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Slurry Mixed Clay Problem


Biglou13

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So I slurry mixed some clay approx 1 month ago. Today I was planning on drying clay today. Well trash can full has become a wetter! Like glaze thickness. When I first mixed it was at thick milkshake consistency....... Today it's wet As glaze. I've made plenty of clay this has me stumped?

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Guest JBaymore

Maybe some soluble ingredients in the mixture causing slight defloc.

 

Is there neph sy in there?  Or a soda spar?

 

best,

 

......................john

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Neph Sy yes. It's the galloway cushing clay body.

 

C6 Clay Body - from Val Cushing:

EPK Kaolin 35

Tile 6 Kaolin 15

Nepheline Syenite 23

Flint 22

XX Sagger Ball Clay 5

Bentonite 3

 

I've made this clay a few times.... Slurry, and in walker pug mill. Never had issues

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Guest JBaymore

Clay bodies traditionally use potash feldspars for the sources of flux to develop some glassy phase.  The reason for this is that soda feldspars and feldspathoids are slightly soluble in water.  This can get soda ions into the water... and change the water chemistry so that the reactions with the charges on the surface of the clay platelet crystals change.  This results in some strange behavior of the plastic body.  The ph of the water used can affect this solubility greatly, as can any other ingredients that affect the water's ph.

 

This is why a lot of cone 6 white clay bodies are so squirrely; often neph sy is used to get the flux content up there to lower the range.  And they do NOT tend to age well (or reclaim well).

 

best,

 

............................john

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