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Preparation process and preparation device of lead bismuth alloy for nuclear reactor

A lead-bismuth alloy and nuclear reactor technology is applied in the field of metal material processing, which can solve the problems of high equipment configuration requirements, increased oxidation, and need for mechanical stirring, and achieves the effects of reducing oxygen content, inhibiting volatilization, and accelerating crystallization speed.

Inactive Publication Date: 2018-01-12
HUNAN JINWANG BISMUTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses metal powder as raw material, which increases the risk of oxidation during the grinding process, and requires mechanical stirring, which requires high equipment configuration.

Method used

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  • Preparation process and preparation device of lead bismuth alloy for nuclear reactor
  • Preparation process and preparation device of lead bismuth alloy for nuclear reactor

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Embodiment

[0022] A preparation process for a nuclear reactor lead-bismuth alloy, comprising the steps of:

[0023] 1) The lead and bismuth ingots are batched according to the designed composition, and put into the crucible of the intermediate frequency induction furnace; the lead ingots used are national standard lead ingots, and the bismuth ingots used are low-silver, low-lead, high-purity bismuth ingots, and silver and lead impurities are The content is less than 250ppm;

[0024] 2) Turn on the nitrogen protection device to purge the crucible and ingredients in the furnace together, the nitrogen pressure is about 0.01-0.1Mpa; the mass percentage of the nitrogen purity is 99.99-99.999%;

[0025] 3) When the gas supply of the nitrogen protection device is uninterrupted, start the intermediate frequency induction furnace, start to heat up, and keep the melting temperature at 400-500°C. After the alloy is completely melted, increase the frequency of the intermediate frequency furnace, and...

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Abstract

The invention provides a preparation process and a preparation device of a lead bismuth alloy for a nuclear reactor. The preparation process comprises the following steps: 1) preparing raw materials;2) blowing a crucible and materials inside a furnace with nitrogen; 3) with a nitrogen protection device, powering on a medium-frequency sensing furnace to melt an alloy; and 4) casting by using a lead bismuth alloy casting mold. The preparation device comprises the medium-frequency sensing furnace and the lead bismuth alloy casting mold, wherein a water cooling jacket is arranged outside the leadbismuth alloy casting mold; a coil heating device is arranged at a casting hole; and a hydraulic rod is arranged at the casting hole, so that the stability of the crystallization process after casting is ensured, and the lead bismuth alloy is prevented from segregation. Equipment used in the preparation process is simple in structure, and no vacuum smelting or vacuum casting is needed.

Description

technical field [0001] The invention belongs to the field of metal material processing, and in particular relates to a preparation process and a preparation device of a lead-bismuth alloy for nuclear reactors. Background technique [0002] Lead-bismuth alloy is an alloy used in the cooling system of nuclear reactors. In addition to strict requirements on impurities, the alloy phase must not have segregation, and the alloy ingot must not have shrinkage cavities. [0003] On August 25, 2011, the Chinese Invention Patent Application Publication No. CN102304632A disclosed a method for preparing a lead-bismuth alloy for nuclear reactors, using vacuum induction melting. 1) Put the raw material lead in a crucible in a glove box and heat it to 450 ~800℃, pass high-purity hydrogen for pretreatment; 2) Crucible for passivation treatment; 3) Load according to the design composition, lead cold is loaded in the crucible, bismuth is loaded in the hopper; 4) Vacuum degree 0.1~10Pa Filled w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C11/08G21C3/07
CPCY02E30/30
Inventor 肖辉
Owner HUNAN JINWANG BISMUTH
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