Results 181 to 190 of about 8,465 (222)

Leaching of Glauconitic sand stone in acid lixiviants

Minerals Engineering, 1992
Abstract Laboratory studies have been conducted on acid leaching as a possible route for extraction of potassium from Glauconitic sandstone, a secondary source of potassium. The effect of temperature, concentration and type of acids, strirring speed and leaching time on potassium dissolution have been investigated.
V.P. Yadav, T. Sharma
openaire   +1 more source

Lixiviation Effects In Glass Polishing

SPIE Proceedings, 1989
From our glass polishing process of precision optics we know that its physical-chemical nature frequently leads to a complex interaction of several parameters determining the process and the resulting quality. Surface analysis using SIMS and WDX prove that surface and sharp edge polishing of integrated optics chips has to be watched critically in order
openaire   +1 more source

Aqueous lixiviants: Principle, types, and applications

JOM, 2007
Aqueous lixiviant is a leach liquour capable of dissolving all or part of ore or concentrate. It plays a critical role in the hydrometallurgical process. Although cyanide leaching of gold and silver has demonstrated success in the industry for 100 years, searching for innovative lixiviants to leach gold, copper, and other heavy metals effectively ...
openaire   +1 more source

Neutron diffraction study of lixiviated nanocrystalline Mg–Li compound

Journal of Alloys and Compounds, 1999
Abstract The ball milled nanocrystalline Mg 72 Li 28 compound before and after lixiviation in water was investigated by neutron and X-ray scattering. The specific surface area before and after treatment was precisely measured. The crystallographic parameters were extracted by Rietveld refinement.
J Huot, I.P Swainson, R Schulz
openaire   +1 more source

Urban Mining of Precious Metals with Cyanide as Lixiviant

2021
This chapter is devoted to investigations and developments in precious metal leaching from urban mines using cyanide as lixiviant. Factors affecting platinum, palladium, gold, and rhodium leaching are the characteristics of the particular reagent and process chemistry. Extraction mechanisms are discussed in depth. The cyanide leaching order of platinum,
Rajiv Ranjan Srivastava, Sadia Ilyas, Nimra Ilyas, Hyunjung Kim   +3 more
openaire   +1 more source

Electrochemical cleaning of soil contaminated with a dichromate lixiviant

International Journal of Mineral Processing, 2003
Abstract Experiments are conducted on kaolin contaminated with a lixiviant obtained from a sodium dichromate plant residue to demonstrate the efficacy of electrochemical cleaning. After 120 h, only 36% chromium is removed from the soil. Chromium removal is high in the first 20 h, after which it falls drastically.
M Manna, K Sanjay, R Shekhar
openaire   +1 more source

Alternative Lixiviant for Copper Leaching from Chalcopyrite Concentrate

2018
This study investigated leaching kinetics by alternative lixiviants for copper leaching from chalcopyrite (CuFeS2), the most abundant copper resource in the world. As a refractory sulfide mineral, chalcopyrite shows low copper extraction due to passivation on chalcopyrite surface.
Junmo Ahn, Jiajia Wu, Jaeheon Lee
openaire   +1 more source

Lixiviants for primary gold and/or copper production

JOM, 2007
These days, when a s k e d “ W h a t exactly does a metallurgical engineer do?” the answer can range anywhere from mineral processing to chemical processing to material science. The answer you give is usually dependant on what area of the world you are in, which industry you are currently employed in, and where and in what decade you attended college ...
openaire   +1 more source

Dissolution Chemistry of Gold and Silver in Different Lixiviants

Mineral Processing and Extractive Metallurgy Review, 1988
Cyanide has been recognized for a long time as a powerful lixiviant for gold and silver, forming very stable cyano complexes with both metals.
J. BRENT HISKEY, V. P. ATLURI
openaire   +1 more source

Contribution à l'étude de la lixiviation de la chalcopyrite

Hydrometallurgy, 1982
Abstract A study of the kinetics of chalcopyrite dissolution in sulfuric acid medium under oxygen pressure of 70 psia (0.48 MPa) was made on a chalcopyrite concentrate as function of acid concentration, temperature, and grain size. An evaluation of the real surface, an examination of the surface of the grains by scanning electronic microscope, and an
Roland Le Houillier, Edward Ghali
openaire   +1 more source