Elution process and apparatus and extraction of particulate material from a vessel
US4555385A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 19, 1983 |
| Grant date | Nov 26, 1985 |
| Priority date | — |
| Expiry date | Aug 19, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An introduction process and apparatus is described concerning the continuous elution of a value, i.e. a metal value such as gold, from a particulate carrier by a counterflow of stripping liquid through the pressurized vessel in which the loaded particulate carrier is introduced to the vessel as a low velocity plug in a liquid carrier. The extraction process is also used with the continuous elution process in which the particulate material is extracted from the bottom part of a pressure vessel through a discharge pipe extending therefrom and in which a discharge liquid is introduced into the discharge pipe upstream of the discharge end under such pressure as to maintain a head of the discharge liquid upstream of that location and a flow of the liquid downstream from the location to transport the particulate material through the discharge pipe. The length of the pipe allows a pressure drop in the particulate material whereby it is discharged at ambient pressure without mechanical working of the material and the discharge liquid may also act to cool the material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.