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Process of directly forming and utilizing coal slime of coal cleaning plant

A coal washing plant and coal slime technology, which is applied in the petroleum industry, solid fuel, fuel, etc., can solve the problems of increasing the economic benefits of the enterprise and changing the product structure of the enterprise, so as to solve the problem of coal slime stacking, save energy consumption, and avoid coal slime occupation Land and Pollution Effects

Inactive Publication Date: 2014-02-05
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the present invention, the coal slime coming out of the filter press workshop of the coal washing plant is directly sent to the mixer to be mixed with raw coal and binder for molding, which effectively solves the problems of coal slime stacking, slow sales, land occupation and pollution in the coal washing plant; realizes the coal slime High value-added utilization eliminates the harm of coal slime to the environment; changes the product structure of the enterprise and increases the economic benefits of the enterprise

Method used

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  • Process of directly forming and utilizing coal slime of coal cleaning plant
  • Process of directly forming and utilizing coal slime of coal cleaning plant
  • Process of directly forming and utilizing coal slime of coal cleaning plant

Examples

Experimental program
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Effect test

Embodiment 1

[0020] It is measured that the moisture content of the coal slime filter cake coming out of the filter press workshop of the coal washing plant is 28%, the moisture content of the raw coal (broken to below 6mm) is 10.4%, and the moisture content of the feed material of the forming machine is preferably ≤17%. Calculation formula: It can be obtained that the proportion of raw coal needs to be ≥62.5%, the amount of binder mixed is small, and its moisture content can be ignored. The press filter coal slime is directly transported to the batching machine through the scraper conveyor, and is batched with 65% raw coal and 5% Portland cement according to the weight percentage, and the materials are fully stirred and mixed evenly with a mixer and a wheel mill, and then Roll molding or extrusion molding is carried out, and the briquette product is dried naturally. The measured cold compressive strength is 482 N / ball, hot strength is 221 N / ball, drop strength is 93%, and calorific value...

Embodiment 2

[0022] It is measured that the moisture content of the coal slime filter cake coming out of the filter press workshop of the coal washing plant is 28%, the moisture content of the raw coal (broken to below 6mm) is 11.3%, and the feed moisture of the forming machine is preferably ≤17%. Calculation formula: It can be obtained that the proportion of raw coal needs to be ≥66%, the amount of binder mixed is small, and its moisture content can be ignored. The pressure filter coal slime is directly transported to the batching machine through the scraper conveyor, and is mixed with 65% raw coal, 6% sodium humate and bentonite by weight percentage (the mass percentages of sodium humate and bentonite are respectively: 67 %, 33%) for batching, using a mixer and a wheel mill to fully stir and mix the materials evenly, and then carry out roll forming or extrusion molding, and the briquette products are dried. The measured cold compressive strength is 418 N / ball , heat strength 232 N / bal...

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Abstract

The invention discloses a process of directly forming and utilizing coal slime of a coal cleaning plant. The process comprises the following steps: directly transporting the coal slime from a filter-pressing workshop of the coal cleaning plant to a dosing machine; adding a certain amount of raw coal and an adhesive in percentage by mass; adopting a double-roller forming machine or a screw extruder to form after stirring and uniformly mixing. According to the process disclosed by the invention, the filter-pressing coal slime is not needed to be dried, and can be directly transported to a forming site, so that the coal slime is prevented from occupying land and being polluted. The forming process is simple, a briquette coal product is good in mechanical strength, so that the calorific value of the coal slime briquette coal can be adjusted by matching with the raw coal, and therefore, the use requirements of different users are satisfied. The process disclosed by the invention can be used for effectively solving the problems that the coal slime of the coal cleaning plant is in excess of demand, occupies land, and is polluted.

Description

technical field [0001] The invention relates to a process for directly forming and utilizing coal slime in a coal washing plant, belonging to the technical field of coal processing. Background technique [0002] Coal slime is a low-quality coal product in the coal washing process, which has the characteristics of high moisture content, fine particle size, high ash content and low calorific value. With the improvement of environmental protection and coal quality requirements, the coal slime in coal washing plants often has problems such as slow sales, accumulation and environmental pollution. Coal slime has a high moisture content and cannot be used directly. If it is dried, it will not only consume a lot of energy, but also make it difficult for users to accept low-quality coal with high additional costs. In autumn and winter, the coal slime filter cake is easy to agglomerate, and the large coal slime blocks the warehouse opening, which affects the normal production of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/12C10L5/14
Inventor 张传祥朱红龙马名杰黄光许刘全润邢宝林段玉玲
Owner HENAN POLYTECHNIC UNIV
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