In this study,a synergistic sulfidation-acid leaching process was proposed to recover valuable metals from gypsum residue and zinc-containing fume.The equilibrium phase composition of the sulfidation reaction and calc...In this study,a synergistic sulfidation-acid leaching process was proposed to recover valuable metals from gypsum residue and zinc-containing fume.The equilibrium phase composition of the sulfidation reaction and calculations of the thermodynamic stability region show that 89.36%Zn,>99%Pb and>99%Cu of gypsum residue and zinc-containing fume can be sulfured to ZnS,PbS and Cu 2 S,under sufficient sulfur partial pressure,low oxygen partial pressure and 400-1000℃.Sulfidation roasting experiments show that the sulfidation rate of Cu,Pb and Zn reach 81.43%,88.25% and 92.31%,respectively,under the roasting conditions of material mass ratio of 30 g:10 g,carbon dosage of 3.75 g,roasting temperature of 800℃ for 3 h.E−pH plots show that ZnS,PbS and Cu_(2)S can be enriched in the leaching residue,under leaching conditions at 25℃,pH<4 and-0.4 V<φ(E)<0.04 V.The leaching experiments showed that the sulfide is retained in the leaching residue,while the leaching rates of Cu,Pb and Zn are 1.94%,2.05% and 1.51%,respectively,under the conditions of 25℃,C_(HCl) of 0.5 mol/L,L/S of 5 mL/g,stirring rate of 300 r/min,and stirring time of 30 min.This study provides a new approach for the synergistic disposal of gypsum residue and zinc containing fume.展开更多
The zinc-containing dust was oxidatively pretreated with calcium hypochlorite,subsequently leached with ammonia/ammonium bicarbonate solution to obtain the ammoniacal leaching solution,and zinc oxide was produced by a...The zinc-containing dust was oxidatively pretreated with calcium hypochlorite,subsequently leached with ammonia/ammonium bicarbonate solution to obtain the ammoniacal leaching solution,and zinc oxide was produced by ammonia distillation of the ammoniacal leaching solution and subsequent calcination. The elements of iron and manganese could not be detected in ammoniacal leaching solution,and the extraction rate of zinc was 98.2% in ammoniacal leaching process. The zinc oxide content in the product is 99.5%(ω),and the contents of iron and manganese in the product were 0.002 8‰ and 0.000 84‰(ω), respectively. The analyses of the valence states of iron and manganese in the zinc-containing dust with and without pretreatment were performed by chemical analysis and XPS,and the possible oxidation mechanism of the oxidative pretreatment of the dust was discussed. It is concluded that Fe 2+-oxide and Mn 2+-oxide in the dust were oxidized to Fe 3+-oxide and/or its hydrate and Mn 4+-oxide and/or its hydrate by calcium hypochlorite during the oxidative pretreatment process,respectively.展开更多
The title compound {Cs2[Zn(S2C=C(CN)2)2]}n(2),Catena-poly {dicesium [bis(l,l-dicyanoethene-2,2-dithiolato-S,S':N)-Zinc(Ⅱ)]},is the second example of bridging [S2C=C(CN)2] (hereafter referred to as i-mnt) for meta...The title compound {Cs2[Zn(S2C=C(CN)2)2]}n(2),Catena-poly {dicesium [bis(l,l-dicyanoethene-2,2-dithiolato-S,S':N)-Zinc(Ⅱ)]},is the second example of bridging [S2C=C(CN)2] (hereafter referred to as i-mnt) for metal-containing polymer.It crystallizes in the non-centrosymmetric space group Ia (alt.Cc,No.9).There are two coordination modes of i-mnt in this compound:μ-η1-η1-i-mnt,bridging two Zn moieties with two S atoms and terminal i-mnt.A characteristic feature of the structure is the infinite-Zn(η2-i-mnt)(η1-η1-i-mnt)-Zn(η1-η1-i-mnt)(η2-i-mnt)-wave-like chain.Cs atoms are located between the chains to form three-dimensional network-like packing.An efficient second harmonic generation from the crystal has been observed on the irradiation with the 1064 nm output of a Nd:YAG laser.展开更多
Co-carbonization of weakly caking coal and zinc-containing dust to prepare highly reactive ferro-coke and collaboratively recover zinc powder is one of the feasible ways for steel enterprises to recycle zinc-containin...Co-carbonization of weakly caking coal and zinc-containing dust to prepare highly reactive ferro-coke and collaboratively recover zinc powder is one of the feasible ways for steel enterprises to recycle zinc-containing dust.The pyrolysis mass loss behavior of adding blast furnace dust with different zinc contents to different ferro-coke materials was systematically studied by thermogravimetry and differential thermogravimetry analysis,and the kinetic mechanism of pyrolysis-reduction reaction of hybrid briquette was explored.The results of thermogravimetric curve analysis show that the addition of zinc oxide to the sample has no significant effect on the mass loss rate of the sample below 580℃,and the pyrolysis mass loss of zinc oxide mainly occurs between 800 and 1000℃.Kinetic analysis results show that the pyrolysis of zinc-containing samples is controlled by chemical reactions below 580℃.The reaction at 580–700℃ is controlled by the nucleation and growth model,and that above 700℃ is mainly controlled by diffusion.The results of X-ray diffraction analysis show that the pyrolysis process can effectively remove zinc oxide from ferro-coke.展开更多
