Recovery of metals from their alloys with lead using consummable lance and apparatus
US4734129A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 10, 1986 |
| Grant date | Mar 29, 1988 |
| Priority date | — |
| Expiry date | Jun 10, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A metal, especially silver, may be recovered from its alloy with lead by a method comprising injecting, into the molten alloy, an oxygen-containing gas to oxidize the lead to form lead oxide slag and removing the slag from the molten metal. The oxygen-containing gas is injected into the molten metal through an elongate consumable lance which extends lengthwise of itself from the interior to the exterior of the furnace and which is capable of being fed lengthwise from the exterior to the interior of the furnace through the guide tube as the lance is consumed in the furnace. The lance comprises a first elongate tube for the oxygen-containing gas and a second elongate tube located annularly about the first tube, for a coolant gas. A gas is also injected through the guide tube into the furnace to seal the lance. Also disclosed is a furnace suitable for use in the method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.