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Investigation of the redox performance of Pyrite cinder calcined at different temperature in chemical looping combustion

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Chinese Journal of Chemical Engineering 2022年第8期35卷 98-105页

作者： Zhong Ma Guofu Liu Hui Zhang Yonggang Lu School of Energy&Power Engineering Jiangsu UniversityZhenjiang 212013China State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021China School of Energy and Power Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China

As an industrial solid waste,Pyrite cinder exhibited excellent reactivity and cycle stability in chemical looping combustion.Prior to the experiment,oxygen carriers often experienced a high temperature calcination process to stabilize the physico-chemical properties,which presented significant influence on the redox performance of oxygen carriers.However,the effect of calcination temperature on the cyclic reaction performance of Pyrite cinder has not been studied in detail.In this work,the effect of calcination temperature on the redox activity and attrition characteristic of Pyrite cinder were studied in a fluidizedbed reactor using CH_(4) as fuel.A series of Pyrite cinder samples were prepared by controlling the calcination temperature.The redox activity and attrition rate of the obtained Pyrite cinder samples were investigated deeply.The results showed that calcination temperature displayed significant impact on the redox performance of Pyrite cinder.Considering CH_(4) conversion(80%–85%)and attrition resistance,the Pyrite cinder calcined at 1050℃ presented excellent redox properties.In the whole experiment process,the CO_(2) selectivity of the Pyrite cinder samples were not affected by the calcination temperature and were still close to 100%.The results can provide reference for optimizing the calcination temperature of Pyrite cinder during chemical looping process.

关键词： Chemical looping combustion Pyrite cinder Calcination temperature CO_(2)capture Attrition Waste treatment

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Effect of supports on the redox performance of Pyrite cinder in chemical looping combustion

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Chinese Journal of Chemical Engineering 2021年第9期34卷 168-174页

作者： Zhong Ma Chuan Yuan Shuai Zhang Yonggang Lu Junhui Xiong School of Energy&Power Engineering Jiangsu UniversityZhenjiang 212013China State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China

Chemical looping combustion(CLC)is a clean and efficient flame-free combustion technology,which combust the fuels by lattice oxygen from a solid oxygen carrier with inherent CO_(2)capture.The development of oxygen carriers with low cost and high redox performance is crucial to the whole efficiency of CLC process.As the solid by-product from the sulfuric acid production,Pyrite cinder presented excellent redox performance as an oxygen carrier in CLC process.The main components in Pyrite cinder are Fe_(2)O_(3),CaSO_(4),Al_(2)O_(3)and SiO_(2)in which Fe_(2)O_(3)is the active component to provide lattice oxygen.In order to systematic investigate the functions of supports(CaSO_4,Al_(2)O_(3)and SiO_(2))in Pyrite cinder,three oxygen carriers(Fe_(2)O_(3)-CaSO_(4),Fe_(2)O_(3)-Al_(2)O_(3)and Fe_(2)O_(3)-SiO_(2))were prepared and evaluated in this study.The results showed that Fe_(2)O_(3)-CaSO_(4) displayed high redox activity and cycling stability in the multiple redox cycles.However,both Fe_(2)O_(3)-Al_(2)O_(3)and Fe_(2)O_(3)-SiO_(2)experienced serious deactivation during redox reactions.It indicated that the inert Fe-Si solid solution(Fe_(2)SiO_(4))was formed in the spent Fe_(2)O_(3)-SiO_(2)sample,which decreased the oxygen carrying capacity of this sample.The XPS results showed that the oxygen species on the surface of Fe_(2)O_(3)-CaSO_(4) could be fully recovered after the 20 redox cycles.It can be concluded that CaSO_(4) is the key to the high redox activity and cycling stability of Pyrite cinder.

关键词： Chemical looping Pyrite cinder Supports Fixed-bed Redox performance Waste treatment

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Reduction of Pyrite cinder Pellets Mixed with Coal Powder

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Journal of Iron and Steel Research(International) 2014年第7期21卷 653-659页

作者： Xiang-dong XING Jian-liang ZHANG Zhen-yang WANG Ke-xin JIAO Xing-le LIU Shan REN College of Metallurgical and Ecological Engineering University of Science and Technology Beijing College of Metallurgical Engineering Xi'an University of Architecture and Technology

Direct reduction of Pyrite cinder in a rotary hearth furnace （RHF） was studied under the condition of labo ratory simulation. Effects of reduction temperature, reduction time, molar ratio of carbon to oxygen, .and CaO addition on metallization rate as well as compressive strength of the pellets after reduction were discussed. The results showed that the metallization rate and compressive strength were 93.9% and 2 160 N per pellet respectively under the conditions of the reduction temperature of 1 200 ℃, the reduction time of 16 min, and the molar ratio of carbon to oxygen （xc/xo） of 1. 0; adding 2.5% CaO was beneficial to sulfur enrichment in slag phase of pellet, and metal- lization rate increased slightly while compressive strength decreased.

