钡渣烧结砖的制备及Ba2+浸出行为的钝化机制研究

doi:10.19964/j.issn.1006-4990.2024-0479

Abstract

Abstract:

Barium slag，as a hazardous industrial waste，offers dual benefits of environmental and economic value through its resource utilization.The barium slag was innovatively used as an additive to prepare building bricks in this study，the influence of barium slag content on the chemical composition，phase composition，microstructure，and physical properties of the bricks was systematically investigated.The migration and transformation behavior of Ba²⁺ during the sintering process was analyzed and the passivation mechanism of Ba²⁺ leaching was revealed.The results indicated that when the barium slag content was 6% and the sintering temperature was 1 250 ℃，the sintered bricks exhibited optimal comprehensive properties：The sample's porosity was 8.36%，water absorption rate was 3.51%，and compressive strength was 66.17 MPa.The leaching test results showed that the Ba²⁺ leaching concentration of the product was 1.77 mg/L.The BaO component in the barium slag reacted with the Al₂O₃-SiO₂ binary system to form a BaO-Al₂O₃-SiO₂ liquid phase，which had a dual effect.On one hand，it significantly reduced the porosity and water absorption rate of the samples，and on the other hand，it promoted the development and growth of the mullite crystalline phase.This synergistic effect increased the compressive strength of the products by up to 100%.The passivation mechanism of Ba²⁺ leaching behavior manifested as a triple effect.Firstly，the introduction of barium slag improved the density of the sample，effectively blocking acid solution penetration into the sample interior to leach Ba²⁺.Secondly，the Ba²⁺-containing liquid phase transformed into a glass phase，restraining Ba²⁺ leaching.Finally，BaO reacted with mullite to form barium feldspar phase with excellent acid corrosion resistance.

Key words: barium slag, sintered bricks for construction, sintering, physical properties, Ba²⁺ solidification

CLC Number:

TU522.1

LI Xincong, HU Jingrong, GUO Xinqiao. Study on preparation of barium slag-based sintered bricks and passivation of Ba²⁺ leaching activity[J]. Inorganic Chemicals Industry, 2025, 57(8): 110-116.

Figures/Tables 10

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References 17

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原料	w（SiO₂）	w（Al₂O₃）	w（CaO）	w（MgO）	w（Fe₂O₃）	w（Na₂O）	w（K₂O）	w（BaO）	w（SO₃）	w（烧失量）
钡渣	19.66	10.58	12.35	3.01	1.52	0.69	1.23	30.26	10.39	10.31
煤矸石	58.34	12.41	6.03	2.57	2.55	1.45	0.24	0.02	0.51	15.88
铝矾土	12.22	70.26	0.26	0.01	2.23	0.73	0.61	0.01	0.29	13.38

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of barium slag-based sintered bricks and passivation of Ba²⁺ leaching activity

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Study on preparation of barium slag-based sintered bricks and passivation of Ba2+ leaching activity