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  • Effect of modified graphene and microwave irradiation on

     · After irradiation (10 min) the storage modulus further improved to 11.9 and 27.6 of nanocomposites. The glass transition temperature of nanocomposites also improved considerably after melt mixing and microwave irradiation (but only for polymer MG nanocomposite).

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  • The assessment of the factors affecting the microwave

     · Kahraman et al. (2020) examined the effects of the microwave irradiation on the compressive and tensile strength of magmatic rocks treated at the powers of 1 2 and 6 kW for the varying treatment times. They showed that microwave radiation has significant impacts on the compressive and tensile strength of magmatic rocks.

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  • Thermal response and crack propagation of mineral

     · Microwave pre-treatment of mechanical rock breakage is an efficient technology to reduce bit wear and maintenance cost of the breaker. Thermal responses of basalt and its mineral components were tested using a multimode industrial microwave system. Different dielectric properties of the mineral components resulted in thermal stress within the basalt and hence crack propagation. Crack patterns

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  • Microwave-induced degradation of atrazine sorbed in

     · Atrazine sorbed on the minerals degraded under microwave irradiation due to interfacial selective heating by the microwave while atrazine in aqueous solution and associated with PTFE powder was not affected. Atrazine degraded rapidly in the micropores of

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  • What is the best way of irradiating transparent minerals

    Is there anybody have a idea for treating and microwave irradiation of transparent minerals such as silica in multi-mode microwave (like conventional kitchen microwave) Silica is transparent

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  • Physical assessments of termites (Termitidae) under 2.45

     · A microwave irradiation system (Sunny Engineering Co. Ltd MTS03(S) Osaka Japan) consisting of a semiconductor microwave oscillator and an applicator was used for the microwave irradiation

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  • Water Free Full-Text Microwave Irradiation in

    Every year the human impact on the world s water sources becomes more pronounced. One of the triggers to this increase is the use of ineffective wastewater and sludge treatment systems. Recently the number of studies of microwave processing in handling liquid municipal and industrial waste has increased. This paper discusses heat treatment change in properties decomposition of substances

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  • WOA1Microwave irradiation of mineral ores

    An admixture of mineral ore or concentrate and particulate carbon is irradiated with microwave energy to produce metallic droplets and the droplets are collected. In a preferred form the apparatus includes a hopper (11) which feeds the admixture (12) to an inclined column (5) through which the mixture passes and is radiated with microwave energy.

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  • Microwave-induced degradation of atrazine sorbed in

     · The herbicide atrazine is a common pollutant in reservoirs and other sources of drinking water worldwide. The adsorption of atrazine from water onto zeolites CBV-720 and 4A mesoporous silica MCM-41 quartz sand and diatomite and its microwave

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  • Effects of microwave pre-treatment on the flotation of

    In addition the XPS results reveal that microwave irradiation facilitates the conversion of Fe 2 to Fe 3 on the mineral surfaces. The FTIR spectra and zeta potential values indicate that microwave irradiation can enhance the chemical adsorption of oleate ions on the surface of the ilmenite.

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  • A new rapid synthesis of potassium borates by microwave

    Abstract Potassium borates are one of the minor groups of boron minerals with its distinct non-linear optical properties. In this study potassium borate compound of santite (KB5O8·4H2O) are synthesized using potassium carbonate (K2CO3) and boric acid (H3BO3) with a new and rapid method of microwave irradiation.

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  • Microwave heating characteristics of selected minerals and

    Naturally occurring minerals and reagent-grade compounds were tested to determine their receptivity to microwave heating. The maximum temperature achieved for the samples and the time required to reach temperature are reported. A description of the microwave oven and a thermocouple technique that accurately measures and continuously records the temperature of samples during irradiation are

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  • Microwave-induced Degradation of Atrazine Sorbed in

     · microwave irradiation. Compared to microwave power and irradiation time (Figure 2b) the initial mass loading appeared to have little influence on its degradation rate. Within the micropores of CBV-720 atrazine molecules co-existed with relatively much large number of water molecules

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  • Microwave-assisted preparation of monolithic molecularly

    In this work a novel microwave-assisted method was developed for fast and batch fabrication of monolithic molecularly imprinted polymer (MIP) fibers. It was based on in situ polymerization in a flexible capillary mold under microwave irradiation. The proposed method greatly shortened the preparation time (about 20-fold) in comparison with the conventional heating.

