The grain stability of calcined petroleum coke determines the resistance to breakdown of +4 mm particles used in the manufacture of carbon anodes for use . Designation: D/DM − Standard Practice for. Collection and Preparation of Coke Samples for Laboratory Analysis1 This standard is issued under the. ASTM D Standard Practice for Collection and Preparation of Coke Samples for Laboratory Analysis.

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A correction can be made for moisture content to express ash on a moisture free basis. However, they have great value for comparison between various raw materials since the behaviour of known materials can be compared with new type raw materials or the effect of changing carbonisation temperature can be studied in a comparative way. Shake the whole screen set for two minutes.

Standard Practice for Collection and Preparation of Coke Samples for Laboratory Analysis

This is to prevent the finer charcoal cushioning the effect of rumbling on the coarse material during the test. The testing methods for by-products are derived from standard analytical procedures for liquid chemicals and gaseous fuels. According to estimated ash content accurately weigh three or five grammes in a platinum or porcelain crucible with lid.

Please login to your authorized staff account to use this feature. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. This practice also provides an analysis sample of coke from the gross or divided sample.

An oxygen calorimetric bomb is necessary for this test. Fixed carbon content is an important parameter in steel making charcoal since this is the agent which reduces the iron ore to metallic iron and limits which must be met are often specified.


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After rinsing the filter several times with distilled water, oven dry it and weigh. A simple apparatus for these tests is shown in D436. The charcoal maker engaging in export business may rely on his partners abroad, who are normally well equipped, and have capable staff to deal with problems which arise and provide customers with advice.

A white precipitate of barium aetm will immediately appear. The analysis samples can be used to ast, the wstm of the coke represented, its ability to meet specifications, as well as for other purposes.

Content only available by subscription. Crush or grind sample and weigh accurately 3 grammes in a platinum or porcelain crucible with a lid. Accurately weigh grammes of aastm sample and put it on screen No. In addition the electronic files may not be downloaded or distributed elsewhere over computer networks or otherwise. The rise in temperature is monitored with the thermocouple and allowed to rise to final temperature over a few hours.

The charcoal is first sieved by hand to remove material which passes a 1. When the ml calibration mark has been reached stop and weigh the charcoal fines. The most common test used in viscosity determination of pyroligneous acid is the Engler-scale. Place the crucible in a wire triangle firmly on a tripod and heat the bottom gently with a Bunsen burner, placed at a distance of not less than 6 cm from the crucible.

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Historical Version s – view previous versions of standard Translated Version s: These gases are called volatiles and consist of tarry vapours and non-condensible gases.


The electronic file may not be reproduced in any way. The acceptability of the product will be determined by it’s compliance with the values laid down in the specification. Combining values from the two systems may result in non-conformance with the standard.

The drum is rotated at 24 rpm for one hour total 1, rev. Note down the different weights in percentage of the total initial astk in the following order: Put the hot crucible into a desiccator with calcium chloride as a desiccant, until the sample has cooled.

An offtake pipe leads through a condenser which collects the tars and pyroligneous acids produced from the thermal decomposition of the wood. Preparation of charcoal sample. Price variations may also apply where standard quality indicators are not met. The loss of weight will be calculated as a percentage of the initial wet weight. Prepare sample as above. Crushing is done manually in a porcelain mortar with a pestle.

The most common set is: The figures in per cent indicate the reduction in size suffered during the test.

Large consumers, such as the steel or electrical industries, have their own quality control laboratories staffed by trainee operatives. The weight obtained multiplied by 10 gives the bulk density per litre. Because of the variability of coke and the wide variety of sampling equipment, caution must be exercised in all stages of sampling, from system specifications and equipment procurement to equipment acceptance testing and actually taking the final sample.