Patent US3837582A successfully refreshed from Google Patents.
US3837582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beneficiation of new york state talc
Assignee: Cyprus Mines Corp
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Filing: 1972-12-27
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Granted: 1974-09-24
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Expires: 1992-12-27
Abstract
Abstract Process of beneficiating Gouverneur, New York talc ore to produce a high purity, platy talc substantially free of tremolite. The process involves crushing the ore and irradiating the crushed ore with short wavelength ultraviolet radiation to cause the talc in the crushed ore to fluoresce predominantly white and the tremolite in the crushed ore to fluoresce a predominantly non-white color. The irradiated crushed ore is then separated into a first portion in which the fluorescent areas of the constituent rocks fluoresce predominantly white, and a second portion in which the fluorescent areas of the constituent rocks fluoresce a predominantly non-white color. The rocks in the first portion are crushed further preferably to a particle size of minus 100 Tyler mesh, and are subjected to at least one froth flotation step. The talc recovered from the froth formed during the last froth flotation step is characterized by a G.E. brightness about 90 and a tremolite content of less than 1.0 percent by weight.
Inventors
- 👤 T Baak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:11
CPC Classifications
B; B03; B03B; B03B13/00; B03B13/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
23 words
The process of claim 1 in which the aqueous slurry is formed by dispersing said first portion of crushed ore in deionized water.
Claim 2
Dependent Claim
29 words
The process of claim 1 including the step of adding a frother to the slurry to improve the separation of the tremolite from the talc during the froth flotation.
Claim 3
Dependent Claim
21 words
The process of claim 3 in which said frother is selected from the class consisting of methyl isobutyl carbinol and isopropanol.
Claim 4
Dependent Claim
26 words
The process of claim 3 in which the amount of frother added to said slurry is less than 0.2 pound of frother per ton of solids.
Claim 5
Dependent Claim
59 words
The process of claim 1 including the step of wetting said crushed ore with water to enhance the contrast in color between the talc and the tremolite constituents of said ore upon exposure to ultraviolet radiation thereby to facilitate the discrimination between rocks to be separated into said first portion and rocks to be separated into said second portion.
Claim 6
Dependent Claim
26 words
The process of claim 1 in which the radiation directed at said crushed ore is characterized by a wavelength of from about 250nm to about 340nm.
Claim 7
Dependent Claim
23 words
The process of claim 1 in which the talc ore is crushed into rocks under 2 inches in size prior to said irradiation.
Claim 8
Dependent Claim
20 words
The process of claim 1 in which said first portion is crushed into a particle size of minus 100 mesh.
Claim 9
Dependent Claim
228 words
The process for the preparation of a high purity platy talc from Gouverneur, New YOrk talc ore including platy talc, fibrous talc, and tremolite as an impurity, which comprises crushing the talc ore, irradiating said crushed ore with ultraviolet radiation characterized by a wavelength of from between 250 and 340nm to cause the talc in said crushed ore to fluoresce predominantly white and the tremolite in said ore to fluoresce predominantly non-white, separating said irradiated crushed ore into a first portion in which the fluorescent areas of the constituent rocks fluoresce predominantly white and a second portion in which the fluorescent areas of the constituent rocks fluoresce predominantly non-white, crushing said first portion into a particle size of minus 100 mesh, forming a dilute aqueous slurry of said crushed first portion in deionized water, said slurry having a solids content not exceeding about 15 percent by weight of said slurry and including a frother to improve the separation of tremolite from the talc in an amount of less than 0.2 pound of frother per ton of ore, subjecting said slurry to at least two consecutive froth flotation steps, removing froth formed during the final froth flotation step, and recovering from said floated froth a high purity platy talc characterized by a G.E. brightness of at least 90 and a tremolite content of less than 1.0 percent by weight.
Claim 10
Dependent Claim
21 words
The process of claim 10 in which the frother is selected from the class consisting of methyl isobutyl carbinol and isopropanol.
Claim 11
Dependent Claim
60 words
The process of claim 10 including the step of wetting said crushed ore with water prior to said irradiation to enhance the contrast in color between the talc and the tremolite constituents of said ore upon irradiation thereby to facilitate the discrimination between rocks to be separated into said first portion and rocks to be separated into said second portion.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |