Development Status of Processing Technology for Spent Potlining in China

Li, Wangxing; Chen, Xiping

doi:10.1007/978-3-319-48200-2_143

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…This represents approximately 40-50% of the SPL generated outside of China annually. Large-scale SPL treatment or management solutions in China are still relatively limited 2,19,23 .…”

Section: Understanding the Context: Global Spl Generation And Activitiesmentioning

confidence: 99%

Developing Guidance to Support Sustainable Spent Pot Lining (SPL) Management Across the Aluminum Industry

Nunez

2020

JOM

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“…This represents approximately 40-50% of the SPL generated outside of China annually. Large-scale SPL treatment or management solutions in China are still relatively limited 2,19,23 .…”

Section: Understanding the Context: Global Spl Generation And Activitiesmentioning

confidence: 99%

Developing Guidance to Support Sustainable Spent Pot Lining (SPL) Management Across the Aluminum Industry

Nunez

2020

JOM

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“…In general, by adding a certain amount of CaCO 3 in a high-temperature environment, the soluble NaF in SPL can be converted into stable CaF 2 , reducing the harm of soluble fluoride sharply. In previous studies, limestone was used to convert harmful fluorides into harmless and stable fluorides [ 11 , 13 , 14 ]. However, when limestone is used as a reactant to turn soluble fluorides into stable fluorides at a high processing temperature, some negative effects appear, such as the final product easily agglomerating and adhering to the furnace lining, so an anti-adhesive additive needs to be added.…”

Section: Introductionmentioning

confidence: 99%

Recycling of Spent Pot Lining First Cut from Aluminum Smelters by Utilizing the Two-Step Decomposition Characteristics of Dolomite

et al. 2020

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Spent Pot Lining First Cut (shortened to SPL-1cut) is a solid waste discharged from a primary aluminum electrolytic production process. SPL-1cut is classified as hazardous waste in China because it contains large amounts of soluble sodium fluoride and a tiny amount of cyanide. Most of SPL-1cut is carbon—about 65%—and its calorific value is 22.587 MJ∙kg−1. There is a high level of sodium fluoride in SPL-1cut—about 15%—and sodium fluoride is randomly distributed in the carbon granule. The recycling of SPL-1cut using dolomite as a reactant, based on the characteristics of the two-step decomposition of dolomite at a high temperature, is discussed. The recycling of SPL-1cut was performed under the following heating conditions: the heating temperature was 850 °C, the holding time was 120 min, and 40% of the dolomite was added to the SPL-1cut. It was found that the cyanides are completely oxidized and decomposed, and dolomite is decomposed into MgO and active CaCO3. At the same time, NaF reacts with active CaCO3 and converts into CaF2. The results provide references for using SPL-1cut as an alternative fuel in the dolomite calcination process of the Pidgeon Process.

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“…8,14,15 Schönfelder reports on a flotation technique to separate carbon and silicate parts. 16 The SPL waste is firstly exposed to sulphuric acid. In this process, the waste detoxifies, and at the same time H 2 SiF 6 acid forms as a product.…”

mentioning

confidence: 99%

Sustainable waste-treatment procedure for the spent potlining (SPL) from aluminium production

Tropenauer¹,

Klinar²,

Samec³

et al. 2019

Mater. Tehnol.

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Some different possible solutions to the problem of industrial waste originating from primary aluminium production (also known as SPL) have been investigated. The latest techniques to treat SPL are presented, with the highlight being flotation and chemical treatment technology. Laboratory tests confirmed that the SPL treatment model is not feasible and viable within partial solutions. Only the systematically achieved solution can be in accordance with a wide range of contemporary demands. Partly, the cause is the allotropic form of the carbon cathodes produced and partly also the impurities in the waste material that prevent an effective one-phase treatment. Laboratory investigations of reactive extraction open up the possibilities for wide SPL material utilization. The preliminary inquiry confirms that the interdisciplinary approach leads to open solutions leading to possible market interest or generated value from the waste as the main goal of a circular economy.

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Development Status of Processing Technology for Spent Potlining in China

Cited by 5 publications

References 4 publications

Developing Guidance to Support Sustainable Spent Pot Lining (SPL) Management Across the Aluminum Industry

Developing Guidance to Support Sustainable Spent Pot Lining (SPL) Management Across the Aluminum Industry

Recycling of Spent Pot Lining First Cut from Aluminum Smelters by Utilizing the Two-Step Decomposition Characteristics of Dolomite

Sustainable waste-treatment procedure for the spent potlining (SPL) from aluminium production

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