Blending process of flotation clean coal in full-size clean coal
A technology of full-size and clean coal, applied in flotation, solid separation, chemical instruments and methods, etc., can solve the problem of unsatisfactory separation of fine-grained coal slime, waste of low-ash clean coal, and impact on clean coal quality, etc. problems, to achieve a good separation effect, reduce ash content, and increase the output of clean coal
Active Publication Date: 2020-02-21
PANJI BRANCH OF FINLAY COAL DRESSING ENG & TECH BEIJING CO LTD
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Problems solved by technology
At the same time, with the improvement of the degree of mechanization of coal mining, the content of pulverized coal in the raw coal washed by coal preparation plants is increasing. Some coal preparation plants even purposely crush large pieces of material in order to recover low-ash clean coal, so that the pulverized coal As the content increases further, high-ash fine mud is mixed into clean coal in various forms, affecting the quality of clean coal, and it is easy to form fine mud coverage on other larger coal particles
The production practice of Xinyuan Coal Preparation Plant shows that the coal slime separator has a good separation effect on coarse coal slime, but the separation effect on fine-grained coal slime is not ideal, especially for very fine-grained coal slime. This results in the waste of a part of low-ash clean coal
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Embodiment 1
[0018] Embodiment 1: Xinyuan Coal Preparation Plant is a mine-type coal preparation plant with a processing capacity of 6.0Mt / a. According to the coal screening test method GB / T477-2008, the raw coal (25-0mm) is sampled, and the Coal samples were sieved, and the experimental data were sorted out to get Table 1 and Table 2.
[0019] Table 1 The results of the large-scale sieving experiment of washed raw coal
[0020]
[0021] It can be seen from the data in Table 1 that the content of raw coal slime (-0.5mm) in the washed raw coal is 7.41%, the ash content is 16.97%, and the ash content is relatively low. The ash content of the raw coal decreases regularly with the decrease of the particle size, indicating that the gangue in the raw coal is relatively hard , not easy to break.
[0022] Table 2 Small screening test results of washed raw coal
[0023]
[0024] It can be seen from Table 2 that the fine-grained coal slime (﹤0.25mm) accounts for 66.61% of the raw coal slime ...
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The invention discloses a blending technology for flotation clean coal in whole-size-fraction clean coal. Coal ash content and moisture determination analysis and screening experiments are carried out on washed raw coal (25-0mm), hydrocyclone product clean coal, teetered bed separator (TBS) concentrate, flotation feed, flotation concentrate, flotation tailings and other coal samples according to coal industry analysis GB / T212-2008 and a coal screening experiment method GB / T477-2008. By processing experiment data, the coal slime content of raw coal and the recovery rate of flotation clean coal are analyzed and calculated out, the yield of clean coal in each size fraction is calculated out through on-site specific washing technology and equipment parameters, accordingly, the significance of adding the flotation technology in improving the recovery rate of clean coal is reasonably analyzed, and the blending effect of flotation clean coal in whole-size-fraction clean coal is powerfully demonstrated.
Description
technical field [0001] The invention relates to the technical field of flotation clean coal blending, in particular to a blending process of flotation clean coal in full-size clean coal. Background technique [0002] With the continuous development of coal preparation equipment and process technology, the yield of clean coal has been effectively improved, and the product quality has been further improved. At the same time, with the improvement of the degree of mechanization of coal mining, the content of pulverized coal in the raw coal washed by coal preparation plants is increasing. Some coal preparation plants even purposely crush large pieces of material in order to recover low-ash clean coal, so that the pulverized coal As the content increases further, high-ash fine mud is mixed into clean coal in various forms, affecting the quality of clean coal, and it is easy to form fine mud coverage on other larger coal particles. The production practice of Xinyuan Coal Preparati...
Claims
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IPC IPC(8): B03B7/00B03D1/00
CPCB03B7/00B03D1/00
Inventor 郭其涛
Owner PANJI BRANCH OF FINLAY COAL DRESSING ENG & TECH BEIJING CO LTD