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Using co_(2)and oxidants for in situ regeneration of permeable reactive barriers for leachate-contaminated groundwater

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Journal of Environmental Sciences 2024年第11期145卷 152-163页

作者： Fangming Xu Xingshen Luo Junlong Huang Yuecen Dong Kaixuan Zheng Yanting Liu Yanjun Liu Hongtao Wang School of Environment Tsinghua UniversityBeijing 100084China School of Chemical and Environmental engineering China University of Mining and Technology(Beijing)Beijing 100083China zhongye changtian international engineering co.ltd. Changsha 410205China

Groundwater contamination near landfills is commonly caused by leachate leakage,and permeable reactive barriers(PRBs)are widely used for groundwater ***,the deactivation and blockage of the reactive medium in PRBs limit their long-term *** the current study,a new methodology was proposed for the in situ regeneration of PRB to remediate leachate-contaminated ***_(2)coupled with oxidants was applied for the dispersion and regeneration of the fillers;by injecting co_(2)to disperse the fillers,the permeability of the PRB was increased and the oxidants could flow evenly into the *** results indicate that the optimumfiller proportion was zero-valent iron(ZVI)/zeolites/activated carbon(AC)=3:8:10 and the optimum oxidant proportion was coD/Na_(2)S_(2)O_(8)/H_(2)O_(2)/Fe^(2+)=1:5:6:5;the oxidation system of Fe^(2+)/H_(2)O_(2)/S_(2)O_(8)^(2−)has a high oxidation efficiency and *** average regeneration rate of zeolites was 72.71%,and the average regeneration rate of AC was 68.40%;the permeability of PRB also *** technology is effective for the remediation of landfills in China that have large contaminated areas,an uneven pollutant concentration distribution,and a long pollution *** purification mode of long-term adsorption and short-time in situ oxidation can be applied to the remediation of long-term high-concentration organically polluted groundwater,where pollution sources are difficult to cut off.

关键词： Landfill leachate Groundwater remediation PRB in situ regeneration Advanced oxidation technology

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Optimal proportioning of iron ore in sintering process based on improved multi-objective beluga whale optimisation algorithm

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Journal of Iron and Steel Research international 2024年第7期31卷 1597-1609页

作者： Zong-ping Li Xu-dong Li Xue-tong Yan Wu Wen Xiao-xin Zeng Rong-jia Zhu Ya-hui Wang Ling-zhi Yi zhongye changtian international engineering co. Ltd.Changsha 410205HunanChina college of Automation and Electronic Information Xiangtan UniversityXiangtan 411105HunanChina college of Electrical and Information engineering Hunan UniversityChangsha 410082HunanChina

Proportioning is an important part of sintering,as it affects the cost of sintering and the quality of sintered *** address the problems posed by the complex raw material information and numerous constraints in the sintering process,a multi-objective optimisation model for sintering proportioning was established,which takes the proportioning cost and TFe as the optimisation ***,an improved multi-objective beluga whale optimisation(IMOBWO)algorithm was proposed to solve the nonlinear,multi-constrained multi-objective optimisation *** algorithm uses the con-strained non-dominance criterion to deal with the constraint problem in the ***,the algorithm employs an opposite learning strategy and a population guidance mechanism based on angular competition and two-population competition strategy to enhance convergence and population *** actual proportioning of a steel plant indicates that the IMOBWO algorithm applied to the ore proportioning process has good convergence and obtains the uniformly distributed Pareto ***,compared with the actual proportioning scheme,the proportioning cost is reduced by 4.3361¥/t,and the TFe content in the mixture is increased by 0.0367%in the optimal compromise ***,the proposed method effectively balances the cost and total iron,facilitating the comprehensive utilisation of sintered iron ore resources while ensuring quality assurance.

