After pyrite roasting acid residue remaining dust and collectively referred to as pyrite cinder. The slag mainly contains iron (content is 40-55%), and the gold content in the slag is generally below 2 to 0.5 g/ton, and some may be as high as 3 to 10 g/ton. This part of the gold recycling mainly uses cyanidation. In addition to the preparation of cooling, grinding, etc. of the slag, strong rinsing and chemical treatment are required. Rinse off purpose is copper sulfate, excess acid, a metal chloride, iron salts. These materials increase the consumption of cyanide and lime and the dissolution of passivated gold during cyanidation. The purpose of the chemical treatment is to treat the slurry with alkali, so that the cyanidation effect of the slag is improved and improved, and the leaching rate of gold is increased.
The gold extraction material of a gold cyanide plant in Shandong Province is derived from the gold-bearing sulfur concentrate of six gold mines, and the gold-containing sulfur concentrate is calcined in a boiling furnace to produce acid. The main metal minerals of the slag are hematite and magnetite, followed by a small amount of pyrite and chalcopyrite. The natural gold particle size ranges from 0.009 to 0.0009 mm and the gold content ranges from 3 to 4 g/ton. Among them, monomeric gold accounted for 3.5%, continuous organisms accounted for 76.71%, cracked gold accounted for 1.62%, and packaged gold accounted for 18.17%. The slag by water quenching, grinding, dehydrating thick and a base, using conventional cyanide - gold extraction of zinc powder substitution. The main material consumption of production is: sodium cyanide 1.08 kg / ton, zinc powder consumption 60 g / ton, liquid chlorine consumption 6 kg / ton, lime 15 kg / ton, lead acetate 40 g / ton, steel ball dosage 1.15 kg /Ton. Production indicators are: original ore grade: 3.98 ~ 4.26 g / ton, leaching rate 67.71 ~ 68.50%, washing rate 95.5 ~ 95.71%, replacement rate 98.03 ~ 98.48%, total recovery of gold is 64.28 ~ 63.73%, iron recovery 36.99 to 33.88%. In 1987, a total of 30,103 tons of slag was processed, and a net profit of 940,000 yuan was obtained. The process flow is shown in the figure below.
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