Production process of high-purity barium oxide

A production process, barium oxide technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of no product production process, high cost, environmental pollution, etc., and achieve convenient impurity removal and roasting, economic benefits Considerable effect of shortening process time

Inactive Publication Date: 2017-05-24
TIANJIN GUANGFU TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, high-purity barium nitrate is calcined at 1000-1200°C for 8-10 hours, and high-purity barium carbonate is calcined at >1200°C for 8 hours. This calcining method will not only release a large amount of nitrogen dioxide and carbon dioxide, but also cause environmental pollution. , and it also seriously corrodes the burning furnace, and mo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A production process of high-purity barium oxide, the steps are as follows:

[0024] (1) Weigh 5kg of industrial grade barium nitrate, add high-purity water to dissolve, heat to 70°C, slowly add 50g of high-purity ammonium carbonate, 50g of high-purity barium hydroxide, stir vigorously, a small amount of precipitation occurs, and heat filter.

[0025] (2) The filtrate is clear and transparent, add 5 drops of concentrated nitric acid, heat and concentrate to saturation, cool and crystallize.

[0026] (3) Repeat the crystallization once again according to the above steps, and dry the crystals to obtain high-purity barium nitrate, about 3.5kg, with a yield of 70%.

[0027] (4) Put 20kg of high-purity water into the reactor, heat and boil for 30 minutes, then add the high-purity barium nitrate obtained in step (3), stir to make a saturated solution.

[0028] (5) Quickly use high-purity ammonia water, adjust the pH to 8, add about 0.5kg of high-purity hydrogen peroxide, sti...

Embodiment 2

[0032] A production process of high-purity barium oxide, the steps are as follows:

[0033] (1) Take 5kg of high-purity barium nitrate, add it to 5kg of high-purity ammonia water (25%) under stirring, make barium hydroxide solution, and filter. The filtrate was quickly closed and cooled.

[0034] (2) Add the above-mentioned barium hydroxide solution into 2 liters of high-purity hydrogen peroxide solution under stirring, and precipitation occurs while adding, until the addition is complete.

[0035] (3) Dry the precipitate and wash it several times with high-purity water until there is no NO 3 - until.

[0036] (4) Dry the precipitate, dry it at 100°C, put it into a burning furnace, and burn it at a controlled temperature of 425°C for 6 hours to obtain 2.93kg of high-purity barium oxide, with a content of 99.97% and a yield of 70%.

Embodiment 3

[0038] A production process of high-purity barium oxide, the steps are as follows:

[0039] (1) Take 2 kg of high-purity barium nitrate, add 2 kg of high-purity ammonia water (25%), make an alkaline solution with pH=8, filter to obtain the filtrate.

[0040] (2) Take 700ml of high-purity hydrogen peroxide and slowly add it into the above-mentioned barium hydroxide filtrate under stirring to generate barium peroxide.

[0041] (3) The precipitate was washed 5 times with high-purity water until there was no NO 3 - Until then, filter.

[0042] (4) After drying the precipitate at 100°C, put it into a muffle furnace and burn it for 8 hours with the temperature controlled at 400°C to obtain 1.06kg of high-purity barium oxide with a content of 99.98% and a yield of 65%.

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PUM

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Abstract

The invention relates to a production process of high-purity barium oxide. The production process comprises the following steps: (1) adjusting the pH value of a barium nitrate saturated solution prepared from high-purity barium nitrate to be 8-9, adding high-purity hydrogen peroxide, and stirring for 5-10 minutes so as to generate a great deal of barium peroxide precipitate; (2) performing spin-dry on the precipitate, and washing for times with high-purity water till no NO3 exists; (3) performing spin-dry roasting. As the raw material of the production process of the high-purity barium oxide is purified in advance, a high-purity standard is met, the product purity is controlled from the raw material, introduction of later feeding reaction impurities can be avoided, and the purity of a final product can be ensured.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry, optical glass and electronic instrument industry, and relates to a production process of high-purity barium oxide. Background technique [0002] High-purity barium oxide is a colorless cubic crystal, soluble in acid, insoluble in acetone and ammonia. High-purity barium oxide is used in the manufacture of black-and-white and color picture tubes and superconducting materials, and is also used in glass and ceramic industries, ingredients for photonic glass, and electronics, instrumentation, and metallurgical industries. [0003] The preparation of high-purity barium oxide generally adopts the calcining method. For example, high-purity barium nitrate is calcined at 1000-1200°C for 8-10 hours, and high-purity barium carbonate is calcined at >1200°C for 8 hours. This calcining method will not only release a large amount of nitrogen dioxide and carbon dioxide, but also cause environmental ...

Claims

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Application Information

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IPC IPC(8): C01F11/02
Inventor 张贵珠张勇
Owner TIANJIN GUANGFU TECH DEV
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