关键词： Pyrite cinder metallization rate compressive strength pellet coal powder

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Process Optimization and Reaction Mechanism of Removing Copper From an Fe-Rich Pyrite cinder Using Chlorination Roasting

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Journal of Iron and Steel Research(International) 2013年第8期20卷 20-26页

作者： LIU Jian WEN Shu-ming CHEN Yu LIU Dan BAI Shao-jun WU Dan-dan Faculty of Land Resource Engineering Kunming University of Science and Technology Dongbao District Administration of Work Safety

The aim is to remove copper from a Pyrite cinder by optimizing the chlorination roasting process using re-sponse surface methodology （RSM） and the reaction mechanism of chlorination roasting based on thermodynamic calculation was discussed. A quadratic model was suggested by RSM to correlate the key parameters, namely, dos-age of chlorinating agent, roasting temperature and roasting time to the copper volatilization ratio. The results indi- cate that the model is well consistent with the experimental data at a correlation coefficient （R2） of 0.95, and the dosage of chlorinating agent and roasting temperature both have significant effects on the copper volatilization ratio. However, a roasting temperature exceeding 1170 ~C decreases the volatilization ratio. The optimum conditions for removing copper from the cinder were identified as chlorinating agent dosage at 5%, roasting temperature at i155.10 ℃ and roasting time of 10 min; under Such a conditiom a copper volatilization ratid of 95.16% Was a- chieved from the cinder. Thermodynamic calculation shows that SiO2 in the pellet plays a key role in the chlorine re-lease from calcium chloride, and the chlorine release reactions cannot occur without it.

关键词： process optimization chlorination roasting Pyrite cinder removing copper

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Utilization of High Sulfur Raw Materials in Iron Ore Pellets

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Journal of Iron and Steel Research(International) 2013年第10期20卷 32-38页

作者： ZHU De-qing RUAN Zhi-yong CHUN Tie-jun PAN Jian School of Minerals Processing and Bioengineering Central South University Liuzhou Iron and Steel Group

Pyrite cinder and high sulfur magnetite were used as raw materials to produce iron ore pellets. Good quali ties of green balls and fired pellets were obtained from the feed comprising 50G Pyrite cinder and 50% high sulfur magnetite concentrate at a small scale. Small scale tests were proven by pilot-scale tests. The high grade fired pel lets, assaying 63. 22% Fe, were analyzed, and the compressive strength of fired pellets was over 2 500 N/pellet. The fired pellets possessed excellent metallurgical performances, such as reducibility index higher than 67%, reduction swelling index lower than 15% and low temperature reduction degradation index （＋ 3.15 mm） higher than 1%, which can be used as the hurden for blast furnace.

关键词： Pyrite cinder high sulfur magnetite iron ore pellet metallurgical performance

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黄铁矿烧渣中重金属的化学形态及分级提取-ICP-MS分析

黄铁矿烧渣中重金属的化学形态及分级提取-ICP-MS分析

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第四届海峡两岸分析化学学术会议

作者：张平齐剑英杨春霞李丽玲陈永亨广州大学环境科学系广州大学环境科学系广州大学环境科学系广州大学环境科学系广州大学环境科学系

＜正＞黄铁矿烧渣是精矿焙烧后产生的尾渣,可开发为铁精粉作为炼铁原料,或是做助熔剂用于水泥生产、做掺和料用于建筑工程。由于烧渣成分复杂,主要为磁铁矿、赤铁矿、硅酸盐等矿物, 还含有多种重金属元素,在我国的利用仅为三分之一左右... 详细信息

＜正＞黄铁矿烧渣是精矿焙烧后产生的尾渣,可开发为铁精粉作为炼铁原料,或是做助熔剂用于水泥生产、做掺和料用于建筑工程。由于烧渣成分复杂,主要为磁铁矿、赤铁矿、硅酸盐等矿物, 还含有多种重金属元素,在我国的利用仅为三分之一左右。大量的烧渣还是露天堆放,对土壤和水体造成污染,直接或间接危及生态平衡和人体健康。因此,开展黄铁矿烧渣综合利用的同时, 关注其环境问题具有重要的现实意义。

关键词： Pyrite cinder heavy metal chemical state sequential chemical extraction ICP-MS

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