Kinetics of the Oxidative Roasting of Low Grade Mongolian Molybdenite Concentrate

Abstract

Molybdenite concentrate is the major mineral for the molybdenum industry. The industrial processing of molybdenite concentrate is first to convert to technical grade molybdenum trioxide by its oxidative roasting, followed by its purification by distillation or its ammonia leaching. In the present research, detailed experimental results for the oxidative roasting of low grade Mongolian molybdenite concentrate are presented. The experiments were carried out in the temperature range of 778 to 838 K under air atmosphere by using a thermogravimetric analysis technique. The particle size of the molybdenite concentrate was varied between 53 and 103 mm. As an example of the oxidative roasting of low grade Mongolian molybdenite concentrate, more than 95% of 53 mm particle size molybdenite was converted to molybdenum trioxide in 40 min at 823 K. The Jander equation was found to be useful in describing the rates of the oxidative roasting, which had an activation energy of 215.0 to 259.3 kJ/mol (51.4 to 62.0 kcal/mol) for various sizes, such as 53 mm, 67 mm and 103 mm.

A comparative human health, ecotoxicity, and product environmental assessment on the production of organic and silicon solar cells

“…Oxides of molybdenum do not occur in large amounts in nature but rather as sulfides (e.g., molybdenite). Production of MoO 3 was modeled by roasting molybdenite at high temperatures in the presence of oxygen (see supporting information). The amount of MoO 3 was estimated to be 0.24 g/m 2 .…”

Investigation of chalcopyrite removal from low-grade molybdenite using response surface methodology and its effect on molybdenum trioxide morphology by roasting

“…Technical grade molybdenum trioxide (MoO 3 ) is one of the initial substances used in a variety of industrial applications such as the production of molybdenum metal, ferromolybdenum alloy, 3 batteries, sensors and electronic display devices, field emission, gas-chromic, photo-chromism devices, as well as the development of catalysts for petroleum and petrochemical industries because of its catalytic properties. 30,31 Roasting is frequently used in the production of molybdenum trioxide from molybdenite concentrate.…”

“…2 The crude material is converted into technical grade molybdenum trioxide by oxidative roasting in an air atmosphere in the presence of sodium chloride, lime or soda ash and is followed by purication by chemical leaching. [3][4][5] Copper is typically found in nature as a sulde, oxide, carbonate, or silicate mineral. 6 The most signicant copper sulde mineral is chalcopyrite.…”

Investigation of the Roasting Behavior of Mixtures of Molybdenum Trioxide and Molybdenum Concentrates

“…Considering the shortcomings of the traditional process, researchers have studied strategies for extracting molybdenum from molybdenum concentrate, which comprise pyrometallurgical and hydrometallurgical processes. At present, research on the pyrometallurgical process of molybdenite mainly focuses on oxidation roasting, − microwave roasting, − direct pyrolysis, − and reduction roasting . Oxidation roasting is further classified into sodium/calcification roasting − and chlorination roasting. , Sodium/calcification roasting is currently the most widely used additive roasting process.…”