scholarly journals A novel method to remove Ca2+ and Mg2+ impurities from manganese sulfate solution

2016 ◽  
Author(s):  
Zefang Chenli ◽  
Fang Lian ◽  
Laijun Ma
Keyword(s):  
Sulfate Solution ◽  
Manganese Sulfate ◽  
Novel Method

scholarly journals Selective Recovery of Manganese from Anode Sludge Residue by Reductive Leaching

2020 ◽  
Vol 4 (2) ◽  
pp. 40
Author(s):  
Toni Kauppinen ◽  
Tuomas Vielma ◽  
Justin Salminen ◽  
Ulla Lassi
Keyword(s):  
Hydrogen Peroxide ◽  
Sulfuric Acid ◽  
High Selectivity ◽  
Sulfate Solution ◽  
Correct Choice ◽  
Manganese Sulfate ◽  
Solid Residue ◽  
Reductive Leaching ◽  
Novel Method ◽  
Leaching Residue

Manganese-containing anode sludge is a common side-product in the electrowinning of zinc. The anode sludge consists mainly of oxidized manganese, but also lesser amounts of lead, calcium, and other minor metals. The impurities present in the anode sludge mandate new recycling strategies for its efficient use. This work demonstrates a novel method for selective manganese recovery from lead- and calcium-bearing manganese oxide solid residue. Leaching with sulfuric acid in the presence of a selected reducing agent, such as hydrogen peroxide or citric acid, yields a concentrated MnSO4 solution with high selectivity over calcium and lead. Manganese yields up to 98% can be obtained. Minimization of calcium and lead in final manganese product can be accomplished with the correct choice of leaching conditions. Alongside manganese sulfate solution, leaching residue with high content of lead and silver was also formed.

Separation of Heavy Metal Ions from the Solution Obtained by Leaching Low-Grade Pyrolusite with Pyrite and H2SO4

2013 ◽  
Vol 773 ◽  
pp. 283-288
Author(s):  
Xing Zou ◽  
Xiang Quan Chen ◽  
Hai Chao Xie ◽  
Xiao Dan Qiu
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Separation Efficiency ◽  
Ph Value ◽  
Sulfate Solution ◽  
Ion Concentration ◽  
Manganese Sulfate ◽  
Low Grade ◽  
High Concentration

The manganese sulfate solution leached from low-grade pyrolusite with pyrite and H2SO4 contains heavy metal ions of high concentration, influencing the quality of the final products of manganese compounds and causing manganese ions not to be electrolyzed. The present study was focused on the separation of Co, Ni and Zn ions from the leached solution with BaS. By controlling the pH value at 5.0-6.5, temperature at 50-60°C, reaction time at 15 min and mixing velocity at 78 rpm, the heavy metal ions could be separated effectively. Under the above optimized conditions, the ion concentration of Co, Ni, and Zn in the solution was reduced to 0.06 mg.L-1, 0.27mg.L-1 and 0.01mg.L-1, and the separation efficiency was 99.72%, 99.18% and 99.9% respectively. The obtained pure solution meets the demands of manganese electrowinning.

Efficient removal of iron(II) from manganese sulfate solution by using mechanically activated CaCO3

2019 ◽  
Vol 188 ◽  
pp. 169-173 ◽  
Author(s):  
Kui Wang ◽  
Qiwu Zhang ◽  
Huimin Hu ◽  
Yanchu Liu
Keyword(s):  
Sulfate Solution ◽  
Manganese Sulfate ◽  
Efficient Removal

Separation of Nickel in Manganese Sulfate Solution Soaked out from Low-Grade Pyrolusite with Pyrite and H2SO4

2013 ◽  
Vol 779-780 ◽  
pp. 255-258
Author(s):  
Xing Zou ◽  
Xiao Dan Qiu
Keyword(s):  
Binary Systems ◽  
Sulfate Solution ◽  
Manganese Sulfate ◽  
Low Grade ◽  
Nickel Ion ◽  
Original Solution ◽  
Nickel Ions ◽  
Equilibrium Time ◽  
Ion Concentrations ◽  
Analytical Reagents

