ارتباط با ما
با ما تماس بگیرید
0086-21-58386256
0086-21-58386256
The bioleaching recovery of nickel from low-grade nickel-copper sulphide tailings was found to be as high as 91.5%; furthermore, the nickel in the leaching mixture obtained by precipitation of sodium ettringite was enriched in the form of sulphide precipitation with a metal content of 8% . However, the industrial application of …
Bioleaching of copper sulfide minerals assisted by microbial fuel cells. Bioresource Technology, Volume 288, 2019, Article 121561. Tao Huang, …, Shaohui Zhang. Comparative study on chalcopyrite bioleaching with assistance of different carbon materials by mixed moderate thermophiles.
Abstract. Biofilm formation within the process of bioleaching of copper sulfides is a relevant aspect of iron- and sulfur-oxidizing acidophilic …
Copper Sulfide ores Chalcopyrite ore Bioleaching Indirect bioleaching (IBL) In situ leaching (ISL) In situ recovery (ISR) In situ mining (ISM) 1. Introduction In-situ …
The mixed bacterial community separated from multi-source heaps has a positive synergistic effect on the copper sulfide bioleaching efficiency, which improves copper extraction from 60.1% (Henan bacteria), 65.2% (Fujian bacteria), to 73.7% (mixed bacteria); • Declaration of competing of interest. There is no conflict of interest. …
The bioleaching of minerals is a simple and effective technology for the processing of sulfide ores and is used on a technical scale mainly for the recovery of copper and uranium. The effectiveness and economics of microbial leaching processes depend highly on the activity of the bacteria and on the chemical and mineralogical …
The bioleaching of copper sulfide ores in heaps is a technology widely developed in Chile, with more than 85,000 tons of ore processed per day (Brierley, 1999). Examples of large copper leaching operations are those by Sociedad Contractual Minera El Abra and the Codelco Division Radimiro Tomic in Chile producing 225,000 and 180,000 …
A longer exposure of test samples and biomedia is required for bioleaching of sulphide ores . Therefore, the tests were performed for 42 days in order to determine the most economically advantageous leaching time after the end of the experiments. ... P.A. Bacterial heap leaching approach for the treatment of low grade primary copper sulphide ...
Natural bioleaching has been taking place for almost as long as the history of the world, but it is only in the last few decades that we have realized that bioleaching is responsible for …
Galleguillos P, Remonsellez F, Galleguillos F, Guiliani N, Castillo D, Demergasso C (2008) Identification of differentially expressed genes in an industrial bioleaching heap processing low-grade copper sulphide ore elucidated by RNA arbitrarily primed polymerase chain reaction. Hydrometallurgy 94:148–154.
The results of this study with primary covellite (Acar et al. 2005) are consistent with the thermophilic bioleaching of primary chalcopyrite in that depressed redox conditions induced by extremely thermophilic microbial activity favor the leaching of copper from primary copper sulfide minerals. Bioleaching of enargite (Cu 3 AsS 4), a primary ...
Bioleaching may be effectively used to extract nonferrous metals from sulfide ores and concentrates. At the same time, some minerals are refractory and their bioleaching rate is often comparatively …
Bioleaching involves a chemical-microbial-driven dynamic process of oxidation and dissolution, as well as formation of surface secondary phases that change the copper sulfide exposure/occlusion profiles. This dynamic process determines the kinetics of copper sulfides bioleaching.
Compared with the traditional pyrometallurgical process, copper bioleaching has distinctive advantages of high efficiency and lower cost, enabling efficiently extracts of valuable metal resources from copper sulfides. Moreover, during long-term industrial applications of bioleaching, many regulatory enhancements and technological methods …
The mine tailings near Taltal contained considerable amounts of copper (∼5000 ppm) and cobalt (∼115 ppm). After adaptation of the mesophilic consortium, 38% of Co and 86% of Cu were recovered in 2-L STR at 10% solid load after 12 days bioleaching at 30 °C. In a mini-pilot test in 20-L STR at 15% solid load, Co and Cu extraction reached …
Combined bioleaching with alkaline media and iron- and sulfur-oxidizing bacteria in acidic media should be a good reference for ecological Cu recovery from copper oxide and sulfide wastes. Flotation wastes are becoming a valuable secondary raw material and source of many metals and semimetals worldwide with the possibilities of industrial ...
Simulations were conducted for bioleaching of a buried 20 m height ore bed with 50 × 50 m surface area, composed by copper sulfide ore particles of 5 cm average diameter. This particle size range is achievable in underground copper mining with the application of high-energy ring blasting designs ( Cebrían et al., 2017 ).
The application of the bioleaching reaction for copper has been exploited and used to develop suitable methods to recover copper from copper-bearing solutions. Keywords. Copper Sulfide; Leach Solution; Copper Recovery; Heap Leach; Bacterial Leaching; These keywords were added by machine and not by the authors. This process is experimental …
Zinc sulphide ores can be treated by bioleaching through direct or indirect mechanism . In the direct bioleaching mechanism, Zn is extracted by direct oxidation of insoluble zinc sulfide to soluble zinc sulfate, which is catalyzed by sulfur-oxidizing bacteria (SOB) such as Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans, as ...
Effects of residues produced by agricultural wastes fermentation (AWF) on low grade copper sulfide ores bioleaching, copper recovery, and microbial community were investigated. The results indicated that adding appropriate bulk of AWF made contributions to low grade copper sulfide ores bioleaching, which may be mainly …
Bioleaching is the metal-extracting practice from sulfides and/or iron-containing ores by means of microorganisms. It is a specified biohydrometallurgical approach in which either the metabolic activities or microbe's products are used to convert insoluble compounds into soluble form, which can then be recovered later [].Biological …
Compared with the traditional pyrometallurgical process, copper bioleaching has distinctive advantages of high efficiency and lower cost, enabling efficiently extracts …
In this study, column bioleaching of low grade copper sulfide was carried out at different temperatures after inoculation with mesophiles, moderate thermophiles and extreme thermophiles. The microbial diversity and dynamics of predominant species in the leachates and on the ore surfaces of different portions of the column during bioleaching ...
The most successful copper heap leaching operations have been those processing copper oxides and secondary copper sulphides (Table 1).Chalcocite (Cu 2 S) is the main copper sulphide mineral mined at bioleaching operations. Some of the chalcocite heap operations began as oxide (chemical) leach operations and were converted to …
Column bioleaching experiments were performed with low-grade secondary copper sulfide ore from Zijinshan. To simulate leaching, several variables such as irrigation solution, leachate treatment (with or without recirculation), irrigation duration, temperature and pH were considered for the evaluation of the copper recovery and iron extraction.
Introduction to Bioleaching: Leaching process was first observed in pumps and pipelines installed in mine pits containing acid water. This process was later on employed for recovering metals from ores containing low quantity of the metal. Presently certain metals from sulfide ores and other ores are extracted by employing only leaching method.
Bioleaching is a mature technology, which is widely employed commercially in the leaching of primary sources of metals (ores, concentrates, and mine residues). The current work discussed the effects of aluminum sulfate additions to the growth medium, PLS recirculation and bleeding on the column bioleaching of secondary copper sulfide ores …
The commercial application of copper bioleaching, an environmentally-friendly approach for low-grade and secondary mineral resources recycling, has increased worldwide since the 2000s. As the world's second-largest economic entity and the largest developing country, China has the largest demand for metal resources, significantly advancing the theory and …
