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By Roger Loison

This ebook makes an attempt to supply the clinical and technical foundation of coke manufacture. It offers an in depth account of the actual and chemical mechanisms happening in coke oven chambers and the research of the features of the goods. The construction of coke has continually been a posh job. This learn goals to supply a close account of the actual and chemical mechanisms happening in coke oven chambers and the methods for deciding upon the features of the product. there's specific emphasis at the impression of coal caliber and construction parameters at the ensuing coke. The experimental paintings is drawn from effects acquired at CERCHAR however the details is designed to be acceptable in a large choice of occasions

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Sample text

This method requires more careful supervision than the Kjeldahl method and is more difficult to carry out. (c) Sulphur In general, French coals contain little sulphur, but this is not true of many coals sold and used throughout the world. Sulphur in coal may be found both as mineral compounds and as organic groups attached to the hydrocarbon material. It is important to know the concentrations of each of these forms, although often a knowledge of 'total sulphur' is sufficient. There are two types of method used for the determination of total sulphur.

Coal separation by float-and-sink into different fractions and determination of carbon or calorific value on each fraction. These values are plotted against the ash yield and extrapolated to zero ash yield and consequently to zero mineral matter content. This method assumes that the carbonaceous material is the same for all the fractions; this is an approximation but is usually satisfactory. Knowledge of the gross calorific value on the dry, ash-free basis then allows the ratio (called the mineral factor) of mineral matter to ash yield to be calculated.

Experience shows that when the volatile matter is low there is at times a danger of obtaining a faulty result that is too high, owing to the accidental ingress of air, but the standard does not include those precautions formerly used by some laboratories to avoid this error. The weight loss is reported on the basis either of the air-dried coal, of coal dried at 105°C or of dry, ash-free coal. The terms used are then volatile matter (dry basis) or volatile matter (dry ash-free basis). Note: An interesting attempt at automation of ash and volatile matter determinations has recently been made by the American firm of LECO.

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