Nigeria is rich is solid mineral resources, such as: Kaolin, gypsum, mica, clay, tantalite, iron ore, gemstone, silica sand.
Read More
Recycling concrete &building rubble is not only able to bring profit to investors, but also good for environment protection.
Read More
By absorbing the advanced technology from the world, we researched and designed PF series impact crusher.…
Read More
Base on the plentiful experience of producing and marketing of impact crusher, Sofol R&D institution…
Read More
Adopting technology from the world, PY Series spring cone crusher has an excellent performance in secondary…
Read More
The vibrating screen is a kind of sieving equipment of international advanced level, developed by our…
Read More
Sofol VSI Series vertical shaft impact crusher is designed by reputed German expert of Sofol and every…
Read More
– A Case Study of Copper Leaching at 1km Depth" by M. Bomberg et al. Semantic Scholar extracted view of "Indirect in situ Bioleaching is an Emerging Tool for Accessing Deeply Buried Metal Reserves, But Can the Process be Managed? – A Case Study of Copper Leaching at 1km Depth" by M. Bomberg et al.
Details
Bacterial assisted leaching processes are based on the ability of certain microorganisms to solubilize/or expose the metals contained in the ores and concentrates by direct oxidation, or through ...
Details
Schippers A, Sand W (1999) Bacterial leaching of metal sulfides proceeds by two indirect mechanisms via thiosulfate or via polysulfides and sulfur. Appl Environ …
Details
Bacterial leaching, the biooxidation of metal sulfides to soluble metal sulfates and sulfuric acid, is effected by specialized bacteria. Three species of mesoacidophilic, chemolithotrophic bacteria are mainly involved: Thiobacillus ferrooxidans, Thiobacillus thiooxidans, and Leptospirillum ferrooxidans.T. ferrooxidans oxidizes reduced sulfur …
Details
The acid-insoluble metal sulfides FeS 2, MoS2, and WS2 are chemically attacked by iron(III) hexahydrate ions, generating thiosulfate, which is oxidized to sulfuric acid, explaining leaching of metal sulfide by Thiobacillus thiooxidans. ABSTRACT The acid-insoluble metal sulfides FeS2, MoS2, and WS2 are chemically attacked by iron(III) …
Details
2. Heap Leaching. In this technique, the ore is arranged in large heaps. During heap leaching, an aqueous mixture of microorganisms is sprinkled over the leach pile. Then, the solution is collected and processed to …
Details
The microbial leaching process was evaluated for the treatment of synthetic sediments contaminated with cadmium and nickel sulfides to compare metal solubilization in sediment inoculated with Acidithiobacillus ferrooxidans -inoculated sediments to that in sterile control sediment, indicating that indirect non-contact leaching by the products of …
Details
The unique hydrofracking-bioleaching in situ pilot plant applied indirect leaching of copper with ferric iron lixiviant, i.e., the acidophilic microorganisms were contained in a Ferric Iron Generating Bioreactor (FIGB) on site at 1 km depth, into which the reduced iron solution after Cu recovery was directed for reoxidation by an iron oxidizing ...
Details
For this process, the term bio-oxidation is used because the solubilized metals such as iron and arsenic are not of economic value. ... Schippers A. (Bio)chemistry of bacterial leaching – direct vs. indirect bioleaching. Hydrometallurgy. 2001; 59:159–175. [Google Scholar] Sanhueza A, Ferrer IJ, Vargas T, Amils R, Sánchez C. Attachment of ...
Details
Bacterial leaching, the biooxidation of metal sulfides to sol- ... indirect thiosulfate mechanism. In leaching experiments with L. ferrooxidans and FeS 2 the same sulfur compounds resulted
Details
In practice, multiple patterns of bacterial leaching coexist, including indirect leaching, contact leaching and a recently discovered cooperative (symbiotic) leaching …
Details
The bacterial consortium of Gallionella sp., Acidithiobacillus sp., and Leptospirillum sp. was used to extract Cu from PCBs. Also, metals like Zn can be extracted using bioleaching techniques and both direct and indirect leaching techniques can …
Details
On the other hand, in indirect bioleaching, the bacteria produce a leaching agent that chemically oxidizes the sulfide ore. In an acid solution, this leaching agent could be Fe 3+ . An example of direct bacterial leaching is the oxidation process of pyrite to iron (III) sulfate, according to the reactions below :
Details
Indirect carbonation as an efficient CO2 sequestration strategy has received extensive attention in recent years. This study proposes a two-step leaching indirect carbonation process using NH4Cl and CH3COOH in order to combine the advantages of the two leaching agents to obtain a better experimental outcome. The experimental …
Details
During the bioleaching process, microbes generate energy by oxidising sulfur and iron from sulfide minerals. The resulting oxidants attack the sulfide minerals, …
Details
The metals present in sulfide minerals are liberated by direct and indirect bacterial leaching mechanisms. Direct mechanism of microbial leaching Direct …
Details
Dissolution of sulfide ores requires oxidative leaching conditions, then ISR can be conducted by applying bacterial leaching, a technology which is established in the copper industry for the treatment of copper sulfide ores in heaps and dumps (Ghorbani et al., 2016; Petersen, 2016).Therefore, the choice of the permeability stimulation approach …
Details
An additional process of 'cooperative leaching' has also been described, whereby some free-living bacteria oxidise sulfur species ... (Bio)chemistry of bacterial leaching - direct vs. indirect bioleaching. Hydrometallurgy 59, 159–175 10.1016/S0304-386X(00)00180-8 [Google Scholar] 63. Jones S. (2022) Prokaryotic Dissolution of ...
