Role of dissolved mineral species in quartz flotation and siderite solubility simulation
Jian Liu
1,2
1
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology
2
Faculty of Land and Rescource Engineering, Kunming University of Science and Technology
3
Faculty of Minerals Processing and Bioengineering, Central South University
Publication date: 2017-05-25
Corresponding author
Ximei Luo
Kunming University of Science and Technology, Faculty of Land and Rescource Engineering, Kunming University of Science and Technology, Kunming, 650093 Kunming, China
Kunming University of Science and Technology, Faculty of Land and Rescource Engineering, Kunming University of Science and Technology, Kunming, 650093 Kunming, China
Physicochem. Probl. Miner. Process. 2017;53(2):1241-1254
KEYWORDS
TOPICS
ABSTRACT
Quartz is, in most cases, the major gangue mineral found in the iron ores. Although it can be activated by calcium at strong alkaline pH, quartz nevertheless, reports to the concentrate with Fe when the iron ores contain siderite. It causes a poor concentrate grade and separation between quartz and iron minerals. The effect of siderite on reverse anionic flotation of quartz from hematite was studied in our previous investigations. In this work, the effect of siderite dissolution on the quartz recovery in the froth product and the effect of pH, ions and temperature on siderite dissolution were investigated. Microflotation, PHREEQC simulation, solution chemistry calculation and Fourier transform infrared spectroscopy (FTIR) measurements were conducted. It was observed that the dissolved species of siderite exhibited negative impact on quartz flotation. This influence became weak to some extent by either stripping the dissolved species or shortening dissolution time. Siderite was easily dissolved in the presence of calcium ion under strong alkaline conditions and its solubility increased with increasing the calcium ion concentrate and temperature. When the calcium ion was added as an activator of quartz under strong alkaline conditions (pH>9.96), calcium existed mainly in the CaCO3 precipitation form according to the solubility rule in the presence of siderite. This form could adsorb onto quartz surfaces and further the chemical reaction between starch and quartz was monitored by FTIR measurements. This study provides a further supplement for previous study. A potential strategy is suggested that finding a collector used at low temperature or flotation under neutral (or weak alkaline) medium is helpful to the reverse flotation of iron ores containing siderite.
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