Despite the increased demand for resource recovery from spent lithium-ion batteries (LIBs), low Mn leaching efficiencies have hindered the development of this technology. A novel process was devised to enhance the dissolution of metals by producing citric acid using a molasses medium by Penicillium …
Enhanced requirements for manganese alloys and compounds for several commercial applications created a desperate demand for manganese recovery technologies …
The kinetics studies indicate that the leaching process follows the shrinking-core model in the temperature ranging from 333 K to 363 K, the leaching rate of manganese is controlled by the ...
with manganese leaching efficiencies greater than 98%. Keywords: manganese ore treatment; pyrolusite; sawdust; pyrolysis; leaching; manganese 1. Introduction Manganese (Mn) is a key strategic resource that is widely used in numerous fields such as ferrous metallurgy, nonfer-rous metal production, battery production, and fine chemi-cals [1−2].
indicated that the reductive leaching process was controlled by the chemical reaction. The reaction orders with respect to the sulfuric acid concentration and mass ratio of sawdust are 1.66 and 0.57, respectively. The apparent activation energy for the leaching process has been calculated using the Arrhenius expression and was found to be 51.7 ...
The process is popularly known as the methanol-to-olefin (MTO) reaction, which converts C1 methanol into light olefins, particularly ethylene and propylene. The MTO reaction was …
Recently, manganese has been extracted the manganese ores and manganese-iron ores by reductive leaching using carbohydrates, [22][23][24][25] pyrite, 26 methanol, 27 SO 2, 28 oxalic acid, 29 ...
The dissolution of MnO 2 from manganese nodules is possible by a leaching process that works at low potential values, using a reducing agent (Randhawa et al., 2016) such as coal (Kanungo and Das ...
The recovery rates for nickel, cobalt, manganese and lithium in the whole process were 96.84%, 81.46%, 92.65% and 91.39% respectively, a technical route to recover nickel, cobalt, manganese and ...
This study proposes a new scheme for selectively extracting manganese from pyrolusite by the sulfation roasting-water leaching process, while the iron is enriched in the leaching residues in the form of Fe 2 O 3. With a 1.5:1 mass ratio of ammonium sulfate to pyrolusite, a roasting temperature of 650 °C, and a duration of 120 min, the ...
The reductive leaching of manganese oxide ore in aqueous methanol–sulphuric acid was investigated. Studies were conducted at low (30 and 70°C) and high (120–170°C) …
(WK ore and TG ore) were used to investigate the comparison of manganese leaching behavior with different leaching reagents. Figure 4 shows that without reducing agents, both manganese ores were very difficult to be leached by all leaching reagents. Figure 4. Manganese recoveries on the leaching of manganese ores (WK ore and TG ore) by
Some aspects of the kinetics of reductive leaching of manganese oxide ore in aqueous methanol–sulphuric acid medium have been investigated, looking at the effects of …
The dissolution of MnO 2 from manganese nodules is possible by a leaching process that works at low potential values, using a reducing agent (Randhawa et al., 2016) such as coal (Kanungo and Das ...
The process involves: ① leaching manganese nodules at 90 °C for 4 h with a 1.25 mol/L sulfuric acid concentration, a 3:2 nodule-to-pyrrhotite ratio, a 2:1 liquid-to-solid ratio, stirring at 300 rpm; ② removing impurities such as iron and aluminum through oxidation precipitation; ③ adding sodium sulfide and stirring at 50 °C for 2 h to ...
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 leaching …
The dissolution of MnO 2 from manganese nodules is possible by a leaching process that works at low potential values, using a reducing agent ... A summary of relevant studies was presented in a review paper by Sinha and Purcell ... Reductive leaching of manganese oxide ore in aqueous methanol-sulphuric acid medium. Hydrometallurgy, 51 (1) (1999
Some aspects of the kinetics of reductive leaching of manganese oxide ore in aqueous methanol–sulphuric acid medium have been investigated, looking at the effects of methanol and sulphuric acid concentrations, temperature and particle size on the rate of manganese extraction. Two distinct regions of rate control have been identified. The initial 30 …
The present review summarizes the process developed for extraction and recovery of manganese from ores using different kinds of reducing agents. The parameters affecting the …
Microwave heating also has a significant effect on the phase transformation of manganese during the leaching process. Under the conditions of microwave heating, leaching in the solution at 90 °C for 2.5 h with a total acid concentration of 1.2 mol/L, 20% of additive pyrite, and a stirring rate of 400 rpm, the leaching rate of manganese was 95. ...
