NA novel smelting reduction process based on FeO-SiO2-Al2O3 slag system for spent lithium ion batteries with Al cans was developed, while using copper slag as the only slag former. The feasibility of the process and t...NA novel smelting reduction process based on FeO-SiO2-Al2O3 slag system for spent lithium ion batteries with Al cans was developed, while using copper slag as the only slag former. The feasibility of the process and the mechanism of copper loss in slag were investigated. 98.83% Co, 98.39% Ni and 93.57% Cu were recovered under the optimum conditions of slag former/battery mass ratio of 4.0：1, smelting temperature of 1723 K, and smelting mass ratio of time of 30 min. The FeO-SiO2-Al2O3 slag system for the smelting process is appropriate under the conditions of m（FeO）：m（SiO2）=0.58：1？1.03：1, and 17.19%？21.52% Al2O3 content. The obtained alloy was mainly composed of Fe-Co-Cu-Ni solid solution including small amounts of matte. The obtained slag mainly consisted of fayalite and hercynite. Meanwhile, the mechanism of copper loss is the mechanical entrainment from strip-like fayalite particles in the main form of copper sulfide and metallic copper.展开更多
A lot of iron-bearing slags were produced,and whose grade is much more than that of industrial iron ore grade.Chemical analysis and phase identification shows that the iron-bearing slag is amorphous,has fayalite main ...A lot of iron-bearing slags were produced,and whose grade is much more than that of industrial iron ore grade.Chemical analysis and phase identification shows that the iron-bearing slag is amorphous,has fayalite main phase,iron grade is 36.10%,and is difficult to recover iron from the slag.Thermodynamic calculation indicates that CO cannot reduce fayalite at high temperature and carbon direct reduction can be effective.Moreover,the reaction begins at 770 ℃ and the temperature can be reduced down to 500℃ when CaO is added.On this basis,a method is put forward to making direct enrichment of iron by taking carbon contained pellets to realize the rapid reduction of fayalite,and the direct reduction process were studied in this paper.Experiments show that xC/xO should be less than 1.5 for the need of reduction and carburization,and CaO and Al2O3 can spur the reduction of fayalite.On conditions that xC/xO is 1.2,metallization rate can be 77% when temperature is 1 250 ℃ and only carbon is added,and metallization rate can be 74% when temperature is 1 200 ℃ and only CaO is added.Moreover the addition of Al2O3 can get a higher metallization rate（10% or so） than usual as R is between 0.4 and 1.0.Under the optimized condition of R equals to 0.6,temperature of 1 250 ℃,slag melting point of 1 320 ℃,and time of 30 min,the metallization rate can reach 88.43%.展开更多
Water-quenched copper-nickel metallurgical slag enriched with olivine minerals exhibits promising potential for the production of CO_(2)-mineralized cementitious materials.In this work,copper-nickel slag-based cementi...Water-quenched copper-nickel metallurgical slag enriched with olivine minerals exhibits promising potential for the production of CO_(2)-mineralized cementitious materials.In this work,copper-nickel slag-based cementitious material(CNCM)was synthesized by using different chemical activation methods to enhance its hydration reactivity and CO_(2) mineralization capacity.Different water curing ages and carbonation conditions were explored related to their carbonation and mechanical properties development.Meanwhile,thermogravimetry differential scanning calorimetry and X-ray diffraction methods were applied to evaluate the CO_(2) adsorption amount and carbonation products of CNCM.Microstructure development of carbonated CNCM blocks was examined by backscattered electron imaging(BSE)with energy-dispersive X-ray spectrometry.Results showed that among the studied samples,the CNCM sample that was subjected to water curing for 3 d exhibited the highest CO_(2) sequestration amount of 8.51wt%at 80℃and 72 h while presenting the compressive strength of 39.07 MPa.This result indicated that 1 t of this CNCM can sequester 85.1 kg of CO_(2) and exhibit high compressive strength.Although the addition of citric acid did not improve strength development,it was beneficial to increase the CO_(2) diffusion and adsorption amount under the same carbonation conditions from BSE results.This work provides guidance for synthesizing CO_(2)-mineralized cementitious materials using large amounts of metallurgical slags containing olivine minerals.展开更多
基金Project(JS-211)supported by the State-Owned Enterprise Electric Vehicle Industry Alliance,China
文摘NA novel smelting reduction process based on FeO-SiO2-Al2O3 slag system for spent lithium ion batteries with Al cans was developed, while using copper slag as the only slag former. The feasibility of the process and the mechanism of copper loss in slag were investigated. 98.83% Co, 98.39% Ni and 93.57% Cu were recovered under the optimum conditions of slag former/battery mass ratio of 4.0：1, smelting temperature of 1723 K, and smelting mass ratio of time of 30 min. The FeO-SiO2-Al2O3 slag system for the smelting process is appropriate under the conditions of m（FeO）：m（SiO2）=0.58：1？1.03：1, and 17.19%？21.52% Al2O3 content. The obtained alloy was mainly composed of Fe-Co-Cu-Ni solid solution including small amounts of matte. The obtained slag mainly consisted of fayalite and hercynite. Meanwhile, the mechanism of copper loss is the mechanical entrainment from strip-like fayalite particles in the main form of copper sulfide and metallic copper.
