Parâmetros operacionais no processamento de zeólitas desativadas por fusão com KHSO4

Química Nova

Luciano Aragão De Mendonça²  Rupen Adamian²  Julio Carlos Afonso¹ 

[1] ,Universidade Federal do Rio de Janeiro Coordenação dos Programas de Pós-graduação em Engenharia Rio de Janeiro RJ ,Brasil

关键词: spent zeolites;    metal recovery;    waste management;   

DOI  :  10.1590/S0100-40422007000200041

来源: SciELO

【 摘 要 】

This work presents a study on the determination of the optimal experimental conditions for processing spent commercial zeolites in order to recover lanthanide elements and eventually other elements. The process is based on the fusion of the sample with potassium hydrogenosulfate (KHSO4). Three experimental parameters were studied: temperature, reaction time and catalyst/flux mass ratio. After fusion the solid was dissolved in water and the amount of insoluble matter was used to determine the efficiency of the process. The optimized experimental parameters depend on the composition of the sample processed. Under such conditions the insoluble residue corresponds to SiO2. Lanthanide elements and aluminum present in solution were isolated by conventional precipitation techniques; the yields were at least 75 wt%. The final generated wastes correspond to neutral colorless solutions containing alkali chlorides/sulfates and solids that can be disposed of in industrial dumps.

【 授权许可】

CC BY-NC   
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