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Zero-waste process for the transformation of a hazardous aluminum waste into a raw material to obtain zeolites

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López Delgado, Aurora and Robla Villalba, José Ignacio and Padilla, Isabel and López Andrés, Sol and Romero, Maximina (2020) Zero-waste process for the transformation of a hazardous aluminum waste into a raw material to obtain zeolites. Journal of Cleaner Production, 255 (120178). ISSN 0959-6526, ESSN: 1879-1786

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Official URL: https://www.sciencedirect.com/science/article/pii/S0959652620302250


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Abstract

A potential route to minimize the environmental impact of industrial activities is, among other approaches, the use of hazardous wastes as less-common raw materials for the preparation of other materials. Realistic technologies for waste management should include simple and low-cost processes as well as the nonproduction of new wastes. Thus, the total conversion of a type of hazardous aluminum waste into zeolite was achieved at the pilot-scale (200 l autoclave reactor) under mild hydrothermal operating conditions. In a one-step process, 3.2 tons of zeolite, 76.4 Nm3 of ammonia and 105.9 Nm3 of hydrogen can be produced per ton of aluminum waste. The process does not generate other wastes. The recycling of process effluents (mother liquor and rinse water), along with the process gases capture and its subsequent commercialization, would increase the environmental impact and the economic yield. The obtained Linde type-A zeolite, exhibited structural, textural and morphological characteristics similar to those of zeolites prepared from commercial reagents. A conceptual design for zero-waste process is proposed. The sustainable process developed can contribute to reduce the high environmental impact of aluminum industry waste, and contribute to the circular economy by converting a hazardous waste into a raw material.


Item Type:Article
Uncontrolled Keywords:Zero-waste process, Hazardous aluminum waste, Pilot-scale, Zeolite A
Subjects:Sciences > Geology > Mineralogy
Sciences > Chemistry > Materials
ID Code:59108
Deposited On:13 Feb 2020 17:44
Last Modified:14 Feb 2020 08:43

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