Cement Raw Mill/Ball Mill

Processing of gold ore/ball mill with ISO/CE 

(processing gold ore)The ball mill is a key piece of equipment for grinding crushed materials, and it is widely used in production lines for powders such as cement, silicates, refractory material, fertilizer, glass ceramics, etc. as well as for ore dressing of both ferrous non-ferrous metals. The ball mill can grind various ores and other materials either wet or dry. There are two kinds of ball mill, grate type and overfall type due to different ways of discharging material. There are many types of grinding media suitable for use in a ball mill, each material having its own specific properties and advantages. Key properties of grinding media are size, density, hardness, and composition.

 (processing of gold ore)Wet ball mill is the key equipment for grinding after the crushing process, which is widely used in mining and processing industry and other manufacturing industries, such as cement, silicate, new building materials, etc.

And the ore dressing of both ferrous and non-ferrous metals. The ball mill can grind various ores and other materials either wet or dry.( processsing of gold ore )And then there are two types of ball mill, one for the wet material, another is used for drying. Wet ball mill is mainly used for dressing.

Structural Feature of Ball Mill: 

(processing of gold ore)The Ball mill is a principle and cylindrical revolving device, and belongs to external gear-driving ball mill. The materials are transported by feeder, and gets into mill chamber through hollow screw axis equably, and there is lining plate and steel balls in the chamber. When the cylinder body goes round and round, the steel ball is taken to certain height, then falls down, and the materials are struck and grinded heavily. The above action repeats constantly till the size of materials reaches the required fineness. The powdery materials are discharged through discharge grate plate, and the milling work is over.

(processsing of gold ore)The Ball mill mainly consists of feeding part, discharging part, gyre part, transmission part (decelerated machine, small transmission gear, motor, electric control) and so on. The hollow axis adopts cast steel, the lining plate can be replaced, the big gyre gear is made of forging rolling gear, and there is lining plate in the cylinder body, which has favorable abrasion resistance. The ball mill has the features of stable running and reliable working.

Wet Grinding Ball mill Features:

 1,Wet grinding ball mill adopts groove-type circular lining plate that is instrumental in increasing contact areas of iron balls and ores, which enhances grinding action and ore lifting capacity and decreases energy consumption.

2, (processing of gold ore)The transmission machinery of the ball mill substitutes large-scale double row self-aligning roller bearing for sliding bearing. It is easy to start and saves energy up to 20-30%

3, Wet grinding ball mill adopts whole milling house, which makes it easy for construction and installation.

4, Wet grinding ball mill is equipped with oil-mist lubrication device which guarantees smooth operation of gears

5, Wet grinding ball mill has bigger discharge opening and huge processing capacity.

 (processing of gold ore) The Ball mill working principle:

 This machine is a skeleton pattern ball mill with horizontal cylindrical turning gear, drive by outer gear and two hoppers. The material goes to the first hopper after the spiraling by the quill shaft from the feeding equipment. The hopper has ladder sheathing or corrugated sheathing with steel balls inside, which will fall under the effect of centrifugal force by barrel turning to ram hard and grind material. After the kibbling in the first hopper, by monolayer partition panel, the material will enter the second hopper, which has plane scale board with steel ball inside to grind material. The powder material will be discharged from the grid plate to finish the grinding.

(processing of gold ore) selection shall meet the following requirements:

1, the rod mill more than used for coarse grinding, grinding particle size is 1 ~ 3 mm more, heavy mill plant for 0.5 mm. Fairly granular, a significant reduction in the grinding efficiency. Due to the influence of grinding rod movement in mill, rod mill diameter should not be commonly more than 4500 mm in diameter, grinding rods should not be greater than 6000 mm in length. When rod mill and ball mill, rod mill and ball mill ratio should be 1:2.

2, grate ball mill used for coarse grinding, more commonly used in single-stage grinding grinding in the first paragraph or two paragraphs grinding. Working closed-circuit grinding fineness is commonly 50% ~ 70% to 0.074 mm. Grinding machine with spiral classifier.

3, the overflow type ball mill can be used in a grinding,(processing of gold ore) grinding or intermediate products can also be used in the second paragraph of the mill again. At present many domestic or intermediate used in the second paragraph product grinding operation again, generally with the hydrocyclone classification equipment. Grinding machine for the first period of grinding, sometimes with spiral classifier. Large-scale ball mill (generally greater than 4000 mm in diameter), with the overflow type ball mill grinding circuit with hydrocyclone composition, both simplifies mill structure, double for easy maintenance.

(processing of gold ore)Ball mill main technical parameters:

Model

Speed of bucket
(r/min)

Weight
of ball

Size of
feed opening(mm)

size of outputting
feed (mm)

Production
(t/h)

Power
(kw)

Weight
(T)

900×1800

38

1.5

≤20

0.075-0.89

0.65-2

18.5

3.6

900×3000

38

2.7

≤20

0.075-0.89

1.1-3.5

22

4.6

1200×2400

32

3.8

≤25

0.075-0.6

1.5-4.8

45

12.5

1200×3000

32

5

≤25

0.075-0.4

1.6-5

45

12.8

1200×4500

32

7

≤25

0.075-0.4

1.6-5.8

55

13.8

1500×3000

27

8

≤25

0.075-0.4

2-5

90

17

1500×4500

27

14

≤25

0.075-0.4

3-6

110

21

1500×5700

27

15

≤25

0.075-0.4

3.5-6

132

24.7

1830×3000

24

11

≤25

0.075-0.4

4-10

180

28

1830×6400

24

23

≤25

0.075-0.4

6.5-15

210

34

1830×7000

24

25

≤25

0.075-0.4

7.5-17

245

36

2200×5500

21

30

≤25

0.075-0.4

10-22

370

48.5

2200×6500

21

30

≤25

0.075-0.4

14-26

280

52.8

2200×7500

21

33

≤25

0.075-0.4

16-29

475

56