Recovery of silver from silver-containing solutions
AssigneeLeuven Research & Development VZW
InventorsAdrien Edgard Henri Julien Cremers, Andre Petrus Adolf Maes, Jozef Leonia Pleysier
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Abstract
Silver is recovered from silver-containing solutions such as waste waters from the photographic and electroplating industries, by treating such solutions with a cation exchanger in the presence of thiourea or thiourea derivatives. The cation exchanger may be selected from tectosilicates, phyllosilicates and organic cation exchangers.
Claims13
A process of recovering silver from silver-containing solutions, which comprises treating such solution with a cation exchanger in the presence of a thiourea material.
The process of recovering silver from silver-containing solutions, which comprises the steps of:
- a. forming silver-thiourea complexes in said solution by adding thiourea material thereto;
- and
- b. adsorbing said silver-thiourea complexes on a cation exchanger.
In a process for recovering silver from a silver-containing solution which comprises the steps of adsorbing the silver on a cationic exchange material and then recovering the silver from the cationic exchange material, the improvement which comprises:
- adding thiourea material to the silver-containing solution in amount sufficient synergistically to increase the amount of silver recovered.
Dependencies are inferred from the claim text.