NEWS REVIEW
NALCO interested in sourcing technology supplier for gallium extraction plant
National Aluminium Company Ltd (NALCO) is interested in sourcing a suitable and low cost technology supplier for setting up a gallium extraction unit/ plant in the company’s Alumina Refi nery located at Damanjodi, Odisha through a Joint Venture or standalone having gallium metal purity of ≥ 99.99 % (4N+). The capacity of the plant will be of around ten tonnes per annum, low cost and economically viable with state of the art environment friendly technology environment standard.
For this purpose NALCO invites Expression of Interest (EOI) from interested and competent manufacturers, and technology suppliers interested in providing technology for extraction of gallium from Nalco Bayer liquor (intermediate process liquor generated from Digestion of bauxite by the “Bayer” process) and having expertise in production and marketing of metallic gallium or gallium compounds.
On receiving proposals from the parties again, a fresh tender will be fl oated to the shortlisted parties for selection of the suitable technology provider on gallium extraction from Bauxitic resources. NALCO was incorporated in 1981 following a major investment decision by the Government of India to exploit a part of the Bauxite deposit discovered in the East Coast of India.
The company says it has charted an excellent track record in both physical and fi nancial performance, and has been listed in the LME (London Metal exchange).Recently, the company was conferred the “Nav Ratna”(literally Nine Jewels} by the Government of India, in recognition of its consistent performance over the years, hereby incorporating higher investment and operational autonomy.
NALCO is operating a multi-location Bauxite Mines-Alumina-Aluminium complex along with a Captive Power Plant, in the State of Odisha, India. A major expansion programme (1st phase) was completed in 2001. The Phase-2 expansion was fi nished in July, 2012 and upgrading activity of the Refi nery after Phase 2 expansion been completed.
Mines up-gradation is currently ongoing. The company is listed on National Stock Exchange of India and Mumbai stock exchange.
The process of extraction of Alumina from its mineral bauxite in caustic liquor solution is commonly known as the “Bayer” process. Bauxite received from Mines is either stacked in stock pile or fed directly to secondary crusher for size reduction. Secondary crushed bauxite from Silo is fed to Ball Mill along with caustic liquor for grinding. Ground bauxite slurry after Pre-desilication
is digested at atmospheric pressure (temperature 105 - 106 degree C) for extraction of alumina.
Undigested bauxite is separated as Red mud. Aluminate liquor is cooled to precipitate ATH (alumina trihydrate) which is calcined to produce alumina. The gallium dissolves in the liquid phase and get enriched with time as NALCO is not extracting gallium metal or any compound till now. But some amount of gallium is escaping from the plant liquor during discharge of red mud as well as with product alumina.
Microsemi launches new family of SiC MOSFETs for high-voltage and industrial applications
MICROSEMI CORPORATION have introduced its new silicon carbide MOSFET product family with 1200 V solutions. The new SiC MOSFETs are designed for high-power industrial applications where effi ciency is critical. These applications include solutions for solar inverters, electric vehicles, welding and medical devices.
The company is positioned to capitalize on SiC semiconductor market growth. Market researcher Yole Développement estimates that the SiC power semiconductor market will grow 39 percent year-over-year from 2015 to 2020, and Market Research estimates the SiC semiconductor market will grow 38 percent year-over-year to $5.3 billion by 2022.
The new SiC MOSFETs provide patented technology from Microsemi and are designed to help customers develop solutions that operate at higher frequency and improve system effi ciency.
Microsemi’s patented SiC MOSFET technology features include: Best- in-class RDS(on) vs. temperature; ultra-low gate resistance for minimizing
switching energy loss; superior maximum switching frequency; and outstanding ruggedness with superior short circuit withstand.
“Microsemi’s 1200V SiC MOSFETs are establishing a new benchmark for performance,” said Marc Vandenberg, general manager for Microsemi’s Power Products Group. “Microsemi continues to expand its SiC product portfolio by capitalizing on our in- house SiC fabrication capabilities and delivering innovative high-power solutions to our customers.”
Microsemi’s 1200V SiC MOSFETs are rated at 80 milliohms and 50 milliohms and provide customers more development fl exibility by offering both industry standard TO-247 and SOT-227 packages.
SiC MOSFETs are also integrated into the company’s expanded MOSFET power modules, which are used in battery charging, aerospace, solar, welding and other high-power industrial applications. The new power modules provide higher frequency operation and improve system effi ciency.
June 2014
www.compoundsemiconductor.net 7
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