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Ball mill liner plate and manufacturing method

A ball mill liner and liner technology are applied in the wear-resistant ball mill liner and its manufacture, and in the heat-resistant field, which can solve the requirement that the high temperature working condition of the ball mill cannot be met, the production cost of the liner remains high, and restricts the ball mill liner. Development and other issues, to achieve the effect of increased cost performance, low cost and high hardness

Inactive Publication Date: 2015-07-01
ZHUMADIAN ZHONGJI HUAJUN CASTING +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the past, the influence of high temperature was not considered at the beginning of the design of the low-alloy wear-resistant material liner. In recent years, with the development of the cement industry, the ball mill has been gradually equipped with a drying chamber, which leads to an increase in the temperature inside the mill. The performance of the low-alloy wear-resistant material liner can no longer meet the requirements of the high-temperature working conditions of the ball mill
[0004] During the use of the ball mill liner, due to the influence of high temperature in the mill, its mechanical properties are gradually changed, resulting in a significant decrease in its impact toughness, resulting in cracks and fractures in the liner
In addition, in the heat-resistant and wear-resistant lining materials commonly used at present, the content of materials other than iron (non-ferrous materials) is as high as 10%-20%, which not only contains common elements such as chromium and molybdenum, but also expensive tungsten and nickel. , vanadium, titanium and other rare metal elements, expensive raw materials make the production cost of the liner high, restricting the development of the ball mill liner, so there is an urgent need for a ball mill liner that can meet the use requirements and has low cost

Method used

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  • Ball mill liner plate and manufacturing method
  • Ball mill liner plate and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] First, the raw materials are 0.4% C, 1.2% Si, 1.0% Mn, 1.0% Cr, 0.1% Mo, 0.020% S, 0.025% P, 0.0025% Re, 0.003% B, The balance is mixed with the proportion of Fe, and the mixture is smelted and cast to obtain the liner of the ball mill. Then, the liner is heated to 640°C at a rate of 1.3°C / min. The temperature of the plate is raised to 970°C for 5 hours, and then cooled with 30# engine oil as the medium, the oil outlet temperature is 100°C, and finally, the lining plate is tempered, the tempering temperature is 240°C, and the tempering holding time For 10 hours, after natural cooling in air, carry out secondary tempering, the temperature and time of secondary tempering are the same as the first time, after the above steps are completed, the metallographic structure is lower bainite and tempered martensite liner, specifically figure 2 shown.

[0039] Test the obtained liner, its hardness is 55HRC, impact toughness is 120J / cm 2 .

Embodiment 2

[0041] First of all, the raw materials are 0.38% C, 0.73% Si, 0.88% Mn, 0.85% Cr, 0.12% Mo, 0.016% S, 0.024% P, 0.0024% Re, 0.0025% B, The balance is mixed with the proportion of Fe, and the mixture is smelted and cast to obtain the liner of the ball mill. Then, the temperature of the liner is raised to 650°C, and after 0.5 hours of heat preservation, the temperature of the liner is raised to 960°C at a rate of 3°C / min. 4 hours, then, use 30# engine oil as the medium to cool, the oil outlet temperature is 100°C, and finally, temper the liner, the tempering temperature is 250°C, the tempering holding time is 8 hours, in the air After natural cooling, perform secondary tempering, the temperature and time of the secondary tempering are the same as the first time, after the above steps are completed, the metallographic structure of the lining plate is lower bainite and tempered martensite, specifically as follows image 3 shown.

[0042] Test the obtained liner, its hardness is 5...

Embodiment 3

[0044] First of all, the raw materials are 0.39% C, 0.84% ​​Si, 0.98% Mn, 0.95% Cr, 0.12% Mo, 0.011% S, 0.018% P, 0.0025% Re, 0.0025% B, The balance is mixed with the proportion of Fe, and the mixture is smelted and cast to obtain the liner of the ball mill. Then, the temperature of the liner is raised to 650°C, and after 1 hour of heat preservation, the temperature of the liner is raised to 980°C at a rate of 3°C / min. 6 hours, then, use 30# engine oil as the medium for cooling, the oil outlet temperature is 100°C, and finally, temper the lining plate, the tempering temperature is 240°C, the tempering holding time is 10 hours, After natural cooling, perform secondary tempering, the temperature and time of the secondary tempering are the same as the first time, after the above steps are completed, the metallographic structure of the lining plate is lower bainite and tempered martensite, specifically as follows Figure 4 shown.

[0045] Test the obtained liner, its hardness is ...

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Abstract

The invention provides a ball mill liner plate. The bowl mill liner plate comprises, by weight, 0.31-0.43% of C, 0.5-1.2% of Si, 0.8-1.2% of Mn, 0.5-1.5% of Cr, 0.1-0.2% of Mo, less than or equal to 0.035% of S, less than or equal to 0.035% of P, 0.0015-0.0035% of Re, 0.0015-0.0035% of B and the balance Fe. The invention also provides a manufacturing method of the ball mill liner plate. The bowl mill liner plate has high hardness, uniform section hardness, high toughness, good heat resistance and good wear resistance, does not produce cracks and fracture in use, has a prolonged service life and substantially improves casting cost performances.

Description

technical field [0001] The invention relates to a ball mill liner and a manufacturing method thereof, in particular to a heat-resistant and wear-resistant ball mill liner and a manufacturing method thereof. Background technique [0002] The ball mill is the key equipment for crushing the material after it is crushed. It is widely used in cement, silicate products, new building materials, refractory materials, fertilizers, ferrous and non-ferrous metal beneficiation and glass ceramics and other production industries. The liner of the ball mill is used to protect the cylinder from the direct impact and friction of the grinding body and the material. At the same time, different forms of liner can be used to adjust the movement state of the grinding body to enhance the grinding body's impact on the material. The crushing effect helps to improve the grinding efficiency of the mill, increase the output and reduce the metal consumption. The above functions make the ball mill line...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C21D1/18B02C17/22
Inventor 秦鹏鹏赖明春李建宋少磊承明泽谢文博王印全
Owner ZHUMADIAN ZHONGJI HUAJUN CASTING