Characterization of Sulfidation Roasting of an Iron-Rich Manganese Oxide Ore With Elemental Sulfur

2016 ◽  
pp. 385-394
Author(s):  
Tao Jiang ◽  
Li Qin ◽  
Zhixiong You ◽  
Yuanbo Zhang ◽  
Guanghui Li
Keyword(s):  
Manganese Oxide ◽  
Elemental Sulfur ◽  
Manganese Oxide Ore

Experimental and reduction leaching kinetics simulation of iron-rich manganese oxide ore using tobacco stem concrete as reducing agent

2019 ◽  
Vol 116 (4) ◽  
pp. 422
Author(s):  
Fangfang Wu ◽  
Zhu Xiao ◽  
Bin Zeng ◽  
Long Chen ◽  
Hui Liu ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Kinetic Equations ◽  
Reducing Agent ◽  
Tobacco Stem ◽  
Electrolytic Manganese ◽  
Fe And Mn ◽  
Kinetics Simulation ◽  
Leaching Parameters ◽  
Manganese Oxide Ore

Reduction leaching behaviors of Fe and Mn from an iron-rich manganese oxide ore using waste tobacco stem concrete as reducing agent were investigated in this paper with a view to determining the feasibility of tobacco stem concrete used in reduction leaching of Mn from iron-rich manganese oxide ore. Results indicated that the leaching processes of Fe and Mn were both dominated by internal diffusion, but the effects of leaching parameters on leaching ratios of Fe and Mn were different based on established leaching kinetic equations. The leaching ratio of Mn reached up to 96.18% while that of Fe kept a lower concentration (17.66%) under optimal leaching conditions, which achieved high selectivity recovery of Mn from iron-rich manganese oxide ore. In addition, the leached solution can be used as electrolytic stock solution in the production of electrolytic manganese. Characterization of the obtained electrolytic manganese product indicated that the quality of electrolytic manganese fully met the standards of YB/T 051-2003, which disclosing a novel recycling approach of utilizing the resource coming from the tobacco industry.

The mechanism on reducing manganese oxide ore with elemental sulfur

2018 ◽  
Vol 330 ◽  
pp. 310-316 ◽  
Author(s):  
Zhixiong You ◽  
Guanghui Li ◽  
Jie Dang ◽  
Wenzhou Yu ◽  
Xuewei Lv
Keyword(s):  
Manganese Oxide ◽  
Elemental Sulfur ◽  
Manganese Oxide Ore

scholarly journals Reductive roasting of iron-rich manganese oxide ore with elemental sulfur for selective manganese extraction

2017 ◽  
Vol 53 (2) ◽  
pp. 115-122 ◽  
Author(s):  
Z. You ◽  
G. Li ◽  
Z. Peng ◽  
L. Qin ◽  
Y. Zhang ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Manganese Oxide ◽  
Manganese Dioxide ◽  
Elemental Sulfur ◽  
Acid Leaching ◽  
Molar Ratio ◽  
Sulfur Addition ◽  
Roasting Temperature ◽  
Manganese Oxide Ore ◽  
Reductive Roasting

It is very important to selectively reduce manganese oxide over iron oxide for extraction of Mn from iron-rich manganese ore. In this study, reductive roasting of an iron-rich manganese oxide ore with elemental sulfur as reductant was investigated. The experimental results demonstrated that manganese dioxide can be selectively reduced with elemental sulfur and extracted via acid leaching, which was largely depended on the sulfur addition. Lower sulfur addition (S/Mn molar ratio<1.0) results in higher selectivity, which is independent of roasting temperature. More than 95% manganese and less than 10% iron were extracted through acid leaching under the roasting conditions of 400-600?C with S/Mn molar ratio of 0.6. The contents of manganese sulfide and sulfate in the roasted product increased with increasing sulfur addition, while they decreased distinctly at temperatures above 550?C. The thermodynamic analysis also proved that manganese dioxide is more easily reduced than iron oxide by sulfur at 300-900 K. The phase transformations during reductive roasting revealed that sulfides (MnS and FeS2) were favored at temperatures lower than 550?C whereas the oxides (MnFe2O4 and Fe3O4) were predominant at higher temperatures. The reduction of iron oxide mainly occurred at large sulfur additions (S/Mn>2.0) and the roasting temperature exerted a significant impact on the phase composition of roasted product.

Characterization of Silver Binding in Cryptomelane by X-ray Absorption Spectroscopy

1998 ◽  
Vol 524 ◽  
Author(s):  
R. Ravikumar ◽  
D. W. Fuerstenau ◽  
G. A. Waychunas
Keyword(s):  
Manganese Oxide ◽  
Silver Ions ◽  
Oxide Phase ◽  
Synthetic Sample ◽  
Temperature Spectrum ◽  
X Ray ◽  
Room Temperature Sample ◽  
X Ray Absorption ◽  
Temperature Sample

ABSTRACTUsing silver K-edge extended X-ray absorption fine structure (EXAFS) spectroscopy, two different samples of silver-containing manganese oxide were analyzed in the fluorescence mode. For the first sample, silver ions from solution were sorbed onto one synthetic manganese oxide phase, namely cryptomelane (KxMn8O16, where l<x<2). The second sample was a silvermanganese oxide from Colorado. From the EXAFS analysis, silver was found to occupy two different sites in the synthetic sample. The natural samples from Colorado also exhibited a very similar coordination distances as the synthetic samples. In the low temperature spectrum of the synthetic sample at 10 K, the Ag-O peak was found to be missing and the amplitude of the Ag- Ag peak was approximately three times larger than the corresponding room temperature sample.

The Experimental of Low Temperature Color Slip for Decorative on Earthenware Body

2016 ◽  
Vol 690 ◽  
pp. 282-285
Author(s):  
Soravich Mulinta
Keyword(s):  
Low Temperature ◽  
Physical Properties ◽  
Manganese Oxide ◽  
Ferric Oxide ◽  
Potassium Feldspar ◽  
Raw Material ◽  
Blue Color ◽  
X Ray ◽  
Yellow Color

The purpose of the study was to investigate the effects of dolomite body, frit and potassium feldspar on the properties of color slip for decorative method of color slip on earthen ware production. The characterization of raw material was analyzed by X-ray fluorescence (XRF). The experiment started with triaxial blend of dolomite body, frit and potassium feldspar in the defined ratio and then to painting of color slips on earthenware production. After that, firing specimens at 950 °C in oxidation atmosphere. Finally, the specimens were tested microstructure and physical properties. The results showed that the ratio of 50% dolomite body, 40% frit and 10% potassium feldspar were optimum properties for decorative on earthenware body. In color slip consisting of blue color added Cobalt oxide 1% ,Green colors added chromic oxide 10% , Gray color added manganese oxide 10% ,yellow color added stain 2225 10% and hazel color added ferric oxide 2 wt %.

Synthesis and Redox Reactions of Binuclear Zinc(II)-thiolate Complexes with Elemental Sulfur

2021 ◽  
Author(s):  
Tilak Naskar ◽  
Nabhendu Pal ◽  
Amit Majumdar
Keyword(s):  
Redox Reactions ◽  
Elemental Sulfur ◽  
Synthesis And Characterization ◽  
Thiolate Complexes

Synthesis and characterization of a series of new binuclear Zn(II) complexes bearing (i) terminal H2O/OH, (ii) bridging thiolates, (iii) bridging thiocarboxylates, (iv) bridging carboxylates, and (v) bridging carboxylate bearing free...

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