Preparation of calcium aluminate and spinel by hydrolysis and calcination from secondary aluminum dross

IF 1.8 4区工程技术 Q3 Chemical Engineering

Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-07-29 DOI:10.1002/apj.3117

Yuqin Zhao, Zhengping Zuo, Zhanbing Li, Jianbo Zhang, Wen Fen Wu, Wei Ping Ma, Ganyu Zhu, Shaopeng Li, Fei Wang

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引用次数: 0

Abstract

The direct extraction of alumina from secondary aluminum dross (SAD), which is a dangerous solid waste, is difficult. Moreover, this process easily produces a large amount of solid waste residue, which is not easily utilized. In this paper, a new green process was developed to prepare calcium aluminate and Mg‐Al spinel from SAD by hydrolysis–calcification roasting. The effects of calcium oxide (CaO) content, sintering temperature, and holding time on the properties of calcium aluminate were investigated by single‐factor experiments. The phase transformation mechanism of calcium aluminate was studied by thermodynamic analysis, X‐ray diffraction analysis, X‐ray fluorescence spectroscopy, and scanning electron microscopy. Under the optimal conditions (Ca/Al molar ratio of 0.8, sintering temperature of 1300°C, and holding time of 2 h), the main calcium aluminate phases are CaAl2O4 and Ca2Al2SiO7, the soluble alumina content of the calcium aluminate sample is 49.71 wt.%, and the main phases of the acid‐insoluble residue are Mg‐Al spinel and a very small amount of CaTiO3. The Ca/Al ratio is the key factor affecting the calcium aluminate phase—with increasing Ca/Al ratio, the calcium aluminate phase is transformed from CaAl4O7 to CaAl2O4 and eventually to Ca12Al14O33, and the Si‐containing phase changes from Ca2Al2SiO7 to CaSiO4.

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通过水解和煅烧从二次铝渣中制备铝酸钙和尖晶石

从二次铝渣（SAD）这种危险的固体废物中直接提取氧化铝非常困难。而且，这种工艺容易产生大量固体废渣，不易利用。本文开发了一种新的绿色工艺，通过水解-煅烧焙烧法从 SAD 中制备铝酸钙和镁铝尖晶石。通过单因素实验研究了氧化钙（CaO）含量、烧结温度和保温时间对铝酸钙性能的影响。通过热力学分析、X 射线衍射分析、X 射线荧光光谱和扫描电子显微镜研究了铝酸钙的相变机理。在最佳条件下（Ca/Al 摩尔比为 0.8，烧结温度为 1300°C，保温时间为 2 小时），铝酸钙的主要相为 CaAl2O4 和 Ca2Al2SiO7，铝酸钙样品的可溶性氧化铝含量为 49.71 重量%，酸不溶性残留物的主要相为 Mg-Al 尖晶石和极少量的 CaTiO3。Ca/Al 比是影响铝酸钙相的关键因素--随着 Ca/Al 比的增加，铝酸钙相从 CaAl4O7 转变为 CaAl2O4，并最终转变为 Ca12Al14O33，而含硅相则从 Ca2Al2SiO7 转变为 CaSiO4。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Asia-Pacific Journal of Chemical Engineering 工程技术-工程：化工

CiteScore

3.50

自引率

11.10%

发文量

111

审稿时长

2.8 months

期刊介绍： Asia-Pacific Journal of Chemical Engineering is aimed at capturing current developments and initiatives in chemical engineering related and specialised areas. Publishing six issues each year, the journal showcases innovative technological developments, providing an opportunity for technology transfer and collaboration. Asia-Pacific Journal of Chemical Engineering will focus particular attention on the key areas of: Process Application (separation, polymer, catalysis, nanotechnology, electrochemistry, nuclear technology); Energy and Environmental Technology (materials for energy storage and conversion, coal gasification, gas liquefaction, air pollution control, water treatment, waste utilization and management, nuclear waste remediation); and Biochemical Engineering (including targeted drug delivery applications).