Method and apparatus for preparing superfine powder by super high pressure supercritical fluid micro jetting technology

Abstract

The present invention belongs to the field of superfine powder preparing technology and proposes one new kind of superfine powder preparing method and apparatus. Super high pressure technology, supercritical fluid technology and micro jet crushing technology are combined and used in preparing submicron level superfine powder. The new method needs no grinding medium and solvent, and has high energy utilization and easy separation between the product and the work medium.

Description

technical field [0001] The invention belongs to the technical field of ultrafine powder. [0002] The present invention proposes a new preparation method of ultra-fine powder, which combines the characteristics of ultra-high pressure technology, supercritical fluid technology and micro-jet pulverization technology, combines the three advanced technologies, and develops a new A method and equipment for ultrafine pulverization, which can be used to prepare submicron ultrafine powders under corresponding process conditions. Background technique [0003] There are various methods for the preparation of ultrafine powders. At present, scholars at home and abroad generally divide the preparation methods of ultrafine powder into two categories: physical methods and chemical methods. The physical method has derived the pulverization method and the construction method; the chemical method has derived the precipitation method (solution reaction method), hydrolysis method, spray metho...

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Problems solved by technology

[0006] Among the above pulverization methods, ball mills, vibration mills and stirring mills have the following disadvantages due to the use of grinding media: (1) the size of the grinding media determines that the prepared ultrafine powder is difficult to reach the submicron level; (2) The wear of the grinding media causes impurities to be mixed in the product, reducing the purity of the product

The energy utilization rate of the jet milling method is low, and it is difficult to make the ultrafine powder level reach the submicron level after repeated long-term treatment

In the micro-jet pulverization method, due to the high viscosity and low diffusivity of the liquid caused by high pressure, the energy of impact pulverization is reduced, and the pulverization level cannot be improved.

In addition, the product must be dried before it can be separated from the liquid, which takes a long time and the subsequent separation is energy-intensive

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