This report presents information on the state-of-the-art of metals recovery technologies to assist in identifying waste-management options for metalbearing sludges and wastewaters that may be regulated under the Resource Conservation and Recovery Act (RCRA). Only a few of the technologies addressed In this report (e.g., electrowinnlng, high-temperature metals recovery (HTMR]) are directly appli...

In the present investigation, selective recovery of nickel from a leach solution delaminated metal clads obsolete mobile phone PCBs using industrial reagent ACORGA M5640 has been studied. As first step, copper is selectively separated mixed liquor by solvent extraction at pH 2, to leave nickel-rich raffinate solution. A second stage process conducted 8 then permits nickel. Small quantities zinc...

Analysis of a Brucella suis 1330 gene fused to a gfp reporter, and identified as being induced in J774 murine macrophage-like cells, allowed the isolation of a gene homologous to nikA, the first gene of the Escherichia coli operon encoding the specific transport system for nickel. DNA sequence analysis of the corresponding B. suis nik locus showed that it was highly similar to that of E. coli e...

The accessory protein CooC, which contains a nucleotide-binding domain (P-loop) near the N terminus, participates in the maturation of the nickel center of carbon monoxide dehydrogenase (CODH). In this study, CooC was purified from the chromatophore membranes of Rhodospirillum rubrum with a 3,464-fold purification and a 0.8% recovery, and its biochemical properties were characterized. CooC is a...

SYNOPSIS To conserve fresh water resources and comply with environmental regulations, DRDGOLD, a South African gold producer re-treating surface tailings, has transitioned to fully closed circulation system. Consequently, the accumulation of contaminants, as well addition reagents, led changes in composition that have compromised leach performance overall recovery. A two-sample t-test confirmed...

In the present work, a new ligandless-ultrasound-assisted emulsification microextraction (LL-USAEME) method was developed for preconcentration trace amounts of nickel as a prior step to its determination by flame atomic absorption spectrometry. Some factors influencing the extraction efficiency of nickel and its subsequent determination were studied and optimized, such as type and volume of the...

Processes for recycling lithium ion batteries (LIB), in particular complex chemistries such as those containing nickel-manganese-cobalt oxide (NMC) cathodes are hindered by tradeoffs between capital cost, process sustainability, and materials recovery. Most metal separations primary secondary production of critical elements rely on anion exchange chemistries. Herein, we explore the application ...