The presence forms of sulfur in High-sulfur petroleum coke and high temperature transfer was studied in this paper. It was found that a part of sulfur escape in the form of gaseous compounds through heating coke without air. The present structure of sulfide is inferred to be thiophene according to XPS spectra. The scientific calculation for amount of high sulfur petroleum coke can be continued according to the sulfur content of petroleum coke, sulfur transfer agent and permissible content of sulfur in the coke. The gaseous sulfur caused by the high sulfur petroleum coke which is directly used as boiler fuel and coal blending can be recycled through the original sulfur purification recovery system, meanwhile, the purification load rises.
Lithium-sulfur batteries potentially offer very high specific energies and are therefore candidates for future generation energy storage in various mobile applications. However, multiple challenges regarding the material design of different cell components need to be overcome. Among them, the low conductivity of sulfur requires the design of new carbon materials for contacting and stabilizing the active component. Here, we introduce vertical aligned carbon nanotube / sulfur nanocomposite electrodes as cathodes with very high capacity.
The distribution of sulfur forms in the products of low temperature pyrolysis of Carboniferous high sulfur coal from Northwest China was investigated. The typical method of Gray-King assay was used to carry out the low temperature pyrolysis experiments. GC-MS analysis was used to investigate the composition of sulfur compounds in the coal tar. The results show that sulfur mainly remained in the semi-coke and accounted for 80.97% of the total sulfur. Pyrites decomposed and transformed into sulfates and organic sulfur. 5 sulfur containing compounds were detected in the coal tar and they are dibenzothiophene, benzonaphthothiophene and their substituted homologs.
The high sulfur coal from Shanxi total sulfur content of 2.76%, in which pyritic sulfur content of 2.58% and sulfate sulfur content of 0.08% and organic sulfur content of 0.10%. In this paper, the Thiobacillus ferrooxidans separated by National Engineering Laboratory of Biohydrometallurgy was used to remove sulfur in the coal. The desulfurization rate under different grinding grain, pulp density and inoculation amount conditions were researched. The results showed that under the condition of grinding particle size of-0.074mm for 60%, the pulp density was 15% and inoculation amount was 15%, after 15 days' reaction, a yield of 98.54% product is achieved. Compared with original sample, the total sulfur content decreased from 2.76% to 0.32%, the pyritic sulfur content decreased from 2.58% to 0.16%. The total sulfur removal rate was 88.58% and pyritic sulfur removal rate was 93.89%. However, sulfate sulfur and organic sulfur were barely removed by Thiobacillus ferrooxidans.
The ore belongs to a kind of refractory gold ore cotaining arsenic and high-sulfur, contains high-sulfur and low-gold, and arsenopyrite is the main host mineral for Au. Because the floating gold fine with arsenic from sulfur floatation, lead to high content of arsenic in sulfur concentrate. This part of the gold loss in the sulfur concentrate. By optimizing the structure of floatation flow and using the new inhabitor LY100 for arsenic, the indexes of small-scale closed circuit test were obtained: the sulfur concentrate grading at 48.78% with a recovery of 44.76% and with As 0.47%, the arsenic concertrate grading at 15.95% with a recovery of 75.14%.
A study of gaseous sulfur dioxide detection in air by Laser Induced Breakdown Spectroscopy(LIBS) is reported. Plasmas were formed in the sulfur dioxide gas, and three lines of sulfur at 560.61nm, 567.77nm and 565.99nm were observed. We found that the most appropriate experimental conditions for LIBS detection on sulfur dioxide gas are: Laser PulseEnergy =100mJ, Gate Time Delay = 2us. A further study was made in detecting sulfur dioxide gas of different concentrations by LIBS. Finally we calculated the detection limit of sulfur dioxide gas is 330ppm.
Nonlinear refractive indices of novel sulfur copolymers are reported for the first time using a Z-scan setup. These values show a high nonlinearity compared to silica, demonstrating their potential for nonlinear optical applications.
Biological sulfite reduction was studied in a laboratory-scale anaerobic biotrickling reactor packed with ceramic granule for biomass attachment. Inoculated with the Sulfate-reducing Bacteria isolated from landfill leachate, the reactor was operated for 72h per cycle at room temperature with a sulfite loading rate of 1360 mg/L. The sulfite removal efficiency reached 97% after 9.5h. However, the total sulfur and Chemical Oxygen Demand (COD) reduction were 40% and 48.2% respectively at that time. To quantify various sulfur speciations, calculation of sulfur balance was performed, which revealed that up to 76% of sulfite removed was converted to elemental sulfur. In addition, the Oxidation-reduction potential (ORP) maintained within the range of -61 my to -20mv, which is different from the widely reported value: lower than -100mv. It is effective to treat sulfur-contining waste water using biotrckling reactor.
Dehydrogenated polyacrylonitrile (S/DPAN composite) is a promising cathode for lithium-sulfur (Li- S) batteries. This cathode exhibits higher specific discharge capacity and better cyclability in comparison with sulfur/carbon system 1-3]. Nonetheless, capacity fading still can be observed. Understanding the reasons for capacity fading is essential for designing a better cathode composite. In this study, characterization techniques such as scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), elemental analysis (CHNS) and electrochemical impedance spectroscopy (EIS) were used to investigate the change of cathode properties with cycle number.
A procedure to quantify volatile, organic sulfur compounds in gasoline was developed using solid-phase microextraction to preconcentrate the analyses followed by GC and detection with a sulfur chemiluminescence detector (SCD). The effects of temperature, time and PDMS fibers types on the extraction of gasoline has been investigated. The results show that a range of sulfur compounds were identified in gasoline. 75um PDMS, 30min, and 50°C were the optimum extraction conditions. Using the developed method can be used to identify gasoline residues in the fire.