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Rich cerium rare earth polishing powder and preparation method thereof

A technology of cerium-rich rare earths and cerium-rich mixed rare earths, which is applied in the direction of polishing compositions containing abrasives, etc., can solve problems such as unstable product quality, difficulty in control, and environmental pollution, and achieve narrow particle size distribution range, small pollution, and high composition uniform effect

Inactive Publication Date: 2013-02-20
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product quality of this method is unstable, difficult to control, and waste gas is emitted during the production process, polluting the environment

Method used

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  • Rich cerium rare earth polishing powder and preparation method thereof
  • Rich cerium rare earth polishing powder and preparation method thereof
  • Rich cerium rare earth polishing powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Get 50g / l lanthanum cerium chloride solution (CeO -2 / TREO=65.7%, La 2 o -3 / TREO=34.2%, Pr 6 o 11 / TREO≤0.1%, Nd 2 o 3 / TREO≤0.1%) 2000ml and 50g / l cerium chloride solution 500ml, preheat at 50℃ for 0.5h. Add ammonium bicarbonate solution preheated at 50°C for 0.5h to pH = 7, stop the dropwise addition, age at 40°C for 2h after the reaction is complete, and filter to obtain lanthanum cerium carbonate and cerium carbonate for use.

[0033] Add 21ml of hydrofluoric acid (40%) to the cerium carbonate after mixing with water, react at 50°C for 0.5h, then age at 50°C for 2h, filter, and pre-calcine at 350°C for 2.5h to obtain cerium fluoride.

[0034] Cerium fluoride was mixed with the prepared lanthanum cerium carbonate, slurried, ball milled for 0.5h, and spray-dried at 150°C. Then it was roasted at a heating rate of 6°C / min, kept at 500°C for 0.5h, and then fired at 900°C for 5h. That is, the cerium-rich rare earth polishing powder is obtained.

[0035] Its spec...

Embodiment 2

[0038] Get 80g / l lanthanum cerium chloride solution (CeO -2 / TREO=64.3%, La 2 o -3 / TREO=33.2%, Pr 6 o 11 / TREO=2.4%, Nd 2 o 3 / TREO≤0.1%) 1250ml and 100g / l cerium chloride solution 220ml, preheat at 50℃ for 0.5h. Add dropwise 0.9 mol / l ammonium bicarbonate solution preheated at 50°C for 0.5 h, stop at pH=6.5, and stir until the reaction is complete. Aged at 40°C for 2h, filtered to obtain lanthanum cerium carbonate and cerium carbonate.

[0039] Add water to the prepared cerium carbonate, add 18.5ml of HF (40%), react at 40°C, filter, and pre-calcine at 300°C for 2.5h to obtain cerium fluoride.

[0040] Cerium fluoride was mixed with prepared lanthanum cerium carbonate, slurried, ball milled for 0.5h, filtered, and spray-dried at 150°C. Then calcined at a heating rate of 6°C / min and calcined at 950°C for 5h to obtain cerium-rich red rare earth polishing powder.

[0041] The measured specific surface area is 5.903m 2 / g,D 50 =2.28μm, D 100 =7.51 μm.

[0042] figu...

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Abstract

The invention discloses a preparation method of a rich cerium rare earth polishing powder. The method includes the following steps that a precipitator is added in a soluble rich cerium mixed rare earth salt solution and a pure cerium rare earth salt solution to obtain a cerium containing mixed rare earth precipitation and a pure cerium rare earth precipitation, the pure cerium rare earth precipitation is fluorated to obtain cerium fluoride, the cerium fluoride is subjected to preliminary roasting and mixed with the cerium containing mixed rare earth precipitation to obtain a mixture, and the mixture is subjected to wet ball milling, spray drying and high-temperature roasting to obtain the rich cerium rare earth polishing powder. The preparation method of the rich cerium rare earth polishing powder has the advantages that a novel process of subjecting the cerium precipitation with a single component to perfluorination, preliminary roasting and ball-milling with the cerium containing mixed rare earth precipitation is utilized, so that the volume center particle size D50 of the produced rich cerium rare earth polishing powder is smaller than or equal to 2.5mum, the maximum particle size D100 is smaller than or equal to 8mum, the specific surface area is in a range from 2m2 / g to 6m2 / g, the dispersibility is good, the particle size distribution is narrow, the product quality is easy to control, and the abrasive resistance and polishing accuracy of the polishing powder are improved.

Description

[0001] technical field [0002] The invention relates to a cerium-rich rare earth polishing powder and a preparation method thereof, especially CeO 2 The production method of cerium-rich rare earth polishing powder with / TREO≧55%, more precisely, relates to a cerium-rich rare earth polishing powder with small median particle size, narrow particle size distribution and high polishing precision and its preparation method. Background technique [0003] Rare earth polishing powder is mainly used for polishing flat glass, lens, photomask, glasses, LCD and gemstones. The main component of rare earth polishing powder is CeO 2 . [0004] Since the advent of rare earth polishing powder in the last century, the output and application fields have grown rapidly. But at present, compared with foreign imported products, the polishing powder produced in our country has a lower grade and a larger gap, and there are fewer varieties and grades. In recent years, liquid crystal displays, el...

Claims

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Application Information

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IPC IPC(8): C09G1/02
Inventor 李梅柳召刚杨来东胡艳宏王觅堂张永强
Owner INNER MONGOLIA UNIV OF SCI & TECH
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