Arsenic mobilization from sulfidic materials from gold mines in Minas Gerais State

Química Nova

Renato Pereira De Andrade²  Salomão Santana Filho¹  Jaime Wilson Vargas De Mello¹  Bernardino Ribeiro De Figueiredo¹  Tânia Mara Dussin¹ 

[1] ,Universidade Federal de Minas Gerais Instituto de Ciências Exatas Departamento de QuímicaBelo Horizonte MG ,Brazil

关键词: arsenopyrite;    acid mine drainage;    contamination;   

DOI  :  10.1590/S0100-40422008000500037

来源: SciELO

【 摘 要 】

Acid drainage results from exposition of sulfides to the atmosphere. Arsenopyrite is a sulfide that releases arsenic (As) to the environment when oxidized. This work evaluated the As mobility in six sulfidic geomaterials from gold mining areas in Minas Gerais State, Brazil. Grained samples (<2 mm) were periodically leached with distilled water, during 70 days. Results suggested As sorption onto (hydr)oxides formed by oxidation of arsenopyrite. Low pH accelerated the acid generation, dissolving Fe oxihydroxides and releasing As. Presence of carbonates decreased oxidation rates and As release. On the other hand, lime added to a partially oxidized sample increased As mobilization.

【 授权许可】

CC BY-NC   
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