XRD In Situ Observation of Carbothermic Reduction of Magnetite Powder in Microwave Electric and Magnetic Fields

2013 ◽  
pp. n/a-n/a ◽  
Author(s):  
Nils Sabelström ◽  
Miyuki Hayashi ◽  
Yuki Yokoyama ◽  
Takashi Watanabe ◽  
Kazuhiro Nagata
Keyword(s):  
Magnetic Fields ◽  
Carbothermic Reduction ◽  
In Situ Observation ◽  
Electric And Magnetic Fields

Responsive left-handed behaviour of ferromagnetic microwire composites by in-situ electric and magnetic fields

2020 ◽  
Vol 19 ◽  
pp. 246-252
Author(s):  
Shilu Zhao ◽  
Faxiang Qin ◽  
Yang Luo ◽  
Yunfei Wang ◽  
Azim Uddin ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Left Handed ◽  
Electric And Magnetic Fields ◽  
Ferromagnetic Microwire

scholarly journals In-situ Observation and Differential Thermal Analysis of MnBi in High Magnetic Fields

2015 ◽  
Vol 75 ◽  
pp. 1324-1331 ◽  
Author(s):  
Daiki Miyazaki ◽  
Yoshifuru Mitsui ◽  
Ken-ichi Abematsu ◽  
Kohki Takahashi ◽  
Kazuo Watanabe ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Magnetic Fields ◽  
High Magnetic Fields ◽  
In Situ Observation

scholarly journals In Situ Observation of the Carbothermic Reduction and Foaming of Slags in Silicomanganese Production

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 2020
Author(s):  
Vincent Canaguier ◽  
Merete Tangstad
Keyword(s):  
Carbothermic Reduction ◽  
Sessile Drop ◽  
Raw Materials ◽  
Reduction Reaction ◽  
Furnace Operation ◽  
Graphite Substrate ◽  
In Situ Observation ◽  
High Carbon ◽  
Slag Droplet

The carbothermic reduction of slag in silicomanganese production is accompanied by the release of carbon monoxide. This gas can accumulate as bubbles within the slag, leading to foaming and, potentially, disturbances to furnace operation. This study investigated the reduction in the slag together with its foaming using a sessile drop furnace. Five silicomanganese slags produced from industrial raw materials (Assmang ore, Comilog ore, high-carbon FeMn slag with quartz, and FeS additions) were reduced by a graphite substrate at isothermal conditions (i.e., 1540–1660 °C) under CO atmosphere. The reduction reaction was tracked by photographing the slag droplet, and the cyclic expansion and burst of the droplet were used to estimate the gas evolution. The reacted samples were analyzed by wavelength-dispersive X-ray spectroscopy (WDS) to determine MnO and SiO2 reduction. While no foaming was observed using Comilog ore, extensive retention of CO in the slag phase was observed when using Assmang ore or Assmang with high-carbon FeMn slag. The beginning of foaming was attributed to an increase in the reaction rate; the absence of foaming when using Comilog can be attributed to the acidity of the charge. Addition of sulfur to the Comilog-based charge did not influence the reduction.

In Situ Observation of Catalyzed Gasification of Graphite by Nickel

1981 ◽  
Vol 39 ◽  
pp. 76-77
Author(s):  
R. T. K. Baker ◽  
R. D. Sherwood
Keyword(s):  
Objective Lens ◽  
In Situ Observation ◽  
Gas Flows ◽  
Catalytic Gasification ◽  
Television Camera ◽  
Viewing Screen ◽  
Fuels And Chemicals ◽  
Gasification Of Carbon ◽  
Transmission Microscope

The catalytic gasification of carbon at high temperature by microscopic size metal particles is of fundamental importance to removal of coke deposits and conversion of refractory hydrocarbons into fuels and chemicals. The reaction of metal/carbon/gas systems can be observed by controlled atmosphere electron microscopy (CAEM) in an 100 KV conventional transmission microscope. In the JEOL gas reaction stage model AGl (Fig. 1) the specimen is positioned over a hole, 200μm diameter, in a platinum heater strip, and is interposed between two apertures, 75μm diameter. The control gas flows across the specimen and exits through these apertures into the specimen chamber. The gas is further confined by two apertures, one in the condenser and one in the objective lens pole pieces, and removed by an auxiliary vacuum pump. The reaction zone is <1 mm thick and is maintained at gas pressure up to 400 Torr and temperature up to 1300<C as measured by a Pt-Pt/Rh 13% thermocouple. Reaction events are observed and recorded on videotape by using a Philips phosphor-television camera located below a hole in the center of the viewing screen. The overall resolution is greater than 2.5 nm.

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