Pre-selection preparation of molybdenum ore (3)

(B) the application of high chromium cast iron ball in gold molybdenum concentrator beneficiation plant genus ball high consumption, especially iron ore concentrator ball unit consumption is higher than abroad more than doubled, so the ball great consumption According to the statistics of relevant departments in China, in 1979, the domestic concentrating plant used about 240,000 tons of grinding balls in the whole year. Therefore, researching the material of grinding balls, improving and improving the performance of grinding balls and reducing the single consumption of grinding balls will start the national economy. Great energy saving effect.
The Department of Mechanical Engineering of Xi'an Jiaotong University and Jinduicheng Molybdenum Co., Ltd. jointly carried out tests on the application of high- chromium cast iron balls in molybdenum beneficiation plants, and achieved remarkable results.
High chromium cast iron is characterized by its metallographic structure: high yield strength martensitic metal matrix with discontinuous high hardness (Fe, Cr) 7C3 carbide phase, so it is especially suitable for abrasive wear. High chromium cast iron flat plate in a coal grinding mill liner as the roll sleeve and has been quite successful, its life was 3 to 4 times the original high-manganese steel and 9 to 10 times. Used as a lining in cement mills, the wear is also greatly reduced. It shows that high cast iron has a broad prospect in the case of abrasive wear, but what is the effect of high chromium cast iron under wet grinding conditions? No domestic data reported in Japan recently reported high-chrome cast iron wet grinding of copper ore wear rate of 0.4997 g / hour, we can see, although wet grinding to reduce abrasion resistance, but the high chromium cast iron wear rate is still much lower.
1. Chemical composition casting process of high chromium cast iron balls The chemical composition of high cast iron balls is shown in the table.

High chromium cast iron grinding ball chemical composition

Chemical   learn    to make    Share ( % )

Hardness Rc

Microstructure

C

Si

Mn

S

P

Cr

Mo

Cu

Fe

2.4~2.5

≤ 1.0

≤ 0.8

≤ 0.04

≤ 0.04

15~16

1.0~1.2

0.8~1.0

margin

≥ 60

Martensite + eutectic carbide twelve-time carbide

The casting process of the grinding ball is made by wet sand casting, and the atmospheric pressure side feeder is fed. The temperature of the tapping is 1450~1470°C, and 0.8% of the rare earth is added to the bag, and the pouring temperature is 1350~1360°C. Grinding ball heat treatment is kept at 980 ° C for two hours after the furnace temperature. Immediately after the furnace is released, the grinding ball is spread on the ground, air-cooled, and the surface hardness of the grinding ball is checked, generally Rc ≥ 60.
Jinduicheng Molybdenum Co., Ltd. originally used medium carbon steel balls produced by Handan Iron and Steel Co., Ltd. The surface hardness of steel balls is Rc52~56, and the hardness of core is Rc34~36.
2. The molybdenum ore mineral composition andesite type metal ore, granite porphyry see small object molybdenite minerals, mineral and non-current quartz, potassium feldspar, plagioclase were interspersed with other symbiotic relationship, and its hardness In terms of minerals, the highest hardness quartz is 30.5%, and the composition of molybdenum ore is shown in the table below.

Molybdenum ore mineral phase composition

Mineral phase

Black mica

  Yunying

Plagioclase

Pyrite

Potash feldspar

Molybdenite

other

Mineral phase %

42.4

30.5

10.2

6.7

10.2

0.175

 

Mineral phase hardness HV

900-1200

840-1130

795

[next]

3. Test Results The consumption of forged steel balls used in Jinduicheng over the years is shown in the table below. The single-consumption measurement results and the wear rate measurement results of the high-chromium cast iron balls are shown in the next two tables.

Jinduicheng forged steel grinding ball statistics

Concentrator

Statistical period

Processing of minerals (tons)

Forged steel ball consumption (tons)

Wear kg/T

Small selection plant

1966-1982

1863025.26

3285

1.764

Selected plant

1971-1982

15587646.42

25574.5

1.641

total

 

17450671.68

28859.5

1.654

Determination of single consumption of high cast iron grinding balls

Date of measurement

Operating period (tons)

Processing of minerals (tons)

High chrome ball consumption (kg)

Grinding ball unit consumption (kg / ton)

Remarks

1982.10.16

729

7357.78

3808.77

0.5176

Sampling calculation

1982.10.28

1009.75

10290.86

5164.186

0.5018

Sampling calculation

1982.11.29

1664.92

17017.08

7371.346

0.433

Sampling calculation

1982.12.25

2195.42

22,443.32

10771.346

0.48

Sampling calculation

1983.1.26

2784.09

28,304.67

13911

0.491

Clearance

Determination of wear rate of high chromium cast iron grinding balls

Determination date and runtime (hours)

Ф100

Ф80

Ф60

Ball weight (g)

Ball weight loss (g)

Wear rate (g / hr)

Ball weight (g)

Ball weight loss (g)

Wear rate (g / hr)

Ball weight (g)

Ball weight loss (g)

Wear rate (g / hr)

82.9.11

 

4302.6

 

 

2186.38

 

 

71.2

 

 

82.10.16

729

3714

888.6

1.219

1751.6

44.78

0.596

614.75

56.45

0.352

82.11.28

280.75

3225

189

0.673

1575.63

175.99

0.627

547.9

66.85

0.238

82.11.29

655.17

2591.4

633.6

0.967

1205.4

370.23

0.565

404.5

143.4

0.219

 

530.5

2113.3

478.1

0.901

1000

205.4

0.387

316

88.5

0.167

82.9.11

588.67

1574.1

539.2

0.916

7421

257.9

0.438

200.8

115.2

0.19

83.1.26

2784.09

 

2728.5

0.98

 

1444.28

0.519

 

670.4

0.241

It can be seen from the tabular data that the use of high-chromium cast iron balls is only 0.491 kg/ton. Compared with the original consumption of 1.654 kg / ton of forged steel balls, the unit consumption is reduced by 70.3%. A high-chromium casting balloon can be used for 3.369 forged gold balls. According to the measurement, the crushing rate of the high chromium casting balloon is also very low. During the test, only three cracks were found in the ф100 mm ball, that is, the ball breaking rate was 0.67 ‰; and the ф80, ф60 mm balls were not found to have broken the ball. It can be seen that the high chromium cast balloon of the selected component has sufficient toughness to prevent the occurrence of broken ball.
According to preliminary estimates by the test unit, the use of high-chromium cast iron balls can save 8,000 tons of steel balls per year for the 10,000-tonne forged steel balls, saving the cost of steel balls by at least 1.2-1.8 million yuan.
The high-chromium cast iron ball has defects in the casting process, and has pores, shrinkage, etc., which makes the ball compact and the strength performance are reduced, and the defect is easily peeled off, and the wear is accelerated. Measures are currently being taken to improve the intrinsic quality of the ball.

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