Abstract

Alexandr Ivanovich Khanchuk³, Aleksandr Alekseevich Yudakov¹, Mikhail Azaryevich Medkov¹, Leonid Nikolayevich Alekseyko², Andrey Vasilyevich Taskin² and Sergey Igorevich Ivannikov¹

DOI : http://dx.doi.org/10.13005/ojc/320646

The results of the research interaction between ash and slag samples from Vladivostok TPP’s landfills saturated with underburning and ammonium hydrodifluoride were given. It was found out that the reactions of the main components of a concentrate with NH₄HF₂ are flowing with creation of complex ammonium fluoro-metalate. It is shown that the distribution of REM (rare earth metals) between foam and heavier products is going during the flotation process of carbon-containing ash and slag samples without significant concentrating. It is shown that the water leaching of fluoridated product lets transfer silicone, aluminum and iron salts into solution and concentrate rare earth elements in insoluble residue in the form of complex salts of NaLnF₄ general formula. We propose a schematic diagram of hydrodifluoride recycling of carbon-containing sample, which provides concentrating of REM with incomplete separation of macro-components.

technogenic field; energy enterprises waste; rare earth metals (REM); noble metals; Ammonium hydrodifluoride

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