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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)07-2762-08
同步还原焙烧法降低循环流化床固硫粉煤灰 三氧化硫并回收铁精矿实验
刘汇东1,代世峰2,孙继华1,夹少辉1,张松峰1

(1. 中国矿业大学(北京) 地球科学与测绘工程学院,北京,100083;
2. 中国矿业大学(北京) 煤炭资源与安全开采国家重点实验室,北京,100083
)

摘 要: 以重庆安稳电厂高烧失量、高SO3和铁质量分数的循环流化床固硫粉煤灰为例,运用同步还原焙烧—湿法弱磁选铁精矿方法对粉煤灰进行协同降硫和选铁实验:以粉煤灰中未燃尽碳作还原剂而无须额外添加,在一次还原焙烧工序中同步实现了粉煤灰中SO3载体矿物无水石膏(CaSO4)的分解以及赤铁矿(Fe2O3)的磁化;采用水淬法冷却,湿法弱磁选铁精矿,在水淬和湿法磁选阶段CaSO4分解产物CaS水化生成粉煤灰的有益组分Ca(OH)2;另一水化产物H2S气体亦予以回收利用。研究结果表明:循环流化床固硫粉煤灰经900 ℃下还原焙烧15 min,再经水淬快速冷却、湿法弱磁选铁精矿,可获得总铁回收率49.8%、品位52.9%的铁精矿;处理后的粉煤灰烧失量和SO3质量分数分别降至5.3%和1.32%,达到GB/T 1596—2005“用于水泥和混凝土中的粉煤灰”中的相应指标。

 

关键词: 安稳电厂;循环流化床;固硫粉煤灰;同步还原;磁化焙烧;三氧化硫

Synchronous reduction roasting experiments for lessening of SO3 and iron recycling from circulating fluidized bed fly ash
LIU Huidong1, DAI Shifeng2, SUN Jihua1, JIA Shaohui1, ZHANG Songfeng1

1. College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing),
Beijing 100083, China;
2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing),
Beijing 100083, China

Abstract:The Anwen plant in Chongqing of China is characterized by high contents of loss on ignition (LOI), SO3 and iron. Experiments for recycling iron and reducing contents of SO3 and LOI in CFB desulfurization fly ash were carried out on the Anwen fly ash. A synchronous reduction roasting process was performed, with the unburned carbon in fly ash as the deoxidizer, followed by a wet magnetic separation. In only once reduction roasting process, the magnetization of hematite and the decomposition of anhydrite (CaSO4), sulfur trioxide’s carrier mineral, were completed simultaneously. During the procedures of water quenching cooling and wet magnetic separation, CaS, one of the decomposition products of CaSO4 was transformed to Ca(OH)2 by hydration; another decomposition product H2S was recovered and utilized. The results show that reductive roasting of the fly ash at 900 ℃ for 15 min, followed by recycling of iron using wet weak magnetic separator, an iron recovery rate of 52.9% and a concentrate grade of 49.8% are achieved. Meanwhile, the LOI and SO3 contents of the fly ash decrease to 5.3% and 1.32%, respectively. Thus, the treated fly ash satisfies the standard in GB/T 1596—2005 about fly ash used for cement and concrete production.

 

Key words: Anwen plant; circulating fluidized bed; desulfurization fly ash; synchronous reduction; magnetizing roast; sulfur trioxide

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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