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Basic characteristics of Australian iron ore concentrate and its effects on sinter properties during the high-limonite sintering process

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International Journal of Minerals,Metallurgy and Materials 2017年第9期24卷 991-998页

作者： Dong-hui Liu Hao Liu Jian-liang Zhang Zheng-jian Liu Xun Xue Guang-wei Wang Qing-feng Kang School of Metallurgy and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Xuanhua iron&Steel Group Co.Ltd. Xuanhua 075100China Beijing Shenwu Environment&Energy Technology Co. Ltd.Beijing 102200China

The basic characteristics of Australian iron ore concentrate (ore-A) and its effects on sinter properties during a high-limonite sintering process were studied using micro-sinter and sinter pot methods. The results show that the ore-A exhibits good granulation properties, strong liquid flow capability, high bonding phase strength and crystal strength, but poor assimilability. With increasing ore-A ratio, the tumbler index and the reduction index (RI) of the sinter first increase and then decrease, whereas the softening interval (Delta T) and the softening start temperature (T (10%)) of the sinter exhibit the opposite behavior; the reduction degradation index (RDI+3.15) of the sinter increases linearly, but the sinter yield exhibits no obvious effects. With increasing ore-A ratio, the distribution and crystallization of the minerals are improved, the main bonding phase first changes from silico-ferrite of calcium and aluminum (SFCA) to kirschsteinite, silicate, and SFCA and then transforms to 2CaO center dot SiO2 and SFCA. Given the utilization of ore-A and the improvement of the sinter properties, the ore-A ratio in the high-limonite sintering process is suggested to be controlled at approximately 6wt%.

关键词： iron ore concentrate limonite basic characteristics sinter properties sintering process

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Central composite design for optimization and formulation of desulphurization of iron ore concentrate using atmospheric leaching process

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Journal of iron and Steel Research(International) 2018年第1期25卷 57-64页

作者： Ali Mostafavi Hassan Rezvanipour Dariush Afzali Tayebeh Shamspur Amir Hajizadehomran Department of Chemistry Shahid Bahonar Universityof Kerman Kerman 84156-83111 Iran Gol-e-Gohar iron ore Mining and Industrial Company Sirjan Km 50 of Shiraz road 111/78185 Kerman Iran Department of Environment Institute of Science and HighTechnology and Environmental Sciences GraduateUniversity of Advanced Technology Kerman 76311-33131Iran

Owing to the negative effects of sulphur in iron ore on steelmaking process and environment, a tank leaching process was performed in atmospheric conditions to remove the sulphur from the iron ore concentrate and simultaneously to transform sulphide minerals into useful by-products. To achieve desirable sulphur removal rate and efficiency, central composite design was adopted as a response surface methodology for the optimization and evaluation of the process. A full-quadratic polynomial equation between the sulphur removal and the studied parameters was established to assess the behaviour of sulphur removal as a function of the factors and to predict the results in various conditions. The optimum conditions were obtained based on the variance tests and response surface plots, from which the optimized ranges for each factor resulting in the best response （corresponding to the highest percentage of desulphurization） could be then achieved. The results show that most desirable conditions are atmospheric leaching in 1.39 mol/dm3 nitric acid and 0.88 mol/dm3 sulphuric acid for 47 h. The designed process under the optimized desulphurization conditions was applied to a real iron ore concentrate. More than 75% of the total sulphur was removed via the leaching process. In addition to the desulphurization, the conversion of sulphide-bearing minerals into useful by-products, extraction of valuable metals, and executing the process under atmospheric conditions are the other advantages of the proposed method.

关键词： Desulphurization iron ore concentrate Sulphide mineral leaching Central composite design Atmosphericleaching process

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Research on Microwave Heating-Direct Steelmaking in Electric Furnace

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Journal of iron and Steel Research(International) 2005年第2期12卷 16-19页

作者： CHENJin LIULiu ZENGJia-qing RENRui-gang LIUJin-ying CentralironandSteelResearchInstitute Beijing100081China CentralironandSteelResearchInstitute Beijing100081China／／TaiyuanUniversityofTechnologyTaiyuan030024China XuanhuaironandSteelGroupCo Zhangjiakou175100China VaccumElectonicsResearchInstitute Beijing100016China

Self-fluxing iron ore concentrates containing coal have good microwave Absorbability. With the voluminal heating property of microwave, the concentrates can be reduced uniformly and swiftly. The metallized semi-product can be directly charged into electric furnace for making clean steel. The total consumed energy of overall route is about 20 98 GJ.

关键词： microwave heating iron ore concentrate coal electric furnace steelmaking

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