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A technology of mine water and fluoride removal agent, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., and can solve the problems of low resource utilization rate, burden, and resource utilization.
Pending Publication Date: 2021-07-06
SHENHUA SHENDONG COAL GRP
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Problems solved by technology
The accumulation of a large amount of fly ash has caused a serious burden on the coal mining area and its environment, but at present there is no reasonable way to deal with the fly ash, and it is impossible to realize its recycling
Although fly ash can be used as a resource, it is generally used as an admixture for concrete, and its resource utilization is small, and the resource utilization rate is low
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Embodiment 1
[0096] The outflow of mine water in Shendong Shangwan coal mining area is about 11000m 3 / d, after the sedimentation and filtration treatment of the surface mine sewage plant, the fluorine content is 2mg / L, which exceeds the 1mg / l requirement of the surface type III water, adopting the method of the present invention and such as figure 2 The system shown defluorides mine water from the Shendong Shangwan Coal Mine. in,
[0097] The first underground reservoir 1 has a capacity of 240,000 m 3 , the capacity of the second underground reservoir is 200,000 m 3 ;
[0098] The mine water is introduced into the second underground reservoir through the pipeline and deposited for 20 days to obtain purified mine water located in the upper layer;
[0099] According to the quality of the fly ash, it is 0.5wt% of the quality of the mine water input into the second underground reservoir to get the fly ash, then the fly ash obtained is added to the stirring tank 31 in the fly ash adding d...
Embodiment 2
[0102] Compared with embodiment 1, only following difference:
[0103] The molar concentration of hydrochloric acid solution is 5mol / L;
[0104] The pH of the resulting mixture is 4.1-4.3;
[0105] The amount of the fly ash is 0.3wt% of the amount of mine water injected into the second underground reservoir.
Embodiment 3
[0107] Compared with embodiment 1, only following difference:
[0108] The molar concentration of hydrochloric acid solution is 1mol / L;
[0109] The pH of the resulting mixture is 4.7-4.9;
[0110] The amount of the fly ash is 0.8wt% of the amount of mine water injected into the second underground reservoir.
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Abstract
A method for defluorinating mine water removes fluorine in the mine water through a fluorine removal agent, the fluorine removal agent comprises a main fluorine removal agent, and the main fluorine removal agent is fly ash. The invention also provides a system for defluorinating the mine water by using the method. The system comprises a first underground reservoir, a mine water injection pipeline, a fly ash adding device and a mine water discharge pipeline; the fly ash adding device comprises a stirring pool and a grouting pump; the stirring pool is used for stirring the added fluorine removal agent and water to obtain a mixture; the feeding end of the grouting pump is connected to the discharging port of the stirring pool, and the discharging end of the grouting pump is connected to the mine water injection pipeline and used for pumping the mixture to the mine water injection pipeline; the mine water injection pipeline is connected to the water injection port of the first underground reservoir and is used for injecting mine water and the mixture into the first underground reservoir; and the mine water discharge pipeline is connected to the water intake of the first underground reservoir and is used for discharging the fluorine-removed mine water. According to the method and the system, the treatment capacity of the mine water is large, the fluorine removal cost is low, and fluorine can be effectively removed, so that the fluorine content of the mine water is reduced to 1 mg / L or below.
Description
technical field [0001] The invention belongs to the field of mine water treatment, and in particular relates to a method and system for removing fluorine from mine water. Background technique [0002] The fluorine content in groundwater in many areas of my country is relatively high, and mine water will be produced during coal mining, and the fluorine content in some mine water exceeds 1 mg / L, which is also relatively high. As environmental protection requirements become more and more stringent, some local governments have stricter water quality requirements for discharged mine water, requiring the discharged mine water to meet the Class III limit requirements stipulated in the "Surface Water Environmental Quality Standards". The Class III limit stipulates that the content of fluoride (fluoride ion) shall not exceed 1mg / L. The existing mine water treatment process is mainly sedimentation filtration, which has no fluoride removal effect, resulting in a high fluorine content ...
Claims
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Application Information
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