Results 11 to 20 of about 16,833 (252)

Environmentally friendly method for regeneration of copper chloride acidic solutions used in etching of printed circuits [PDF]

open access: yesE3S Web of Conferences, 2017
Etching of copper with acidic CuCl2 solution is a widely used chemical method in printed circuits production. During the process, the solution is enriched in Cu(I) ions, resulting in reduction and then loss of etching bath capacity.
Kopyto Dorota   +7 more
doaj   +1 more source

An environmentally friendly method for efficient atmospheric oxidation of pyrrhotite in arsenopyrite/pyrite calcine

open access: yesChemical Engineering Journal Advances, 2021
Pyrite and arsenopyrite are the most common hosts for invisible gold, but pyrite and arsenic are refractory during conventional sulfide oxidation, which significantly challenges subsequent gold extraction.
Lin Li   +3 more
doaj   +1 more source

Assessment of environmental sustainability of nickel required for mobility transition

open access: yesFrontiers in Chemical Engineering, 2023
Nickel (Ni) in batteries (e.g., nickel-metal hydride battery (NiMH), lithium nickel cobalt aluminum oxide (NCA) and lithium nickel manganese cobalt oxide (NMC)) aim to ensure higher energy density and greater storage capacity.
Saeed Rahimpour Golroudbary   +3 more
doaj   +1 more source

Sulfur enhancement effects for uranium bioleaching in column reactors from a refractory uranium ore

open access: yesFrontiers in Microbiology, 2023
The feasibility of sulfur enhancement for uranium bioleaching in column reactors was assessed with a designed mixed Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans and Leptospirillum ferriphilum from a refractory uranium ore.
Qian Li   +17 more
doaj   +1 more source

Hydrometallurgical extraction of Al and Si from kaolinitic clays [PDF]

open access: yes, 2017
Herein is presented the results of a study on the hydrometallurgic extractionand recovery of aluminum and silicon by leaching of kaolinitic clays with HF. Thestudied extraction parameters were: temperature, reaction time, solid/liquid ratio,concentration,
Pinna, Eliana Guadalupe   +3 more
core   +3 more sources

Application of Ion Exchange for Preparation of Selected Metal Perrhenates—Precursors for Superalloy Production

open access: yesMetals, 2019
Methods for the preparation of selected metal perrhenates and their mixtures are presented in this paper. These materials are suitable for reduction, and therefore for production of alloy powders containing rhenium and other superalloy components, i.e ...
Katarzyna Leszczyńska-Sejda   +4 more
doaj   +1 more source

Leaching of pure chalcocite in a chloride media using sea water and wastewater [PDF]

open access: yes, 2019
Chalcocite is the most important and abundant secondary copper ore in the world with a rapid dissolution of copper in an acid-chloride environment. In this investigation, the methodology of surface optimization will be applied to evaluate the e_ect of ...
Briceño Romero, Williams   +6 more
core   +2 more sources

Method of Preparation for High-Purity Nanocrystalline Anhydrous Cesium Perrhenate

open access: yesMetals, 2017
This paper is devoted to the preparation of high-purity anhydrous nanocrystalline cesium perrhenate, which is applied in catalyst preparation. It was found that anhydrous cesium perrhenate with a crystal size <45 nm can be obtained using cesium ion ...
Katarzyna Leszczyńska-Sejda   +4 more
doaj   +1 more source

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