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Metals 2018, 8(3), 177; https://doi.org/10.3390/met8030177

Low-Waste Recycling of Spent CuO-ZnO-Al2O3 Catalysts

Faculty of Non-ferrous Metals, AGH University of Science and Technology, 30-059 Krakow, Poland
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Received: 22 January 2018 / Revised: 5 March 2018 / Accepted: 7 March 2018 / Published: 12 March 2018
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Abstract

CuO-ZnO-Al2O3 catalysts are designed for low-temperature conversion in the process of hydrogen and ammonia synthesis gas production. This paper presents the results of research into the recovery of copper and zinc from spent catalysts using pyrometallurgical and hydrometallurgical methods. Under reducing conditions, at high temperature, having appropriately selected the composition of the slag, more than 66% of the copper can be extracted in metallic form, and about 70% of zinc in the form of ZnO from this material. Hydrometallurgical processing of the catalysts was carried out using two leaching solutions: alkaline and acidic. Almost 62% of the zinc contained in the catalysts was leached to the alkaline solution, and about 98% of the copper was leached to the acidic solution. After the hydrometallurgical treatment of the catalysts, an insoluble residue was also obtained in the form of pure ZnAl2O4. This compound can be reused to produce catalysts, or it can be processed under reducing conditions at high temperature to recover zinc. The recovery of zinc and copper from such a material is consistent with the policy of sustainable development, and helps to reduce the environmental load of stored wastes. View Full-Text
Keywords: sustainable development; recycling; spent catalysts; zinc; copper sustainable development; recycling; spent catalysts; zinc; copper
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Małecki, S.; Gargul, K. Low-Waste Recycling of Spent CuO-ZnO-Al2O3 Catalysts. Metals 2018, 8, 177.

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