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Metod and installation for the treatment of a radioactive wastes

A radioactive waste, reactive technology, used in radioactive purification, nuclear engineering, etc.

Inactive Publication Date: 2005-02-23
弗拉迪米尔·阿森诺夫·弗拉基米罗夫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of this method is that the obtained radioactive waste contains 15-20g / l non-radioactive boric acid and can exist for a long time

Method used

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  • Metod and installation for the treatment of a radioactive wastes

Examples

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Effect test

Embodiment 1

[0057]1 liter of radioactive waste having a pH of 8.0 and containing 35 g / l of boric acid (boron-containing salts) was mixed with radioactive waste having a pH of 10.1 until the pH of the mixture was 9.1. The hard crystalline phase of borax was then separated off, and 9.0 ml of a calcium borate solution having a concentration of 900 g / l was added to the remaining portion of the liquid radioactive waste. The thus obtained insoluble calcium borate was separated from the mixture and the liquid radioactive waste was concentrated until the concentration of boric acid in the waste was 2.2 g / l. The separated calcium borate was washed several times with water and isolated as a radioactive product. A solution with a concentration of 20 g / l was prepared from the isolated and recrystallized borax and subjected to electrodialysis. A heat resistant membrane and a current of 0.35 amps and a voltage of 5.2 volts were used in the electrodialysis unit. The products obtained were: boric acid ...

Embodiment 2

[0059] 1 liter of radioactive waste having a pH of 10.0 and containing 200 g / l of boric acid (boron-containing salts) was mixed with radioactive waste having a pH of 4.0 until the pH of the mixture was 8.2. After the borax had separated as a hard crystalline phase, 9.4 ml of a 500 g / l magnesium chloride solution was added to the residual liquid radioactive waste. The resulting dissolved magnesium borate was then separated from the mixture and the liquid radioactive waste was concentrated to 3.4 g / l of boric acid.

[0060] The isolated borax was recrystallized and a solution of 25 g / l concentration was prepared from the refined borax and treated with an electrodialysis unit using a heat-resistant membrane and a current of 45 amperes and a voltage of 55 volts. The products obtained were: a boric acid solution with a concentration of 59 g / l and a sodium hydroxide solution with a concentration of 150 g / l.

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Abstract

This invention concerns a method and an installation for the treatment of radioactive wastes produced as a consequence of the operation of nuclear power plants with pressurized water reactors and boron reactivity regulation and will take place for the production of substances like borax with environmentally allowed content of radioactive isotopes that contains only the cesium isotopes with maximum total concentration of 800 Bq in one kilogram of borax; calcium, magnesium or calcium-magnesium borates with environmentally allowed content of radioactive isotopes; boron acid solution with environmentally allowed content of radioactive isotopes; sodium hydroxide solution containing only the cesium isotopes with maximum total concentration of 800 Bq in one kilogram sodium hydroxide; radioactive waste containing under 5 g / l of boron acid.

Description

technical field [0001] The present invention relates to a method and apparatus for the treatment of radioactive wastes arising from the operation of nuclear power plants with pressurized water reactors and reactivity regulation of boron, for the purpose of preparing solutions such as borax, calcium magnesium borate, boric acid and sodium hydroxide and other products in which the content of radioactive isotopes is suitable for a variety of applications and for comprehensive environmental protection. Background of the invention [0002] The known method of treating radioactive wastewater (BG 32683) is to first convert it to a very dry salt and then treat it with a longer carbon chain alcohol. The boric acid and the alcohol are first esterified when the boric acid-containing salt is treated with the alcohol. The ester thus obtained is subjected to high temperature (above 100°C) distillation until boronic acid is formed. [0003] The main disadvantage of this method is that al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/06G21F9/10
CPCG21F9/06
Inventor 弗拉迪米尔·阿森诺夫·弗拉基米罗夫
Owner 弗拉迪米尔·阿森诺夫·弗拉基米罗夫
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