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Continuous Pig Iron Making by Microwave Heating with 12.5 ...

In order to make the scale-up of the microwave furnace for iron making, it has been discussed how to improve energy efficiency and to make a preferable construction. Keywords: Pig iron making, microwave heating, magnetite ore, powder, refractory.

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Microwave transmission performance of mullite refractory ...

Refractory materials are extensively applied in microwave heating instruments. Knowledge of the microwave transmission performance of refractory materials is key to improving the heating efficiency of microwave instruments. In this study, the microwave transmission performance of mullite refractory ceramics was systematically investigated with ...

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MICROWAVE METHOD FOR TEMPERING TAR-BONDED REFRACTORY …

Microwave tempering produces bricks with properties comparable to those found in bricks or other refractory articles tempered by conventional heating for much longer time periods. The microwaves energy can be applied directly to the refractory article and, consequently, energy is not lost by heating up the air or any parts of the oven housing.

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Thermochemical microwave treatment of refractory ...

Aug 18, 2013· General Analysis of Microwave-Treated Nanocrystalline Powders of Refractory Compounds. According to experimental data, the TiN and Si 3 N 4 nanopowders and their mixtures are heated to 350°C without any noticeable differences (Fig. 2).However, the heating rate was somewhat different for the 40 wt.% Si 3 N 4 –60 wt.% TiN mixture, apparently due to a large amount of elemental …

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Fricke und Mallah Microwave Technology Product …

HF-Technik develop microwave plasma sources with a excellent heat coupling. The result is a particularly high plasma density and high temperature processes of up to 5,000 °C. This field is generated by our microwave generator with 2.45 GHz and 3 kW output power. The plasma jet …

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Synthesis of chromium carbide nanopowders via a microwave ...

Jul 01, 2015· The phase compositions of the synthesized products were identified by X-ray diffraction. Fig. 1 shows the XRD patterns of the powders prepared by microwave heating method at different temperatures for 1 h.As shown in Fig. 1(a), the peaks are identified as Cr 3 C 2 (JCPDS 35-0804), Cr 7 C 3 (JCPDS 11-0550) and CrO (JCPDS 06-0532), indicating that the oxidation–reduction reaction …

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US4307277A - Microwave heating oven - Google Patents

A microwave heating oven comprises an inner casing or particles as an inner casing which is made of a material being heated by microwave in which a material being heated is placed; an intermediate casing made of a refractory insulator which causes less microwave loss and which covers said inner casing or particles; and means for applying the microwave from outside of the intermediate casing ...

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Microwave Smelter : 8 Steps (with Pictures) - Instructables

The microwave I used was an 850W microwave (model: GE 3850W3W081A), I used regular bricks to build the hearth to keep the crucible and a silicon-carbide material as the heating element (I also used building insulation to try and keep the heat directed inwards, a terrible terrible mistake).

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Microwave heating method and apparatus for iron oxide ...

Oct 03, 2007· A vertical shaft furnace can also be used in which the ore pellets or other feed material is introduced at the top of a refractory lined cylinder. Microwave heating is carried out as the material descends down the furnace. An induction heater may be provided at the bottom which receives DRI and produces melted iron discharged therefrom and is ...

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Microwave technique for brazing materials - California ...

Jan 16, 1998· The present invention generally relates to the use of microwave heating to join similar and dissimilar materials. In particular, the preferred embodiment describes the brazing of components in the fabrication of abrasion resistant cutter assemblies. ... or a composite of a refractory hard metal and a metal. Refractory hard metal includes a ...

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Microwave Sintering of Refractory Metals/alloys: W, Mo, Re ...

Furthermore, conventional heating is mostly radiative, which leads to non-uniform heating in large components. This review article describes recent research findings about how these refractory metals and alloys (W, Mo, Re, W-Cu, W-Ni-Cu and W-Ni-Fe) have been successfully consolidated using microwave sintering. A comparative

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Microwave Heating of Ceramics | 2015-10-01 | Industrial ...

Dec 10, 2013· 10%· 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 …

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High Temperature Microwave Heating in Refractory Materials ...

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.

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Dynamic Transmission Performances of Alumina and Mullite ...

This paper proposes an analytical approach to optimize the thickness of refractories for achieving maximum microwave power transmission in microwave heating based on the analysis of power transmission coefficient (PTC). The microwave PTCs of alumina (Al 2 O 3 ) ceramics over the temperature range of 22-1,379°C at 2,450 MHz, mullite ceramics in the temperature range of 27 …

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US7011136B2 - Method and apparatus for melting metals ...

