Lecture #5 - Alfred's Clay Store - Alfred University

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Flocculation• <strong>Clay</strong>s are usually slightly flocculated in theirnatural state• We can increase flocculation to improve cohesion(strength) by adding flocculants– Ball clays and Bentonites (and coarser clays to a lesserdegree)– Vinegar (temporarily effective), Magnesium Sulphate(MgSO 4 •7H 2 O; a.k.a. Epson salts {caveat…scumming}), Calcium Chloride (CaCl 2 ), etc…– Possibilities for research…especially in porcelainbodies???
• Deflocculation involves increasing therepulsion between particles• Decreases viscosity/destroys plasticity• We will look at deflocculation when wediscuss slips
Page 1 and 2: Water,Workability,and MixingLecture
Page 3 and 4: Types of Water
Page 5 and 6: Water of Plasticity For Clays• Va
Page 7 and 8: Pore Water• Occupies the pores of
Page 9 and 10: Crystal-Edge Water• Water that is
Page 11 and 12: PlasticityHaving looked at the stru
Page 13 and 14: Initial ResistanceMovementbeforecra
Page 15 and 16: Plastic Flow in a Typical BodyShear
Page 17 and 18: Particle Size• Smaller particle s
Page 19 and 20: • QuantifyingPlasticity• Benton
Page 22 and 23: Flocculation• A Clay particle exh
Page 26 and 27: Particle ShapeClay• Flatness of c
Page 28 and 29: Diversity in particle size ensures
Page 30 and 31: Narrow rangeWide range
Page 32 and 33: CPFT = Cumulative Percent Finer Tha
Page 34 and 35: Moisture Content• As we’ve alre
Page 36 and 37: Moisture Retention• Fine clays ho
Page 38 and 39: Souring• Secondary clays tend to
Page 40 and 41: Mixing• Homogenous mixtures are c
Page 42 and 43: Relative scale of materials in a cl
Page 44 and 45: Given what we now know aboutrelativ
Page 46 and 47: Soldner Mixer• The safest clay-mi
Page 49 and 50: Mixing ChronologyFor the Muller•
Page 51 and 52: Blunging• Ensures complete/homoge
Page 54 and 55: • High speed shear head(cuts like
Page 56 and 57: Regular MixingHigh Intensity Mixing
Page 58 and 59: • Pumps (pushes)slip into porouse
Page 61 and 62: Pugging• Pugging helps break down
Page 63: The shredder stage• Air pockets a
Page 70: ReferencesThe Chemistry and Physics

Lecture #5 - Alfred's Clay Store - Alfred University

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