Production method of low-Cl-oilless cerium carbonate product with large specific gravity

A production method, cerium carbonate technology, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve the problem of high cost

Inactive Publication Date: 2010-12-01
甘肃稀土新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the production process of crystalline cerium nitrate, a large amount of cerium nitrate mother liquor is generated, and the initial treatment method is to mix it in proportion to t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] will be 1.5m 3 Rare earth oxide content REO=465g / L cerium nitrate mother liquor into 10m 3 In the FRP stirring tank, add 1.5m 3 Dilute with deionized water, start stirring, and slowly add ammonium bicarbonate aqueous solution with a concentration of 30%. After 40 minutes of preparation, the pH of the solution is 3.5. Put the prepared solution into an enamel tank and heat to 45°C. After passing through the cerium carbonate filter cake After filtering to remove oil and iron, the filtrate was 2.0m 3 into 10m 3 In the FRP stirring tank, turn on the steam valve, turn on the steam valve, heat the raw material solution to a temperature of 85°C, start stirring, and slowly add a 30% aqueous solution of ammonium bicarbonate as a precipitating agent. During the precipitation process, ensure that the precipitation temperature is between 85-90°C Between, the precipitation time is 150 minutes, and the pH of the precipitation end point is 6.5. After the precipitation is complete, c...

Embodiment 2

[0013] will be 1.5m 3 Rare earth oxide content REO=498g / L cerium nitrate mother liquor into 10m 3 In the FRP stirring tank, add 1.5m 3 Dilute with deionized water, start stirring, and slowly add ammonium bicarbonate aqueous solution with a concentration of 30%. After 40 minutes of preparation, the pH of the solution is 4.0. Put the prepared solution into an enamel tank and heat to 48°C. After passing through the cerium carbonate filter cake After filtering to remove oil and iron, the filtrate was 2.0m 3 into 10m 3 In the FRP stirring tank, turn on the steam valve, turn on the steam valve, heat the raw material solution to a temperature of 85°C, start stirring, and slowly add a 30% aqueous solution of ammonium bicarbonate as a precipitating agent. During the precipitation process, ensure that the precipitation temperature is between 87-92°C Between, the precipitation time is 170 minutes, and the pH of the precipitation end point is 6.5. After the precipitation is complete, c...

Embodiment 3

[0015] will be 1.5m 3 Rare earth oxide content REO=438g / L cerium nitrate mother liquor into 10m 3 In the FRP stirring tank, add 1.5m 3 Dilute with deionized water, start stirring, and slowly add 30% ammonium bicarbonate aqueous solution. After 40 minutes of preparation, the pH of the solution is 3.5. Put the prepared solution into an enamel tank and heat it to 49 ° C. After passing through the cerium carbonate filter cake After filtering to remove oil and iron, the filtrate was 2.0m 3 into 10m 3 In the FRP stirring tank, open the steam valve, open the steam valve, heat the raw material solution to a temperature of 85°C and then start stirring, slowly add a precipitant 30% ammonium bicarbonate aqueous solution, and during the precipitation process, ensure that the precipitation temperature is between 86-91°C Between, the precipitation time is 175 minutes, and the pH of the precipitation end point is 7.0. After the precipitation is complete, continue to stir for 10 minutes, t...

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PUM

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Abstract

The invention discloses a production method of a low-Cl-oilless cerium carbonate product with large specific gravity, mother liquor in the production of crystal cerium nitrate is taken as a raw material, and 30% ammonium bicarbonate water solution is taken as a precipitant for synthesizing the low-Cl-oilless carbonate product with the large specific gravity. The production method comprises the steps of using the 30% ammonium bicarbonate water solution to remove oil and iron in raw material solution, then controlling the precipitation time and the precipitation temperature, washing for a plurality of times with deionized water for removing non-rare earth impurities, then carrying out hydration in a centrifuge, and obtaining the low-Cl-oilless carbonate product with the large specific gravity, wherein Cl- in the product is not more than 50ppm, and REO is not less than 65%. The use of the production method can effectively treat the problem of treatment of the cerium nitrate mother liquor in the production of the crystal cerium nitrate, and convert the cerium nitrate mother liquor with higher content of impurities into the low-Cl-oilless cerium carbonate product with the large specific gravity with lower content of the impurities and higher purity by high-temperature precipitation after regulating the PH and removing the oil and the iron by using the ammonium bicarbonate water solution.

Description

technical field [0001] The invention belongs to the field of rare earth product manufacturing, in particular to a low Cl - A production method of an oil-free high specific gravity cerium carbonate product. Background technique [0002] In the production process of crystalline cerium nitrate, a large amount of cerium nitrate mother liquor is generated. The initial treatment method is to mix it into the extraction production line as a raw material in proportion; secondly, it is used as a raw material for the production of large specific gravity cerium oxide, and the cost in the production process is relatively high. Contents of the invention [0003] The purpose of this invention is to provide a kind of low Cl with the mother liquor in the production of crystalline cerium nitrate as raw material, simple technique, lower cost, convenient to large-scale production - The production method of oil-free heavy cerium carbonate. [0004] In order to achieve the above object, a kin...

Claims

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Application Information

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IPC IPC(8): C01F17/00
Inventor 韩满璇方中心王旭光刘小江崔菊梅施晓红
Owner 甘肃稀土新材料股份有限公司
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