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Enhanced bioleaching of granite-type uranium ore using an …
The column leaching experiment was divided into an acid pre-leaching phase and a leaching phase. The ore was pretreated using different H 2 SO 4 concentrations (20, 10, and 5 g/L) and finally acidified using H 2 SO 4 in the acid pre-leaching stage with a pH of 1.80. Acidizing was completed when the last three …
Ore Leaching by Bacteria | Annual Reviews
Ore Leaching by Bacteria D G Lundgren, and M Silver Vol. 34:263-283 (Volume publication date October 1980) https://doi/10.1146/annurev.mi.34.100180.001403
LEACHING OF A ROASTED COPPER SULFIDE ORE
The leaching of copper maximum in a sample was in the order of leaching of copper in three ores is as Sample C>sample D>Waziristan chalcopyrite. The experiments showed that the untreated raw oxidized copper ore show significant leaching which is 9.5% for saline and 35.5% for fertile soils respectively.
Metals Extraction from Sulfide Ores with Microorganisms: …
Currently, several catalytic agents have been used during bioleaching to enhance the metal extraction from metal sulfide ores. Such agents can decrease the …
Crushed ore agglomeration and its control for heap leach …
Highlights Crushed ore agglomeration as a pretreatment step for heap leaching is reviewed. The acceptance of binder is limited due to the lack of acid-tolerant binders. Concise overviews of quality control and characterization tools are provided. Different agglomeration-heap leaching systems are summarized. HPGR grinding …
Bioleaching of a low-grade copper ore, linking leach …
5. Summary. During the transition from oxide leaching to sulfide bioleaching (2006–2009), the Whim Creek ore supported the growth of a mixed community of acidophiles, some mesophilic and others moderately thermophilic, that oxidised iron (II) and reduced inorganic sulfur compounds and/or metabolised organic compounds.
Leaching Meaning
Leaching is a mass transfer process which takes place through the extraction of a substance from a solid material that has come into contact with the liquid. Leaching is the normal mechanism by which water-soluble compounds from soil or waste are washed out. Such leached-out contaminants affect surface and subsurface water contamination.
Features of Shaimerden Deposit Oxidized Zinc Ore Leaching
Leaching of ZnS is also thermodynamically probable, but this process proceeds preferentially at low concentrations with formation of Zn 2+, SO 2 − 4, and H 2 S, and not elemental sulfur. The region of zinc cation stability at 25°C is limited to values of pH 5.4–5.5, and at 60°C, hydrate formation commences in a more acid region (pH 4.7–4.8).
Leaching of a complex sulfidic, silicate-containing zinc ore …
To investigate the effect of particle size distribution on leaching efficiency, 1 kg of the ore was sieved and divided into several size fractions using Tyler standard sieve.The main chemical analysis of each size fraction is listed in Table 3.Analytical grade sulfuric acid (98 wt.% H 2 SO 4) was used as leaching agent in all experiments.Reagent …
Gold Dissolution from Ore with Iodide-Oxidising Bacteria
2 Altmetric. Metrics. Gold leaching from ore using iodide-iodine mixtures is an alternative to gold cyanidation. This study evaluated the ability of iodide-oxidising bacteria to solubilise gold ...
Leaching Mining Method | SpringerLink
The leaching mining method is an ore mining method in which useful components in the deposits, ores, and waste rocks are dissolved, leached, and recovered by using chemical solvents or microorganisms through the effects of chemical leaching, mass transfer, heat, and hydrodynamics, according to the physical and chemical …
Oxide Sulfide Copper Ores Leaching
The results of column leaching tests on 3 different mixed oxide/sulfide ores from a Chilean deposit are presented. The 3 samples contained different ratios of oxide copper minerals to chalcocite and chalcopyrite. The results of the column leach tests are interpreted in light of the shrinking core model for coarse particle leaching.
Pressure leaching of zinc silicate ore in sulfuric acid medium
Sulfuric acid pressure leaching of zinc silicate ore was carried out to assess the effect of particle size, sulfuric acid concentration, pressure, reaction time and temperature on the extraction of zinc and the dissolution of silica. Under the optimum conditions employed, up to 99.25% of zinc extraction and 0.20% silica dissolution are …
16.6A: Microbial Ore Leaching
Microbial ore leaching (bioleaching) is the process of extracting metals from ores with the use of microorganisms. This method is used to recover many different precious metals like copper, lead, zinc, …
Bio-processing of a saline, calcareous copper sulfide ore by …
Since leaching the separate ore fractions had shown that both contained significant concentrations of acid-leachable chloride, a preliminary 19 day leaching step using reverse osmosis (RO)-grade water (referred to as Phase 0) was included in this experiment. This was followed by a 3 day acid leaching period (using 2 L of 0.9 M …
HCl Hydrochloric Leaching of Manganese …
A nominal ore size of approximately 80 mesh (0.007 in) was used in this investigation. The HCl and CaF2 used were reagent grade. Leaching tests were performed in a 0.5-L glass kettle fitted with a …
Research on conventional leaching process and leaching
To investigate the leaching rules and mechanism of a hard rock uranium ore, this paper conducted conventional leaching experiments based on the chemical composition and mineral occurrence status of the ore. Various factors affecting leaching were explored, and experimental data were fitted using the shrinking-core model. The …
7.2A: Microbial Ore Leaching
Microbial ore leaching (bioleaching) is the process of extracting metals from ores with the use of microorganisms. This method is used to recover many different precious metals like copper, lead, zinc, gold, silver, and nickel. Microorganisms are used because they can: lower the production costs. cause less environmental pollution in …
Bioleaching: metal solubilization by microorganisms
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Enhancement of weathered crust elution-deposited rare …
WEBPQ-10 was a novel eco-friendly leaching aid in the leaching of rare earth ore. • Addition of PQ-10 reduced leaching time by 70 %. • The novel composite …
Progress in bioleaching: fundamentals and mechanisms of …
Unwanted leaching of metal sulfide-containing ores by leaching microorganisms generates acid mine/rock drainage (ARD/AMD). Improved AMD countermeasures can be developed only if the microbe-mineral interactions are …
Extraction of manganese oxide ore by a reduction acidolysis …
A process for recovering manganese from low-grade manganese oxide ore through a reduction acidolysis-selective leaching method is investigated. Two types of biomass, sawdust and straw, were used as reductants. Reduction acidolysis, using concentrated sulfuric acid, was used to disrupt the structure of the biomass, allowing the …
Recovery and preparation of high-grade silica from iron ore …
In summary, we developed an S-HGMS with coupling with acid leaching technology for recovery and preparation of high-grade silica from high‑silicon IOTs. Firstly, iron ore was mined and then processed to obtain iron concentrate and high-silica IOTs by the process of crush–grind–screening–gravity separation–magnetic separation [72]. The ...
