Method for purifying heavy metal ions in underground coal gasification polluted water

A heavy metal ion and underground gasification technology, which is applied in the direction of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., to achieve the effects of convenient combination, avoiding secondary pollution, and remarkable removal effect

Active Publication Date: 2018-09-07
HENAN POLYTECHNIC UNIV
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Problems solved by technology

[0006] Aiming at the problems existing in the treatment of groundwater pollution in the prior art, the present invention proposes based on the particularity of the coexistence of complex heavy metal ions in underground coal gasification polluted water and the limitation that the current groundwater pollution treatment technology is difficult to be used in the purification of underground coal gasification polluted water. A high-efficiency, recyclable, non-secondary pollution purification method for heavy metal ions in water polluted by underground coal gasification

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  • Method for purifying heavy metal ions in underground coal gasification polluted water
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  • Method for purifying heavy metal ions in underground coal gasification polluted water

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preparation example Construction

[0038] (1) Preparation of magnetic graphene composites

[0039]In the present embodiment, a one-step hydrothermal method is used to synthesize the magnetic graphene composite material, and the specific steps are as follows: 1.5 g of ferric chloride hexahydrate is completely dissolved in 20 mL of ethylene glycol to obtain a mixed solution A; the graphene oxide is suspended solution (30g, 1wt.%) was added to 130mL of ethylene glycol solution, ultrasonically dispersed into a uniform mixed solution B; the mixed solution A was added dropwise to the mixed solution B at a uniform speed, and 9.0g of sodium acetate was added under vigorous stirring. 30 mL ethylenediamine. Then the mixture was transferred to a polytetrafluoroethylene-lined stainless steel reactor and reacted at 180 °C for 8 h. After natural cooling to room temperature, the ethanol was washed several times, and the product was dried in a vacuum oven at 60°C to obtain a magnetic graphene composite.

[0040] Document 【On...

example 1

[0048] Table 1 Ion concentration and removal rate of underground coal gasification polluted water before and after purification

[0049]

[0050] Weigh 20 mg of magnetic graphene composite material and 100 mL of underground coal gasification polluted water for ultrasonic mixing, adjust the pH of the mixed solution to 2 with 0.5 mol / L HCl, stir and absorb for 75 minutes at 35 ° C to sample, and magnetically separate and recover the composite material The concentrations of various heavy metal ions in the samples were determined by graphite furnace atomic absorption spectrometry. The concentrations and removal rates of various heavy metal ions in the polluted water from underground coal gasification before and after purification by magnetic graphene composites are shown in Table 1.

[0051] It can be seen from the data in Table 1 that under the experimental conditions, the magnetic graphene composite material has an adsorption effect on various heavy metal ions in the undergro...

example 2

[0053] In order to further investigate the removal ability of the magnetic graphene composite material prepared by the present invention to heavy metal ions in underground coal gasification polluted water, the consumption of the composite material is increased from 20 mg per 100 mL to 50 mg, and the other conditions are kept the same. Inductively coupled plasma mass spectrometry was used to detect the polluted water before and after purification. The results are as follows: Figure 8 shown. It shows that the material has obvious removal effect on Cr, Mn, Ni, Zn, As, Cd and other heavy metal elements, and the removal rate is above 85%. Among them, the removal rates of Cr, Ni, As, and Cd are all close to 100%. It shows that the magnetic graphene composite material not only has a good removal effect on Cr(Ⅵ), but also has a good effect on the complex situation of the coexistence of various heavy metal ions such as Pb, Ni, Cu, Cr, Mn, Ni, Zn, As, and Cd. Excellent performance. ...

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Abstract

The invention discloses a method for purifying heavy metal ions in underground coal gasification polluted water. The method is capable of realizing synchronous treatment of multiple heavy metal ions.Aiming at a complicated situation that multiple heavy metal ions coexist in the underground coal gasification polluted water, a magnetic graphene composite material which can be regenerated and cyclically utilized is designed and prepared. The removal rate of the magnetic graphene composite material on the multiple heavy metal ions in the underground coal gasification polluted water is higher than80 percent, wherein the removal rates of Cr, Ni, As and Cd are all close to 100 percent; after the magnetic graphene composite material is cyclically utilized for 10 times, the removal rate on Cr (VI) ions is still up to 98.13 percent. The method disclosed by the invention is capable of effectively purifying the heavy metal ions in the underground coal gasification polluted water, the cost is reduced to a large extent due to cyclic utilization of an adsorbent, and secondary pollution is avoided due to recoverability of the adsorbent.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to the problem of pollution treatment in the coal utilization process. Background technique [0002] Underground coal gasification is the process of converting underground coal into combustible gas or chemical raw materials through thermal and chemical actions. It changes physical coal mining into chemical coal mining, integrating the three major processes of well construction, coal mining and gasification, and is a chemical coal mining technology. The advantages of the underground coal gasification process are as follows: Abandoning huge and heavy coal mining, transportation, washing and surface gasification equipment, greatly reducing the labor intensity of workers, and largely protecting the health and safety of workers; The liquefied residue remains in the burn-out area, which can reduce environmental pollution and surface subsidence; the sulfide and dust in the gas can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F1/48C02F101/20C02F103/34
CPCB01J20/06B01J20/20B01J20/28009C02F1/281C02F1/283C02F1/488C02F2101/20C02F2103/34
Inventor 仪桂云邢宝林王晓冬耿乾浩徐冰曾会会田启明吕由张传祥谌伦建
Owner HENAN POLYTECHNIC UNIV
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