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Graded washing process for raw coal

A raw coal and process technology, which is applied in the field of raw coal classification and washing process, can solve the problems of industrial application limitations, complex procedures, and many equipments, and achieve the effects of low production cost, simple process layout, and high separation accuracy

Inactive Publication Date: 2012-01-18
山东新矿赵官能源有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is complex, with many equipment and high energy consumption, which limits its industrial application

Method used

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  • Graded washing process for raw coal

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Embodiment 1

[0042] The raw coal grading sieve adopts a circular vibration method, two sieve plates, the first layer is a square hole sieve plate, and the sieve gap is 80mm, and the +80mm raw coal with a yield of only 6% is separated into manual selection; the second layer is a round hole The sieve plate, with a sieve gap of 36mm, separates the 36-80mm raw coal with a yield of 23.5%, and enters the jig for separation to produce high calorific value lump coal; the yield of -36mm raw coal is 70.5%, of which, the yield of -13mm It is 58.43%. After being sieved, it enters the final coal belt, transports it to the heavy medium raw coal storage bin, and enters the dense medium system for separation.

[0043] The jig machine is an under-screen air chamber type with a separate air supply system and numerical control system.

[0044] The heavy medium cyclone is a two-product cyclone, the heavy product is discharged from the bottom flow port, and the light product is discharged from the overflow por...

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Abstract

The invention relates a graded washing process for raw coal, which comprises the following steps of: dividing the raw coal into different size fractions according to coal quality: raw coal larger than 80 mm, raw coal from 36 mm to 80 mm and raw coal smaller than 36 mm; sorting different size fractions of raw coal by different sorting devices, sorting the raw coal from 36 mm to 80 mm by a raw coalwash box, and sorting raw coal smaller than 36 mm by a dense medium cyclone. The advantages of the two sorting devices are combined to increase the sorting accuracy of single sorting device, so that the recovery rate of commercial coal is maximized, resource loss and wastage are reduced, the production cost is reduced, expense is saved, consumption is lowered, and meanwhile, the processing ability of the whole set of system is improved.

Description

technical field [0001] The invention relates to a classification and washing process of raw coal, in particular to a steam coal separation process with high gangue content, easy crushing, high ash content and many fine grained coals. Background technique [0002] The classification and selection of raw coal is to divide the selected raw coal into several particle sizes for separation. According to the separation equipment, there are two main methods for raw coal separation: dense medium separation and jig separation. In the dense medium separation process, no matter which dense medium is used, it has a certain viscosity, and the drag effect caused by the viscosity of the suspension is different for particles of different sizes, and this difference is sometimes very significant. Therefore, re-referral selection generally adopts a hierarchical selection method. Generally, lump coal larger than 13mm adopts dense medium separation method, and fine coal smaller than 13mm adopts...

Claims

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Application Information

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IPC IPC(8): B03B7/00
Inventor 何希霖王玉生李维华赵建刚李云志
Owner 山东新矿赵官能源有限责任公司
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