Donetsk National Technical University, Donetsk, Donetsk People’s Republic/Ukraine:

Korchevskyi A. N., Head of the Department of Mineral Processing, Professor, Candidate of Engineering Sciences, korcheval737@gmail.com
Kholodov K. A., Post-Graduate Student

Kerch State Maritime Technological University, Kerch, Russia:

Nazimko L. I., Head of the Department of Marine Ecology, Professor, Doctor of Engineering Sciences

Donetsk National University, Donetsk, Donetsk People’s Republic/Ukraine:
Mazhan O. K., Post-Graduate Student

The article presents the industrial tests results on clarification of return water in gas cleaning system cycle at the oxygen-converter plant of ArcelorMittal Temirtau Iron & Steel Works. The authors show that the use of organic reagents of the series Flopam SNF provides high efficiency of sedimentation of suspended solids by enlarging the size of floccules, which accelerates their deposition as a result. At the same time, the quality of return water significantly improves, and return water is suitable for multi-use in industrial closed-loop water cycle. The settled solid phase in the form of fine dispersed particles represents the ironcontaining material with total iron content of up to 45%. This material can be returned to the production cycle provided that efficient technologies for its capture and enrichment are used. Reconstruction and modernization of wet gas cleaning sites at blast furnace and oxygen-converter plants will allow on-site production of to 20 million m³/year of industrial water without treatment and clarification in external settling pond. At the same time, the captured solid phase in the amount up to 35 thousand tons of the iron-containing material will have characteristics acceptable for the agglomeration cycle. The same volume will be withdrawn from the total solid phase storage in currently operating external sedimentation tanks. The introduction of the modifications will lead to essential decrease in volume of slime pumped to external settlers, which will cut down energy consumption and operational expenses of the gas cleaning site. Termination of the polluted water discharge will contribute to saving of water resources, efficient use of iron-containing raw material and enhancement of environmental protection in the region.

The authors are grateful to the personnel of the workshops and of the Water Body Protection Laboratory of the Environmental Department of ArcelorMittal Temirtau for their assistance, advice and participation in the testing.

1. Bolshina E. P. Ecology of metallurgical production Available at: http://nmetau.edu.ua/file/ktemp_15502.pdf (accessed: 9.08.2018).
2. Danilov-Danilyan V. I. Ecological problems: what happens, who is guilty and what to do? Moscow : MNEPU, 1997. 332 p.
3. Karmanov A. P., Polina I. N. Technology of sewage treatment. Education guidance. Syktyvkar, 2015. 208 p.
4. Korchevskyi A. N., Gumenyuk K. V., Nazimko L. I. Waste of metallurgical production. New technology solutions on complex processing : Materials of a Scientific and Practical Conference of Russia “Current problems of a biodiversity and environmental management”. 2017. pp. 227–233.
5. Fridman V. S. Global ecological crisis. Moscow, 2017. 444 p.
6. Banaś M. Development of the flocs’ structure during coagulation of the fine-grained suspensions. Polish Journal of Environmental Studies. 2012. pp. 45–49.
7. Brostow W., Pal S., Singh R. P. A model of flocculation. Materials Letters. 2007. No. 61. pp. 4381–4384.
8. Castellini E., Berthold C., Malferrari D., Bernini F. Sodium hexametaphosphate interaction with 2:1 clay minerals illite and montmorillonite. Applied Clay Science. 2012. No. 83-84. pp. 162–170.
9. Cehlr M. Evaluation and risk estimation by business with the earth’s resources. Proceedings of XVIII ICPC, Saint-Petersburg, Russia. Ed. V. Litvinenko. Switzerland : Springer Int. Publishing, 2016. pp. 463–468.
10. Kisielevska E., Surowiak A. Reseach Over bio-flocculation application in sedimentation of mineral suspension. Journal of the Polish Mineral Engineering Society. 2015 Vol. 16, No. 1(35). pp. 189–195.
11. Kowalski W. P., Banaś M., Kołodziejczyk K., Mięso R., Malcher T., Hilger B., Turlej T. Modern sedimentation techniques in environmental protection. WIMIR AGH Publisher. 2015. pp. 21–29.
12. Nazimko L. I., Garkovenko E. E., Korchevskyi A. N., Druts I. N. Kinetics of phases interaction during mineral processing simulation. Proceedings of XV ICPС. China, Beijing, 2006. pp. 785–798.
13. Nazimko L. I., Korchevskyi A. N., Rozanov Yu. A., Martianov S. V. Simulation of coal separation and dehydration processes. Proceedings of XVII ICPС. Turkey, Istanbul, 2013. pр. 495–501.
14. Ozkan A., Duzyol S. Gamma processes of shear flocculation, oil agglomeration and liquid liquid extraction. Separation and Purification and Technology. 2014. No. 132. pp. 446–451.