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Environmental protection technics and technology
ArticleName Assessment of ecological safety of flotation agents in hematite ore processing
ArticleAuthor Yurlova N. A., Shumskaya E. N., Kaifadzhyan E. A., Poperechnikova O. Yu.
ArticleAuthorData

RIVS-proekt:

Yurlova N. A., Principal Specialist, Doctor of Biological Sciences, e-mail: rivsproject@rivs.ru

 

RIVS Science and Production Association:

Shumskaya E. N., Principal Researcher, Candidate of Engineering Sciences, e-mail: rivs@rivs.ru

 

Mendeleev Institute for Metrology:

Kaifadzhyan E. A., Senior Researcher, Candidate of Engineering Sciences, e-mail: kayfadzhyan@rambler.ru

 

RIVS Science and Production Association:

Poperechnikova O. Yu., Head of subdivision, e-mail: rivs@rivs.ru

Abstract

RIVS accomplishes a whole range of work aimed at improvement of iron ore dressing tech nology and equipment. The scope of work includes flotation of magnetite concentrates toward enhancement of their quality, including production of super concentrates, and development of efficient processing technology for ferruginous quartzites. Cationic amine-bearing surface active substances (CABS) are widely used in hematite ore dressing. It is required to control CABS residual content as these substances are highly toxic and hazardous for the environment. The measurement of concentrations of flotation agents used spectrophotometric analysis (a simple, inexpensive but low selective method) and more selective technique of gas-liquid partition chromatography based on the certified procedures. It is recommended to carry out the production ecology monitoring using selective methods for estimating concentrations of flotation agents, including calculation of standards for allowable wastewater discharges in surface bodies or onto local terrain. The authors show that flotation-opposite process of CABS desorption can take place in tailings pulp slurry, which results in higher concentration of CABS in recirculated water. However, CABS undergo chemical transformation with time, and their concentration in recirculated water and in water phase in tailings ponds reduces. Decomposition of CABS runs more intensive under higher temperature. RIVS Science and Production Association carries out a wide range of work aimed at improvement of iron ore dressing technology and equipment. The scope of work embraces flotation of magnetite concentrates toward their quality refinement and production of superconcentrates, and development of efficient technology for oxidized ferruginous quartzite dressing. Concentration of hematite ore uses cation amine-containing surface active agents (AC SAA). It is required to control the remaining content of highly toxic and ecologically hazardous AC SAA. Concentration of flotation agents was measured using the spectrophotometric method (simple, inexpensive but less selective) and the selective method of gas–liquid partition chromatography based on certified procedures. The industrial environmental monitoring advises to use the selective methods to estimate concentration of flotation agents, including calculation of effluents treated to standard quality. The article shows that desorption of AC SAA can run in pulp slurry, which results in higher concentration of AC SAA in the recycling water. However, in the course of time, AC SAA undergo chemical transformation and their content in the recycling water and liquid phase of tailings reduces. The process of AC SAA decomposition intensifies under higher temperature.

keywords Hematite ore, flotation, amine-bearing surface active substances, flotation agents, spectrophotometric analysis, gas-liquid partition chromatography
References

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Full content Assessment of ecological safety of flotation agents in hematite ore processing
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