Acidity influence on dissolvability of treated ore is such that iron and aluminium are the most present in solution where their concentrations in solution are increased with an increase of leaching time. Concentrations of iron and aluminium are in limits of 0.47–2.66 and 0.61–2.56 g/dm 3, respectively.
Leaching of gold and silver from the gold-bearing ore using amino acids of microbial origin (reproduced from Groudev et al., 1999). Pintail's research in Colorado (USA), in partnership with the Science Applications International Corporation (SAIC), proposed the BioLix TM process to extract gold and silver using biologically derived …
Hydrometallurgical techniques such as heap leaching (HL), atmospheric leaching (AL), high-pressure sulfuric acid leaching (HPAL), Caron process, and direct …
During the acid leaching of sandstone uranium ore, complex chemical reactions occur at the solid-liquid interface. These reactions encompass erosion reactions that generate …
Other articles where acid leaching is discussed: uranium processing: Leaching: Acid leaching is commonly performed by agitating an ore-leach mixture for 4 to as long as 48 hours at ambient temperature. Except in special circumstances, sulfuric acid is the leachant used; it is supplied in amounts sufficient to obtain a final leach liquor at about…
The limonitic ore, which accounts for 67% of the total, is a nickel and cobalt co-associated deposit as well as a high-quality iron ore resource. The high-pressure sulfuric acid leaching (HPAL) technique is now the most widely used method for processing limonitic laterite ore.
Metallurgy - Leaching, Extraction, Refining: Oxides are leached with a sulfuric acid or sodium carbonate solvent, while sulfates can be leached with water or sulfuric acid. Ammonium hydroxide is used for native ores, carbonates, and sulfides, and sodium hydroxide is used for oxides. Cyanide solutions are a solvent for the precious metals, …
Hot acid leaching applied to iron ore tailings is a technically feasible alternative that enables the maximum use of natural resources. The ferric liquor can be used as a coagulant in water and wastewater treatment and as a precursor for the synthesis of pure iron oxides. The solid phase, insoluble in hydrochloric acid, may contain silica ...
For analyzing the mechanism of rare earth leaching by citric acid and exploring the influence of the leaching process on the properties of IAREO minerals, the minerals before and after leaching were analyzed by XRD, FT-IR, and SEM-EDS. Fig. 10 shows the XRD pattern of the original ore and the leaching residue from the citric acid …
In short, acid leaching is used widely in sandstone-type uranium deposits in many countries because of its high uranium leaching efficiency and low cost of leaching solution production [[9], [10], [11]]. During the acid-leaching process, the fluid characteristics of uranium-bearing sandstones are different from those of conventional …
See more on britannica
Pore structure evolution characteristics of sandstone uranium ore during acid leaching - ScienceDirect. Volume 53, Issue 12, December 2021, Pages 4033-4041. …
Under the conditions of the ratio of mixed acid of 5 mol/L HCl + 1 mol/L HF, leaching temperature of 353.15 K, and leaching time of 12 h, the SiO 2 purity of high-grade silica reached 99.51%, and the removal efficiency of Fe, Al, Mg, and Ca from quartz concentrate was 95.20%, 85.60%, 97.99%, and 97.19%, respectively. During the …
Alkali-leaching and acid-leaching were proposed for the dephosphorization of Changde iron ore, which contains an average of 1.12% for phosphorus content. Sodium hydroxide, sulfuriced, hydrochloric and nitric acids were used for the preparation of leach solutions. The results show that phosphorus occurring as apatite phase could be …
1. Introduction1.1. Occurrence and characteristics of chalcopyrite. Much of the world's economic copper resource occurs as chalcopyrite (CuFeS 2), commonly at low grades (≤ 0.5% Cu).Chalcopyrite is the dominant Cu ore mineral in most porphyry deposits, which make up an estimated 70% of the global Cu resource (Singer, 2017), and is also …
Operating data from aerated heaps leaching ore crushed to 12 mm (80% passing) have indicated a value for k of slightly less than 0.001 d-1 (Liu and Hashemzadeh, ... and so on. Since the ore acid consumption was not constant, neither was the acid concentration in any of the totes' effluents. Only the first tote received a constant acid …
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 …
Acid leaching (Zhang, 2018) (Wang, 2018) The inclusion in the minerals are destroyed by acid (e.g. sulphuric acid, hydrochloric acid) ... Leaching of gold from the gold ore by thiourea has been fully taken into account because of its higher leaching efficiency, low-price and faster kinetics as well as less environmental impact comparing with ...
The oxidizing action of nitric acid and nitrates can be utilized to leach sulphides, but this is seldom adopted because of costs. 4. Concentrated sulphuric acid: Most sulphides are oxidized to sulphate. From the sulphated ore, all of the zinc, copper and iron can be leached with water while lead, silver, gold and antimony will remain in the ...
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 ...
By optimizing the basic HPAL process parameters: leaching at 255°C with 0.30 sulfuric acid to ore weight ratio with a particle size of −850μ for 1h of leaching, it was found that 87.3% of ...
Besides that, Alafara et al. [8] also studied the leaching kinetic of Nigerian ilmenite ore by HCl acid. In their study, 77% of iron-ore was dissolved within 120 min at a stirring speed of 360 rpm
A study on the purification of a Nigerian talc ore by acid leaching was examined. The initial and leached talc ore were appropriately characterized. Specific surface area of the ore increased from 0.15 m 2 /g to 3.59 m 2 /g at optimal leaching. A process efficiency of 90.4% was achieved for iron removal.
When the pH is less than 2.0 and the maintenance time exceeds 8 h, which indicated that the acid consuming substances of the ore were basically completely consumed, and the residual acid of the slurry met the acidity control requirements of the acid leaching solution, then stopped adding acid and calculate the acid capacity of the …
The separation of high levels of iron from acid leaching liquor is a difficult task, especially in the atmosphere acid leaching process for laterite ore. In this paper the removal of iron by goethite precipitation from the leach liquor of reduced laterites is reported. The goethite precipitation process uses air as oxidation agent, that is, V.M ...
Abstract and Figures. The objective of this work was to compare the bioleaching with the acid leaching of uranium under similar process conditions within 65 days. The low-grade uranium ore used in ...
Acid leaching (25 g material, 250 mL HCl, room temperature, 50 days) explored pH, temperature, and particle size. Lower pH (pH < 3) led to greater metal …
Acid leaching and dissolution of major sulphide ore minerals: processes and galvanic effects in complex systems - Volume 68 Issue 2 ... Leaching and microbial treatment of a soil contaminated by sulphide ore ashes and aromatic hydrocarbons. Applied Microbiology and Biotechnology, Vol. 74, Issue. 5, p. 1135. CrossRef;
Acid Leaching. Acid leaching has the advantage of being more effective with difficult ores, requiring lower temperatures and leaching times compared to alkaline solutions. It also requires less pretreatment than …
The acid leaching is known as the most efficient in which thermal and mechanical activation are included for improving the performance of the process.
حقوق النشر © 2024.Artom كل الحقوق محفوظة.خريطة الموقع