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Removal of dolomite and potassium feldspar from apatite using simultaneous flotation with a mixed cationic-anionic collector

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International Journal of Mining Science and technology 2023年第6期33卷 783-791页

作者： Haoyong Yu Yangge Zhu Liang Lu Xiaoxing Hu Songqing Li State Key Laboratory of Mineral Processing Science and technology BGRIMM Technology GroupBeijing 102628China

This study aims to investigate the effect of a cationic-anionic mixed collector(dodecyltrimethyl ammonium bromide/sodium oleate(DTAB/NaOL)on the selective separation of apatite,dolomite,and potassium ***,several experimental methods,including flotation experiments,zeta-potential detection,microcalorimetry detection,XPS analysis and FTIR measurements,were *** flotation tests showed that dolomite and potassium feldspar can be successfully removed from apatite simultaneously when the molar ratio of DTAB to NaOL was 2:1 with pH ***-potential and microcalorimetry detection suggested that NaOL and DTAB were adsorbed on the surface of dolomite and potassium feldspar respectively,and part of NaOL and DTAB formed co-adsorption on the surface of potassium feldspar to enhance the floatability of potassium *** XPS and FTIR spectra analysis demonstrated that the cationic collector,DTAB,was first adsorbed on the surface of potassium feldspar through electrostatic attraction in the DTAB/NaOL mixture ***,the anionic NaOL collector and cationic DTAB collector form an electron neutralisation complex,thereby resulting in co-adsorption on the surface of potassium *** was chemically reacted and adsorbed on dolomite surface,but almost no collector was adsorbed on apatite ***,the adsorption models of different collectors on mineral surface were obtained.

关键词： Flotation Mixed collectors Apatite Potassium feldspar Dolomite

Influence of desulfurization slag containing oxides of vanadium and titanium on semi-steel pre-desulfurization

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Journal of Iron and Steel Research International 2022年第6期29卷 939-950页

作者： Bi-wen Yang Yi-hang Hu San-ping Liu Xue-dong Zhang Chao-zhen Zheng Hai-bei Wang Research and Design Institute of Metallurgical BGRIMM Technology GroupBeijing 100160China College of Engineering Peking UniversityBeijing 100871China

The desulfurization and resulfurization of slag containing oxides of vanadium and titanium(CaO–SiO_(2)–MgO–Al_(2)O_(3)–V_(2)O_(3)–TiO_(2)–FeO)in the pretreatment of semi-steel desulfurization at 1623 K were *** on the ionic structure theory of slag,it could be concluded that V_(2)O_(3) and TiO_(2) combined with(O_(2)–)to form complex anions including VO_(3)^(3–),TiO_(4)^(4–),etc.,which reduced the activity of(O_(2)–)and decreased the sulfur partition ratio(LS).And FeO enhanced the activity of[O]at the slag–metal interface,which decreased the desulfurization capacity of the *** to the binary basicity,the presented basicity expression containing V_(2)O_(3) and TiO_(2) described the relationship between LS and basicity more *** the problems of dilute slag,a large amount of residual slag and much resulfurization in the slagging-off process after pretreatment,the effect of CaO+C-based slag modifier on the resulfurization,melting point and viscosity of the desulfurization slag was *** was proposed that adding 5%–10%of the slag modifier to the desulfurization slag after desulfurization decreased the resulfurization *** the added modifier adjusted the slag viscosity well,which helped to reduce iron loss and residual slag.

关键词： Semi-steel Desulfurization Resulfurization Vanadium oxide Titanium oxide Slag modifier

Study on tungsten sintering temperature field based on electromagnetic simulation and computational fluid dynamics

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Tungsten 2024年第2期6卷 355-366页

作者： Lu-Yan Wang Yue-Guang Yu Jian-Xin Dong Kai-Ping Du Shan-Yu Liu Cao-Bing Li University of Science and technology Beijing Beijing 100083China bgrimm technology group Beijing 100160China China Iron&Steel Research Institute group Beijing 100081China

In order to study the influence of various sintering variables more intuitively and clearly,electromagnetic field analysis and computational fl uid dynamics are used to analyze the infl uence of gas flow,heating power and other process parameters on the temperature range of medium-frequency sintering in this *** results indicate that the uniformity of temperature fi eld is determined by the gas flow rate and heating *** the heating power is 50 kW,the stable temperature drops about 10 K for every 1 m^(3)·h^(−1)increase of hydrogen *** peak value of the maximum temperature diff erence on the tungsten rods gradually increases with the increase of the hydrogen flow rate,and it appears slightly *** temperature distribution of tungsten rods in furnace is similar with diff erent hydrogen flow *** the same time,the closer to the furnace wall,the higher the temperature of the tungsten *** temperature diff erence between tungsten rods mainly occurred within 1 h after the beginning of *** the heating power can improve the stable temperature,but has little eff ect on the heating *** heating power can increase the peak value of the maximum temperature diff erence on the tungsten rods,but has little eff ect on the occurrence time of the peak value of the maximum temperature diff erence on the tungsten *** the heating power will increase the temperature diff erence of a single tungsten rod,but the temperature diff erence of a single tungsten rod never exceeds 65 *** study can be used to guide the process optimization *** with numerical simulation calculation,the sintering parameters with low energy consumption and high temperature uniformity can be quickly and eff ectively found,thus improving the microstructure and properties of sintered tungsten products.

