Investigation of Properties of Zinc Plant Residue Mechanically Activated in Two Types of Mills
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MINERAL DRESSING
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Investigation of Properties of Zinc Plant Residue Mechanically Activated in Two Types of Mills M. D. Turana* and P. Balazb a
Fırat University, Department of Metallurgical and MaterialsEngineering, Elazığ, 23119 Turkey *e-mail: [email protected] b Institute of Geotechnics, Slovak Academy of Sciences, Košice, 04353 Slovakia Received March 11, 2019 Revised August 10, 2019 Accepted April 10, 2020
Abstract—Extended milling/mechanical activation properties of zinc plant residue was investigated using two different milling systems, namely, high speed vibrating ball mill and ring mill, comparatively. The zinc plant residue was mixture of gypsum, anglesite, massicot, quartz, maghemite, and franklinite. Zinc plant residue was milled for 1–30 min in high speed vibrating ball mill and ring mill. The obtained samples were characterized using XRD, SEM, particle size distribution, and N2-BET methods. According to results, it was found that the ring mill caused a further decrease in particle size. Particle size distribution and N2-BET analyses showed that agglomeration of particles began after 15 min and 5 min milling time for HSBVM and ring mill, respectively. Keywords: Mechanical activation, zinc, ring mill, high speed vibrating ball mill. DOI: 10.1134/S1062739120026770
INTRODUCTION
During the production of most metals, minerals must be initially liberated from ores to obtain high metal extraction. The comminution process starts with explosion in mine, continues with crushing and ends with grinding. Treatment of liberated minerals can be influenced by various methods including intensive. It is stated in [1, 2] that mechanical activation is mentioned on conditions of intensive milling of particles in which, if particles have chemical conversion, it is called mechanochemical processing. High-energy mills are used to achieve this conversion, so that reactivity of particles increases. Primary effects of mechanical activation are a decrease in particle size, an increase of surface area, an increase in internal and surface energy, and a decrease of the coherence energy of the solids. Secondary processes such as aggregation, adsorption and recrystallization can occur during and after milling has taken place [3, 4]. During grinding in energy intensive mills, physicochemical and structural properties of particles are changed. In this process, firstly, surface layer is changed and structural defects concentrated on particle surface are accompanied by amorphization (Fig. 1) [5, 6]. Zinc is produced from sulphide and oxide-carbonate ores using hydrometallurgical and/or pyrometallurgical methods. In the most common hydrometallurgical zinc process, a large amount of zinc leaching residue is
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