US3779469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system and method for a reversed ball mill grinding circuit
Assignee: Westinghouse Electric Corp
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Filing: 1972-02-18
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Granted: 1973-12-18
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Expires: 1992-02-18
Abstract
Abstract The dynamically fast in response and stable control arrangement for a reversed ball mill grinding circuit, which operates in accordance with the basic control algorithm that the new material feed rate to the reversed ball mill grinding circuit is controlled as a function of the net output solids flow production from the production cyclones associated with that grinding circuit plus the integral of the error between the desired solids flow load and the actual solids flow load of the grinding mill associated with that circuit.
Inventors
- 👤 R Putman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:14
CPC Classifications
B; B02; B02C; B02C25/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
54 words
The control system of claim 1, with said predetermined relationship being WR P + Integral (D-L) dt, where WR controls the flow of new ore material to said grinding circuit, P is the output material solids flow, D is the desired load material solids flow and L is the actual load material solids flow.
Claim 2
Dependent Claim
39 words
The control system of claim 1, with the supply of new ore material to said grinding circuit being in accordance with the integral of said difference between the desired load material solids flow and the actual material solids flow.
Claim 3
Dependent Claim
49 words
The control system of claim 1, with said ball mill grinding circuit being operative in a reversed arrangement such that the new ore material passes to said production cyclone before passing to the ball mill and said actual load material solids flow is the underflow from said production cyclone.
Claim 4
Dependent Claim
58 words
The control system of claim 1, with said control of the new ore material feed rate being in accordance with the relationship Werror WR-WA where Werror is the error in said feed rate to be corrected, WR is the desired feed rate established by said predetermined relationship and WA is the actual feed rate of new ore material.
Claim 5
Independent Claim
99 words
A method for controlling a ball mill grinding circuit including at least one production cyclone, including the steps of sensing the solids flow of output material leaving said grinding circuit from said production cyclone, sensing the solids flow of the actual load material passing to said ball mill, establishing a solids flow of the desired load material to pass through said ball mill, and controlling the new ore material feed rate to said grinding circuit in accordance with a predetermined relationship between the respective solids flows of said output material, said actual load material and said desired load material.
Claim 6
Dependent Claim
33 words
The method of claim 6 with said ball mill grinding circuit being operative in a reversed arrangement and said control of the new ore material feed rate effects a substantially constant mill load.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |