Research on industrialization technology of pressurized leaching of overhauling slag and regeneration of cryolite from aluminum electrolysis process
This paper explores the migration patterns of elements such as fluorine,sodium and aluminum under different leaching conditions in aluminum electrolysis overhaul slag,as well as the process parameters for preparing cryolite through leaching solution regeneration.Different leaching conditions and cryolite precipitation conditions were tested,NaOH concentration of 50 g/L,reaction temperature of 120℃,liquid-solid ratio of 5∶1,material particle size of 60～80 mesh,and reaction time of 3 h.Under these conditions,sodium,fluorine and aluminum leaching rates can reach 80％～85％,and the leaching residue meets the requirements for harmless treatment.Under the conditions of reaction time 4 h,reaction temperature 90℃,and acid-base so-lution volume 1∶3.5,the purity of regenerated cryolite reaches 90％,which can meet the requirements of aluminum electrolysis for reuse.
aluminum electrolysishazardous waste residuepressurized leachingneutralization and precipitationrecycled cryolite
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维普
