scholarly journals Sequential Bioleaching of Pyritic Tailings and Ferric Leaching of Nonferrous Slags as a Method for Metal Recovery from Mining and Metallurgical Wastes

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1097
Author(s):  
Natalya Fomchenko ◽  
Maxim Muravyov
Keyword(s):  
Nonferrous Metal ◽  
Microbial Consortium ◽  
Copper Slag ◽  
Leach Solution ◽  
Nonferrous Metals ◽  
Oxidizing Agent ◽  
Total Recovery ◽  
Metallurgical Wastes ◽  
Efficient Extraction ◽  
Ferric Leaching

In this work, we proposed a method for biohydrometallurgical processing of mining (old pyritic flotation tailings) and metallurgical (slag) wastes to recover gold and other nonferrous metals. Since this processing allows the removal of toxic metals or at least decreases their content in the solids, this approach may reduce the negative environmental impacts of such waste. The proposed process was based on pyritic tailings’ bioleaching to recover metals and produce leach liquor containing a strong oxidizing agent (ferric sulfate) to dissolve nonferrous metal from slag. This approach also allows us to increase concentrations of nonferrous metals in the pregnant leach solution after pyritic waste bioleaching to allow efficient extraction. The old pyritic tailings were previously leached with 0.25% sulfuric acid for 10 min to remove soluble metal sulfates. As a result, 36% of copper and 35% of zinc were extracted. After 12 days of bioleaching with a microbial consortium containing Leptospirillum spp., Sulfobacillus spp., Ferroplasma spp., and Acidithiobacillus spp. at 35 °C, the total recovery of metals from pyritic tailings reached 68% for copper and 77% for zinc; and subsequent cyanidation allowed 92% recovery of gold. Ferric leaching of two types of slag at 70 °C with the leachate obtained during bioleaching of the tailings and containing 15 g/L of Fe3+ allowed 88.9 and 43.4% recovery of copper and zinc, respectively, from copper slag within 150 min. Meanwhile, 91.5% of copper, 84.1% of nickel, and 70.2% of cobalt were extracted from copper–nickel slag within 120 min under the same conditions.

Ferric leaching of copper slag flotation tailings

2009 ◽  
Vol 22 (1) ◽  
pp. 107-110 ◽  
Author(s):  
F. Carranza ◽  
N. Iglesias ◽  
A. Mazuelos ◽  
R. Romero ◽  
O. Forcat
Keyword(s):  
Copper Slag ◽  
Flotation Tailings ◽  
Ferric Leaching

Development of Nonferrous Metal Deposits in Geological Time

1973 ◽  
Vol 10 (1) ◽  
pp. 18-25 ◽  
Author(s):  
P. Laznicka
Keyword(s):  
Nonferrous Metal ◽  
Ore Deposits ◽  
Nonferrous Metals ◽  
Earth’S Crust ◽  
Evolutionary Trends ◽  
Geological Time ◽  
Earth's Crust

A computer-derived graph of a development of deposits of twelve nonferrous metals in geological time is presented. It is based on a file containing over 5000 ore deposits, districts, and metalliferous areas of the world.The sequence of depositional ages based on ore deposits presently outcropping on the earth's surface is, from the oldest to the youngest, Cr, Ni–Au–Cu, Zn–Pb, Ag–Sn, W, Sb, Mo–Hg. Although this sequence parallels several evolutionary trends involved in the formation of the earth's crust, it is believed and semiquantitatively demonstrated that depth of denudation rather than evolution is the more important factor; in other words, the conditions of preservation have had greater influence on the age relationships of ore deposits outcropping on the present earth's surface than have the conditions of formation and their progressive evolution in the earth's history.

scholarly journals Dissolution of lead matte and copper slag upon exposure to rhizosphere-like conditions

2017 ◽  
Vol 4 (1) ◽  
pp. 21-32 ◽  
Author(s):  
Anna Potysz ◽  
Jakub Kierczak
Keyword(s):  
Root Exudates ◽  
Copper Slag ◽  
Metal Release ◽  
Water Control ◽  
Demineralized Water ◽  
Metallurgical Wastes ◽  
Granulated Slag ◽  
The Stability ◽  
Organic Solutions ◽  
A Minor

Abstract Metallurgical wastes displaying various chemical and mineralogical properties may reveal different behaviour under exposure to weathering conditions. The latter impact the stability of the wastes, which often results in metal release and subsequent pollution problems. The aim of this study was to compare the weathering of two types of metallurgical wastes (i.e., copper slag and lead matte) exposed to artificial root exudates organic solutions and demineralized water. The results of experimental weathering demonstrated that the extent of waste dissolution depends on the composition of weathering solution as well as on the waste properties. Artificial root exudates rich in organic acids were found to enhance elements release from sulphide rich lead matte and copper glassy slag relative to demineralized water control. The release of elements from the wastes exposed to artificial root exudates for 7 weeks reached 17.8% of Pb and 4.97% of Cu, for lead matte and granulated slag respectively. The most leachable elements may result from the dissolution of intermetallic phases hosting these elements. The fraction size ranging from 0.25–0.5 mm to 1–2 mm was found to be a minor factor in elements release under studied conditions.

