•. The EMR leachate was reused for the leaching step of rhodochrosite ore. •. Battery-grade manganese sulfate was prepared from the secondary leaching …

The factors that affected the sulfuric acid leaching of the manganese nodules in the presence of various surfactants were investigated. The effect of anionic (SDS-Sodium Dodecyl Sulphate), cationic (CTAB-Cetyl Trimethyl Ammonium Bromide) and nonionic (Triton-X 100) surfactant on the various metals extraction with respect to …

Extraction of Mn from manganese oxide ore via sulfur-based reduction followed by acid leaching has received much attention. In this study, the mechanism on reducing manganese oxide ore with elemental sulfur was investigated. The reduction of manganese dioxide by sulfur is feasible thermodynamically, and the experimental …

Additionally, the reported studies on the sulfuric acid leaching with MnO 2 as oxidant only dealt with samples containing low concentration of selenides/tellurides, and the leaching behavior of manganese from the oxidant is often ignored (Hait et al., 2002, Hait et al., 2004; Xiao et al., 2018, Xiao et al., 2019).

Experimental results have shown that the leaching rate of manganese can reach 92.1% with the optimized conditions including a sulfuric acid concentration of 3.5 mol/L, a DDGS to pyrolusite ratio of 0.4, a liquid–solid ratio of 3 mL/g, a temperature of 363K, a time of 3 h, and a rotation speed of 400 rpm.

As a result of leaching, 10–60% of the solid phase was leached, depending on the concentration of sulfuric acid: 0–0.5 mol∙L −1. Leaching with dilute sulfuric acid (0–0.25 mol∙L −1) causes the majority of zinc, up to approx. 90%, to dissolve while maintaining a minimum manganese dissolution, not more than 1%. Increasing the ...

In the present study, a sulfuric acid leaching process in the presence of manganese(IV) oxide (MnO2) as oxidant and graphite as catalyst has been developed to augment metal recoveries from CAS.

However, organic reducing agents are rarely reported. Aniline is a typical organic reducing agent. It is known to react with manganese dioxide in sulfuric acid solution (Noller, 1965): 2 C6H5NH2 + 3 Mn02 + 5 H2S04 = 2 C6H402 + 3 MnS04 + 2 NH4HS04 + 2 H20 (1) Therefore, aniline should act as reducing agent for the acid …

The results of the leaching experiments showed that 97% and 96% of the nickel and cobalt can be dissolved in the leaching step while leaving 92% of the manganese in the residue using 1.0 mol/L sulfuric acid solution at 25 °C, a slurry density of 100 g/L and leaching duration of 2.5 h.

In the following study, acid digestion of a manganese concentrate followed by water leaching was investigated. Sulfuric acid was used for digestion due to its cheapness and availability. The concentrate was composed of pyrolusite, manganite, quartz, goethite, and lime. Manganese and iron contents of the concentrate were …

manganese reductive leaching from low-grade pyrolusite ore obtained from Shandong, China, in sulfuric acid solution was conducted using pyrolysis-pretreated sawdust as a re-ductant. The main aim was to investigate the effects of the dosage of pyrolysis-pretreated sawdust as a reductant for pyrolusite ore, the concentration of sulfuric acid, the ...

Efficiency and sustainable leaching process of manganese from pyrolusite-pyrite mixture in sulfuric acid systems enhanced by microwave heating. Shunda Lin, Lei …

Using sulfuric acid as the leaching agent, manganese can be leached from the roasted products. However, MnS is formed during the roasting and harmful H 2 S gas …

In this study, corncob was used as reductant for sulfuric acid leaching of manganese ore from Daweezi, Upper Mohmand Agency, Pakistan. X-ray diffraction of representative powdered samples revealed … Expand. 13. PDF. 3 Excerpts; Save. Reducing agents in the leaching of manganese ores: A comprehensive review.

