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A method for purifying acidic mine drainage from tailings dam

A technology for acid mine and purification treatment, which is applied to the treatment of heavy metals in acid mine drainage and the field of acid mine drainage purification treatment of tailings ponds, can solve the problems of large load and excessive load in tailings ponds, and achieves lower treatment costs and lower costs. Load, easy to achieve effect

Active Publication Date: 2020-09-11
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a method for purifying acidic mine drainage of tailings dams, so as to solve the problem of excessive load of tailings dams caused by excessive percolation water load in the prior art, The invention can control the acidic mine drainage of the tailings pond without artificially adding fresh water sources and other chemical neutralizers, so as to realize the purpose of in-situ treatment of the acidic mine drainage of the tailings pond with low energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]Example 1, select an existing small tailings pond with percolation water discharge facilities, and artificially drain the surface acid mine drainage and percolation water drainage of the tailings pond. In the dry season, the acidic mine drainage at the top of the tailings pond was collected in the field. The pH of the water sample was tested to be about 2.34. The ion concentrations in the solution were as follows: Al was 71.5mg / L, Fe was 180.31mg / L, Zn was 11.73mg / L, 15.33mg / L of Cu, 4.60mg / L of Cu, 70.52ug / L of Cd, 6.97ug / L of Pb, 23.87ug / L of Cr and 9.78ug / L of As. , the tested pH is 7.22, and the concentration of each ion is as follows: Al is 18.21mg / L, Fe is 54.31mg / L, Zn is 0.01mg / L, Mn is 7.12mg / L, Cu is 0.51mg / L, Cd is 0.38 ug / L, Pb is 1.06ug / L, Cr is 0.01ug / L and As is 5.34ug / L, and the concentration of other ions is lower than the environmental discharge standard except manganese. Mix the acidic mine drainage with the percolation water, and after gradual mixing...

Embodiment 2

[0025] In Example 2, an existing small tailings pond with percolation water discharge facilities is selected, and the acid mine drainage on the surface of the tailings pond and the percolation water drainage are artificially drained together. In the rainy season, the acidic mine drainage at the dam top of the tailings pond was collected in the field. The average pH of the tested water samples was 2.65. 16.37mg / L of Cu, 5.60mg / L of Cu, 72.46ug / L of Cd, 7.89ug / L of Pb, 25.41ug / L of Cr and 9.11ug / L of As. , the tested pH is 7.24, the concentration of each ion is as follows: Al is 17.42mg / L, Fe is 62.34mg / L, Zn is 0.04mg / L, Mn is 8.12mg / L, Cu is 0.45mg / L, Cd is 0.29 ug / L, Pb is 1.12ug / L, Cr is 0.00ug / L and As is 7.89ug / L. The local rainwater was collected many times for testing. The average pH of the rainwater is 6.10, and the concentration of each ion in the rainwater is lower than the environmental discharge standard. The acidic mine drainage and percolation water are graduall...

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Abstract

The invention discloses a method for carrying out purification treatment on acidic mine drainage water of a tailing reservoir. According to the method, the acidic mine drainage water generated in a surface layer and a shallow layer of the tailing reservoir is neutralized by utilizing percolating water in a deep layer of the tailing reservoir, so that the pH (Potential of Hydrogen) value of the earth surface acidic mine drainage water of the tailing reservoir is improved and a lot of iron compound sediment is generated and is used for adsorbing other ions in mining area wastewater to realize co-precipitation and the effect of purifying a water body is realized; and finally, water which is discharged to the natural water body from the tailing reservoir reaches environment emission standards.By adopting the method disclosed by the invention, the problem that the deposited water load of the tailing reservoir is too heavy is solved and the acidic mine drainage water also can be treated bylow energy consumption; and meanwhile, in-situ or near-distance treatment of the acidic mine drainage water of the tailing reservoir can be realized. According to the method disclosed by the invention, the purification treatment of the acidic mine drainage water of the tailing reservoir is realized; meanwhile, the environment safety of the tailing reservoir can be improved; the resource utilization of tailings can be realized; and the implementation method has the advantages of simplicity and energy saving and has very high application value and application prospect.

Description

technical field [0001] The invention relates to a method for purifying and treating acid mine drainage in a tailings pond, in particular to the treatment of heavy metals in acid mine drainage, and belongs to the technical field of mine water treatment and physical treatment of pollutants in the environmental field. Background technique [0002] With the needs of social and economic development, the mining industry has made great achievements but at the same time it has brought a lot of pollution. As a place to accumulate mineral processing tailings or other industrial waste, the tailings pond is a man-made debris flow with high potential energy. Hazardous source, once there is a problem, it will cause a big environmental accident. Acid mine drainage is a typical and serious pollution from tailings ponds. Acid mine drainage is mostly caused by the oxidation of sulfide minerals during the mining of coal and metal resources. Due to its low pH and containing a large amount of h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F103/10
CPCC02F1/5236C02F1/66C02F2103/10
Inventor 宗美荣陆现彩李娟刘欢向婉丽高磊李萌
Owner NANJING UNIV
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