초록 ▼

An aqueous slurry of mineral particles, for example calcium carbonate and/or calcium hydroxide, has a mineral solids concentration of at least 40% m/m and contains an agent that maintains the slurry at a pumpable viscosity but that acts as a flocculant upon dilution of the slurry. Suitable agents in

An aqueous slurry of mineral particles, for example calcium carbonate and/or calcium hydroxide, has a mineral solids concentration of at least 40% m/m and contains an agent that maintains the slurry at a pumpable viscosity but that acts as a flocculant upon dilution of the slurry. Suitable agents include cationic and amphoteric polyelectrolytes having nitrogen-containing groups, for example polyamines and dimethyl diallyl ammonium chloride polymers. The slurries may contain other components for example a synthetic hectorite or a dispersing agent such as a polyacrylate, polymethacrylate or polyphosphate. The slurries are useful in papermaking and in the treatment of sewage.

대표청구항 ▼

A composition for treating an aqueous system, which composition comprises (a) an aqueous slurry of mineral particles of at least 40% m/m mineral solids concentration, characterised in that it also comprises (b) an agent or mixture of agents that at least substantially maintains the mobility of the s

A composition for treating an aqueous system, which composition comprises (a) an aqueous slurry of mineral particles of at least 40% m/m mineral solids concentration, characterised in that it also comprises (b) an agent or mixture of agents that at least substantially maintains the mobility of the slurry, such that the apparent viscosity of the slurry does not exceed 500 cP (as measured at a shear rate of 600 s-1) and that exerts a flocculating action upon dilution of the composition with or into water at a dilution ratio of at least 20:1 (m/m), said agent(s) being selected from cationic polyelectrolytes that have nitrogen-containing groups, amphoteric polyelectrolytes that have nitrogen-containing groups and, provided that the mineral particles include calcium hydroxide particles, anionic polyacrylamides. *** BRS DOCUMENT BOUNDARY ***