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An integrated and efficient process for borax preparation and magnetite recovery from soda-ash roasted ludwigite ore under CO–CO_(2)–N_(2) atmosphere

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International Journal of Minerals,Metallurgy and Materials 2023年第11期30卷 2169-2181页

作者： Jinxiang You Jing Wang Mingjun Rao Xin Zhang Jun Luo Zhiwei Peng Guanghui Li School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

To realize the comprehensive utilization of ludwigite ore,an integrated and efficient route for the boron and iron separation was proposed in this work,which via soda-ash roasting under CO–CO_(2)–N_(2) atmosphere followed by grind-leaching,magnetic separation,and CO_(2) *** effects of roasting temperature,roasting time,CO/(CO+CO_(2))composition,and Na_(2)CO_(3) dosage on the boron and iron separation indices were primarily *** the optimized conditions of the roasting temperature of 850℃,roasting time of 60 min,soda ash dosage of 20 wt%,and CO/(CO+CO_(2)) of 10 vol%,92%of boron was leached during wet grinding,and 88.6%of iron was recovered during the magnetic separation and magnetic concentrate with a total iron content of 61.51 wt%.Raman spectra and^(11)B NMR results indicated that boron exists asB(OH)_(4)^(-) in the leachate,from which high-purity borax pentahydrate could be prepared by CO_(2) carbonation.

关键词： ludwigite ore soda-ash roasting CO-CO_(2)-N_(2)atmosphere borax

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Comprehensive Utilization of ludwigite ore Based on Metallizing Reduction and Magnetic Separation

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Journal of Iron and Steel Research International 2015年第8期22卷 672-680页

作者： Xiao-jiao FU Jia-qi ZHAO Shuang-yin CHEN Zheng-gen LIU Tong-lai GUO Man-sheng CHU School of Materials and Metallurgy Northeastern University

With the aim of high-efficiency utilization of Dandong ludwigite ore, a new process of metallizing reduction and mag- netic separation was proposed, and the effects of reduction temperature, reduction time, carbon ratio, ore size and coal size on the efficiency of the process were investigated in details, and relevant mechanisms were elucidated by SEM and EDS. The optimum technological parameters for metallizing reduction and magnetic separation on ludwigite ore were obtained as reduction tempera- ture of 1 250 ℃, reduction time of 60 min, carbon ratio of 1.4, ore size of 0.500-2.000 mm, and coal size of 0.50-1.50 mm. After adopting the optimum parameters, the iron content and recovery ratio of iron in magnetic substance are 87.78% and 88.02%, re- spectively, while the recovery ratios of boron, magnesium and silicon in non-magnetic substance are 88.86%, 94.60% and 98.66%, respectively. After metallizing reduction and magnetic separation, valuable elements of ludwigite ore could be separated and uti- lized in subsequent steelmaking process and hydrometallurgy process.

关键词： ludwigite ore metallizing reduction magnetic separation valuable element comprehensive utilization

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维普期刊数据库

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Growth of metallic iron particles during reductive roasting of boron-bearing magnetite concentrate

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Journal of Central South University 2020年第5期27卷 1484-1494页

作者： ZHANG Xin LI Guang-hui RAO Ming-jun MI Huan-peng LIANG Bin-jun YOU Jin-xiang PENG Zhi-wei JIANG Tao School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China

The growing characteristics of metallic iron particles during reductive roasting of boron-bearing magnetite concentrate under different conditions were *** size of the metallic iron particles was quantitatively measured via optical image analysis with consideration of size calibration and weighted ratio of image numbers in the core,middle and periphery zones of cross-section of *** order to guarantee the measurement accuracy,54 images were captured in total for each specimen,with a weighted ratio of 1:7:19 with respect to the core,middle and periphery section of the cross-section of *** reduction temperature and time is favorable to the growth of metallic iron *** on the modification of particle size measurement,in terms of time(t)and temperature(T)a predicting model of metallic iron particle size(D),was established as:D=125−0.112t−0.2352T−5.355×10^−4t^2+2.032×10^−4t∙T+1.134×10^−4T^2.

关键词： ludwigite ore reductive roasting metallic iron grain growth size measurement

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