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Leaching kinetics of selenium from selenium-tellurium-rich materials in sodium sulfite solutions 被引量:18
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作者 郑雅杰 陈昆昆 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第2期536-543,共8页
The leaching kinetics of selenium from selenium-tellurium-rich materials in sodium sulfite solutions was studied. The morphologies of selenium-tellurium-rich materials are mainly spheroid and columnar bodies and the r... The leaching kinetics of selenium from selenium-tellurium-rich materials in sodium sulfite solutions was studied. The morphologies of selenium-tellurium-rich materials are mainly spheroid and columnar bodies and the range of particle size of selenium-tellurium-rich materials is between 17.77μm and 56.58μm, which contain 41.73%selenium and 40.96%tellurium. The ranges of experimental elements are 126-315 g/L of sodium sulfite concentration, 100-400 r/min of agitation speed, 23-95 ℃ of reaction temperature, 7:1-14:1 of liquid-solid ratio and 17.77-56.58μm of average particle size. The results show that the leaching rate increases with increasing the sodium sulfite concentration, agitation speed, reaction temperature or liquid-solid ratio and the leaching rate decreases with increasing the particle size. The reaction temperature has the significant effects on the selenium leaching rate which increases from 21%to 67%with increasing temperature from 23 ℃ to 95 ℃. The experimental data agree quite well with the Avrami model for leaching, with model parameter of 0.235 and apparent activation energy of 20.847 kJ/mol. 展开更多
关键词 SELENIUM TELLURIUM sodium sulfite leaching kinetics
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Electrochemical mechanism and flotation of chalcopyrite and galena in the presence of sodium silicate and sodium sulfite 被引量:17
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作者 Ye ZHANG Run-qing LIU +3 位作者 Wei SUN Li WANG Yan-hong DONG Chang-tao WANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第4期1091-1101,共11页
The electrochemical mechanism involved in the selective separation of chalcopyrite from galena was investigated by flotation and electrochemical methods in the presence of sodium sulfite and sodium silicate,respective... The electrochemical mechanism involved in the selective separation of chalcopyrite from galena was investigated by flotation and electrochemical methods in the presence of sodium sulfite and sodium silicate,respectively,as a single depressant and their mixture as a combined depressant.Flotation tests revealed that the floatability of chalcopyrite was unaffected by depressants and its recovery remained constant(>80%)within the studied dosage range.Galena flotation was severely depressed with descending depressing order as follows:combined depressant﹥sodium silicate﹥sodium sulfite.Electrochemical analysis confirmed the high affinity of depressants on the galena surface,resulting in the formation of hydrophilic species,such as lead sulfite,lead sulfate,and lead orthosilicate.The oxidation of chalcopyrite surface and depressants did not exhibit any signals;conversely,the self-oxidation of chalcopyrite was depressed.The results of cyclic voltammograms well agreed with flotation results,demonstrating that chalcopyrite primarily reacted with the collector O-isopropyl-N-ethyl thionocarbamate and that galena mostly reacted with depressants. 展开更多
关键词 flotation electrochemistry CHALCOPYRITE GALENA sodium sulfite sodium silicate
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The sulfinatodehalogenation of primary polyfluoroalkyl iodides by sodium sulfite
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作者 HUANG, Wei-Yuan WU, Fan-Hong HUANG, Bing-NanShanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China 《Chinese Journal of Chemistry》 SCIE CAS CSCD 1994年第6期549-551,共3页
Polyfluoroalkyl iodides, such as Cl(CF2)nI(n=4, 6, 8, 1b-1d) and F(CF2)nI (n=6, 8,1e-1f) reacted with sodium sulfite in neutral aqueous DMF solution to give the corresponding sulfinates Cl(CF2)nSO2Na (n=4, 6, 8, 2b-2d... Polyfluoroalkyl iodides, such as Cl(CF2)nI(n=4, 6, 8, 1b-1d) and F(CF2)nI (n=6, 8,1e-1f) reacted with sodium sulfite in neutral aqueous DMF solution to give the corresponding sulfinates Cl(CF2)nSO2Na (n=4, 6, 8, 2b-2d) and F(CF2)nSO2Na (n=6, 8, 2e-2f) in moderate yields. I(CF2)2O(CF2)2SO2F ( la ) reacted under the same condition to give 3-oxa-octafluoropentane-1,5-disulfinates (2a). 展开更多
关键词 SULFINATODEHALOGENATION polyfluoroalkanesulfinates sodium sulfite.