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  • Microwave Energy Aided Mineral Comminution

     · Late 1900s witnessed microwave energy as the new source for developing heat stresses among mineral assemblies inside the ore and has been found as a unique solution for the economic viability. Microwave is a form of electro magnetic radiation having frequency between 3000 MHz to

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  • Influence of microwave irradiation on ilmenite flotation

     · Their studies showed that the microwave irradiation improves the TiO2 grade and recovery from 36.1 to 36.5 and 65 to 84 respectively. In addition their results indicated that the microwave irradiation does not have significant effects on the surface properties of the gangue minerals .

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  • Solvent-free organic syntheses on mineral supports using

    An expeditious and solvent-free approach for selective organic synthesis is described which involves simple exposure of neat reactants to microwave (MW) irradiation. The coupling of MW irradiation with the use of catalysts or mineral supported reagents under solvent-free conditions provides clean chemical processes with special attributes such as enhanced reaction rates higher yields

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  • Materials Free Full-Text Microwave Irradiation Effect

    Polystyrene-reduced graphene oxide (PSTY/RGO) composites were prepared via the in situ bulk polymerization method using two different preparation techniques. The general approach is to use microwave irradiation (MWI) to enhance the exfoliation and the dispersion of RGO nanosheets within the PSTY matrix. In the first approach a mixture of GO and styrene monomers (STY) were polymerized

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  • Microwave-assisted preparation of monolithic molecularly

    In this work a novel microwave-assisted method was developed for fast and batch fabrication of monolithic molecularly imprinted polymer (MIP) fibers. It was based on in situ polymerization in a flexible capillary mold under microwave irradiation. The proposed method greatly shortened the preparation time (about 20-fold) in comparison with the conventional heating.

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  • Synergistic effect of microwave irradiation and CaF 2 on

    The effect and mechanism of microwave irradiation on vanadium leaching were studied via a comparison between microwave heating and conventional heating. The results show a synergistic effect of microwave irradiation and calcium fluoride (CaF 2 ) on the vanadium leaching efficiency. It is confirmed that the vanadium leaching process can be improved by microwave irradiation when CaF2Chat Online

  • Synergy between microwave irradiation and

    mineral oxides are poor conductors of heat whereas they absorb microwave irradiation very efficiently 3 a situation that produces a real benefit for supported reactions induced by microwaves. In this respect microwave irradiation has been applied with success to several kinds of reactions.

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  • Intensification of Polymetallic Sulfide Ore Dressing by

    Intensification of Polymetallic Sulfide Ore Dressing by High-Energy Electrons et al. "Factors responsible for reduction in mineral strength as a result of mineral irradiation " Fiz.-Tekh. Probl. Razrab. Polezn. Iskop. No. 3 (1996). 12. A. M. Mikhailov and V. I. Rostovtsev "Mechanism of the weakening and

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  • Effect of microwave irradiation on the grinding and

    In this study the influence of microwave irradiation on the grinding characteristics and magnetic separation of vanadium titano-magnetite (VTM) was investigated including the effects of microwave power microwave irradiation time and particle size of VTM. The particle size distribution of the ground product and Fe grade in magnetic fraction of the untreated and microwave-treated VTM were

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  • Microwave-induced degradation of atrazine sorbed in mineral

     · Atrazine sorbed on the minerals degraded under microwave irradiation due to interfacial selective heating by the microwave while atrazine in aqueous solution and associated with PTFE powder was not affected. Atrazine degraded rapidly in the micropores of

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  • Experimental Investigation on the Effects of Microwave

     · Microwave energy can be used to assist mechanical rock breakage for civil and mining engineering operations. To assess the industrial applicability of this technology microwave heating of basalt specimens in a multi-mode cavity (a microwave chamber) at different power levels was followed by conventional mechanical strength and fragmentation effect tests in the laboratory.

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  • Hydrolytic Depolymerization of PET in a Microwave Reactor

     · Microwave irradiation was found to reduce the time needed to achieve a specific degradation of PET significantly with almost complete depolymerization occurring in 30 min at 180 °C and only 46 W of microwave power.

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  • Dynamic fragmentation of microwave irradiated rock

     · In the current study FG specimens were irradiated by microwave with the power of 6 kW for different durations. To determine the appropriate range of irradiation duration an FG specimen was exposed to microwave for 5 min in the preliminary trial. Fig. 3 a shows the lava eruption and solidification observed on the irradiated specimen.

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  • Minerals Free Full-Text Exploration of Polymetallic

    In 2006 the BGR signed a contract with the International Seabed Authority (ISA) for the exploration of polymetallic nodules in the Clarion-Clipperton Zone of the northeast Pacific. During nine expeditions in particular "Area E1" the eastern part of the contract area with a size of 60 000 km2 was explored in detail. Here we outline BGR s exploration methods and provide resource

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  • Preparation and Electrochemical Properties of Multiscale

     · Then we adapted microwave irradiation method in the carbonization and activation process. Compared with traditional heating methods microwave irradiation heating has advantages of fast speed high efficiency uniform heating high efficiency of energy conservation easy to operate and easy to automatically control 13 14 .

