Production of high-cerium rare-earth polishing powder

A cerium-rich rare earth and production method technology, applied in the direction of polishing composition, chemical instruments and methods, etc., can solve the problems of difficult control of wear resistance and stability of polishing precision, easy fluctuation of product quality, etc., and achieve stability of polishing precision Easy control, easy control of wear resistance, effect of increasing grinding rate and wear resistance

Active Publication Date: 2007-04-04
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

The wear resistance and polishing accuracy stability of this polishing powder product composed of aggregate particles are difficult to control, and the product quality is also prone to fluctuations

Method used

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  • Production of high-cerium rare-earth polishing powder
  • Production of high-cerium rare-earth polishing powder
  • Production of high-cerium rare-earth polishing powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of seed crystals: Mix 1000 ml of lanthanum cerium chloride aqueous solution with a concentration of 60 g / L and 80 g of dimethyl oxalate, heat, stir and react at a temperature of 90° C., react for 1.5 hours, and age for 1 hour , can obtain the lanthanum cerium oxalate crystal seed that grain size is 0.5-1 micron, as shown in Figure 1;

[0026] (2) Precipitation: Add 10 grams of lanthanum cerium oxalate crystal seeds in 1000 milliliters of concentration in the lanthanum cerium chloride aqueous solution of 80 grams per liter, at 60 ℃, add the ammonium bicarbonate aqueous solution that concentration is 50 grams per liter while stirring, Until the pH value is 6.5, the precipitated lanthanum cerium carbonate is obtained;

[0027] (3) Fluorination: adding weight concentration in lanthanum cerium carbonate is 15% hydrofluoric acid aqueous solution to carry out partial fluorination, the addition of hydrofluoric acid is 7.5% of lanthanum cerium carbonate weight; ...

Embodiment 2

[0030] (1) Preparation of seed crystals: 1000 milliliters of lanthanum cerium nitrate aqueous solution with a concentration of 200 grams per liter were mixed with 250 grams of diethyl oxalate, heated and stirred for reaction at a temperature of 60° C., reacted for 2 hours, and aged for 2 hours. Lanthanum cerium oxalate seed crystals with a grain size of 0.5-1 micron can be obtained;

[0031] (2) Precipitation: Add 20 grams of lanthanum cerium oxalate crystal seeds in 1000 milliliters of concentration in the lanthanum cerium nitrate aqueous solution of 150 grams per liter, at 60 DEG C, adding concentration while stirring is the ammonium bicarbonate aqueous solution of 50 grams per liter until The pH value is 6.5, and the lanthanum cerium carbonate of precipitation is obtained;

[0032] (3) Fluorination: adding weight concentration in lanthanum cerium carbonate is 15% hydrofluoric acid aqueous solution to carry out partial fluorination, the addition of hydrofluoric acid is 8.5% ...

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Abstract

Production of cerium-enriched rare-earth polishing powder is carried out by preparing crystal seed, depositing to obtain lanthanum cerium carbonate, fluorating to obtain lanthanum cerium fluorine-carbonate, and calcining to obtain the final product. The grain diameter of single-crystal reaches to 1-2 micro. It's easy to control, has better abrasive resistance and grinding rate.

Description

technical field [0001] The invention relates to a production method of a rare earth polishing powder, more precisely, relates to a production method of a rare earth polishing powder whose color is white and whose cerium content is more than 75%. Background technique [0002] Rare earth polishing powder is used for polishing lenses, flat glass, glass bulbs, glasses, watch cases, etc. It has the characteristics of fast polishing speed and high precision. Since the invention of rare earth polishing powder in the 1940s, the production volume and application volume have gradually increased. The production process of rare earth polishing powder has changed with the progress of rare earth separation process. [0003] The early rare earth polishing powder used bastnaesite as raw material, as described in the CN1156749 and CN1205354 patents of Seimei Chemical Corporation of Japan, and later developed to use mixed rare earth carbonate as raw material for production. With the reducti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09G1/00
Inventor 高玮马新胜李福清陈国建陈刚
Owner 上海华明高纳稀土新材料有限公司
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