Purification of coal fly ash leach liquor by solvent extraction: Identification of influential factors using Design of Experiments

Q1 Earth and Planetary Sciences

International Journal of Mineral Processing Pub Date : 2017-07-10 DOI:10.1016/j.minpro.2017.05.004

M.J. Rushwaya , S. Ndlovu

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引用次数: 7

Abstract

The solvent extraction of iron and titanium from coal fly ash leach solution was investigated by the use of Design of Experiments. The effect of the factors: hydrogen ion concentration, Primene JMT concentration, aqueous to organic volume phase ratio and temperature on iron and titanium extraction were evaluated. A two level factorial design implemented by statistical software Design Expert® 6, determined the significant factors and any associated interactive effects amongst these factors.

Hydrogen ion concentration and the interaction between the aqueous to organic volume phase ratio with Primene JMT concentration had a significant effect on the extraction of iron while temperature did not. Hydrogen ion concentration and temperature did not have a significant effect on the extraction of titanium, while the interaction between Primene JMT concentration and the aqueous to organic volume phase ratio had a significant effect.

The maximum iron extraction achieved in the implemented design was 33.8% while 99% of titanium could be extracted from the coal fly ash leach solution. Extraction improvement tests showed that at a hydrogen ion concentration of 0.28 M, 88% iron and 99% titanium extraction from coal-fly ash leach solution could be achieved.

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溶剂萃取净化粉煤灰浸出液:用实验设计确定影响因素

采用实验设计法对煤飞灰浸出液中铁和钛的溶剂萃取进行了研究。考察了氢离子浓度、Primene JMT浓度、水有机体积比和温度等因素对铁钛萃取的影响。由统计软件design Expert®6实施的两水平析因设计确定了重要因素和这些因素之间的任何相关交互效应。氢离子浓度和水有机体积比与Primene JMT浓度的相互作用对铁的萃取有显著影响，而温度对铁的萃取没有显著影响。氢离子浓度和温度对钛的萃取没有显著影响，而prime JMT浓度和水有机体积相比的相互作用对钛的萃取有显著影响。在设计中，铁的最大提取率为33.8%，钛的最高提取率为99%。萃取改进试验表明，在氢离子浓度为0.28 M时，粉煤灰浸出液中铁和钛的提取率可达88%和99%。

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来源期刊

International Journal of Mineral Processing 工程技术-工程：化工

CiteScore

3.02

自引率

0.00%

发文量

审稿时长

11.1 months

期刊介绍： International Journal of Mineral Processing has been discontinued as of the end of 2017, due to the merger with Minerals Engineering. The International Journal of Mineral Processing covers aspects of the processing of mineral resources such as: Metallic and non-metallic ores, coals, and secondary resources. Topics dealt with include: Geometallurgy, comminution, sizing, classification (in air and water), gravity concentration, flotation, electric and magnetic separation, thickening, filtering, drying, and (bio)hydrometallurgy (when applied to low-grade raw materials), control and automation, waste treatment and disposal. In addition to research papers, the journal publishes review articles, technical notes, and letters to the editor..