Patent US3844303A successfully refreshed from Google Patents.
US3844303A
Expired / Lapsed
US
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Lime control method for highly alkaline flotation pulps
Assignee: Kennecott Utah Copper LLC
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Filing: 1972-12-13
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Granted: 1974-10-29
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Expires: 1992-12-13
Abstract
Abstract Alkalinity of the flotation pulp in a high alkalinity flotation circuit is controlled automatically by continuously measuring electrical conductivity of such pulp and controlling the addition of lime to the circuit in accordance with changes in the conductivity resulting from deviations of alkalinity of the pulp from a pre-established norm.
Inventors
- 👤 A Moon
- 👤 R Vaughn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:51
CPC Classifications
G; G05; G05D; G05D21/00; G05D21/02; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329; Y10T137/034; Y10T137/2496; Y10T137/2499; Y10T137/2509
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
A method of controlling lime additions to an alkaline flotation circuit operating on a sulfide mineral ore in order to substantially maintain a predetermined degree of alkalinity in the flotation pulp of such circuit at or above a pH of about 9, comprising continuously sensing the electrical conductivity of the flotation pulp in said circuit; continuously comparing the values of electrical conductivity so obtained with a preset value of electrical conductivity corresponding to said predetermined degree of alkalinity; and controlling lime additions to said flotation circuit in accordance with deviations of the sensed values of electrical conductivity from said preset value.
Claim 2
Independent Claim
101 words
A method of controlling lime additions to an alkaline flotation circuit operating on a sulfide mineral ore in order to substantially maintain a predetermined degree of alkalinity in the flotation pulp of such circuit at or above a pH of about 9, comprising continuously sensing the electrical conductivity of the flotation pulp in said circuit; continuously comparing the values of electrical conductivity so obtained with a preset value of electrical conductivity corresponding to said predetermined degree of alkalinity; and controlling lime additions to said flotation circuit in accordance with deviations of the sensed values of electrical conductivity from said preset value.
Claim 3
Dependent Claim
25 words
A method in accordance with claim 1, wherein the predetermined degree of alkalinity to be maintained is at or above a pH of about 11.5.
Claim 4
Dependent Claim
53 words
A method in accordance with claim 1, wherein the flotation pulp contains a significant quantity of magnetite; the pulp is monitored for the effect of such magnetite on the conductivity measurements; and the preset value of electrical conductivity is changed from time to time in accordance with quantity of magnetite in the ore.
References Cited (Backward Citations)
US1450023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |