Posted by Greg1959 on January 14, 2014 at 07:10:29 from (69.176.13.178):
In Reply to: Re: What chemical? posted by Greg1959 on January 14, 2014 at 07:06:27:
In the coal industry, various types of shale and clay are produced as a mixture with the coal. To increase the heating value of the coal and to reduce the hauling costs, a complex process of coal washing is normally used to reduce the total ash content. In this process the coal is graded to a certain size, usually less than six inches, and then fed into a slurry bath in which the density of the media is closely controlled. The coal floats in the heavy media bath while the heavier rocks sink to the bottom.
Here’s how the coal industry’s PR machine sought to characterize this process, from a 1979 ad in the Wall Street Journal: “Raw coal is crushed, exposing more of its natural inner impurities. The crushed coal is passed through a bath of heavy liquid. The lighter “cleaned” coal floats to the top and the heavier impurities sink to the bottom.”
This post was edited by Greg1959 at 07:22:59 01/14/14.
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