Abstract: Manganese (Mn) leaching and recovery from low-grade pyrolusite ore were studied using sulfuric acid (H2SO4) as a leachant and pyrolysis-pretreated sawdust as …

A 97.43% leaching ratio of manganese was obtained from the roasted ore, which was leached by a 1.5 mol/L concentration of sulfuric acid at a 50°C leaching temperature, 50 rpm stirring speed and a ...

The effect of stirring speed on the manganese leaching from EMAS was studied in the range of 200–700 r/min, other leaching conditions were samples particle size range of 58–74 μm, initial sulfuric acid concentration 7.0 mol L −1, mass ratio of elemental sulfur to EMAS (S 0 /EMAS) 0.2, temperature 353 K.

Manganese recovery from industrial ore processing waste by means of leaching with sulfuric acid was the objective of this study. Experimental conditions were optimized by multivariate experimental design approaches. In order to study the factors affecting leaching, a screening step was used involvin …

This study focuses on characterizing a manganese sludge and investigating its behavior during sulfuric acid leaching. The influence of process conditions, including …

Effect of sulfuric acid concentration on the leaching efficiency of manganese. Relationship between 1-23X-(1-X)2/3 and leaching time at various weight ratios of PAP to MDO. +5

Sulfuric Acid Leaching of Manganese. Sludge. Materials 2023, 16, 4591. https://doi/10.3390/ ma16134591. Academic Editor: Daniela Fico. Received: 26 May …

Figure 7a shows the effect of leaching time to the recovery of manganese and iron, including their separation factor at room conditions (tannic acid 40 g/L, sulfuric acid 0.5 M, particle size 53–74 μm, and liquid-solid ratio 5 mL/g), which reveals the maximum recovery of Mn was attained after 6 h. In the case of Fe, the recovery gradually …

We get the oxygen moiety of the manganese dioxide suddenly oxidized to gaseous oxygen, while the manganese gets reduced from +4 to +2. The sulfuric acid is apparently unperturbed: its proton $ce{H+}$ and its $ce{SO4^{2-}}$ parts remain the same in terms of their oxidation states.

W) and sulfuric acid concentration (C H) on the leaching efficiency of manganese were studied. The leaching efficiency of manganese based on the shrinking core model was found to be controlled by diffusion through the ash/inert layer composed of the associated minerals. The apparent activation energy is 15.18 kJ mol 1. The experimental ...

The total manganese content present in the waste is 24.76%, from which 13.71% correspond to rhodocrosite and birnessite, which are soluble in sulfuric acid. The application of multivariate experimental designs was of great importance for the determination and optimization of experimental conditions for leaching the waste with …

In this study, a hydrometallurgical process was adopted for the comprehensive recovery of nickel, manganese, cobalt and lithium from sulfuric acid leaching liquor from waste cathode materials of spent lithium-ion batteries. First, nickel ions were selectively precipitated and recovered using dimethylglyoxime reagent.

Manganese (Mn) leaching and recovery from low-grade pyrolusite ore were studied using sulfuric acid (H2SO4) as a leachant and pyrolysis-pretreated sawdust as a reductant. The effects of the dosage of pyrolysis-pretreated sawdust to pyrolusite ore, the concentration of sulfuric acid, the liquid/solid ratio, the leaching temperature, and the …

The optimal leaching conditions for −88 μm particles were determined to be a sulfuric acid concentration of 2 mol L–1, a guar meal concentration of 100 g L–1, a stirring speed of 400 rpm, a ...

Unless stated otherwise, all experiments were carried out in 0.2 M sulfuric acid solutions. ... Reductive leaching of manganese from low grade Sinai ore in HCl using H 2 O 2 as reductant. Hydrometallurgy, 84 (2006), pp. 187-191. View PDF View article View in Scopus Google Scholar.

The sulfuric acid used for the leaching tests was grade P.A., ... S. Dissolution of manganese dioxide ore in sulfuric acid in the presence of. ferrous ion. Iran. J. Mater. Sci. Engi. 2007, 4, 22 ...