US3624796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding of minerals
Assignee: Imerys Minerals Ltd
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Filing: 1970-05-08
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Granted: 1971-11-30
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Expires: 1990-05-08
Abstract
Abstract A process for grinding a dry, or substantially dry, material in which the material is ground with a particulate grinding medium consisting of particles ranging in size from 150 microns to onefourth of an inch, the weight ratio of particulate grinding medium to material being in the range from 2:1 to 5:1. The mixture of material and grinding medium is cooled to prevent agglomeration of the particles of the material.
Inventors
- 👤 Ronald Eric Brociner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:44
CPC Classifications
B; B02; B02C; B02C19/00; B02C19/18; B02C19/186
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
22 words
A process according to claim 1, wherein said cooling of the agitated mixture is effected simultaneously with the agitation of the mixture.
Claim 2
Dependent Claim
19 words
A process according to claim 1, wherein said cooling is effected by passing a cooling fluid through said mixture.
Claim 3
Dependent Claim
13 words
A process according to claim 3, wherein said cooling fluid is a gas.
Claim 4
Dependent Claim
16 words
A process according to claim 3, wherein said cooling fluid is air or a constituent thereof.
Claim 5
Dependent Claim
53 words
A process according to claim 3, wherein said cooling fluid is water or a mixture of water and a gas and wherein the water is passed through said mixture at a rate which lies in the range of from 0.5 to 5.0 cc. per minute per kilogram of said material in said mixture.
Claim 6
Dependent Claim
28 words
A process according to claim 1, wherein said cooling of the agitated mixture is effected wholly or in part by admixing comminuted solid carbon dioxide with said mixture.
Claim 7
Dependent Claim
26 words
A process according to claim 1, wherein said cooling of the agitated mixture is effected wholly or in part by admixing comminuted ice with said mixture.
Claim 8
Dependent Claim
25 words
A process according to claim 1, wherein said particulate grinding medium consists of particles ranging in size from 500 microns to one-eighth of an inch.
Claim 9
Dependent Claim
21 words
A process according to claim 1, wherein said particulate grinding medium comprises quartz, flint, calcined clay, glass or a ceramic material.
Claim 10
Dependent Claim
48 words
A process according to claim 1, wherein the ground material is separated from the particulate grinding medium by screening the mixture on a sieve of a mesh size such that the particulate grinding material is retained by the sieve and the ground material is passed by the sieve.
Claim 11
Dependent Claim
46 words
A process according to claim 1, wherein the ground material is separated from the particulate grinding material by fluidizing the mixture in an upward flowing current of gas, whereby the ground material is carried upwards out of the fluidized mixture leaving behind the particulate grinding material.
Claim 12
Dependent Claim
18 words
A process according to claim 12, wherein the ground material is subsequently collected by means of a cyclone.
Claim 13
Dependent Claim
59 words
A process according to claim 12, wherein said upward flowing current of gas is passed into said mixture through a foraminous plate, which plate has apertures in the range of from 50 to 500 microns, at a velocity in the range of from 10 cm./sec. to 100 cm./sec., whereby the ground material is separated from the particulate grinding medium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |