scholarly journals Comparison of the Hydrodynamic Performance of Pulsed Solvent Extraction Columns with Tenova Pulsed Column Kinetics Internals and Standard Disc and Doughnut Internals for Copper Extraction Using the LIX 84 System

2017 ◽  
Vol 35 (5) ◽  
pp. 303-320 ◽  
Author(s):  
Wen Li ◽  
Yong Wang ◽  
Kathryn A. Mumford ◽  
Kathryn H. Smith ◽  
Geoffrey W. Stevens
Keyword(s):  
Solvent Extraction ◽  
Hydrodynamic Performance ◽  
Copper Extraction ◽  
Standard Disc

Effects of Copper Extraction-Stripping Loops on Entrainment in Aqueous Raffinate

2014 ◽  
Vol 908 ◽  
pp. 18-21
Author(s):  
Yan Jun Liu ◽  
Xiao Rong Liu ◽  
Hui Li ◽  
Yong Sheng Li ◽  
Qing Li ◽  
...  
Keyword(s):  
Surface Tension ◽  
Solvent Extraction ◽  
Early Stage ◽  
Organic Chemical ◽  
Copper Extraction ◽  
Organic Chemicals ◽  
Stabilization Mechanism ◽  
Absolute Value ◽  
Copper Solvent Extraction ◽  
Average Size

Effects of extraction-stripping loops of organic phase on organic chemical entrainment in the aqueous raffinate in copper solvent extraction were studied in this paper. Results demonstrated that the total amount of organic chemicals lost in the aqueous raffinate decreased with the increase of times of extraction-stripping loops but reached largest at third loop. Entrainment was the dominate way of organic chemicals losing in the aqueous raffinate at early stage of the loops. The formation of entrainment and its stabilization mechanism was also studied. The average size of entrained droplet trended to increase with extraction-stripping loops increasing. Meanwhile, the absolute value of zeta potential trended to decrease. The surface tension of the aqueous raffinate increased after reaching the minimum value 41.3 mN/m at the 3rd loop. It showed that the formation of entrained droplets and its stability were mainly affected by the surface tension of aqueous raffinate.

Diversity of Bioleaching Microorganisms in Interfacial Emulsion of Copper Solvent Extraction

2015 ◽  
Vol 1130 ◽  
pp. 55-58
Author(s):  
Xiao Rong Liu ◽  
Chang Su ◽  
Dao Jie Chi ◽  
Xue Song Zheng ◽  
Hua Long Yu ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
16S Rrna ◽  
Acidithiobacillus Ferrooxidans ◽  
Gene Sequencing ◽  
16S Rrna Gene Sequencing ◽  
Extraction Process ◽  
Copper Extraction ◽  
Rrna Gene ◽  
Copper Solvent Extraction ◽  
Rrna Gene Sequencing

In the bioleaching - solvent extraction - electrowinning practices for copper extraction, the solvent extraction process is used to enrich the copper in the leachate to a high lever to make the sequent electrowinning process possible. O/W type of interfacial emulsion always forms at the interface between organic phase and aqueous phase in the solvent extraction practices. Diversified microorganisms were discovered by microscope growing in the interface emulsion of copper solvent extraction. The diversity of them was analyzed by using 16s rRNA gene sequencing. It was indicated that there exist seven categories of bacteria in the interface emulsion, among which common bioleaching bacteria, such as Leptospirillum sp.,Acidithiobacillus ferrooxidans, Metallibacterium sp., are included. The dominant strains are Leptospirillum sp. E4-L9 and Acidithiobacillus ferrooxidans ATCC 23270, which account up to 40.48 % and 38.1 %, respectively. It was uncovered that bioleaching bacteria can be intercepted by interfacial emulsion of solvent extraction to make their population in the raffinate lower and the efficiency of bioleaching decrease consequently.

Effects of Strong-Acid on Performances of Copper Solvent Extraction

2014 ◽  
Vol 881-883 ◽  
pp. 48-51 ◽  
Author(s):  
Yan Jun Liu ◽  
Xiao Rong Liu ◽  
Hui Li ◽  
Qing Li ◽  
Yong Sheng Li ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Solvent Extraction ◽  
Physical Properties ◽  
Organic Phase ◽  
Contact Time ◽  
Strong Acid ◽  
Copper Extraction ◽  
Concentrated Sulfuric Acid ◽  
Copper Solvent Extraction ◽  
Average Size

This paper studied the effect of strong acid---concentrated sulfuric acid---on organic phase physical properties, copper extraction rates as well as phase behaviors in the process of copper solvent extraction. Results demonstrate that with the increase of contact time between organic phase and concentrated sulfuric acid, the organic phase density and viscosity slightly decreased, copper extraction rate linearly decreased from 99.8% to 99.5%, and the average size of organic phase droplet in raffinate cyclically trended to decrease. When the contact time is less than 20 hrs, phase disengagement rate decreased slowly. However, further increasing the contact time the phase disengagement rate decreased rapidly. Organic phase physical properties have little effect on phase disengagement rate.

