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Preparation method of cerium-based mixed rare earth polishing powder

A technology of rare earth polishing powder and mixed rare earth, which is applied in the direction of polishing composition containing abrasives, etc. It can solve the problems of complex mixing process of fluoride and oxide, complex post-treatment process, secondary sintering of particles, etc., and achieve polishing accuracy Easy to control, low cost, and the effect of ensuring the uniformity of fluorination

Active Publication Date: 2014-01-29
BAOTOU XINYUAN POLISHING POWDER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rare earth fluoride particles are relatively fine, and the post-treatment process is complicated; at the same time, the mixing process of fluoride and oxide is also relatively complicated; this method will cause the phenomenon of secondary sintering of particles, and some particles will grow abnormally after secondary roasting, forming Localized coarse particles that cause scratches during polishing

Method used

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  • Preparation method of cerium-based mixed rare earth polishing powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In rare earth chloride, the mass ratio of each component is:

[0039] The total amount of rare earth REO is 45%, cerium oxide is 70%, lanthanum oxide is 29.95%, and the balance is 0.05% of praseodymium oxide;

[0040] Mix the above 1000kg rare earth chloride with 2000kg water, add 180kg30% hydrogen peroxide, 142kg40% fluosilicic acid and 20kg98% sulfuric acid in sequence. After fully stirring, heat to 60°C, slowly add 10% ammonium bicarbonate aqueous solution until the pH at the end point is 6.5, and keep warm for 12 hours. After centrifugal dehydration, dry at 100°C for 15 hours to obtain partially fluorinated rare earth carbonate.

[0041] Mix the above 1000kg rare earth chloride with 2000kg water, stir well and heat to 60°C, slowly add 10% ammonium bicarbonate aqueous solution until the pH at the end is 6.5, and keep warm for 12h. After centrifugal dehydration, dry at 100°C for 15 hours to obtain rare earth carbonate.

[0042] Partially fluorinated rare earth carb...

Embodiment 2

[0044] In rare earth chloride, the mass ratio of each component is:

[0045] The total amount of rare earth REO is 45%; cerium oxide is 60%; lanthanum oxide is 34%; praseodymium oxide is 6%;

[0046]Mix the above 1000kg rare earth chloride with 2000kg water, add 225kg of 30% hydrogen peroxide, 214kg of 40% fluosilicic acid and 40kg of 98% sulfuric acid. After fully stirring, heat to 80°C, slowly add 15% ammonium bicarbonate aqueous solution until the pH value at the end is 7, and keep warm for 5 hours. After centrifugal dehydration, dry at 200°C for 10 hours to obtain partially fluorinated rare earth carbonate.

[0047] Mix the above-mentioned 1000kg rare earth chloride with 2000kg water, stir well and heat to 60°C, slowly add 10% ammonium bicarbonate aqueous solution until the pH value at the end is 7, and keep warm for 5h. After centrifugal dehydration, dry at 200°C for 10 hours to obtain rare earth carbonate.

[0048] Partially fluorinated rare earth carbonate and rare e...

Embodiment 3

[0050] In rare earth chloride, the mass ratio of each component is:

[0051] The total amount of rare earth REO is 45%; cerium oxide is 60%; lanthanum oxide is 36% and praseodymium oxide is 4%;

[0052] Mix the above 1000kg rare earth chloride with 2000kg water, add 210kg30% hydrogen peroxide, 178kg40% fluosilicic acid and 30kg sulfuric acid with a mass concentration of 98%. After fully stirring, heat to 70° C., slowly add an aqueous ammonium bicarbonate solution with a mass concentration of 12%, until the pH at the end point is 6.8, and keep warm for 8 hours. After centrifugal dehydration, dry at 160°C for 12 hours to obtain partially fluorinated rare earth carbonate.

[0053] Mix the above 1000kg rare earth chloride with 2000kg water, stir well and heat to 70°C, slowly add ammonium bicarbonate aqueous solution with a mass concentration of 12%, until the pH at the end is 6.8, and keep warm for 8h. After centrifugal dehydration, dry at 160°C for 12 hours to obtain rare earth...

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Abstract

The invention discloses a preparation method of cerium-based mixed rare earth polishing powder. The preparation method comprises the following steps: 1, dissolving chlorinated rare earth in water; adding hydrogen peroxide, fluosilicic acid and sulfuric acid, heating, adding an ammonium bicarbonate solution to precipitate to adjust the pH value of the obtained solution to 6.5-7, carrying out temperature maintenance, centrifuge-dewatering, and drying to obtain partially fluorinated rare earth carbonate; 2, dissolving the chlorinated rare earth in water, adding the ammonium bicarbonate solution to precipitate the solution and adjust the pH value of the obtained solution to 6.5-7, centrifuge-dewatering, and drying to obtain rare earth carbonate; 3, mixing the partially fluorinated rare earth carbonate with rare earth carbonate according to a mass ratio of 1:0.35-1:1.5, and crushing; 4, roasting for 4-6h at 950-1100DEG C to obtain a precursor; and 5, crushing and grading the precursor to obtain the cerium-based mixed rare earth polishing powder. The cerium-based mixed rare earth polishing powder of the invention, which has the advantages of good abrasion resistance, rapid polishing rate, easily controlled polishing precision, low cost, and no pollution, is suitable for the surface polishing of precious devices.

Description

technical field [0001] The invention relates to a preparation method of a rare earth polishing powder, in particular to a preparation method of a cerium-based mixed rare earth polishing powder used for surface polishing of precision devices in the electronic information industry such as integrated circuits, flat displays, and optical glasses. Background technique [0002] At present, various glass materials are widely used, and these materials need to undergo necessary surface polishing before being applied. In the early days, materials such as zirconia, iron oxide or silicon dioxide were mainly used to polish various glass surfaces. In recent years, considering the polishing efficiency and precision, polishing materials with rare earth oxides (especially cerium oxide) as the main component have been used. It is considered more suitable for surface polishing of glass materials. [0003] With the rapid development of electronic information technology, the demand for glass su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09G1/02
Inventor 赵月昌杨筱琼尹先升赵秀娟陈曦贾嘉
Owner BAOTOU XINYUAN POLISHING POWDER CO LTD
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