Patent ID: 7238331

Claim:
A process for preparing nano-powders and nano-particle loose aggregate powders, comprising the steps of: (a) providing at least two reactant solutions A and B which can react with each other quickly to form precipitate; (b) feeding the at least two reactant solutions A and B to a mixing and reaction precipitator separately which is at least one selected from a group consisting of tubular ejection mixing reactor, tubular static mixing reactor and atomization mixing reactor at a temperature not lower than the reaction temperature for continuous and orderly mixing, reaction and precipitation, where the at least two reactant solutions A and B react with each other in a form of micro-liquid aggregate and form a precipitate-containing slurry; (c) post-treating the precipitate-containing slurry discharged continuously and orderly from the reaction precipitator, wherein in step (b), said tubular ejection mixing reactor comprises an inlet for ejecting the reactant solution A, an inlet for the reactant solution B and a mixing and reaction zone, where said reactant solutions A and B are rapidly dispersed and pulverized to micro-liquid aggregates in finely divided form with intense turbulent flow and then react with each other to form precipitate.