Effect of alkalinity on flotation behavior of quartz

Sayılgan, Aslı Halime
Carbonates are always present in natural waters, thus in the process waters in flotation. When CO2 dissolves in water it forms a weak acid. This acid and its salts in solution constitutes the carbonic system. The pH of natural waters on land is controlled mainly by this system. Alkalinity is the capacity of a water to neutralize strong acids. In natural waters, this capacity is attributable to bases such as HCO3, CO3" and OH" as well as to species often present in small concentrations such as silicates, borates, ammonia, phosphates and organic bases. In general, alkalinity originates from the total amount of carbonates in water. Alkalinity of natural waters varies both with the temperature and ratios of source waters. The changes in alkalinity affect the chemistry of natural waters and also the process waters open to atmosphere. Mineral processing operations in general and flotation in particular are expected to be affected by these changes. In this study, the effect of alkalinity on flotation behavior of quartz was investigated. Alkalinity of process waters was adjusted in two different ways, namely by NaHC03 addition and by dissolving CO2 in test waters by equilibrating with air. Flotation tests were conducted both by a cationic amine type collector and by Na-oleate in the presence of Ca2+ ions. The results of the study showed that, at high alkalinity level, both cationic and anionic flotation of quartz were adversely affected.


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Citation Formats
A. H. Sayılgan, “Effect of alkalinity on flotation behavior of quartz,” M.S. - Master of Science, Middle East Technical University, 2003.