LIU Ling¹，LIU Haiqing¹，HAN Liang², LI Xilin¹，ZHAO Kui³，XU Hui³

（1.College of Architecture and Engineering, Liaoning Technical University, Fuxin 123000, China；
2. Hydrographical Bureau of Fuxin, Fuxin123000, China；
3. Anshan Iron and Steel group corporation,Anshan114021, Liaoning, China)

 

Abstract: In order to comprehensively and systematically study the Cr(VI) and Cr(III) release characteristics in chromium slag, taking the chromium slag from Shenyang and Jinzhou as an object, basing on dynamic leaching experiment, the mass concentration of Cr(VI) and total chromium were measured, and Cr(VI) and Cr(III) dissolution and releasing regularity in the chromium slag leachate were analyzed. Results show that the concentration of Cr(VI) and total chromium decline rapidly at first and then decrease slowly in the leaching process of both the new chromium slag from Jinzhou and the old chromium slag from Shenyang. Compared with the new chromium slag from Jinzhou, Cr(VI) and total chromium concentration of the old chromium slag from Shenyang decrease slowly with decreasing initial concentration. Compared with Cr(VI), the dissolution concentration of Cr(III) is less from the two chromium slags, and the Cr(III) dissolution ratio presents a rising trend of volatility. The leaching concentration of Cr(VI) and total chromium are double exponential curve relationship and the power function curve relationship respectively with the leaching solution volume for the new chromium slag from Jinzhou and the old chromium residue from Shenyang. The experimental results will provide scientific theoretical basis for groundwater pollution.

 

Key words: chromium slag; dynamic leaching; dissolution; releasing; groundwater pollution；trivalent chromium；total chromium

 

EARTH AND ENVIRONMENT Vol.44, No.5 Tot No.313, 2016, Page 581-585