关键词： Tungsten products Sintering Hydrogen flow rate Heating power

Development of high-performance dry-pressed anisotropic permanent ferrite for La-Ca-Sr-Co system

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Rare Metals 2020年第1期39卷 89-94页

作者： Dai-Man Zhu Zhao-Wen Geng Rong-Ming Liu Xiao-Wen Zhou Li-Ying Jia Guo-Hui Hu Qian Wang Bing-Shan Li National Engineering technology Research Center for Magnetic Materials BGRIMMBeijing102600China bgrimm Magnetic Materials and technology(Fuyang)Co. Ltd.Fuyang236000China

In this work,the BMS-12 pre-sintered material was used as the basic material,and the optimal secondary additive addition amount was found by the wet pressing ***,the anisotropic ferrite material was prepared by dry-pres sing method,and the effects of camphor adhesives,calcium stearate lubricant and powder particle size on the magnetic properties were *** experimental results show that the appropriate addition amount of camphor adhesive and calcium stearate lubricant is 0.6 wt%and 0.8 wt%,*** remanence and coercivity can be obtained for particle size of 0.85-1.00μ*** dry-pressed magnet ferrite was prepared with typical properties of magnetic induction intensity of Br=421 mT,induction coercivity of Hcb=296 kA·m-1,intrinsic coercivity of Hcj=369 kA·m-1 and maximum energy product of(BH)max=33.3 kJ·m-3,which have reached the level of TDK corporation product of FB5 *** shows that the dry-pressed magnet of La-Ca-Sr-Co system has higher remanence and intrinsic coercivity than the traditional wetpressed Sr-ferrite.

关键词： Dry-press molding Permanent magnetic ferrite La-Ca-Sr-Co system Magnetic properties

Direct leaching of molybdenum and lead from lean wulfenite raw ore

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Transactions of Nonferrous Metals Society of China 2019年第12期29卷 2638-2645页

作者： Keng XIE Hai-bei WANG Sheng-dong WANG bgrimm technology group Beijing 100160China

A direct alkaline leaching process was proposed to extract molybdenum and lead from low-grade wulfenite ore containing 2.87%Mo and 9.39%*** results show that increasing temperature and alkali concentration enhances the extraction of Mo and Pb,and more than 99.7%of Mo and 64.6%of Pb are extracted under conditions of 75℃,L/S of 2:1,leaching time of 1.0 h,initial NaOH concentration of 80 g/L and stirring speed of 100 r/*** alkaline leaching of molybdenum follows a chemical reaction control mechanism with activation energy of 46.3 kJ/*** in the residue is recovered by hydrochloric acid leaching.99.8%of lead is leached under the conditions of 80℃,[MnO2]/[Pb]molar ratio of 1.3:1,sodium chloride concentration of 40 g/L,and hydrochloric acid concentration of 3 mol/L,and a product of crystallized PbCl2 with purity higher than 99.5%is obtained after cooling.

关键词： wulfenite molybdenum lead leaching kinetics

Eliminating crystal water enables enhanced sodium storage performance in an oxalate-phosphate cathode material

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Chinese Chemical Letters 2023年第8期34卷 333-336页

作者： Kena Sun Huiwu Long Xiaowu Jie Huangxu Li bgrimm technology group Beijing 100160China Department of Chemistry City University of Hong KongHong Kong 999077China

The oxalate-phosphate polyanion-mixed cathode materials are promising for sodium-ion batteries(SIBs)due to their unique open-framework structures and high voltage ***,materials of this type generally contain crystal water molecules in the lattice frameworks,which may affect their energy storage *** work aims to disclose the impacts of crystal water on physiochemical and electrochemical properties of Na_(2)(VO)_(2)(HPO_(4))_(2)(C_(2)O_(4))·2H_(2)O(NVPC-W).It shows that the water molecules can be eliminated by vacuum drying at 150°*** elimination of water molecules does not change the crystal phase of the material,while the obtained Na_(2)(VO)_(2)(HPO_(4))_(2)(C_(2)O^(4))(NVPC)exhibits significant improvements in cycling stability,Coulombic efficiency,as well as rate *** analysis indicates that the existence of lattice water molecules hinders sodium-ion diffusion and promotes the degradation of *** believe the findings can help to develop high-performance cathode materials.

