Re-election of manganese ore (2)

Eighty-one manganese ore beneficiation plant process to be used to process the job shaker after reduction roasting products, selected particle size less than 2mm, the choice of 6-S type shaker 1800mmx4500mm shaker for coarse, fine sand shaker, shake with spring Bed treatment of slime, mineral processing indicators are shown in Table 11.

Table 11   Bayer manganese ore dressing plant roasting magnetic separation products with shaker sorting effect

project

Coarse sand shaker

Fine sand shaker

Slime shaker

name

concentration/%

Yield/%

Manganese grade /%

Recovery rate/%

concentration/%

Yield/%

Manganese grade /%

Recovery rate/%

concentration/%

Yield/%

Manganese grade /%

Recovery rate/%

Feed mine

7.54

100

18.65

100

3.9

100

17.3

100

3.07

100

16.5

100

Concentrate

 

12.21

41.25

27.03

 

8.62

39

19.29

 

4.1

41.95

10.41

Middle mine

 

18.79

21.8

21.94

 

14.15

26.2

21.59

 

4.7

23.6

6.43

Tailings

 

69

13.8

51.03

 

77.23

13.25

59.12

 

91.2

15.1

83.16

3. Heavy medium ore dressing Heavy medium dressing, also known as suspension ore dressing, is a process in which the separation of the useful minerals and gangues is carried out in suspension. Practice has proved that heavy medium beneficiation has high separation precision, large selection of particle size range, high efficiency in discarding waste rock in pre-selection, and no sewage discharge during sorting. It was widely used in non-ferrous metals, ferrous metals and roughing operations in the coal industry. The heavy medium manganese industry has mature experience abroad. Australia's Groot Island manganese mine, India's Dongli-Buze mine, Japan's Shangguo manganese ore beneficiation plant, Brazil's Ekomi manganese mine company Santara plant and the New Mexico manganese ore plant have been in industrial production. Application, the effect is good. China has also done a lot of useful work in the research and application of manganese in heavy media, and has gained certain experience.
Kunming Institute of Metallurgy and Xiangtan Manganese Mine have done a lot of work in the experimental study of manganese selection in heavy media. From the mid-1970s, large-scale small tests, pilot tests, and industrial trial production began. On selection medium, a trial has manganese particles, scrap cast iron, magnetite concentrate the like, from the viewpoint of the cost of media, and a medium recovery medium degree of difficulty of manganese products equiangularly impact, ultimately the choice of magnet Daye Mineral concentrate is used as medium, which has the advantages of suitable density, not easy to oxidize and mud, not corroding the pipeline, cheap price, convenient source, simple recovery and purification. The main properties of magnetite: containing 62.5% Fe, density 4.6g/cm 3 , and particle size 0.074mm accounted for 55%.
The heavy medium cyclone is a sorting device that separates useful minerals and gangues in the ore using heavy media in a centrifugal field. Its sorting is mainly determined by the density of useful ores and is less affected by particle size and shape. Because the ore and the medium are simultaneously subjected to centrifugal force in the cyclone. Therefore, it can be used for ores with lower media density and higher separation density requirements.
The ore and the appropriate proportion of the resuspension are formulated into a certain concentration of slurry flow, which is fed into the cylindrical part of the cyclone in a tangential direction by the feeding port at a certain pressure, and the ore is rotated radially with the medium in the cyclone, due to The buoyancy of the centrifugal force and the large medium density resuspension creates a high-density sorting zone inside the cyclone, and the ore is layered according to the density. The medium is graded and concentrated in the sorting zone, forming a density wall in the radial direction, and the density gradient is successively decreased from the outer and the inner. The selected ore is brought to the wall with the medium, and the ore with a high density is thrown to the wall through the dielectric layer, and descends with the wall of the high-density medium, and the spiral motion at the bottom of the cone is discharged by the grit chamber. The ore with a small density is located in the high-density sorting zone. Due to the inertia and the buoyancy of the suspension and the cross-sectional area of ​​the cone portion, the column is raised with the air column, and moves toward the center of the cyclone. The tube is discharged to achieve the purpose of sorting the ore.

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The process flow of Xiangtan Manganese Mine Industrial Trial Production is shown in Figure 1. The 500mm double cone cyclone is selected and the selection conditions are as follows:
Grit chamber: 60mm overflow tube: 140mm
Lower cone angle: 5° Upper cone angle: 23°
Installation angle: 10° Pressure difference: 6.5m
Medium density: 2.30g/cm 3
See Table 12 for the pre-mineral indicators measured during the trial production period.

Table 12   Heavy medium ore dressing trial production ore dressing index

Product Name Indicator Project

Yield/%

Manganese grade /%

Manganese recovery rate /%

Rough concentrate increase

Coarse concentrate

84.6

24.52

91.02

1.73

Tailings

15.4

13.3

8.98

Raw ore

100

22.79

100

The faucet manganese ore has also been tested in the heavy medium cyclone industry. The fixed technical parameters of the cyclone are:
Heavy medium cyclone cylinder diameter: Ñ„350mm
Cylinder length: 350mm
Overflow pipe diameter: Ñ„125mm
Sanding mouth diameter: Ñ„55mm
Cone angle: 50°
Column height: 6.5m
Inclusion medium density: 2.15~2.40g/cm 3
Test feed size: 20~4mm
The Daye iron concentrate powder was used as the medium, with iron content of 61.4%, density of 4.5g/cm 3 and particle size of -0.074mm accounting for 60%.
The test results are shown in Table 13.

Table 13 Industrial test indicators for faucet manganese ore heavy medium cyclone

Mineral sample

Raw ore manganese content /%

Concentrate

Raw ore manganese content /%

Increase rate /%

Yield/%

Manganese grade /%

Recovery rate/%

No. 1 Mine

17.08

71.1

21.4

89.08

6.45

4.32

No. 2 Mine

13.5

45.35

18.2

61.14

9.6

4.7

No. 3 Mine

14.3

50.51

20.67

73.01

7.8

6.37

Wafang Manganese Mine was also built in 1974. It is a re-election plant that processes 820,000 tons of raw ore. It is a vibrating trough of 60~10mm into the weight medium after the manganese ore is sorted by the heavy medium vibrating trough and the trapezoidal jig. From September 1974 to November 1979, a total of 2108h was operated, 40588t of raw ore was processed, 79500t of concentrate was obtained, the ore grade was 11.24%~14.96%, the manganese grade of concentrate was 22.48%~25.07%, and the manganese in tailings was 8.11%~10.10%, the recovery rate of manganese metal is 41.33%~47.27%, which is 9.84% manganese in the original design, 26% manganese in concentrate, 5.5% manganese in tailings, and 55.94% metal recovery. Analysis of the reasons: 1 mine, rock density difference is small; 2 optional test ore sample and the actual production of mineral raw materials inconsistent; 3 media raw material selection is improper; 425 ~ 10mm grain size sorting effect is poor, after repeated rectification invalid And stopped production.

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