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| 1 | Recovery of Iron From High-Iron Red Mud by Reduction Roasting With Adding Sodium Salt显示文摘Red mud is the waste generated during aluminum production from bauxite, containing lots of iron and other valuable metals. In order to recover iron from red mud, the technology of adding sodium carbonate-reduction roasting-magnetic separation to treat high-iron red mud was developed. The effects of sodium carbonate dosage, reduction temperature and reduction time on the qualities of final product and the phase transformations in reduction process were discussed in detail. The results showed that the final product (mass percent), assaying Fe of 90.87% and Al2O3 of 0.95% and metallization degree of 94.28% was obtained at an overall iron recovery of 95.76% under the following conditions of adding 8% sodium carbonate, reduction roasting at 1 050 ℃ for 80 min and finally magnetic separation of the reduced pellets by grinding up to 90% passing 0.074 mm at magnetic field intensity of 0.08 T. The XRD (X-ray diffraction) results indicated that the iron oxides were transformed into metallic iron. Most of aluminum mineral and silica mineral reacted with sodium carbonate during the reduction roasting and formed nonmagnetic materials. | ZHU De-qing, CHUN Tie-jun, PAN Jian, HE Zhen (School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China) | 2012 | Journal of Iron and Steel Research(International)2012，19，8： | 38 |
| 2 | Application of P507 and isooctanol extraction system in recovery of scandium from simulated red mud leach solution显示文摘The current recovery technique of Sc was complicated and the chemical consumption was high,This was due to the low content of Sc in resources and the difficulty of stripping.In this research,the isooctanol was added into the 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester(P507)extraction system to reduce the extraction and improve the stripping of Sc.The maximum stripping ratio of Sc from loaded organic phase by sulfuric acid can increase from 10%(without isooctanol)to 99%(with 15 vol%isooctanol).In the extraction test of the simulated red mud leaching liquor,the separation factors between Sc and Zr,Sc and Ti are 36 and 350,separately.At the same time,other metals are almost not extracted.The high selectivity and stripping of Sc suggest that the P507 with isooctanol extraction system can be applied in the practical Sc recovery process. | Chuanying Liu Li Chen Ji Chen Dan Zou Yuefeng Deng Deqian Li | 2019 | Journal of Rare Earths2019，37，9： | 22 |
| 3 | Durability and microstructure analysis of the road base material prepared from red mud and flue gas desulfurization fly ash显示文摘The present study aimed to investigate the durability and microstructure evolution of road base materials(RBM)prepared from red mud and flue gas desulfurization fly ash.The durability testing showed that the strength of RBM with the blast furnace slag addition of 1wt%,3wt%and 5wt%reached 3.81,4.87,and 5.84 MPa after 5 freezing–thawing(F–T)cycles and reached 5.21,5.75,and 6.98 MPa after 20 weting–drying(W–D)cycles,respectively.The results also indicated that hydration products were continuously formed even during W–D and F–T exposures,resulting in an increase of the strength and durability of RBM.The observed increase of macropores(>1μm)after F–T and W–D exposures suggested that the mechanism of RBM deterioration is pore enlargement due to cracks that develop inside their matrix.Moreover,the F–T exposure showed a greater negative effect on the durability of RBM compared to the W–D exposure.The leaching tests showed that sodium and heavy metals were solidified below the minimum requirement,which indicates that these wastes are suitable for use as a natural material replacement in road base construction. | Emile Mukiza Ling-ling Zhang Xiao-ming Liu | 2020 | International Journal of Minerals,Metallurgy and Materials2020，27，4： | 10 |
| 4 | Complementation in the composition of steel slag and red mud for preparation of novel ceramics显示文摘A method for preparing novel ceramics was developed in this study. Different ratios red muds were added to steel slags to optimize the preparation of novel ceramics by a traditional ceramic preparation process. The sintering mechanism, microstructure, and performance were studied by X-ray diffraction techniques, scanning electron microscopy, and combined experiments of linear shrinkage, water absorption, and flexural strength. The results confirmed that red mud can reduce the volumetric instabilities through the complementarity of red mud and ferroalloy slag. The crystal phases in the ceramics are all pyroxene group minerals, including diopside ferrian, augite, and diopside. The flexural strength of the ceramic that contains 40 wt% red mud and was prepared at the optimal sintering temperature(1140°C) is greater than 93 MPa; its corresponding water absorption is less than 0.05%. | Yan-bing Zong Wen-hui Chen Yong Fan Tai-lin Yang Zhao-bo Liu Da-qiang Cang | 2018 | International Journal of Minerals,Metallurgy and Materials2018，25，9： | 7 |
