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Citation: 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. doi: 10.11944/j.issn.1000-0518.2015.10.150012 shu

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

1.
a Institute 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;
2.
b College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Corresponding author: HUANG Yudai,
Received Date: 12 January 2015
Available Online: 30 April 2015
Fund Project: 新世纪优秀人才计划(NCET-12-1076) (NCET-12-1076)国家自然科学基金(21161021,21466036) (21161021,21466036)

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.
- white ash,
- speciation determination,
- XPS,
- acid leaching,
- arsenic removal
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