关键词： Sintering process Proportioning Iron ore Multi-objective beluga whale optimisation algorithm Proportioning cost

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Nanosize-effect on the distribution of heavy metals in copper smelting dust:Based on sophisticated dust sorting approach

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Nano Research 2024年第1期17卷 312-320页

作者： Ken Li Zuwu Liao Hengdi Ye Qingzhu Li Fenghua Shen Qian Li Hui Liu Qingwei Wang Xu Yan Zhang Lin Liyuan Chai School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National engineering Research Center for control&Treatment of Heavy Metal Pollution Changsha 410083China National engineering Research Center of Sintering and Pelletizing Equipment System Zhongye Changtian International Engineering Co.LtdChangsha 410205China

Dust particles emitted from smelters can be hazardous to ecosystems and humans,as they are often enriched in metallic ***,we combined multi-method mineralogical analysis with a sophisticated size sorting approach for copper smelting dust to study the nanosize-effect on heavy metal distribution,which has hitherto been *** types of dust were collected from a copper flash smelter and then size-sorted using a Dekati low-pressure *** showed that all three samples could easily sort out nanoscale dust particles(could reach 10.71%.The presence of heavy metals(Pb,Zn,Cu,and As)and their mineral species in dust was examined at various particle *** was discovered that different heavy metals are enriched on nanoparticles in specific *** micron-sized particles,heavy metals are generally found in discrete phases(e.g.,CuSO_(4),PbSO_(4),and As_(2)O_(3)).In nanoscale particles,the dominant phase is Fe_(3)O_(4),while heavy metals are mostly found in lattice substitution(e.g.,CuFe_(2)O_(4)and ZnFe_(2)O_(4)).Two distinct nano-dust morphologies were found:One with irregular mesh or chain structures consisting of particles of a few nanometers,and the other with polygonal crystals in larger sizes of hundreds of *** enrichment of heavy metals in the latter morphology is more pronounced,possibly because lattice substitution of heavy metals is more likely to occur when polycrystalline particles are formed.

关键词： copper flue dust size-sorted heavy metal distribution morphology nano-sized effects

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Disposal of zinc extraction residues via iron ore sintering process:an innovative resource utilization

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Journal of Iron and Steel Research international 2024年第7期31卷 1636-1645页

作者： Chun-long Fan Cheng-yi Ding Tao Yang Yun-fei Luo Yi-fan Wang Qian Li Hong-ming Long School of Metallurgical engineering Anhui University of TechnologyMa'anshan 243002AnhuiChina zhongye changtian international engineering co. Ltd.Changsha 410205HunanChina Key Laboratory of Metallurgical Emission Reduction and Resources Recycling(Ministry of Education) Anhui University of TechnologyMa'anshan 243002AnhuiChina

Zinc extraction residue,a solid waste generated from the treatment of zinc-containing dust in rotary kilns,is commonly stockpiled in steel companies for extended *** poses significant disposal challenges and environmental pollution *** far,research on the treatment of zinc extraction residues has been slow,inadequate,and *** this gap,a novel approach was proposed to effectively treat the zinc extraction residue via the iron ore sintering *** was feasible to add 1 wt.%of zinc extraction residues to the sintering raw *** more adequate mineralization reaction resulted in higher yield and tumbler indexes,despite a slight decrease in sintering *** this may result in a slight decrease in sintering speed,the more complete mineralization reaction leads to improved sintering yield and tumbler ***,the addition of zinc extraction residues reduced the co and NO_(x) concentrations in the sintering flue ***,the iron ore sintering process provided a viable solution for resource utilization and environmentally friendly treatment of zinc extraction residues.

关键词： Zinc extraction residue Iron ore sintering co-processing Waste utilization Gas pollutant reduction

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Direct reduction of carburized pre-reduced pellets by microwave heating

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Journal of Central South University 2014年第1期21卷 351-357页

作者：胡兵黄柱成易凌云姜涛 School of Minerals Processing and Bioengineering Central South University zhongye changtian international engineering co. Ltd.