| 5 | Investigation of the medium calcium based non-burnt brick made by red mud and fly ash: durability and hydration characteristics显示文摘Red mud is a type of highly alkaline waste residue produced in the process of alumina smelting by the Bayer process.Based on the idea of medium calcium content,solid wastes such as red mud and fly ash were used to prepare non-burnt bricks;and the mass ratio of CaO/SiO2 was selected in the range of 0.88–1.42.Mechanical properties and durability were investigated with a compressive strength test.X-ray diffractometry(XRD),scanning electron microscope(SEM),and Fourier transform infrared spectroscopy(FTIR)techniques were used to characterize the hydration characteristic.The environmental performance was analyzed by Inductively Coupled Plasma Mass Spectrometry(ICP).The results indicated that the mechanical properties and the durability were optimal when the mass ratio of CaO/SiO2 was 1.23.The hydration products were mostly C–S–H gel,ettringite,Na4Ca(Si10All6)O32·12H2O and Ca3Al2(SiO4)(OH)8.They were responsible for the strength development,and the CaO/SiO2 mass ratio of 1.23 had the best polymerized structure.The results of an environmental performance test showed that the heavy metals in the raw materials were well-solidified in the brick.Therefore,this paper provides an effective solution for use of solid wastes in building material. | Ying-tang Xu Bo Yang Xiao-ming Liu Shuai Gao Dong-sheng Li Emile Mukiza Hua-jian Li | 2019 | International Journal of Minerals,Metallurgy and Materials2019，26，8： | 7 |
| 6 | INFLUENCE OF ADDITIVES ON SLAG-IRON SEPARATION DURING DIRECT REDUCTION OF COAL-BASE HIGH-IRON-CONTENTREDMUD显示文摘INFLUENCEOFADDITIVESONSLAG-IRONSEPARATIONDURINGDIRECTREDUCTIONOFCOAL-BASEHIGH-IRON-CONTENTREDMUDQiuGuanzhou;LiuYongkang;Jiang... | Qiu Guanzhou Liu Yongkang Jiang Tao Hu Yuehua Mei Xiangong(Department of Mineral Engineering,Central South University of Technology, Changsha 410083) | 1996 | 中国有色金属学会会刊:英文版1996，6，2： | 2 |
| 7 | Influence of CRT Glass Quantity on the Properties of Red Mud-CRT Glass Ceramics Fired at Different Temperatures显示文摘This paper reports the production of ceramics using CRT(cathode ray tube)glass and red mud by varying the amount of waste glass and firing from 700-950℃.The raw materials were characterized using chemical composition,IR(infra-red spectroscopy),XRD(X-ray diffraction),DSC-TGA(differential scanning calorimetry-thermo gravimetric analyses)and SEM(scanning electron microscopy)analysis.The ceramic specimen was produced by mixing a constant quantity of red mud and 0%-40%of waste glass,then firing from 700-950℃.The linear shrinkage,water absorption,apparent porosity,bulk density,weight loss on ignition,flexural strength and chemical resistance test were used to evaluate the produced ceramics.Raw materials had good fluxing properties which were improved with firing.All the specimens produced had water absorption values below the maximum value of 20% specified by the norm for roofing tiles while specimens with 30%-40% CRT glass and fired at 850°C,and specimens with 20%-40% CRT glass and fired at 950℃ had water absorption values below 10%,which is the norm for ceramic tiles.For specimens 0%-40% CRT glass fired at 950℃,specimens 5%-40% CRT glass fired at 850℃,specimens 10%-40% CRT glass fired at 750℃ and specimen with 20%CRT glass fired at 700℃,water absorption values were all lower than 17% which is ASTM C62 specifications for bricks.The norm of flexural strength for floor tiles>25 MPa but all values were less than 25 MPa.The ceramic shows a maximum loss of 0.10%in HNO3 against 0.06%for NaOH.The two waste materials can effectively be used to produce ceramic materials with good properties. | Paul Nestor Djomou Djonga Cornelius Tsamo Harouna Massai | 2019 | 材料科学与工程(中英文B版)2019，9，4： | 1 |
| 8 | Kinetics of carbonated decomposition of hydrogarnet with different silica saturation coefficients显示文摘Carbonated decomposition of hydrogarnet is one of the vital reactions of the calcification–carbonation method,which is designed to dispose of low-grade bauxite and Bayer red mud and is a novel eco-friendly method.In this study,the effect of the silica saturation coefficient(x)on the carbonation of hydrogarnet was investigated from the kinetic perspective.The results indicated that the carbonation of hydrogarnets with different x values(x=0.27,0.36,0.70,and 0.73)underwent two stages with significantly different rates,and the kinetic mechanisms of the two stages can be described by the kinetic functions R3 and D3.The apparent activation energies at Stages 1 and 2 were 41.96–81.64 and 14.80–34.84 kJ/mol,respectively.Moreover,the corresponding limiting steps of the two stages were interfacial chemical reaction and diffusion. | Xiao-feng Zhu Ting-an Zhang Guo-zhi Lü | 2020 | International Journal of Minerals,Metallurgy and Materials2020，27，4： | 1 |
| 9 | RED MUD显示文摘China’s deadly construction waste woes深圳滑坡事故是一场人祸,发展余泥渣土回收利用技术或许可以避免悲剧再次发生Everything He Weiming knew disappeared on December 20,2015,when a landslide hit the Guangming New District of Shenzhen.His parents,sister,wife,and son took their last breaths under a thick pile of red mud.The landslide destroyed 33 | 刘莎 | 2016 | The World of Chinese2016，0，2： | 0 |
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