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Method for determining bituminous coal caking index

A technology of cohesion index and measurement method, which is applied in the field of determination of bituminous coal cohesion index, can solve problems such as difficulty in ensuring data accuracy and unspecified pulverization time of coal samples, so as to improve accuracy and repeatability and avoid artificial The effect of the influence of factors

Active Publication Date: 2014-03-05
CHINA KINGHO ENERGY GRP +1
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Problems solved by technology

However, GB 474-2008 "Preparation of Coal Samples" does not clearly stipulate the pulverization time of coal samples. However, the measured values ​​of the cohesion index of samples obtained at different pulverization times are quite different, so although they are all measured according to the national standard, However, it is difficult to guarantee the accuracy of the data

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  • Method for determining bituminous coal caking index

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Embodiment

[0028] 1. Sample preparation

[0029] Test coal sample preparation steps and test steps after mixing said test coal sample with special anthracite, wherein:

[0030] Described test coal sample preparation step comprises following process:

[0031] The test coal samples were prepared as air-dried bituminous coal with particle size less than 0.2mm according to GB474-2008, in which coal particles of 0.1-0.2mm accounted for 20-35wt% of all coal samples; 3mm round hole sieve for sieving, and further crush the oversize of the round hole sieve with a hole diameter of 3mm until all pass through; use a dichotomer to shrink the undersize to get no less than 100g of bituminous coal; the iron filings in the bituminous coal that have been shrunk and separated are sucked away by a magnet; the bituminous coal after removing the iron filings is pulverized by a sample preparation pulverizer, and the pulverized bituminous coal is screened by a square hole sieve with an aperture of 0.2 mm. And...

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Abstract

The invention discloses a method for determining a bituminous coal caking index. The method comprises a step of preparing a test coal sample, and a test step after the test coal sample is mixed with special blind coal, wherein the step of preparing the test coal sample comprises the following processes: screening by adopting a circular screen of which the aperture is 3mm after the tested bituminous coal is crushed, further crushing articles on the screen of which the aperture is 3mm until all articles pass through the screen; splitting the articles passing through the screen by adopting a riffle, and splitting out the bituminous coal which is not smaller than 100g; absorbing scrap iron in the bituminous coal split by adopting a magnet; crushing the bituminous coal after the scrap iron is removed, wherein the crushing time does not exceed 30 seconds; screening the bituminous coal which is crushed by a square hole screen of which the aperture is 0.2mm, and further crushing the articles which do not pass through the square hole screen of which the aperture is 0.2mm until all articles pass through the screen. Thus, the accuracy and the repeatability of determining the coal sample caking index are improved.

Description

technical field [0001] The invention relates to the field of coal quality detection, in particular to a method for measuring the caking index of bituminous coal. Background technique [0002] Coal caking index is an important index to judge the caking property and coking property of bituminous coal, and it is also the main parameter to characterize the caking property of bituminous coal. In recent years, with the rise of coal prices, more and more enterprises regard the caking index as an important basis for coal price settlement. Therefore, it is of great significance to accurately measure the caking index of coal and truly reflect the quality of incoming coal to improve the production and economic benefits of enterprises. [0003] The current method for measuring the caking index of bituminous coal is based on GB / T5447-1997 "Measuring Method for Caking Index of Bituminous Coal". The obtained coke blocks are tested for strength in a drum of a certain specification, and th...

Claims

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Application Information

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IPC IPC(8): G01N5/00
Inventor 高春华贺宁侠马中文刘美霞董敏高玉华
Owner CHINA KINGHO ENERGY GRP
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