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silver extraction technology

     

Silver is a sulfur-loving element, and sulfur-containing extractants can be used for its extraction and purification.

Effective extractants for silver include diisooctyl sulfide, dialkyl sulfide, petroleum sulfide, etc. Diisooctyl sulfide has good antioxidant properties and can extract silver from nitric acid medium.

Currently, silver extraction technology is still in the experimental research stage. A factory in China has applied diisooctyl sulfide for silver extraction in small-scale production. In its precious metal refining process, 5-stage extraction is carried out using a centrifugal extractor, with an O/A phase ratio of (1~2):1 and an organic phase extraction capacity of approximately 70 g/L. The silver extraction rate exceeds 99.9%.

Pure silver powder is obtained by reducing the purified stripping solution with hydrazine hydrate at a reduction temperature of 50~60℃. The pure silver powder is then filtered, washed, dried, and cast to produce silver ingots.

For silver extraction using diisooctyl sulfide, the direct recovery rate is over 99%, the total silver recovery rate is more than 99.9%, and the produced silver ingots have a silver content of over 99.9%. Under certain conditions, extraction purification of silver is more economical and reasonable than electrolytic purification.

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