Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Determination of ZnO Amount in Electric Arc Furnace Dust and Temperature Dependence of Leaching in Ammonium Carbonate by Using of X-Ray Diffraction

Havlik T., Maruskinova G., Miskufova A.

Archives of Metallurgy and Materials

2018

Vol. 63, iss. 2

653--658

Zinc is present in electric arc furnace dust (EAFD) mainly in two basic minerals, namely as franklinite ZnFe2O4 and/or zincite ZnO. While zincite is relatively reactive and easily treatable, franklinite is considerably refractory, which causes problems during EAFD processing. In this work EAFD containing 18.53% Zn was leached in water solution of ammonium carbonate. This leaching solution selectively leaches zincite, while franklinite is refractory and stable against leaching in this case. The temperature dependence of zinc leaching from EAFD was studied and the activation energy EA was determined by two methods: 1.) classically based on zinc chemical analyses from the leaching solution and 2.) by using of X-Ray diffraction qualitative phase analyses of leaching residues. The determined values of activation energies 37.41 and 38.55 kJmol-1 match perfectly, which show the excellent possibility of using X-Ray diffraction toward the study of leaching kinetics at properly chosen experimental conditions. The important result is the determination of the amount zincite and franklinite in EAFD, which is not possible by using of classical chemical methods.

Hydrometallurgical methods of indium recovery from obsolete LCD and LED panels

Kristofova P., Rudnik E., Miskufova A.

Metallurgy and Foundry Engineering

2016

Vol. 42, no. 3

157--170

This paper shows a review of literature data on the possibilities of indium recovery from ITO layers of waste LCD and LED displays. A short characterization of indium, its compounds, resources, production, and applications is presented. The structure and operation of LCD displays are shown. A detailed overview of the ITO leaching process is presented. Methods of indium(III) ion separation from the leachate solutions (SX, HoLLE, IX) as well as recovery of the final products (precipitation, cementation, electrowinning) are also shown.

Artykuł przedstawia przegląd literatury na temat odzysku indu z warstw ITO w zużytych panelach LCD i LED. Przedstawiono krótką charakterystykę indu, jego związków chemicznych, zasobów, produkcji i zastosowań. Omówiono budowę i zasadę działania paneli LCD. W sposób szczegółowy opisano proces ługowania ITO. Przedyskutowano także metody rozdziału jonów indu(III) z roztworów po ługowaniu (SX, HoLLE, IX) oraz odzysku produktów końcowych (strącanie, cementacja, elektroliza).