A method and apparatus for melting metals uses microwave energy as the primary source of heat. The metal or mixture of metals are placed in a ceramic crucible which couples, at least partially, with the microwaves to be used. The crucible is encased in a ceramic casket for insulation and placed within a microwave chamber. The chamber may be evacuated and refilled to exclude oxygen.

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Innovative Applications for Microwave Heating - Melting ...

Innovative applications for microwave heating – Melting and controlled solidification of metals, drying and heating of refractory materials Malte Möller, Horst Linn E Fig. 1:Microwave heating curve of a single 55 kg refractory brick

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Microwave Heating Applications in Mineral Processing ...

Nov 07, 2012· 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 gold concentrate or ore, spent carbon regeneration ...

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microwave heating of refractory minerals

High Temperature Microwave Heating in Refractory Materials . 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 Experiments at 245 GHz involving either the sintering of alumina ...

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Microwave absorptivity of refractory powders depending on ...

Oct 30, 2010· 10%· The microwave absorptivity of refractory metallic compounds at 2.45 and 9.53 GHz is studied. It is ascertained that electromagnetic absorption is influenced by the grain size of absorbing particles: when it increases by 10 times, the absorptivity of ZrC, ZrSi2, HƒC, TaN, HƒN, ZrN, and NbC particles becomes higher by a factor of 7 and that of SiC, NbSi2, WC, B4C, MoSi2, and VN …

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Microwave heating oven - Mitsubishi Denki Kabushiki Kaisha

A microwave heating oven comprises an inner casing or particles as an inner casing which is made of a material being heated by microwave in which a material being heated is placed; an intermediate casing made of a refractory insulator which causes less microwave loss and which covers said inner casing or particles; and means for applying the microwave from outside of the intermediate casing ...

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Electromagnetic waves transmission performance of alumina ...

Refractory materials are an important part of industrial microwave heating equipment, and their transmission performance has a significant influence on the efficiency and uniformity of microwave heating. In this study, electromagnetic wave power transmission coefficients (PTCs) of alumina refractory ceramics are calculated within the temperature range of 22–1379 °C and the thickness …

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Solved! Why Is My Microwave Not Heating? - Bob Vila

A microwave not heating can be an inconvenience. Before settling for cold leftovers or buying a new one, check out Bob Vila's troubleshooting tips.

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EP0009669B1 - Microwave drying of ceramic shell molds ...

In the illustrated embodiment of the invention as shown in the drawing, an improved method of drying a refractory slurry layer deposited on a mold pattern formed of a thermally fusible material having low heatability by subjection to microwave energy is shown to include the steps of depositing a slurry layer on the mold pattern, heating the ...

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Model of process of microwave action on refractory gold ...

10%· 1. A number of different methods have been used to study the material composition and particle size distribution of a gravity concentrate. 2. Several different processing regimes have been tested in the treatment of the gravity concentrate in a microwave field. It has been established that a processing scheme consisting of calcination followed by cyaniding gives a 94.8% recovery of gold …

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US4190757A - Microwave heating package and method - Google ...

The invention provides a distribution and heating method for foodstuffs and an inexpensive disposable microwave shipping, heating and serving package for food composed of a paperboard carton and a lossy microwave energy absorber which becomes hot when exposed to microwave radiation. The absorber is associated in conductive heat transfer relationship with a food product contained in the …

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Microwave absorptivity of refractory powders depending on ...

Oct 30, 2010· The microwave absorptivity of refractory metallic compounds at 2.45 and 9.53 GHz is studied. It is ascertained that electromagnetic absorption is influenced by the grain size of absorbing particles: when it increases by 10 times, the absorptivity of ZrC, ZrSi2, HƒC, TaN, HƒN, ZrN, and NbC particles becomes higher by a factor of 7 and that of SiC, NbSi2, WC, B4C, MoSi2, and VN particles …

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Heat Transfer Conduction Calculator | Thermtest Inc.

The heat transfer conduction calculator below is simple to use. Enter the thermal conductivity of your material ( W/m•K) OR select a value from our material database. Input the cross-sectional area ( m 2) Add your materials thickness ( m) Enter the hot side temperature ( °C) Enter the cold side temperature ( °C) Click "CALCULATE" solve ...

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Microwave Kilns - University of Washington

Jan 23, 2021· Microwave kilns and microwave kiln processing of glass and ceramics have been around for over twenty years (thus its really not a new technology). ... There is a limit to how big this type of "kiln" can be,as the castable refractory absorbs heat from the receptor and becomes a thermal "sink" ...

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