The thinning effect (deflocculation) in wet-ground highly concentrated composite suspensions (90% bauxite + 10% quartz glass) is studied. The thinning agents used are sodium tripolyphosphate, SB-5 organic plasticizer, and mixtures thereof. Maximum thinning effect is attained with a composite organic mineral additive (20 – 35% SB-5 + 65 – 80% sodium tripolyphosphate). Optimum concentration of the additive is found to be 0.08 – 0.1%, or 0.4 – 0.5 mg/m2 solid-phase surface. At optimum composition and additive concentration, the thixotropic dilatant flow regime of HCBS changes to a dilatant flow regime with a sharp decrease in viscosity and an increase in density of cast preforms. A mechanism for the thinning effect due to additives is considered.
Refractories and Industrial Ceramics – Springer Journals
Published: Oct 17, 2004
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