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Preparation method of SIC-based composite phase ceramic solidified body for radioactive graphite solidified treatment

A technology of solidification treatment and composite ceramics, which is applied in the fields of radioactive purification and nuclear engineering, which can solve the problems of poor compactness of solidified bodies and expensive disposal costs, and achieve excellent radiation resistance, small absorption cross-section, and excellent high-temperature mechanical properties. Effect

Inactive Publication Date: 2020-10-16
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, for the solidification treatment of high-radioactive graphite, self-propagating TiC-Al 2 o 3 A lot of research has been done on solidifying high-radioactive graphite based on ceramics, but this method has waste gas (CO, CO 2 etc.), the compactness of the solidified body is poor, there are more unreacted graphite and by-products, and the performance of the solidified body needs to be improved, especially the volume ratio of the solidified body is very large (theoretically, the solidified body is 10.6 times the weight of graphite, and it can actually reach more than 20 times), the disposal cost is extremely expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Silicon powder, graphite, MgO, Al(OH) 3 As raw material, the formula is MgO: Al(OH) 3 =1:2 (molar ratio), Si:C=1.05:1 (molar ratio), 0.8(Si+C)-0.2MgAl 2 o 4 (The molar ratio of). First weigh MgO, Al(OH) 3 , select material: ball: absolute ethanol is 1:3:1.2 (mass ratio), use planetary mill ball mill for 5 hours, dry (temperature 80°C, time 12 hours), calcining temperature in high temperature muffle furnace is 1400°C , holding for 4 hours to obtain MgAl 2 o 4 . Weigh silicon powder and graphite powder again, select material: ball: dehydrated alcohol is 1: 3: 2 (mass ratio), adopt planetary mill ball mill for 5 hours, vacuum dry (first temperature 50 ℃, time 10 hours; 108°C for 5 hours). Final weighing of MgAl 2 o 4 and a mixture of Si and C, select materials: balls: absolute ethanol as 1:3:2 (mass ratio), use planetary mill ball mill for 6 minutes, and vacuum dry (first temperature 50 ° C, time 10 hours; then temperature 101 ° C , time 5 hours), in a vacuum f...

Embodiment 2

[0033] Silicon powder, graphite, MgO, Al(OH) 3 As raw material, the formula is MgO: Al(OH) 3 =1:2 (molar ratio), Si:C=1.2:1 (molar ratio), 0.8(Si+C)-0.2MgAl 2 o 4 (The molar ratio of). First weigh MgO, Al(OH) 3 , select material: ball: absolute ethanol is 1:3:1.2 (mass ratio), use planetary mill ball mill for 5 hours, dry (temperature 80°C, time 12 hours), calcining temperature in high temperature muffle furnace is 1400°C , holding for 4 hours to obtain MgAl 2 o 4 . Weigh silicon powder and graphite powder again, select material: ball: dehydrated alcohol is 1: 3: 2 (mass ratio), adopt planetary mill ball mill for 5 hours, vacuum dry (first temperature 50 ℃, time 10 hours; 108°C for 5 hours). Final weighing of MgAl 2 o 4 and a mixture of Si and C, select materials: balls: absolute ethanol as 1:3:2 (mass ratio), use planetary mill ball mill for 6 minutes, and vacuum dry (first temperature 50 ° C, time 10 hours; then temperature 101 ° C , time 5 hours), in a vacuum fu...

Embodiment 3

[0035] Silicon powder, graphite, MgO, Al(OH) 3 As raw material, the formula is MgO: Al(OH) 3 =1:2 (molar ratio), Si:C=1.05:1 (molar ratio), 0.9(Si+C)-0.1MgAl 2 o 4 (The molar ratio of). First weigh MgO, Al(OH) 3 , select material: ball: absolute ethanol is 1:3:1.2 (mass ratio), use planetary mill ball mill for 5 hours, dry (temperature 80°C, time 12 hours), calcining temperature in high temperature muffle furnace is 1400°C , holding for 4 hours to obtain MgAl 2 o 4 . Weigh silicon powder and graphite powder again, select material: ball: dehydrated alcohol is 1: 3: 2 (mass ratio), adopt planetary mill ball mill for 5 hours, vacuum dry (first temperature 50 ℃, time 10 hours; 108°C for 5 hours). Final weighing of MgAl 2 o 4 and a mixture of Si and C, select materials: balls: absolute ethanol as 1:3:2 (mass ratio), use planetary mill ball mill for 6 minutes, and vacuum dry (first temperature 50 ° C, time 10 hours; then temperature 101 ° C , time 5 hours), in a vacuum f...

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Abstract

The invention discloses a preparation method of a SiC-based multi-phase ceramic solidified body used for radioactive graphite solidification treatment, and the preparation method is characterized by comprising the following steps: using silicon powder, graphite powder, MgO and Al (OH) 3 as raw materials, preparing MgAl2O4 powder, preparing Si-C powder, preparing SiC-MgAl2O4 multi-phase powder, adding polyvinyl alcohol, performing sol-granulating, shaping and glue discharging, vacuum hot-pressing sintering and the like to obtain the SiC-based multi-phase ceramic solidified body at low temperature. The SiC-based multi-phase ceramic solidified body with excellent anti-radiation stability, chemical stability, mechanical stability and thermal stability is prepared from the safe and cheap raw materials by a simple and practical vacuum hot-pressing sintering technique at the low temperature. The prepared SiC-based multi-phase ceramic solidified body is particularly suitable for the ceramic solidification treatment of high-radioactive activity graphite waste.

Description

technical field [0001] The invention belongs to the solidification treatment of radioactive waste, and relates to a preparation method of a SiC-based composite ceramic solidified body used for solidification treatment of radioactive graphite. The SiC-based multiphase ceramic solidified body prepared by the invention is particularly suitable for ceramic solidification treatment of graphite waste with high radioactive activity. Background technique [0002] With the increase in energy demand and the improvement of environmental protection awareness, nuclear energy is still the preferred energy source in terms of resources, economy, and safety, but the radioactive waste generated restricts the sustainable development of nuclear energy. Therefore, how to safely and effectively dispose of radioactive waste is a domestic issue. external problems. Graphite is widely used in nuclear reactors as neutron moderators, reflective layer materials, and nuclear fuel sleeves. Due to the dec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/575G21F9/30
CPCC04B35/575C04B2235/3222C04B2235/425G21F9/304
Inventor 滕元成王庆李玉香吴浪赵骁锋蔡鑫胡壮
Owner SOUTHWEAT UNIV OF SCI & TECH
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