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Production of white cerium oxide

A cerium oxide and white technology, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve problems such as complex process, high product cost, and large pollution impact, and achieve simple process, low cost, and small environmental pollution Effect

Active Publication Date: 2009-07-29
BAOTOU TIANJIAO SEIMI POLISHING POWDER CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

There are two patents for the preparation method of white cerium oxide: one is to treat cerium salt with boron compound and then roast it to obtain white cerium oxide; the disadvantages and problems of this method are that the process is relatively complicated and the product higher cost
Another kind of yellow cerium oxide, cerium oxalate, cerium carbonate, cerium chloride and other cerium salts are used as raw materials, and then roasted after sulfuric acid or ammonium sulfate treatment to obtain white cerium oxide, such as Chinese patent (application number 91109167.X, Publication number CN1071144A); The shortcoming and problem that this method exists is that a large amount of SO can be produced in the manufacturing process 2 , SO 3 Gas, which has a relatively large impact on environmental pollution

Method used

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Experimental program
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Effect test

Embodiment 1

[0015] Embodiment 1: Get 100g of cerium carbonate, add water to adjust slurry. Slowly add 7g of hydrofluoric acid (40%) under stirring state, fully react for 30 minutes, filter and dry the slurry. Then it is divided into four parts and fired at 800°C, 850°C, 900°C, and 950°C for 3 hours respectively, and the baked products are naturally cooled to room temperature to obtain white cerium oxide products.

[0016] The raw material used here is cerium carbonate with the following characteristics:

[0017] TREO 44%~50%

[0018] CeO 2 / TREO>99.9%

[0019] The roasted product, that is, the white cerium oxide product, was tested and analyzed, and the results are shown in Table 1.

[0020] Table 1

[0021]

Embodiment 2

[0022] Embodiment 2: Take 5 parts of cerium carbonate, each 100g, add water respectively to make slurry. Then slowly add 3g, 7g, 10g, 13g, 16g of hydrofluoric acid (40%) under stirring state, fully react for 30 minutes, filter and dry the slurry. Then calcined at 900° C. for 3 hours each, and the calcined product was naturally cooled to room temperature to obtain a white cerium oxide product.

[0023] The roasted product was tested and analyzed, and the results are shown in Table 2.

[0024] Table 2

[0025]

Embodiment 3

[0026] Embodiment 3: get cerium chloride (TREO 45%, CeO 2 / TREO 99.9%) 500g water to make an aqueous solution, add 35g hydrofluoric acid (40%) under stirring, after fully reacting for 30 minutes, add ammonium bicarbonate until there is no rare earth in the supernatant, filter the slurry , wash, dry. Then divide the raw materials prepared by the above method into 5 parts, and roast them at 800°C, 850°C, 900°C, and 950°C for 3 hours respectively, and cool the calcined products to room temperature naturally.

[0027] The roasted product was tested and analyzed, and the results are shown in Table 3.

[0028] table 3

[0029]

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Abstract

The invention is a method for preparing white cerium oxide. The technical feature of the present invention is to use cerium carbonate or other cerium compounds as raw materials, undergo fluoridation treatment, and then undergo roasting and cooling treatment to obtain white cerium oxide with a true specific gravity of 6-8g / cm3 and TREO ≥ 85%. CeO2 / TREO≥90%Pr6O11 / TREO<1%, can be used as polishing material.

Description

[0001] 1. The technical field: [0002] The invention belongs to the technical field of hydrometallurgy and relates to a manufacturing method of a white cerium oxide material. 2. Background technology: [0003] At present, the commercially available cerium oxide products mainly include yellow cerium oxide and white cerium oxide, which are mainly used as raw materials for glass decolorizers, polishing materials and other products. and the product obtained. Not only can be used as a glass decolorizer, but also can be used as a polishing material to improve the polishing effect and obtain a high-precision glass polishing surface. There are two patents for the preparation method of white cerium oxide: one is to treat cerium salt with boron compound and then roast it to obtain white cerium oxide; the disadvantages and problems of this method are that the process is relatively complicated and the product higher cost. Another kind of yellow cerium oxide, cerium oxalate, cerium car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00
Inventor 李学舜谢兵杨国胜
Owner BAOTOU TIANJIAO SEIMI POLISHING POWDER CO LTD
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