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Address: No.2-A-609, NO.1 Longyu Road, Jianxi District, Luoyang, Henan, China
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Ball Mill Castings And Forgings DIA 40-60 MM Forged Steel Balls
1. Ball mill steel balls castings and forgings product parameters
(1) wear-resistant forged steel balls
| SIZES | SURFACE | CORE |
| DIA 40-60 MM | HRC60-64 | HRC59-63 |
| DIA 70-80 MM | HRC60-64 | HRC58-62 |
| DIA 90-100 MM | HRC60-64 | HRC57-61 |
| DIA 110-140 MM | HRC55-60 | HRC52-58 |
| C | Si | Mn | P | S | Cr |
| 0.72-0.82 | 0.17-0.37 | 0.7-0.8 | 0.035 MAX | 0.035MAX | 0.28-0.60 |
(2) New material wear-resistant forged steel balls
SIXZES: DIA 40 – 150MM
HARDNESS: HRC55-65
| C | Si | Mn | P | S | Cr | V |
| 0.7-0.9 | 0.45-0.75 | 0.7-1.25 | 0.04MAX | 0.04MAX | 0.11-0.4 | 0.05-0.12 |
(3) Castings and forgings steel balls product parameters
| Composition(%) | C | Si | Mn | Cr | P | S | Hardness(HRC) | Wear Rate in Gold Mine |
| Low Cr Cast Balls | 2.0~3.0 | 0.5~1.5 | ≤0.50 | 1.5~2.5 | ≤0.07 | ≤0.07 | 46~55 | About 1000g/MT |
| Mid Cr Cast Balls | 2.0~3.5 | ≤1.0 | 0.3~1.2 | 4.0~6.0 | ≤1.0 | ≤1.0 | ≥50 | About 870g/MT |
| Cr12 Cast Balls | 2.0~3.0 | ≤1.2 | 0.7~2.0 | 10~12 | ≤0.06 | ≤0.06 | ≥55 | ≤870g/MT |
| Cr15 Cast Balls | 2.0~3.0 | ≤1.2 | 0.7~2.0 | 14~16 | ≤0.06 | ≤0.06 | ≥58 | |
| Cr20 Cast Balls | 2.0~3.5 | ≤1.0 | 0.5~1.5 | 17~23 | ≤0.06 | ≤0.06 | ≥60 | ≤760g/MT |
2. Ball mill steel ball castings and forgings requirements
The output of ball mill is not only affected by the load of steel ball, but also related to the diameter of steel ball. It is required to have a certain ball diameter and maintain a certain proportion of the ball with different ball diameters. The size range of the ball diameter in the general cylinder is 25-60mm. If the cylinder body is a large diameter ball, its impact force is larger, favorable for crushing large coal, but because of the large gap between the ball and the ball, the relative surface area is small, the extrusion and grinding effect is weakened, the output of the coal mill and coal fineness are unfavorable. Too many small diameter steel balls in the cylinder body and small impact force will reduce the output of the coal mill. At the same time, due to the relatively increased surface area of the steel balls, the wear of the steel balls will increase, and the power consumption of coal grinding will increase accordingly.
For example, in the running process of the coal mill, due to wear, the weight and diameter of the steel ball are constantly decreasing, so it is necessary to regularly add new balls, in order to maintain a certain steel ball loading capacity. Generally, large diameter balls are added, and the amount of balls should be determined according to the wear rate of steel balls (wear amount of steel balls per ton of coal mill) and the amount of coal mill. After running for a certain time, the number of small diameter steel balls in the cylinder increases. Therefore, after running for about 3000 hours, it is necessary to stop the machine to clean the steel balls, so as to remove the balls with a diameter less than 15mm and the broken balls, and make up the new balls at the same time.
3. Use method of steel ball in ball mill(castings and forgings)
The newly installed ball mill has a running process, in the running process, the steel ball amount added for the first time, accounted for the ball mill maximum loading amount of 80%, the proportion of steel ball added according to the size of the ball (φ 120 mm, φ 100 mm, φ 80 mm, φ 60 mm, φ 40 mm) size added. Different types of ball mills have different amounts of ball. For example, the maximum ball loading capacity of MQG1500×3000 ball mill is 9.5-10 tons. The first time to add steel ball ball (120㎜ and 100㎜) accounted for 30%-40%, in the ball 80㎜ accounted for 40%-30%, ball (60 and 40㎜) accounted for 30%.
Why ball mill ball in the process of ball mill in quantity only to add 80%, because after installation of ball mill, ball mill need mesh size, capacity are to be gradually increased, with ball mill is normal running in two or three days in a row, pick up to check the size of the gear meshing situation, everything is all right, open the add the remaining 20% steel ball mill manhole covers the second.
Note: the addition of small steel balls is only used for the first time. Because, when the ball mill is in normal operation, the reasonable friction between the steel ball and the steel ball, the steel ball and the ore, the steel ball and the ball mill lining plate will increase the abrasion, so that the large ball mill small, medium ball mill for small ball. So normally, you don't need to add more balls. Adding small balls is in the useful mineral particle size without monomer separation, when the fineness of the mill can not meet the flotation requirements, you can add appropriate amount of small balls. The steel ball in the ball mill is constantly wearing in the process of operation. In order to maintain the reasonable ratio of ball load filling rate and ball, and maintain the stable operation of the ball mill, it is necessary to carry out reasonable ball filling and low compensation wear.
The weight of the steel ball is added according to the quality of the steel ball and the quality of the steel ball, which determines the amount of ore consumption. It is best to use the new wear-resistant steel ball, such as the steel ball forged from the train wheel hub by special treatment is especially wear-resistant.
