Papers by Keyword: Micro-Wave

Abstract: The main difficult problem was decolorization in the treatment of dye wastewater. Organic modified montmorillonite could be a good adsorbent to settle this problem. An organic modified montmorillonite was prepared using microwave irradiation method instead of common water bath heating method, and the decolorization on dye watewater of acid fuchsin was reasearched. Its decolorization on acid fuchsin solution was better obviously than that of montmorillonite. And the decolorization rate was increase with the increase of the initial concentration of acid fuchsin. When the concentration of acid fuchsin solution was 40 mg/L, the optimum decolorization condition was 0.1 g of adsorbent quantity, 6.1 of pH, 30 min of contact time, and 25 °C of operation temperature.

Abstract: Nanocrystalline carbonated hydroxyapatite was produced through hydraulic conversion of calcium phosphate cement in simulated body fluid (SBF) and then heated in a microwave oven at 1000-1250 °C. The phase composition and microstructures were evaluated, before and after the thermal processing, using XRD and SEM, respectively. Total porosity and bending strength of the samples were also tested. Proliferation and morphology of osteoblastic cells on samples were evaluated using MTT method. Limited growth of apatite crystals was observed by the thermal treatment in which the samples exhibited a crystal size of ~ 150 nm at heating temperature of 1250 º. Based on the results, the microwave irradiation led to a little change in phase composition of carbonated apatite and slight amount of β-TCP phase was found together with large amount of apatite. The sample irradiated at 1250 °C formed more dense material having bending strength value up to 130 % that of unheated sample. The in vitro cell studies showed that the microwave irradiated samples could provide adequate cell proliferation and attachment.

Abstract: Plasma Chemical Vapor Deposition ( PCVD ) is an important application in making optical fiber core rod. The resonator is the key part for PCVD application. But the existing resonator have several serious disadvantages: its working is not stable; the size of deposited substrate tube is small(Ø31mm); the deposition rate is low(2.5g/min) and the deposition effect is unsymmetrical; the fabrication of the resonator is very difficult and expensive. Therefore, a new type of resonator, a cylinder resonator, is designed to overcome the above disadvantages. The cylinder resonator supports bigger substrate tube (Max Ø60mm) and higher deposition rate(3.2g/min) than existing ones, while its working is also more stable. Since the structure is more simple, the fabrication is easier and cheaper. The corresponding microwave theoretical method of the new resonator designing is also introduced with the necessary computer simulation, as well as test running. And TE111 mode microwave is the Fundamental Mode of the cylinder resonator. The cylinder resonator has been applied in normal production for 4 years, which is better for bigger size core rod making, improving the optical fiber quality and saving cost. It is estimated, after modification with the cylinder resonator and 10kW microwave generator, a PCVD lathe can yield 30% more rods than before.

Abstract: The comprehensive utilization of fly ash mainly concentrated is in construction engineering channels, road engineering, it used to deal with waste water is full of hope. As this, it can achieve the purpose of using the waste to conduct waste. Fly ash was modified by a microwave radiation. This method was simple and easy to operate . When the dosage of Modified fly ash is 4g, the pH value is 6.2, the mixing time is 50min, the initial concentration of copper solution is 1.85mg/L ,Adsorption rate of modified fly ash on Cu²⁺ reached 96%.

Abstract: Paper analysises active regulation of microwave to heavy oil by experiment and theory. Determine heavy oil’ rheological indicators before and after . test the composition and structure of heavy oil by the chemical analysis tools, before and after the role of the microwave, analysis the cause of rheological change. Based on the theories of electromagnetic field and the thermodynamic, Establish the mathematical model of microwave effect on heavy oil, determine the experimental temperature distribution inside the heating chamber, and further analysis the mechanism of microwave on heavy oil. Also introduced field application of single-well oil pipeline microwave heater which was development by experiments and theory research. Experimental and theoretical analysis shows that the microwave effect on heavy oil, both have thermal effects and non-thermal effects. Field application shows that microwave is feasible used in heating pipeline in theory, field trials are successful.

Abstract: Through comparative experiments of products that treated by microwave, researched on the feasibility of disposing oil sludge with microwave technology, analyzed the influence of different microwave parameters (power of microwave and microwave effect time) on the treatment effect, and theoretically analyzed the mechanism of harmless and resourceful treatment of oil sludge with microwave. The experimental and theoretical studies have shown that, microwave radiation has the characteristic of quickly and efficiently, energy conservation and environmental protection, and superior to traditional heating treatment technology. Microwave thermal effect and non-thermal effect can make heavy hydrocarbon cracking, speed up the process of oil sludge separation for gas phase, liquid phase, and solid phase, and achieve the oil sludge harmless and resourceful treatment.

Abstract: Granular activated carbon (GAC) is extensively used to remove natural organic matter and residential chlorine in water treatment process of power plant. After being used, the spent GAC needs to be regenerated in order to save on operation costs and reduce solid waste disposal. In this study, microwave technique was tried to regenerate the field-spent GAC from a power plant. The effect of microwave power, irradiation time and hydrochloric acid pretreatment were investigated, it was found that microwave could recover the adsorption capacity of GAC within a short time and the tannic acid adsorption efficiency of regenerated GAC was 9 times greater than spent GAC; hydrochloric acid pretreatment could improve the regeneration process, it showed the highest removal efficiency and iodine number, 99.6% and 859 mg/g respectively. The results obtained from SEM-EDX showed that hydrochloric acid pretreatment could remove inorganic matter and other impurities of GAC. All these indicate that microwave technique can effectively regenerate field-spent GAC, and hydrochloric acid pretreatment is an important process before regeneration.

Abstract: The (Y,Eu)2O3 precursor prepared by microwave with ultrasonic-assisted co-precipitation is superior to the one prepared by co-precipitation of conventional approach as well as co-precipitation assisted by microwave. The effect of preparation conditions on the morphology and particle size of (Y,Eu)2O3 precursor was completely investigated in this study. The ideal conditions were optimized as 0.25M Ln3+ ions concentration, 80°C reaction temperature, 90 minutes reaction time and 0 minute ageing time. Consequently, the (Y,Eu)2O3 precursor in the needle-like shape with average size of 0.25μm in diameter was obtained. The possible mechanism was also presented.

Abstract: The influences of different catalysts added to the activated carbon were studied for reducing energy consumption and enhancing reaction selectivity while microwave irradiate activated carbon for removal of sulfur dioxide and nitrogen oxides. It was found that the addition of catalyst can lower the power of microwave needed for the same sulfur dioxide and nitrogen oxides removal efficiency to a large extent; moreover, different catalysts introduced would cause different effects, in which the zincous catalyst and manganese catalyst had more apparent catalytic effects, about 95% removal efficiency could be achieved under microwave power 420W. X-ray diffraction (XRD) was adopted to have a study of the microstructure of the activated carbon, and it is shown that some catalyst components do exist on the surface of the activated carbon

Abstract: In the experiments of microwave radiation sludge, the method of air floating, settlement and centrifugal separation are employed to research the demulsification effect of sludge comparative. Results show that: A perfect demulsification effect can be obtained when the radiation intensity is 2w/g, sludge PH value is 2, radiation time is 3-4min, slurry ratio is 1:3 and the oil sludge is processed by microwave.