An efficient approach for lead extraction from waste funnel glass through the lead smelting process has been proposed. To clarify the effect of funnel glass addition on the degradation of magnesia-chromite refractorie...An efficient approach for lead extraction from waste funnel glass through the lead smelting process has been proposed. To clarify the effect of funnel glass addition on the degradation of magnesia-chromite refractories by ZnO-containing fayalite slag, the corrosion behavior of magnesia-chromite refractories in lead smelting slags with different funnel glass additions from 0wt% to 40wt% was tested. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) was used to acquire the microstructural information of the worn refractory samples. Experimental results showed that the corrosion of magnesia-chromite refractory consisted predominantly of the dissolution of MgO into slag. ZnO and FeO reacted with periclase and chromite to form (Zn,Fe,Mg)O solid solution and (Zn,Fe,Mg)(Fe,Al,Cr)2O4 spinel, respectively. With the addition of funnel glass, the solubility of MgO increased whereas ZnO levels remained stable, thereby resulting in a reduced Mg content and an elevated Zn and Fe content in the (Zn,Fe,Mg)O solid solution and the (Zn,Fe,Mg)(Fe,Al,Cr)2O4 spinel. Considering the stability of the (Zn,Fe,Mg)O solid solution layer and the penetration depth of the slag, the optimal funnel glass addition for lead smelting was found to be 20wt%.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Projects(52174269,52374293)supported by the National Natural Science Foundation of ChinaProject(2022RC1123)supported by the Science and Technology Innovation Program of Hunan Province,China。
文摘In this study,a synergistic sulfidation-acid leaching process was proposed to recover valuable metals from gypsum residue and zinc-containing fume.The equilibrium phase composition of the sulfidation reaction and calculations of the thermodynamic stability region show that 89.36%Zn,>99%Pb and>99%Cu of gypsum residue and zinc-containing fume can be sulfured to ZnS,PbS and Cu 2 S,under sufficient sulfur partial pressure,low oxygen partial pressure and 400-1000℃.Sulfidation roasting experiments show that the sulfidation rate of Cu,Pb and Zn reach 81.43%,88.25% and 92.31%,respectively,under the roasting conditions of material mass ratio of 30 g:10 g,carbon dosage of 3.75 g,roasting temperature of 800℃ for 3 h.E−pH plots show that ZnS,PbS and Cu_(2)S can be enriched in the leaching residue,under leaching conditions at 25℃,pH<4 and-0.4 V<φ(E)<0.04 V.The leaching experiments showed that the sulfide is retained in the leaching residue,while the leaching rates of Cu,Pb and Zn are 1.94%,2.05% and 1.51%,respectively,under the conditions of 25℃,C_(HCl) of 0.5 mol/L,L/S of 5 mL/g,stirring rate of 300 r/min,and stirring time of 30 min.This study provides a new approach for the synergistic disposal of gypsum residue and zinc containing fume.
基金Supported by the National Basic Research Program of China(973)(No.2007CB613601)Supported by the National Natural Science Foundationof China(No.51134007)Supported by the Science&Technology Plan of Hunan Province(No.2011FJ6005)
文摘The zinc-containing dust was oxidatively pretreated with calcium hypochlorite,subsequently leached with ammonia/ammonium bicarbonate solution to obtain the ammoniacal leaching solution,and zinc oxide was produced by ammonia distillation of the ammoniacal leaching solution and subsequent calcination. The elements of iron and manganese could not be detected in ammoniacal leaching solution,and the extraction rate of zinc was 98.2% in ammoniacal leaching process. The zinc oxide content in the product is 99.5%(ω),and the contents of iron and manganese in the product were 0.002 8‰ and 0.000 84‰(ω), respectively. The analyses of the valence states of iron and manganese in the zinc-containing dust with and without pretreatment were performed by chemical analysis and XPS,and the possible oxidation mechanism of the oxidative pretreatment of the dust was discussed. It is concluded that Fe 2+-oxide and Mn 2+-oxide in the dust were oxidized to Fe 3+-oxide and/or its hydrate and Mn 4+-oxide and/or its hydrate by calcium hypochlorite during the oxidative pretreatment process,respectively.
