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Sodium purifying process and purification system thereof

A technology of purification process and purification system, which is applied in the field of nuclear grade sodium purification process and its purification system for reactors, and can solve the problems of removal and difficulty in applying industrial scale

Inactive Publication Date: 2005-03-16
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology is mainly to remove calcium from industrial sodium. The system is simple and cannot effectively remove other impurities in industrial sodium to meet the standard of nuclear grade sodium.
Moreover, the technology provided in this document can only be used in the experimental research stage, and it is difficult to apply it on an industrial scale

Method used

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  • Sodium purifying process and purification system thereof
  • Sodium purifying process and purification system thereof
  • Sodium purifying process and purification system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of sodium purification process, its technological process is:

[0040] Step 1 Calcium removal reaction

[0041] The reaction reagent Na with an OAC coefficient of 1.4 2 o 2 Add it into the decalcification reactor 1, then press into the industrial sodium to be treated from the sodium receiving tank 7, stir, and maintain the reaction temperature at 350°C for 28 hours.

[0042] Step 2 Primary Settlement

[0043] When the reacted sodium was cooled to 200° C., the valve was opened to enter the primary settler 2 to settle impurities for 45 hours. The low temperature of 140°C is maintained at the bottom of the primary settler 2, and the temperature difference between the upper part and the bottom of the primary settler 2 is maintained.

[0044] Step 3 primary filter

[0045] The precipitated sodium was passed through the wire-filled cold trap 3 at 140° C., and filtered.

[0046] Step 4 Secondary Settlement

[0047] The sodium passing through the screen-filled cold ...

Embodiment 2

[0062] A kind of sodium purification process, its technological process is:

[0063] Step 1 Calcium removal reaction

[0064] The reaction reagent Na with an OAC coefficient of 1.2 2 o 2 Add it into the decalcification reactor 1, then press into the industrial sodium to be treated from the sodium receiving tank 7, stir, and maintain the reaction temperature at 300°C for 15 hours.

[0065] Step 2 Primary Settlement

[0066] When the reacted sodium was cooled to 190° C., the valve was opened to enter the primary settler 2 to settle impurities for 40 hours. The low temperature of 130° C. is maintained at the bottom of the first-stage settler 2, and the temperature of the upper part is kept higher than that of the lower part.

[0067] Step 3 primary filter

[0068] The precipitated sodium was passed through the wire-filled cold trap 3 at 135° C., and filtered.

[0069] Step 4 Secondary Settlement

[0070] The sodium passing through the screen-filled cold trap 3 enters the s...

Embodiment 3

[0083] A kind of sodium purification process, its technological process is:

[0084] Step 1 Calcium removal reaction

[0085] The reaction reagent Na with an OAC coefficient of 1.5 2 o 2 Put it into the decalcification reactor 1, then press into the industrial sodium to be treated from the sodium receiving tank 7, stir, and maintain the reaction temperature at 360°C for 30 hours.

[0086] Step 2 Primary Settlement

[0087] When the reacted sodium was cooled to 210° C., the valve was opened to enter the primary settler 2 to settle impurities for 50 hours. The low temperature of 150° C. is maintained at the bottom of the first-stage settler 2 , and the temperature difference between the upper part and the lower part of the first-stage settler 2 is maintained.

[0088] Step 3 primary filter

[0089] The settled sodium was filtered by passing through the wire-filled cold trap 3 at 145°C.

[0090] Step 4 Secondary Settlement

[0091] The sodium passing through the screen-fil...

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Abstract

The invention belongs to alkali metals refinement field, more specificly it relates to the nucleus-grade sodium refinement process and its refinement system for reactor. The process comprises calcium reaction, two stage precipitation and two stage filtering. The refinement system mainly comprises sodium receiving tank, calcium removing reactor, first stage precipitator, first stage filter, second stage precipitator, second stage filter, sodium storage tank and spare cold trap purging loop. The refinement process can make calcium content reduce to below 0.001% from 0.045% of industrial sodium, oxygen content reduce to below 0.003% from 0.025%.

Description

technical field [0001] The invention belongs to the field of purification of alkali metals, and in particular relates to a purification process of nuclear-grade sodium for reactors and a purification system thereof. Background technique [0002] There are a large number of non-metallic impurities such as oxygen, carbon, hydrogen, nitrogen, and metal impurities such as calcium, magnesium, iron, and manganese in industrial sodium. Forms a precipitate in non-nuclear systems. The accumulation of these deposits will hinder the normal flow of coolant and affect the normal operation of the device. Therefore, industrial sodium must be purified to remove impurities such as calcium, oxygen, hydrogen, and carbon in sodium to meet the needs of the reactor. [0003] Baklushin, -R.P. of the former Soviet Union reported the purification of sodium in the primary loop and secondary loop of the fast reactor on Atomnaya-Ehnergiya-USSR.(Mar 1978).v 44(3)p.224-228. However, the purification p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/10
Inventor 邢朝青禹春利谢淳
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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