李然^1,,
潘洁¹,
朱晓敏¹,
柏少军²
1.昆明冶金高等专科学校环境工程学院，昆明 650033
2.昆明理工大学国土资源工程学院，昆明 650093

Iron-increase and impurity-removal for pyrite cinder with high content of arsenic by acid leaching-deep reduction-magnetic separation processing

LI Ran^1,,
PAN Jie¹,
ZHU Xiaomin¹,
BAI Shaojun²
1.Faculty of Environmental Engineering, Kunming Metallurgy College, Kunming 650033, China
2.Faculty of Land Resources Engineering, Kunming University of Science & Technology, Kunming 650093, China

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摘要:对云南某高砷烧渣进行了酸浸-深度还原-磁选实验研究，采用HSC、SEM-EDS、XRD等检测技术分析了提铁脱杂的机理。研究结果表明，原料中Fe品位为 57.35%，含As高达2.78%，As主要以金属砷酸盐形式赋存，Cu和Zn的品位分别为0.52%和0.57%。在浸出温度60 °C，硫酸质量分数25%的条件下，浸出作业As脱除率为86.43%。浸出渣碳热深度还原最佳实验条件为：还原温度1 050 °C，还原时间120 min，煤粉质量分数30% ，砷的作业挥发率78.23%。焙烧样品经磁选后，最终获得铁品位71.19%，总回收率约92%，含As 0.08%, 含Cu 0.29%，含Zn 0.10%的铁精矿。基础理论分析及样品特性研究结果表明，酸浸促使难溶性金属砷酸盐中As转变为易溶性的H3AsO4，碳热深度还原实现了氧化铁矿物向金属铁相的转变以及As的进一步脱除。研究为类似硫酸烧渣的综合利用提供了一定的理论基础和技术支撑。
关键词: 高砷烧渣/
酸浸/
深度还原/
磁选/
综合利用

Abstract:The processing consisted of acid leaching-deep reduction-magnetic separation was employed for the iron-increase and impurity-removal of pyrite cinder with high content of arsenic. Additional, the mechanism of iron upgrading and impurity removal was investigated by HSC, SEM-EDS and XRD analysis technologies. The results indicated that the raw material contained TFe 57.35%, As 2.78%, Cu 0.52% and Zn 0.57%. The harmful element of arsenic was mainly in the form of metal-arsenate. The arsenic removal rate was 86.43% after the treatment of acid leaching with a leaching temperature of 60 °C and a sulfuric acid mass fraction of 25%. After the treatment of deep carbothermic reduction under the optimum experimental conditions (reduction temperature of 1 050 °C, reduction time of 120 min and pulverized mass fraction of 30%), the arsenic volatility rate reached 78.23%. Then, the reduction samples were conducted by magnetic separation processing. Finally, a qualified iron concentrate with TFe 71.19% and about 92% of iron recovery was obtained, in which the contents of arsenic, copper and zinc were 0.08%, 0.29% and 0.10%, respectively. The results of theoretical analysis and samples characteristic showed that the insolubility metal-arsenates were transformed into solubility arsenic acid during the acid leaching processing, resulting in the removal of arsenic. Meanwhile, the iron oxide minerals were transformed into metallic iron phase during the deep carbothermic reduction processing. Thus, the present paper could provide a theoretical basis and technical support for the comprehensive utilization of similar pyrite cinders.
Key words:pyrite cinder with high content of arsenic/
acid leaching/
deep carbothermic reduction/
magnetic separation/
comprehensive utilization.

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刊出日期:2018-09-20

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高砷烧渣酸浸-深度还原-磁选提铁除杂

李然^1,,
潘洁¹,
朱晓敏¹,
柏少军²
1.昆明冶金高等专科学校环境工程学院，昆明 650033
2.昆明理工大学国土资源工程学院，昆明 650093
基金项目:
关键词: 高砷烧渣/
酸浸/
深度还原/
磁选/
综合利用
摘要:对云南某高砷烧渣进行了酸浸-深度还原-磁选实验研究，采用HSC、SEM-EDS、XRD等检测技术分析了提铁脱杂的机理。研究结果表明，原料中Fe品位为 57.35%，含As高达2.78%，As主要以金属砷酸盐形式赋存，Cu和Zn的品位分别为0.52%和0.57%。在浸出温度60 °C，硫酸质量分数25%的条件下，浸出作业As脱除率为86.43%。浸出渣碳热深度还原最佳实验条件为：还原温度1 050 °C，还原时间120 min，煤粉质量分数30% ，砷的作业挥发率78.23%。焙烧样品经磁选后，最终获得铁品位71.19%，总回收率约92%，含As 0.08%, 含Cu 0.29%，含Zn 0.10%的铁精矿。基础理论分析及样品特性研究结果表明，酸浸促使难溶性金属砷酸盐中As转变为易溶性的H3AsO4，碳热深度还原实现了氧化铁矿物向金属铁相的转变以及As的进一步脱除。研究为类似硫酸烧渣的综合利用提供了一定的理论基础和技术支撑。

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