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Preparation method of special low-density grinding ball for cement grinding mill

A low-density, grinding ball technology, applied in the field of preparation of special low-density grinding balls for cement mills, can solve the problems of excessive heat of evaporation, high price, consumption, etc., and achieve the effects of simple operation, low price and excellent performance.

Inactive Publication Date: 2015-05-27
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent with the application number of 200510024330.5 relates to a low-temperature sintering method of nanocrystalline alumina ceramic base. Although it reduces the energy consumption of firing, it needs to add expensive nanocrystalline alumina
The Chinese invention patent with the application number 200810021162.8 proposes: Finely control the raw materials and sintering process to achieve the effect of whisker reinforcement and improve performance, but consumes too much heat of evaporation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1.1 Weigh 250 kilograms of bauxite, 80 kilograms of alumina powder, 3 kilograms of chromium oxide, zirconia, calcium oxide, magnesium oxide, and 1 kilogram of iron oxide to make raw materials;

[0031] 1.2 Add 3 kg of aluminum sol and 3 kg of silica sol to the slurry configured in Example 1.1 after grinding for 5 hours, and add aluminum chloride, magnesium chloride, zirconium chloride, calcium chloride, and barium chloride after grinding for 5 hours. 0.2 kg, add 1 kg of sodium hydroxide after grinding for 3 hours, and finally grind for 3 hours;

[0032] 1.3 The slurry obtained in Example 1.2 is spray-dried, then machine-pressed, at 35MPa / m 2 The pressure was maintained for 2 minutes, and the green body diameter was 20mm;

[0033] 1.4 Dry the sample obtained in Example 1.3 and put it into a temperature-programmed furnace for calcination. In the first stage, the temperature is raised from room temperature to 800°C at a heating rate of 8°C / min, and in the second stage, th...

Embodiment 2

[0035] 1.1 Weigh 80 kg of bauxite, 250 kg of alumina powder, 1 kg each of zirconia, calcium oxide, and magnesium oxide to make raw materials;

[0036] 1.2 Add 1 kg of aluminum sol and 1 kg of silica sol to the slurry configured in Example 1.1 after grinding for 4 hours, add aluminum chloride, magnesium chloride, zirconium chloride, each 0.3 kg after grinding for 5 hours, and grind for 2 hours Add 1 kilogram of sodium hydroxide precipitating agent later, carry out grinding for 3 hours again at last;

[0037] 1.3 The slurry obtained in Example 1.2 is spray-dried, then machine-pressed, and the machine-pressed abrasive is 80MPa / m 2 The pressure was maintained for 3.0 minutes, and the green body diameter was 50mm;

[0038] 1.4 After drying the sample obtained in Example 1.3, put it into a programmable temperature-controlled furnace for segmental calcination. In the first stage, the temperature is raised from room temperature to 900°C at a heating rate of 8°C / min. In the second sta...

Embodiment 3

[0040] 1.1 Weigh 115 kg of bauxite, 115 kg of alumina powder, 2 kg of chromium oxide, 1 kg each of zirconia, calcium oxide, magnesium oxide, and iron oxide to make raw materials;

[0041] 1.2 After grinding the slurry prepared in Example 1.1 for 5 hours, add 2 kg of aluminum sol and 2 kg of silica sol, and then add aluminum chloride, magnesium chloride, zirconium chloride, calcium chloride, and barium chloride after grinding for 4 hours. 0.13 kg, add 1.5 kg of calcium hydroxide after grinding for 3 hours, and finally grind for 3 hours;

[0042] 1.3 The slurry obtained in Example 1.2 is spray-dried, then machine-pressed, and the machine-pressed abrasive is 70MPa / m 2 The pressure was held for 2.5 minutes, and the green body diameter was 40mm;

[0043] 1.4 After drying the sample obtained in Example 1.3, put it into a programmable temperature-controlled furnace for segmental calcination. In the first stage, the temperature is raised from room temperature to 900°C at a heating ra...

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Abstract

The invention relates to a preparation method of a special low-density grinding ball for a cement grinding mill. The preparation method comprises the steps of with bauxite, alumina powder and the like as main raw materials and chromium oxide, zirconium oxide, calcium oxide, magnesium oxide, ferric oxide, manganese oxide, titanium oxide, silicon dioxide and the like as modified raw materials, adding alumina sol, silica sol and metal salt into slurry at a grinding stage; molding by rolling, isostatic pressing or machine pressing to obtain a green body; and calcining after drying the green body to obtain the low-density grinding ball. By virtue of scientific proportion design, strict process control and unique calcining system, the special low-density grinding ball disclosed by the invention is low in cost, excellent in wear resistance, lower in power load as comparison with a high-density metal grinding body, suitable for substituting a metal grinding body in cement grinding, iron ore grinding and gold ore grinding and capable of reducing the electric consumption for grinding by 30-50%.

Description

technical field [0001] The invention relates to a method for preparing low-density grinding balls for cement mills, and belongs to the technical field of functional ceramic preparation. Background technique [0002] At present, the grinding body used in the cement ball mill is mainly made of metal iron, and the alloy grinding body made of a small amount of chromium, manganese and other metals has a large volume density, which can reach 7.5 g / cm 3 , The power load required by the mill is large, and the power consumption is large; the grinding body has poor abrasiveness, large wear and high cost. [0003] The alumina grinding body is a brittle material, so as the grinding medium, the wear caused by the fracture mechanism is the main one, which is mainly manifested as shedding along the grain boundary and transgranular shedding. The actual wear process is a complex multi-factor comprehensive process. The wear resistance of alumina ceramic materials is closely related to the m...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B35/64
Inventor 张德成侯宪钦张飞飞张伟儒徐晓磊朱楠楠
Owner UNIV OF JINAN
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