| 摘要 |
The present invention concerns a method for sizing of mineral matter using a sizing aid additive comprising glycerol and/or at least one polyglycerol allowing the efficiency of air sizing to be increased, or involving a specific sizing energy which is reduced relative to an additive-free air sizing, whilst obtaining a sized mineral matter compatible with an application in an aqueous medium.;It also concerns the use of the product obtained in this manner, in paint, plastic, food applications destined for human or animal consumption, pharmaceutical formulation, paper pulp or paper coating. |
| 主权项 |
1. A product obtained by a method of sizing of mineral matter comprising the following steps:
a) supplying at least one mineral matter comprising dolomite, or talc, or titanium dioxide, or alumina, or kaolin, or calcium carbonate, or any blend thereof; b) supplying at least one sizing aid additive:
(i) consisting of glycerol, in an aqueous or pure form; or(ii) consisting of glycerol with one or more of the following agents: ethylene glycol, monopropylene glycol, triethylene glycol, an inorganic acid or an inorganic acid salt, formic or citric acid or a formic or citric acid salt, an organic polyacid or an organic polyacid salt, an alcanolamine, a poly(ethylene imine), a polyalkylene glycol polymer of molecular mass by weight of between 200 g/mole and 20,000 g/mole, a polyalkylene glycol polymer of molecular mass by weight of between 600 g/mole and 6,000 g/mole, a carbohydrate having a root mean square of the radius of gyration equal to or less than the modal radius of the mineral matter, one or more polyglycerols, wherein the agent or agents are in the aqueous or pure form, or(iii) comprising one or more polyglycerols in the absence of glycerol; c) bringing into contact, once or several times, the mineral matter from step a) with the sizing aid additive of step b) in one or more dry grinding and/or dry blending steps; d) undertaking at least one sizing step of the mineral matter obtained in step c) in a gaseous environment, in order to obtain at least two fractions of particles of different average particle sizes; and e) optionally repeating steps c) and/or d) on all or part of the sized mineral matter resulting from step d). |
