Abstract
Quality of applied hard coal fuel to combustion processes influence significantly on process efficiency and effects of its influence on surrounding environment. It is particularly important issue in time of Clean Coal Technologies (CTW). The paper presents the analysis of hard coal beneficiation in a jig for getting an optimal recovery of useful fraction in concentrate (combustible matter) and not useful fraction (ash and sulfur). On the basis of industrial sampling of coal dust jig the density analysis of collected samples of concentrate and tailings was performed in laboratory conditions. In separated fractions of separation products the yields of products were calculated and the contents of ash and total sulfur were marked in them. On the basis of the results of density and chemical analyzes, separation products balance and appropriate calculations the Fuerstenau beneficiation curves were plotted which allowed to evaluate process and compare results of beneficiation of material containing various components. This is a different approach to evaluation of coal beneficiation effects, so far being used mainly for multi-component metals ores. Furthermore, the evaluation of separation preciseness on the basis of separation curves and factors was done and the statistical analysis of mutual correlations of analyzed parameters was done.
Highlights
The results of hard coal beneficiation processes were presented usually by means of group of Henry upgrading curves on the basis of performed qualitative and quantitative analyzes and by performing appropriate calculations. This is the simplest method of graphical presentation of beneficiation results based on analysis of contents of certain component in feed, concentrate and tailings according to obtained density fractions
This basic information is often not sufficient because of the fact that separation preciseness determined by maximum accumulation of useful component in concentrate and possibly high amount of not useful ones in tailings becomes more and more important
For the purposes of this work the Fuerstenau upgrading curves were used as a tool to evaluate effects of coal dusts separation process conducted in a jig
Summary
The results of hard coal beneficiation processes were presented usually by means of group of Henry upgrading curves on the basis of performed qualitative and quantitative analyzes and by performing appropriate calculations. This is the simplest method of graphical presentation of beneficiation results based on analysis of contents of certain component in feed, concentrate and tailings according to obtained density fractions. The case of ideal beneficiation is characterized on Henry curve by horizontal line presenting relation between fraction yield and content of useful component [1] This basic information is often not sufficient because of the fact that separation preciseness determined by maximum accumulation of useful component in concentrate and possibly high amount of not useful ones in tailings becomes more and more important. Fuerstenau curves are a good tool to compare selectivity of separation of two
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