Feeder for pre-dephosphorization of molten iron in iron-storage tap trough and its pre-dephosphorization method

Abstract

The iron-storage type tapping channel for pre-dephosphorization of molten iron feeder and its pre-dephosphorization method include an electric traveling device placed above the tapping channel and reciprocating along the vertical direction of the tapping channel, and a feeding device installed on the electric traveling device. The feeding device, the electric traveling device includes a chassis, traveling wheels and a geared motor that drives the traveling wheels; the feeding device includes a geared motor, a frame, a rotating shaft connected to the geared motor, a conical silo and The detachable feeding cone at the end of the conical silo, the rotating shaft extends into the conical silo, the upper part of the rotating shaft is welded with wear-resistant steel claws, the feeding device is installed vertically with the chassis, the conical silo Through the chassis, the detachable feeding cone extends into the outlet ditch to a depth of 200~400mm from the bottom of the outlet ditch. The dephosphorization reaction time is greatly extended, and there is no splash in the feeding, the feeding amount and speed are easy to control, and the flue gas generated by the reaction can be collected. If the silicon content of the molten iron is high, the feeder is also equipped with an oxygen gun. desiliconization. The whole feeder can walk as a whole, easy to operate, safe and reliable, the whole site operating environment is good, and the effect of pre-dephosphorization of molten iron is stable.

Description

technical field [0001] The patent belongs to the technical field of molten iron pretreatment, and particularly relates to a feeder for pre-dephosphorization of molten iron in an iron-storage tapping trench and a process method thereof. Background technique [0002] Hot metal pretreatment refers to the process of desiliconization, desulfurization or dephosphorization before molten iron is mixed into the steelmaking furnace. Among them, hot metal pretreatment and dephosphorization have a series of advantages. [1] Reduce the phosphorus content in the molten iron, reduce the burden on the converter, reduce the amount of converter slag, save the cost of converter slag making, shorten the converter smelting cycle, and increase the converter output. [2] It can smelt low-phosphorus steel, improve the specification of steel, and improve the quality of steel. [3] The blast furnace raw material can be relaxed, especially iron ore with high phosphorus content can be used. Hot metal pr...

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Problems solved by technology

Chinese patent CN200610088115.6 discloses a production and use method of KR method dephosphorization agent. This type of dephosphorization method must carry out slag removal after dephosphorization, which increases the temperature drop and process time; [2] carry out in the converter Hot metal pretreatment dephosphorization, Chinese patent CN104053794A discloses a method of adding desiliconization agent and dephosphorization agent respectively in the converter and removing slag, the process is complicated and the process time is too long; [3] Pretreatment of molten iron during the transfer process Dephosphorization, Chinese patent CN103667595A discloses a method for high-efficiency dephosphorization of medium and high-phosphorus molten iron in the process of mixing molten iron, adding a dephosphorizing agent to the process of adding iron to the ladle for dephosphorization

There are reports of pre-desiliconizing molten iron by adding a desiliconizing agent to the tap trough, but adding a desiliconizing agent behind the skimmer, and allowing the desiliconizing agent to flow into the ladle with the molten iron for desiliconization, followed by slag removal; [2 】The space in the blast furnace casthouse is very limited, and large equipment such as powder spraying systems are not allowed

Chinese patent CN103215404A discloses a kind of molten iron pretreatment equipment and method, this method designs a kind of powder injection system, sprays remover into molten iron, this method is suitable for ladle, is not suitable for iron ditch, because The space of the casting house is limited, the powder spraying system described in this patent cannot be arranged, and the depth of molten iron at the casting channel is relatively shallow. If the spraying process is used, the utilization rate of the powder will be too low

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