Study on Pre-Concentration and Calcium Removal of Low Grade Zinc Oxide Ore

Abstract

The zinc oxide sample from the Lanping mine located in the west of Yunnan province，China, is characterized with low grade, high calcium content, high oxidation rate and heavy slime. According to the properties of the ore, a new dressing-metallurgy combined method is proposed to process the ore and the beneficiation part is discussed by this paper. Based on the regulation of reagent scheme, flotation flowsheet of pre-desliming and two rougher is conducted to obtain a zinc concentrate that Zn grade is 18.72% at Zn recovery of 90.88%. The calcium removal rate of zinc concentrate reaches to as high as 78.15% for the flotation operation, which could lay the foundation for the next acid leaching process.

Study on Treatment of Ammonia Nitrogen Waste Water by Zeolite-Granule-Adsorbent

“…According to Jian-chang Li [5] who obtained data on the zeolite samples from JinYun and GongYi, it is apparent that those two studies have the same trend, except the prolonged time spent on the zeolite-granule-adsorbent adsorption, caused by the decreased total surface area and an increase in the diffusion path length with the zeolite immobilized to beads.…”

“…Many kinds of ZGA contained of organic binder are friability, fragile or low-exchange capacity [3]. In addition, most existing investigations of zeolites' ammonium removal are about Clinoptilolite and Mordenite, other kinds like Heulandite are less studied [4,5]. Thus, this paper studied the static ammonium removal by Heulandite-granule-adsorbent and the theoretical aspects of adsorption including adsorption isotherm, kinetics as well as thermodynamics to provide theoretical basis to ammonium removal by adsorbent.…”

LEACHING Zn FROM THE LOW-GRADE ZINC OXIDE ORE IN NH3-H3C6H5O7-H2O MEDIA

“…The leach-solvent extraction-electro-winning process route is the most common method of extraction of zinc from low-grade zinc oxide ores (de Wet and Singleton, 2008). This is a material which can be processed by flotation (Irannajad et al, 2009;Navidi Kashani and Rashchi, 2008;Li et al, 2013) and acid-leaching methods (Irannajad et al, 2013;Xu et al, 2010;Xu et al, 2012;He et al, 2010;He et al, 2011). However, sulfuric acid leaching could not effectively recover zinc from a low grade oxide ore because of substantial iron dissolution (Yang et al, 2013).…”