基金Item Sponsored by National Science and Technology Support Program for 11th Five-Year Plan of China(2009BAB45B05)
文摘A lot of iron-bearing slags were produced,and whose grade is much more than that of industrial iron ore grade.Chemical analysis and phase identification shows that the iron-bearing slag is amorphous,has fayalite main phase,iron grade is 36.10%,and is difficult to recover iron from the slag.Thermodynamic calculation indicates that CO cannot reduce fayalite at high temperature and carbon direct reduction can be effective.Moreover,the reaction begins at 770 ℃ and the temperature can be reduced down to 500℃ when CaO is added.On this basis,a method is put forward to making direct enrichment of iron by taking carbon contained pellets to realize the rapid reduction of fayalite,and the direct reduction process were studied in this paper.Experiments show that xC/xO should be less than 1.5 for the need of reduction and carburization,and CaO and Al2O3 can spur the reduction of fayalite.On conditions that xC/xO is 1.2,metallization rate can be 77% when temperature is 1 250 ℃ and only carbon is added,and metallization rate can be 74% when temperature is 1 200 ℃ and only CaO is added.Moreover the addition of Al2O3 can get a higher metallization rate（10% or so） than usual as R is between 0.4 and 1.0.Under the optimized condition of R equals to 0.6,temperature of 1 250 ℃,slag melting point of 1 320 ℃,and time of 30 min,the metallization rate can reach 88.43%.
基金supported by the Intergovernmental International Science and Technology Innovation Cooperation Key Project of the National Key Research and Development Program of China (No.2022YFE0135100)the National Natural Science Foundation of China (No.52072171)+1 种基金the Beijing Nova Program (No.20220484057)the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
文摘Water-quenched copper-nickel metallurgical slag enriched with olivine minerals exhibits promising potential for the production of CO_(2)-mineralized cementitious materials.In this work,copper-nickel slag-based cementitious material(CNCM)was synthesized by using different chemical activation methods to enhance its hydration reactivity and CO_(2) mineralization capacity.Different water curing ages and carbonation conditions were explored related to their carbonation and mechanical properties development.Meanwhile,thermogravimetry differential scanning calorimetry and X-ray diffraction methods were applied to evaluate the CO_(2) adsorption amount and carbonation products of CNCM.Microstructure development of carbonated CNCM blocks was examined by backscattered electron imaging(BSE)with energy-dispersive X-ray spectrometry.Results showed that among the studied samples,the CNCM sample that was subjected to water curing for 3 d exhibited the highest CO_(2) sequestration amount of 8.51wt%at 80℃and 72 h while presenting the compressive strength of 39.07 MPa.This result indicated that 1 t of this CNCM can sequester 85.1 kg of CO_(2) and exhibit high compressive strength.Although the addition of citric acid did not improve strength development,it was beneficial to increase the CO_(2) diffusion and adsorption amount under the same carbonation conditions from BSE results.This work provides guidance for synthesizing CO_(2)-mineralized cementitious materials using large amounts of metallurgical slags containing olivine minerals.
