Showing posts with label Research and Development. Show all posts
Showing posts with label Research and Development. Show all posts

August 16, 2010

Central Salt and Marine Chemical Research Institute, India expects an US patent for developing a technology of extracting Refractory Grade Magnesia from Sea Water

An indigenous technology for extracting refractory grade Magnesia from sea water by the Central Salt and Marine Chemical Research Institute (CSMCRI) is in the process of being granted US patent which will definitely boost the production of high-grade refractory products for the steel sector.
"We have been granted notice of allowance for a US patent filed on technology for extracting high grade Magnesia of 99.3 per cent purity from concentrated sea water," institute's director Pusphito Ghosh said.
"Shortly, the US patent for this homegrown technology will also be granted," Ghosh said.
Refractories are lining materials which can not be dispensed with in order to continue any high temperature furnace or kiln operations. Such material is largely used in linings for furnaces, kilns, incinerators and reactors. High grade Magnesia is the core product used in lining of refractories at steel smelting plants. Besides, it finds application in cement, glass and copper smelting industry, industry sources said. The availability of high grade magnesia for industrial purposes is scarce and the commodity has to be imported at a high cost to meet the domestic demand.
"Relining of refractories at steel smelting plants will reduce due to our finding of high grade magnesia," Ghosh said.
"This radical change in extraction of such high purity magnesia from concentrated sea water will come as a major boost for making high grade refractory products for the steel industry," a steel ministry official said.
"The institute's process of preparation of magnesia from magnesium hydroxide was granted US patent this month. The high grade magnesia extracted through this indigenous process was of 97.3 per cent purity," Ghosh said.
CSMCRI, a laboratory of Council of Scientific and Industrial Research (CSIR) is situated in Bhavnagar (Gujarat) has now proposed to set up a pilot manufacturing plant of around 0.4 tonnes capacity per day for this high grade Magnesia (99.3 per cent purity).
Source: PTI inputs    

August 9, 2010

Siemens LiquiRob Technology: First installation by Riva Group at the electric arc furnace

liquirob technology
The Riva Group has become the world’s first steel producer to use the Siemens LiquiRob technology at an electric arc furnace. LiquiRob improves operational safety and increases precision of measurement and sampling. The robot system has been installed in its French plant in Neuves-Maisons where it handles sampling and temperature and Celox measurements. Operating personnel now no longer need to enter potentially dangerous areas, which has substantially increased industrial safety. The system is designed for fully automatic operation and enables precise and reliable measurements to be made at frequent intervals. The acceptance certificate was issued mid-March.
The Neuves-Maisons works produces rebars and coils, and belongs to the SAM Division of the Riva Group based in Milan, Italy. The plant produces steel in an electric arc furnace with a tapping weight of 150 tons and a ladle furnace. The steel cast on a six strand sequential billet casting plant, from which the billets pass on to a rolling mill for further processing. The solution implemented in Neuves-Maisons also includes installation of three automated magazines to store the sample and measuring, which can be safely filled by the operating personnel one time per day outside the dog house. The sampling and measuring procedures can be run completely automatically.
Until recently, the operating personnel had to enter the dog house to take samples and measure the temperature and oxygen activity of the liquid steel using a manipulator. These dangerous and strenuous activities are now handled by the LiquiRob System which accesses the steel bath directly through a window in the slag door. The robot system is operated and monitored from a central control room. Siemens was responsible for integrating the LiquiRob System into the existing Dog house and the EAF automation system, as well as for commissioning, and training the operating personnel. Siemens developed LiquiRob specifically to improve industrial safety and the quality of measurements under the harsh operating conditions encountered in the iron and steel industry. The system was implemented for the first time in 2008 in the Gwangyang Steel Works of the Korean company Posco. There, LiquiRob is used for sample taking, temperature measurement within the distributor and for casting powder dosing on the casting platform of a two strand Slab Caster. 
 