关键词： V-based materials Cathode Energy storage Crystal water Battery

Anodic process of stibnite in slurry electrolysis:The direct collision oxidation

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Chinese Journal of Chemical Engineering 2022年第1期35卷 466-472页

作者： Yonglu Zhang Dingfan Qiu Chengyan Wang Yongqiang Chen Zhichao Yao Xiaowu Jie Wei Gao Shufeng Ruan State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China bgrimm technology group Beijing 100160China

Mineral oxidation leaching in the anode area is the key step in slurry *** adopting the slow linear potential scanning method during slurry electrolysis,this study investigated the steady-state polarization curve of a pure stibnite mineral on a graphite *** addition,the influence of the mineral particle size,liquid–solid ratio,stirring speed,and temperature on the collision oxidation of the mineral with the anode was *** on the different oxidation reactions,the potential range can be divided into three intervals:the low-potential interval with a potential lower than 0.75 V,an intermediatepotential interval with a potential within 0.75–1.2 V,and a high-potential interval with a potential higher than 1.2 *** collision oxidation of the mineral with the anode occurred in all three *** oxidation of Sb(III)also appeared in the intermediate-and high-potential intervals,and chlorine evolution occurred in the high-potential ***,the low-potential interval was determined to be a suitable potential interval for the slurry electrolysis *** the low-potential interval,the particle size,liquid–solid ratio,and stirring speed had little effect on the oxidation rate of the *** the temperature increased,the stibnite oxidation rate and exchange current density ***,the direct collision oxidation rate of stibnite was relatively low and the current densities under all the investigated conditions were lower than 0.4 mA·cm^(-*** indicates that it is difficult to realize industrial production while relying solely on this process.

关键词： Slurry electrolysis Stibnite Potential range Potential interval Steady-state polarization curve

Physical model investigation on effects of drainage condition and cement addition on consolidation behavior of tailings slurry within backfilled stopes

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International Journal of Minerals,Metallurgy and Materials 2023年第8期30卷 1490-1501页

作者： Qinghai Ma Guangsheng Liu Xiaocong Yang Lijie Guo School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China bgrimm technology group Beijing 100160China National Centre for International Research on Green Metal Mining Beijing 100160China

Estimation of stressses within the tailings slurry during self-weight consolidation is a critical issue for cost-effective barricade design and efficient backfill planning in underground mine *** process requires a good understanding of self-weight consolidation behaviors of the tailings slurry within practical stopes,where many factors can have significant effects on the consolidation,including drainage condition and cement *** this paper,the prepared tailings slurry with different cement contents(0,4.76wt%,and 6.25wt%)was poured into1.2 m-high columns,which allowed three drainage scenarios(undrained,partial lateral drainage near the bottom part,and full lateral drainage boundaries)to investigate the effects of drainage condition and cement addition on the consolidation behavior of the tailings *** consolidation behavior was analyzed in terms of pore water pressure(PWP),settlement,volume of drainage water,and residual water *** results indicate that increasing the length of the drainage boundary or cement content aids in PWP *** addition,constructing an efficient drainage boundary was more favorable to PWP dissipation than increasing cement *** final stable PWP on the column floor was not sensitive to cement *** final settlement of uncemented tailings slurry was independent of drainage conditions,and that of cemented tailings slurry decreased with the increase in cement ***,more pore water can drain out from the cemented tailings slurry than the uncemented tailings slurry during consolidation.

关键词： tailings backfill consolidation slurry drainage cement content physical model test

Innovative pre-concentration technology for recovering ultrafine ilmenite using superconducting high gradient magnetic separator

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International Journal of Mining Science and technology 2021年第6期31卷 1043-1052页

作者： Zhitao Yuan Xuan Zhao Jiwei Lu Hong Lv Lixia Li School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China bgrimm technology group Beijing 100160China China ENFI Engineering Co. Ltd.Beijing 100038China

To achieve the utilization of the abandoned ultrafine ilmenite(-20 μm) produced in the titanium magnetite processing plant in Panzhihua,the superconducting high-gradient magnetic separation(SMS) technology was proposed in this *** optimizing the conditions of magnetic intensity,feeding and pulsation,an SMS concentrate with TiO_(2) grade of 16.03% and TiO_(2) recovery of 66.39% was obtained through one roughing-one cleaning pre-concentration *** specific magnetic force and magnetic force were calculated and analysed to illustrate the pre-concentration mechanism,and the results revealed that the combination of high magnetic field and strong pulsating resulted in the effective preconcentration of the ultrafine ilmenite in the SMS *** addition,the magnetic force analysis indicated that the high magnetic intensity and high magnetic gradient are the key factors of the SMS ***,the EDS-Mapping detection certified that the ultrafine ilmenite was concentrated from the gangue minerals using SMS technology.

关键词： Ultrafine ilmenite Superconducting high gradient magnetic separation Pre-concentration EDS-Mapping