Details
In the 'indirect' mechanism bacteria oxidize only dissolved iron (II) ions to iron (III) ions and the latter can then attack metal sulfides and then be reduced to iron (II) ions. The 'direct'...
Details
Mostly bacteria and fungi can be engaged for this purpose. The bacterial assisted microbial leaching is called "bacterial leaching" and the term "fungal leaching" is applied for microbial leaching supported by fungi. Figure 1 shows some of the most commonly used micro-organisms in the microbial leaching process. Depending upon …
Details
Learn about the diverse applications and impacts of microbial research in this peer-reviewed journal of ASM.
Details
The maximum Al leaching percentage (54.5%) was achieved using biogenic acids with stationary-phase bacteria at a TWC pulp density of 5% w/v whereas bacteria-free biogenic acid (23.4%), biogenic ...
Details
According to equation 3, iron is dissolved through direct bacterial leaching. In addition to this leaching process performed only by micro-organisms, there is another process, 'indirect, bacterially supported leaching', which takes place slowly in the absence of microbes. The oxidation of pyrite can be used as an example.
Details
Understanding and application of bacterial leaching of metal sulfides has developed rapidly in the course of the last two decades. The mobilization of metal …
Details
Schippers A, Sand W. Bacterial leaching of metal sulfides proceeds by two indirect mechanisms via thiosulfate or via polysulfides and sulfur. Appl Environ …
Details
Direct versus indirect bioleaching W. Sand, T. Gehrke, P.-G. Jozsa, and A. Schippers Universit~it Hamburg, Institut fitr Allgemeine Botanik, Abteilung Mikrobiologie, Ohnhorststrage 18, D-22609 Hamburg, Germany Phone/Fax: 040/82282-423, e-mail: [email protected] Bioleaching of metal sulfides is effected by bacteria like Thiobacillus …
Details
The data indicate that thiosulfate, trithionate, tetrathionates, and disulfane-monosulfonic acid are key intermediate sulfur compounds in oxidative pyrite degradation, and a novel (cyclic) leaching mechanism is proposed which basically is indirect. In the case of pyrite bioleaching by Leptospirillum ferrooxidans, an organism without sulfur …
Details
Leaching. The fragmented particles may contain a lot of water-soluble nutrients which are inorganic in nature. These nutrients get dissolved in the water and seep into the soil and get precipitated in the process of leaching. ... This process is carried out by various fungal and bacterial enzymes by the process of catabolism. Humification.
Details
Bacterial Leaching of Metal Sulfides Proceeds by Two Indirect Mechanisms via Thiosulfate or via Polysulfides and Sulfur AXEL SCHIPPERS* AND WOLFGANG SAND Abteilung Mikrobiologie, Institut fu¨r Allgemeine Botanik, Universita¨t Hamburg, D-22609 Hamburg, Germany Received 20 July 1998/Accepted 22 October 1998 The acid …
Details
Bacterial Leaching of Metal Sulfides Proceeds by Two Indirect Mechanisms via Thiosulfate or via Polysulfides and Sulfur Schippers, Axel; Sand, Wolfgang; Abstract. Publication: Applied and Environmental Microbiology. Pub Date: January 1999 DOI: 10.1128/AEM.65.1.319-321.1999 ...
Details
Sofol is a well-known crusher and grinding mill manufacturer that offers equipment and solutions for customers from aggregates, mining and mineral grinding industry.
You can leave your message here, we'll send you an Email immediately.
Online ChatCopyright ©2000- 2024 Shanghai Sofol CompanySitemap
PE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
GET QUOTE