David Hendley on tue 26 aug 03
Your chemical analysis is interesting. I figure it adds up to about 270%.
"Limestone" is calcium carbonate, or whiting. There is often some
magnesium present in limestone, hence their label of "dolomitic limestone".
The dolomite you buy from your ceramic supplier would have even more
magnesium present (I think, the excess abundance of numbers makes it
a little confusing).
As a start, I would use this material as a direct 1-for-1 replacement for
my whiting.
David Hendley
david@farmpots.com
http://www.farmpots.com
----- Original Message -----
> In looking at the bag of lime, I reviewed the chemical analysis as shown
> below.
>
> Elemental Calcium.......... 28%
> Calcium Oxide................39%
> Calcium Carbonate.........70%
> Elemental Magnesium...... 6%
> Magnesium Oxide............11%
> Magnesium Carbonate......22%
> Calcium Carbonate ..........96%
>
> The bag labeling calls it "Pulverized Dolomitic Limestone". It is an
> extremely fine powder.
>
> My question is...... can this stuff be used somehow in a glaze?? Anyone
> got any experience or ideas?
John Rodgers on tue 26 aug 03
I just had a muriatic spill on the floor of my van. Nasty stuff - made a
hole in the carpet and some other damage.
Manufacturer recommended procedure --- cover with dry lime, scrub in,
then add just a bit of water to dissolve the lime and transport the
solution to the acid in the fibers. seems to work. Got a mess to clean
up though.
In looking at the bag of lime, I reviewed the chemical analysis as shown
below.
Elemental Calcium.......... 28%
Calcium Oxide................39%
Calcium Carbonate.........70%
Elemental Magnesium...... 6%
Magnesium Oxide............11%
Magnesium Carbonate......22%
Calcium Carbonate ..........96%
The bag labeling calls it "Pulverized Dolomitic Limestone". It is an
extremely fine powder.
My question is...... can this stuff be used somehow in a glaze?? Anyone
got any experience or ideas?
An associated aside, I just learned there is a marble quarry nearby that
produces a white marble. Lots of marble dust available. Also, close by
is a large quarry for Alabaster as well.
So, chemically these are common things that wind up as glaze materials.
Any input, comment, suggestions about what could be done with all this
would be appreciated.
Regards,
John Rodgers
Birmingham, AL
iandol on wed 27 aug 03
Dear John Rodgers,
Why not use your Dolomitic Limestone. But I wouldn't trust the analysis =
for calculation purposes. Would substitute on a one for one against =
Whiting. Might impose a softer translucency with a satin mat surface. =
But that would depend upon the true Magnesia content.
Or use it a Neutroceutical. Dose; Say two to four grams per day. Do a =
Google for Magnesia and Human Nutrition.
Best regards,
Ivor Lewis. Redhill, South Australia.
Louis Katz on wed 27 aug 03
Slaked lime is a real flocculant. It is difficult to use. That does
mean it can't be. If you have acid soil it might be better on your
garden after slaking.
Louis
Ron Roy on wed 27 aug 03
A strange way to express % but this is how to read it.
We need the analysis in percent including the LOI.
CaO - 39.0%
MgO - 11.0
Loi - 50.0
But it'd not as simple as that - there is still something missing because -
if you add up the carbonates CaCO3 and MgCO3 you only get 92%. So there is
probably some SiO2, Al2O3 and some Fe2O3 and some moisture.
In the end it is neither Whiting or Dolomite but in between and closer to
Whiting.
If you get a proper analysis done you may fine it useful in glazes that
call for both CaO and MgO but if the iron is high that may limit it's use
even further.
Considering the cost of both Whiting and Dolomite I'd say it's not worth
the trouble.
RR
>> In looking at the bag of lime, I reviewed the chemical analysis as shown
>> below.
>>
>> Elemental Calcium.......... 28%
>> Calcium Oxide................39%
>> Calcium Carbonate.........70%
>> Elemental Magnesium...... 6%
>> Magnesium Oxide............11%
>> Magnesium Carbonate......22%
>> Calcium Carbonate ..........96%
>>
>> The bag labeling calls it "Pulverized Dolomitic Limestone". It is an
>> extremely fine powder.
>>
>> My question is...... can this stuff be used somehow in a glaze?? Anyone
>> got any experience or ideas?
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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