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Effect of Addition of Sodium Dodecyl Sulfite on Physical Properties of Wheat Gluten Films 被引量:1
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作者 曾瑜薇 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2005年第2期15-19,共5页
Films were made from the wheat glutens treated with 5%,10%,15%,20%,25% and 30%(wt% of gluten) of sodium dodecyl sulfite (SDS) in order to improve the properties of the films. Glycerol was used as a plasticizer.An addi... Films were made from the wheat glutens treated with 5%,10%,15%,20%,25% and 30%(wt% of gluten) of sodium dodecyl sulfite (SDS) in order to improve the properties of the films. Glycerol was used as a plasticizer.An addition of SDS in wheat glutens prior to forming films significantly increased the elongation at break(E) (P<0.05) and reduced notably the water vapor permeability(WVP) (P<0.05). In contrast,a decrease in the tensile strength(TS) of the films from gluten containing-SDS was found.Moreover,a significant decrease in P_(O_2) and P_(CO_2) of films from gluten treated with SDS was noticed. Although SDS-treated gluten film was slightly more yellow and darker than control one, it was not visually detrimental. It is indicated that the treatment with SDS prior to forming films greatly enhances the mechanical properties of wheat gluten films.The obivous improvement in water vapor permeability and extensibility of gluten films means that the use of SDS is a potential choice for improving properties of gluten films. The edible film was used to preserve tomatoes. The experimental results show that the shelf life of tomatoes coated with the edible film is extended, and the nutritional quality is kept well. 展开更多
关键词 wheat gluten sodium dodecyl sulfite (SDS) tensile strength (TS) elongation at break(E) water vapor permeability(WVP) tomato preservation
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Interaction mechanism of cyanide with pyrite during the cyanidation of pyrite and the decyanation of pyrite cyanide residues by chemical oxidation
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作者 Wenwen Han Hongying Yang Linlin Tong 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第9期1996-2005,共10页
The toxic cyanides in cyanide residues produced from cyanidation process for gold extraction are harmful to the environment.Pyrite is one of the main minerals existing in cyanide residues.In this work,the interaction ... The toxic cyanides in cyanide residues produced from cyanidation process for gold extraction are harmful to the environment.Pyrite is one of the main minerals existing in cyanide residues.In this work,the interaction of cyanide with pyrite and the decyanation of pyrite cyanide residue were analyzed.Results revealed that high pH value,high cyanide concentration,and high pyrite dosage promoted the interaction of cyanide with pyrite.The cyanidation of pyrite was pseudo-second-order with respect to cyanide.The decyanation of pyrite cyanide residue by Na_(2)SO_(3)/air oxidation was performed.The cyanide removal efficiency was 83.9% after 1 h of reaction time under the optimal conditions of pH value of 11.2,SO_(3)^(2-) dosage of 22 mg·g^(-1),and air flow rate of 1.46 L·min^(-1).X-ray photoelectron spectroscopy analysis of the pyrite samples showed the formation of Fe(Ⅲ)and FeSO_(4) during the cyanidation process.The cyanide that adsorbed on the pyrite surface after cyanidation mainly existed in the forms of free cyanide(CN^(-))and ferrocyanide(Fe(CN)_(6)^(4-)),which were effectively removed by Na_(2)SO_(3)/air oxidation.During the decyanation process,air intake promoted pyrite oxidation and weakened cyanide adsorption on the pyrite surface.This study has practical significance for gold enterprises aiming to mitigate the environmental impact related to cyanide residues. 展开更多
关键词 PYRITE CYANIDE DECYANATION sodium sulfite/air oxidation cyanide residue
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Oxidation inhibition of sulfite in dual alkali flue gas desulfurization system 被引量:25
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作者 MO Jian-song WU Zhong-biao +2 位作者 CHENG Chang-jie GUAN Bao-hong ZHAO Wei-rong 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2007年第2期226-231,共6页
A laboratory-scale well-mixed thermostatic reactor with continuously blasting air was used to investigate the oxidation inhibition of sulfite in dual alkali flue gas desulfurization (FGD) system. The effects of oper... A laboratory-scale well-mixed thermostatic reactor with continuously blasting air was used to investigate the oxidation inhibition of sulfite in dual alkali flue gas desulfurization (FGD) system. The effects of operating parameters such as pH value and catalyst concentration on the oxidation were studied. Sodium thiosulfate was used in the system, and was found that it significantly inhabited the sulfite oxidation. In the absence of catalyst, sodium thiosulfate at 12.67 mmol/L had an inhibition efficiency of approximately 98%. While in the presence of catalyst, sodium thiosulfate at 26.72 mmol/L had an inhibition efficiency less than 85.0%. The oxidation reaction order of sulfite in the sodium thiosulfate was determined to be -1.90 and 4).55 in the absence and presence of the catalyst, respectively. Apparent activation energy of oxidation inhibition was calculated to be 53.9 kJ/mol. Pilot tests showed that the consumption rate of thiosulfate agreed well with the laboratory-scale experimental results. 展开更多
关键词 dual alkali sodium sulfite oxidation inhibition sodium thiosulfate
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A new sulfur-doped source and synergistic effect with nitrogen for carbon dots produced from glucose
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作者 Lige Fu Yuehong Yin +5 位作者 Guohua Cao Pingping Wu Jian Wang Lingling Yan Baoqing Zhang Ming Li 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第12期345-351,共7页
