Utilization of Bacillus pumilus and Citrobacter youngae as Flotation Bioreagents in the Microflotation of Chalcopyrite, Pyrite, and Silica  

Oleh:

Sanwani, Edy ; Hidayati, Dita ; Chaerun, Siti Khodijah

Jenis: Article from Journal - ilmiah nasional - terakreditasi DIKTI
Dalam koleksi: Microbiology Indonesia vol. 10 no. 1 (Mar. 2016), page 15-22.
Topik: bioflotation; biosurfactant-producing mixotrophic bacteria; chalcopyrite; flotation; iron-sulfuroxidizing bacteria; microflotation; pyrite; silica
Fulltext: 375-1141-1-PB_Ros.pdf (3.22MB)

Isi artikel

To date, relatively toxic and expensive chemical reagents are routinely used in the flotation of sulfide and oxide minerals in mining and metallurgical industries. To establish a more environmentally friendly flotation process, alternative flotation reagents have been explored extensively by using microbes and their metabolic products such as biosurfactants or EPS (extracellular polymeric substances). Hence, the present work focused on the application of the mixotrophic bacteria capable of both producing biosurfactants and oxidizing iron and sulfur (herein Bacillus pumilus strain SKC-2 and Citrobacter youngae strain SKC-4) as flotation bioreagents in the microflotation of chalcopyrite (CuFeS ), pyrite (FeS ), and silica (SiO ). Laboratory microflotation tests 2 2 2 using both bacterial strains as bioreagents were evaluated as a function of conditioning time, pH, and bacterial cell concentration. Experimental evidence indicated that the chalcopyrite recoveries could be achived using both bacterial strains but its better recovery was obtained with the bacterium Citrobacter youngae as bioreagents. In addition, the flotability of chalcopyrite was greater than that of pyrite or silica, indicating that both bacterial strains can function not only as collector for chalcopyrite but also as depressant for pyrite and silica. The findings of this study thus suggest the possible application of both bacterial strains as flotation bioreagents in order to establish a more eco-friendly mineral processing.

Opini Anda

Klik untuk menuliskan opini Anda tentang koleksi ini!

Kembali