Method for reblending sand |
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| 申请号 | EP01308888.5 | 申请日 | 2001-10-19 | 公开(公告)号 | EP1245287A3 | 公开(公告)日 | 2004-02-04 |
| 申请人 | HGH Associates Ltd.; | 发明人 | Soldwish-Zoole, Trenton L.; Squires, Franklin E.; | ||||
| 摘要 | A method of reblending sand in a classification tank (10) having multiple stations (14A-J) and discharge valves (16A-C) within each station includes the steps of delivering sand to the tank (10); calibrating the tank to analyze the raw feed material and develop discharge rates, flow multipliers, and a mathematical model of the tank; and inputting a specification or quantity and sieve size distribution for a reblended sand product into a computer (20) for controlling the tank (10). Then the tank (10) is operated in a production mode and the discharge valves (16A-C) at each station of the tank (10) are adjusted by the computer (20) for percent open time and discharge rate. With one algorithm, the computer (20) identifies which station (14A-J) has the most of a sieve size that is out of specification and diverts material at that station by closing the appropriate discharge valve(s) (16A-C). In another algorithm especially adapted to minimize fines, the computer (20) begins with the station (14A-J) most remote from the inlet and diverts material by repeatedly reducing the valve (16A-C) open percentage of the appropriate valve (16A-C) at that station (14A-J) by a given amount until the specification is met or the valve (16A-C) is always closed. Once the valve (16A-C) is always closed, the computer (20) moves a station (14A-J) closer to the inlet and repeats the process. Once a primary product is being produced to specification, the same algorithm can be used to control the production of a secondary product. | ||||||
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