The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 08, 1992
Filed:
Jun. 24, 1988
Other;
Abstract
Metal values are solubilized from ore by a lixiviant having a pH from 5 to 8, comprising an aqueous solution of a chloride salt and a hypochlorite salt. Cyanuric acid may be added to retard decomposition of the lixiviant. In one alternative embodiment, any remaining hypochlorite ions are then eliminated by adding hydrogen peroxide or a reducing agent to the pregnant lixiviant. Metal values are recovered by reduction using carbon, electrowinning, or other conventional techniques. In an alternative embodiment for extraction of gold or silver, the steps are combined by using finely ground ore containing sulfides or carbonaceous material to both reduce any remaining hypochlorite ions and precipitate the metal values from the lixiviant. The lixiviant can then be regenerated either by electrolysis or addition of hypochlorite salt.