Semiquantitative indirect method for testing content of montmorillonite in coal minerals

A montmorillonite, semi-quantitative technology, applied in the direction of chemical analysis by titration, chemical analysis by combustion, etc., can solve the constraints of timeliness and universality of analysis and determination, small content, and inability to measure the mineral content of montmorillonite and other problems, to achieve the effect of simple and easy separation means, simple operation, and no influence on the measurement results

Active Publication Date: 2018-11-02
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the determination of mineral content in coal rocks is mostly carried out by XRD (X-ray diffraction) method for quantitative or semi-quantitative analysis. Usually, the content of montmorillonite minerals cannot be measured or its content is seriously small.
Furthermore, the testing instrument X-ray diffractometer is a large-scale analytical instrument, which seriously restricts the timeliness and universality of the analysis and determination of mineral content in coal.

Method used

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  • Semiquantitative indirect method for testing content of montmorillonite in coal minerals
  • Semiquantitative indirect method for testing content of montmorillonite in coal minerals
  • Semiquantitative indirect method for testing content of montmorillonite in coal minerals

Examples

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Effect test

Embodiment 1

[0041] A method for semi-quantitative indirect testing of montmorillonite content in coal, the process flow chart is shown in image 3 ;Specific steps are as follows:

[0042] 1) Separation of inorganic minerals in coal by burning: crush the coal minerals (Xinjiang bituminous coal) to a particle size of less than 74 μm, and evenly spread them in an ash dish so that the mass of each square centimeter of the tiles does not exceed 0.20 g, and then heat them at a temperature of 610 ° C. Burning under the same conditions for 1-1.5 hours (and carry out inspection burning, the burning temperature is 610 ℃, each time is 15-20min, until the mass change after two consecutive burnings does not exceed 0.1% of the mass of coal ash) , take out, cool and dry to obtain coal ash, then weigh and calculate the coal ash content; wherein the calculation method of the coal ash content is shown in formula 1:

[0043]

[0044] In the formula, A is the coal ash content, the unit is percentage (%);...

Embodiment 2

[0056] A semi-quantitative indirect method for testing the content of montmorillonite in coal, the test steps are roughly the same as in Example 1, the difference is that: the coal is Shanxi anthracite, and the burning temperature is 730°C; 0.5347g of the obtained coal ash is weighed and dispersed In 50 ml of water, add dilute sulfuric acid solution 1mL (2.5mol / L); sodium pyrophosphate solution 10mL (1wt%).

[0057] The parameter test results obtained in different steps of this embodiment are shown in Table 1, and the calculated montmorillonite content in the coal is 0.09%.

[0058] The Shanxi anthracite described in this example was measured by the blue suction method described in step 2), and the test results showed that there was no montmorillonite component.

Embodiment 3

[0060] A semi-quantitative indirect method for testing the content of montmorillonite in coal, the test steps are roughly the same as in Example 1, the difference is that the coal is Shanxi anthracite (floor mudstone), and the burning temperature is 700°C; weigh 0.8546g The obtained coal ash was dispersed in 50 ml of water, and then 1 mL (2.5 mol / L) of dilute sulfuric acid solution and 15 mL (1 wt%) of sodium pyrophosphate solution were added.

[0061] The parameter test results obtained in different steps of this embodiment are shown in Table 1, and the calculated montmorillonite content in the coal is 2.29%.

[0062] The Shanxi anthracite described in this example was measured by the blue suction method described in step 2), and the result showed that the content of montmorillonite in the coal mineral was below 1 wt%.

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Abstract

The invention discloses a semiquantitative indirect method for testing content of montmorillonite in coal minerals. The preparation method comprises the following steps: firstly, the coal minerals aresmashed, inorganic minerals in the coal minerals are separated by firing, content of coal ash relative to coal is calculated, then content of montmorillonite in the coal ash is measured with a methylene blue adsorption method, and content of montmorillonite in the coal is calculated finally according to content of the coal ash and content of montmorillonite in the coal ash. The inorganic mineralsin the coal are separated by firing, content of montmorillonite in the coal ash is measured, the measuring precision is higher than that of the conventional method (such as XRD) for measuring contentof montmorillonite in the coal directly, the operation method is simple, a result is shown quickly, and one novel idea can be provided for judging coal sensibility in coalbed methane development.

Description

technical field [0001] The invention belongs to the field of material analysis methods, in particular to a semi-quantitative and indirect method for testing the content of montmorillonite in coal minerals. Background technique [0002] Because the plants that form coal contain inorganic substances, the weathering brings in rock debris minerals and formation water to crystallize and precipitate inorganic minerals during the deposition process, so that the coal contains more or less inorganic minerals. Clay minerals are common inorganic minerals in coal, especially in coal gangue (useless components in coal), the content of clay minerals is higher. The more clay minerals in coal, especially montmorillonite, the more sensitive the coal is. During the coal seam drilling process, the drilling fluid is in contact with the coal rock. Due to the existence of sensitive clay minerals, the coal rock is easy to expand and the mechanical strength is weakened, resulting in the instabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/12G01N31/16
CPCG01N31/12G01N31/16
Inventor 吕帅锋王生维肖宇航袁铭董庆祥
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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