张瑞昌^1,,
邱会玲¹,
王婷¹,
冯帆¹,
李梦婷¹
1.河南科技大学化工与制药学院，洛阳 471023
基金项目: 国家自然科学基金资助项目 41601520
河南科技大学大学生研究训练计划(SRTP)项目 2018140 国家自然科学基金资助项目(41601520)
河南科技大学大学生研究训练计划(SRTP)项目(2018140)

Recovery of Cu and Zn from waste incineration fly ash through integrated sulfur bio-oxidation and bio-reduction

ZHANG Ruichang^1,,
QIU Huiling¹,
WANG Ting¹,
FENG Fan¹,
LI Mengting¹
1.School of Chemical Engineering & Pharmacy, Henan University of Science and Technology, Luoyang 471023, China

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摘要:利用正交实验确定了飞灰中重金属生物淋滤浸出的最佳条件：pH 4.0、飞灰固体浓度1%和硫粉添加量5 g·L-1。在此条件下，飞灰中Cu、Zn、Pb和Cd的去除率分别为47.3%、72.9%、12.4%和75.8%。通过氮气吹脱硫酸盐生物还原产生的H2S，在pH为2.2和4.0时可分别以硫化物沉淀形式选择回收生物淋滤产生的淋滤液中的Cu和Zn。X射线能谱分析发现，沉淀得到的铜和锌纯度分别达90.6%和99.9%。X射线衍射分析铜沉淀的晶体类型主要为靛铜矿(CuS)、蓝辉铜矿(Cu7S4)和雅硫铜矿(Cu9S8)；锌沉淀主要为纤维锌矿(ZnS)。综合分析，微生物硫氧化-硫还原可以以纯净硫化物形式回收飞灰中47.3%的Cu和64.0%的Zn。
关键词: 垃圾焚烧飞灰/
生物淋滤/
硫酸盐还原/
重金属回收

Abstract:In this study, the optimum conditions for heavy metal bioleaching from waste incineration fly ash, being determined through the orthogonal test, were following: pH 4.0, fly ash solid concentration of 1% and sulfur concentration of 5 g·L-1. Under these conditions, the removal rates of Cu, Zn, Pb and Cd in fly ash were 47.3%, 72.9%, 12.4% and 75.8%, respectively. For H2S produced from the bio-reduction of N2 stripped sulfate, it could be used to selectively recover Cu and Zn in the leachate through forming sulfide precipitation at pH 2.2 and 4.0, respectively. The X-ray energy spectrum (EDS) analysis indicated that the purity of copper or zinc in its own precipitate was 90.6% and 99.9%, respectively. XRD analysis confirmed that copper precipitate consisted of covelline (CuS), anilite (Cu7S4) and yarrowite (Cu9S8), and zinc precipitate primarily consisted of wurtzite (ZnS). Ultimately, 47.3% of Cu and 64.0% of Zn in the fly ash could be recovered as pure sulfides through the integrated sulfur bio-oxidation and bio-reduction.
Key words:waste incineration fly ash/
bioleaching/
sulfate reduction/
heavy metals recovery.

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微生物硫氧化-硫还原回收垃圾焚烧飞灰中Cu和Zn

张瑞昌^1,,
邱会玲¹,
王婷¹,
冯帆¹,
李梦婷¹
1.河南科技大学化工与制药学院，洛阳 471023
基金项目: 国家自然科学基金资助项目 41601520 河南科技大学大学生研究训练计划(SRTP)项目 2018140 国家自然科学基金资助项目(41601520) 河南科技大学大学生研究训练计划(SRTP)项目(2018140)
关键词: 垃圾焚烧飞灰/
生物淋滤/
硫酸盐还原/
重金属回收
摘要:利用正交实验确定了飞灰中重金属生物淋滤浸出的最佳条件：pH 4.0、飞灰固体浓度1%和硫粉添加量5 g·L-1。在此条件下，飞灰中Cu、Zn、Pb和Cd的去除率分别为47.3%、72.9%、12.4%和75.8%。通过氮气吹脱硫酸盐生物还原产生的H2S，在pH为2.2和4.0时可分别以硫化物沉淀形式选择回收生物淋滤产生的淋滤液中的Cu和Zn。X射线能谱分析发现，沉淀得到的铜和锌纯度分别达90.6%和99.9%。X射线衍射分析铜沉淀的晶体类型主要为靛铜矿(CuS)、蓝辉铜矿(Cu7S4)和雅硫铜矿(Cu9S8)；锌沉淀主要为纤维锌矿(ZnS)。综合分析，微生物硫氧化-硫还原可以以纯净硫化物形式回收飞灰中47.3%的Cu和64.0%的Zn。

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