Recovery of Copper from Bio-Leaching Solutions of Waste Printed Circuit Boards Waste by Solvent Extraction Using RE609 and N902

2010 ◽  
Vol 113-116 ◽  
pp. 2228-2231 ◽  
Author(s):  
Cheng Long Zhang ◽  
Wang Dong Fang ◽  
Yu Chen ◽  
Jing Wei Wang ◽  
Jian Feng Bai
Keyword(s):  
Solvent Extraction ◽  
Printed Circuit Boards ◽  
Ph Value ◽  
Copper Extraction ◽  
Equilibration Time ◽  
Circuit Boards ◽  
Extractant Concentration ◽  
H2so4 Concentration ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards

According to the properties of bioleaching solutions of printed circuit boards (PCBs), copper(Ⅱ) in the leaching solution were recovery by solvent extraction with N902 and RE609. The influence of equilibration time，extractant concentration，O/A ratios，pH value on copper(Ⅱ) extraction and sulphuric acid concentration on copper(Ⅱ) stripping had been studied. Extraction of copper increased with increasing extractant concentration with both the extractants. More than 97.45% of copper can be extracted from a typical bioleaching solution of PCBs after copper extraction was carried out using 10% N902 diluted in kerosene at O/A ratio of 1:1, while 97.14% of copper can be extracted using 20% RE609 diluted in kerosene at O/A ratio of 1:1. The stripping of copper loaded N902 and RE609 increased with increasing H2SO4 concentration, but stripping of the latter was lower than the former.More than 93.57% and 90.29%of copper can be stripped from the loaded N902 and RE609 stripped at 1:1 phase ratio with 1.8 M H2SO4 in a single stage.

scholarly journals Copper solvent extraction from chalcopyrite concentrate acid leach solutions by LIX 984

2006 ◽  
Vol 42 (1) ◽  
pp. 1-11
Author(s):  
K. Elamari ◽  
E.A. Jdid ◽  
P. Blazy
Keyword(s):  
Solvent Extraction ◽  
Sulphuric Acid Solution ◽  
Leach Solution ◽  
Copper Production ◽  
Copper Extraction ◽  
Solid Product ◽  
Acid Leach ◽  
Concentrate Acid ◽  
Hydrometallurgical Treatment ◽  
Chalcopyrite Concentrate

Copper production from ores or sulphide concentrates is classically realized by pyrometallurgical route. In this study, hydrometallurgical treatment of a copper sulphide concentrate, provided by Hajar Mine (ONA-Group, Morocco), was tested by using a mixture of nitric and hexafluorosilicic acids. Copper is present in the solid product as chalcopyrite and its amount is 28.1 % by weight. Leaching stage allows to dissolve more than 90% of copper witch is accompanied, in the same averages, by Zn and Fe. The leach solution obtained has pH = 0.6 and Eh = 580 mV/ENH and contains 19.3 g/L Cu, 18.1 g/L Fe, 4.5 g/L Zn and 0.03 g/L Pb. The recovery of copper from this leach solution was curried out by solvent extraction using Lix 984, diluted in Escaid 110. McCabe - Thiele distribution isotherms showed that at pH 1.7 total and selective copper extraction can be realized with ?o:?a =1.5:1 in 3 extraction stages. Stripping of the loaded copper by treating the organic phases was easily obtained by a sulphuric acid solution.

scholarly journals Hydrodynamic Performance of a Pulsed Solvent Extraction Column with Novel Ceramic Internals: Holdup and Drop Size

2017 ◽  
Vol 56 (4) ◽  
pp. 999-1007 ◽  
Author(s):  
Heng Yi ◽  
Yong Wang ◽  
Kathryn H. Smith ◽  
W. Y. Fei ◽  
Geoffrey W. Stevens
Keyword(s):  
Solvent Extraction ◽  
Drop Size ◽  
Hydrodynamic Performance ◽  
Extraction Column
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