microwave heating of refractory minerals

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  • High Temperature Microwave Heating in Refractory

    2018-6-3 · Microwave energy can be used to create high temperatures (> 1700° C for alumina) in refractory materials. Energy conversion takes place with a very good efficiency (90% in the conversion process of microwaves to thermal energy) if an appropriate applicator is utilized.

  • MICROWAVE IRRADIATION PRETREATMENT OF A

    1987-1-1 · Objectives of Microwave Irradiation The unique heating and decomposition mechanisms of various minerals caused by microwave energy can be applied in the pretreatment of refractory gold ore or GOLD METALLURGY 329 concentrate.

  • Microwave Heating Applications in Mineral Processing

    2012-11-7 · The information compiled in this chapter demonstrates that microwave energy has the potential for application in mineral treatment and metal recovery

  • Microwave heating of magnesium silicate minerals

    2018-11-1 · The two main microwave heating mechanisms are dipolar rotation and ionic conduction, allowing a variety of materials, including minerals, to be heated upon exposure to microwave radiation . Microwaves are of interest for use in metallurgy because electric energy is efficiently converted to microwaves, microwaves transmit energy directly to samples without the need, for example, to first heat refractory, and, in the context of mineral

  • Removal of arsenic and sulfur from a refractory gold

    2010-1-1 · It has been demonstrated that microwave heating of primary refractory gold ores not only effectively oxidizes the sulfide matrix and so increases gold recovery during the cyanidation process, but also has the potential to significantly reduce the operating cost compared to other pretreatment processes, such as autoclave, roaster, bio-oxidation (Tranquilla, 1997).

  • Microwave energy for mineral treatment processes—a

    1999-7-1 · The R&D results demonstrate that microwave energy has potential in mineral treatment and metal recovery operations such as heating, drying, carbothermic reduction of oxide minerals, leaching, roasting/smelting, pretreatment of refractory gold ore and concentrate, spent carbon regeneration and waste management.

  • Studying on mineralogical characteristics of a

    2020-5-9 · Microwave roasting is a new field of magnetization roasting research. It is unique and different from conventional heating. Microwave is a non-ionizing form of electromagnetic wave with frequency ranging from 300 MHz to 300 GH, which can be absorbed by dielectrics. Thus, microwave radiation roasting is also referred to as dielectric heating.

  • Microwave pretreatment of a double refractory gold

    2007-9-1 · With regards to the application of microwaves to refractory gold ores, Haque, 1987a, Haque, 1987b has studied the microwave pretreatment of refractory sulphidic ores and achieved gold extractions of over 98%. However, there is no information published on the microwave processing of the double refractory gold ores.

  • Microwave heating characteristics of selected minerals

    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.

  • Microwave Heating Applications in Mineral Processing

    2012-11-12 · based on heating rate into hyperactive, active, difficult-to-heat and inactive. Table 2 represents the compilation results. They demonstrated that microwave energy could be effective in the heating of minerals and inorganic compounds. Material classification Heating rate reported (℃/min) Max. Temp. (℃) Hyperactive Materials UO2 200 (℃/) 1100

  • High Temperature Microwave Heating in Refractory

    2018-6-3 · Microwave energy can be used to create high temperatures (> 1700° C for alumina) in refractory materials. Energy conversion takes place with a very good efficiency (90% in the conversion process of microwaves to thermal energy) if an appropriate applicator is utilized.

  • Microwave Heating Applications in Mineral Processing

    2012-11-7 · The information compiled in this chapter demonstrates that microwave energy has the potential for application in mineral treatment and metal recovery processes such as heating, drying, grinding, leaching, roasting, smelting, carbothermic reduction of oxide minerals, pretreatment of refractory

  • Applications of microwave heating

    2021-4-2 · Microwave heating has been applied to a number of minerals processing applications. Walkiewicz et al., 1988 present data on microwave heating of a number of minerals, and speculate on the potential reduction in grinding energy required for minerals with stress fractures induced by microwave heating.

  • Studying on mineralogical characteristics of a

    2020-5-9 · Microwave roasting is a new field of magnetization roasting research. It is unique and different from conventional heating. Microwave is a non-ionizing form of electromagnetic wave with frequency ranging from 300 MHz to 300 GH, which can be absorbed by dielectrics. Thus, microwave radiation roasting is also referred to as dielectric heating.

