Investigation of the leaching of chalcopyritic ore in acidic solutions
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.
Chalcopyrite leaching in novel lixiviants
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 …
(PDF) Sulphuric acid leaching of uranium ore …
pr ese nce of 0. 2 g/l MnO 2 could result in uranium leaching. effi cien cy of about 87%. The leachin g kinetic s of ura-. nium showed that the rate of ur anium leaching using. sul phur ic acid in ...
Leaching of ilmenite to produce titanium based materials: a …
Optimal acid/ore ratio for ilmenite leaching was determined to be 2:1 (w/w) at an optimal reaction time of 3 h. Generation of a large amount of sulfuric acid waste is a drawback of the sulfuric acid process. ... As with weak acids, leaching in alkaline medium also extracts comparatively more titanium than iron, but requires an additional acid ...
Kinetics and mechanism of hydrochloric acid leaching of …
Kim et al. (2014) studied the leaching kinetics of La in sulfuric acid using the REE slag obtained from the pyrometallurgy of magnetite ore mixed with monazite. The results revealed that the leaching process of La is divisible into two stages according to the shrinking core model, namely the chemical reaction and diffusion through the ash layer.
Selective extraction of uranium from uranium–beryllium ore by acid leaching
Effect of H 2 SO 4 concentration. Sulfuric acid, as the leaching agent, is a key factor influencing the leaching efficiency of U. The effect of H 2 SO 4 concentration on U leaching was demonstrated in Fig. 1, with the other conditions fixed at: the leaching temperature of 348.5 K, the liquid–solid ratio of 4:1 and the leaching time of 50 min.The …
Pore structure evolution characteristics of sandstone …
Pore structure evolution characteristics of sandstone uranium ore during acid leaching - ScienceDirect. Volume 53, Issue 12, December 2021, Pages 4033-4041. …
Application of leached iron ore tailings to produce
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 ...
Phosphoric Acid Leaching of Ni–Co–Fe Powder Derived …
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.
Removal of iron from acidic leach liquor of lateritic nickel ore …
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 ...
A Review on the Research of Hydrometallurgical Leaching of …
Nitric acid is both a strong acid and a strong oxidant, and is widely used in the leaching of copper sulfide ore. However, the nitrogen oxides produced during the leaching process of nitric acid are not easy to recover. Therefore, the economic and environmental friendliness of leaching copper with nitric acid is poor.
Effect of Magnesium on Pressure Leaching of Moa Laterite Ore
Abstract. The magnesium content of laterite ore has a significant impact on the quantity of sulphuric acid required to achieve the target nickel extraction by the high pressure acid leach (HPAL) process, both through direct consumption of acid when magnesium-bearing minerals are dissolved and through "buffering" effects via bisulphate …
Sulphide Leaching
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 ...
Heap Leaching
The copper heap leaching, solvent extraction, and electrowinning process has revolutionized the copper industry and significantly reduced the capital and operating costs for the production of copper from low-grade ores.A schematic of a typical heap leach/SX/EW operation is shown in Fig. 4.29.The SX part of the flowsheet recovers …
The Use of Acid Leaching to Recover Metals from …
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 …
Evolution of pore structure and reactive transport
During the acid leaching of sandstone uranium ore, complex chemical reactions occur at the solid-liquid interface. These reactions encompass erosion reactions that generate …
Kinetics Study of Leaching Ore Nickel Laterite Using Hydrochloric Acid
This research aimed to study the effect of temperature, acid concentration, and leaching time on nickel extraction percentage and the leaching kinetics. Hydrochloric acid (HCl) was used as a ...
Removal of phosphorus from iron ores by chemical leaching
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 …
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 …
Recent Progress in Hydrometallurgical Processing of …
Hydrometallurgical techniques such as heap leaching (HL), atmospheric leaching (AL), high-pressure sulfuric acid leaching (HPAL), Caron process, and direct …
Metallurgy
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, …
Thermal and Mechanical Activation in Acid Leaching …
The acid leaching is known as the most efficient in which thermal and mechanical activation are included for improving the performance of the process.
In Situ Leach Mining of Uranium
Otherwise, acid (sulfate) leaching is generally better. In this case the leach solution is at a pH of 2.5-3.0, about the same as vinegar. Acid leaching gives higher uranium recovery – 70-90% – compared with 60-70% for alkaline leach, and operating costs are about half those of alkaline leach.
Leaching and solvent extraction purification of zinc from …
An integrated hydrometallurgical process was used for the zinc leaching and purification from a zinc ore containing 9.75 wt% zinc. ... 22.05% sulphuric acid concentration, and the leaching ...
Recovery of gold from sulfide refractory gold ore: Oxidation …
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 ...
High pressure acid leaching of a refractory lateritic nickel ore
Highlights Leaching temperature, leaching duration, sulfuric acid to ore weight ratio and particle size of the limonitic nickel laterite ore were studied. Optimum parameters determined as 255 o C, 0.30 sulfuric acid to ore weight ratio, a particle size of −850μ, 1 h of leaching duration with 30% w/w. 87.3% of Ni and 88.8% of Co in the …
Gold leaching from ores using biogenic lixiviants – A review
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 …
Purification of a Nigerian talc ore by acid leaching
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.
Acid leaching | industrial process | Britannica
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…
Sulfuric acid leaching for capturing value from copper rich …
Typical copper electrolyte solution produced from leaching of copper ore, contains 25–60 g/L of copper and 0.1–10 g/L of iron in the electrowinning stage (Evans, 2003; ... Sulfuric acid leaching of copper rich slag with the optimized parameters can provide a copper rich process solution with iron as the main impurity metal. The solution …