EP 3426825 B1 20200506 - ELECTROLYTIC REFINEMENT OF RAW GOLD
Title (en)
ELECTROLYTIC REFINEMENT OF RAW GOLD
Title (de)
ELEKTROLYTISCHE RAFFINATION VON ROHGOLD
Title (fr)
AFFINAGE ÉLECTROLYTIQUE D'OR BRUT
Publication
Application
Priority
- DE 102016104237 A 20160309
- EP 2017055604 W 20170309
Abstract (en)
[origin: WO2017153547A1] The invention relates to a method for obtaining fine gold by the electrolytic refinement of raw gold contaminated with accompanying elements, wherein the electrolysis is performed in a bath, which is divided by a membrane impermeable to gold-containing anions into a first region having the electrolyte solution that dissociates hydrochloric acid and a second region having the electrolyte solution that dissociates sulfuric acid. The raw gold is anodically dissolved in a first step and is cathodically deposited as once-refined fine gold in a second step, and the once-refined fine gold is anodically dissolved in a third step and cathodically deposited as twice-refined fine gold (having a purity of up to 99.999%) in a fourth step. The formation of a solid silver chloride coating on the anode in the electrolyte solution is prevented or reduced by adding urea and applying ultrasound to the anode.
IPC 8 full level
C25C 1/20 (2006.01)
CPC (source: EP)
C25C 1/20 (2013.01)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
WO 2017153547 A1 20170914; CN 109312481 A 20190205; CN 109312481 B 20201016; DE 102016104237 A1 20170914; EA 036684 B1 20201208; EA 201892012 A1 20190228; EP 3426825 A1 20190116; EP 3426825 B1 20200506; ES 2811380 T3 20210311; PL 3426825 T3 20210406; PT 3426825 T 20200820
DOCDB simple family (application)
EP 2017055604 W 20170309; CN 201780028624 A 20170309; DE 102016104237 A 20160309; EA 201892012 A 20170309; EP 17713591 A 20170309; ES 17713591 T 20170309; PL 17713591 T 20170309; PT 17713591 T 20170309