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Gold-arsenic ore dressing technology
Native gold - arsenic ore frequently contains 1% to 2% to 10% to 12% arsenic, pyrite, other sulfide minerals pyrite and pyrrhotite. When the gold in the ore is encapsulated in sulfide, the gold-arsenic concentrate or gold-arsenic-pyrite concentrate is generally selected by mixed flotation, and then the concentrate is pretreated and cyanide is recovered. .
The Romanian Dalni Gold Exchange Plant processes insoluble gold-arsenic ore with a gold content of 7.0 g/t. The plant uses a flotation-baking-cyanide joint process (Figure 1). After the ore was crushed in two stages, it was first wet-milled with a Ф13.66m×7.1m rod mill and then with a m2.4m×2.4m ball mill (closed with a hydrocyclone with a diameter of 609mm). The overflow of the hydrocyclone is subjected to two-stage flotation, and the dosage of the agent is shown in Table 1. The flotation concentrate contains gold of 90-125g/t, sulfur content of 16%-22%, arsenic content of 6%, and gold flotation recovery rate of 89%.
Figure 1 Gold-arsenic ore beneficiation process in the Romanian Dalni Gold Exchange
Table 1 Flotation agent system
Dosing location
Drug
Dosage /g·t - 1
Rod mill
Soda
Butyl xanthate and amyl xanthate
750
65
Ball mill
Copper sulfate
Butyl xanthate
Dow Rolls 250
55
30
10
Section III hydrocyclone feeding
Copper sulfate
Butyl xanthate and amyl xanthate
20
10
Section III hydrocyclone grit
Ibid.
10
Flotation to mine
Dow Rolls 250
25th black medicine
10
15
The flotation gold-arsenic concentrate is calcined in a boiling roaster, and then calcined to cyanide, and the cyanidation recovery rate of gold is 95% to 97%.