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Rare earth polishing powder and preparation method thereof

A technology of rare earth polishing powder and polishing powder, which is applied in the direction of polishing compositions containing abrasives, etc., can solve the problem that polishing powder cannot be used for precision polishing, and achieve the effect of enhancing wear resistance

Active Publication Date: 2020-12-15
BAOTOU TIANJIAO SEIMI POLISHING POWDER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Rare earth concentrate contains 6-8% F, REO>70%, CeO 2 / TREO>48%, can be used as the raw material of rare earth polishing powder, through ball milling, calcining, and classification to prepare cerium-based rare earth polishing powder, because the concentrate contains a large amount of non-rare earth gangue, this type of polishing powder cannot be used for precision polishing

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

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preparation example Construction

[0074] The preparation method of rare earth polishing powder, concrete steps are as follows:

[0075] Step 1: Prepare rare earth fluorocarbonates of rare earth elements lanthanum, cerium, samarium, and yttrium, and the amount of fluorine added is 5% to 10% of REO;

[0076] Raw materials are single rare earth chlorides, mixed rare earth chlorides, lanthanum-rich rare earth chlorides, rare earth carbonates or rare earth nitrates, of which lanthanum (La 2 o 3 / TREO>75%), samarium (Sm 2 o 3 / TREO>99.9%), cerium (CeO 2 / TREO=99.95%), Yttrium (Y 2 o 3 / TREO=99.999%).

[0077] Preparation method 1 of rare earth fluorocarbonate: Mix the solutions of lanthanum chloride, cerium chloride, samarium chloride, and yttrium chloride according to the set ratio, put the mixed material liquid into the reaction kettle, and adjust the rare earth element oxide (REO) Concentration = 50-100g / L, control the reaction temperature at 40°C-65°C, add metered hydrofluoric acid, phosphoric acid, and a...

Embodiment 1

[0115] With 6000ml lanthanum cerium rare earth chloride feed solution (REO=274g / L, CeO 2 / TREO=74.28%, La 2 o 3 / TREO=25.72%), 714ml samarium chloride feed solution (REO=126g / L, Sm 2 o 3 / TREO=99.2%), 412ml yttrium chloride feed solution (REO=80.2g / L, Y 2 o 3 / TREO=99.99%) were uniformly mixed, placed in a 50L enamel reaction kettle, and 18L deionized water was added. Stir well and heat to 55°C. This mixed liquid is designated as liquid A.

[0116] Take NH 4 HCO 3 Solution (120g / L) 22L is packed in another 50L enamel reaction kettle, add 250g hydrofluoric acid (50%, wt%), 82g phosphoric acid (85%, wt%), this solution is heated to 55 ℃. This mixed liquid is designated as liquid B.

[0117] Add solution B to solution A at a rate of 350ml / min for reaction. After the reaction, it was aged at 40° C. for 8 hours. Aspirate the supernatant, add 20L deionized water, keep stirring at 40°C to wash the precipitate, and repeat the washing once. Suction filter with Buchner funn...

Embodiment 2

[0125] Weigh 2000g lanthanum cerium carbonate (REO=48.78%, CeO 2 / TREO=65%), 445g samarium carbonate (REO=45.12%, Sm 2 o 3 / TREO=99.5%), 100g yttrium carbonate (REO=44.38%,

[0126] Y 2 o 3 / TREO=99.5%), put in a 5000ml beaker, add 1.2L deionized water, heat to 40°C, add 500g hydrofluoric acid (50%, wt%), and place the mixture at 40°C for 16 hours.

[0127] Transfer the above mixed solution into a 50-liter disperser, add 5 L of water, add 5500 g of lanthanum cerium carbonate, and disperse vigorously for 30 minutes. Filter with suction and dry at 150°C. The dried product is placed in a crucible and calcined in a muffle furnace in the calcination mode 1. The fired product is classified to obtain the quaternary rare earth polishing powder of the present invention, which is denoted as P-2, and the measurement results are shown in Table 3.

[0128] Such as Figure 8 Shown is the XRD diffraction pattern of the quaternary rare earth polishing powder in Example 2 of the presen...

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Abstract

The invention discloses a preparation method of rare earth polishing powder. The method comprises the following steps of: preparing rare earth fluorocarbonate of rare earth elements lanthanum, cerium,samarium and yttrium, with the addition amount of fluorine being 5%-10% of REO; and roasting and grading the rare earth fluorocarbonate to obtain the rare earth polishing powder. The invention further discloses rare earth polishing powder, which comprises cerium oxide and yttrium oxide, the total amount of rare earth oxide of cerium oxide accounts for 45w%-85w% of CeO2 / TREO, the total amount of rare earth oxide of yttrium oxide accounts for 1w%-10w% of Y2O3 / TREO, and the molar ratio of REO to Y2O3 is 1:0.015-0.15. By precisely calculating the addition amount of Y2O3, the lattice constant of CeO2 is reduced, oxygen vacancies are formed, and the wear resistance, grinding force and reaction activity of the polishing powder are enhanced.

Description

technical field [0001] The invention belongs to the field of rare earth grinding and polishing materials, and in particular relates to a rare earth polishing powder and a preparation method thereof. Background technique [0002] Cerium oxide has been used as a grinding and polishing material for glass since the 1940s. It has become an efficient glass polishing material and has completely replaced glass grinding and polishing materials that have been used for thousands of years, such as tin oxide and iron oxide. After 2010 in this century, due to the full popularity of smart phones and Pads, the polishing of TFT-LCD, STN-LCD, and cover plates has greatly increased the demand for polishing materials based on cerium, from thousands of tons per year to about 40,000 tons . Cerium-based rare earth polishing powder is the most efficient glass polishing material currently used. According to the research of W.Silvernail, the polishing efficiency of cerium is the highest among the 19...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09G1/02
CPCC09G1/02
Inventor 黄绍东杨国胜张存瑞周薇赵延刘露涛程磊杜悦王泽门宇剑
Owner BAOTOU TIANJIAO SEIMI POLISHING POWDER CO LTD
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