A new iron-making process using carburized pre-reduced iron ore pellets and microwave heating is investigated. The pre-reduced pellets, with a porous structure, and fine particles are carburized homogeneously at 400-650 ℃ in a co atmosphere. The carburized carbon not only acts reaction as a reduction agent, but also absorbs microwave in the reduction process. Hence, the carburized pre-reduced pellets can be rapidly reduced by microwave heating. There are three procedures involved in the process, namely, gas-based pre-reduction, low-temperatttre carburization and deep reduction by microwave heating. Carburized pre-reduced iron ore pellets show a rapid temperature rise that is twice as fast as the results for pre-reduced pellets in the laboratory. This not only improves the efficiency of the microwave heating, but also accelerates the reduction of iron oxides. The temperature of the pre-reduced pellets rises to 1050 ℃ in 45 min when the carburization rate is 2.02%, and the metallization rate and compressive strength reach 94.24% and 1725 N/pellet, respectively.

关键词： oxidized pellets pre-reduction carburizing microwave heating direct reduction

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Life Cycle Assessment of Iron Ore Sintering Process

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Journal of Iron and Steel Research international 2015年第6期22卷 473-477页

作者： Zong-ping LI Xiao-hui FAN Gui-ming YANG Jin-chao WEI Ying SUN Min WANG School of Minerals Processing and Bioengineering Central South University zhongye changtian international engineering co. Ltd.

Iron ore sintering is an energy＇intensive process associated with emission of pollutants in iron and steel in- dustry. In order to comprehensively evaluate the environmental impacts of sintering, a detailed life cycle assessment of a sintering plant was conducted. Life cycle inventory showed that, in the production of 1 t sinter ore, 241.53 kg co2 , 22.68 kg co, 0. 294 kg SO2 , 0.63 kg NO, , 1.18 /lg dioxin and 0.48 kg dust were discharged. Global war- ming potentials, acidification potentials, photochemical ozone creation potentials and human toxicity potentials were selected as four impact categories, and the evaluation index for the sintering plant was calculated as 3.45 × 10 ^-12. Fi nally, based on the environmental impact analysis, several measures of reducing environmental [oadings of the sinte- ring plant were provided, which included the utilization of denitrification equipment, recirculation of the hot waste gas and process improvement to reduce fuel consumption.

关键词： iron ore sintering plant life cycle assessment pollutant emission environmental loading

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control of nitrogen oxides emission by selective non-catalytic reduction in preheating section during iron ore pellets production

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Journal of Iron and Steel Research international 2022年第2期29卷 215-222页

作者： Min Gan Wang Shu Zhi-yun Ji Zhi-an Zhou Xiao-hui Fan Bing Hu Guo-jing Wang Yuan Zhu Ya-fei Sun School of Minerals Processing and Bioengineering Central South UniversityChangsha410083HunanChina zhongye changtian international engineering co. Ltd.Changsha410205HunanChina

Reducing the NO_(x) emission from pelletizing process is of great importance to the green development of iron and steel *** flue gas temperature of preheating(PH)section during grate-kiln iron ore pelletizing process typically ranges within 850–1050℃,which meets the temperature requirements of selective non-catalytic reduction(SNCR)for NO_(x).The in-bed SNCR behavior of NO_(x) in the PH section was investigated,and the influence of relevant parameters was *** show that with the flue gas temperature rising,the denitration rate reached a peak value and then declined,where the appropriate temperature range was 950–1000℃.Increasing the NH_(3)/NO ratio(NSR)contributed to improving the denitration rate,and the appropriate NSR was *** content in the flue gas also showed an important influence on denitration rate,which reached a peak value and then dropped with the oxygen content *** the condition of 18 vol.%oxygen content,the denitration reaction mainly occurred in the form of 4NO+4NH_(3)+O_(2)=4N_(2)+6H_(2)*** restricting the competitive reaction of NH_(3) oxidation,the oxygen content in flue gas of PH section should be kept at an appropriate *** general,the denitration rate reached about 25%in the PH section through spraying ammonia.

