Ultrasonically assisted acid extraction of manganese from slag.
An ultrasonically assisted extraction (UAE) technique was developed for the extraction of manganese from electrolytic manganese slag using a sulfuric acid-hydrochloric acid mixture (4:0.3, v/v) as solvent. The UAE conditions were optimized and the significance of variables affecting UAE tested. The determination of manganese was carried out by atomic absorption spectrophotometry (AAS). The ultrasonic extraction efficiency of manganese can reach about 90% under the following optimum conditions: solvent-slag ratio: 4 mL/g; temperature: 333 K; particle size: 0.2 mm; extraction time: 35 min; amount of additive (citric acid): 8 mg/g slag. During the UAE process, the particle size parameter on the extraction was the most significant, followed by solvent-slag ratio, citric acid mass, time and temperature. The repeatability of UAE technique was satisfactory. The ultrasonic method shown to be a much superior approach to the conventional extraction method in the extraction of manganese from slag.
Li
Hui
H
Hunan Province Key Laboratory of Forest Products and Chemical Industry Engineering, Jishou University, Hunan Zhangjiajie 427000, PR China. Electronic address: lihuijsdx@163.com.
Zhang
Zhaohui
Z
Hunan Province Key Laboratory of Forest Products and Chemical Industry Engineering, Jishou University, Hunan Zhangjiajie 427000, PR China.
Tang
Siping
S
Department of Chemistry and Material Science, Hengyang Normal University, Hunan Hengyang 421000, PR China.
Li
Yanan
Y
Hunan Province Key Laboratory of Forest Products and Chemical Industry Engineering, Jishou University, Hunan Zhangjiajie 427000, PR China.
Zhang
Yongkang
Y
Hunan Province Key Laboratory of Forest Products and Chemical Industry Engineering, Jishou University, Hunan Zhangjiajie 427000, PR China.
D019343:Citric Acid / Q000737:chemistry; D007202:Indicators and Reagents; D007220:Industrial Waste; D008345:Manganese / Q000302:isolation & purification* / Q000528:radiation effects*; D010316:Particle Size; D015203:Reproducibility of Results; D012996:Solutions; D013054:Spectrophotometry, Atomic; D013464:Sulfuric Acids / Q000737:chemistry; D013696:Temperature; D014465:Ultrasonics
D007202:Indicators and Reagents; D007220:Industrial Waste; D012996:Solutions; D013464:Sulfuric Acids; D019343:Citric Acid; D008345:Manganese; C033158:sulfuric acid