Separation of copper and indium from zinc hydrometallurgy solution

2020 ◽  
Vol 18 (12) ◽  
Author(s):  
Zhigan Deng ◽  
Yu Zheng ◽  
Xingbin Li ◽  
Chang Wei ◽  
Minting Li ◽  
...  
Keyword(s):  
Production Process ◽  
Iron Powder ◽  
Decisive Role ◽  
Indium Content ◽  
Reductive Leaching ◽  
Powder Addition ◽  
Leaching Residue ◽  
Hydrolytic Precipitation ◽  
Favorable Conditions ◽  
Zinc Hydrometallurgy

AbstractThe separation and recovery of copper and indium from a solution arising from the reductive leaching of a zinc leaching residue was studied. Copper was enriched into a copper precipitate produced by iron powder precipitation; indium was hydrolyzed and enriched into a gypsum indium precipitate produced by limestone adjustment of pH. Separation and recovery of both copper and indium were achieved. The results showed that precipitation of copper(II) and arsenic(III) as Cu2O and Cu3As is thermodynamically feasible by adding iron powder to the reductive leach of a zinc leaching residue. Increasing the iron powder addition and reaction temperature promoted the formation of Cu2O and Cu3As. In the process of neutralizing and precipitating indium by adjusting the pH using limestone, indium was mainly concentrated in the precipitate by hydrolytic precipitation. The pH of the neutralization endpoint plays a decisive role in this hydrolytic enrichment. The extent of indium precipitation exceeded 98%, and the indium content of the precipitate reached 3.6 kg/t. Addition of limestone balances the acid across the entire production process. The main phase in the gypsum indium precipitate was CaSO4·2H2O, the stable properties of which create favorable conditions for the recovery of indium in subsequent steps.

Effect of Pressure Carbonization in Carbon/Carbon Composite Process (II)

1991 ◽  
Vol 251 ◽  
Author(s):  
H. Okamoto ◽  
T. Hosomura ◽  
K. Kosaka
Keyword(s):  
Iron Powder ◽  
Phenolic Resin ◽  
Carbon Composite ◽  
X Ray Diffraction ◽  
Micro Structure ◽  
Carbon Yield ◽  
X Ray ◽  
Effect Of Pressure ◽  
Heat Treated ◽  
Powder Addition

ABSTRACTWe have found that pressurized carbonization cause the increase of carbon yield and the improvement of micro structure In the case of pitch resin. While the effects of pressurized carbonization on phenolic resin are not obvious.In this study, carbonization and graphitization characteristics of phenolic resin were investigated experimentally. Phenolic resin specimens with and without iron powder addition were carbonized at the temperature of 650 °C under the pressure of atmospheric or 100MPa. Then each of them was heat-treated at the temperature of 1200, 1500 and 1900 °C respectively. Measurement of yield, density, x-ray diffraction and optical observation were carried out in the experiments. It is indicated from those results that pressurized carbonization of phenolic resin makes graphite crystallization progress and this effect is promoted by addition of iron powder.

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.

scholarly journals Fusarium Mycotoxins Stability during the Malting and Brewing Processes

Toxins ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 257 ◽  
Author(s):  
Karim C. Piacentini ◽  
Sylvie Běláková ◽  
Karolína Benešová ◽  
Marek Pernica ◽  
Geovana D. Savi ◽  
...  
Keyword(s):  
Dietary Intake ◽  
Production Process ◽  
Decisive Role ◽  
Raw Material ◽  
Research Groups ◽  
Fusarium Mycotoxins ◽  
Spent Grains ◽  
The Creation ◽  
The Stability

Mycotoxins are widely studied by many research groups in all aspects, but the stability of these compounds needs further research for clarification. The objective of this study is to evaluate deoxynivalenol and zearalenone stability during all steps of the malting and brewing processes. The levels of these compounds decreased significantly during the production process (barley to beer). During the malting process, the DON levels decreased significantly in the steeping, germination, and malting steps (62%, 51.5%, and 68%, respectively). Considering ZEN, when the levels were compared between barley and the last step of the process, a significant decrease was observed. Most of the mycotoxins produced were transferred to the rootlets and spent grains, which is advantageous considering the final product. Furthermore, the mycotoxin dietary intake estimation was included in this study. The results proved that if the concentrations of target mycotoxins in raw material are under the limits established by the regulations, the levels decrease during the malting and brewing processes and make the beer secure for consumers. The quality of the five commodities involved in the beer process plays a decisive role in the creation of a safe final product.

