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Production method for high-purity electronic-grade barium carbonate

A production method, barium carbonate technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, etc., can solve the problems of large amount of dispersant, complex production process, low dispersibility, etc., achieve shortened production time, simple production process, Fully dissolved effect

Inactive Publication Date: 2013-11-27
SHANDONG YINBEI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of producing high-purity barium carbonate is to react barium chloride and ammonium bicarbonate. The reaction raw materials are liquid, the production process is complex, there are many by-products, and the specific surface area is 1-10m 2 / g, small specific surface area, low dispersion
Moreover, the current amount of dispersant is relatively large, for example: the amount of N-acyl ED3A is generally 4% of the total solution, and the production cost is high

Method used

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  • Production method for high-purity electronic-grade barium carbonate
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  • Production method for high-purity electronic-grade barium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Dissolve 75kg of barium hydroxide in 1200kg of deionized water at 30°C, add 300kg of deionized water to form a barium hydroxide solution, raise the temperature of the solution to 50°C while stirring, and add 1.0‰ to the barium hydroxide solution dispersant polyacrylamide, ultrasonic treatment for 10min, continue to stir and stir at a constant temperature of 50°C for 10min; in a closed container, 20kg of carbon dioxide gas is passed into the barium hydroxide solution through a disc microporous aerator while stirring , stop stirring after the reaction is over, and then pass in carbon dioxide at a rate of 0.2-1.0kg / min, stop the ventilation when the pH value of the solution is detected to be 6; heat the slurry to complete boiling within 45 minutes, and keep boiling for 10 minutes, then stop heating; , when the temperature of the slurry drops to 75°C, precipitate and filter, and then use an atmospheric pressure microwave dryer to dry and grind and sieve to obtain high-purity...

Embodiment 2

[0022] Dissolve 250kg of barium hydroxide in 2300kg of deionized water at 40°C, add 700kg of deionized water to form a barium hydroxide solution, raise the temperature of the solution to 60°C while stirring, and add 2.5‰ to the barium hydroxide solution The dispersant polyacrylamide, ultrasonic treatment for 30min, continue to stir and stir at a constant temperature of 60°C for 20min; under the stirring state, pass 55kg of carbon dioxide gas into the barium hydroxide solution through the disc microporous aerator, After the reaction, stop stirring; then pass in carbon dioxide at a rate of 0.2-1.0kg / min, and stop the ventilation when the pH value of the solution is 6.5; within 45 minutes, heat the slurry to complete boiling, and keep boiling for 20 minutes, then stop heating; When the temperature of the slurry drops to 20°C, precipitate and filter, and after filtering, use a vacuum microwave dryer to dry and grind and sieve to obtain high-purity electronic-grade barium carbonate....

Embodiment 3

[0025] Dissolve 570kg of barium hydroxide in 3000kg of deionized water at 50°C, add 1000kg of deionized water to form a barium hydroxide solution, heat the solution to 80°C while stirring, and add 5‰ to the barium hydroxide solution The dispersant polyacrylamide is ultrasonically treated for 60 minutes, and the stirring is continued at a constant temperature of 80°C for 30 minutes; while stirring, 95kg of carbon dioxide gas is passed into the barium hydroxide solution through a disc microporous aerator, and the reaction After the end, stop stirring; then pass in carbon dioxide at a rate of 0.2 ~ 1.0kg / min, check the pH value of the solution to 7 and stop aeration; heat the barium hydroxide solution to 50°C, stir for 60 minutes in a closed state, and then carry out precipitation and filtration. The high-purity electronic-grade barium carbonate is obtained after being dried with a freeze dryer and ground and sieved.

[0026] After testing, the purity is 99.95%, such as figure ...

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Abstract

The invention relates to a production method for high-purity electronic-grade barium carbonate. The production method comprises the following steps: adding barium hydroxide into deionized water, heating the barium hydroxide in the stirring process and preparing into a barium hydroxide solution; adding polyacrylamide into the barium hydroxide solution and introducing carbon dioxide into the barium hydroxide solution by using a disc type microporous aerator; heating the barium hydroxide solution until the barium hydroxide solution is boiled; cooling and filtering the precipitate to obtain the barium carbonate precipitate; and drying the barium carbonate precipitate in a microwave dryer to obtain the high-purity electronic-grade barium carbonate. The polyacrylamide serves as a dispersing agent and has a good dispersing effect, so the production cost is reduced. The carbon dioxide is introduced by the disc type microporous aerator and is mixed with the barium hydroxide completely and uniformly, so the specific area of the produced barium carbonate is large, the production time is shortened, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a production method of barium carbonate, in particular to a production method of high-purity electronic grade barium carbonate. Background technique [0002] High-purity barium carbonate is one of the important raw materials for producing precision high-grade electronic components. At present, the method of producing high-purity barium carbonate is to react barium chloride and ammonium bicarbonate. The reaction raw materials are liquid, the production process is complicated, there are many by-products, and the specific surface area is 1-10m 2 / g, the specific surface area is small, and the dispersion is not high. Moreover, the current amount of dispersant is relatively large, for example, the amount of N-acyl ED3A is generally 4% of the total solution, and the production cost is high. Contents of the invention [0003] The purpose of the present invention is to provide a production method of high-purity electronic grade bar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18B82Y40/00
Inventor 古梦菲
Owner SHANDONG YINBEI TECH