Mineralogical Characterization of Copper Slag from Tongling Nonferrous Metals Group China

JOM ◽  
2015 ◽  
Vol 68 (9) ◽  
pp. 2332-2340 ◽  
Author(s):  
Tiejun Chun ◽  
Chao Ning ◽  
Hongming Long ◽  
Jiaxin Li ◽  
Jialong Yang
Keyword(s):  
Copper Slag ◽  
Nonferrous Metals ◽  
Mineralogical Characterization

Triple Fixation For Electron Microscopy

1968 ◽  
Vol 26 ◽  
pp. 90-91 ◽  
Author(s):  
M. A. Hayat
Keyword(s):  
Electron Microscopy ◽  
Endoplasmic Reticulum ◽  
Electron Beam ◽  
Plasma Membrane ◽  
Myelin Sheath ◽  
Good Deal ◽  
Granular Structure ◽  
Oxidizing Agent ◽  
Fixation Technique ◽  
Large Clusters

Potassium permanganate has been successfully employed to study membranous structures such as endoplasmic reticulum, Golgi, plastids, plasma membrane and myelin sheath. Since KMnO4 is a strong oxidizing agent, deposition of manganese or its oxides account for some of the observed contrast in the lipoprotein membranes, but a good deal of it is due to the removal of background proteins either by dehydration agents or by volatalization under the electron beam. Tissues fixed with KMnO4 exhibit somewhat granular structure because of the deposition of large clusters of stain molecules. The gross arrangement of membranes can also be modified. Since the aim of a good fixation technique is to preserve satisfactorily the cell as a whole and not the best preservation of only a small part of it, a combination of a mixture of glutaraldehyde and acrolein to obtain general preservation and KMnO4 to enhance contrast was employed to fix plant embryos, green algae and fungi.

Radiolabeling of Fibrinogen Using the Iodogen Technique

1981 ◽  
Vol 46 (03) ◽  
pp. 593-596 ◽  
Author(s):  
Linda C Knight ◽  
Andrei Z Budzynski ◽  
Stephanie A Olexa
Keyword(s):  
Specific Radioactivity ◽  
Oxidizing Agent ◽  
Iodine Monochloride ◽  
Human Fibrinogen

SummaryThe properties of human fibrinogen labeled with 125-Iodine using Iodogen (1, 3, 4, 6-tetrachloro-3α, 6α-diphenylglycoluril) as an oxidizing agent were compared with those of an iodine monochloride labeled counterpart. It was found that thrombin clottability, binding to staphylococci, the relative specific radioactivity of the Aα, Bβ, and γ chains and in vivo clearance from plasma in rabbits were the same in these two labeled fibrinogen preparations. Labeling efficiency was higher when iodogen was used. It is concluded that human fibrinogen labeled with radioiodine using the Iodogen technique is suitable for studies in vitro and in vivo.

Effect of Copper Slag as a Fine Aggregate on the Durability Characteristics of High-Performance Concrete (HPC) Containing Silica Fume

2020 ◽  
Vol 07 (02) ◽  
pp. 1-10
Author(s):  
Rizwan Ahmad Khan ◽  
Keyword(s):  
Silica Fume ◽  
High Performance ◽  
High Performance Concrete ◽  
Copper Slag ◽  
Chloride Penetration ◽  
Interfacial Transition Zone ◽  
Fine Aggregate ◽  
Fresh Properties ◽  
Fine Aggregates ◽  
Effect Of Copper

This paper investigates the fresh and durability properties of the high-performance concrete by replacing cement with 15% Silica fume and simultaneously replacing fine aggregates with 25%, 50%, 75% and 100% copper slag at w/b ratio of 0.23. Five mixes were analysed and compared with the standard concrete mix. Fresh properties show an increase in the slump with the increase in the quantity of copper slag to the mix. Sorptivity, chloride penetration, UPV and carbonation results were very encouraging at 50% copper slag replacement levels. Microstructure analysis of these mixes shows the emergence of C-S-H gel for nearly all mixes indicating densification of the interfacial transition zone of the concrete.

Appraisal of capabilities of nonferrous metal recovery from old copper-nickel ore processing tailings

2019 ◽  
Vol 7 ◽  
pp. 196-206
Author(s):  
E.V. Chernousenko ◽  
◽  
I.N. Vishnyakova ◽  
Yu.S. Kameneva ◽  
Yu.N. Neradovskiy ◽  
...  
Keyword(s):  
Nonferrous Metal ◽  
Metal Recovery ◽  
Copper Nickel ◽  
Ore Processing

Spectrophotometeric Determination of Trifluoperazine HCL in Pure Forms and Pharmaceutical Preperations

2017 ◽  
Vol 9 (5) ◽  
Author(s):  
Mohammad Hamzah Hamzah ◽  
Rawa M M Taqi ◽  
Muna M. Hasan ◽  
Raid J. M. Al-Timimi
Keyword(s):  
Standard Method ◽  
Limit Of Detection ◽  
Molar Absorptivity ◽  
Dosage Forms ◽  
Oxidizing Agent ◽  
Optimum Conditions ◽  
Limit Of Quantification ◽  
Cerium Ion ◽  
Blank Solution

A simple and accurate spectrophotometric method for the determination of Trifluoperazine HCl in pure and dosage forms was developed. The method is based on the reaction between Trifluoperazine HCl and p-chloroaniline in the presence of cerium ion as oxidizing agent which lead to the formation of violate color product that absorbed at a maximum wavelength 570nm while the blank solution was pink. Under the optimum conditions a linear relationship between the intensity and concentration of TRF in the range 4-50μg/ml was obtained . The molar absorptivity 3.74×103 L.mol-1.cm-1 , Limit of detection (2.21μg/ml), while limit of quantification was 7.39μg/ml. The proposed analytical method was compared with standard method using t-test and F-test , the obtained results shows there is no significant differences between proposed method and standard method. Based on that the proposed method can be used as an alternative method for the determination of TRF in pure and dosage forms.

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