Separation and recovery of potassium chloride from sinter dust of a steel plant

Abstract

Many companies return sinter dust to sintering directly, resulting in circulation and accumulation of harmful elements, which will affect the collection efficiency, sinter quality, and the grade of blast furnace seriously. A new separation and recovery process of potassium from the dust was proposed, which included water leaching, solid liquid separation, purification, vacuum evaporation and cooling crystallisation. The results showed that the optimum conditions were as follows: the ratio of solid to liquid = 1:3, leaching time = 40 min, and leaching temperature = 80°C, leaching rate of potassium chloride reaches 99.99%. When solution weight loss is 97.5%, the evaporation of potassium chloride product reaches 97.96%, purity of potassium chloride in the crystal can be 75.15%. Based on experiment results, a mathematical model of leaching kinetic of potassium chloride including stirring temperature and leaching ratio is proposed.

Get full access to this article

View all access options for this article.

References

China actively crack the shortage of potash mineral resources puzzle. J Salt Lake Res. 2007;15:6.

Zhao

Study on the rational utilization of iron and dust in iron and steel plant. J Northeastern Univ. 1988;9:5.

Lanzerstorfer

Steiner

Characterization of sintering dust collected in the various fields of the electrostatic precipitator. Environ Technol. 2016;37:1559–1567. doi: 10.1080/09593330.2015.1120787

Chlorinated sintering removal of alkali metal experimental study. Sintering Pelleting. 1983;6:8.

Zhang

Guo

et al. Circulation and Enrichment cycle of alkali metal in blast furnace. J Iron Steel Res. 2008;2008:4.

Keegel

Jr . Methods for recycling electric arc furnace dust, in: U.S.p.N. 5013532 (Ed.), USA Patent, USA, 1996.

Tsai

J-H

Lin

K-H

Chen

C-Y.

Chemical constituents in particulate emissions from an integrated iron and steel facility. Journal of Hazard Mater. 2007;147:111–119. doi: 10.1016/j.jhazmat.2006.12.054

Lanzerstorfer

Characterization of dust from blast furnace cast house de-dusting. Environ Technol. 2016;37:1–7. doi: 10.1080/09593330.2015.1120787

Chen

Wang

Zhou

et al. Kinetics of evaporation of Zn and Pb from carbon-bearing pellets made of dust containing Zn-Pb-Fe oxides. J Univ Sci Technol Beijing. 2000;7:178–183.

10.

Das

Prakash

Reddy

et al. An overview of utilization of slag and sludge from steel industries. Res Conserv Recycl. 2007;50:40–57. doi: 10.1016/j.resconrec.2006.05.008

11.

Menad

Tayibi

Carcedo

et al. Minimization methods for emissions generated from sinter strands: a review. J Clean Prod. 2006;14:740–747. doi: 10.1016/j.jclepro.2004.03.005

12.

Zhang

et al. Recovery of potassium chloride from sintering EAF dust. Chin J Process Eng. 2014;14:5.

13.

Jin

Zhang

Zang

Study on method of removing potassium from Masteel high potassium sintering dust. Sintering Pelleting. 2013;38:4.

14.

Zhang

Peng

Guo

Recovery of potassium chloride from sintered dust of ironmaking works. Environ Eng. 2009;27:4.

15.

Liu

Jiang

Yang

et al. Removal of potassium and preparation of potassium sulfate from sintering EAF dust. Metal Mater Metall Eng. 2011;39:7.

16.

Qian

Hou

et al. Recycling of the electric dust in sintering machine head. Iron Steel. 2015;50:5.

17.

Cui

Guo

Z-C

Zhang

F-L.

Existing state of potassium chloride in agglomerated sintering dust and its water leaching kinetics. T Nonferr Metal Soc China. 2011;21:1847–1854. doi: 10.1016/S1003-6326(11)60940-0

18.

Lanzerstorfer

Mechanical properties of dust collected by dust separators in iron ore sinter plants. Environ Technol. 2015;36:3186–3193. doi: 10.1080/09593330.2015.1055821

19.

Lanzerstorfer

Mechanical properties of dusts collected from blast furnace dust catchers and cast house dedusting filters. Particul Sci Technol. 2016;34:366–372. doi: 10.1080/02726351.2015.1089347

20.

Peng

Guo

Zhang

Existing state of potassium chloride in agglomerated sintering dust and its water leaching kinetics. T Nonferr Met Soc China. 2011;21:8.

21.

Katsuno

Yoshinaga

Kitade

et al. Crystallization kinetics of polypropylene containing a sorbitol nucleating agent. Polymer J. 2013;45:87–93. doi: 10.1038/pj.2012.199

22.

Masoumi

Shahriari

Jahazi

et al. Kinetics and mechanisms of γ′ reprecipitation in a Ni-based superalloy. Scientific Reports. 2016;6.