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Method for preventing opencast coal mine dust from dispersing by utilizing microorganisms and salt groundwater

A technology for underground brine and open-pit coal mines, applied in microorganism-based methods, biochemical equipment and methods, microorganisms, etc., to achieve good effects, good application prospects, and no secondary pollution.

Inactive Publication Date: 2017-07-25
XINJIANG INST OF ECOLOGY & GEOGRAPHY CHINESE ACAD OF SCI
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Problems solved by technology

At home and abroad, there are already some relatively mature technologies and empirical measures for dust pollution in open-pit coal mines. Big challenge in terms of cost

Method used

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  • Method for preventing opencast coal mine dust from dispersing by utilizing microorganisms and salt groundwater
  • Method for preventing opencast coal mine dust from dispersing by utilizing microorganisms and salt groundwater
  • Method for preventing opencast coal mine dust from dispersing by utilizing microorganisms and salt groundwater

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preparation example Construction

[0032] Step 2. Preparation of bacterial liquid with inductive solidification effect: place the enriched bacteria in urea with a mass content of 1-15% and underground brine with a calcium ion mass concentration of 0.1-2%, and cultivate for 1-3 days. Prepare the bacterial liquid with inductive solidification effect, wherein the bacterial density of the bacterial liquid is 10 4 -10 8 CFU per ml, pH 4-11;

[0033] Step 3, Bacterial Liquid Solidification Dust: Spray the solidified bacterial liquid prepared in Step 2 on the surface of the dust according to the ratio of adding 20-100 ml of bacterial liquid per 100 grams of dust, wherein the bacterial density in the bacterial liquid is 10 4 -10 8 CFU per milliliter, the spraying interval of the bacterial solution is 7 days, and the number of sprays is 1-5 times. The dust after spraying the bacterial solution is placed in a natural dry environment for cultivation and natural air-drying. After the experiment is terminated, the bacteri...

specific Embodiment

[0037]

[0038] It can be seen from Table 1 that different inoculation times, urea mass content and calcium ion concentration will affect the wind resistance ability of the final solidified coal dust, especially in the sixth group with 5 inoculation times, urea mass content 6%, calcium The ion concentration of 0.025 mol / L and the number of inoculations of the eighth group were 3 times, the mass content of urea was 10%, and the concentration of calcium ion was 0.05 mol / L.

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Abstract

The invention discloses a method for preventing opencast coal mine dust from dispersing by utilizing microorganisms and salt groundwater. Firstly, halo-tolerant urea hydrolyzing bacteria are screened from opencast coal mine surface environment; and then the bacteria are placed in the salt groundwater to be cultured for 1 to 3 days, wherein the salt groundwater comprises, by mass concentration, 1-10% of salt, 1-15% of urea and 0.1-2% of calcium ions; and finally, a bacteria solution obtained through enrichment is uniformly sprayed on coal dust surface, and an experiment is terminated after the dust sprayed with the bacteria solution is placed in a natural drying environment for several days. The bacteria utilize the salt groundwater to conduct adhesion bond fixing to particles on dust surface through a solidification effect, so that dust of surface layer cannot migrate with wind; the method for preventing the opencast coal mine dust from dispersing by utilizing the microorganisms and the salt groundwater is green and environmentally friendly and low in cost and can be widely applied to dispersing control of coal mining dust of opencast coal mines in arid and semiarid areas.

Description

technical field [0001] The invention relates to the field of microbial coal mine dust solidification, in particular to a method for preventing open-pit coal mine dust from escaping by using microorganisms and underground salt water. Background technique [0002] Coal is one of the three pillar energies that coexist with oil and natural gas in today's world economy. For a long period of time in the future, it is difficult to change the energy supply pattern dominated by coal. Coal is one of the main channels of energy supply in my country. my country's coal production scale and consumption level rank first among all countries in the world. In coal production, open-pit coal mine production plays a major role. Due to the incomplete storage, transportation, crushing and combustion of coal, a large amount of dust is produced during use. Dust is also the most serious pollutant in the entire open-pit mining (open-pit mining) process of coal mines. The environment can have varying ...

Claims

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Application Information

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IPC IPC(8): E21F5/00C12N1/20C12R1/44
CPCC12N1/20E21F5/00
Inventor 潘响亮宋文娟李文锋张道勇
Owner XINJIANG INST OF ECOLOGY & GEOGRAPHY CHINESE ACAD OF SCI
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