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Rare-earth polishing powder and preparation method thereof

A rare earth polishing powder, lanthanum cerium carbonate technology, applied in chemical instruments and methods, polishing compositions containing abrasives, other chemical processes, etc., can solve the problem of low particle dispersibility, prone to agglomeration, and inability to maintain dispersion maintenance. and other problems, to achieve the effect of good suspension, high polishing accuracy and fast polishing speed

Inactive Publication Date: 2014-04-30
上海华明高纳稀土新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in fact, the smaller the particles of cerium-based abrasives, the lower the dispersibility, and the aggregation is easy to occur.
Even if the particle size is small, the dispersion maintenance cannot be improved, so just mixing in the dispersion medium and stirring cannot maintain sufficient dispersion maintenance.

Method used

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  • Rare-earth polishing powder and preparation method thereof
  • Rare-earth polishing powder and preparation method thereof
  • Rare-earth polishing powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] With 1000kg lanthanum cerium carbonate (REO is 45%, CeO 2 / TREO is 65%) mixed with 1000kg water, heated to 60°C, 80kg of 20% hydrofluoric acid is added dropwise, adjusted to pH 6.5 with 10% ammonium bicarbonate aqueous solution after the dropwise addition, kept for 1 hour, and dehydrated by centrifugation , Calcined at 900°C for 6h to obtain 450kg of calcined product. Mix 450kg of the roasted product with 2.28kg of citric acid and 4.56kg of magnesium oxide through a mixer, then air-jet milling, and dry-classify to D50 as D 50 =0.81μm, XRD results see figure 1 .

Embodiment 2

[0040] With 1000kg lanthanum cerium carbonate (REO is 50%, CeO 2 / TREO is 60%) mixed with 1000kg of water, heated to 80°C, 120kg of 20% hydrofluoric acid is added dropwise, after the dropwise addition, the pH is adjusted to 7 with 15% aqueous ammonium bicarbonate solution, kept for 2 hours, and dehydrated by centrifugation , Calcined at 900°C for 6h to obtain 500kg of calcined product. Mix 500kg of roasted product with 5.21kg of citric acid and 15.6kg of magnesium oxide through a mixer, then mechanically pulverize, and dry classify until D50 is D 50 =2.91 μm.

Embodiment 3

[0042] With 1000kg lanthanum cerium carbonate (REO is 50%, CeO 2 / TREO is 70%) mixed with 1000kg of water, heated to 70°C, 100kg of 20% hydrofluoric acid is added dropwise, adjusted to pH 6.8 with 12% ammonium bicarbonate aqueous solution after the dropwise addition, kept for 2 hours, and dehydrated by centrifugation , Calcined at 1000°C for 4h to obtain 500kg of calcined product. Mix 500kg of roasted product with 5.15kg of citric acid and 10.3kg of magnesium oxide through a mixer, then mechanically pulverize, and dry-classify until D50 is D 50 =1.81 μm.

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Abstract

The invention aims at disclosing rare-earth polishing powder and a preparation method thereof. The rare-earth polishing powder comprises the following components in parts by weight: 0.5-1 part of citric acid, 1-3 parts of magnesia and the balance of cerium lanthanum oxyfluoride, wherein the sum of the mass percents of the components is 100%. Compared with an existing product, the rare-earth polishing powder has the characteristics of being good in suspension property, free of colloidal or hardened sediments and the like when the polishing powder and the water are prepared into slurry to use. The polished glass is easy to clean, so that fast polishing speed and high polishing accuracy of the polishing powder in the use procedure are ensured. The rare-earth polishing powder is applicable to surface polishing of precision instruments in optical and photoelectric information industries such as mobile phone touch glass, liquid crystal display, optical glass and the like.

Description

technical field [0001] The invention relates to a rare earth polishing powder and a preparation method thereof, in particular to a rare earth polishing powder suitable for surface polishing of precision devices in optical, optoelectronic and information industries such as mobile phone touch glass, liquid crystal display and optical glass, and a preparation method thereof. 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 techn...

Claims

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Application Information

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IPC IPC(8): C09G1/02C09K3/14
Inventor 赵月昌高玮高璐蒙素玲郝祥杨筱琼
Owner 上海华明高纳稀土新材料有限公司
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