Production technology for electronic grade ammonium cerium nitrate

A technology of cerium ammonium nitrate and production process, which is applied in the field of production technology of electronic grade cerium ammonium nitrate, can solve the problems of low yield, high content of non-rare earth metal impurity ions, low purity of cerium ammonium nitrate and the like, so as to improve production efficiency. Effect

Active Publication Date: 2019-06-25
四川沃耐稀新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a production process for electronic grade ammonium cerium nitrate, which solves the problems of high content of non-rare earth metal impurity ions in the existing ammonium cerium nitrate, low purity of ammonium cerium nitrate, and low yield

Method used

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  • Production technology for electronic grade ammonium cerium nitrate
  • Production technology for electronic grade ammonium cerium nitrate
  • Production technology for electronic grade ammonium cerium nitrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The production technology of electronic grade cerium ammonium nitrate comprises the following steps:

[0040] (1) Add pure water to raw material cerium carbonate, add nitric acid to dissolve and form solution 1, adjust solution 1 to acidity to obtain solution 2, solution 2 is warmed up to 60 DEG C and add hydrogen peroxide, heat preservation reaction 20 minutes; Calculate by weight parts Add 0.8 part of pure water to 1 part of raw material cerium carbonate to form a slurry, add 0.8 part of nitric acid to the slurry to form a solution 1, and adjust the pH to 0.5 to obtain a solution 2; the concentration by weight of the nitric acid is 60%; The ratio of hydrogen peroxide to solution 2 is H 2 o 2 / TREO:0.2%; Fe contained in raw material cerium carbonate 2+ oxidized to Fe 3+ ;

[0041] (2) Add cerium carbonate to adjust the pH value to 2, then adjust the pH value to 4 with ammonium bicarbonate aqueous solution, heat up to 90°C for 35 minutes to obtain a trivalent cerium...

Embodiment 2

[0054] The production technology of electronic grade cerium ammonium nitrate comprises the following steps:

[0055] (1) Add pure water to the raw material cerium carbonate, add nitric acid to dissolve and form solution 1, adjust solution 1 to acidity to obtain solution 2, heat solution 2 to 65° C. and add hydrogen peroxide, and keep warm for 22 minutes; raw material cerium carbonate contains Fe 2+ oxidized to Fe 3+ ; In parts by weight, add 0.9 part of pure water into 1 part of raw material cerium carbonate to form a slurry, add 0.82 part of nitric acid to the slurry to form a solution 1, and adjust the pH to 1.0 to obtain a solution 2; the weight of the nitric acid The percentage concentration is 64%; the ratio of hydrogen peroxide to solution 2 is H 2 o 2 / TREO:0.2%;

[0056] (2) Add cerium carbonate to adjust the pH value to 2.2, then adjust the pH value to 4.2 with ammonium bicarbonate aqueous solution, heat up to 93°C for 30 minutes and obtain a trivalent cerium solu...

Embodiment 3

[0069] The production technology of electronic grade cerium ammonium nitrate comprises the following steps:

[0070](1) Add pure water to raw material cerium carbonate, add nitric acid to dissolve and form solution 1, adjust solution 1 to acidity to obtain solution 2, solution 2 is warmed up to 70 DEG C and add hydrogen peroxide, keep warm for 25 minutes; 1.0 part of pure water is added to 1 part of raw material cerium carbonate to form a slurry, 0.85 part of nitric acid is added to the slurry to form a solution 1, and the pH is adjusted to 1.0 to obtain a solution 2; the concentration by weight of the nitric acid is 68%; The ratio of hydrogen peroxide to solution 2 is H 2 o 2 / TREO:0.2%; Fe contained in raw material cerium carbonate 2+ oxidized to Fe 3+ ;

[0071] (2) Add cerium carbonate to adjust the pH value to 2.5, then adjust the pH value to 4.5 with ammonium bicarbonate aqueous solution, heat up to 95°C for 25 minutes and obtain a trivalent cerium solution; Fe 3+ H...

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Abstract

The invention provides a production technology for electronic grade cerium ammonium nitrate, and belongs to the field of chemical product manufacturing. The technology comprises the following steps: (1) dissolving a raw material cerium carbonate to form a solution 1, adjusting the solution 1 to be acidic in order to obtain a solution 2, and carrying out a heat insulation reaction for 20-25 min; (2) further adding cesium carbonate to reversely adjust the pH value, and then adjusting the pH value with an aqueous solution of ammonium hydrogen carbonate to obtain a trivalent cerium solution; (3) filtering the trivalent cerium solution obtained in step (2) to obtain a purified filtrate; (4) heating the filtrate obtained in step (3) to carry out evaporative concentration in order to obtain a concentrate; (5) carrying out cooling crystallization on the concentrate obtained in step (4), carrying out centrifugal dehydration to obtain cerium nitrate crystals, and recrystallizing the cerium nitrate crystals; (6) dissolving the high-purity cerium nitrate crystals obtained in step (5); and (7) carrying out oxidative precipitation, plate and frame filtration, dissolution, filtration, evaporatingcrystallization, centrifugal dehydration and packaging on a cerium nitrate solution obtained in step (6) to obtain the electronic grade cerium ammonium nitrate product. The yield is higher than 98%,the ratio of CeO2 / TREO is equal to or more than 99.995%, and the content of metal impurity ions is less than 200 ppb.

Description

technical field [0001] The invention relates to the technical field of chemical product manufacturing, in particular to a production process of electronic grade cerium ammonium nitrate. Background technique [0002] Rare earth elements are known as "industrial vitamins" and have irreplaceable excellent magnetic, optical, and electrical properties, which play a huge role in improving product performance, increasing product varieties, and increasing production efficiency. Because rare earth has great effect and low dosage, it has become an important element to improve product structure, increase technological content, and promote technological progress in the industry. It is widely used in aerospace, military, electronics, metallurgy, petrochemical, glass ceramics, medicine, agriculture and other new industries. material field. [0003] Cerium is the most abundant element in light rare earth ores, and its application fields are very wide. Most of the rare earth application fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 杨青
Owner 四川沃耐稀新材料科技有限公司
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