Results 21 to 30 of about 5,347,175 (310)
Processing of spent NiW/Al2O3 catalysts
Química Nova, 2013 Spent oxidized (500 ºC, 5 h) commercial NiW/Al2O3 catalysts were processed using two different routes: a) fusion with NaOH (650 ºC, 1 h), the roasted mass was leached in water; b) leaching with HCl or H2SO4 (70 ºC, 1-3 h). HCl was the best leachant.
Jéssica Frontino Paulino +2 more
doaj +1 more source
Thermal Processing of Jarosite Leach Residue for a Safe Disposable Slag and Valuable Metals Recovery
Metals, 2018 In electrolytic production of zinc, the iron levels in the solutions are controlled by precipitation of jarosite or goethite. These precipitates also co-precipitate unrecovered valuable metals (Zn, Pb, Cu, Ag) as well as elements of concern (As, Cd, Hg).
Minna Rämä +5 more
doaj +1 more source
Membranes, 2014 Two nanofiltration membranes, a Dow NF 270 polyamide thin film and a TriSep TS 80 polyamide thin film, were investigated for their retention of ionic species when filtering mine influenced water streams at a range of acidic pH values. The functional iso-
Mark Mullett +2 more
doaj +1 more source
Processes, 2021 A major part of Swiss fly ashes (FA) from municipal solid waste incineration (MSWI) are treated with the acid fly ash leaching process (FLUWA) in order to recover heavy metals prior to deposition.
Gisela Weibel +3 more
semanticscholar +1 more source
Maleic, glycolic and acetoacetic acids-leaching for recovery of valuable metals from spent lithium-ion batteries: leaching parameters, thermodynamics and kinetics [PDF]
Royal Society Open Science, 2019 Environmentally friendly acid-leaching processes with three organic acids (maleic, glycolic and acetoacetic) were developed to recover valuable metals from the cathodic material of spent lithium-ion batteries (LiCoO2). The leaching efficiencies of Li and
Borui Liu +7 more
doaj +1 more source
Frontiers in Microbiology, 2023 Metal recycling is essential for strengthening a circular economy. Microbial leaching (bioleaching) is an economical and environmentally friendly technology widely used to extract metals from insoluble ores or secondary resources such as dust, ashes, and
Sabine Spiess +7 more
doaj +1 more source
The Effect of Different Additives and Medium on the Bioleaching of Molybdenite for Cu and Mo Extraction Using Mix Mesophilic Microorganism [PDF]
International Journal of Mining and Geo-Engineering, 2013 Bioleaching processes for extraction of Cu and Mo from molybdenite cons. are more environmentally friendly and consume less energy than conventional technologies, yet less economically efficient.
Hadi Abdollahia +5 more
doaj
Chemistry–MethodsThe quest toward the development of new, more eco‐friendly removal/recycling/recovery methods for a range of valuable elements is intense nowadays. In this Review we present and discuss in a critical way the best available physicochemical processes ...
S. Mourdikoudis, X. Dominguez-Benetton
semanticscholar +1 more source
Recent Monitored Factors and Reactor's Configuration for Enhancing Contamination Treatment by Photo-Electro-Catalysis Process [PDF]
Iranian Journal of Chemistry & Chemical EngineeringPhoto-electro-catalysis process has received major attention in the past decade as a substitutional wastewater treatment technology. Photo-electro-catalysis process is widely employed for removing different pollutants (organic, and inorganic (cationic ...
Ghazal Ebraheim +2 more
doaj +1 more source
Efficient dealkalization of red mud and recovery of valuable metals by a sulfur-oxidizing bacterium
Frontiers in Microbiology, 2022 Red mud (RM) is a highly alkaline polymetallic waste generated via the Bayer process during alumina production. It contains metals that are critical for a sustainable development of modern society.
Duo-rui Zhang +12 more
doaj +1 more source