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

A low-density, cement grinding technology, applied in the field of functional ceramics preparation, can solve the problems of high price, high evaporation heat, and consumption, and achieve the advantages of simple operation, reduced power consumption and grinding body loss, and promoted densification and sintering Effect

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 kg of bauxite, 80 kg of alumina powder, 3 kg of chromium oxide, 1 kg each of zirconia, calcium oxide, magnesium oxide, and iron oxide to make raw materials;

[0031] 1.2 Add 3 kg of aluminum sol and 3 kg of silica sol to the slurry raw material configured in Example 1.1 after grinding for 5 hours, and then add aluminum chloride, magnesium chloride, zirconium chloride, calcium chloride, and barium chloride after grinding for 5 hours 0.2 kg each, add 1 kg of sodium hydroxide after grinding for 3 hours, add 1 kg of one or more precipitants 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, and the machine-pressed abrasive is 35MPa / m 2 The pressure was kept for 2 minutes;

[0033] 1.4 Dry the sample obtained in Example 1.3 and put it into a programmable temperature-controlled furnace for segmental calcination. In the first stage, the temperature is raised from room t...

Embodiment 2

[0035] 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;

[0036] 1.2 Add 2 kg of aluminum sol and 2 kg of silica sol to the raw materials configured in Example 1.1 after grinding for 5 hours, and add aluminum chloride, magnesium chloride, zirconium chloride, calcium chloride, barium chloride each 0.13 after grinding for 5 hours kg, add 1.5 kg of calcium hydroxide after grinding for 3 hours, and finally grind for 3 hours;

[0037] 1.3 The slurry obtained in Example 1.2 is spray-dried, and then machine-pressed, and the machine-pressed abrasive is 70MPa / m 2 Keep the pressure for 2.5 minutes;

[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 stage, the heating rate i...

Embodiment 3

[0040] 1.1 Weigh 115 kg of bauxite, 115 kg of alumina powder, 1.5 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 4 kg of aluminum sol and 4 kg of silica sol, and then add aluminum chloride, magnesium chloride, zirconium chloride, calcium chloride, and barium chloride after grinding for 5 hours. 0.1 kg, add 1 catties of strong calcium oxide after grinding for 3 hours, and finally grind for 3 hours;

[0042] 1.3 The slurry obtained in Example 1.2 is spray-dried, and then machine-pressed, and the machine-pressed abrasive is 70MPa / m 2 Keep the pressure for 2.5 minutes;

[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 rate of 8°C / min. In the second sta...

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Abstract

The invention relates to a preparation method of a special low-density grinding column 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 column. By virtue of scientific proportion design, strict process control and unique calcining system, the special low-density grinding column 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 a special low-density grinding column 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 rela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/64
Inventor 张德成张伟儒侯宪钦张飞飞徐晓磊朱楠楠
Owner UNIV OF JINAN
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