微纳米气泡去除高放射性废液中的金属离子研究

doi:10.19964/j.issn.1006-4990.2022-0729

Abstract

Abstract:

The spent fuel reprocessing process produces waste liquids containing ¹⁵⁵Eu，⁹⁰Sr，¹³⁷Cs，¹⁴⁹Sm and other intermediate and long half-life nuclides，which are highly radioactive.The treatment of high-level radioactive liquid waste（HLLW） is a key step in spent fuel reprocessing.Previous methods such as precipitation and adsorption have all generated a significant amount of secondary waste.To solve this problem，the method of removing metal ions from waste liquid by micro/nano bubble ion flotation was innovatively proposed，and the process of removing metal ions by micro/nano bubbles was modeled by finite element method.The generation and diffusion of micro/nano bubbles in solution and the removal process of metal ions were explored，and the effects of metal ion valence，adsorption reaction equilibrium constant，temperature，etc.on the flotation process were analyzed，and the selective flotation characteristics was further studied when multiple metal ions were coexisted.The results showed that metal ions with high equilibrium constants and high valence states were more easily flotation from solution，and for metal ions with equilibrium constants greater than 10，more than 90% removal rate could be achieved.Controlling the concentration of micro/nanobubble and the concentration of surfactant could enrich the metal ions with equilibrium constants greater than 0.5 by selective flotation.The results of the study were of great guidance for the removal of metal ions from HLLW.

Key words: high-level radioactive liquid waste, micro/nano bubble, ion flotation, finite element method

CLC Number:

TQ110.9

DONG Yizhuo, LI Hongru, SUN Ke, YIN Junlian, ZHOU Wentao, WANG Dezhong. Study on removal of metal ions from highly radioactive waste streams by micro/nano bubbles[J]. Inorganic Chemicals Industry, 2023, 55(7): 81-88.

Figures/Tables 15

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Table 1

Parameters in COMSOL model"

参数	计算公式	数值	含义
H_MNBs	comsol默认	2 938.4 Pa·m³/mol	水中MNBs的亨利常数
k_MNBs	comsol默认	1×10^-4 m/s	水中MNBs的质量传递系数
M_MNBs	comsol默认	0.044 kg/mol	MNBs的摩尔质量
d_b	comsol默认	0.001 m	气泡流中气泡直径
V_b	4/3· $π$ ·（d_b/2）³	5.236×10^-10 m³	气泡流中气泡体积
ρ_{g_in}	comsol默认	1.77 kg/m³	气泡流中气体密度
Φ_{g_in}	comsol默认	0.05	气泡流气体体积比
N_{d_in}	Φ_{g_in}/V_b	9.549 3×10⁷ m^-3	气泡流气泡数密度
v_in	comsol默认	0.001 m/s	气泡流流速
N_{df_in}	N_{d_in}·v_{p_in}	1.909 9×10⁶ m^-2/s	气泡流数量通量
g_{mf_in}	v_in·ρ_{g_in}	0.001 77 kg/（m²·s）	气泡流质量通量
v_{p_in}	v_in/Φ_{g_in}	0.02 m/s	气泡流中单个气泡运动速度
K_{eq_Nd}	$C (C H 3 C O O) 3 N d / C N d 3 + C C H 3 C O O - 3$	10 000	Nd³⁺与乙酸根络合反应平衡常数近似值
K_{eq_Sr}	$C (C H 3 C O O) 2 S r / C S r 2 + C C H 3 C O O - 2$	10	Sr²⁺与乙酸根络合反应平衡常数近似值
K_{eq_Cs}	$C C H 3 C O O C s / C C s + C C H 3 C O O -$	0.5	Cs⁺与乙酸根络合反应平衡常数近似值
K_{eq_K}	$C C H 3 C O O K / C K + C C H 3 C O O -$	10^-0.44	K⁺与乙酸根络合反应平衡常数值

Table 1

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Study on removal of metal ions from highly radioactive waste streams by micro/nano bubbles

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