Reduction and volatilization smelting method of a composite fuel fuming furnace

Abstract

The invention relates to a composite fuel fuming furnace reduction and volatilization smelting method and belongs to the technical field of thermometallurgy. The method comprises the steps that pulverized coal and natural gas are adopted as a composite fuel of reduction and volatilization smelting of a fuming furnace, the natural gas is sprayed into the fuming furnace through natural gas spray nozzles, the pulverized coal and primary air are blended in a pulverized coal fuel supply system and then sprayed into the fuming furnace through pulverized coal spray nozzles; and in the reduction and volatilization smelting process, the pulverized coal spray amount and the natural gas spray amount are regulated according to the situation of cold and hot materials of the fuming furnace. By adoptingthe reduction and volatilization smelting method, the temperature rising speed is high, the fuming furnace is flexible to operate, regulation is easy and convenient, the automation degree is high, andthe problems that supply of the pulverized coal or the fuel gas is interrupted and consequentially slag discharging of the fuming furnace is difficult can be effectively prevented; clean and long-period continuous production and operation can be achieved, reduction and volatilization reaction of the fuming furnace is more thorough, and matching with an upstream and downstream operation system isfacilitated; and the production efficiency is high, production control is stable, and stable and refined production control can be achieved easily.

Description

Technical field [0001] The invention belongs to the technical field of pyrometallurgy, and specifically relates to a reduction volatilization smelting method in a composite fuel fuming furnace. Background technique [0002] Smelting furnace reduction volatilization is a process that uses high temperature conditions to intensify reduction and volatilization. The traditional smoker furnace uses a mixture of air and pulverized coal to blow into the molten slag in the smoker, using the large amount of heat and carbon monoxide generated by the combustion of pulverized coal The gas keeps the furnace at a higher temperature and a certain reducing atmosphere, so that the lead, zinc and other metals in the slag are reduced from their oxides to metal vapor and volatilized, and the metal vapor moves to the upper space of the furnace. The carbon dioxide gas in the furnace or the air inhaled from the tertiary tuyere is oxidized into metal oxides such as PbO and ZnO. These metal oxides enter t...

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Problems solved by technology

[0003] The existing fuming furnace reduction and volatilization smelting technology generally uses a single fuel pulverized coal for production, which has problems such as long heating time, great constraints on coal quality, difficult to achieve fine control of coal supply, unstable smelting process, and prone to dust. Incomplete combustion of coal, and incomplete combustion of pulverized coal will have a great impact on the control of the evaporation of the fuming furnace and the safety of the dust collection system

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