The clay mineral flocculation encapsulation poses a major technical challenge in the field of fine mineral separation.Enhancing the ability to separate clay minerals from target mineral surfaces is key to addressing t...The clay mineral flocculation encapsulation poses a major technical challenge in the field of fine mineral separation.Enhancing the ability to separate clay minerals from target mineral surfaces is key to addressing this issue.In the flotation process of ultrafine hematite,sodium polyacrylate(PAAS)was used as a selective flocculant for hematite,polyaluminum chloride(PAC)as a flocculant for kaolinite and chlorite,and sodium oleate(NaOL)as the collector to achieve asynchronous flocculation flotation.This study examines the flotation separation performance and validates it through experiments on actual mineral samples.The results indicate that with PAAS and PAC dosages of 1.25 and 50 mg·L^(-1),respectively,the iron grade and recovery of the actual mineral samples increased by 9.39%and 7.97%.Through Zeta potential,XPS analysis,infrared spectroscopy,and total organic carbon(TOC)testing,the study reveals the microscopic interaction mechanisms of different flocculants with minerals,providing insights for the clean and efficient utilization of ultrafine mineral resources.展开更多
The innovative application of choline chloride and para-toluenesulfonic acid(ChCl-pTSA)as a novel leaching agent for zinc(Zn)-containing dust sludge was investigated.The selective Zn leaching mechanism of the dust slu...The innovative application of choline chloride and para-toluenesulfonic acid(ChCl-pTSA)as a novel leaching agent for zinc(Zn)-containing dust sludge was investigated.The selective Zn leaching mechanism of the dust sludge was revealed using Fourier-transform infrared and X-ray photoelectron spectroscopy(XPS)and verified using molecular dynamics simulations.The leaching results showed that under conditions of a liquid-to-solid ratio of 8:1,leaching time of 15 min,and leaching temperature of 40℃,the leaching rate of Zn,Fe,and Al was 92.15%,17.34%,and 6.14%,respectively,indicating that ChCl-pTSA was selective for leaching Zn from Zn-containing dust sludge.The results of infrared spectroscopy showed that the characteristic peaks of Fe_(2)O_(3) and Al_(2)O_(3) in the leaching slag did not change significantly.In contrast,the distinctive peaks of ZnO gradually weakened and blue-shifted.The characteristic peaks of zinc in the leaching solution appeared at 480.66 and 1433.45 cm^(-1),indicating that the leaching of ZnO by ChCl-pTSA was mainly based on chemical interactions.On the other hand,the physical interactions of ChCl-pTSA with Fe_(2)O_(3) and Al_(2)O_(3) were dominant.XPS analysis showed that,in comparison to the zinc-containing dust,the characteristic peak orbitals of Zn in the leaching residue shifted,the characteristic peak area decreased,and the binding energy was reduced.In contrast,the characteristic peak areas of Fe and Al orbitals remained unchanged and did not undergo any apparent shifts.Molecular dynamics simulations showed that Zn mainly interacted with Cl and S=O in the ChCl-pTSA ionic liquid via chemisorption during the leaching process.Simultaneously,the hydrogen-bonding interactions between the choline cations and Fe,Al dominated.It was further shown that ChCl-pTSA has high selectivity for the leaching of ZnO from Zn-containing dust sludge.展开更多
基金funded by the National Natural Science Foundation of China(No.52374265)the Central Guided Local Science and Technology Development Funding Program(No.236Z4106G)+1 种基金the Natural Science Foundation of Hebei Province(No.E2022209108)Key Projects of Hebei Provincial Department of Education(No.ZD2022059)。
文摘The clay mineral flocculation encapsulation poses a major technical challenge in the field of fine mineral separation.Enhancing the ability to separate clay minerals from target mineral surfaces is key to addressing this issue.In the flotation process of ultrafine hematite,sodium polyacrylate(PAAS)was used as a selective flocculant for hematite,polyaluminum chloride(PAC)as a flocculant for kaolinite and chlorite,and sodium oleate(NaOL)as the collector to achieve asynchronous flocculation flotation.This study examines the flotation separation performance and validates it through experiments on actual mineral samples.The results indicate that with PAAS and PAC dosages of 1.25 and 50 mg·L^(-1),respectively,the iron grade and recovery of the actual mineral samples increased by 9.39%and 7.97%.Through Zeta potential,XPS analysis,infrared spectroscopy,and total organic carbon(TOC)testing,the study reveals the microscopic interaction mechanisms of different flocculants with minerals,providing insights for the clean and efficient utilization of ultrafine mineral resources.
基金supported by the Key Project of the Department of Education of Hebei Province(No.ZD2022059)Hebei Provincial Basic Research Business Fee Research Project for Provincial Universities(No.JQN2023010)
文摘The innovative application of choline chloride and para-toluenesulfonic acid(ChCl-pTSA)as a novel leaching agent for zinc(Zn)-containing dust sludge was investigated.The selective Zn leaching mechanism of the dust sludge was revealed using Fourier-transform infrared and X-ray photoelectron spectroscopy(XPS)and verified using molecular dynamics simulations.The leaching results showed that under conditions of a liquid-to-solid ratio of 8:1,leaching time of 15 min,and leaching temperature of 40℃,the leaching rate of Zn,Fe,and Al was 92.15%,17.34%,and 6.14%,respectively,indicating that ChCl-pTSA was selective for leaching Zn from Zn-containing dust sludge.The results of infrared spectroscopy showed that the characteristic peaks of Fe_(2)O_(3) and Al_(2)O_(3) in the leaching slag did not change significantly.In contrast,the distinctive peaks of ZnO gradually weakened and blue-shifted.The characteristic peaks of zinc in the leaching solution appeared at 480.66 and 1433.45 cm^(-1),indicating that the leaching of ZnO by ChCl-pTSA was mainly based on chemical interactions.On the other hand,the physical interactions of ChCl-pTSA with Fe_(2)O_(3) and Al_(2)O_(3) were dominant.XPS analysis showed that,in comparison to the zinc-containing dust,the characteristic peak orbitals of Zn in the leaching residue shifted,the characteristic peak area decreased,and the binding energy was reduced.In contrast,the characteristic peak areas of Fe and Al orbitals remained unchanged and did not undergo any apparent shifts.Molecular dynamics simulations showed that Zn mainly interacted with Cl and S=O in the ChCl-pTSA ionic liquid via chemisorption during the leaching process.Simultaneously,the hydrogen-bonding interactions between the choline cations and Fe,Al dominated.It was further shown that ChCl-pTSA has high selectivity for the leaching of ZnO from Zn-containing dust sludge.
