patent us4497778 microbial leaching of sulphidecontaining ores
Microbial recovery of metals from solids
Microbially produced sulfuric acid acted as leaching agent. pH decreased during the growth period from approximately 10 to about 1. Biohydrometallurgical processing of fly ash poses serious problems especially at higher pulp densities, because of the high content of toxic metals and the saline and strongly alkaline (pH10) environment.
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high temperature separator heap leaching
As the ore is mainly oxide, heap leaching is preferred but as Frank clearly pointed it out lab or pilot. US8070851B2 Chloride heap leaching Google Patents A heap leaching method to recover copper from a primary copper sulphide mineral wherein the mineral is leached in an acidic chloride/sulphate solution in the presence of oxygen with the
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v116n6a5 Optimization of circuits for pressure leaching of
low-grade ores, as well as impurities such as arsenic and antimony. Alternative hydrometal-lurgical routes to treating chalcopyrite are therefore required. One option is pressure leaching, which is the focus of this work. In the pressure leaching process, sulphide ores and concentrates are leached in autoclaves at temperatures of 200 to 220C
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ore processing sulfide gold processing high frequency
ore processing sulfide gold processing high frequency [email protected] +(86) 150 2750 8176 Position synergistic effect Inquire Now Patent US4497778 Microbial leaching of sulphide . A fundamental study of the alkaline sulfide leaching of gold. The European Journal of Mineral Processing and Environmental Protection Vol.3, No.3, 1303 0868
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Insights into Ferric Leaching of Low Grade Metal Sulfide
The distribution of the metal-bearing mineral grains within a particulate ore prepared for leaching, and the impact of this spatial heterogeneity on overall extraction efficiency is of key importance to a mining industry that must continuously target ever-reducing grades and more complex ore bodies. If accessibility and recovery of the target minerals is to be
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Our Publications
Dziony, W., Koepke, J., Holtz F. (2008): Data report: Petrography and phase analyses in lavas and dikes from the hole 1256D (ODP Leg 206 and IODP Expedition 309, East Pacific Rise
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Tamsin Senders (nee Williams)
A method for the adaptation of bacteria for use in the leaching of ores and concentrates, including the steps of: a) obtaining samples of bacteria exhibiting one or more desired attributes; and b) combining bacterial samples from step a) with a stock bacterial culture known to have the ability to oxidise sulphide minerals, whereby the resulting
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Microbial leaching of metals from solid industrial wastes
04.01.2014The process is environmentally-friendly, economical and cost-effective. The major microorganisms in recovery of heavy metals are acidophiles that thrive at acidic pH ranging from 2.0–4.0. These microbes aid in dissolving metals by secreting inorganic and organic acids into aqueous media.
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Bacteria accumulate silver during leaching of sulphide ore
15.04.1982Abstract. Silver is extremely toxic to a wide range of bacteria 1–5, and has even been used in solution to control bacterial growth 2. In an investigation of the oxidation of several sulphide
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Extraction of metal values from ores or concentrates
A process is described for leaching ores or concentrates containing one or more metallic sulphides .with a circulating liquor so as to solubilize desired metal values therefrom, if said metal values are capable of dissolution in an acidic ferric sulphate solution (e.g. copper), or so as to render the desired metal values (e.g. gold) more accessible to subsequent
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Method used for the concentration of sulphide ore is
It is used for selectively separating hydrophobic material from hydrophilic. This method is used for that metals whose ore gets preferably wetted by the oil and the gangue by the water. The sulphide ores are preferably wetted by the oil and the gangue with water. Hence, this method is suitable for the concentration of the sulphide ore.
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Status and Prospects
In bio-mining, the ores are "leached". Bio-leaching is the biological conversion of an insoluble metallic compound into a water-soluble form. In the case of the bio-leaching of metal sulphides, these are oxidized in acidic solution by acidophilic aerobic FE(II) and/or sulphur-compound oxidizing bacteria or archaea to metal ions and sulphate.
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(PDF) Fungal and Bacterial Bioleaching Studies On Bauxite
13.07.2015leaching.Bioleaching is the extraction of specific metals from their ores through the use of micro-organisms such as bacteria and fungi.Bioleaching (bacterial oxidation) was first used in
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ᐅ Unsere Bestenliste Nov/2022 - Ultimativer Produktratgeber TOP Nici qid Aktuelle Schnppchen Alle Preis-Leist
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Methods of Metal Recovery by Microorganisms (2 Methods)
1. Bioleaching or microbial leaching: This broadly involves the extraction or solubilization of minerals from the ores by the microorganisms. 2. Bio-sorption: ADVERTISEMENTS: It deals with the microbial cell surface adsorption of metals from the mine wastes or dilute mixtures. Method # 1.
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Bioleeching
10.10.201718. Microbial leaching of refractory process metal ores to enhance gold and silver recovery is one of the promising applications Gold is obtained through bioleaching of arsenopyrite/pyrite Silver is also obtained by bioleaching of arsenopyrite but it is more readily solubilized than gold during microbial leaching of iron sulphide. 19.
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Leaching, Washing, Or Dissolving Patents and Patent
Abstract: A process is provided for hydrometallurgical processing of steel plant dusts containing cadmium, lead, zinc, and iron values, along with impurities such as chloride and fluoride salts of sodium, potassium, magnesium, etc. The first step in the process involves leaching the dust in a mixed sulfate-chloride medium that dissolves most of the zinc and cadmium.
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Microbial Leaching of Copper from Tailings of Low Grade Sulphide Ores
In this study, mixed culture consisted of six iron and sulfur oxidizing microorganisms were used in leaching of flotation and acid-leaching tailings obtained from Zambia sulfide ores. The result showed that 62.7% and 61.7% copper were dissolved by bioleaching, while 53.8% and 57.4% by acid leaching in flotation and acid leaching tailings
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Bacterial leaching of ores and other materials
Microbial leaching of ores depends primarily on bacterial processes which are the essential causes of natural weathering of sulfidic minerals. If sulfidic heavy metal minerals come into contact with air and water they begin to decay with the formation of sulfate, sometimes sulfuric acid, and water soluble heavy metal cations.
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Effect Particle Size on Leaching of Sulphide Minerals
02.09.2018This implies that terminal growth of the bacteria corresponds to a pH value of approximately 1.3 indicating that the maximum bacterial activity is within the pH range of 2.0 to 1.3. The results presented in this study have demonstrated that, although the mass median particle size has been varied from 19 to 60 m the leaching characteristics
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Progress, Challenges, and Perspectives of Bioleaching for
leaching is a low-cost, green technology for leaching metals from a variety of minerals and waste materials [10]. In the early 1950s, Colmer was the first to extract copper from a mine dump at the Kennecott Copper Corporation using microorganisms [11]. Thus, bioleaching technology opened the era of microbial metallurgy. Biological leaching
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