Author(s):
1. Nada Štrbac, Univerzitet u Beogradu, Tehnički fakultet u Boru, Serbia
2. Dragana Živković, Univerzitet u Beogradu, Tehnički fakultet u Boru, Serbia

Abstract:
Molybdenum is widely used in modern technology in the pure metal form and especially in the form of various alloys, primarily as alloy steel (molybdenum steel). It is used in the various parts in the automotive and aerospace industry. As a pure metal, molybdenum is used for development of anti-cathode and cathode X-ray tube, various parts of high-vacuum amplifiers, etc. Molybdenum can also be used as structural material in nuclear power reactors. In nature, molybdenum can be found in about twenty different minerals. The most important of them, which is the main carrier of molybdenum in the ores that are being processed nowadays, is molybdenite. Molybdenite rarely occurs alone as a valuable mineral, but more often with wolframite and scheelite in wolframite based ores, or as a companion of copper sulphide ores. MoS2 is an excellent lubricant that can be used in a wide temperature range. Molybdenum sulfides, and other its compounds thereof, are characterized by high catalytic activity and selectivity, where MoS2 represents a semiconductor material with excellent photostability and low toxicity. Molybdenum ore processing technology is based on the molybdenite characteristics. Oxide ores in total production haven’t got important economical significance. Technological procedures for the sulphide ore processing are based on the following fundamental stages: ore crushing, flotation and obtaining of the molybdenum concentrate, processing and obtaining molybdenum oxide from molybdenum sulphide concentrates and the pure metal molybdenum production and its components. In this paper, the results of experimental investigations of the molybdenum sulfide oxidation with oxygen from the air are presented. Kinetic studies of the oxidation were carried out using isothermal kinetics in the temperature range 300-700ºC. DTA, XRD, and EDXRF spectroscopy confirmed the mechanism of the process, which is determined by the previous thermodynamic and kinetic analysis.

Key words:
molybdenum sulphide, oxidation, kinetics and mechanism

Thematic field:
SYMPOSIUM A: Science of matter, condensed matter and physics of solid states

Date of abstract submission:
30.05.2013.

Number of visits:
153

Conference:
Contemporary Materials - 2013 - Savremeni materijali

Applied paper from author