Furnace top blowing redox method for refining furnace

Abstract

The invention discloses a top-blowing oxidation reduction method for a refining furnace, which comprises the following steps: firstly, inserting a top-blowing spray gun into the refining furnace from a spray gun hole of a refining furnace body through a lifting device, and then connecting the top-blowing spray gun with a gas supply metal hose to complete equipment installation; when crude copper melt enters a refining furnace, a top-blowing spray gun is used for blowing oxygen for combustion supporting and heat preservation, when the crude copper melt in a furnace body of the refining furnace reaches 300 t or above, a crude copper melt sample is taken for oxygen and sulfur content analysis, needed oxidation time and gas flow are calculated, then compressed air and oxygen-enriched air are introduced into the top-blowing spray gun for oxidation, and after oxidation is finished, oxygen and sulfur in the top-blowing spray gun are removed. Natural gas is introduced through the top-blowing spray gun for top-blowing reduction, and after reduction is finished, the top-blowing spray gun is switched to be subjected to heat preservation. According to the top-blowing redox technology, the use frequency of redox mouth and furnace mouth bricks is reduced, the service life of the bricks in a vulnerable area is prolonged, efficient and long-period stable operation of the refining furnace is achieved, the frequency of overhaul and maintenance is reduced, and materials and overhaul cost are saved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a top-blown oxidation-reduction method for a refining furnace. Background technique [0002] The flash blowing process is a suspension reaction, and the sulfur content of blister copper is relatively high (about 0.1%). The refining furnace can only carry out pre-oxidation (about 2 hours) by using the gap between materials after feeding to 300t, and formal oxidation is required after feeding. 3h to restore. When the sulfur content of blister copper is higher than 0.1%, the oxidation time will be longer. [0003] At present, the oxidation-reduction method of refining furnace is mainly based on masonry redox port and pre-formed redox port. The brick body and redox gun are immersed under the copper liquid, and the blown compressed air and reducing agent are in direct contact with the copper liquid. A redox reaction then occurs. The erosion and wear of the brick body in this are...

AI Technical Summary

Problems solved by technology

The erosion and wear of the brick body in this area is particularly serious, and the service life of the brick body is only about 1 month. When the redox time is prolonged, the service life will be reduced

At the same time, the refining furnace uses a dilute oxygen combustion system for heating, and natural gas and oxygen are blown in from the end wall to keep warm and heat up. Because the furnace of the refining furnace is large, the position of the flame will change when the refining furnace is in different operating positions, resulting in The burning loss of cylinder bricks at the position is relatively serious, which affects the life of the refining furnace

Images