Thermal neutron shielding performance and mechanism of boron rich - - PowerPoint PPT Presentation

a Department of Resource and Environment, School of Metallurgy, Northeastern University, China b Liaoning Provincial Key Laboratory of Metallurgical Resources Recycling Science c Liaoning Key Laboratory for Ecologically Comprehensive Utilization of Boron Resources and Materials d Engineering and Technology Research Center for Boron Resource Comprehensive Development

and Application of Liaoning Province

• Mr. Mengge DONG a and Prof. Xiangxin XUE a, b, c, d

15 JUNE 2018, Naxos, Greece

Thermal neutron shielding performance and mechanism

• f boron rich slag as low cost shielding material

6th International Conference on Sustainable Solid Waste Management

Distribution of boron resources

Reference: An, J., Xue, X.X. J. Clean. Prod. 66, 121–127 (2014)

Turkey American Russia China (4) Chile Peru Argentina Bolivia … . 0.38 billion tons (2016, B2O3)

Distribution of boron resources in China

Reference: An, J., Xue, X.X. J. Clean. Prod. 66, 121–127 (2014)

Brine Qinghai province Szaibelyite Liaoning province Ludwigite (Abundant, 58.4％) Liaoning province

Boron reserves of China： 75％ in Liaoning province , and 25％ in other provinces Main utilization boron resource: Ludwigite

Source of boron rich slag

References： An, J. et al. J. Clean. Prod. 66, 121–127 (2014)

• T. Jiang et al. Advanced Powder Technology, 23 (2012) 406-413.

Z.F. Li et al. Atomic Energy Science and Technology, 45 (2011) 223-229 (In Chinese)

Ludwigite Pretreatment Blast furnace Pig iron Boron rich slag (Blast furnace slag )

Utilization methods for boron rich slag

References: An, J. et al. J. Clean. Prod. 66, 121–127 (2014) Xue X.X. et al, Journal of Northeastern University (Natural science) 36 (2015) 786-789 (In Chinese)

• T. Jiang, et al. Advanced Powder Technology, 23 (2012) 406-413.

Boron element recycling (Products: Borax and boron acid) e.g. Alkaline leaching method under ordinary pressure Functional ceramic powders was prepared using the slag directly. e.g. α′-Sialon-AlN-BN powders, BN/(Ca,Mg)α‘-Sialon, BN-

MgAlON

Utilization methods for boron rich slag

Boron element recycling (Products: Borax and boron acid) e.g. Alkaline leaching method under ordinary pressure Functional ceramic powders was prepared using the slag directly. e.g. α′-Sialon-AlN-BN powders 、BN/(Ca,Mg)α‘-Sialon、BN-

MgAlON

Pollutants emission It cannot be fully utilized

References: An, J. et al. J. Clean. Prod. 66, 121–127 (2014) Xue X.X. et al, Journal of Northeastern University (Natural science) 36 (2015) 786-789 (In Chinese)

• T. Jiang, et al. Advanced Powder Technology, 23 (2012) 406-413.

Fully comprehensive utilization method is needed

Reasons for shielding neutron

Boron element (micro cross section (767 barn), and B-10 isotope (3835 barn)) is excellent for shielding thermal neutron. Boron containing shielding materials: e.g. Boron containing concrete, borated polyethylene, boron containing flexible S hielding, boron containing epoxy resin composites.

References: MH Kharita et al, Progress in Nuclear Energy, 53 (2011) 207-211 http://www.shieldwerx.com/flexible-shielding.html

Reasons for shielding neutron

Boron rich slag could be used as filler to making shielding materials. The shielding property of the slag should be characterized.

Raw material and method

Element B O C Mg Al Si Ca Fe Boron-rich slag 3.65 42.097 7.364 21.068 3.727 10.763 10.541 0.79 Chemical composition of boron rich slag (wt％)

Raw material and method

20 30 40 50 60 70 75 1000 2000 3000 4000 5000

▲ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★

• ★

★ ▲ ★ ★ ★ ★ ★ ★ ▲ ▲ ▲ ▲ ▲ ▲ ▲ ▲

（ ） Intensity a.u 2Theta

▲2MgO·B2O3 ★Mg2SiO4

• Ca2SiO4

XRD pattern of boron rich slag

Suanite: 2MgO•B2O3 Olivine: Mg2SiO4 and Ca2SiO4

Raw material and method

A

= ( )

i i i i

E N M   

 

∑E (cm-1) is the macro-cross section of boron-rich slag, ωi is the mass fraction of ith element, NA is the Avogadro Constant, ρ (g/cm3) is the density of boron-rich slag, Mi is the molar mass of ith element, (σ)i (measured in barn) is micro-cross section of ith element. Macro cross section of boron-rich slag

A

( ) = 100

i i i

N M C E    



％ Contribution of each element contained for the macro cross section of boron-rich slag

References: Li Z.F, Nucl. Sci. Tech. 23, 344–348 (2012); Dong, M. Nucl. Sci. Tech. (2018) 29:58.

