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Production method of a novel polishing alumina

A technology of alumina and particles, applied in chemical instruments and methods, alumina/aluminum hydroxide, alumina/hydroxide preparation, etc.

Inactive Publication Date: 2015-11-04
ALBEMARLE EURO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this usually requires at least vigorous de-agglomeration and often grinding

Method used

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  • Production method of a novel polishing alumina
  • Production method of a novel polishing alumina
  • Production method of a novel polishing alumina

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preparation example Construction

[0194] In the preparation of boehmite-based sol-gel corundum, the porous support method of the present invention readily accommodates suspended co-components (e.g. alpha alumina seeds), builders (e.g. Y 2 o 3 or lanthanides), growth inhibitors (e.g. MgO, SiO 2 、Cr 2 o 3 , ZrO 2 ) and other components known as the state of the art.

[0195] The term "component" is used for compounds present in the slurry. Such compounds may not necessarily be present in the final product due to their volatility and limited chemical inactivity. Components may also function as raw materials (raw materials) or dispersing additives, structure forming additives, mineralizers / annealing-calcination additives and binders. A simple system might consist of 72% ultrafine aluminum trihydroxide, 28% water and a trace amount of dispersant such as polyacrylate. This formulation, when applied to a support and subjected to a temperature of 1150°C for about 30 minutes and even longer, becomes a new polish...

Embodiment 2

[0219] Embodiment 2 (through acetic acid surface modification)

Embodiment 3

[0220] Embodiment 3 (dispersant)

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Abstract

Provided is a method for the formation of particulate compounds of selectable size characteristics, which method includes supporting a slurried particulate precursor on a porous support; heating the support such that aggregates of the particulate compound are formed, and desagglomerating the aggregates into their component particulate. In a preferred embodiment, an aqueous slurry of alumina particulate which has not undergone the alpha transition is contacted with a porous support having defined pore and cavity sizes, such that the slurry occupies at least some of the interstices of the porous support. The slurry and support are heated such that the alumina precursor slurry undergoes the alpha transition. The alpha alumina product is then particulated. The support is of such a material that it is either lost through combustion during heating or otherwise removable after heating, such as during or after particulation, without destroying the particle characteristics imparted by the porous support. Additionally, in a further embodiment, co-components are added to the slurry in order to impart desired properties to the particulated product.

Description

technical field [0001] This invention relates to the preparation of alpha alumina particles from alumina, aluminum hydroxide, aluminum salts and other aluminum compound precursors. More generally, the invention relates to particle formation from particle or solution precursors via heating. Background of the invention [0002] Alpha alumina powders are routinely produced from agglomerated / agglomerated alumina precursors by calcination. Many such precursors can be prepared by known processes, such as those involving the Bayer method of purifying raw aluminous ores. However, the high temperature required to subject the precursor to the transformation to alpha alumina complicates the formation of powdered alpha alumina product. Properties such as particle size and particle size distribution are difficult to control due to erratic heat conduction throughout the often loosely placed powdered mass. Typically, the calcination process forms hard lumps and aggregates. Such agglome...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C09G1/02C01F7/162C01F7/30C01F7/441C01F7/442
CPCC09K3/1427C01F5/08C01F7/02C01F7/023C01F7/162C01F7/30C01F7/441C01F7/442C01G15/00C01G23/006C01G25/02C01G37/00C01G45/1242C01G49/0045C01G49/0054C01G51/40C01P2004/03C01P2004/52C01P2004/61C01P2004/62C01P2006/12C09G1/02C09K3/1436C09D1/02
Inventor H.霍菲乌斯
Owner ALBEMARLE EURO
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