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

Química Nova

Santana Filho, Salomão¹  Universidade Federal de Viçosa, Viçosa, Brazil¹  Mello, Jaime Wilson Vargas de¹  Universidade Estadual de Campinas, Campinas, Brazil¹  Universidade Federal de Minas Gerais, Belo Horizonte, Brazil¹  Dussin, Tânia Mara¹  Andrade, Renato Pereira de¹  Figueiredo, Bernardino Ribeiro de¹ 

关键词: arsenopyrite;    acid mine drainage;    contamination.;   

DOI  :  10.1590/S0100-40422008000500037

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 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】

Unknown