Multistage micro powder sorting method and micro powder sorting device for implementing method

Abstract

The invention discloses a multistage micro powder sorting method and a micro powder sorting device for implementing the method. The multistage micro powder sorting device comprises a sedimentation container, a stirrer and at least two fine powder layer liquid extracting devices, the stirrer is used for stirring fine powder liquids filled in the sedimentation container, the fine powder layer liquid extracting devices correspond to corresponding grades of fine powder layer liquids, each fine powder layer liquid extracting device comprises a material extracting pump and a material storing box, the material extracting pumps are used for extracting fine powder layer liquids in the sedimentation container, the material storing boxes are communicated with the material extracting pumps, and discharging ports of the material storing boxes are used for being communicated with corresponding sedimentation separating devices. By means of the method and the device, the period from multistage sorting to finally obtained micro powders of each grade is greatly shortened compared with that of existing methods from coarse sorting to fine sorting in the complete process from fine sorting to coarse sorting of the micro powders, the production efficiency is substantially improved, the method and the device are particularly suitable for volume production of the micro powders, and simultaneously the continuous operation of the entire production process is facilitated.

Description

technical field [0001] The invention relates to a multi-stage micropowder sorting method and a micropowder sorting device implementing the method, and is especially suitable for sorting superhard abrasive micropowders such as CBN and diamond. Background technique [0002] Diamond micropowder, CBN micropowder (cubic boron nitride micropowder) and other superabrasives, due to different usage methods and purposes, the micropowder still needs further sorting after crushing. The principle of the micropowder separation method is: in the same medium, the sedimentation velocity of the material is proportional to the square of the diameter of the material; that is, the larger the diameter of the material, the faster the sedimentation speed. The micropowder sorting method used in the prior art is generally to settle the feed liquid containing micropowders of different particle sizes. After settling for a period of time, the material in the lower layer is the micropowder with the requi...

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Problems solved by technology

However, this micropowder sorting method can only classify the micropowder particles from coarse to fine. The larger the particle size of the micropowder, the shorter the sorting time will be. On the contrary, the smaller the particle size of the micropowder, the longer the sorting time will be. The existing coarse-to-fine sorting method can only complete the whole sorting process after the micropowder in the smallest particle size range is separated and proceed to the next sorting process. In a complete coarse-to-fine sorting process, The sorting cycle is the accumulation of the sorting time of micropowders with different particle sizes, and the cycle is long. Therefore, the existing sorting method from coarse to fine is not conducive to continuous production and improvement of production efficiency, and is not suitable for mass production of micropowders.

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