ISSN:0734-9343    

DOI:10.1080/07349340108945629

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Airborne dust generation is one of the byproducts of coal mining, processing, and handling. The amount of airborne total dust (ATD, respirable size and larger) and airborne respirable dust (ARD) generated is of primary interest for designing the level of engineering controls needed for adequate dust abatement. Laboratory crushing experiments were conducted in a wind tunnel with a roll crusher to identify relationships among crushing parameters, product size, coal rank properties, and airborne dust generation. Through the first series of experiments, the effect of primary and secondary breakage processes on both product size and airborne dust generation was examined. Through a second series of experiments, the effect of coal rank properties on product size and airborne dust generation was studied using a uniform crushing process with secondary breakage

ISSN:0734-9343    

DOI:10.1080/07349340108945630

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

This paper describes the determination of capillary pressure curves on flocculated fine coal filter cakes, which to the best of our knowledge, has not been reported before. The objective was to derive values of pore size distribution index (λ) and breakthrough pressure (pb) which could then be incorporated into a model for predicting the desaturation kinetics of vacuum filtration. The need to model the vacuum filtration of flocculated systems is important owing to the widespread use of polymer flocculants in fine coat filtration in Australian coal preparation plants

ISSN:0734-9343    

DOI:10.1080/07349340108945631

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

A Brazilian coal jigging refuse was studied as a sorbing material for heavy metal ions such as copper, zinc and nickel. This refuse was characterized in terms of its petrographic composition and surface properties. Metal ions uptake mechanism involved was studied through sorption isotherms, scanning electron photomicrographs scanning electron spectral analysis and zeta potential measurements. Sorption isotherms showed saturation values of the order of 2.2 mEq · g−1at optimal pH of 9.5. Main compounds responsible for the sorption were found to be kaolinite, vitrinite and less quartz and pyrite. Probable mechanisms involved in the sorption were found to be the interfacial complexation between the hydrolyzed species and the negatively charged silicate or carboxylic (at the vitrinite surface) and surface precipitation of the metal hydroxide. Ion exchange was found to have a minor role in this system. It is concluded that because of the affinity and high sorption values for metal ions, this coal jigging refuse has a high potential as sorbing material at a very low cost.

ISSN:0734-9343    

DOI:10.1080/07349340108945632

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor