Screen cleaning in CIL and CIP systems
US4900430A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1985 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Sep 20, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2011/005
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In carbon-in-pulp (CIP) and carbon-in-leach (CIL) processes, especially those utilizing pure oxygen instead of normal air to increase the overall efficiency of the cyanide leaching-adsorption process in the recovery of gold and/or silver from ores, the screen within each tank which surrounds the slurry outlet is kept clean. The cleaning action is accomplished by linearly reciprocating the screen first slowly in one direction, and then quickly in another (to cause back flushing); or by rotating a cleaning rotor on the inside of a cylindrical screen. The cleaning rotor may be connected to the same shaft as an agitator disposed above a draft tube within the tank. The screen surface is tapered in its direction of movement, and during movement has a tendency to transport and concentrate the carbon (charcoal) particles at the far end of the slow stroke, and the concentrated particles can be withdrawn and recirculated to other tanks in the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.