acid leaching sulfuric

Acid leaching | industrial process | Britannica

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 of Heavy Rare Earth Elements …

806 Sulfuric Acid Leaching of Heavy Rare Earth Elements (HREEs) from Indonesian Zircon Tailing 2. Methods 2.1. Materials and Sample Preparation Samples were obtained from zircon sand mining operations on Bangka Island and in Central Borneo, Indonesia. The extracted tailings were byproducts of the magnetic

Sulfuric Acid and Ammonium Sulfate Leaching of …

2019-7-31 · boiled with sulfuric acid with a concentration of 5–7 wt% for 60 min, alumina was extracted to 80 %. Leaching with sulfuric acid was carried out at 90oC and reached an acid concentration of 10–20 %13. Another patent reported 30 wt% as the recommended acid concentration14.

Hydrometallurgical recovery of metal values from sulfuric ...

2015-4-15 · @article{osti_22476001, title = {Hydrometallurgical recovery of metal values from sulfuric acid leaching liquor of spent lithium-ion batteries}, author = {Chen, Xiangping and Chen, Yongbin and Zhou, Tao and Liu, Depei and Hu, Hang and Fan, Shaoyun}, abstractNote = {Highlights: • Selective precipitation and solvent extraction were adopted.

Investigation of the leaching mechanism of NMC 811 …

these studies focus on the use of sulfuric acid as leaching agent whereas no paper has recently studied NMC 811 leaching in acidic chloride media in spite of its high potentialities for the next generations of LiBs. For the rst time, this paper investigates NMC 811 leaching by hydrochloric acid and identi es clearly the corresponding reactions.

Sulfuric Acid Leaching of Heavy Rare Earth Elements …

2020-10-16 · There are several ways to extract rare earth metals from their carrier minerals, such as direct leaching using sulfuric acid at temperatures of 155–230°C, alkali cracking using a sodium hydroxide solution at 140°C, roasting using sodium carbonate at 900°C, and alkaline fusion using flakes of sodium hydroxide at 400–500°C.

Pyrite in the Roasting-Sulfuric Acid Leaching Process of ...

2020-6-9 · The sulfuric acid leaching experiments were carried out in a 250 mL flask for the stone coal sample, and in a 100 mL flask for the pure pyrite sample, with a temperature-controlled rotary platform at a rotating speed of 300 rpm. The influences of the sulfuric acid concentration, the leaching temperature,

-Study on Leaching ...

Study on Leaching Mechanism of Columbite by Sulfuric Acid YANG Fan-xi 1, He Qi, Li Qiu-ju 2, Zhou Cang, Zheng Shao-bo (1.State Key Laboratory of Advanced Special Steels,Shanghai University,Shanghai;2.Shanghai University)

The sulfuric acid bake and leach route for processing of ...

2019-9-1 · The benefit of sulfuric acid pre-leaching of niobium bearing ores or concentrates was described in a patent by Walter and Verner (1963), where it was claimed to reduce acid consumption and improve the extraction efficiency of niobium in the subsequent more concentrated acid leaching step.

Thermodynamics and Kinetics of Sulfuric Acid Leaching ...

2021-3-2 · K t n = −1n (1− α) ( 1) where, k is the apparent rate constant, α is the fraction of neodymium converted (percentage/100), and t is the leaching time (min). The value of n can be calculated according to the experimental data obtained in Figure 9, and finally n = 0591 in the sulfuric acid curing process can be obtained.

Performance of Sulfuric Acid Leaching of Titanium from ...

The sulfuric acid leaching of titanium from titanium-bearing electric furnace slag (TEFS) was investigated under different experimental conditions. In the sulfuric acid leaching process, the MxTi3-xO5(0≤x≤2) and diopside could react with sulfuric acid. The optimum conditions of sulfuric acid leaching process were particle size at <

Minerals | Free Full-Text | Sulfuric Acid Leaching of ...

The kinetics of the sulfuric acid leaching of altered ilmenite, mechanisms, and process intensification methods were studied. The effect of changing the chemical composition during grinding was determined. The content of ilmenite and pseudorutile decreased from 5.3% to 3.1% and from 90.2% to 63.1%, respectively. Rutile increased from 4.5% to 28.7%, while a …

Sulfuric acid leaching of nickeliferous laterite

The leaching efficiency of nickeliferous lateritic ore is optimized by scalping the ore to remove a coarse low-nickel fraction and provide a fine nickel-rich fraction which is then high pressure leached in a sulfuric acid solution by controlling the parameters temperature, pulp density, the rate of acid addition, leaching time, agitation rate, etc., whereby a pregnant solution is obtained with ...

Sulfuric acid leaching kinetics of South African chromite

2014-6-3 · The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions. The dimensionless change in specific surface area and the conversion rate of the chromite were …

Leaching of iron from copper tailings by sulfuric acid ...

Under optimal conditions (40 °C, sulfuric acid concentration of 0.53 mol L −1, stirring speed of 400 rpm, solid/liquid ratio of 1 : 10 and leaching time of 120 min), 66.45% of Fe, along with 65.32% of Zn and 59.95% of Cu, were leached from the tailings. The leaching of iron was confirmed to be controlled by solid-film diffusion.

Sulfuric acid leaching for capturing value from copper ...

2019-4-1 · Optimal leaching conditions for higher copper recovery (ca. ) were attained at 2 M H 2 SO 4 concentration and temperature of 40 °C. Table 4 presents the concentration of the metal ions (Cu, Fe, Zn, Ni, Pb, As) in the solution after sulfuric acid leaching at the optimized conditions with leaching time of 60 and 120 min, respectively. The ...

Factors Research on the Influence of Leaching Rate of ...

2013-12-24 · ing of sulfuric acid concentration, the leaching rate of Ni and Co increase obviously. When the sulfuric acid con- centration increased to 40 wt%, the leaching rate are above 96%, while it can be seen that the increasing is . relatively slow. Therefore the optimum sulfuric acid con- centration is determined as 40 wt%.

Sulfuric acid leaching of SmCo alloy waste and separation ...

2017-12-1 · The two metals were extracted from the Sm Co alloy waste by sulfuric acid leaching, and Sm (III) was separated by sodium sulfate as a precipitate of sodium samarium sulfate. It was found that 99.9% of the Co and 24.1% of the Sm were extracted into the leach solution under the most suitable conditions: liquid-solid ratio of 6:1, leaching ...

HIGH PRESSURE SULPHURIC ACID LEACHING OF …

2016-12-27 · In high pressure acid leaching processes, lateritic nickel ores are interacted with aqueous sulphuric acid solutions in acid resistant autoclaves at temperatures of 230-270 °C and under pressures of 3.3-5.5 MPa for 60-180 minutes. Under these leaching conditions, iron mainly follow a dissolution-precipitation path, forming insoluble solid

Sulfuric Acid Leaching of High-Arsenic Dust from Copper ...

2016-7-21 · Dust samples of the following composition, wt.%, were used in sulfuric acid leaching: As 31.3, Cu 4.42, Pb 12.8, Zn 8.2, Fe 4.79, S 6.9. Data from x-ray phase analysis showed that most of the lead is in the form of PbO and PbSO 4 and that zinc is in the form of ZnFe 2 O 4, ZnO, and sulfates. Most of the arsenic is in the form of As 2 O 3 and ...

Study of Nickel Leaching Using Sulfuric Acid and ...

Study of nickel leaching using sulfuric acid and phosphoric acid on the selectivity of low-grade laterite nickel ore under atmospheric conditions has been successfully carried out. In this study, the laterite nickel leaching process was carried out …

(PDF) Acid leaching of Mixed spent Li-ion Batteries

2014-4-1 · Abstract. Acid leaching for mixed different types of spent Li-ion mobile batteries are. carried out after alkali decomposition using NH 4 OH followed by H 2 SO 4 + H 2 O 2. leaching…

Pyrite in the Roasting-Sulfuric Acid Leaching Process of ...

Acid leaching | industrial process | Britannica

Leaching Process by Sulfuric Acid Reactions

2020-6-4 · Sulfuric acid leaching of mineral rocks and concentrates containing titanium is a common method for the production of a pigment titanium dioxide. Presently, ways to intensify this leaching method are sought for using three activation methods: mechanical, thermal and chemical. The mechanical

Sulfuric acid and leaching requirements for reclaiming ...

The changes in exchangeable sodium and total dissolved salts due to the application of sulfuric acid and water to sodium-affected calcareous soils were studied for the purpose of establishing a convenient way of determining acid and leaching water requirements. Conventional methods which ignore the effect of sodium removed from soil exchange sites are inadequate for estimating amounts of acid ...

SULFURIC ACID AND LEACHING REQUIREMENTS

SULFURIC ACID AND LEACHING REQUIREMENT 577 to twice the pore volume of a 30 cm soil layer for both cases. Water-applied acid theoretically lowers the ESP more than soil-applied acid at shallow depths, but does not remove exchangeable sodium at greater depths. The TDS at shallow depths is higher for water-applied acid.

Sulfuric Acid Leaching of Smelter Matte

2017-5-28 · Sulfuric acid used in the matte leaching experiments was either a reagent- grade (95 to 98 pct H2SO4) or black acid. The black acid, obtained from a Missouri lead smelter, was produced by the Monsanto contact acid process in …

Recovery of Cobalt in Sulfuric Acid Leaching Solution ...

2018-6-2 · ABSTRACT. Oxalic acid was used for recovering cobalt from leaching solution of spent lithium ion battery by precipitation method. Crushed powders containing LiCoO 2 of spent lithium ion battery were obtained by crushing, magnetic separation and screening process. These powders were dissolved in 2 M H 2 SO 4 solution with H 2 O 2 as a reducing agent. After …

Kinetics of sulfuric acid leaching of low-grade zinc ...

2000-4-1 · Leaching of low-grade zinc silicate ore with sulfuric acid was studied. Extraction efficiency of about 94% of the zinc present in the ore was achieved under the following conditions: particle size −200+270 mesh, temperature 70°C, reaction time 180 min, acid concentration 10%, and solid:liquid ratio 1:20 g/ml.