Tecnored Process for Ironmaking Apr30

Tecnored Process for Ironmaking...

Tecnored Process for Ironmaking Tecnored process was developed by ‘Tecnored Desenvolvimento Tecnológico S.A.’ of Brazil and is based upon a low pressure moving bed reduction furnace which reduces cold bonded, carbon bearing, self-fluxing, and self-reducing pellets. Reduction is carried out in a short height shaft furnace of distinct design at typical reduction temperatures. The process produces hot metal (liquid iron). Tecnored technology has been conceived and developed to be a ‘coke-less’ ironmaking process, thus avoiding the investment and operation of environmentally harmful  coke ovens besides significantly reducing green-house gas emissions in the production of hot metal. Tecnored process uses a combination of hot and cold blast and requires no additional oxygen. It eliminates the need for coke plants, sinter plants, and tonnage oxygen plants. Hence, the process has much lower operating and investment costs than those of traditional ironmaking routes. Tecnored process is flexible with regard to the type of iron bearing and carbon bearing raw materials which it can process. The ability of the process to smelt either pellets or briquettes, or even mixed charges of both, provides means of using a wide range of alternative feed materials. The process has got good productivity and high energy efficiency. Tecnored process is also being claimed to be suitable for producing ferro alloys such as ferro manganese. History of development The history of the development of the Tecnored process comprises different phases with different goals, testing a wide range of raw materials and using distinct sizes and concepts of the reactor. During the period 1979 to 1985, development activities were carried out regarding the use of pyrite cinder containing self-reducing pellets as metallic burden in cupola furnaces. This concept of self-reduction was adapted to develop the new process.  In 1985 the concept of the Tecnored...

Technologies for Improving Blast Furnace Operating Performance Oct03

Technologies for Improving Blast Furnace Operating Performance...

Technologies for Improving Blast Furnace Operating Performance A blast furnace (BF) is an investment in the future. Hence it is necessary that there is the proper dimensioning of all equipment, systems and components as well as incorporation of technologies which assure the desired production and quality so that improved performance of the blast furnace can be achieved. This is particularly true when blast furnace goes for capital repairs. During capital repairs incorporation of technologies for the improvement of blast furnace operating performance also meet the new demands placed on the performance of the blast furnace, personnel safety, lower maintenance requirements and environmental compliance. A key challenge for blast furnace operators has always been to assure a continuous and reliable supply of hot metal for the steel melting shop at uniform quality and at the lowest possible costs. Any interruption in the production of hot metal can lead to potential standstills in the downstream production and processing facilities. Downtime must be kept to a minimum while the blast furnace campaign life must be extended for as long as possible. Fluctuations in blast furnace operating parameters must be avoided for uniform hot metal quality, which is only possible through the application of proper technologies as well as sophisticated automation and process control solutions. There are several technologies (Fig 1), which when adopted greatly improve blast furnace operating performance and increase its efficiency both with respect to productivity and fuel consumption. This results into improved hot metal production rate per unit of volume of blast furnace and reduced consumption of BF coke. Some of the major technologies are described below. Fig 1 Technologies for improving BF operating performance Increase in furnace internal volume By using advanced technologies for furnace refractory lining and furnace cooling, it is possible...