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Method for preventing lining plate of ball grinder from cracking

A ball mill liner and ball mill technology, applied in the direction of furnace types, furnaces, heat treatment furnaces, etc., can solve the problems of equipment management and production organization, affect the operation rate and efficiency of the ball mill, and break the grid liner of the ball mill, etc., to improve the operating time The effect of processing capacity, reducing downtime, and improving utilization factor

Inactive Publication Date: 2010-01-13
TAIYUAN IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is often encountered in production that the liner of the ball mill breaks, especially the grid liner of the ball mill breaks more frequently, which has seriously affected the operation rate and efficiency of the ball mill, and brought great difficulties to equipment management and production organization.

Method used

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Embodiment Construction

[0016] Because the high manganese steel lining board has poor thermal conductivity and large thermal expansion coefficient, it is easy to generate thermal stress and structural stress. Therefore, for the lining board with simple shape, thin and uniform thickness, and no accumulation in the furnace, it can be directly quenched by medium and high speed; and For liners with complex shapes, large and heavy pieces, great disparity in thickness, and stacked furnaces, preheating and uniform temperature should be carried out at 650-680 °C above the temperature AC1 at which austenite begins to form when the lining plate is heated. Studies have shown that the longer the holding time above AC1, the more brittle phases are dissolved, which can not only reduce the occurrence of casting cracks, but also reduce the brittle phases, reduce the temperature difference between the inside and outside, and reduce the thermal stress and structural stress, thereby reducing the Casting crack tends to i...

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PUM

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Abstract

The invention relates to a method for preventing a lining plate of a ball grinder from cracking, which is suitable for improving the lining plate of the prior ball grinder and aims to enhance the yield limit of the lining plate of the ball grinder. The method adopts high manganese steel materials, such as ZGMn13Cr2Mo and ZG32Mn9SiCr2MoRe or ZGMn9Cr2ReSi, containing metallic elements, i.e. Cr, Mo, and the like to manufacture an end lining plate, a cylinder body lining plate and a grid lining plate of the ball grinder by a lost foam casting method and needs to carry out heat processing for cast and formed lining plates before the lining plates are installed to be used. The method comprises the following steps: firstly, placing the lining plates into a furnace to be heated to 200 DEG C-300 DEG C, and preserving the temperature of the lining plates for 1-2 hours; then heating the lining plates to 650 DEG C-680 DEG C according to the speed of 40 DEG C-50 DEG C / hour, and preserving the temperature of the lining plates for 4.5-5 hours; then heating the lining plates to 1060 DEG C-1090 DEG C according to the speed of 60 DEG C-70 DEG C / hour, and preserving the temperature of the lining plates for 3.0-4.0 hours; taking the lining plates out of the furnace, placing the lining plates into water to subject to water toughening processing, then placing the lining places into a tempering furnace to be heated to 300 DEG C-350 DEG C according to the speed of 40 DEG C-50 DEG C / hour, and preserving the temperature of the lining plates for 6-8 hours; then cooling the lining plates at the speed of 1.5-2.5 min / mm; tempering the lining plates into the furnace, and controlling the temperature of the lining plates below 150 DEG C.

Description

technical field [0001] The invention relates to a method for preventing the liner of a ball mill from breaking. Background technique [0002] The ball mill is the main equipment for the production of iron ore powder. The ball mill performs coarse grinding, medium grinding and fine grinding of iron ore to make the particle size of iron ore powder meet the user's requirements. However, it is often encountered in production that the liner of the ball mill breaks, especially the grid liner of the ball mill breaks frequently, which has seriously affected the operation rate and efficiency of the ball mill, and brought great difficulties to equipment management and production organization. Contents of the invention [0003] The object of the present invention is to overcome the above-mentioned deficiencies in the prior art and provide a method for preventing the liner of a ball mill from breaking which can increase the yield limit of the liner of the ball mill. [0004] The ball...

Claims

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Application Information

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IPC IPC(8): B22C9/04C21D9/00C21D1/18C21D11/00
Inventor 何铁牛李鹏强郝步高
Owner TAIYUAN IRON & STEEL GROUP
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