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  • Determination of the mineral fraction and rheological

    The goal of this study was to evaluate the effect of the physical modification by microwave irradiation on the mineral fraction and rheological properties of starch isolated from Canna edulis rhizomes. Phosphorus sodium potassium magnesium iron calcium and zinc were evaluated using atomic absorption spectrophotometry.

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  • Effect of microwave irradiation on the grinding and

    In this study the influence of microwave irradiation on the grinding characteristics and magnetic separation of vanadium titano-magnetite (VTM) was investigated including the effects of microwave power microwave irradiation time and particle size of VTM. The particle size distribution of the ground product and Fe grade in magnetic fraction of the untreated and microwave-treated VTM were

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  • Intensification of Polymetallic Sulfide Ore Dressing by

    Intensification of Polymetallic Sulfide Ore Dressing by High-Energy Electrons et al. "Factors responsible for reduction in mineral strength as a result of mineral irradiation " Fiz.-Tekh. Probl. Razrab. Polezn. Iskop. No. 3 (1996). 12. A. M. Mikhailov and V. I. Rostovtsev "Mechanism of the weakening and

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  • EFFECT OF MICROWAVE IRRADIATION ON ASPECT

     · ratio. After chemical treatment the mica underwent microwave irradiation and grinding. After leaching with concentrated HCl the aspect ratio of mica was examined with and without microwave irradiation. In a separate experiment the aspect ratio of mica was examined after leaching with lithium nitrate with and without microwave irradiation.

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  • Microwave Oven Radiation FDA

     · In fact foods cooked in a microwave oven may keep more of their vitamins and minerals because microwave ovens can cook more quickly and without adding

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  • Effect of microwave pretreatment on the liberation

     · The influence of microwave radiation on the liberation of the valuable minerals in a massive sulfide ore is presented. In general sphalerite shows the highest degree of liberation with a maximum value of 84 . Sphalerite is followed by galena with 73 liberation and chalcopyrite with 63 liberation. A fine feed size and a high microwave power are the two common requirements for the liberation

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  • Leaching of Refractory Gold Ores by Microwave Irradiation

     · The present paper attempts to assess the effects of microwave irradiation on the leachability of refractory gold ores. Characteristics of the crystal structure and microstructure of the ores were determined by x-ray structural analysis (XRD) and scanning electron microscopy (SEM) before and after microwave irradiation. Compared to conventional processes microwave leaching processes are

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  • Comparison of the mechanisms of microwave roasting and

     · Experiments comparing microwave blank roasting and conventional blank roasting for typical vanadium-bearing stone coal from Hubei Province in central China in which vanadium is present in muscovite were conducted to investigate the effects of roasting temperature roasting time H 2 SO 4 concentration and leaching time on vanadium extraction.

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  • The influence of microwave irradiation on thermal

     · The microwave irradiation tests were performed with a power of 2 kW and exposure time of 3 min for all samples. The top two magnetrons in the roof of the cavity were used to achieve the power level. The mineral samples were placed in an optimized position which had a distance approximate of 12 cm to the microwave antenna.

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  • Fast low-cost preparation of hackmanite minerals with

     · microwave at different periods of time (0 2 4 6 8 10 12 14 18 and 20 minutes). After the microwave irradiation the material was quenched to room temperature and collected to further characterization. 1.2. Characterization The crystal structure of the materials was verified with X-ray powder diffraction (XPD)

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  • Microwave irradiation of nanohydroxyapatite from chicken

    Due to similarity in composition to the mineral component of bones and human hard tissues hydroxyapatite with chemical formula Ca10(PO4)6(OH)2 has been widely used in medical field. Both chicken and duck eggshells are mainly composed of calcium carbonate. An attempt has been made to fabricate nanoh

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  • Heating characteristics of igneous rock-forming minerals

     · Microwave-assisted mechanical excavation has been considered as a promising rock breakage method and is widely studied in recent years. Heating characteristics of minerals are the basis of research on the weakening effect of microwave irradiation on rock. In this paper 14 igneous rock-forming minerals were microwave heated.

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  • Minerals Free Full-Text Exploration of Polymetallic

    In 2006 the BGR signed a contract with the International Seabed Authority (ISA) for the exploration of polymetallic nodules in the Clarion-Clipperton Zone of the northeast Pacific. During nine expeditions in particular "Area E1" the eastern part of the contract area with a size of 60 000 km2 was explored in detail. Here we outline BGR s exploration methods and provide resource

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