In-place leaching of primary sulfide ores: Laboratory leaching data …
Experimental results obtained in laboratory leaching studies of primary copper sulfide ore in sulfuric acid systems pressurized with oxygen are interpreted by a computerized geometric model involving the movement of a reaction zone through the ore fragments. Physical properties of the ore, including size, shape, and mineral content, are …
Improved thiourea leaching of gold from a gold ore using …
Thiourea leaching of gold from a quartz vein type ore without the addition of additive was investigated to show the effect of leaching conditions including Fe 3+ concentration (0.02–0.05 M), thiourea concentration (0.05–0.13 M), pH (1.0–2.5), leaching time (4–7 h) and temperature (25–50 °C) on gold extraction and thiourea consumption. . …
Sulfuric acid leaching of zinc silicate ore under pressure
Acid leaching of Egyptian zinc ore from the Um Gheig area was carried out with sulfuric acid. This study determines the optimum conditions for dissolution of non-sulfide zinc ore. The optimum ...
Leaching Kinetics of Limonite-Type Laterite Nickel Ore from …
The leaching behavior of nickel and iron in limonite-type laterite nickel ore was studied through ammonium hydrogen sulfate atmospheric leaching. The leaching temperature, ammonium bisulfate concentration, reaction time, and acid excess rate during the nickel dissolution process were optimized using the response surface methodology …
Kinetics of sulfuric acid leaching of low-grade zinc silicate ore
The results of a leaching kinetics study of low-grade zinc silicate ore with sulfuric acid are presented. Effect of ore particle size, reaction temperature, and acid concentration on zinc dissolution rate were determined. The results obtained show that leaching of about 94% of zinc is achieved using −200+270 mesh ore particle size at a …
A fresh approach to sulfide ores
A smelting workaround. The traditional route for extracting copper from sulfide ores is smelting. Yet there is a growing case for leaching sulfides from lower grade ore bodies and especially for those ore bodies containing problematic elements like arsenic, which make smelting less economical. Smelting is increasingly expensive …
Sulfuric acid leaching of zinc silicate ore under pressure
Effect of L/S. The ore (− 98 + 74 μm) was leached in solution containing 0.46 mol/L sulfuric acid for 120 min at 140 °C at different L/S ratios ranging from 6 to 10. The obtained data plotted in Fig. 7 show that L:S ratio affected significantly the leaching recovery of iron and silica but zinc slightly.
Leaching of rare earths from fine-grained zirconosilicate ore
Leaching of rare earths Y, La and Ce by sulphuric acid from fine-grained zirconosilicate ore was investigated using Taguchi method of experimental design. An orthogonal array of L 8, 2 7 which denotes 7 factors at 2 levels was chosen to consider the various factors relevant to the leaching process: baking time, baking temperature, acid …
Microbial Ore Leaching | Basic Sciences
Language: English. A lecture about Microbial ore leaching, the process in which microorganisms are used to extract metals from ores. The video was …
Kinetics of Sulfuric Acid Leaching of Low-Grade Zinc Silicate Ore
Abstract. The results of a leaching kinetics study of low-grade zinc silicate ore with sulfuric acid are presented. Effect of ore particle size, reaction temperature, and acid concentration on ...
Geological and mineralogical study of ore tailings for bio-leaching
When the content of the main copper ore component in tailing dump is about 0.1-0.3%, the total geological reserves of metals can be at least 2.0 million tons. More than 630 million tons of ground ...
Leaching: Process, Types, Methods, Advantages, …
Advantages of the leaching process. The method is simple to carry out, and it aids in the greater extraction of metals and minerals from ore. There is less energy needed. It has a lower environmental impact than other mining technologies. The leaching chamber is easily transportable to the excavated trench.
In-place leaching of primary sulfide ores: Laboratory …
A. E. Lewis & M. E. Wadsworth. 335 Accesses. 53 Citations. Explore all metrics. Abstract. Experimental results obtained in laboratory leaching studies of primary copper sulfide …
Bioleaching of cobalt from an arsenidic ore
Arsenic is one of the main contaminants in soil, especially in (former) mining areas, but arsenic can also be a source of exploitable metals, if present as arsenides. In the following paper we report the microbial leaching of an arsenide (e.g. safflorite (CoAs 2 )) for the first time. Bioleached cobalt yielded up to 92% in presence of citric ...