High-aluminum ceramic filler prepared from gamma aluminum oxide and preparation method of high-aluminum ceramic filler

A technology of high-alumina ceramics and γ-alumina, applied in the field of high-alumina ceramic fillers, can solve the problems of product price increase, inability to adapt, and high industrial cost of high-alumina ceramic fillers

Active Publication Date: 2022-02-08
朱建良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, for high-alumina porcelain with an alumina content of more than 85%, it cannot be prepared from raw materials with an alumina content of less than 95%, such as waste roller powder, calcined bauxite, and calcined kaolin. Instead, Al 2 o 3 Higher content of alumina powder to prepare
This calcination process consumes a lot of fuel and produces a lot of carbon emissions! It cannot adapt to the trend of global sustainable development and the goal of my country's carbon peak! At the same time, such a calcination process has also led to a substantial increase in product prices - the ton price of calcined alumina is 1.5 to 2 times the ton price of industrial alumina! The high-alumina ceramic filler industry has high cost, low benefit and weak competitiveness

Method used

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  • High-aluminum ceramic filler prepared from gamma aluminum oxide and preparation method of high-aluminum ceramic filler
  • High-aluminum ceramic filler prepared from gamma aluminum oxide and preparation method of high-aluminum ceramic filler
  • High-aluminum ceramic filler prepared from gamma aluminum oxide and preparation method of high-aluminum ceramic filler

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: According to industrial alumina 89kg, Turkish colemanite 3.5kg, silica fume 2.5kg, dolomite 2.5kg, ball clay 2.5kg batching, add water 55kg, polyacrylic acid ammonium dispersant 0.2kg, go out after ball milling 36 hours Grinding, spray drying and granulation, rolling enamel into balls, drying and firing in a kiln, heating up linearly at a constant speed , heat preservation at 1100°C for 1 hour, firing temperature at 1410°C, high fire Warming time 2.5 hours , Total firing time 44 hours . The alumina content of the product is 91.05%, XRD analysis shows that ɑ-Al in the porcelain 2 o 3 High content, no γ-Al at all 2 o 3 Existence, the water absorption rate of the product is 4.94%, the crushing resistance of ceramic balls with a diameter of 50mm is greater than 50kN, the acid resistance is 96.8%, the alkali resistance is 94.7%, and the resistance to rapid temperature changes (320°C → 20°C in the air) does not crack more than once, the highest resistanc...

Embodiment 2

[0056] Embodiment 2: According to industrial alumina 89kg, Turkish colemanite 3.5kg, silica fume 2.5kg, dolomite 2.5kg, ball clay 2.5kg batching, add water 55kg, polyacrylic acid ammonium dispersant 0.2kg, go out after ball milling 36 hours Grinding, spray drying and granulation, rolling enamel into balls, drying and firing in a tunnel kiln, heating at a uniform speed, The total firing time is 45 hours, including 2 hours at 1100°C , the firing temperature is 1410°C, and the high-fire holding time is 2 hours . The alumina content of the product is 91.09%. After XRD semi-quantitative analysis by Foshan Ceramics Research Institute Co., Ltd. (test report number: L2064 / W211024-03), the ɑ-Al in the porcelain parts 2 o 3 The content is about 64%, anorthite about 4%, nepheline 1%, amorphous phase about 31%, no γ-Al at all 2 o 3 exists (see attached figure 1 ), using the SNE-3000MS electron microscope to observe the porcelain pieces, and get the attached figure 2 , 3 , 4 pho...

Embodiment 3

[0057] Embodiment 3: press industrial alumina 89kg, Turkey colemanite 3.5kg, silica fume 2.5kg, dolomite 2.5kg, ball clay 2.5kg batching, add water 55kg, Sodium citrate dispersant 0.2kg, milled after 36 hours, spray-dried and granulated, rolling and enameled into balls, dried and fired in a tunnel kiln, and the temperature was raised linearly at a uniform speed. The total firing time is 45 hours, the firing temperature is 1410°C, the highest Fire holding time 2.5 hours . The alumina content of the product is 91.02%, and the XRD analysis of ɑ-Al in the porcelain parts 2 o 3 The content is very high, and there is still a very small amount of γ-Al 2 o 3 Existence, the water absorption rate of the product is 4.36%, the crushing resistance of ceramic balls with a diameter of 50mm is greater than 50kN, the acid resistance is 96.2%, the alkali resistance is 94.1%, and the resistance to rapid temperature changes (320°C → 20°C in the air) does not crack more than once, the highe...

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Abstract

The invention discloses a high-aluminum ceramic filler prepared from gamma aluminum oxide and a preparation method of the high-aluminum ceramic filler. The high-aluminum ceramic filler is prepared from 83-94 wt% of an aluminum oxide raw material with a main crystal phase being gamma-Al2O3, 2-5 wt% of a borate mineral or a synthesized borate compound, 1-4 wt% of ball clay, 1-4 wt% of nano silicon dioxide, 1-4 wt% of a calcium-magnesium complex mineral and 0-7 wt% of calcined aluminum oxide powder. According to the invention, the technological process is simplified, the procedure of converting gamma-Al2O3 into alpha-Al2O3 through calcination is not needed, the high-aluminum ceramic filler is directly prepared from gamma-Al2O3, carbon emission and energy consumption are greatly reduced, the product percent of pass is high, and the performance reaches or exceeds the standard requirement of the chemical industry. The high-aluminum ceramic filler can be used as a supporting or covering material for chemical reaction tower (device) beds in petrochemical industry, coal chemical industry, chemical fertilizer, nonferrous metallurgy and the like.

Description

technical field [0001] The invention relates to a ceramic filler and a preparation method, in particular to a high-alumina ceramic filler prepared from gamma alumina and a method thereof. Background technique [0002] In petrochemical, coal chemical, large chemical fertilizer, smelting, pharmaceutical, fine chemical and other industries, a large number of high alumina ceramic balls are used as the supporting material of the reaction tower and placed at the bottom to carry hundreds of tons of reaction fillers or catalysts. At the same time, it plays the role of uniformly and efficiently distributing the reaction medium; there are also applications where high-alumina ceramic balls are placed on the top of the reaction filler or catalyst layer to protect the catalyst, prevent it from overheating and poisoning, and efficiently disperse the reaction medium. It can be seen that high alumina ceramic balls are extremely important to chemical production. [0003] According to incomp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/111C04B35/622C04B35/64
CPCC04B35/111C04B35/622C04B35/64C04B2235/3418C04B2235/3409C04B2235/96
Inventor 朱建良邹江文王春泉钟麟贺佳曹南萍
Owner 朱建良
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