Efficient method for treating acidic iron-containing wastewater generated by waste coal mine

An acidic and coal mine technology, applied in mining wastewater treatment, chemical instruments and methods, water pollutants, etc., can solve problems such as watershed pollution, achieve high removal rate, high efficiency, and small volume

Inactive Publication Date: 2019-06-18
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the above problems, the present invention provides a method for treating acidic iron-containing wastewater from coal mines gushing out of abandoned coal mines. Portland cement or ordinary Portland cement is used as the main raw material of the treatment agent to efficiently treat acidic iron-containing wastewater in coal mines. Wastewater can effectively solve the problem of river basin pollution caused by acidic iron-containing wastewater from coal mines, and restore the ecological health and river landscape of mining area watersheds

Method used

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  • Efficient method for treating acidic iron-containing wastewater generated by waste coal mine
  • Efficient method for treating acidic iron-containing wastewater generated by waste coal mine
  • Efficient method for treating acidic iron-containing wastewater generated by waste coal mine

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The acidic iron-containing wastewater from a coal mine gushing out of an abandoned mine in Guizhou Province was used for experiments. The raw water quality is shown in Table 1. The water sample is treated with calcium oxide, which is commonly used in the traditional neutralization method and has a better effect, and the treatment agent of the present invention. The components of the treatment agent of the present invention used in the experiment are 80% of Portland cement and 20% of bentonite.

[0046]Totally 4 barrels of water are used in the experiment, 15L of every barrel, respectively add 1.0% calcium oxide (mass percentage, hereinafter all the same), add 1.0% treatment agent of the present invention, 1.5% treatment agent of the present invention, 2.0% treatment agent of the present invention After the addition, the aeration reaction was 60 minutes, and then stood still for 5 hours, and the supernatant liquid was taken for detection. The detection results and the re...

Embodiment 2

[0055] The coal mine acidic iron-containing wastewater gushed out of an abandoned mine in Guizhou Province was tested. The raw water quality is shown in Table 4. The treatment agent of the present invention used in the experiment is a different ratio of raw materials to treat the water sample. details as follows:

[0056] Proportion 1: Ordinary Portland cement 80%, bentonite 20%;

[0057] Proportion 2: Ordinary Portland cement 60%, bentonite 15%, fly ash 25%;

[0058] Proportion three: Ordinary Portland cement 40%, bentonite 10%, fly ash 50%;

[0059] Proportion four: fly ash 100%.

[0060] There are 4 barrels of water in the experiment, each barrel is 15L, adding treatment agent ratio 1 1.0% (mass percentage, the same below), ratio 2 1.0%, ratio 3 1.0%, ratio 4 1.0%, aeration after adding React for 90 minutes, then let it stand for 5 hours, take the supernatant for detection, the detection results and the removal rate of each item are shown in Table 5.

[0061] Table 4 Ra...

Embodiment 3

[0067] A field pilot test was carried out for a tailings mine water in Guizhou Province. The water quality of the acidic mine water is shown in Table 6. The components of the treatment agent of the present invention used in the experiment are 90% of ordinary Portland cement and 10% of bentonite.

[0068] Get totally 4 barrels of tailings mine water on the spot, every barrel 20L, add respectively treatment agent 0.5% (mass percentage, hereinafter all the same) in the present invention, treatment agent 1.0% in the present invention, treatment agent 1.5% in the present invention, this invention The treatment agent in the invention is 2.0%. After the addition, it is aerated for 90 minutes, then left to stand for 5 hours, and the supernatant is taken for detection. The detection results and the removal rates of each item are shown in Table 7.

[0069] Table 6 Raw Water Quality Inspection Form

[0070]

[0071] Table 7 Analysis of water quality testing data and pollutant removal...

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Abstract

The invention provides an efficient method for treating acidic iron-containing wastewater generated by a waste coal mine. Portland cement or common Portland cement is used as a main treatment agent raw material and added into coal mine acidic iron-containing wastewater, and bentonite and coal ash can be doped into a treatment agent, wherein addineffg amount of the treatment agent in the coal mineacidic iron-containing wastewater is 0-2.0%; well mixing, aeration reaction and standing treatment are performed after adding. The efficient method is good in treatment effect and high in pollutant removal rate. The method has remarkable treatment effect on the coal mine acidic iron-containing wastewater and especially can efficiently remove iron and manganese in the wastewater. After the wastewater is treated by the method, removal rate of iron in the wastewater can reach higher than 99%, removal rate of manganese can reach higher than 95%, and other indexes meet national and local water quality emission standards. The treatment agent is low in cost, simple in process and high in efficiency, and the method is economically affordable and does not cause secondary pollution.

Description

technical field [0001] The invention relates to a method for treating acidic iron-containing waste water produced in abandoned coal mines, in particular to a method for removing iron and manganese from abandoned coal mine acidic iron-containing waste water by using portland cement or ordinary portland cement as the main raw material. Background technique [0002] The coal industry is an important energy pillar for the development of human society and a major economic pillar of our country. In Guizhou Province, China, coal has a high sulfur content due to sulfide minerals (such as FeS 2 ) oxidation is easy to form coal mine acidic iron-containing wastewater (AMD, acidmine drainage). This type of wastewater is highly acidic, corrosive, and complex in composition. . Due to various reasons, many coal mines have been closed or abandoned, but many closed mines / mines still have a large amount of waste water coming out of abandoned or closed coal mines or tunnels to continuously p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00C02F101/20C02F103/10
Inventor 刘本洪刘蕾李维张新华张怡
Owner SICHUAN UNIV
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