高炉矿渣-粉煤灰基地质聚合物固化铅离子及防辐射性能研究

doi:10.19964/j.issn.1006-4990.2021-0669

Abstract

Abstract:

Using of blast furnace slag（BFS） and fly ash（FA） as raw materials to prepare geopolymers was studied.Using NaOH and water glass as the alkali activator，the geopolymer solidified Pb²⁺was prepared under the condition of alkali excitation.The effect of Pb²⁺content on the strength of the cured body was studied，and its curing effect and curing mechanism were explored through leaching toxicity test，X-ray diffraction analysis（XRD），infrared spectrum analysis（FT-IR），electronic scanning electron microscope（SEM） and other characterization analysis and radiation resistance experiment test.The results showed that the blast furnace slag?fly ash?based geopolymer had good compatibility with Pb²⁺，and the maximum compressive strength of the solidified body could reach 43 MPa at 28 d，and the strength of the solidified body could be improved when the addition amount of Pb²⁺ was 1%.The leaching experiment showed that the curing efficiency of the cured body to 1% Pb²⁺ was above 99%.Microscopic analysis suggested that most of the heavy metals were physically encapsulated in the geopolymer in the form of hydroxyl complex ions.Radiation protection experiments showed that the content of Pb²⁺was positively correlated with the γ-ray shielding effect of blast furnace slag?fly ash?based geopolymers，the optimal content of Pb²⁺ in the test was 3%，and the linear absorption coefficient and the optimal value of the half-attenuation layer thickness were 0.222 0 cm^-1 and 2.309 5 cm，respectively.

Key words: geopolymer, curing, Pb²⁺, radiation resistance performance

CLC Number:

TQ127.2

CAI Zhuoyu,LIU Qing,BI Jiaqi,LIU Yushan,ZHENG Shaowei,ZHAO Guodong. Study on Pb²⁺solidification and radiation protection performance of blast furnace slag?fly ash based geopolymer[J]. Inorganic Chemicals Industry, 2022, 54(8): 125-131.

Figures/Tables 16

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浸出溶液	pH	掺入不同质量分数Pb²⁺样品的浸出Pb²⁺质量浓度/（mg·L^-1）				掺入不同质量分数Pb²⁺样品固化Pb²⁺效率/%
浸出溶液	pH	0.5%	1.0%	2.0%	3.0%	0.5%	1.0%	2.0%	3.0%
去离子水	9.0	0.132 9	0.375 3	0.734 3	1.235 6	99.468	99.249	99.087	99.014
混合酸溶液	3.2	0.293 5	0.704 6	1.475 8	1.997 3	99.371	99.211	99.052	98.467
醋酸缓冲液	2.6	1.387	3.674	8.912	12.110	98.157	97.152	94.163	92.177

pH	重金属浸出质量浓度/（mg·L^-1）
pH	1 d	3 d	7 d	10 d	14 d	21 d	28 d	35 d	42 d	49 d	56 d
5	0.635 4	0.287 2	0.196 3	0.113 5	0.074 6	0.025 7	0.011 4	0.008 7	0.005 3	0.004 5	0.004 3
9	0.394 6	0.187 8	0.074 4	0.047 5	0.031 7	0.013 4	0.008 6	0.006 3	0.004 6	0.003 9	0.003 8

项目	I_b/计数	I_0测/计数	项目	I_b/计数	I_0测/计数
1	3 653	9 238	4	3 680	9 284
2	3 639	9 276	均方根值	3 660	9 266
3	3 668	9 266

项目	I_测/计数
项目	1	2	3	4	均方根值
C1-1	7 426	7 418	7 442	7 441	7 431.7
C1-2	7 421	7 429	7 421	7 431	7 425.5
C2-1	7 365	7 326	7 344	7 382	7 354.2
C2-2	7 342	7 332	7 353	7 341	7 342.0
C3-1	1 316	7 309	7 321	7 319	7 316.2
C3-2	7 306	7 312	7 294	7 313	7 308.7
C4-1	7 286	7 237	7 245	7 265	7 258.2
C4-2	7 256	7 253	7 248	7 241	7 249.5

项目	I_测	I_测-I_b	I_0测- I_b	μ/cm^-1	μ平均值/cm^-1	HVL/cm	HVL平均值/cm
C1-1	7 431.7	3 771.7	5 605	0.198	0.198 5	2.312	2.309 5
C1-2	7 425.5	3 765.5	5 605	0.199	0.198 5	2.307	2.309 5
C2-1	7 354.2	3 694.2	5 605	0.205	0.206 0	2.279	2.273 5
C2-2	7 342.0	3 682.0	5 605	0.207	0.206 0	2.268	2.273 5
C3-1	7 316.2	3 656.2	5 605	0.213	0.213 5	22.235	2.237 0
C3-1	7 308.7	3 648.7	5 605	0.214	0.213 5	2.239	2.237 0
C4-1	7 258.2	3 598.2	5 605	0.221	0.222 0	2.203	2.309 5
C4-2	7 249.5	3 589.5	5 605	0.223	0.222 0	2.194	2.309 5

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Study on Pb²⁺solidification and radiation protection performance of blast furnace slag?fly ash based geopolymer

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Study on Pb2+ solidification and radiation protection performance of blast furnace slag?fly ash based geopolymer