Suspension smelting method and suspension smelting nozzle

Abstract

The invention provides a suspension smelting method. According to the method, the heating speed and the reaction speed of materials are increased by a central backflow area and/or an external backflow area as well as grading reaction; by the aid of higher cyclone intensity, mixing uniformity of the materials and oxygen-enriched air is improved, and the suspension time of the materials in a reaction tower is increased; metallurgy reaction proceeding and sufficient reaction are promoted remarkably, the productivity of a flash furnace is improved, and suspension smelting of concentrate containing high impurities is realized better. The invention further provides a suspension smelting nozzle for implementing the suspension smelting method.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal smelting, in particular to a spin-float smelting method and a spin-float smelting nozzle. Background technique [0002] In the non-ferrous metal smelting industry, especially the copper smelting industry, the suspension flash smelting technology is one of the most important smelting technologies. Spray into the reaction tower of the flash furnace; then the solid powdery materials required for the dried metallurgical reaction, usually including concentrate, flux and return materials, are sprayed into the reaction tower of the flash furnace through the smelting nozzle; the solid powder After the solid material and oxygen-enriched air are ejected from the nozzle, they mix with each other to form a gas-material mixed fluid. The solid powder material is suspended in the space in the reaction tower filled with oxygen-enriched air and has a high oxygen potential, so that the material particles ...

AI Technical Summary

Problems solved by technology

[0004] As we all know, the flash furnace structure, nozzle structure and smelting method in suspension flash smelting are all designed for processing high-quality concentrates, which are not suitable for processing low-grade and / or high-impurity concentrates: when suspending When flash smelting low-grade copper concentrates, the content of the target metal copper in the copper concentrates is low, which means that the content of low-valence sulfur elements in the copper concentrates is higher, and the low-valence sulfur elements are equivalent to metallurgical reactions The fuel in the furnace will generate more heat under the same feeding amount of copper concentrate, which will cause the furnace temperature to be too high, and the furnace body will bear a higher heat load, which will reduce the service life of the furnace body, thus limiting the suspension flash smelting process. The capacity of high-grade copper concentrate; when suspension flash smelting copper concentrate with high impurities, the content of impurity elements such as lead, zinc, arsenic, antimony, bismuth and / or tin in the copper concentrate is high, and these impurities will be reduced The heating rate of copper concentrate increases the reaction temperature of copper concentrate and reduces the reaction speed of copper concentrate, which will easily cause incomplete metallurgical reaction and reduce the production capacity of flash furnace, thus limiting the suspension flash smelting process of high impurities Copper Concentrate Capacity

In actual production, the current suspension flash smelting method and the suspension flash smelting nozzle cannot realize the smelting of low-grade and / or high-impurity concentrates well

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