Further information about solutions for steel works, rolling mills and processing lines can be found at http://www.siemens.com/metals

July 27, 2010

Asahi Glass Co., Ltd. (AGC) to Sell Glass-Ceramic Substrate


Asahi Glass Co., Ltd. (AGC) has announced it will start sales of a new glass-ceramic substrate that enables high-brightness and high-durability for LED lighting. This new glass-ceramic substrate will expand LED applications in the lighting and illumination sector, including 3-D televisions and automotive lighting, in which high-power output is increasingly in demand. Starting the volume production at a newly built factory in Taiwan, AGC reports that it plans to achieve a market share of 20% or more in the glass-ceramic substrate market for high-output LED lighting, which is expected to grow into a 100 billion yen (about US$1 billion) market by 2020.

LED applications are currently limited primarily to products with extremely small power output, such as liquid crystal display televisions and home interior lighting. In the future, however, the demand trend is expected to shift toward high-output LED applications that require high brightness, such as 3-D televisions, automotive headlights, and other automotive lighting and outdoor lighting and illumination. In addition to high brightness, high durability is also a prerequisite for high-output LED applications, as heat generation becomes greater as the power output increases.
For more details logon: www.agc.co.jp   

December 16, 2009

Mullite - Chrome Refractory

Mullite - Chrome refractory phase is a part of the Alumina - Chrome - Silica (Al2O3-Cr2O3-SiO2) ternary system. It won’t be irrelevant to mention here that I, the author of this blog, obtained my PhD in Refractories for my work on Mullite - Chrome refractories especially, study on the kinetics and mechanism of sintering, densification behaviour, and various physical, thermo-mechanical properties of compositions in the Alumina - Chrome - Silica (Al2O3-Cr2O3-SiO2) system, optimization of the various controlling parameters along with characterization of the sintered samples in terms of XRD, Microstructural analysis, Hot Modulus of Rupture (HMOR) etc. A review of the previous work done on the Alumina - Chrome - Silica system has been discussed in one of our earlier posts [Refractory Formation in Alumina - Chrome - Silica (Al2O3 - Cr2O3 - SiO2) System along with the Ternary Phase Diagram].   
In a refractory the mullite phase can be developed by in-situ reaction sintering between the alumina (Al2O3) and silica (SiO2) containing raw materials or can be imparted directly by adding synthetic mullite grains. In the same way, Mullite - Chrome phase (with some Chrome Corundum solid solution) containing refractories can be formed using natural raw materials mainly calcined bauxite (of low iron, low impurity), calcined fireclay and green chrome oxide (ultrafine) with some sintering aid (?) through reaction sintering at a comparatively lower temperature around 1450 - 1500OC. Alternatively, such refractories can be made using synthetic raw materials such as fused alumina, calcined alumina or even synthetic mullite grains in suitable grading along with green chrome oxide (preferably high purity, ultrafine type) homogeneously dispersed throughout the refractory mix (powder). In the later case the firing temperature would be around 1600 - 1650OC with soaking time depending upon the various known factors.
The addition of Chrome (Cr2O3) to alumino-silicate and mullite refractories improves certain high temperature properties of these refractory products. Creep as well as slag corrosion resistances of high alumino-silicate and mullite containing refractories are considerably increased with the addition of Chrome (chromium oxide, Cr2O3) in them. The creep resistance enhancement of high alumino-silicate refractories is attributed to an increase in viscosity for the glassy phase in the bonding matrix due to the addition of Chrome while reasons for the better slag corrosion resistance of chrome - containing (Cr2O3 - containing) high aluminosilicate and mullite refractories are -
(1) Formation of a dense, Cr-spinel (Chrome-spinel) layer at the slag / refractory interface,
(2) Formation of an impermeable layer due to the crystallization of fibrous mullite facilitated by the presence of Cr2O3 in the refractory brick immediately adjacent to the interface which restricted the slag penetration,
(3) Formation of corundum solid solution (Alumina-Chrome corundum solid solution) which increases the inter-granular direct bonding near the interface at 1500OC to 1600OC reinforced the bonding matrix.
Because of these improved properties mullite-chrome refractories and alumina-chrome (Al-chrome) refractories have been found to perform better than the conventional refractories in furnace hearth areas of lead-zinc smelter and in secondary steel making processes such as in slide-gate refractory assemblies (nozzles, well blocks, porous plug seating blocks etc.) in the steel industry. Laboratory data have shown exceptional resistance to corrosion of these refractories to highly siliceous slag along with better results for these refractories containing mullite-chrome phase from coal gasifier, fiber glass tank furnace, and carbon reactors.              
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