HORNO BASICO DE OXIGENO BOF PDF

El Proceso Primeramente se le agrega al convertidor la chatarra que se encuentra en cajas previamente pesadas. Llenar el horno con los ingredientes se llama carga. Cerca del final del ciclo de soplado, que tiene sobre 20 minutos, la temperatura se mide y se toman muestras. Tocando de acero a partir de BOF: 1. Este proceso se llama tocando el acero.

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In addition, as the tar softened during vessel heat-up, the lining was relieved of expansive stresses. While this represents the loss of a considerable amount of energy about 0. Scrap also comes in many sizes, varying chemical analyses and a variety of prices.

The rate of gas evolution is many times the volume of the vessel and it is common to see slag slopping over the lip of the vessel, especially borno the slag is too viscous. The nearby Dolomite Mountains also provided an ideal source of material for basic refractories. In service, the tar was coked and the residual intergranular carbon resisted slag wetting and attack by FeO. Supreme Court supported lower oxiveno decisions that considered the patent to be invalid.

There were also acrimonious legal actions over patent rights to the process and the supersonic lance design, which was now multihole rather than single hole. The iron oxide, FeO, content of the bath increases with blowing time especially as the carbon in the steel falls below 0. Although it is possible to operate BOFs with reduced hot metal charges, i. Soft burned fluxes form slag more quickly than hard-burned, and in the short blowing cycle, this is critical for effective sulfur and phosphorus removal.

Following pilot plant trials at Linz and Donawitz, a top blown pneumatic process for a 35 ton vessel using pure oxygen was commercialized by Voest at Linz in Some scrap may contain oil or surface oxidation.

It oxidizes the carbon and silicon contained in the hot metal liberating great quantities of heat which melts the scrap. Technical developments over the years include improved computer models and instrumentation for improved turn-down control, external hot metal desulfurization, bottom blowing and stirring with a variety of gases and tuyeres, slag splashing, and improved refractories.

It was also used in the U. Section through the BOF vessel during oxygen blowing. However, with the know-how and capital invested in million tons of open hearth capacity, plans for additional open hearth capacity well along, cheap energy, and heat sizes greater by an order of magnitude versus 30 tonsthe incentive to install this untested, small-scale process in North America was lacking.

A lump of soft burned lime dissolves quickly in a cup of water liberating heat. There are two interesting historical footnotes to the original Bessemer story: These properties are directly related absico the purity and crystal sizes of the starting ingredients as well as the manufacturing process. The lance is water-cooled with a multi-hole copper tip. Kaiser Industries held the U. The result has been that melt shop process and finishing mill quality and yields improved several percent, such that the quantity of raw steel required per ton of product decreased significantly.

Improved Integrated Steel Plant Productivity. Typically a fabric collector, or baghouse, is use for the collection of these fugitive emissions. The metalloids and Mn are oxidized out of the hot metal, the scrap is often coated with Zn which volatilizes, and iron units are lost to the slag, fume, and slopping. Oxygen consumption increases if end-point control is poor and reblows are necessary.

He never developed a commercial process for making steel consistently. The sulfur containing compounds report to the slag; however, unless the sulfur-rich slag is skimmed before the hot metal is poured into the BOF, the sulfur actually charged will be well above the level expected from the metal analysis.

Some dimensions of a typical ton BOF vessel in the U. This study will focus only on the top blowing variation. Through this lance, oxygen of greater than S near Reading, PA. Charging takes a couple of minutes. Further refinements include using prefused grains in the mix.

Basic Oxygen Furnace Steelmaking. Once vessel maintenance is complete the vessel is ready to receive the next charge. The remainder of U.

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HORNO BASICO DE OXIGENO BOF PDF

For his first commercial plant in Sheffield,Bessemer remelted cold pig iron imported from Sweden as the raw material for his hot metal. Once the hot metal temperature and chemical analaysis of the blast furnace hot metal are known, a computer charge models determine the optimum proportions of scrap and hot metal, flux additions, lance height and oxygen blowing time. Sludge from wet scrubbers requires an extra drying step. Bf additives are available to reduce the iron oxide level in the slag but nothing can be done to alter the phosphorus. A ladle full of hot metal is seen to the right. Since these elements cannot be oxidized from the steel, their content in the final product can only be reduced by dilution with very high purity scrap or hot metal. Hard burned material just sits there.

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HORNO BASICO DE OXIGENO BOF PDF

In addition, as the tar softened during vessel heat-up, the lining was relieved of expansive stresses. While this represents the loss of a considerable amount of energy about 0. Scrap also comes in many sizes, varying chemical analyses and a variety of prices. The rate of gas evolution is many times the volume of the vessel and it is common to see slag slopping over the lip of the vessel, especially borno the slag is too viscous. The nearby Dolomite Mountains also provided an ideal source of material for basic refractories. In service, the tar was coked and the residual intergranular carbon resisted slag wetting and attack by FeO. Supreme Court supported lower oxiveno decisions that considered the patent to be invalid.

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HORNO BOF (Horno Basico de Oxigeno)

Bazuru Sludge from wet scrubbers requires an extra drying step. Blowing continues for a predetermined time based on the metallic charge chemistry and the melt specification. While this represents the loss of a considerable amount of energy about 0. The sulfur level from the blast ixigeno can be 0. Obviously the chemical analysis of obsolete scrap is imprecise.

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