基金Project supported by the National Natural Science Foundation of China
文摘The title compound {Cs2[Zn(S2C=C(CN)2)2]}n(2),Catena-poly {dicesium [bis(l,l-dicyanoethene-2,2-dithiolato-S,S':N)-Zinc(Ⅱ)]},is the second example of bridging [S2C=C(CN)2] (hereafter referred to as i-mnt) for metal-containing polymer.It crystallizes in the non-centrosymmetric space group Ia (alt.Cc,No.9).There are two coordination modes of i-mnt in this compound:μ-η1-η1-i-mnt,bridging two Zn moieties with two S atoms and terminal i-mnt.A characteristic feature of the structure is the infinite-Zn(η2-i-mnt)(η1-η1-i-mnt)-Zn(η1-η1-i-mnt)(η2-i-mnt)-wave-like chain.Cs atoms are located between the chains to form three-dimensional network-like packing.An efficient second harmonic generation from the crystal has been observed on the irradiation with the 1064 nm output of a Nd:YAG laser.
基金financially supported by the National Natural Science Foundation of China(No.52274316)the State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing(Nos.41620025,41620026,and 41621009)the Interdisciplinary Research Project for Young Teachers of University of Science and Technology Beijing(the Fundamental Research Funds for the Central Universities)(No.FRF-IDRY-20-014).
文摘Co-carbonization of weakly caking coal and zinc-containing dust to prepare highly reactive ferro-coke and collaboratively recover zinc powder is one of the feasible ways for steel enterprises to recycle zinc-containing dust.The pyrolysis mass loss behavior of adding blast furnace dust with different zinc contents to different ferro-coke materials was systematically studied by thermogravimetry and differential thermogravimetry analysis,and the kinetic mechanism of pyrolysis-reduction reaction of hybrid briquette was explored.The results of thermogravimetric curve analysis show that the addition of zinc oxide to the sample has no significant effect on the mass loss rate of the sample below 580℃,and the pyrolysis mass loss of zinc oxide mainly occurs between 800 and 1000℃.Kinetic analysis results show that the pyrolysis of zinc-containing samples is controlled by chemical reactions below 580℃.The reaction at 580–700℃ is controlled by the nucleation and growth model,and that above 700℃ is mainly controlled by diffusion.The results of X-ray diffraction analysis show that the pyrolysis process can effectively remove zinc oxide from ferro-coke.
基金financially supported by the National Key R&D Program of China (No. 2018YFC1902004)the National Natural Science Foundation of China (No. U1608254)+1 种基金the Project for Guangdong Collaborative Innovation and Platform Environment Building (No. 2017B090904035)the Special Project for Key Laboratory of Guangdong Science and Technology Department, China (No. 2017B030314046)
文摘An efficient approach for lead extraction from waste funnel glass through the lead smelting process has been proposed. To clarify the effect of funnel glass addition on the degradation of magnesia-chromite refractories by ZnO-containing fayalite slag, the corrosion behavior of magnesia-chromite refractories in lead smelting slags with different funnel glass additions from 0wt% to 40wt% was tested. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) was used to acquire the microstructural information of the worn refractory samples. Experimental results showed that the corrosion of magnesia-chromite refractory consisted predominantly of the dissolution of MgO into slag. ZnO and FeO reacted with periclase and chromite to form (Zn,Fe,Mg)O solid solution and (Zn,Fe,Mg)(Fe,Al,Cr)2O4 spinel, respectively. With the addition of funnel glass, the solubility of MgO increased whereas ZnO levels remained stable, thereby resulting in a reduced Mg content and an elevated Zn and Fe content in the (Zn,Fe,Mg)O solid solution and the (Zn,Fe,Mg)(Fe,Al,Cr)2O4 spinel. Considering the stability of the (Zn,Fe,Mg)O solid solution layer and the penetration depth of the slag, the optimal funnel glass addition for lead smelting was found to be 20wt%.
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.
