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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第7期    总第251期    2015年7月

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文章编号:1672-7207(2015)07-2419-07
锰渣的理化特性及煅烧特性
闫国孟1,彭兵1,柴立元1, 2,闵小波1, 2,彭宁1,雷杰1,刘琴1,张强1,胡明1

(1. 中南大学 冶金与环境学院,湖南 长沙,410083;
2. 国家重金属污染防治工程技术研究中心,湖南 长沙,410083
)

摘 要: 分析“两矿一步法”电解MnO2酸浸中和压滤渣(简称锰渣)的理化特性,采用热重-差热分析法(TG-DTA)和X线衍射分析(XRD)确定不同温度下物相转变行为以及锰渣中锰的浸出随煅烧温度的变化。研究结果表明:锰渣为第Ⅱ类一般工业固体废物,以石英、水化硫酸钙、针铁矿和铁、铝矾矿相为主,矿相颗粒细、结晶度低。随着煅烧温度的升高,硫酸钙、针铁矿,以及铁、铝矾逐步脱水、分解,形成无水石膏、赤铁矿等,超过900 ℃时锰渣明显熔融、烧结,部分金属与硅反应形成玻璃态硅酸盐;锰渣中总锰质量分数约5%,约3%以MnSO4的形式存在。锰渣锰的浸出毒性根据煅烧温度分为3类,即低温可浸出(<300 ℃,锰离子质量浓度为0.6~1.0 g/L),中温易浸出(400~700 ℃,锰离子质量浓度为2~3 g/L);高温难浸出(>800 ℃,锰离子质量浓度为<0.01 g/L)。

 

关键词: 锰渣;煅烧;相变行为;浸出毒性

Physicochemical and calcination characteristics of manganese residue
YAN Guomeng1, PENG Bing1, 2, CHAI Liyuan1, 2, MIN Xiaobo1, 2, PENG Ning1, LEI Jie1, LIU Qin1, ZHANG Qiang1, HU Ming1

1. School of Metallurgy & Environment, Central South University, Changsha 410083, China;
2. Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution,
Changsha 410083, China

Abstract:The physicochemical characteristics of manganese residue from two ore one-step process were analyzed. The thermal phase transition behavior was detected by using TG-DTA and XRD. And manganese leaching toxicity was determined. The results show that manganese residues which belongs to general industrial solid waste in small particles contain quartz, hydrated calcium sulfate, goethite, jarosite and hydrobasaluminite. The calcium sulfate, goethite, jarosite and hydrobasaluminite are dehydrated at high temperature and decomposed to form anhydrite and hematite. Manganese residues sinter and melt obviously and silicate glass appears through reaction between some metals and silicon when the temperature is over 900 ℃. There is about 5% of Mn present in the residue and 3% of it is MnSO4. Manganese leaching toxicity appeared in three stages according to calcination temperature, that is, low-temperature stage (below 300 ℃, mass concentration of manganese ion is 0.6-1.0 g/L), middle-temperature stage (between 400 ℃ to 700 ℃, mass concentration of manganese ion is 2-3 g/L), and high-temperature stage (above 800 ℃, mass concentration of manganese ion is less than 0.01 g/L).

 

Key words: manganese residue; calcination; phase transition behavior; leaching toxicity

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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