Title: Resource treatment of HPF coking desulphurisation waste solution: composition and characteristics of pyrolysis

Authors: Guoqiang Li; Yongfa Zhang; Zhenzhen Li; Yuliang Shi; Yazhen Wang; Xianglan Li

Addresses: Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, No. 79 West Yingze Street, 030024, Taiyuan, China ' Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, No. 79 West Yingze Street, 030024, Taiyuan, China ' Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, No. 79 West Yingze Street, 030024, Taiyuan, China ' Dacheng Engineering CO. LTD. of Taiyuan University of Technology, Taiyuan 030024, China ' Dacheng Engineering CO. LTD. of Taiyuan University of Technology, Taiyuan 030024, China ' Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, No. 79 West Yingze Street, 030024, Taiyuan, China

Abstract: HPF (H: hydroquinone; P: dinuclear cobalt-phthalocyanine sulfonate; F: ferrous sulphate) coking desulphurisation waste solution (CDWS) produced from coking oven gas desulphurisation process is an extremely harmful pollutant. The fundamental natures of this solution, which involves its main ingredient and content, type of organic matter, thermal decomposition characteristics of salt, and relationship of boiling point and density with salt content, were examined in this paper. Results show that inorganic salts in CDWS mainly contain ammonium thiosulfate and ammonium thiocyanate; the content and ratio of this two differ with factories and batches of CDWS. Organic matters in CDWS mainly contain phenolic and nitrogenous organic compounds, which together account for 98.79% of the total organic matter. The salts in CDWS are of poor thermal stability and can be decomposed at 425°C. The density and boiling point of CDWS increase with increasing salt content. Heating temperature should be strictly controlled, and solution flow should be supplemented by stirring at vacuum conditions during concentration and drying. [Received: March 15, 2013; Accepted: December 16, 2013]

Keywords: HPF CDWS; coking desulphurisation waste solution; ammonium thiocyanate; ammonium thiosulfate; gas chromatography; mass spectrometry; thermo-gravimetric analysis; waste treatment; pyrolysis; coking oven gas desulphurisation; hydroquinone; dinuclear cobalt-phthalocyanine sulfonate; ferrous sulphate; inorganic salts; organic matter; temperature control; environmental pollution.

DOI: 10.1504/IJOGCT.2014.064851

International Journal of Oil, Gas and Coal Technology, 2014 Vol.8 No.2, pp.182 - 193

Received: 26 Mar 2013
Accepted: 16 Dec 2013
Published online: 30 Sep 2014 *

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