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Neutron absorption ball preparation method

A technology of absorbing balls and neutrons, applied in the field of nuclear reactors, to achieve the effects of easy cracking and discharge, high purity of PVA, and low equipment investment

Active Publication Date: 2012-11-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a new preparation method of neutron absorbing spheres, to solve the above-mentioned problems existing in the prior art, and to solve the technical problems of large-scale industrial production of spherical graphite products

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0030] Weigh 55Kg of natural graphite, 20Kg of carbon black, and 25Kg of boron carbide. A mixed aqueous solution of PVA and PEG is prepared, the concentration of the mixed aqueous solution is 10 wt%, wherein the mass ratio of PVA:PEG is 4:1. Add the weighed powder into the mixed aqueous solution, the mass ratio is 2:3, knead in the kneader for 1 hour, the kneading temperature is 80°C, then add 2Kg of boric acid, continue kneading for 3 hours, and make it available for extrusion molding of paste. Put the obtained paste into an SL65B extrusion molding machine for pre-compression, pressurize at 350MPa, and hold the pressure for 5 minutes. After pre-compression, a rod with a diameter of 10.5 mm is extruded on the extruder, and the extrusion pressure is 300 MPa. The bar is carbonized under the protection of nitrogen, the temperature is raised to 800°C at 4°C per minute, kept for 4 hours, and the temperature is naturally lowered. Bar stock is cut into small columns that are appro...

Embodiment 2

[0032] Weigh 55Kg of natural graphite, 30Kg of carbon black, and 15Kg of boron carbide. A mixed aqueous solution of PVA and PEG is prepared, the concentration of the mixed aqueous solution is 10 wt%, wherein the mass ratio of PVA:PEG is 4:1. Add the weighed powder into the mixed aqueous solution, the mass ratio is 2:3, knead in the kneader for 1 hour, the kneading temperature is 60°C, then add 2Kg of boric acid, continue kneading for 2 hours, and make it available for extrusion molding of paste. Put the obtained paste into an SL65B extrusion molding machine for pre-compression, pressurize at 350MPa, and hold the pressure for 5 minutes. After pre-compression, a rod with a diameter of 10.5 mm is extruded on the extruder, and the extrusion pressure is 300 MPa. The bar is carbonized under the protection of argon, the temperature is raised to 1000°C at a rate of 3°C per minute, the temperature is kept for 3.5 hours, and the temperature is naturally lowered. Bar stock is cut into...

Embodiment 3

[0034] Weigh 50Kg of natural graphite, 25Kg of carbon black, and 25Kg of boron carbide. A mixed aqueous solution of PVA and PEG is prepared, the concentration of the mixed aqueous solution is 8wt%, wherein the mass ratio of PVA:PEG is 4:1. Add the weighed powder into the mixed aqueous solution, the mass ratio is 1:1, knead in the kneader for 1 hour, the kneading temperature is 20 ° C, then add 1.5Kg of boric acid, continue kneading for 2 hours, and make it available for extrusion Shaped paste. Put the obtained paste into an SL65B extrusion molding machine for pre-compression, pressurize at 300MPa, and hold the pressure for 8 minutes. After pre-compression, a rod with a diameter of 6.5 mm is extruded on the extruder, and the extrusion pressure is 250 MPa. The bar is carbonized under the protection of nitrogen, the temperature is raised to 900°C at a rate of 3°C per minute, the temperature is kept for 3 hours, and the temperature is naturally lowered. Bar stock is cut into sm...

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Abstract

The invention relates to a neutron absorption ball preparation method which includes the following steps: the carbon material and neutron absorption material are mixed to form powder material, the powder material is added to the mixed water solution of PVA and PEG under stirring state, boric acid is added to the solution during kneading process to prepare the thickener; the neutron absorption ball is prepared after pre-pressing, extrusion forming, carbonization, cutting, grinding, high temperature treatment and surface packaging treatment. The invention adopts PVA as bonding agent, is environment-friendly and has low price. The extrusion forming technique has high efficiency, low equipment investment and meets the large-scale industrial production requirement.

Description

technical field [0001] The invention belongs to the field of nuclear reactors, in particular to an extrusion molding preparation method of a neutron absorbing ball. Background technique [0002] As a clean, safe and environmentally friendly energy source, nuclear power generation is of great significance to alleviating the energy security of the world and various countries and global climate change. Despite the setbacks caused by accidents at the Three Mile Island in the United States and the Chernobyl nuclear power plant in the former Soviet Union, people are still actively developing safer and more economical nuclear power generation technologies. At present, the third-generation nuclear power technology has basically matured. [0003] In the fourth-generation nuclear energy system under development, the high-temperature gas-cooled reactor can achieve a very high outlet temperature, has high power generation efficiency and high-grade heat supply capacity, and has attracte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C7/24G21C7/10C01B31/04
CPCY02E30/39Y02E30/30
Inventor 林旭平马景陶陈凤黄志勇邓长生谭威
Owner TSINGHUA UNIV
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