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A deashing treatment method for a coal sample applied for XRD test analysis

A treatment method and test analysis technology, applied in the preparation of test samples, material analysis using radiation diffraction, etc., can solve problems such as the influence of organic matter diffraction front fitting, and achieve the effects of saving test costs, improving efficiency, and simple operation

Inactive Publication Date: 2017-12-15
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Due to the influence of sedimentary environment and tectonic environment, coal contains a small amount of inorganic minerals. Although the content is very low, the diffraction front of inorganic minerals in the XRD pattern of coal is much stronger than that of organic matter, which gives the pseudo-organic matter diffraction front. have a great impact

Method used

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  • A deashing treatment method for a coal sample applied for XRD test analysis
  • A deashing treatment method for a coal sample applied for XRD test analysis
  • A deashing treatment method for a coal sample applied for XRD test analysis

Examples

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Effect test

example 1

[0037]Take about 5 grams of an air-dried coal sample that has been finely ground to 200 mesh, with an ash content of 4.9%, add 30ml of 10% hydrochloric acid, and stir fully with a glass rod, so that the coal sample is completely wetted by hydrochloric acid. Cover the beaker, place the beaker in a constant temperature water bath at 60°C, stir every 5 to 10 minutes, take out the beaker after 40 minutes and let it stand for a while, then filter with slow qualitative filter paper. Wash the coal sample remaining on the filter paper into a plastic beaker until the volume of the washing liquid is close to 2-3ml, then add 10ml of concentrated hydrochloric acid, 20ml of concentrated hydrofluoric acid (concentration 20%) and 10ml of nitric acid (concentration 20%). Stir with a stick, stir once every 5-10 minutes in a constant temperature water bath at 55-60 degrees, take out the beaker after 40-50 minutes and let it stand for a while, filter it with slow qualitative filter paper, wash it...

example 2

[0039] Take about 8 grams of an air-dried coal sample that has been finely ground to 200 mesh, with an ash content of 5.4%, add 30ml of 10% hydrochloric acid, and stir fully with a glass rod, so that the coal sample is completely wetted by hydrochloric acid. Cover the beaker, place the beaker in a constant temperature water bath at 60°C, stir once every 5-10 minutes, take out the beaker after 40 minutes and let it stand for a while, repeat twice, and filter with slow qualitative filter paper. Wash the coal sample remaining on the filter paper into a plastic beaker until the volume of the washing liquid is close to 2-3ml, then add 20ml concentrated hydrochloric acid, 30ml concentrated hydrofluoric acid (concentration 20%) and 10ml nitric acid (concentration 20%). Stir with a rod, automatically stir for 2 hours, take out the beaker and let it stand still, filter with slow qualitative filter paper, after repeated washing, put the coal sample in a constant temperature drying oven a...

example 3

[0041] Dilute 200ml of 36.5% concentrated hydrochloric acid to 400ml of hydrochloric acid solution at a mass ratio of 1:1, and put it into a reagent bottle for use. Weigh 10 grams of the sample, pour it into a polytetrafluoroethylene beaker, then add 300ml of diluted hydrochloric acid, and stir for 1 hour under a stirrer. The coal sample was filtered out to obtain a once-acid-washed sample. Put the sample back into the beaker, add 50ml of hydrofluoric acid, and stir for 2 hours under the stirrer to fully react the hydrofluoric acid and coal. Filter out the coal sample to obtain the sample of secondary pickling; put the sample back into the beaker, add 30ml of concentrated hydrochloric acid, put it under the stirrer and stir for 1h. The coal sample was filtered to obtain a three-washed sample. Put the sample back into the beaker, add 30ml of nitric acid (concentration 20%), stir for 1h, let it stand for 10h, filter out the coal sample, and wash it with deionized water until t...

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Abstract

The invention relates to the field of coal sample deashing, and particularly relates to a deashing treatment method for a coal sample applied for XRD test analysis. The method is advantageous in that (1) batch experiments prove that core samples and coal seam samples of different coal types can be subjected to acid washing by adopting diluted hydrochloric acid, hydrofluoric acid, concentrated hydrochloric acid and a diluted nitric acid solution in order, the method is suitable for deashing treatment of coal particles the particle size of which is -200 meshes (0.074 mm), good deashing effects can be achieved, and the ash content can be reduced to 1% or below; (2) coal samples are treated with a mixed acid solution, thus saving experiment time, saving the experiment cost and increasing the efficiency; and (3) a proper amount of NaHCO3 is added into waste acid liquid for neutralization, in-situ treatment is performed on site and in time, and the method is simple and easy to operate.

Description

technical field [0001] The invention relates to the field of coal sample ash removal, in particular to a deashing treatment method applied to XRD test and analysis of coal samples. Background technique [0002] Coal is an amorphous polymer polycondensate (3-5 aromatic rings / hydrogenated aromatic rings) that is highly cross-linked in three-dimensional space (cross-links exist in the form of covalent bonds and hydrogen bonds), and the core of the basic structural unit is condensation Aromatic rings connect the basic structural units with bridges (short aliphatic chains or ether bridges), sulfur and nitrogen mainly exist in the form of heteroatom rings, and oxygen exists in the form of phenols and ethers. As the degree of coalification deepens, aromatic The proportion of carbon increases, the content of oxygen and hydrogen decreases, the average number of condensed aromatic rings increases, and the structure of coal gradually becomes orderly and homogeneous (mixed arrangement →...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/20G01N1/34
Inventor 李焕同
Owner XIAN UNIV OF SCI & TECH
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