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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BOF heat sizes in the U. 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. After the war, the Germans were denied the right ocigeno manufacture tonnage oxygen, but oxygen plants were shipped to other countries.

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Basic Oxygen Steelmaking is unquestionably the “son of Bessemer”, the original pneumatic process patented by Sir Henry Bessemer in Once vessel maintenance is complete the vessel is ready to receive the next charge. The gases are then cooled and cleaned either in a wet scrubber or a dry electrostatic precipitator. The economics and handling facilities dictate the selection at each shop.

After tapping steel into the ladle, and turning the vessel upside down and tapping the remaining slag into the “slag pot”, the vessel is returned to the upright position.

bascio 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 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. In contrast the U. The rate of solution of a refractory by the slag is dependent on its properties. There exist several variations on the BOS process: As a result, Bessemer’s steel suffered from both “hot shortness” due to sulfur and “cold shortness” due to phosphorus that rendered it unrollable.

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The iron oxide, FeO, content of the bath increases with blowing time especially as the carbon in the steel falls below 0.

The BOS has been a pivotal process in the transformation of the U. The original bricks were tar bonded, where the MgO grains were coated with tar and pressed warm represented a great step forward for the BOS process.

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Limestone, scrap, and sponge iron are all potential coolants that can be added to a heat that has been overblown and is excessively hot. As a consequence, ladle sizes remained unchanged in the renovated open hearth shops and ingot pouring aisles were built in the new shops. Charging takes a couple of minutes. 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.

Fuentes, Hervey Zamora G.

The gas is primarily carbon monoxide CO from the carbon in the hot metal. This study will focus only on the top blowing variation. None of the above would be significant however, without the improvements in quality and type of basic brick available to the industry. First they combine with SiO2 which is oxidized from the hot metal to form a “basic” slag that is fluid at oxiheno temperatures. Carbon is added as pitch tar or graphite.

Near the end of a campaign, gunning with refractory materials in high wear areas may also be necessary. This is soon muffled as silicon from the hot metal is oxidized forming silica, Horn 2which reacts with the basic fluxes to form a gassy molten slag that envelops the lance.

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Fluxes serve two important purposes. This saturates the slag with MgO, thus reducing chemical erosion of the MgO vessel lining.

Soft burned fluxes form slag more horon than hard-burned, and in the short blowing cycle, this is critical for effective sulfur and phosphorus removal. A ton BOF today needs about 20 tons of pure oxygen every 40 minutes. In many shops residual slag is blown with nitrogen to coat the barrel and trunion areas of the vessel. 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.

Section through the BOF vessel during oxygen blowing. They are obtained by calcining the carbonate minerals, generally offsite in rotary kilns. Flat rolled scrap is generally of good quality and it’s impact on the chemistry of BOF operations can almost be ignored.

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The new process was officially dubbed the “LD Process” and because of its high productivity was seen globally as a viable, low capital process by which the war torn countries of Europe could rebuild their steel industries. Japan switched from a rebuilding plan based on open hearths to evaluate the LD, and installed their first unit at Yawata in Basic Oxygen Furnace Steelmaking. These were eroded to form a basic slag that absorbed phosphorus and sulfur, although the amounts remained high by modern standards.

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