acid leaching ore
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.
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 ...
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 …
Reducing agents in the leaching of manganese ores: A …
The leaching kinetics of manganese from manganiferous ore in acid medium using glucose was reported by Veglio et al. (2001a). The research group evaluated a standard mathematical model (shrinking-core model) to describe the reductive acid leaching of MnO 2 by glucose and verified at low and high pulp density (10 g/L and 200 …
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 …
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 …
Pore structure evolution characteristics of sandstone uranium ore
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 …
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 ...
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.
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 …
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 …
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.
Recovery and preparation of high-grade silica from iron ore …
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 …
The effect of surfactants on the efficiency and consumption …
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 …
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 …
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…
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 ...
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 …
A novel method: Nickel and cobalt extraction from citric acid leaching
In this study, an alternative method for recovering nickel and other valuable metals from nickel laterite ores is proposed and evaluated. The proposed method comprises a leaching step using citric acid to dissolve the nickel and cobalt from Indonesian nickel laterite ores, and subsequently, an oxalate precipitation step to precipitate the nickel (and …
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.
Lithium extraction from hard rock lithium ores
After 6 h of acid leaching with 29% hydrochloric acid, the leaching rate of lithium reached 94%. Then further concentration and removal of impurities, precipitate industrial-grade lithium carbonate, and the total lithium yield was about 70%. ... The process flow is to convert lithium in ore into lithium sulfate by mixing roasting lithium ...
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 …
Research on conventional leaching process and …
Under the leaching conditions of a temperature of 50 °C, a particle size of − 100 mesh, an acid dosage of 32 kg t −1, a pyrolusite dosage of 10 kg t −1, a liquid–solid …
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 ...
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.
Hydrometallurgical Applications: Acid and Caustic …
Posted on May 6, 2021. Parr stirred reactors are widely used in hydrometallurgical applications where acid leaching of ores is the preferred method to extract metal ions. A widespread example of this …
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 …
Uranium processing
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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, …
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 ...