  • Microwave heating characteristics of selected minerals

    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

  • Microwave Heating Applications in Mineral Processing

    2012-11-12 · based on heating rate into hyperactive, active, difficult-to-heat and inactive. Table 2 represents the compilation results. They demonstrated that microwave energy could be effective in the heating of minerals and inorganic compounds. Material classification Heating rate reported (℃/min) Max. Temp. (℃) Hyperactive Materials UO2 200 (℃/) 1100

  • Review Pretreatment Process on Refractory Gold Ores

    Microwave heating has the effect of reducing the tempera-ture of chemical reaction. So it can avoid generating gases of SO2 and As2O3 by controlling the temperature appropri-ately.5–7) Kyuesi and Haque, etc. have studied the role of micro-wave in the gold extraction process of arsenic-bearing refractory gold ore.8,9) Haque K E used microwave

  • [PDF] Microwave Heating for Emolliating and Fracture

    Microwave Heating for Emolliating and Fracture of Rocks. Fracture and emolliating of rocks has been traditionally used in the process of ore dressing. This process has always been given great attention. At the present stage of development of mining and processing industries except energy the efficiency of crushing rock and the increase the

  • Microwave Processing of Minerals

    2019-10-9 · Microwave Processing of Minerals Vladimir Jokovic MSc Eng, Dipl. Electrical Eng A thesis submitted for the degree of Doctor of Philosophy at microwave heating, microwave cavity design, quantifying the uniformity of heating, microwave simulation, ore sorting, dielectric properties for

  • Minerals Free Full-Text Microwave Treatment of

    At microwave heating times of 4 min or less, cracking was due primarily to thermal stress between mineral grains of different composition. These cracks were small and contributed minimal surface area compared to the cracks generated by the release of water vapour during serpentine dehydroxylation at extended microwave heating

  • Studying on mineralogical characteristics of a

    2020-5-9 · Microwave roasting is a new field of magnetization roasting research. It is unique and different from conventional heating. Microwave is a non-ionizing form of electromagnetic wave with frequency ranging from 300 MHz to 300 GH, which can be absorbed by dielectrics. Thus, microwave radiation roasting is also referred to as dielectric heating.

  • Microwave Heating Applications in Mineral Processing

    2012-11-12 · based on heating rate into hyperactive, active, difficult-to-heat and inactive. Table 2 represents the compilation results. They demonstrated that microwave energy could be effective in the heating of minerals and inorganic compounds. Material classification Heating rate reported (℃/min) Max. Temp. (℃) Hyperactive Materials UO2 200 (℃/) 1100

  • Recent developments in microwave processing of

    2013-7-18 · The demand for minerals and metals is increasing. One such area which has shown particular promise over a period of several years is the use of microwave heating technologies to improve the efficiency of various mineral processing unit operations including: leaching, refractory gold ore treatment, grindability and liberation and coal

  • Experimental Study on Microwave Pretreatment with

    The microwave pretreatment of a typically refractory flotation gold concentrate was investigated. The results demonstrated that a maximum gold recovery of 97% was achieved, and that gold recoveries of the refractory gold concentrate quickly increased to the maximum with microwave heating time. Adding additives during microwave heating process was helpful to improve the leaching rate of gold

  • Minerals Free Full-Text Evaluation of Microwave

    Microwave heating differs from conventional heating due to the fact that the microwave heating occurs via direct microwave material interaction, while the conventional heating requires the heat to be transferred from the external heat sources .As in situ heat

  • Minerals Free Full-Text Microwave Treatment of

    At microwave heating times of 4 min or less, cracking was due primarily to thermal stress between mineral grains of different composition. These cracks were small and contributed minimal surface area compared to the cracks generated by the release of water vapour during serpentine dehydroxylation at extended microwave heating

  • Microwave Processing of Minerals

    2019-10-9 · Microwave Processing of Minerals Vladimir Jokovic MSc Eng, Dipl. Electrical Eng A thesis submitted for the degree of Doctor of Philosophy at microwave heating, microwave cavity design, quantifying the uniformity of heating, microwave simulation, ore sorting, dielectric properties for

  • Microwave heating characteristics of selected minerals

    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

  • Minerals Engineering Conferences Microwave

    2021-6-10 · Microwave assisted liberation of Black Mountain mine zinc bearing minerals and oil-water emulsion separation A.F. Mulaba Bafubiandi (University of Johannesburg, South Africa) Desulfur and de-arsenic of refractory gold concentrate by microwave roasting Shaojian Ma et

  • Minerals Free Full-Text Microwave Treatment of

    Ultramafic nickel ores are difficult to process because they contain serpentine, an anisotropic mineral with a nonspherical morphology and multiple pH-dependent surface charges. Dehydroxylation of serpentine in ultramafic nickel ores by microwave treatment is proposed to improve the processability of these ores. Upon heating, serpentine is converted to olivine, an isotropic mineral that is