I don't know how hazardous the coal slag is, but here the take it, mix with a
little portland cement and form big blocks out of the stuff. They then haul it
offshore and dump it to form artificial reefs for fish and sea life. Seems
like testing showed it to be pretty harmless stuff, unless as Dave said you
breath it, but then one of the worst things to breath for prolonged periods is
ordinary flour.
Harlan.
---------- Original Message ----------------------------------
From: David Councill <dcouncil@imt.net>
Reply-To: David Councill <dcouncil@imt.net>
Date: Sun, 18 Jun 2000 20:49:43 -0600
>Well, I did mention that the silica, which would be a major component of
>the coal slag, would be in the oxide form. Coal slag is usually bottom coal
>ash that has exceeded its melting point. And as oxides, the material is
>relatively inert and safe, contrary to what some environmentalists say. I
>actually am not too familiar with the free silica issue. I've been out of
>the testing business for five years and can only remember a few requests
>for free silica testing, even when I did air quality. Most particulates are
>hazardous if they get in your lungs, depending on composition, shape, and
>size. So whether you are blasting with coal slag or sand, a dust mask or
>respirator would still be advisable.
>
>I hope this Black Beauty stuff is not too expensive. Its essentially
>recycling an abundant waste product, which is a good thing. I know the
>power plants were trying to find a use for their slag and the ones I worked
>for in Utah actually were trying to use it and market it for sanding winter
>roads.
>
>David
>
>At 10:22 PM 6/18/00 -0400, MGMagnette@aol.com wrote:
>>I took the following off a shot blasting web site...
>> Black Beauty Coal Slag
>>
>>Black Beauty offers a fast cutting, low dusting abrasive which provides high
>>productivity, surface cleanliness, and surface profile.
>>
>> ... Hard Angular Particles, between 6 and 7 on the MOHS Scale
>> ... Uniform Density
>> ... Low Free Silica, less than 1%
>> ... Chemically Inert
>>
>>Free Silica is the part you don't want,.... sand versus this stuff, sand has
>>a much higher free silica component. Thats the stuff that gets in your
>>lungs and is nasty etc.
>>
>>--John
>
>
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