Lu et al. [16] utilized formic acid as a reducing agent to recover Mn from low-grade manganese ore, and reported that the leaching rate achieved only 90.05% after reaction at 90 • C for 2.0 h ...

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.

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.

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

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 ...

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 …

effective separation of manganese from the leach liquor. The effect of phase ratio (O:A) on extraction of manganese was studied on conditions of extraction time-5 min, equilibrium pH-3.5

Sulfuric acid concentration and temperature both have a significant effect on leaching process. When the sulfuric acid concentration reached 0.53 mol L −1, FeO from Fe 3 O 4 was slightly decomposed. 25 However, an …

1. Introduction. Electrolytic manganese residue (EMR) is a mixed filter slag generated during electrolytic metal manganese (EMM) production. It mainly consists of the leaching residue from the reaction between manganese ore and sulfuric acid, as well as the precipitation residue obtained from the impurity removal of manganese sulfate …

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.

The increase in manganese leaching efficiency slowed when the sulfuric acid concentration exceeded 1.7 mol·L −1. Higher concentration should be avoided due to the fact that concentrated sulfuric acid is consumed in attacking the gangue constituents of the ore. Thus, it is preferable to apply the leaching process using 1.7 mol·L −1 ...

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.

Banana peel reductant for leaching medium grade manganese ore in sulfuric acid solution H. Aripin; H. Aripin a) 1 Department of Electrical Engineering, ... It has been found that an increase of the weighed amount of banana peels up to 4 g leads to an increase of the leaching efficiency of manganese from manganese ore. Above 4 g, …

Under optimum conditions, 93.4 wt% Mn and 15.8 wt% Fe can be leached using 0.7 M sulfuric acid and 0.5 M oxalic acid for 1 h at 63°C. Hazek et al. 79 performed a similar study as Sahoo et al. 77 ...

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 …

The amount of sulfuric acid used when the leaching rate of manganese is the highest (1.2 M) is 14% less than that for conventional heating (1.4 M) (Gharabaghi et al., 2013). Download : Download high-res image (211KB) Download : Download full-size image; Fig. 4. Effect of the initial concentration of sulfuric acid on leaching efficiency.

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

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.

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 …

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 …

Mn has been successfully leached from manganese oxide ores in sulfuric acid medium using various agricultural byproducts and plant powders, for example, tea waste, molasses, corn-stalk, corncob ...

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).

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.

Pyrolysis effectively liberates the tantalum–rich sintered core from outer resin which is followed by mild organic acid leaching. The manganese impurity was removed from the core to obtain Ta ...

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 ...

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.

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 …

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 …

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 ...

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 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.

The present study evaluates the possibility of selective leaching of manganese from complex, manganese and iron oxy-hydroxide based sea bed nodule utilising micelles in high temperature acid dissolution process. Application of surfactants during acid leaching of manganese nodules are described based on results from …

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

DOI: 10.1016/J.JECE.2018.09.044 Corpus ID: 105382206; Recovery of manganese from sulfuric acid leaching liquor of spent lithium-ion batteries and synthesis of lithium ion-sieve

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 …

Leaching Kinetics of Selenium, Tellurium and Silver from Copper Anode Slime by Sulfuric Acid Leaching in the Presence of Manganese(IV) Oxide and Graphite † Kurniawan Kurniawan 1,2, Jae-chun Lee 1,2, Jonghyun Kim 1,2, Rina Kim 1,2 and Sookyung Kim 1,2,* 1 Resources Recycling, Korea University of Science and Technology, Daejeon 34113, …

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 ...