Gold-arsenic ore processing

Native gold - arsenic ores usually contain 1% to 2% to 10% to 12% arsenic, pyrite. Other sulfide minerals are mainly pyrite and pyrrhotite. When the sulfide minerals in the ore contain particulate gold, the ore may be treated by a combined method of cyanidation or first flotation and re-flotation of the concentrate. When most of the gold in the ore is encapsulated in sulfide, the ore may be subjected to mixed flotation to select gold-arsenic concentrate or gold-arsenic-pyrite concentrate. If the mixed tailings do not result in the waste tailings, the mixed flotation tailings may be cyanated or all ore may be cyanated and then the gold sulfides recovered from the cyanide tailings.
In order to improve the flotation index of gold-arsenic ore, it is possible to use stage flotation, ore and slime sorting, and flotation in soda medium.
Pyrite and arsenopyrite available lime or the application of air oxidation method, and soft and high potassium manganese ore Meng suppressing separation of arsenopyrite. However, it must be noted that the amount of oxidant should not be too much, and the contact time of the oxidant with the slurry should not be too long, otherwise the arsenopyrite will be activated. The gold-arsenic-pyrite concentrate of a gold-selecting plant in China contains 180.74g/t of gold and 8.3% of arsenic. The plant used potassium permanganate to test the inhibition of arsenic pyrite. The test conditions were as follows: the pulp concentration was 15%, the potassium permanganate dosage was 100g/t (original ore), and the contact time of the agent with the slurry was 5 min. The gold-pyrite was floated with butyl xanthate (80 g/t). The test results are as follows: gold-pyrite ore contains 328.05g/t of gold, 1.74% of arsenic, and the gold recovery rate is 93.43%; while arsenic concentrate contains 24.15g/t of gold and 15.26% of arsenic. The recovery rate of arsenic is arsenic. 89.22%.
For partial oxidation of gold-arsenic ore, gold and arsenic, the following processes are available:
The sulphur-like collector is used to float gold and sulfide, and the scorodite can be floated with a fatty acid collector, the concentrate is calcined and calcined cyanide; the flotation tailings are treated with NaOH solution for leaching Arsenic and removing the film on the surface of the gold particles; the residue is cyanated; and arsenic is precipitated from the alkaline solution with lime or a high concentration of NaOH solution.

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