Determination of Speciation in White Ash and Acid Leaching Arsenic Removal Technique

doi:10.11944/j.issn.1000-0518.2015.10.150012

Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (10): 1208-1214.DOI: 10.11944/j.issn.1000-0518.2015.10.150012

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Determination of Speciation in White Ash and Acid Leaching Arsenic Removal Technique

MA Miao^a,HUANG Yudai^a^*(),GUO Yong^a,JIA Dianzeng^a,TANG Xincun^a^b,WANG Xingchao^a,PAN Yanliang^a

^aInstitute of Applied Chemistry,Key Laboratory of Material and Technology for Clean Energy,Ministry of Education,Key Laboratoy of Avanced Functional Materials, Xinjiang University,Urumqi 830046,China
^bCollege of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China

Received:2015-01-12 Accepted:2015-06-05 Published:2015-10-10 Online:2015-10-10
Contact: HUANG Yudai
Supported by:
Supported by New Century Excellent Talents Scheme(No.NCET-12-1076), the National Natural Science Foundation of China(No.21161021, No.21466036)

Abstract

Abstract:

White ash safety storage is a serious problem because it contains toxic arsenic compounds. The phase analysis of white ash will provide some important information for how to handle these ashes and make it satisfy environment requirement. X-ray photoelectron spectroscopy(XPS) provides information on the chemical state of elements in bulk samples and single minerals, as well as the qualitative and quantitative determination of the surface or reaction layers(less than 10 nm thick) of minerals and grains. In this paper, to determine the chemical states and content of various elements, the phase composition and chemical states in white ash of an enterprise in He'nan province were studied by XPS and X-ray diffraction(XRD). The results indicate that the relative content of As runs up to 20.99%, in which 11% is As(Ⅲ), and the rest is As(Ⅴ). In addition, the sample contains small amounts of Cu, Pb, Zn and their oxides. Based on the composition of the sample, a novel acid leaching method by hydrogen peroxide selective oxidation was proposed for removing arsenic. The method can make As(Ⅲ) convert to As(Ⅴ) with low toxicity and improve arsenic leaching ratio. The ratio can runs up to 97.1% in the best leaching process.

Key words: white ash, speciation determination, XPS, acid leaching, arsenic removal

MA Miao,HUANG Yudai,GUO Yong,JIA Dianzeng,TANG Xincun,WANG Xingchao,PAN Yanliang. Determination of Speciation in White Ash and Acid Leaching Arsenic Removal Technique[J]. Chinese Journal of Applied Chemistry, 2015, 32(10): 1208-1214.

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Determination of Speciation in White Ash and Acid Leaching Arsenic Removal Technique

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