scholarly journals Lead Electrodeposition from Triethylenetetramine Solution Containing Inhibitors

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1330
Author(s):  
Mateusz Ciszewski ◽  
Szymon Orda ◽  
Michał Drzazga ◽  
Patrycja Kowalik ◽  
Łukasz Hawełek ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Lead Sulfate ◽  
Main Process ◽  
Promising Candidate ◽  
Lead Carbonate ◽  
Lead Recovery ◽  
Mineral Acids ◽  
Lead Metal ◽  
Direct Electrodeposition ◽  
Bone Glue

Lead can be efficiently electrodeposited from a number of common leaching agents such as mineral acids, carboxylic acids, and bases (hydroxides and ammonia). This paper reports the possibility to deposit lead from a triethylenetetramine solution, which is also a powerful extracting agent for lead sulfate. The high affinity of triethylenetetramine towards lead sulfate molecules makes it a promising candidate for lead recovery from various solid materials, including industrial secondary resources, sewages, and wastes. A popular methodology that can be found in the literature to recover metal from amine is based on purging a solution with carbon dioxide, resulting in lead carbonate precipitation. Here, the direct electrodeposition of lead from an amine solution was reported. The effects of the main process parameters, i.e., current density, temperature, and presence of additives, were examined to enhance the product quality. Bone glue, ethylene glycol, and polyvinylpyrolidone were used as perspective inhibitors of dendritic lead formation. It was shown that the addition of ethylene glycol can significantly reduce their formation as well as discoloration resulting from amine, producing lead metal with a 99.9% purity.

scholarly journals Lead Recovery from Solid Residues of Copper Industry Using Triethylenetetramine Solution

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 546
Author(s):  
Mateusz Ciszewski ◽  
Andrzej Chmielarz ◽  
Zbigniew Szołomicki ◽  
Michał Drzazga ◽  
Katarzyna Leszczyńska-Sejda
Keyword(s):  
Lead Extraction ◽  
Pressure Leaching ◽  
Base Metals ◽  
Lead Carbonate ◽  
Pure Lead ◽  
Industrial Processing ◽  
High Temperature And Pressure ◽  
Lead Recovery ◽  
Temperature And Pressure ◽  
Increasing Temperature

Industrial processing of mineral ores and concentrates generates large amounts of solid residues, which can be landfilled or further processed to recover selected elements depending on its economical profitability. Pressure leaching is a technology enabling high recovery of base metals like copper and zinc, transferring others like lead and iron to the solid residue. High temperature and pressure of such leaching leads to formation of sparingly soluble lead jarosite (plumbojarosite). The load of lead landfilled as solid residues resulting from such operation is so big that its recovery is perspective and crucial for waste-limiting technologies. This paper is devoted to lead extraction from pressure leaching residues using triethylenetetramine solution and then its precipitation as a commercial lead carbonate. The highest obtained recovery of lead was 91.3%. Additionally, presented technology allows to manage and recycle amine solution and reuse solid products. Produced pure lead carbonate can be directly added to smelting, not increasing temperature within the furnace.

Lead recovery from spent lead acid battery paste by hydrometallurgical conversion and thermal degradation

2019 ◽  
Vol 38 (3) ◽  
pp. 263-270
Author(s):  
Wenke Liu ◽  
Qingwei Qin ◽  
Dengqi Li ◽  
Guangqiang Li ◽  
Yinjie Cen ◽  
...  
Keyword(s):  
Thermal Degradation ◽  
Lead Oxide ◽  
Lead Dioxide ◽  
Scanning Calorimetry ◽  
Lead Carbonate ◽  
Lead Acid Batteries ◽  
Novel Approach ◽  
Lead Recovery ◽  
Main Component ◽  
Lead Acid

Spent lead paste is the main component in lead-acid batteries reaching end of life. It contains about 55% lead sulphate and 35% lead dioxide, as well as minor amounts of lead oxide. It is necessary to recycle spent lead paste with minimal pollution and low energy consumption instead of the conventional smelting method. In this study, a novel approach involving hydrometallurgical desulphurisation and thermal degradation is developed to recover lead as PbO products from spent lead acid batteries. First, the desulphurisation effects and phase compositions of products with different transforming agents were compared, and the optimum conditions using (NH4)2CO3 as a transforming agent were determined. And then, the thermal degradation processes of both precursors lead carbonate and lead dioxide were investigated to prepare α-PbO, Pb3O4, and β-PbO products in argon and air atmospheres, respectively. Both the desulphurisation precursors and the calcination products were characterised by thermogravimetry and differential scanning calorimetry, X-ray diffraction, and scanning electron microscopy. The results showed that the lead oxide products were prepared, including α-PbO at 450°C in argon, Pb3O4 and β-PbO at 480°C and 620°C in air, respectively.

