Study of the behavior of iodine and rhenium during oxidative roasting of lead cake
Berdikulova F. Maldybayev G. Mendeke M.
2025SciCell s.r.o.
Acta Metallurgica Slovaca
2025#31Issue 4234 - 237 pp.
Oxidative roasting aims to convert rhenium into a water-soluble form, followed by leaching into solution and subsequent sorption–desorption steps to obtain ammonium perrenate. It was found that the presence of iodine significantly affects the technological parameters of rhenium extraction during sorption and desorption stages, reducing the ion-exchange capacity for rhenium due to the simultaneous transition of iodide and perrenate species into solution. The main objective of this study was to determine the technological parameters that ensure effective separation of iodine and rhenium during oxidative roasting. Experimental data showed that the maximum transfer of rhenium (up to 95.6%) into water-soluble compounds occurs at 300–400 ℃, when iodine compounds have not yet volatilized. At temperatures above 400 ℃, iodine sublimates mainly as PbI2, accompanied by a decrease in rhenium extraction efficiency. It was experimentally established that, under optimal roasting conditions, rhenium is concentrated in the solid phase as perrenates and iodides, ensuring almost complete dissolution during subsequent leaching. The volatilisation of iodine at elevated temperatures leads to the decomposition of rhenium iodides and the formation of insoluble metallic phases, thereby negatively affecting extraction.
iodides , iodine , leaching , lead cake , oxidative roasting , perrenates , rhenium , sorption
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Republican State Enterprise on the Right of Economic Management National Center on Complex Processing of Mineral Raw Materials of the Republic of Kazakhstan, Zhandosova Street, 67, Almaty, 050036, Kazakhstan
JCS Kazakh-British Technical University, 59 Tole bi Str., Almaty, 050000, Kazakhstan
RSE on the REM National Center on Complex Processing of Mineral Raw Materials of the Republic of Kazakhstan, Zhandosova Street, 67, Almaty, 050036, Kazakhstan
Republican State Enterprise on the Right of Economic Management National Center on Complex Processing of Mineral Raw Materials of the Republic of Kazakhstan
JCS Kazakh-British Technical University
RSE on the REM National Center on Complex Processing of Mineral Raw Materials of the Republic of Kazakhstan
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