Influence of Iron Powder Addition on the Structure Characteristics of Hypereutectic Grey Cast Iron

2010 ◽  
Vol 457 ◽  
pp. 96-101
Author(s):  
Mihai Chisamera ◽  
Iulian Riposan ◽  
Stelian Stan ◽  
Cristina Militaru ◽  
Michael Barstow
Keyword(s):  
Iron Powder ◽  
Negative Influence ◽  
Eutectic Cell ◽  
Efficient Treatment ◽  
Beneficial Effects ◽  
Complex Morphology ◽  
Graphite Morphology ◽  
Grey Cast ◽  
Powder Addition ◽  
High Cooling Rates

Slightly hypereutectic grey irons (< 4.5%CE), solidified in resin and metal moulds, after an addition of iron powder, either alone or with Ca,Ba,Al-FeSi inoculation (double treatment) were characterized by structure. Iron powder had a role in limiting the carbide presence, while the supplementary inoculation led to the fewest carbides in metal mould samples. No carbides were in resin mould solidification, while graphite morphology progressed from (C + B) in the base iron up to the type (B + A) in double treated iron. Polygonal (Mn,X)S compounds acting as graphite nuclei, whose characteristics depended on the applied treatment, were found: larger size/low compactness [base iron], irregular polygonal with tendency to the highest size and complex morphology [iron powder treatment] and compact polygonal/smallest size [double treatment]. Iron powder has a negative influence on the graphite nuclei and eutectic cell characteristics, but favours austenite dendrite formation, as a reinforcement for eutectic cells. It has a limited graphitizing effect, witnessed only at high cooling rates. A double addition [iron powder + inoculant] appears to be an efficient treatment, with beneficial effects on both the austenite and graphite nucleation, affecting the final structure and chill tendency.

Mechanical Activation-Assisted Reductive Leaching of Cadmium from Zinc Neutral Leaching Residue Using Sulfur Dioxide

JOM ◽  
2015 ◽  
Vol 67 (12) ◽  
pp. 3010-3021 ◽  
Author(s):  
Chun Zhang ◽  
Xiaobo Min ◽  
Liyuan Chai ◽  
Jianqiang Zhang ◽  
Mi Wang
Keyword(s):  
Sulfur Dioxide ◽  
Mechanical Activation ◽  
Reductive Leaching ◽  
Leaching Residue

Influence of Iron Powder Addition on the Number of Primary Austenite Grains and Tensile Strength of Inoculated Cast Iron

2014 ◽  
Vol 790-791 ◽  
pp. 59-64 ◽  
Author(s):  
Dariusz Kopyciński ◽  
Edward Guzik ◽  
Andrzej Szczęsny ◽  
Józef Dorula
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Iron Powder ◽  
Face Centered Cubic ◽  
Iron Particles ◽  
Primary Austenite ◽  
Powder Addition ◽  
Austenite Grains ◽  
Face Centered ◽  
Inoculation Treatment

The study proves that by introducing the iron powder to low-sulphur cast iron still before the inoculation carried out with a conventional graphitising inoculant, the mechanical properties similar to those obtained during the inoculation treatment carried out on cast iron with the recommended high sulphur content are achieved. The said operation increases the number of crystallisation nuclei for of the primary austenite dendrites. In this case, the iron particles act as substrates for the nucleation of primary austenite due to a similar crystallographic behaviour of the regular face centered cubic lattice The more numerous are the dendrites of primary austenite, the less free space is available in the interdendritic spaces for the formation of graphite eutectic grains, which makes the mechanical properties higher.

Effects of Iron Powder Addition on the Solidification Behaviour of Hypereutectic Grey Cast Iron

2010 ◽  
Vol 457 ◽  
pp. 90-95 ◽  
Author(s):  
Mihai Chisamera ◽  
Iulian Riposan ◽  
Stelian Stan ◽  
Irina Anton ◽  
Michael Barstow
Keyword(s):  
Thermal Analysis ◽  
Cast Iron ◽  
Iron Powder ◽  
Nucleation Sites ◽  
Solidification Pattern ◽  
Grey Cast ◽  
Powder Addition ◽  
High Cooling Rates ◽  
Eutectic Undercooling ◽  
Commercial Iron

The purpose of the present paper is to investigate the solidification pattern of slightly hypereutectic grey irons (CE = 4.35 - 4.45%) after an addition of a commercial iron powder, and also in a double treatment with inoculation. Chill wedges with a 0.11 - 0.43 cm cooling modulus (CM), from using resin sand and metal moulds, were used along with different thermal analysis cups (CM = 0.75 and 0.43 cm). Relative clear/mottled/total chill measurement criteria were applied. Unfavourable Mn and S contents [(%Mn) x (%S) = 0.016] and a reduced Al residual (0.0015%) led to relatively high eutectic undercooling and chill in the base iron, especially at high cooling rates (CR). With the lower CM of cups, there was more undercooling in the entire solidification range and more difference between irons. Thermal analysis and chill parameter relationships are normal, except only for iron powder treatment and resin mould solidification, where chill is higher for a relatively lower undercooling. Conventional inoculation after addition of iron powder (double treatment) showed a strong graphitizing effect, as these irons had the lowest undercooling and chill levels, in all the irons tested. It reflects the improved properties of (Mn,X)S compounds as nucleation sites for graphite [10]. This paper is the first of two papers reporting on this study.

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