[특허]Methods and apparatus for treating materials in liquids

Methods and apparatus for treating materials in liquids 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B02C-019/18
출원번호	US-0935277 (1992-08-26)
발명자 / 주소	Holl Richard A. (4171-C5 Market St. Ventura CA 93003)
인용정보	피인용 횟수 : 57 인용 특허 : 0

초록 ▼

The method for treating materials in liquids involves passing them with the liquid through a processing gap formed by a flow passage whose walls are closely spaced and move relative to one another transversely to the direction of flow, thereby producing “supra-kolmogoroff”mixing eddies in the gap, and at the same time applying ultrasonic longitudinal pressure oscillations that reverberate between the two closely spaced surfaces into the gap transversely to the direction of flow from transducers mounted on one wall, thereby producing “sub-Kolmogoroff”mixing eddies therein. The method is capable of rapidly producing relatively thick slurries of sub-micrometer particles that otherwise can take several days in conventional high shear mixers and ball or sand mills, or of rapidly dissolving difficultly soluble gases and powders into liquids. One type of apparatus consists of two circular coaxial plates, one stationary while the other is rotated, the opposed faces forming the processing gap being mirror finished; the rotational axis can be vertical or horizontal. Another type consists of an inner cylinder rotatable about a horizontal axis inside a stationary hollow outer cylinder with the facing walls closely spaced at their lowermost parts to form the processing gap. The ultrasonic transducers are mounted on the stationary member. The liquid/material mixture may be recirculated through a single mill or may be passed through a series of mills. The mixture may be pretreated in a high capacity reverbatory ultrasonic mixer before being fed to the mill or series of mills.

대표청구항 ▼

A method for treating materials comprising flowable slurry suspensions of powdered materials in liquid vehicles, the method comprising: passing the material to be treated in a flow path constituted by a passage between two closely spaced passage surfaces provided by respective mill members, the passage having a passage inlet thereto and a passage outlet therefrom, the material passing through the flow path in a corresponding flow direction; the spacing between the passage surfaces decreasing from the passage inlet to a treating zone in which the spacing between the passage surfaces is sufficiently small that the boundary layers of the material at the treating zone passage surfaces intercept one another without an intervening material layer; while the material is passing through the flow path moving at least one of the mill members so as to move the passage surfaces relative to one another in a direction transverse to said flow direction at a relative speed such that supra-Kolmogoroff eddies are produced in the intercepting boundary layers; and applying longitudinal acoustic pressure oscillations to the material in the treating zone between the two relatively moving closely spaced passage surfaces so as to produce therein sub-Kolmogoroff eddies of size smaller than said supra-Kolmogoroff eddies.

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