Results and discussion

Element B O C Mg Al Si Ca Fe Micro-cross section (barn) 772.24 4.23219 5.5545 3.773 1.734 2.338 3.26 14.18

References: Sears, V. F. Neutron News. 3, 29–37 (1992); https://www.ncnr.nist.gov/resources/n-lengths/list.html#tc_qz_original=86840491

Micro cross section of elements contained in boron-rich slag for thermal neutron (Density=2.97 g/cm3)

Results and discussion

1 2 3 4 5

Colemanite concentrator waste

[4]

PE-B4C concrete

[3]

Ordinary concrete

[2]

FeCr slag

[1]

（ Macro cross section cm

• 1）

Boron-rich slag

Reference: 1 Korkut, T. et al. Sci. Technol. Nucl. Ins. 2014, 190–193 (2014) ; 2 Bashter, I.I. Ann. Nucl. Energy. 24, 1389–1401 (1997); 3 Demir, D. et al. Nucl. Instru. Meth. B. 245, 501–504 (2006); 4 DiJulioa, D. D. et al.Nucl. Instru. Meth. A. 859, 41–46 (2017)

Results and discussion

Reference: 1 Korkut, T. et al. Sci. Technol. Nucl. Ins. 2014, 190–193 (2014) ; 2 Bashter, I.I. Ann. Nucl. Energy. 24, 1389–1401 (1997); 3 Demir, D. et al. Nucl. Instru. Meth. B. 245, 501–504 (2006); 4 DiJulioa, D. D. et al.Nucl. Instru. Meth. A. 859, 41–46 (2017)

1 2 3 4 5

Colemanite concentrator waste

[4]

PE-B4C concrete

[3]

Ordinary concrete

[2]

FeCr slag

[1]

（ Macro cross section cm

• 1）

Boron-rich slag

Results and discussion

1 2 3 4 5

Colemanite concentrator waste

[4]

PE-B4C concrete

[3]

Ordinary concrete

[2]

FeCr slag

[1]

（ Macro cross section cm

• 1）

Boron-rich slag It has potential to prepare shielding materials

Reference: 1 Korkut, T. et al. Sci. Technol. Nucl. Ins. 2014, 190–193 (2014) ; 2 Bashter, I.I. Ann. Nucl. Energy. 24, 1389–1401 (1997); 3 Demir, D. et al. Nucl. Instru. Meth. B. 245, 501–504 (2006); 4 DiJulioa, D. D. et al.Nucl. Instru. Meth. A. 859, 41–46 (2017)

Results and discussion

Element B O C Mg Al Si Ca Fe Contribution(％) 92.85 3.97 1.26 1.15 0.09 0.32 0.31 0.07 Contribution of each element contained in boron-rich slag for thermal neutron shielding

Results and discussion

2MgO• B2O3

Elastic Absorption

γray γray γray γray Mg2SiO4 Ca2SiO4

Shielding mechanism of boron-rich slag for shielding thermal neutron

Thus 2MgO•B2O3 (Suanite) is the main compound for shielding thermal neutron and far more than other

• compounds. It can be seen that the main shielding forms are elastic and absorption. However, the effect of

absorption is far more than elastic. Besides, the effect of absorption emitted the gamma ray is the biggest.

Conclusions 01

The result of the macro cross section of boron-rich slag is 5.02 cm-1, higher than ordinary concrete, PE-B4C concrete, FeCr slag and colemanite concentrator for neutron shielding.

02

The maximum contribution of the elements contained in boron rich slag for shielding thermal neutron is B, it is 92.85％, far more than the contribution of

• ther elements. 2MgO•B2O3 (Suanite) is the main compound of boron-rich slag

for shielding thermal neutron. Main shielding forms are elastic and absorption. However, the effect of absorption is far more than elastic. Besides, the effect of absorption emitted the gamma ray is the biggest.

03

Boron-rich slag would be excellent shielding material or filler for neutron

• shielding. Besides, the investigation provides a method to analyze the

shielding mechanism of complex shielding material for thermal neutron.

Additional-Boron rich slag/epoxy resin composites

Resin: Slag 160: 100-900 (Mass ratio) The thickness of composites is 0.5cm.

100 300 500 700 900 10 20 30 40 50

％ Shielding percentage ( ) Slag addition

Transmission (% )

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