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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The procedure can be facilitated by using a machine for the shaking. Historical Version s – view previous versions of standard Translated Version s: After rumbling the charcoal is sieve-analysed to measure the size reduction which has occurred.

After cooling, the contents of the beaker are poured through a weighed glass filter which collects the barium-sulphate precipitate. They all operate according to the general scheme of comparison of the sample with a liquid of known viscosity. Historical Version s – view previous versions of standard. The loss of weight will be calculated as a percentage of the initial wet weight.

Non-condensable gases may be collected and analysed but more usually are simply burned to waste. A capacity of about litres is adequate.

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Accurately weigh one gramme of the dry powdered sample and insert it into the calorimeter following the instructions given by the equipment supplier. When the required temperature is reached the retort is allowed to cool to room temperature and the yield of charcoal, tars and pyroligneous acid measured by weighing. Crush or grind sample and weigh accurately 3 grammes in a platinum or porcelain crucible with a lid.

Enter your personal account email address to request a password reset: There were no books found for the applied search filters. 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.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. ASTM D usually modified for charcoal. The buying specification of large industrial users and others will refer to various parameters measured in the process of quality control.


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No items in cart. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. 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. Crush sample in a porcelain mortar and accurately weigh 3 grammes.

After rinsing the filter several times with distilled water, oven dry it and weigh. 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.

The figures in qstm cent indicate the reduction in size suffered during the test. The rise in temperature is monitored with the thermocouple and allowed to rise to final temperature over a few hours.

The most important of these test methods which apply to charcoal testing are listed on the following page. Print 1 2 3 4 5 page sstarting from page current page. This indicates that all volatile matter has been driven off. Crushing is done manually in a porcelain mortar with a pestle.

Chapter 8. Quality control of charcoal and by-products

The right to access the electronic files of ASTM Standards is for purposes of viewing for individual use only. X346 practice may be used to provide a representative sample of the coke from which it is collected.

Combining values from the two systems may result in non-conformance with the standard. The new charcoal producer quickly learns what can be done by himself and which part of the laboratory work can be contracted.

Link to Active This link will always route to the current Active version of the standard. The most common test used in viscosity determination of pyroligneous acid is the Engler-scale.


The yields of charcoal and liquid products can be easily measured and the effect of carbonising temperature studied. Continue drying and reweigh at one-hour intervals until the loss is not more than xstm. This practice may be used to provide a representative sample of the coke from which it is collected. Large consumers, such as the steel or electrical industries, have their own quality control laboratories staffed by trainee operatives.

The drum is rotated at 24 rpm for one hour total 1, rev. These gases are called volatiles and consist c346 tarry vapours and non-condensible gases. The conditions in the small retort are not very similar to continuous large-scale retort systems.

Therefore, the lower the per cent figure the better the charcoal. The effect of tumbling on the charcoal is tested as follows. Grinding is not recommended because the heat generated would already drive off part of the volatiles. You currently cannot view this content. After minutes, open the gas adjusting screw and the air control of the Bunsen burner to full capacity and continue heating until the small flame above the pinhole of the lid has ceased.

Release pressure and discharge the combustion residues by several rinsings with water into a beaker the contents of the calorimeter must be completely transferred. Screen size, ash content and friability are also often specified by large buyers.

But there are many which will be required only once a year or even less, particularly in a small plant. No further reproductions authorized. A white precipitate of barium sulphate will immediately appear. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. The retort should be heated gently with the burner flame to allow the moisture to be driven off and avoid overheating of the charge at any point.