HORNO BASICO DE OXIGENO BOF PDF

Aceración con Hornos Básicos de Oxígeno La refinación del arrabio en el proceso BOF o aceración al oxígeno se lleva a cabo en un recipiente que asemeja. Horno Básico de OxígenoUNIDAD 6 Horno Siemens Martin. Convertidor de Soplado Nariz (N) Lanza de Oxigeno (L) Cintur. The basic oxygen furnace (BOF), whose profile is shown in the figure, is a tiltable vessel lined with refractories such as magnesia carbon brick. Auxiliary.

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S near Reading, PA. Because lime in steel slag absorbs moisture and expands on weathering, its use as an aggregate material is limited, but other commercial uses are being developed to minimize the amount that must be disposed. The process was acknowledged as a breakthrough technically but the timing, scale, and economics were wrong for the time. Primeramente se le agrega al convertidor la chatarra que se encuentra en cajas previamente pesadas.

Scrap selection is further complicated by the wide variety of steel products. Through this lance, oxygen of greater than However, for environmental reasons these types of bricks are no longer used in oxygen steelmaking.

The magnesia lime type refractories used in lining oxygen steelmaking vessels are selected mainly for their compatibility with the highly basic finishing slags required to remove and retain phosphorus in solution. Therefore, thanks to the engineering genius of Alexander Holley, two Bessemer plants were in operation by The high concentrations of FeO formed late in the blow, however, will oxidize the carbon in the brick.

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About half of the systems are open combustion designs where excess air is induced at the mouth of oxigenl hood to completely burn the carbon monoxide. The amount of lime charged depends on the Si content of the hot metal. 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.

In the late s, Professor Durrer in Switzerland pursued his prewar idea of injecting pure oxygen through the top of the vessel. The hot metal is immediately poured directly onto the scrap from a transfer ladle.

None of the above would be significant however, without the improvements in quality and type of basic brick available to the industry. These properties are directly related to the purity and crystal sizes of the starting ingredients as well as the manufacturing process. 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 bod, fume, and slopping.

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Today, the refractory industry is undergoing major structural changes. The future of the BOS depends hornp the availability of hot metal, which in turn depends on the cost and availability of coke. In both cases, the cleaned gases must meet EPA-mandated levels for particulate matter.

The rate of gas evolution is many times the hono of the vessel and it is common to see slag slopping over the lip of oxigeo vessel, especially if the slag is too viscous. NTHM one short ton or pounds of hot metal. These were eroded to form a basic slag that absorbed phosphorus and sulfur, although the amounts remained high by modern standards.

Fumes and kish graphite flakes from the carbon saturated hot metal are emitted from the vessel’s mouth and collected by the pollution control system. Section through the BOF vessel during oxygen blowing.

First they combine with SiO2 which is oxidized from the hot metal to form a “basic” slag that is oxigenoo at steelmaking temperatures. The particulate matter captured in the primary system, whether in the form of sludge from wet scrubbers or dry dust from precipitators, must be processed before recycling. The trend today is to run at high productivity with hogno slag volumes and fuel rates, leading to lower silicon and higher sulfur levels in the hot metal.

The nearby Dolomite Mountains also provided an ideal source of material for basic refractories. Flat rolled scrap is generally of good quality and it’s impact on the chemistry of BOF operations can almost be ignored.

Over the years, there have been numerous operating developments designed to counteract this lining wear: After the war, the Germans were denied the right to manufacture tonnage oxygen, but oxygen plants were shipped to other countries. This slag absorbs and retains sulfur and phosphorus from the hot metal.

Bessemer production peaked in the U. Carbon is added as pitch tar or graphite. This is close to the average heat size for the 50 BOFs which were operable in the U.

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The remainder of U.

All of which makes the purchase and melting of scrap a very complex issue. Bfo refers to the magnesia MgO refractory lining which wears through contact with hot, basic slags.

Typically a fabric collector, or baghouse, is bawico for the collection of these fugitive emissions. These work in conjunction with melter’s eyeballs, which remain the dominant control device. A heat size of tons is used as the basis for the following calculations.

Contratista EPC 5-150 t básica oxígeno industrial horno fusorio BOF

He developed basic linings produced from tar-bonded dolomite bricks. Many steel mills have agreements with manufacturers to buy their prompt scrap. Secondary fugitive emissions associated with charging and tapping the BOF vessel, or emissions escaping the main hood during oxygen blowing, may be captured by exhaust systems serving local hoods or high canopy hoods located in the trusses of the shop or both.

Although it was not recognized at the time, the process made it possible to couple melting with continuous casting. In oxigrno the U. The post combustion of carbon monoxide as it exits the vessel also transmits heat back to the bath. Companies are being continually acquired and the total number of North American suppliers is greatly reduced.

Horno de Oxígeno Básico (HOB) by Carlos Chan on Prezi

This is soon muffled as silicon from the hot metal is oxidized forming silica, SiO 2which reacts with the basic fluxes to form a gassy molten slag that envelops the lance. A lump of soft burned lime dissolves quickly in a cup of water liberating heat. Today’s working lining refractories are primarily resin-bonded magnesia-carbon bricks made with high quality sintered magnesite and high purity flake graphite. The rate of solution of a refractory by the slag is dependent on its properties. Suppressed combustion systems offer the potential for recovery of energy, a practice that is more prevalent in Europe and Japan.