Silver ore dressing method

At present, China has proven reserves of silver ore is divided into two parts, one is the silver grade of the industrial index has reserves of silver mining value independent of the other part refers to the silver grade is lower than the industrial index, with the main elements of the way mining and comprehensive recovery Associated silver ore reserves. So how does China process mineral processing of these silver resources?

The ore dressing of independent silver mines mainly based on the production of silver in China basically adopts the flotation method to select silver, while the common and associated silver mines adopt the combination of single flotation method, float-re-election method and flotation-cyanide method. The process is for beneficiation, with flotation being the most important.

In order to improve the recovery rate of independent silver mine flotation, China has also taken three measures: First, aiming at the thickness characteristics of silver mineral inlay grain size, as far as possible to fully dissociate silver minerals and improve the recovery rate of silver; Neutral or weakly alkaline flotation slurry alkalinity and the use of sodium carbonate as a flotation slurry adjuster to improve the floatability of silver; third, the use of xanthate and black medicine to enhance the ability to capture silver.

After silver ore beneficiation process, the resulting products are silver ore concentrates containing silver, silver colored mud and various metals. At present, the former two are usually subjected to pyrolysis (reverberation furnace, electric furnace, crucible, blast furnace, flash furnace), or by hydrometallurgical separation and extraction, and then electrolytic refining; the latter is mainly in the process of smelting non-ferrous metals. Semi-silver is enriched and integrated into the anode mud (mainly copper and lead anode mud). In China, 98% of silver is recovered from smelting anode mud of various non-ferrous metal mines.

In recent years, under the encouragement of a series of preferential policies of the country, China has been strengthened in the comprehensive mineral processing and recovery of common and associated silver mines. Many mines and refineries have attached great importance to the recovery of silver. The mineral processing technology and equipment have developed to some extent. The recycling rate is also increasing.

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