Abstract

MAESTIGUES-PALANCO, Reynaldo A.; MAS-DIEGO, Siannah Maria  and  PEREZ-GARCIA, Liudmila. Bioextraction of metallic species from tailings from the metallurgical industry with a biological reducing agent. RTQ [online]. 2023, vol.43, n.3, pp. 638-659.  Epub Oct 30, 2023. ISSN 2224-6185.

In the present investigation, a study was carried out on the use of microorganisms for the bioextraction of metallic species contained in the filtered tails, the main solid residue of the acid nickel extracting process. The developed study shows that fungus Trichoderma harzianum Rifai (A-34) has the ability to degrade multiple compounds. From the mycelial mass obtained, the incubation of the fungus was carried out under adequate temperature and agitation conditions, for a period of 24 hours. The biological reducing agent (ARB) produced by the fungus TrichodermaharzianumRifai (A-34) contains organic acids. Among this acids, citric acid (C₆H₈O₇) has the higher concentration, which is more effective as a leaching agent. The effect of temperature was evaluated during the bioextraction process at 25 and 50 °C in 40g of filtered glue for 20 days. The content of metallic species in the leached liquor obtained from the bioextraction experiments in the tailings process is higher than the ARB concentration of 100 % at a temperature of 50°C, due to the increase in temperature, which causes the decrease in pH by modifying the activity of the ions in the solution, making the medium more acidic, thus favoring leachability in the filtered tailings under study.

Keywords : Trichoderma harzianum Rifai fungus (A-34); bioextraction; leachability.

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