Slurry feed fluidized roasting

Slurry feed fluidized boiling roasting is a new roasting technology developed in the 1940s. It was used in 1946 to treat the Welans gold mine in Canada, which is 12-15t of flotation gold concentrate. It is now widely used in more than a dozen mines and metallurgical plants in Canada, Australia, the United States, Japan and Zimbabwe. The slurry feed fluidization roasting process of Zhongyuan Smelter was officially put into operation in December 1990 using equipment and technology such as the Australian SP-65 constant volume hose pump. Output calcine leached after removal of copper and zinc cyanide.

The slurry feed fluidized roasting has a series of advantages such as less capital investment, low operating cost, less flue gas loss, and high SO 2 concentration, which is beneficial to acid production. The gold concentrate can be transported from the plant to the roasting plant. The roasting furnace feed usually uses 65% to 80% of the slurry containing solids without drying. The waste acid pulp discharged from the acid-making system can also be used for roasting, thereby improving the water solubility of impurities such as copper in the calcine and removing it by leaching, thereby reducing the consumption of the cyanidation agent and increasing the rate of gold.

According to the estimates of the Central Plains Smelter, the use of slurry feeds can save more than 300,000 yuan in infrastructure investment and 70kg in gold every year. Since the production was put into use, although the composition of raw materials entering the plant has changed greatly and the design requirements cannot be met, the production can still proceed normally and the expected effect is achieved.

Table 1 shows the production technical indicators of some slurry feed fluidized boiling roasting mines and smelters at home and abroad.

Table 1 Main technical indicators of slurry feed fluidized boiling roasting

Factory name

Production scale

Concentrate containing gold

Concentrate containing sulfur

Slurry concentration

Number of roasting sections

Calcination temperature

Hearth

∕t·d - 1

∕g·t - 1

∕%

∕%

Stage

∕°C

Diameter ∕m

Area ∕m 2

Zhongyuan Smelter (middle)

250

98

26.05

65～72

1

630

7.1

40

Wellens (plus)

12-15

200

80

1

640~650

Campbell Lake (plus)

72

230

78～80

2

560～590

650~760

Dickenson (plus)

75

76

80

1

700

Kalgoli (Australia)

140

100～160

32~34

65~70

1

650

5.8

26.4

North Kalgoorlie (Australia)

75

50

37

65~70

1

650

4.25

14.19

Mixed Dala (Australia)

80

40

70-75

2

650

3.1

7.53

Clolo (US)

30~35

310

78～80

1

620

Zarni (Jin)

600

120～150

71～78

2

480～550

580~650

Kosaka (Japan)

36.6

70

6.1

29.2

Okayama (Japan)

70

6.18

90

(Continued Table 1)

Factory name

Furnace production capacity

Boiling layer height

Number of spray guns

Sneeze diameter

Spray gun capability

Squirt speed

∕t·h - 1

∕mm

One

∕mm

∕m 3 ·h - 1

∕t·h - 1

∕m·s

Zhongyuan Smelter (middle)

10.4

1450

3

32

0.87

1.73

0.3

Wellens (plus)

1525

Campbell Lake (plus)

1625

Dickenson (plus)

1270

Kalgoli (Australia)

5.5~11

1500

4

25

0.95~1.96

1.38~2.75

0.74~1.11

North Kalgoorlie (Australia)

2.7 to 3.3

2

25

0.95~1.2

1.35~1.65

0.54~0.68

Mixed Dala (Australia)

3.3

1200

3

25

0.79

1.65

0.45

Clolo (US)

Zarni (Jin)

Kosaka (Japan)

1.4 to 5.5

1700

1 to 2

38

1.0 to 1.96

1.4 to 2.75

0.31～0.43

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