The nitrogen and sulfur co-doped carbon dots(N, S-CDs) with increased luminescence were synthesized by a hydrothermal process in one green pot by using glucose, and a new sulfur-doping source of sodium sulfite was dev... The nitrogen and sulfur co-doped carbon dots(N, S-CDs) with increased luminescence were synthesized by a hydrothermal process in one green pot by using glucose, and a new sulfur-doping source of sodium sulfite was developed.The synergistic effect of the N and S groups was well discussed through the structure analysis of Fourier transform infrared spectra and x-ray photoelectron spectra. The surface states of N, S-CDs embody more complicated functional groups, and S element exists as –SSO3, –C–SO3, and SO-42groups due to the introduction of sodium sulfite. The sulfur-containing groups passivate the surface of the CDs, and the relatively high sulfur groups may reduce the non-radiation centers. The fluorescence is affected by the hydroxyl group of the solvent. The quenching of Fe3+ ion to fluorescence and the sensitivity of fluorescence to p H were also investigated. 展开更多
关键词 carbon dots GLUCOSE sodium sulfite nitrogen and sulfur codoping synergistic effect
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Influence of sulfur doping on the molecular fluorophore and synergistic effect for citric acid carbon dots
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作者 Guohua Cao Zhifei Wei +4 位作者 Yuehong Yin Lige Fu Yukun Liu Shengli Qiu Baoqing Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第9期534-541,共8页
In citric acid-based carbon dots,molecular fluorophore contributes greatly to the fluorescence emission.In this paper,the nitrogen and sulfur co-doped carbon dots(N,S-CDs)were prepared,and an independent sulfur source... In citric acid-based carbon dots,molecular fluorophore contributes greatly to the fluorescence emission.In this paper,the nitrogen and sulfur co-doped carbon dots(N,S-CDs)were prepared,and an independent sulfur source is selected to achieve the doping controllability.The influence of sulfur doping on the molecular fluorophore was systematically studied.The introduction of sulfur atoms may promote the formation of molecular fluorophore due to the increased nitrogen content in CDs.The addition surface states containing sulfur were produced,and S element exists as-SO_(3),and-SO_(4)groups.Appreciate ratio of nitrogen and sulfur sources can improve the fluorescence emission.The photoluminescence quantum yields(PLQY)is increased from 56.4%of the single N-doping CDs to 63.4%of double-doping CDs,which ascribes to the synergistic effect of molecular fluorophores and surface states.The sensitivity of fluorescence to pH response and various metal ions was also explored. 展开更多
关键词 carbon dots citric acid sodium sulfite molecular fluorophore synergistic effect
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A new preparation method of gold nanoparticles by intra-reduction of sodium gold(Ⅰ) sulfite 被引量:1
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作者 Wu-Yang Nie Le Li +1 位作者 De-Liang Li Xi Liu 《Chinese Chemical Letters》 SCIE CAS CSCD 2014年第2期380-382,共3页
In this study, well-dispersed gold nanoparticles were prepared by using intra-molecular reduction of sodium gold sulfite, without using additional reductants and chloride free. The technical parameters including trans... In this study, well-dispersed gold nanoparticles were prepared by using intra-molecular reduction of sodium gold sulfite, without using additional reductants and chloride free. The technical parameters including transformation temperature, pH, and concentration were optimized by the single-factor method as 90 C, pH 1, and 0.01 mmol/L [Na3Au(SO3)2], respectively. The resultant colloidal transmission electron microscopy images (TEM) and UV-vis absorption spectrophotometer spectra were acquired to check their properties, and the results show this kind of colloidal gold is controlled to 6 nm in sizes and has good stability in solution. 展开更多
关键词 Colloidal gold sodium gold(I) sulfite Intra-reduction
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Advantage of selective production of green rusts for Sb(Ⅴ) removal in Fe(0) electrocoagulation
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作者 Di Cao Meng Qiao +2 位作者 Angzhen Li Jingwei Hao Xu Zhao 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第10期2779-2783,共5页
The re moval efficiency of pollutants in Fe(O) electrocoagulation(EC) has been associated closely with the speciation of generated Fe(Ⅱ)/Fe(Ⅲ) oxides during this process,which is very complicated and can be affected... The re moval efficiency of pollutants in Fe(O) electrocoagulation(EC) has been associated closely with the speciation of generated Fe(Ⅱ)/Fe(Ⅲ) oxides during this process,which is very complicated and can be affected by various factors.In this work,in-situ Raman,X-ray diffraction and some other techniques have been used to study the speciation of Fe under different conditions and to establish a relationship between Fe speciation and Sb(V) removal efficiency.Results indicated that concentration of dissolved oxygen(DO)is a key factor influencing Fe(O) EC.It was found that green rusts(GRs) were formed and were then transformed into magnetite at lower DO concentration,and Sb(V) removal efficiency reached 99.9% after30 min of EC.In contrast,γ-FeOOH was formed at high DO concentration,and the removal efficiency of Sb(V) after 30 min of EC was only 72.8%.In the presence of sulfite and phosphate with low concentrations,GRs can be stabilized and benefit the removal of Sb(V).We believe this work will provide some new insights on the mechanism of Fe(O) EC and the effective removal of other pollutants during Fe(O)EC process. 展开更多
关键词 Iron electrocoagulation ANTIMONY Green rusts sodium sulfite PHOSPHATE
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