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In this research, it is aimed to recover the gold from slags generated in the jewelry waste recycling process applied to obtain gold / silver from jewelry waste under suitable conditions by gravity separation and it has been explored whether it is possible to produce high grade / efficient gold pre-concentrate to reduce costs and maximize the recovery of precious metals. The Knelson centrifugal concentrator was used in enrichment studies by gravity separation. It has been determined that the composition of soda-borate based slag with a Au grade 7 g/t consists of relatively high Fe2O3 (13.25%) and PbO (11.38%), and the gold was concentrated in the fraction of -0.5 + 0.212 mm (34%) as a result of the size classification. The influence of operating conditions parameters of Knelson concentrator (washing water pressure, centrifugal force, feed rate, pulp solids ratio, etc.) and feed product particle size on Au grade and gold recovery efficiency of concentrate / waste were investigated. Considering the recovery rate of gold and the amount of gold in the tailings, it was determined that the effect of washing water pressure, centrifugal force and feed rate on the separation performance was limited, and the feed product particle size was effective on concentrate Au grade. A final concentrate containing 16 g/t of Au (Au grade of tailing: 3 g/t) was obtained with 72.4% recovery rate from the slag with 7 g/t Au grade at optimized conditions. In case of applying with the feed product sized of -0,212 mm, where the gold shows the highest distribution by size fraction, the Au grade of the concentrate increased significantly to 30 g/t.

Recovery of Gold From Slags Generated in the Jewelry Waste Recycling Process by Gravity Separation