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A kind of refining method of high-purity cerium carbonate

A refining method, cerium carbonate technology, applied in chemical instruments and methods, rare earth metal compounds, inorganic chemistry, etc., can solve problems such as improper operation, process design defects, and low purity

Active Publication Date: 2016-08-17
乐山沃耐稀电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above method can prepare cerium carbonate, but the purity may be low due to improper operation or process design defects, so it is necessary to design a scheme to purify low-purity cerium carbonate

Method used

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  • A kind of refining method of high-purity cerium carbonate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Add nitric acid solution in 1000g of cerium carbonate crude product to dissolve, and the acid solution added should just completely dissolve the cerium carbonate crude product, and the pH value of the solution at this time is lower than 4; the content of cerium carbonate in the cerium carbonate crude product is 92.1%; The nitric acid solution is a mixture of concentrated nitric acid and pure water, and the conductivity of the pure water is 0.47us / cm; the pH value of the nitric acid solution is 4.2.

[0021] (2) Add concentrated ammonia water to the acid solution until the pH value is 4.5, and filter with a filter cloth to remove the precipitate, acid insoluble matter and oily substances in the solution.

[0022] (3) The solution after the coarse filtration is subjected to microporous filtration, the pore size of the microporous filtration is 1.0 μm, and a fine filtrate is obtained after filtration.

[0023] (4) Add 3 mL of 10 mol / L nitric acid solution and 0.5 mL of...

Embodiment 2

[0026] (1) Add nitric acid solution to 1000g of crude cerium carbonate to dissolve it. It is advisable that the added acid solution just completely dissolves the crude cerium carbonate, and the pH value of the solution at this time is 3.8. The content of cerium carbonate in the crude cerium carbonate is 92.1%; the nitric acid solution is a mixture of concentrated nitric acid and pure water, and the conductivity of the pure water is 0.45us / cm; the pH value of the nitric acid solution is 4.4.

[0027] (2) Add concentrated ammonia water to the acid solution until the pH value is 4.5, and filter with a filter cloth to remove the precipitate, acid insoluble matter and oily substances in the solution.

[0028] (3) The solution after the coarse filtration is subjected to microporous filtration, the pore size of the microporous filtration is 1.0 μm, and a fine filtrate is obtained after filtration.

[0029] (4) Add 4 mL of 10 mol / L nitric acid solution and 0.6 mL of 27% hydrogen perox...

Embodiment 3

[0032] (1) Add nitric acid solution to dissolve the 1000g cerium carbonate crude product, and the acid solution added should just completely dissolve the cerium carbonate crude product, and the pH value of the solution at this time is lower than 4; the content of cerium carbonate in the cerium carbonate crude product is 92.1%; The nitric acid solution is a mixture of concentrated nitric acid and pure water, and the conductivity of the pure water is 0.47us / cm; the pH value of the nitric acid solution is 4.2.

[0033] (2) Add concentrated ammonia water to the acid solution until the pH value is 4.5, and filter with a filter cloth to remove the precipitate, acid insoluble matter and oily substances in the solution.

[0034] (3) The solution after the coarse filtration is subjected to microporous filtration, the pore size of the microporous filtration is 1.0 μm, and a fine filtrate is obtained after filtration.

[0035] (4) Evaporate the fine filtrate to a saturated solution. The...

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Abstract

The invention discloses a method for refining high-purity cerium carbonate. The method comprises the following steps: an acidizing fluid is added to a crude cerium carbonate product for dissolution; ammonia water is added to the acidizing fluid until the pH is 4-4.5, filtering is performed to remove impurities, and a crude filtrate is obtained; a nitric acid solution and a hydrogen peroxide solution are added to a fine filtrate, the mixture is evaporated into a saturated solution, the saturated solution is cooled to separate crystals out, the crystals are separated to obtain a semi-finished product; the semi-finished product is dissolved in pure water, an ammonium bicarbonate solution after refining treatment is added for precipitation, the PH of a precipitation end point is controlled, and centrifugal dewatering and washing are performed to obtain the high-purity cerium carbonate. Low-purity cerium carbonate crystals can be purified to prepare the high-purity cerium carbonate crystals.

Description

technical field [0001] The invention relates to a refining process of rare earth raw materials, in particular to a method for refining low-purity cerium carbonate to generate high-purity cerium carbonate. Background technique [0002] Cerium carbonate is an important compound containing rare earth element cerium, which has been extensively studied and used in many fields, such as stabilizer, color remover, polishing powder, and alloy material for glass products. [0003] The invention of CN 102795652 A discloses a controlled preparation method of basic cerium carbonate dendrites. Dissolve soluble cerium salt in distilled water, stir continuously, add ammonia water slowly, and finally add precipitant to form a mixed solution, and then mix the Transfer the solution to a high-pressure reactor, seal it, heat it in a constant temperature box, and control the temperature to complete the hydrothermal reaction to obtain a hydrothermal reaction product; wash the hydrothermal reaction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00
Inventor 杨青
Owner 乐山沃耐稀电子材料有限公司