摘要:

The Gondwana coals of the Southern Hemisphere represent some 25% of all known reserves. As an indigenous energy source they are thus highly significant in terms of a strong industrial base for the third-world countries. They are also important in terms of the internationally traded coals and as such occupy a unique position in the World's economy.

ISSN:0734-9343    

DOI:10.1080/07349348608905279

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Humic acids, products of profound coal oxidation, were shown to strongly affect coal floatability. These anionic polyelectrolytes make the zeta potential values of kerosene droplets as well as coal particles much more negative.

ISSN:0734-9343    

DOI:10.1080/07349348608905280

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

A Monte Carlo simulation procedure was used to generate a probability distribution of the solids feed rate to a coal preparation plant thickener. Variations about an average value in the raw coal feed rate, proportion of minus 0.5 mm material, amount of out of seam dilution, and fine coal yield resulted in a large range of thickener feed loadings. The effect of the distribution of thickener feed loadings on thickener operation was then assessed using experimental data. Such an analysis is helpful in deciding the level of automation or control required for a particular operation. It was shown that thickeners with a small diameter, similar to the so called high rate units, must have automatic control equipment for bed level detection, underflow rate variation and flocculant addition in order to maintain steady operation. For conventional thickeners automatic control was shown to be necessary in some cases.

ISSN:0734-9343    

DOI:10.1080/07349348608905281

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor