Staged leaching behavior of red mud during dealkalization with mild acid
In this study, the leaching behavior of the major elements in red mud was carefully investigated by the treatment with a range of H⁺ concentrations from 10⁻⁶ to 1.8 mol/L. Analysis of both ...
Facile and complete sulfuric acid leaching of zinc ferrite …
Besides, leaching behaviors of zinc ferrite and copper were investigated to reveal the leaching mechanism. This work is expected to provide a facile and complete leaching technique to promote the development of advanced treatment for zinc and iron-bearing wastes. ... Compared to the hot-acid leaching system with high leaching …
Optimization of atmospheric leaching parameters for …
Selective and collective acid leaching is done to recover cadmium, zinc, nickel, lead and copper by H 2 SO 4 0.82 M 14, 97% of cadmium was obtained from 8% (v/v) of H 2 SO 4 8% (v/v) leaching 15 ...
Extraction of scandium from red mud by acid leaching …
The extraction of Sc by acid leaching with CaF 2 and solvent extraction with P507 from red mud was proposed. The influence of acid leaching and solvent extraction on recovery of Sc was investigated. The CaF 2 can obviously improve the leaching efficiency of Sc and reduce the acid consumption. The leaching efficiency of …
Leaching efficiency of sulfuric acid on selective lithium leachability
A lithium-rich bauxitic clay was selected, and its material composition, phase transformation, lithium leaching efficiency using sulfuric acid were investigated after calcination treatment. In this study, XRF, ICP-AES, ICP-MS, XRD and SEM were employed to characterize bauxitic clay and its calcining products and leaching residues.
Recovery of rare earth elements from deep-sea mud using acid leaching
The effects of acid-leaching conditions on REEs were investigated using a series of conditional experiments. The results are shown in Fig. 7 . Specifically, Fig. 7 (a) shows that when HCl, HNO 3, and H 3 PO 4 were used as leaching agents, as the acid concentration ranged from 0.5 to 3.0 mol/L, the leaching percentage of REEs increased …
Study on the Acid Leaching of Metal Components in Bayer …
Under the conditions of a sulfuric acid concentration of 25%, a reaction temperature of 90 °C, a reaction time of 150 min, and a liquid-solid ratio of 10:1, the effect of the liquid-solid ratio of red mud leaching on the leaching rate of three metals was investigated, and the results are shown in Fig. 4. Fig. 4.
Investigation of indium and other valuable metals leaching …
The influence of the organic layer was investigated by leaching front and back side samples with and without organic layer by 1 M sulfuric and nitric acid for 168 h at room temperature. ... there can be observed a higher molybdenum amount after 168 h. The nitric acid leaching process should be terminated before 72 h for optimal selective …
Microwave hydrothermal sulfuric acid leaching of spent …
The acid leaching process can be considered as a typical liquid–solid reaction, ... As depicted in Fig. S3 a, the impact of different temperatures on the leaching of CaF 2 was initially investigated. It can be found that the notable increase in the leaching rate of CaF 2 with rising temperature. At 313 K, the defluorination rate was 68.40 % ...
Zinc Extraction from Industrial Waste Residue by Conventional Acid Leaching
The variations of acid concentration on zinc leaching rate were investigated at a reaction temperature of 25 °C, liquid–solid ratio of 4:1 (mL/g), stirring speed of 400 rpm, and leaching time of 30 min. The result was shown in Fig. 4. It indicates that the zinc extraction rate increases from 26.49% to 84.97% with the increase in the …
Novel Approach for Enhanced Scandium and Titanium Leaching …
In previous studies, to tackle the gelation problem, lower solid-to-liquid (e.g. S/L = 1/50), higher acid concentration and leaching temperatures have been proposed 17,21.However, such acid ...
Water as a Sustainable Leaching Agent for the …
The results indicate that after sulfation roasting (n(H2SO4):n(Li) = 0.5, 550 °C, 2 h), 94% lithium can be selectively recovered by water leaching and more than 95% Ni, Co, and Mn can be leached through acid leaching without the addn. of redn. agent.
Sulfuric acid leaching for capturing value from copper rich …
In this research, a hydrometallurgical method for recovery of copper from copper rich converter slag is investigated. The main copper containing phases of the slag are cuprite (Cu 2 O), delafossite (CuFeO 2) and metallic copper (Cu).The study investigates the effect of particle size, temperature, acid concentration, agitation and …
Optimization and kinetic analysis of direct acid leaching of …
The acid leaching tests were performed in a 500 mL glass Erlenmeyer flask with an electromagnetic heating stirring. ... To determine the control step of the leaching process, the experiments of different temperature on the leaching efficiency was further investigated under optimum conditions.
Selective separation of aluminum, silicon, and titanium from …
The effect of oxalic acid concentration on RM dissolution was investigated with a L/S ratio of 15 mL/g at 80 °C with stirring for 2 h. ... The oxalic acid leaching process of Fe from RM using 1.0 mol/L oxalic acid, L/S ratio of 15 mL/g, at 80 °C over 2 h co-dissolved Al, Si, and Ti. The leaching efficiencies of Al, Si, and Ti from RM could ...
A novel strategy for harmlessness and reduction of copper …
Acid leaching tests were set to treat alkali disaggregated residue by diluted H 2 SO 4, ... (0.6, 0.8, 1.0, 1.2 and 1.4 M) on components leaching efficiency was investigated using 15 g alkali disaggregated residue at 90 ℃. While the different concentrations of HCl and HNO 3 were set from 0.6 to 1.8 M and 0.4 to 1.6 M, …
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…
Effective leaching of spent lithium-ion batteries using DL-lactic acid
As a result, developing a leaching process with low acid consumption, cost-effectiveness, low environmental impact, and high metal recovery is essential. ... The solid samples were investigated using X-ray diffraction (XRD, Rigaku Ultima IV), scanning electron microscopy, and energy-dispersive X-ray spectroscopy (SEM–EDS, EVO-18, …
Reductive Leaching and Recovery of Nano-crystalline MnO
In this study, tartaric acid was identified as an efficient reductant for the reductive leaching of manganese from low-grade pyrolusite ore in an H2SO4 solution. The effect of H2SO4 concentration, tartaric acid concentration, time, and temperature on the leaching efficiency of low-grade pyrolusite ore was investigated. Evidently, when taking …
Kinetic Investigation on Leaching of Copper from a Low …
the sulfuric acid leaching process to recover the copper from the otation tailings and showed that under optimal conditions, the leaching recovery was 53.8% and the total ... model, the experimental data are analyzed and investigated to identify the rate-determining step of the leaching reaction and to calculate the kinetics factors. Ultimately ...
Citric acid mediated leaching kinetics study and …
To ensure the shrinking core model behaviour for leaching of V with citric acid the activation energy associated during the mass transfer due to the metals(V, Mg and Fe) was further investigated based on the leaching kinetics date (shown in Fig. 11, Fig. 12, Fig. 13) as described below. Download : Download high-res image (411KB)
Recent Progress in Hydrometallurgical Processing of Nickel …
Hydrochloric acid leaching (HAL), phosphoric acid leaching (PAL), and nitric acid leaching (NAL) have also been explored. ... (II) rich has been investigated using NAPL . During NAPL leaching, nitric acid acts as both lixiviant and oxidant, and the process is a dissolution-oxidation–precipitation mechanism. However, the lixiviant in ...
Novel Approach for Enhanced Scandium and …
Combination of hydrogen peroxide (H 2 O 2) and sulfuric acid (H 2 SO 4) was utilized as the leaching solution, where various acid …
Leaching of copper (I) sulphide by sulphuric acid solution …
The leaching of copper from industrial copper ore with 4.8 wt % chalcopyrite by acidified nitrate with seawater based media was investigated. Water quality (pure water and seawater), temperature ...
New Insights into the Penetration Depth of Sulfuric Acid and Leaching …
The main factors on multi-stage counter-current circulation acid leaching were investigated. The factors were analyzed in terms of kinetics using the shrinking core model (SCM). The results show that the vanadium recovery could reach 86% under the conditions of sulfuric acid concn. of 4 M, liq. to solid ratio of 2 mL/g, temp. of 95 °C ...
Vanadium Leaching Kinetics from Calcification-Roasted
For the calcification roasting-acid leaching, ... The effects of leaching conditions on vanadium leaching kinetics have been systematically investigated. The (NH 4) 2 CO 3 leaching proceeds as two stages: the initial stage of 0–15 min and the long time stage of 15–75 min. In the initial stage, the leaching efficiency increased sharply ...
Leaching and selective zinc recovery from acidic leachates of …
Zinc (Zn) leaching yields and kinetics from three different zinc plant leach residues (ZLR) generated in different periods (ZLR1 > 30 years, ZLR2 5–30 years and ZLR3 < 2 years) were investigated.The factors affecting the Zn leaching rate such as solid to liquid ratio, temperature, acid concentration and agitation were optimized.
Water as a Sustainable Leaching Agent for the Selective Leaching …
The influence of the leaching temperature, the solid/liquid-ratio, the mixing rate, and the number of stages in multistage operation were investigated utilizing NCM-material. High leaching efficiencies and a high selectivity were achieved at moderate temperatures of 40 °C and a solid/liquid-ratio of 100 g L –1. In multistage operation, a ...
ELIMINATION OF LITHIUM FROM ALUMINIUM …
This paper used an acid leaching method as LiF reacts easier with acid than Li2NaAlF6. A one- step acid leaching method to remove LiF from an electrolyte with CR of 3.0 was used. The effects of the acid concentration, leaching time, liquid-to-solid (L/S) ratio and temperature on the leaching efficiency were investigated. Experimental
Process optimization for acidic leaching of rare earth
Aqua regia could solubilize almost all metallic parts of the EW sample. These EDS results also confirm Fig. 4a, which represents the highest concentrations have been achieved with aqua regia leaching. The effect of waste-to-acid ratio on the REE leaching. The final factor investigated for the leaching optimization was W:A ratio.
