PJLewing@aol.com on fri 19 jul 96
I've just gotten involved with a manufacturing process that generates, as a
by-product, quite a bit of garnet dust. The manufacturer would like to know
if there is a use for this used stuff, as he is now throwing away lots of it-
hundreds of pounds, I think. It's a very, very, fine powder, with a little
contaminant of other materials- sometimes wood, or ceramic, or metals of
various kinds.
Does anyone out there know the chemical makeup of garnet? I was wondering if
it might have a ceramic application. But he would be happy if there were
anything it would be used for. His concern is first, just the cost of
dumping it, and second the fact thaat it's being wasted. Any ideas?
Paul Lewing, Seattle
Richard Aerni on fri 19 jul 96
At 01:39 PM 7/19/96 EDT, you wrote:
>----------------------------Original message----------------------------
>I've just gotten involved with a manufacturing process that generates, as a
>by-product, quite a bit of garnet dust. The manufacturer would like to know
>if there is a use for this used stuff, as he is now throwing away lots of it-
>hundreds of pounds, I think. It's a very, very, fine powder, with a little
>contaminant of other materials- sometimes wood, or ceramic, or metals of
>various kinds.
>Does anyone out there know the chemical makeup of garnet? I was wondering if
>it might have a ceramic application. But he would be happy if there were
>anything it would be used for. His concern is first, just the cost of
>dumping it, and second the fact thaat it's being wasted. Any ideas?
>Paul Lewing, Seattle
>
>
Paul,
Garnets comprise a group of isomorphous minerals with the general formula
X3Y2(SiO4), where X may be Calcium, Magnesium, Iron (+2) or Manganese (+2),
and where Y may be Aluminum, Iron (+3) or Cromium, and sometimes partly
Titanium or Manganese (+3). There is extensive substitution of the various
minerals, so it would be tough to come up with an accurate formula.
Because of garnets hardness (7-7 1/2 on the Mohs scale) and its lack of
cleavage planes, its main commercial usage is as an abrasive.
Sounds like it could be fun to play with, though.
Hope this helps, if only a little,
Richard
Kelley M. Dean on sat 20 jul 96
Actually there is a use besides as an abrasive, and I don't know if ti is
feasible now. but in the 17th, 18th and I believe the 19th centuries they
used garnet dust as the primary pigment in the paint used on red barns.
Alittle known fact, and I don't know if it helps at all, but you never know...
>----------------------------Original message----------------------------
>At 01:39 PM 7/19/96 EDT, you wrote:
>>----------------------------Original message----------------------------
>>I've just gotten involved with a manufacturing process that generates, as a
>>by-product, quite a bit of garnet dust. The manufacturer would like to know
>>if there is a use for this used stuff, as he is now throwing away lots of it-
>>hundreds of pounds, I think. It's a very, very, fine powder, with a little
>>contaminant of other materials- sometimes wood, or ceramic, or metals of
>>various kinds.
>>Does anyone out there know the chemical makeup of garnet? I was wondering if
>>it might have a ceramic application. But he would be happy if there were
>>anything it would be used for. His concern is first, just the cost of
>>dumping it, and second the fact thaat it's being wasted. Any ideas?
>>Paul Lewing, Seattle
>>
>>
>Paul,
>
>Garnets comprise a group of isomorphous minerals with the general formula
>X3Y2(SiO4), where X may be Calcium, Magnesium, Iron (+2) or Manganese (+2),
>and where Y may be Aluminum, Iron (+3) or Cromium, and sometimes partly
>Titanium or Manganese (+3). There is extensive substitution of the various
>minerals, so it would be tough to come up with an accurate formula.
>Because of garnets hardness (7-7 1/2 on the Mohs scale) and its lack of
>cleavage planes, its main commercial usage is as an abrasive.
>Sounds like it could be fun to play with, though.
>
>Hope this helps, if only a little,
>
>Richard
>
>
Kelley Dean
Fredrick Paget on thu 14 oct 04
>Does the dust from sandblasting with garnet cause
>silicosis or some equally loathesome disease?
>
>Thanks,
>Annie Evans
>Oh yes, and as an added bonus you get dust of what ever you blast
>off. Lead paint~ Zinc~rust, you name it. wear a really good
>respirator and eye protection.( say I, who has already lost one eye
>to accident.) Ideally sand blasting should be in a closed box with a
>window and rubber gloves to reach in that are sealed to the box.
>That is for small things.
Fred
>
>__
--
From Fred Paget, Marin County, California, USA
fredrick@well.com
Andrea Evans on thu 14 oct 04
Does the dust from sandblasting with garnet cause
silicosis or some equally loathesome disease?
Thanks,
Annie Evans
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Edouard Bastarache Inc. on thu 14 oct 04
Yes,
if the process generates enough respirable crystalline silica over
a sufficient period of time without proper respiratoty protection.
What is garnet made up of?
Later,
"Ils sont fous ces quebecois"
Edouard Bastarache
Irreductible Quebecois
Indomitable Quebeker
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
www.sorel-tracy.qc.ca/~edouardb/Welcome.html
http://perso.wanadoo.fr/smart2000/index.htm
http://www.digitalfire.com/education/toxicity/
Ivor and Olive Lewis on fri 15 oct 04
Dear Andrea Evans,
Garnet is a natural mineral, a hard silicate compound which is treated
as a gemstone when it has fine colour and clarity.
It is used in preference to Silica sand to overcome the shortcomings
of raw silica.
Nevertheless, all blast cleaning operations raise dust, so should be
treated with respect. Precautions should be taken to protect your own
well being if you intend using this technique. Wear a proper mask,
guard your eyes.
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
Ivor and Olive Lewis on wed 19 oct 05
Dear Bill Edwards,
Sounds as though your have the makings of some sort of Celadon.
As always start at the beginning. Line blends with your favourite =
Melting Agents. Then do a Currie or an open ended 6*6 tile with a white =
clay, and auxiliary flux and Silica, selecting the least crazed sample =
from the line blends.
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
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