Method of precious metal recovery

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 11/00 (2006.01) C22B 1/04 (2006.01) C22B 3/10 (2006.01)

Patent

CA 2738685

The invention relates to methods of precious metals recovery and may be applied to the recovery of precious metals from mineral raw materials containing chlorides of alkali and earth metals, e.g. slimes of potassium production. The method includes the following: excessive chlorides and water are separated from the slimes containing precious metals and chlorides of alkali and earth metals, after which the slimes are forwarded to drying and roasting at the temperature of 850-950°C, and then the cider is leached by diluted solution of hydrochloric acid. The precious metals are recovered from produced pulp by sorption with the help of resin (e.g. AM-2B).

Linvention concerne des procédés dextraction de métaux précieux et peut être utilisée afin dextraire des métaux précieux de matières premières minérales contenant des chlorures de métaux alcalins et alcalino-terreux, par exemple des boues issues de lindustrie potassique. Le procédé consiste à séparer les chlorures excédentaires et leau des boues contenant des métaux précieux et des chlorures de métaux alcalins et alcalino-terreux, les boues étant ensuite soumises à un séchage et à une calcination à une température de 850 à 950°C, après quoi les résidus de calcination sont lessivés avec une solution dacide chlorhydrique diluée. Les métaux précieux sont ensuite récupérés par sorption de la boue ainsi obtenue en utilisant une résine (par exemple, AM-2B).

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