Rare earth polishing powder and preparation method thereof

A kind of rare earth polishing powder, rare earth technology, applied in the direction of polishing composition containing abrasives, etc., can solve the problems of complex mixing process of fluoride and oxide, high true density of rare earth polishing powder, low utilization rate of polishing powder, etc., to achieve The effect of promoting the amount of rare earth ejection, increasing the amount of ejection, and lowering the cost

Inactive Publication Date: 2014-02-12
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

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
[0012] At the same time, the true density of the rare earth polishing powder is relatively high, which makes the polishing powder easy to precipitate during use, resulting in a low utilization rate of the polishing powder

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
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Effect test

Embodiment 1

[0049] In 400kg pure water, add 100kg lanthanum cerium carbonate (TREO is 45%, CeO 2 / TREO is 65%), slowly add hydrochloric acid under stirring conditions, until the pH is 1.5, and filter to obtain a clear and transparent aqueous solution A of lanthanum cerium chloride.

[0050] Take 90kg of ammonium bicarbonate, 3kg of ammonium fluoride, and 5kg of ammonium sulfate, add them to 900kg of pure water, dissolve until clarified, and filter to obtain precipitation solution B.

[0051] The precipitation solution B was slowly added to the lanthanum cerium chloride aqueous solution A heated to 65°C, and the stirring was continued for 4 hours after the addition was completed.

[0052] Then, it was centrifugally dehydrated, calcined at 860°C for 5 hours, and pulverized by air flow until the D50 was 2.0 μm to obtain the rare earth polishing powder. figure 1 It is an XRD schematic diagram of the rare earth polishing powder obtained in Example 1 of the present invention.

Embodiment 2

[0054] In 234kg pure water, add 100kg lanthanum cerium carbonate (TREO is 50%, CeO 2 / TREO is 70%), slowly add hydrochloric acid under stirring conditions, until the pH is 2.5, and filter to obtain a clear and transparent aqueous solution A of lanthanum cerium chloride.

[0055] Take 90kg of ammonium bicarbonate, 6kg of ammonium fluoride, and 10kg of ammonium sulfate, add them to 600kg of pure water, dissolve until clarified, and filter to obtain precipitation solution B.

[0056] The precipitation liquid B was slowly added to the lanthanum cerium chloride aqueous solution A heated to 85° C., and the stirring was continued for 2 h after the addition was completed.

[0057] Then it was dehydrated by plate and frame filter press, calcined at 940°C for 3 hours, and crushed by air flow until D50 was 0.60 μm to obtain the rare earth polishing powder.

Embodiment 3

[0059] In 400kg of pure water, add 100kg of lanthanum carbonate cerium praseodymium (TREO is 45%, CeO 2 / TREO is 65%, Pr 6 o 11 / TREO is 3%), slowly add hydrochloric acid under stirring conditions, until the pH is 1.5, and filter to obtain a clear and transparent aqueous solution A of lanthanum cerium chloride.

[0060] Take 90kg of ammonium bicarbonate, 4kg of ammonium fluoride, and 4kg of ammonium sulfate, add them to 800kg of pure water, dissolve until clarified, and filter to obtain precipitation solution B.

[0061] The precipitation solution B was slowly added to the lanthanum cerium chloride aqueous solution A heated to 70°C, and the stirring was continued for 3 hours after the addition was completed.

[0062] Then it was dehydrated by vacuum filtration, calcined at 900° C. for 4 hours, and pulverized by airflow until D50 was 1.2 μm to obtain the rare earth polishing powder.

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Abstract

The invention relates to rare earth polishing powder, which is uniform solid solution with the crystal forms of fluorine oxide rare earth and cubic phase rare earth oxide. The invention further discloses a preparation method for the rare earth polishing powder. The preparation method comprises the steps of preparation of rare earth aqueous solution, precipitation, dehydration, roasting, smashing and the like. The prepared rare earth polishing powder is uniform solid solution with the crystal forms of fluorine oxide rare earth and cubic phase rare earth oxide. According to the rare earth polishing powder and preparation method thereof, F is introduced in precipitation process, the later fluorization step can be omitted, and the preparation method has the advantages of being simple in process, low in cost, and less in waste water. Through adding ammonia sulfate in the precipitation process, when high-temperature roasting is performed, on one hand, the condition that crystal lattices of the main active ingredient cerium oxide in the polishing powder are disordered to form activated cerium oxide can be ensured, so that the activated cerium oxide and glass surface have affinity, the chemical activity of the polishing powder can be enhanced, and further the polishing mass of the polishing powder can be promoted; on the other hand, the cubic crystal form of the rare earth oxide can be ensured, and the polishing mass increase can be promoted.

Description

technical field [0001] The invention relates to a rare earth polishing powder and a preparation method thereof, in particular to a cerium-based mixed rare earth polishing powder suitable for surface polishing of precision devices in the electronic information industry such as integrated circuits, flat displays and optical glasses, 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 technology, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09G1/02
Inventor 赵月昌高玮陈曦蒙素玲郝祥杨筱琼
Owner 上海华明高纳稀土新材料有限公司
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