Add time:08/18/2019         Source:sciencedirect.com

Respirable sintering dust was an abundant and hazardous waste arrested by electrostatic precipitators from iron and steel industry. In this study, this waste was first found to contain 0.3% Rb, existing in the form of chloride and making it a promising Rb extracting material. Meanwhile, 95.24% of Rb and 93.43% of K in it can be easily recovered by water leaching (S/L = 1:5), resulting in a solution of 740 mg/L Rb and 33.85 g/L K. Then this leachate was extracted with 4-tert-butyl-2-(α-methylbenzyl) phenol (t-BAMBP) in sulphonated kerosene to separate Rb from K after purification. The optimized solvent extraction conditions were 1.0 mol/L t-BAMBP, phase ratio of 3:1, 1.2 mol/L alkalinity in aqueous. Moreover, the organic phase was treated with deionized water (O/A = 5:1) for scrubbing and 1.2 mol/L HCl (O/A = 5:1) for stripping. Under optimal conditions, a single Rb extraction and back-extraction efficiencies were 91.80% and 89.93%, respectively. Finally, a RbCl with 99.5% purity and a total Rb extraction rate of 58.26% were achieved by a multistage continuous countercurrent extraction. These results did not only indicate that respirable sintering dust is a new tremendous potential Rb source but also provide a promising way to utilize Rb from this dust.

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