Patent · US Active

Hydrometallurgical treatment of anode sludge

US10316389B2 · kind B2 · utility

0Cited by

3References

21Claims

0Family size

Assignee

OUTOTEC (FINLAND) OY · FI

Inventors

Henri Virtanen · Pori, FI
Sönke Schmachtel · Pori, FI

Key dates

Filing date	May 27, 2015
Grant date	Jun 11, 2019
Priority date	—
Expiry date	Feb 3, 2036

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P10/20
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

The present invention provides a method of separating precious metals from anode sludge obtained from copper electrolysis, comprising (a) leaching the anode sludge in an aqueous sulfuric acid solution to remove leachable chlorides and to obtain a first leaching residue depleted of chlorides; (b) pressure leaching the first leaching residue to dissolve Ag and Se and to obtain a first filtrate comprising Ag and Se and a second leaching residue depleted of Ag and Se; and (c) leaching the second leaching residue with an aqueous hydrochloric acid solution to dissolve Au and PGMs to obtain a second filtrate comprising Au and PGMs and a final leaching residue.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.