Study of rinsing wastewater purefication from zinc ions by magnetic sorbents

Abstract

The prospects of increasing of environmental safety level for industrial enterprises as a result of the use of the modern ferromagnetic sorbents for the purification of rinsing wastewater from heavy metal compounds are considered. The structure of the obtained powder sorbents was studied by the granulometric method and X-ray phase analysis. A laboratory setup was developed to study of influence of sorption parameters on extraction degree of toxic substances from wastewater. The sorption properties of powders obtained by co-precipitation of polyvalent ferrum compounds, electroerosion dispersion of steel shavings and iron ore flotation concentrate are compared. Effect of ultrasonic treatment of coprecipitation reaction mixture and the speed of mixing of the sorption mixture on the quality of wastewater treatment from zinc ions was studied. The best results of sorption water purification were achieved with use of freshly obtained pasty suspension of ferritization coprecipitation at a stirring speed of the sorption mixture of 1200 rpm. It was found, that under such conditions a high degree of extraction of Zn2+ ions ̶ 98 % is ensured, and the resulting purified solution meets the standards for the content of zinc ions in water for its reuse in the rinsing operations at electroplating facilities. The use of research results at industrial enterprises will prevent environmental pollution by toxic heavy metals, replace inefficient technologies, and ensure rational use of water and raw materials in the industrial productions.