A reverse smelting smelting method, nozzle and metallurgical equipment

Abstract

The invention discloses a reverse spin floating smelting method. Powdery sulfide concentrate and oxygen-containing gas are sprayed into a space of a high-temperature reaction tower through equipment. The oxygen-containing gas is divided into two parts before entering the equipment; the second oxygen-containing gas is sprayed into the reaction tower in an annular rotary flow mode to form a bell-shaped rotary air curtain; the first oxygen-containing gas is converted into rotary jet via the equipment and is injected from the center of the rotary air curtain. In the annular space between the two rotary gas flows, the concentrate enters in the direction deflecting to the center, and is drawn in by the oxygen-containing gas while high-temperature flue gas from the lower portion of the reaction tower is sucked to form two-phase rotary jet of gas-particle mixing. When the sulfide concentrate is lighted at high temperature, the sulfide concentrate generates severe combustion reaction with oxygen and releases flue gas rich in SO2, meanwhile, sulfonium (or metal) and slag containing mixed melt is formed, and finally the sulfonium (or metal) is separated from the slag at the bottom of the reaction tower so as to complete the metallurgy process. The invention further provides the metallurgical equipment and a reverse spin floating smelting nozzle thereof.

Description

technical field [0001] The invention relates to the technical field of nonferrous metallurgy, in particular to a method and equipment for smelting concentrate powder containing metal sulfides such as copper, nickel, lead and zinc to obtain sulfur and even metal products. Background technique [0002] In the pyrometallurgical industry, smelting sulfide concentrate is the process of using the sulfur and iron in the sulfide ore to react with oxygen and finally be removed to obtain metals. The pyrometallurgical process can be roughly divided into two categories: molten pool smelting and space smelting. The essence of space suspension smelting is to use the huge surface area of ​​dried powdery sulfide ore to fully combine material particles with oxygen. seconds) to complete the oxidation reaction. The most widely used space suspension smelting is the Outokumpu flash smelting invented by Finnish scientists in 1949. The core of the process is the direct current injection technolog...

AI Technical Summary

Problems solved by technology

However, the above-mentioned method has the following problems in production practice: due to the excessive entrainment of the cyclone fluid, a large amount of high-temperature flue gas after the reaction is returned to the top of the reaction tower, causing the loss of the top of the reaction tower to be too fast; for individual concentrate particles, the Physical specifications, specific gravity, chemical composition and other properties are quite different. The swirl intensity can be adjusted but it is difficult to control. If it is too small, it is not enough to drive the particles to rotate. If it is too large, flashing will appear and damage the furnace body; the reaction gas flows from the inside to the outside. Diffusion, when reaching the outer ring of the material ring, most of the oxygen has been consumed, resulting in the concentrate particles in the outer ring of the material ring cannot be oxidized

Images