problem for treatment of city excess sludge, and the sludge utilization rate is improved.

Description

technical field [0001] The invention relates to the technical field of soil pollution prevention and control, in particular to a method for inhibiting the dissolution of coal gangue pollutants. technical background [0002] Coal gangue is the solid waste produced in the process of coal mining and washing, accounting for about 15% to 20% of coal output, and has become one of the largest industrial wastes in my country. After a large amount of coal gangue is piled up, long-term weathering, rain and snow leaching can produce acid mine wastewater (AMD) with low pH and rich in heavy metals, which will lead to acidification of the surrounding soil and enhanced water toxicity, seriously damaging the downstream aquatic ecosystem and agricultural ecosystem. Especially in the typical karst areas where high-sulfur coal and polymetallic sulfide deposits are widely distributed in southwest China, it has caused extremely serious ecological and environmental problems, which are closely rela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/10
Inventor 刘桂华杨少博付天岭范成五秦松
Owner GUIZHOU INST OF SOIL & FERTILIZER