A method for removing channel steel slag at the bottom of rh vacuum chamber

Abstract

The invention provides a method for removal of RH vacuum chamber bottom channel steel slag. Heat release of an aluminum oxygen reaction process is utilized to perform melting removal on steel slag. The method consists of: preheating: controlling an oxygen lance's position at 5000-5600mm and the gas flow at 400-500m<3> / h, performing baking for 10-20min until steel slag begins to drip at a bottom channel, then raising the ascending gas flow to 120-150m<3> / h; aluminum adding: using an aluminum alloy hopper to add 100-200kg of aluminum wire segment to the vacuum chamber bottom channel position; and slag melting: controlling the oxygen lance's position at 5000-5600mm and the gas flow at 400-600m<3> / h, further performing baking for 5-20min until the aluminum wire segment added into the bottom channel burns and the steel slag melts, and at the end of the aluminum wire segment reaction, adjusting the ascending gas flow to 80-120m<3> / h. The method provided by the invention can realize online removal of bonded steel slag at the bottom of the RH vacuum chamber bottom channel, thereby effectively reducing the RH circulating pipe hang slag, expanding the circulation pipe inner diameter, increasing the RH molten steel circulation velocity, and ensuring the product quality reliable guarantee.

Description

technical field [0001] The invention belongs to the field of steelmaking technology, in particular to an online method for removing steel slag from a channel at the bottom of a vacuum chamber of an RH (vacuum circulation degassing furnace). Background technique [0002] RH vacuum treatment is a multifunctional secondary refining method that can effectively improve the quality of molten steel. The RH furnace has multiple functions such as decarburization, deoxidation, dehydrogenation, denitrogenation, oxygen blowing, temperature rise, removal of inclusions and fine-tuning of components. The production of steel provides the necessary technological equipment and technical means. [0003] The RH vacuum chamber consists of a bottom tank, a middle tank and a hot top cover. The bottom tank includes a tank body, a circulation tube and an insertion tube. The circulation pipe and the insertion pipe are in contact with molten steel when processing molten steel, and are in contact with...

AI Technical Summary

Problems solved by technology

At the same time, the thicker the steel slag, the smaller the inner diameter of the circulation pipe, the lower the circulation flow rate, and the difficulty in guaranteeing the quality of molten steel

At present, the method of processing these steel slags is mainly to use high-temperature boiling steel to rinse the bottom tank of the vacuum chamber, but affected by the production plan, the RH vacuum chamber continuously produces killed steel, resulting in the smaller the inner diameter of the circulation pipe.