In order to reduce the medium consumption of dense-medium coal separation, trace back the root causes and key factors of high medium consumption, and provide an efficient solution, the limitation of the existing research is examined and the application of Lean Six Sigma to the medium consumption reduction is studied. By defining the waste and defection in the control of medium consumption and a...

INTRODUCTION I t is well known that elements exist in coal in a variety of different modes of occurrence [1,2]. Such modes can vary from the element being totally dispersed in the macerals (e.g. organic sulfur, carboxyl-bound Ca in lignite) to discrete mineral occurrences (e.g. pyrite, FeS,, quartz, SiO,, etc.). Recently, we showed that X-ray absorption fine structure (XAFS) spectroscopy is cap...

Biomass conversion into forms of energy is receiving current attention because of environmental, energy supply and agricultural concerns. This objective of this paper is to report on the environmental, energy, economic, and technological aspects of using switchgrass (panicum virgatum) as a replacement for coal in power generation. To examine the effects of such a substitution, an environmental ...

Carbon-enriched fractions have been obtained from two coal fly ash (FA) samples. The FA came from two pulverized-coal fired power stations (Lada and Escucha, Spain) and were collected from baghouse filters. Sieving was used to obtain carbon-enriched fractions, which were further subjected to two beneficiation processes: acid demineralization using HCl and HF, and oil agglomeration using soya oi...

introduction the alborz structural zone in northern iran is the host of a number of important coal deposits. the gheshlagh coal mine is one of them, which is located 35 km southeast of azadshahr. coal bearing strata in the gheshlagh mining district occur in the middle part of the lower jurassic shemshak formation which consists mainly of shales, siltstones and sandstones. the geshlagh coals hav...