安徽铜陵铜尾矿硫形态及硫同位素分布特征

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Abstract

In this study, the composition and distribution characteristics of physiochemical proxies, sulfur species and sulfur isotope of sulfate in S and SP profiles collected from a copper tailing of Shuimuchong were analyzed and discussed. The results showed that profiles of S and SP were general acidic, with a pH value of 2.59~6.12 and 3.50~6.27, respectively. The oxidation-reduction potential (Eh) of S and SP increased obviously from the bottom up, with an Eh value of 66~457mV and -37~307mV, respectively. The content of acid volatile sulfur (AVS) in S and SP profiles was 0~62.36mg/g and 0~3.44mg/g; while the pyrite sulfur (CRS) was 0.70~32.30mg/g and 0.17~5.39mg/g, respectively. The content of AVS and CRS in these two profiles showed a similar decrease trend from the bottom up, and AVS was oxidized earlier than CRS. The content of elemental sulfur (ES) in S and SP profiles was 0~8.83mg/g and 0~3.62mg/g, without clear trend in depths. The content of sulfate was 8.44~66.34mg/g and 8.48~29.87mg/g, respectively; they decreased from bottom-up in these two profiles. The hardpan (iron hydroxide) at 11.5~16.5cm and 18~54cm in S and SP blocked the transport of oxygen and water from the top down, slowed the oxidation of sulfide in down layers, and formed a sulfate-rich zone. The total sulfur (TS) of these two profiles was 9.18~109.69mg/g and 12.38~37.72mg/g, respectively, and the lower values in up layers were likely due to the surface leaching. Generally, the content of TS and sulfur species in SP profile was lower than those in S, suggested more intense leaching. The δ³⁴S of sulfate in S and SP was -3.32‰~13.43‰ and -3.08‰ ~1.80‰, respectively. An exceptional δ³⁴S of 13.43‰ in S-9layer suggested a source of anhydrite, while others indicated a source of sulfide.

Key words： acid mine drainage copper tailing oxidation zone sulfur species sulfur isotope

Received: 14 August 2018

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X758

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	Articles by authors
	WANG Xiao-fang
	LI Fang-xiao
	HUANG Tao
	SUN Qing-ye

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WANG Xiao-fang,LI Fang-xiao,HUANG Tao等. Distribution characteristics of sulfur species and isotopes in a copper tailing at Tongling, Anhui Province[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(4): 1664-1671.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I4/1664

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