Top and bottom composite blowing molten bath smelting technology and device

Abstract

The invention provides a top and bottom composite blowing molten bath smelting technology and device. A plurality of spray gun insert holes are formed in the top of a furnace body. Feeding inlets anda floss hole are formed in the top of the furnace body and formed in the left and right ends of the furnace body correspondingly. Spray gun insert holes are formed in the bottom of the furnace body. Aslag tap and a copper-matte tap are formed in the two sides of the furnace body correspondingly. A nozzle is formed above the slag tap. The top and bottom composite blowing molten bath smelting technology and device have the advantages that a top blowing unit is additionally arranged at the top of the furnace body, elemental sulfur which is produced due to copper concentrate decomposition and cannot participate in oxidizing reaction completely fully reacts in a smelting furnace, a large amount of the elemental sulfur is prevented from entering a flue gas system, the boiler inlet flue gas temperature is decreased, a coking situation is alleviated, the molten bath smelting heat efficiency is improved, and meanwhile, top blowing high-speed airflow is utilized for reducing the phenomenon ofmelt splashing caused by bottom blowing.

Description

technical field [0001] The invention relates to the field of smelting technology and devices, in particular to a top-bottom composite blowing molten pool smelting technology and device. Background technique [0002] During the high-temperature smelting process in the smelting furnace, the copper concentrate will decompose to produce elemental sulfur (mainly chalcopyrite), and the decomposition temperature of this chemical reaction is low, about 300-550°C. Existing copper melting pool smelting processes, such as Noranda side blowing, Isa top blowing, oxygen bottom blowing, etc., part of the elemental sulfur decomposed during the smelting process will enter the boiler, electric precipitator and other flue gases along with the flue gas. In the gas system, the oxidation reaction continues with the oxygen leaked into the air, and secondary combustion occurs, which not only wastes the chemical energy in the ore material, increases the energy consumption of the smelting process, bu...

AI Technical Summary

Problems solved by technology

Existing copper melting pool smelting processes, such as Noranda side blowing, Isa top blowing, oxygen bottom blowing, etc., part of the elemental sulfur decomposed during the smelting process will enter the boiler, electric precipitator and other flue gases along with the flue gas. In the gas system, the oxidation reaction continues with the oxygen leaked into the air, and secondary combustion occurs, which not only wastes the chemical energy in the ore material, increases the energy consumption of the smelting process, but also causes the temperature rise in the connection area between the waste heat boiler and the smelting furnace. High, intensifies the formation of coking in the flue, and seriously affects the production of the smelting furnace

And the single top-blowing, side-blowing or bottom-blowing smelting process has its own advantages and disadvantages in the smelting process. For example, although the bottom-blowing process has high smelting reaction intensity, it also brings serious melt splashing, and the feeding port and flue port are easy to melt. Bonding and other issues

Images