关键词： Iron ore pellet Grate-kiln process Flue gas Selective non-catalytic reduction denitration Denitration mechanism

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Preparation of sinter with low reduction degradation index for coREX reduction in a high proportion

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Journal of Iron and Steel Research international 2023年第4期30卷 635-649页

作者： Sheng-hu Lu Jian Pan Si-wei Li De-qing Zhu Zheng-qi Guo Yue Shi Ben-jing Shi School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina National engineering Research Center of Sintering and Pelletizing Equipment System Zhongye Changtian International Engineering Co.Ltd.Changsha 410205HunanChina

The sinter with low reduction degradation index(RDI)for coREX reduction was prepared by separated granulation sintering *** results illustrate that the productivity and tumble index are attained to be 1.64 t m^(-2)h^(-1)and 59.25%,respectively,in pot tests under the optimal *** the reducing condition simulating coREX shaft furnace,RDI_(+6.3 mm),RDI_(+3.15 mm),and reducibility index of the sinter reach 63.05%,81.52%,and 83.65%,*** with traditional sintering process,the productivity rose by 14.69%,and RDI_(+6.3) mm and RDI_(+3.15) mm were increased by 157.54%and 32.70%,*** addition,as the proportion of sinter reached 60%,RDI_(+6.3 mm)and RDI_(+3.15 mm)of comprehensive burden were achieved to be 73.39%and 84.28%,respectively,which could completely meet the requirement of coREX shaft furnace for *** mechanism was demonstrated that the more silicoferrites of calcium and aluminum and silicate phase occurred as well as magnetite,and the amount of Fe_(2)O_(3)decreased substantially in the sinter by separated granulation sintering ***,the low-temperature reducing stress is restrained,with the increase in sinter strength.

关键词： coREX Sintering Separated granulation Reduction degradation index comprehensive burden Microstructure

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Process control technology of low NO_x sintering based on coke pretreatment

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Journal of Central South University 2020年第2期27卷 469-477页

作者： WANG Zhao-cai ZHOU Zhi-an GAN Min FAN Xiao-hui HE Guo-qiang zhongye changtian international engineering co. Ltd.Changsha 410125China School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China

Process control is an effective approach to reduce the NOx emission from sintering flue *** effects of different materials adhered on coke breeze on NOx emission characteristics and sintering performance were *** showed that the coke breeze adhered with the mixture of CaO and Fe2O3 or calcium ferrite significantly lowers the NOx emission concentration and conversion ratio of fuel-N to *** the coke with the mixture of lime slurry and iron ore fines helped to improve the granulation effect,and optimize the carbon distribution in *** the mass ratio of coke breeze,quick lime,water and iron ore fines was 2:1:1:1,the average NOx emission concentration was decreased from 220 mg/m3 to 166 mg/m3,and the conversion ratio of fuel-N was reduced from 54.2%to 40.9%.

关键词： iron ore sintering nitrogen oxide process control coke breeze pretreatment

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Reducing process of sinter in coREX shaft furnace and influence of sinter proportion on reduction properties of composite burden

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Journal of Central South University 2021年第3期28卷 690-698页

作者： SHI Ben-jing ZHU De-qing PAN Jian HU Bing WANG Zhao-cai zhongye changtian international engineering co. Ltd.Changsha 410205China Process Research Institute National Engineering Research Center of Sintering and Pelletizing Equipment SystemChangsha 410205China Key Laboratory of Hunan Province for the Synergetic control and Resource Reuse of the Multi-Pollutants of Flue Gas Changsha 410205China School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China

In order to reduce the materials cost of coREX ironmaking process,sinter has been introduced into the composite burden in *** work explored the reducing process of sinter in coREX shaft furnace to clarify its reduction properties change and then the effect of sinter proportion on metallurgical performance of composite burden was *** results show that the reducing process of sinter in coREX shaft furnace was basically same with that in blast furnace but sinter seems like breaking *** reducing condition simulated coREX shaft furnace,sinter possessed the worst reduction degradation index(RDI)and undifferentiated reduction index(RI)compared with pellet and iron ore *** and microscopic mineralogy changes indicated that sinter presents integral cracking while pellet and lump ore present surface cracking,and no simple congruent relationship exists between cracks of the burden and its ultimate reduction degradation *** existence of partial metallurgical performance superposition between composite and single ferrous burden was ***_(+6.3)≥70%and RDI_(+3.15)≥80%were speculated as essential requirements for the composite burden containing sinter in coREX shaft furnace.

关键词： sinter coREX shaft furnace reducing process composite burden reduction degradation index(RDI) metallurgical performance

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