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摘要:
赤泥中富含铝、铁、钛等多种有价金属，以及钪、钇、铈、镧等稀土元素，是一种极具回收价值的二次资源。目前，国内外钛被广泛应用于各个领域，钪由于稀缺导致价格昂贵。赤泥作为碱性固体废弃物，具有较高的钪钛含量，可以加以回收利用，缓解资源匮乏的同时又能改善环境。本文综述了目前国内外赤泥中钪和钛的回收研究现状，并指出了各工艺存在的问题，同时对赤泥中钪和钛的选择性回收提出了展望。
Abstract:As a secondary resource with high recycling value, red mud is rich in various valuable metals such as aluminum, iron and titanium, as well as many rare earth elements like scandium, yttrium, cerium and lanthanum. At present, the titanium is widely used in various fields at home and abroad, as well as the scandium is expensive due to its scarcity. As an alkaline solid waste, red mud is an important raw material containing scandium and titanium, which should be used to alleviate the lack of resources and improve the environment. In this paper, the current research status of the recovery of scandium and titanium in red mud at home and abroad was reviewed, and the problems of each process were pointed out. Meanwhile, the prospect of selective recovery of scandium and titanium in red mud was proposed.
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Key words:
- red mud /
- scandium /
- titanium /
- recovery /
- secondary resources
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表 1 从赤泥中回收钪和钛的工艺总结
Table 1. The process summary of scandium and titanium recovery from red mud
Valuable element Method Recovery rate Lack of technology Reference Sc Hydrometallurgy 99% Other elementsare extracted at the same time, such as titanium [15] 98% Complex process and high cost of solvent [16] Combined method ＞80% Recovery rate is low [33] ＞90% High energy consumption and low comprehensive utilization [34] Ti Acid leaching - High energy consumption and waste gas pollution [25] 64.5% The metal ion selectivity is poor by acid leaching [26] 73% Long process and low recovery [31] 54.3% Recovery rate is low [27] ＞80% High acid concentration and harsh treatment environment [28] 
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