The study on separation of nickel ions with S.D.D from six kinds of solutions or systems was conducted. One of six kinds of systems was prepared with the solution (called as original solution here) leached from pyrolusite with pyrite and H2SO4, and the other five kinds of systems were prepared with analytical reagents, they are respectively: a monophyletic system of NiSO4, two binary systems of MnSO4NiSO4 and (NH4)2SO4NiSO4, a ternary system of MnSO4(NH4)2SO4NiSO4, a pentanary system of MnSO4(NH4)2SO4NiSO4CoSO4ZnSO4. The experiments about reaction time and S.D.D dosage were conducted. Results showed that the equilibrium time of reactions for the prepared five systems were equally 10min at most, while 3h was needed at least for original solution under the conditions of low temperature and low stirring speed. The residual nickel ion concentrations of the six systems were different when the same multiples of S.D.D theory dosage of each system was used for separation of nickel ions, and the S.D.D dosages for the six systems needed to meet the requirement of electrolysis were also different.

Preparation of New Nano-MnO2 and Its Molybdenum Adsorption in Manganese Sulfate Solution

2020 ◽  
Vol 12 (9) ◽  
pp. 1070-1078
Author(s):  
Wang Haifeng ◽  
Chen Xiaoliang ◽  
Zhao Pingyuan ◽  
Gao Zhaowei ◽  
You Xiaoyu ◽  
...  
Keyword(s):  
Manganese Dioxide ◽  
Adsorption Process ◽  
Removal Rate ◽  
Sulfate Solution ◽  
Crystal Form ◽  
Quality Standard ◽  
Hydroxyl Groups ◽  
Manganese Sulfate ◽  
Order Kinetic ◽  
Surface Hydroxyl

Manganese sulfate solution was in this study oxidized, using H2O2 as oxidant, to obtain new Nano-MnO2 in situ. The characterization of new MnO2 was carried out by XRD, SEM, FT-IR and BET. The effect of new manganese dioxide adsorpting molybdenum ion in manganese sulfate solution was also studied. Results showed that the main crystal form of the new MnO2 was γ type, and there was agglomeration of nanospheres with 200∼300 nm diameter from the microscopic morphology, which had abundant surface hydroxyl groups, and its specific surface area was as high as 146 m2/g. MnO2 addition was 1.0 g under optimal adsorption conditions when the pH was 2, and the reaction time was 30 min, with removal rate of 99.2% molybdenum and 0.26 ppm residual amount of molybdenum in manganese sulfate solution, which met the quality standard for high purity manganese sulfate (HG/T4823-2015) with ≤5 ppm molybdenum content. Moreover, the thermodynamics and kinetics of molybdenum adsorption by new manganese dioxide were also studied. The experiments showed that the adsorption process was in accordance with the Freundlich adsorption equation. The adsorption process of molybdenum on manganese dioxide could be described with pseudo second order kinetic model, and the internal diffusion was a controlling link of adsorption rate.

The removal and morphology of intact biofilms from implanted venous access devices

1995 ◽  
Vol 53 ◽  
pp. 1020-1021
Author(s):  
M.A. Gregory ◽  
G.P. Hadley
Keyword(s):  
Patient Selection ◽  
Surgical Oncology ◽  
Venous Access ◽  
Common Procedure ◽  
Indwelling Catheters ◽  
Careful Patient ◽  
Novel Method ◽  
The Subject ◽  
Vascular Catheters ◽  
Venous Access Devices

The insertion of implanted venous access systems for children undergoing prolonged courses of chemotherapy has become a common procedure in pediatric surgical oncology. While not permanently implanted, the devices are expected to remain functional until cure of the primary disease is assured. Despite careful patient selection and standardised insertion and access techniques, some devices fail. The most commonly encountered problems are colonisation of the device with bacteria and catheter occlusion. Both of these difficulties relate to the development of a biofilm within the port and catheter. The morphology and evolution of biofilms in indwelling vascular catheters is the subject of ongoing investigation. To date, however, such investigations have been confined to the examination of fragments of biofilm scraped or sonicated from sections of catheter. This report describes a novel method for the extraction of intact biofilms from indwelling catheters.15 children with Wilm’s tumour and who had received venous implants were studied. Catheters were removed because of infection (n=6) or electively at the end of chemotherapy.

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