Method for preparing high-pressure-resistance alumina grinding medium through roll forming

A technology of grinding media and alumina, which is applied in the field of ceramic materials, can solve the problems of complex isostatic pressing process, high product cost and low strength, and achieve the effects of convenient batch production, low production cost and low wear

Active Publication Date: 2016-09-07
山东谊星新材料有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the isostatic pressing process is complicated and the investment in equipment is high. Especially for dry grinding balls with a diameter of 13mm to 30mm, the large-scale production is severely limited, the efficiency is low, and the product cost is high.
However, the compressive strength of the grinding balls prepared by the traditional roll forming method is limited, and it cannot be applied in the field of dry grinding.
After research, the main reason for the low comp

Method used

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  • Method for preparing high-pressure-resistance alumina grinding medium through roll forming
  • Method for preparing high-pressure-resistance alumina grinding medium through roll forming
  • Method for preparing high-pressure-resistance alumina grinding medium through roll forming

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preparation example Construction

[0048] The preparation method of 1# alumina powder is: in aluminum hydroxide (water content is 2.7%), add the composite mineralizer of its quality 3‰ (the component of described composite mineralizer and its weight ratio are, boric acid: chlorine Ammonium chloride: magnesium oxide: ammonium nitrate = 1:0.5:0.3:0.3) is fired at a temperature of 1450°C in a rotary kiln. The α-phase transformation rate of the prepared 1# alumina powder accounts for 93% (the rest is γ-phase alumina), and the original grain size D90 is about 4.0 μm, which belongs to the flaky crystal structure. Aluminum powder can also be used.

[0049] The preparation method of 2# alumina powder is as follows: directly put the γ-phase alumina from a manufacturer in Shandong into a sagger and fire it in a tunnel kiln at a firing temperature of 1360°C and a holding time of 16 hours. In the prepared 2# alumina powder, the α-phase transformation rate accounts for 88% (the rest is γ-phase alumina), and the primary gra...

Embodiment 1

[0056] (1) Raw materials and parts by weight

[0057] Main ingredient 1#: 88 parts of 1# alumina powder, 10 parts of kaolin;

[0058] Excipient 1#: 0.5 part of calcium carbonate, 0.5 part of talc, 1 part of silicon micropowder;

[0059] Doping material 2#: 88 parts of 2# alumina powder, 10 parts of kaolin;

[0060] Excipient 2#: 0.5 part of nano calcium carbonate, 0.5 part of nano talc, 1 part of nano spodumene;

[0061] Additives: 1.2 parts of polyvinyl alcohol, 0.5 parts of glycerin, 0.2 parts of oleic acid, 0.2 parts of paraffin;

[0062] (2) Weigh the 1# alumina powder, kaolin and auxiliary material 1# in the main ingredient 1# respectively, and put them together into the batch ball mill for wet ball milling (use alumina ball stone as the grinding medium, material: ball: water =1:2.5:1), the first ball milling time is 35 hours, the slurry fineness D90=5.5μm, after the fineness is qualified, pass through a 180 mesh sieve and put it into the transfer slurry tank, and then...

Embodiment 2

[0071] (1) Raw materials and parts by weight

[0072] Main ingredient 1#: 89 parts of 1# alumina powder, 8 parts of kaolin;

[0073] Excipients 1#: 1.5 parts of calcium carbonate, 0.5 parts of talc, 1 part of silica powder;

[0074] Doping material 2#: 89 parts of 2# alumina powder, 9.5 parts of kaolin;

[0075] Excipient 2#: 0.5 part of nano-calcium carbonate, 0.5 part of nano-scale talc, 0.5 part of nano-spodumene;

[0076] Additives: 2.0 parts of polyvinyl alcohol, 1.2 parts of glycerin, 0.7 parts of oleic acid, 0.3 parts of paraffin;

[0077] (2) Weigh the 1# alumina powder, kaolin and auxiliary material 1# in the main ingredient 1# respectively, and put them together into the batch ball mill for wet ball milling (use alumina ball stone as the grinding medium, material: ball: water =1:2.7:1), the first ball milling time is 32 hours, the slurry fineness D90=5.2μm, after the fineness is qualified, pass through a 180 mesh sieve and put it into the transfer slurry tank, and...

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Abstract

The invention discloses a method for preparing a high-pressure-resistance alumina grinding medium through roll forming. The method is especially suitable for preparing 13 mm-30 mm dry grinding balls used in the dry grinding field. The method includes the steps that firstly, spray drying is carried out, and conventional alumina granulation powder is directly obtained and serves as granulation powder A; superfine collected dust powder collected from a dust collector in preparation of the conventional granulation powder A serves as granulation powder B; a large amount of PVA is added, the spray drying temperature is increased, and granulation powder C is obtained; the granulation powder A, the granulation powder B and the granulation powder C are rolled in a coater according to a certain proportion and then screened, and semi-finished ball blanks with the diameter of 10-20 mm are obtained; the semi-finished ball blanks are rolled with a grinding material A till a 13-30 mm target semi-finished product is formed; finally, drying and firing are carried out, and the finished product is obtained. According to the method, the ball blanks similar to those prepared through isostatic forming are obtained by compounding the granulation powder with different characteristics, so that the ball blanks contain certain air holes, cracks caused by heat shock in the firing and cooling processes are reduced, and the reinforcing and toughening effects are achieved.

Description

technical field [0001] The invention relates to a method for preparing high-pressure-resistant alumina grinding media by roll forming, and belongs to the technical field of ceramic materials. Background technique [0002] The alumina grinding medium is due to the direct impact on the material during the grinding process, and the lack of a buffer stage between the impact and the alumina ball stone, which eventually leads to broken balls, slag drop, cracking, deformation and other symptoms. The above-mentioned various defects will lead to lower and lower ball milling efficiency, greatly reducing the service life of alumina balls, and at the same time, a large number of falling impurities will cause destructive pollution of the ground materials. The above problems are particularly prominent when the compressive strength of the alumina balls is low. [0003] Isostatically formed grinding balls have a much higher compressive strength than roll formed grinding balls. For example...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/626C09K3/14
CPCC04B35/10C04B35/62695C04B2235/3208C04B2235/3418C04B2235/3472C04B2235/349C04B2235/5445C04B2235/5454C04B2235/94C04B2235/95C04B2235/96C09K3/1409
Inventor 赵友谊曾华生王琦尹栋超
Owner 山东谊星新材料有限公司
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