January 28, 2022

Examples of cyanidation of gold-bearing iron ore concentrates and calcines

The following table is a comparison process cyanide ore treatment and Shandong and Hebei five gold containing pyrite ore samples. Among them, the 5 # sample is the cyanide tailings of the Jinchangyu Gold Mine, which is cyanated and leached after being calcined by the Qianxi Chemical Plant. This process was completed in 1982 at the Qianxi Chemical Plant to build a 25t∕d cyanide gold extraction industrial test plant, with a gold re-leaching rate of 77%. It can be seen from the table that under the premise of suitable grinding particle size, the 3 # -like process is better, the recovery rate is the highest, and the cyanidation treatment has less feed, and the cyanide is reduced by 1 # and 2 #. Re-grinding before leaching. The gold remaining in the cyanide leach residue was 80% tested as wrapped gold. This is because the gold in the pyrite is too fine to be recycled.

Comparison of gold iron ore concentrate and calcination cyanide leaching

Numbering

Place of origin

Process

Process

Pre-cyanide grinding ∕%-300 mesh

NaCN∕

g·t -1

CaO∕

Kg·t -1

Leaching

Time ∕h

Raw material grade∕

g·t -1

Leaching residue containing gold

g·t -1

Gold leaching rate

∕%

1

Shandong

Raw ore flotation concentrate cyanide

98.0

6.2

5.0

10

1.25

91.67

2

Shandong

Cyanide after roasting of ore flotation concentrate

53.2

3.8

5.0

10

18.50

1.33

92.81

3

Shandong

Flotation concentrate cyanide after ore roasting

Not grinding

6.0

11.65

twenty four

104.0

4.75

95.08

4

Inner Mongolia

Cyanide after roasting of raw ore

Not grinding

1.5

42.0

8

8.6

1.20

86.05

5

Hebei

Cyanide slag roasting after water quenching cyanidation

83%

-360 mesh

0.94

6.77

8.5

4.20

0.96

77.00

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