Starting method for cold-crucible vitrification treatment of radioactive liquid waste

A technology of radioactive waste liquid and glass solidification, which is used in radioactive purification, nuclear engineering and other directions to achieve the effect of simple start-up process, no radioactive leakage and improved safety.

Active Publication Date: 2017-06-30
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vitrification treatment of radioactive waste, especially the vitrification treatment of high-level waste liquid, is carried out in a hot chamber with remote operation, and the upper part of the crucible furnace cover is equipped with feeding devices, stirring devices, thermocouples, etc., without excessive The space is used for more complex startup operations

Method used

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  • Starting method for cold-crucible vitrification treatment of radioactive liquid waste
  • Starting method for cold-crucible vitrification treatment of radioactive liquid waste

Examples

Experimental program
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Effect test

Embodiment 1

[0035] First, the starting glass 4 is put into the cold crucible 1 of Φ300mm, and the starting glass 4 added is the starting glass 4 whose resistivity should be 1-10Ωcm at 1100-1200°C. The height of adding start glass 4 is 1 / 3 position of induction coil 2. Then put into the graphite ring 3 of 40g, Φ150mm; then put into the starting glass 4 to cover the graphite ring 3, as figure 1 As shown, the starting glass 4 added to cover the graphite ring 3 has a thickness of 1 cm; the frequency of the high-frequency power supply of the cold crucible 1 is adjusted to the starting frequency of the graphite ring 3-start with a power of 30kW, and then increase by 5kW every ten minutes until 70kW; the graphite ring 3 is gradually heated until it burns, and after the graphite ring 3 starts to burn, the 6m 3 Oxygen is introduced into the cold crucible 1 at a rate of / h, and the graphite burns to release a large amount of heat to melt the surrounding glass. After about 30 minutes, the graphite...

Embodiment 2

[0037] This embodiment is the same as Embodiment 1, and the difference is that firstly, after putting the starting glass 4 into the Φ300mm cold crucible 1, the height of the starting glass 4 is 3 / 4 of the position of the induction coil 2, and the 40g, Φ225mm Graphite sheet, the whole process took about 2h.

Embodiment 3

[0039] This embodiment is the same as Embodiment 1, and the difference is that firstly, after putting the starting glass 4 into the Φ300mm cold crucible 1, the height of adding the starting glass 4 is 3 / 5 of the position of the induction coil 2, and the whole process takes about 1h.

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Abstract

The invention discloses a starting method for cold-crucible vitrification treatment of radioactive liquid waste. The starting method mainly comprises the following steps: (1) adding starting glass to a cold crucible and then placing a starting material on the starting glass; (2) putting the starting glass on the starting material again; (3) turning on a high frequency power source of the cold crucible, adjusting the frequency to a frequency of starting the starting material, and gradually increasing the frequency such that the starting material is gradually heated until the starting material is burnt; (4) bubbling oxygen into the cold crucible and stopping bubbling the oxygen until the starting material is burnt out; and (5) adjusting the frequency of the high frequency power supply to a starting glass melting frequency, continuing to increase the power of the high-frequency power source until the added starting glass is fully melted. The invention provides a starting method for cold-crucible vitrification treatment of radioactive liquid waste which is simple, efficient, easy to operate, free of radioactive leakage, and does not influence the quality of the vitrified product.

Description

technical field [0001] The invention belongs to the technical field of radioactive waste treatment, and in particular relates to a starting method for vitrification treatment of cold crucible of radioactive waste liquid. Background technique [0002] Cold crucible vitrification technology is a glass melting technology transplanted from the industrial pyrometallurgy industry. It uses high frequency (10 5 ~10 6 Hz) induction heating, the water-cooled crucible is composed of several arc-shaped blocks or tubes, and cooling water is passed through the arc-shaped blocks or tubes. The cold wall is kept, and the gaps between each arc-shaped block or tube are filled with refractory materials, which are insulated from each other and do not form a loop. This split structure is to reduce the shielding of the crucible to the electromagnetic field. A water-cooled spiral induction coil is wound around the crucible, and the induction coil is connected to a power source to generate an alte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/06G21F9/14
CPCG21F9/06G21F9/14
Inventor 刘丽君郄东生李扬李宝军朱冬冬周慧张华陈楠
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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