scholarly journals On the Treating of Lead Polluted Water: Flotation of Lead Colloidal Carbonate

2019 ◽  
Vol 54 (4) ◽  
Author(s):  
Francisco J. Tavera ◽  
Martín Reyes P. ◽  
Ramiro Escudero G. ◽  
Francisco Patiño C.
Keyword(s):  
Liquid Velocity ◽  
Aqueous Media ◽  
Surface Flux ◽  
Bubble Surface ◽  
Polluted Water ◽  
Lead Carbonate ◽  
Flotation Cells ◽  
Lead Recovery ◽  
Superficial Gas Velocity ◽  
Collector Concentration

The colloid flotation of lead carbonate in aqueous media is studied at pH 7. The flotation system consisted of five spargered flotation cells in a serial array. The flotation cells were operated under controlled conditions of superficial gas and liquid velocity, frother, and collector concentration. The measured variables were gas holdup, bubble size, superficial bubble surface flux, and lead recovery in the concentrate. The experimental data show that it is possible to separate up to 93% (w/w) of lead from the aqueous media when the superficial gas velocity is 0.8 cm/s and the superficial liquid velocity is 0.19 cm/s.  

scholarly journals Cadmium and lead recovery from yeast biomass

2011 ◽  
Vol 9 (2) ◽  
pp. 320-325 ◽  
Author(s):  
Edyta Kordialik-Bogacka
Keyword(s):  
Cadmium Removal ◽  
Lead And Cadmium ◽  
Yeast Biomass ◽  
Lead Recovery ◽  
Mineral Acids ◽  
Cadmium Adsorption ◽  
Cadmium And Lead

AbstractThe feasibility of the application of various eluents for recovery of lead and cadmium from Saccharomyces biomass has been investigated. Desorbing agents such as HCl, HNO3, H2SO4, Na2SO4, Na2CO3, EDTA and NaOH at concentrations of 0.05–0.5 M were used. The possibility of re-using of S. pastorianus for cadmium removal was assessed. Among the desorbing agents EDTA and mineral acids were the most effective, as approximately 85% of lead and cadmium could be recovered. However, when HNO3 and EDTA were used as desorbing agents, a dramatic loss in the cadmium adsorption by the biomass in the next cycles was observed.

Crystallization of barium hexaferrite

1992 ◽  
Vol 50 (1) ◽  
pp. 362-363
Author(s):  
Chung-kook Lee ◽  
Yolande Berta ◽  
Robert F. Speyer
Keyword(s):  
Size Distribution ◽  
Raw Materials ◽  
Barium Hexaferrite ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Promising Candidate ◽  
Crystallization Method ◽  
Temperature Heat ◽  
High Density Magnetic Recording ◽  
Temperature Heat Treatment

Barium hexaferrite (BaFe12O19) is a promising candidate for high density magnetic recording media due to its superior magnetic properties. For particulate recording media, nano-sized single crystalline powders with a narrow size distribution are a primary application requirement. The glass-crystallization method is preferred because of the controllability of crystallization kinetics, hence, particle size and size distribution. A disadvantage of this method is the need to melt raw materials at high temperatures with non-reactive crucibles, e.g. platinum. However, in this work, we have shown that crystal growth of barium hexaferrite occurred during low temperature heat treatment of raw batches.

PIEZOELECTRIC PROPERTIES OF POLY(3-HYDROXYBUTYRATE-CO-3-HEDROXYBUTYRATE)-CO-POLY(ETHYLENE GLYCOL) PRODUCED BY CONTROLLED MICROBIOLOGICAL BIOSYNTHESIS

2019 ◽  
Vol 10 (10) ◽  
Author(s):  
Anton Bonartsev ◽  
Vera Voinova ◽  
Elizaveta Akoulina ◽  
Andrey Dudun ◽  
Irina Zharkova ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Piezoelectric Properties ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene
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