The result shows that at 70°C, the content of manganese in the product decreased about 17% from 6.41 × 10 4 mg/kg to 5.32 × 10 4 mg/kg. This might be due to at high temperatures, not only H2O2 ...
The results showed that high manganese recovery with low Fe and Al extraction yield could be obtained by analyzing the leaching efficiencies of Mn, Fe and Al during the leaching process. The optimal leaching condition was determined as 1.9 mol/L H 2 SO 4 and 60.0 g/L cane molasses for 120 min at 90 °C while using particles smaller than 0.147 ...
Leaching of manganese (Mn) and ammonia nitrogen (NH 4 +-N) from electrolytic manganese residue (EMR) is the key technology to realize the resource utilization of EMR.In this paper, the leaching behavior of manganese and ammonia nitrogen in EMR by H 2 SO 4, H 2 C 2 O 4, H 3 C 6 H 5 O 7 and H 2 O 2 system was compared and analyzed. The leaching process …
Kinetic studies show that the leaching process of manganese has its own characteristics that is controlled by mixing before 10 min, and then controlled by diffusion after 10 min, with an apparent ...
In summary, the optimum leaching condition was a 5% volume fraction of ethanol, which resulted in a leaching rate of 88.74% of manganese. As can be seen in Figure 1 d, the leaching rate of manganese gradually increases with the gradual increase of the liquid to solid ratio and then stabilizes. This is because, with the increase of the liquid to ...
The innovative hydrometallurgical processing technique for industrial zinc and manganese process residues generally conventional roast-reduction is adopted for the manufacture of electrolytic manganese dioxide (EMD)/ chemical …
The fire reduction leaching process is roasting under the condition of adding solid reducing agents or passing reducing gases to reduce the high-valent manganese oxides to MnO, followed by leaching with the acid solution for manganese extraction. ... Reductive leaching of manganese oxide ore in aqueous methanol–sulphuric acid medium ...
products by using sulfuric acid as the leaching agent. The process of manganese oxide ores by sulfur–based reduction roasting–acid leaching is a new approach for efficiently utilizing ... The effects of sulfur addition on sulfidation extent were determined by the bromine–methanol leach. The phase transformation in the roasting process was ...
It was found that the use of H 2 O 2 as a reducing agent for the reductive leaching of manganese increased the leaching rate. Analysis of the experimental results indicted that the leaching process is fitted by a chemical reaction model in temperature range 20–40 °C, and at higher temperature, 45–70 °C, the diffusion reaction model prevails.
Manganese was leached from a low-grade manganese ore (LGMO) using banana peel as the reductant in a dilute sulfuric acid medium. The effects of banana peel amount, H2SO4 concentration, reaction temperature, and time on Mn leaching from the complex LGMO were studied. A leaching efficiency of ∼98% was achieved at a leaching time of 2 h, banana peel …
the leaching process; thus, the leaching was carried out in an acidic medium. Sulphur reduces manganese oxide ores to form different oxides of manganese and under the
methanol, hydrogen peroxide etc. are used in the leaching process. However, leaching with sulphuric acid seems to be the most common approach [8]. Although, a greener approach for the reduction of manganese ore using agri-cultural biomass is more effective, accessible, renewable, economical and highly reactive under mild acidic condi-tions [9 ...
The results showed that high manganese recovery with low Fe and Al extraction yield could be obtained by analyzing the leaching efficiencies of Mn, Fe and Al during the leaching process. The optimal leaching condition was determined as 1.9 mol/L H 2 SO 4 and 60.0 g/L cane molasses for 120 min at 90 °C while using particles smaller than 0.147 mm.
The reductive acid leaching... | Leaching, Methanol and Lithium Ion Batteries | ResearchGate, the professional network for scientists. ... The recovery rates for nickel, cobalt, manganese and ...
A fully hydrometallurgical process to leach manganese and silver from typical manganese–silver ores, which included the reductive treatment of primary ores with CaS in aqueous medium, in situ production of S 2 O 3 2 −, leaching of manganese in a dilute H 2 SO 4 solution, and leaching of silver in a S 2 O 3 2 −–Cu 2 +–NH 3 system, has ...