Long-term leaching mechanism of chromium-containing slag after vitrification and heat treatment
Long-term leaching mechanism of chromium-containing slag after vitrification and heat treatment
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DOI：
10.1016/j.ceramint.2022.01.218
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发表时间：
2022-01
影响因子：
5.2
通讯作者：
Shuai Zhang;Yanling Zhang;Shaowen Wu;Zheng Zhao;Yaoting Wu
中科院分区：
文献类型：
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作者：
Shuai Zhang;Yanling Zhang;Shaowen Wu;Zheng Zhao;Yaoting Wu
玻璃化和热处理是利用含铬渣的经济方法；然而，所制备的产品具有不同的Cr凝固能力。本文研究了两种路线对含铬渣长期浸出行为的影响。研究发现，Mg、Al、Cr 含量和热处理会影响矿物相的类型和相对含量，从而进一步促进样品的 Cr 浸出行为。其中，5Al-3Cr玻璃和热处理样品表现出相对较高的Cr浸出累积量。与热处理样品相比，玻璃样品具有更好的凝固能力，特别是对于高铬组。 Cr浸出积累量减少了70%~90%，表明熔体的玻璃化可以有效抑制Cr浸出相的形成。在浸出过程中，溶解的Ca/Mg/Al离子影响液体环境的pH值和氧化还原电位，导致Cr3+氧化为Cr6+。该研究表明，玻璃化是一种更安全、更有效的含铬渣资源化利用途径。
Vitrification and heat treatment are economical methods for utilizing Cr-containing slag; however, the prepared products have different Cr solidification abilities. Herein, the effects of the two routes on the long-term leaching behavior of Cr-containing slags were studied. The Mg, Al, and Cr contents and heat treatment were found to influence the type and relative content of the mineral phases, which further promoted the Cr leaching behavior of the samples. Among them, the 5Al-3Cr glass and heat-treated samples exhibited relatively higher Cr leaching accumulation. Compared with the heat-treated samples, the glass samples had a better solidification ability, particularly for the high-Cr-containing group. The Cr leaching accumulation decreased by 70%–90%, indicating that the vitrification of the melt can effectively inhibit the formation of the Cr-leachable phase. During the leaching process, the dissolved Ca/Mg/Al ions influence the pH and redox potential of the liquid environment, resulting in the oxidation of Cr3+to Cr6+. This research showed that vitrification is a safer and more effective route for the utilization of Cr-containing slag.