Recovery of valuable metals and regeneration of acid from the leaching solution of spent HDS catalysts by solvent extraction

2013 ◽  
Vol 133 ◽  
pp. 161-167 ◽  
Author(s):  
Raju Banda ◽  
Thi Hong Nguyen ◽  
Seong Ho Sohn ◽  
Man Seung Lee
Keyword(s):  
Solvent Extraction ◽  
Valuable Metals ◽  
Hds Catalysts ◽  
Leaching Solution

scholarly journals Separation of Ag(I) by Ion Exchange and Cementation from a Raffinate Containing Ag(I), Ni(II) and Zn(II) and Traces of Cu(II) and Sn(II)

Processes ◽  
2018 ◽  
Vol 6 (8) ◽  
pp. 112 ◽  
Author(s):  
Wei Xing ◽  
Man Lee ◽  
Seung Choi
Keyword(s):  
Ascorbic Acid ◽  
Nitric Acid ◽  
Solvent Extraction ◽  
Ion Exchange ◽  
Anode Slime ◽  
Silver Particles ◽  
Copper Sheet ◽  
Agno3 Solution ◽  
Micron Size ◽  
Leaching Solution

Ion exchange and cementation experiments were done to separate silver(I) from a raffinate containing silver(I), nickel(II), and zinc(II) and small amounts of copper(II) and tin(II). The raffinate resulted from the recovery of gold(III), tin(II) and copper(II) by solvent extraction from a leaching solution of anode slime. Ion exchange with anionic resins was not effective in separating silver(I) because tin(II) and zinc(II) were selectively adsorbed into the anionic resins. It was possible to separate silver(I) by cementation with copper sheet. Treatment of the cemented silver with nitric acid solution increased the purity of silver(I) in the solution from 50.9% to 99.99%. Adjusting the pH of the AgNO3 solution to higher than 6, followed by adding ascorbic acid as a reducing agent, led to the synthesis of silver particles with micron size.

scholarly journals A Process for the Separation of Noble Metals from HCl Liquor Containing Gold(III), Palladium(II), Platinum(IV), Rhodium(III), and Iridium(IV) by Solvent Extraction

Processes ◽  
2019 ◽  
Vol 7 (5) ◽  
pp. 243 ◽  
Author(s):  
Wei Dong Xing ◽  
Man Seung Lee
Keyword(s):  
Solvent Extraction ◽  
Metal Ions ◽  
Noble Metals ◽  
The Other ◽  
Secondary Resources ◽  
Cyanex 272 ◽  
Leaching Solution ◽  
Hcl Concentration ◽  
Hcl Solution ◽  
Excellent Chemical

The demand for noble metals is increasing, owing to their excellent chemical and physical properties. In order to meet the demand, the recovery of noble metals with high purity from diverse secondary resources, which contain small amounts of noble metals, is of immense value. In this work, the possibility of the separation of Au(III), Pd(II), Pt(IV), Rh(III), and Ir(IV) by solvent extraction from a synthetic HCl solution is investigated. Only Au(III) was selectively extracted by Cyanex 272 in the HCl concentration range from 0.5 M to 9 M, leaving the other metal ions in the raffinate. The loaded Au(III) in Cyanex 272 was efficiently stripped by (NH2)2CS. The other four noble metals were sequentially separated on the basis of the procedures reported in the previous work. The mass balance showed that about 98% of each metal, except Pt(IV), was recovered by the proposed process. An efficient process for the recovery of the five noble metal ions from the HCl leaching solution of secondary resources containing these metals can be developed.

Gallium Mobilization in Soil by Bacterial Metallophores

2017 ◽  
Vol 262 ◽  
pp. 513-516 ◽  
Author(s):  
Rïngo Schwabe ◽  
Britta Obst ◽  
Marika Mehnert ◽  
Dirk Tischler ◽  
Oliver Wiche
Keyword(s):  
Solvent Extraction ◽  
Soil Bacteria ◽  
Paracoccus Denitrificans ◽  
Soil Matrix ◽  
Alternative Strategies ◽  
Sensor Development ◽  
Desferrioxamine B ◽  
Potential Source ◽  
Valuable Metals ◽  
Chelating Compounds

In the present study we explore the idea of biotechnologically produced metallophore mixtures as selective chelating compounds for economically valuable metals from various sources. A complex soil matrix with natural levels of metal mineralization was employed as a potential source of metals. We focused on gallium-chelating metallophore preparations of two soil bacteria (Gordonia rubripertincta CWB2 and Paracoccus denitrificans PD1222) which were compared to the commercially available desferrioxamine B (DFOB). As a reference, the binding of iron was analyzed. The herein described successful mobilization of metals such as gallium from soil provides first hints towards alternative strategies, such as phytomining, sensor development, or solvent extraction based on metallophores. The metallophore mixture produced by the strains showed best results at pH 8 and allowed to mobilize gallium about three times better as the pure commercially available DFOB.

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