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Process gases are high temperature by-products of many processes in copper metallurgy. They are heavily dusted and contain combustible components. The basic element in its treatment system is a post combustion chamber localized directly behind the technological furnace. This chamber permits combusting combustible components and precooling the gases with the aid of cooling water and air. Analysis of...
Microwave heating has been widely accepted in accelerating chemical reactions. A microwave-induced hydrothermal reaction was developed and tested for its effectiveness in the decomposition of polychlorinated biphenyls (PCBs) in this study. Three simple reactants participated in the microwave-induced hydrothermal reaction, namely iron powder, NaOH and H2O. Under microwave heating, NaOH and H2O absorbed...
In the paper, the quality of the mixed waste water with fresh water in low permeability reservoirs is analyzed. It is found out that the sediment components of the mixed waste water with fresh water are mainly CaSO4. Except for the pH value, the oil, suspend-solids, total Fe content of the mixed fresh and waste water are beyond the standard requirement. The different proportions of the mixed waste...
Treatment of arsenic in drinking water has been a difficult problem, especially in the countryside, because of its high cost and inconvenience. Red soil has a relatively high clay minerals and iron and aluminum compounds and must be a natural material to solve this problem. Experimental results show that the red soil from Yuelu mountain had a high arsenic removal rate of 97.1% after 24 hours. The...
The by-products ferrous sulphate from titanium dioxide and waste sulfuric acid were used to prepare polyferric sulfate (PFS) through the direct oxidation method. The technical indicators of prepared PFS completely meet national standards when the temperature was 60°C, the strength of mixing was 120r/min, PH1.5–2.0, the ventilation was 2.0L/min. Using the prepared PFS and the purchased PFS to process...
Particles of raw water in Yangzi River were detected by the spectrum and were analyzed by SPSS methods. The results of mean test showed that the non-metallic elements had a significant role on the analysis of variance, and the structures of mineral and organic matter had a great influence on the composition of particles. The results of correlation analysis indicated that there was a significant negative...
A method using reduction roasting and magnetic separation to separate and recycle the iron resource from Bayan Obo tailings was proposed in this paper. The variation tendency of the grade and recycling rate of iron in the iron concentrate powder under different conditions of coal powder addition and temperature was studied, meanwhile, the kinetic characteristic of carbon thermal reduction reaction...
The unstable treatment of produced water was one of the puzzles for the exploitation of extra-low permeability oilfield. This work was to give a comprehensive estimation for the characteristic of the extra-low permeability oilfield produced water. For this purse, the produced water samples were collected from the produced water treatment plant located in Daqing. The physical, chemical and microbiological...
This study investigated the soil elements difference affected by operational methods in paddy field. The differences were analyzed by ANOVA statistical method. The results showed that the technique where water is retained in fallow paddy fields in the second cropping period and planted green manure has many advantages compared to all-year planting and fallow approaches.
This education paper presents three entertainment problems that may be of use to educators. These problems illustrate how to use the decibel scale for back of the envelope calculation without a calculator. “Night Comes to the Cretaceous” estimates the size the meteor believed to have caused the extinction of the dinosaurs from the diameter of the Chicxulub crater in the Yucatan, the crater excavated...
A new method for Nitrate-N removal in water has been presented in this paper, and related experiments have been carried out to study its technical characteristics. Results showed that in designed electrolysis system, Fe modified Ti substrate cathode can catalytic reduce NO3--N to NH4+-N under suitable conditions. Furthermore NH4+-N can be oxidized to N2-N in same system by supporting of Cl-. Under...
As scientific references of evaluation on the groundwater contamination, natural background levels about chemical indexes TFe and Mn of shallow groundwater in Pearl River Delta was derived with SPSS statistical software, and its spatial distribution regularities and the controlling factor were discussed. The results show that the regularity in Pearl River Delta is primarily controlled by topography,...
A new method for the determination of Fe(II) by thin layer resin phase spectrophotometry in alkali condition has been reported. The complex anion formed by Fe(II) and VA is absorbed on the 717# resin and Fe can be determined by making thin layer. The method has a high sensitivity (ε620 = 3.0×105 L·mol-1·cm-1), which is 15 times higher than that of liquid phase spectrophotometry. It has been proved...
Supported nano Cu/Fe bimetal was prepared by using KBH4 as the reducing agent when micro-scale graphite as a support material. This supported nano bimetal showed the well reductive chlorination to trichloroethylene(TCE) in the solution. The nano Cu/Fe with spherical particle and spherical nanocluster structure were synthesized in the H2O and ethanol/H2O system respectively. The size of spherical nano...
Aim at the refractory organic in ion-exchange resin regenerating wastewater using coagu-flocculation reagents to process. Use coagulants polyferric sulfate (PFS) as water pretreatment and Fenton coagulants processed water carry on catalytic oxidation. Experimental results show that catalytic oxidation method on ion exchange resin regenerating wastewater is efficiency.
Mn-Fe catalyst was prepared by the coprecipitation method. The Mn and Fe molar ratio of this catalyst contained amorphous iron-manganese oxides was 1. The process of Non-thermal plasma-assisted catalytic oxidation of NO under low-temperature was studied. The effect of factors such as space velocity, reaction temperature and composition of mixed gas on NO removal were also investigated. The results...
The oxygen-deficient ferrite (Fe3O4-??) was prepared by reduction of the natural magnetite powder with CO, and the performance of the Fe3O4-?? in decomposing SO2 into elemental sulfur was investigated. The samples, prepared by wet ball-milling of the magnetite using water as solvent for 500 hours, were characterized by means of SEM and XRD, and their activity of decomposing SO2 was tested by measuring...
An electronic tongue based on pulsed voltammetry was designed in this paper. It included five electrodes, three working electrodes (gold, glassy carbon, platinum), an Ag/AgCL reference electrode, and a platinum auxiliary electrode, and these were arranged in a standard three-electrode configuration, adopted Staircase Voltammetry (SCV) to recognize of sulfate-reducing bacteria and iron bacteria in...
A new approach to generating MRI contrast by solving the magnetic field to susceptibility source inverse problem is presented to address the quantification difficulties associated with traditional T1/T2 relaxation and susceptibility weighted T2* methods. The forward problem from source to field is reviewed. Its inverse field to source problem is ill posed. Accurate solutions are found by conditioning...
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