A wind-coal blowing furnace and a method for smelting brittle sulfur-lead-antimony ore using the wind-coal blowing furnace

Abstract

The invention discloses an air-coal blowing furnace and a method for smelting brittle sulfur-lead-antimony ore by using the air-coal blowing furnace, belonging to the technical field of nonferrous metal metallurgy. The air-coal blowing furnace includes a furnace body, a feed inlet, an air-coal inlet, an alloy outlet, a slag outlet and a smoke outlet. The furnace body is in the form of a column, and the bottom of the furnace body is conical. In the slag-depleted area, the top of the furnace body corresponding to the smelting area is provided with a feed inlet, the side of the furnace body corresponding to the slag-depleted area is provided with a smoke outlet, and the conical bottom of the furnace body is provided with an alloy outlet, and the slag in the furnace body is formed The slag line, near the horizontal line of the slag line and the side of the furnace body on the same side as the smoke outlet, is provided with a slag port, and the front and rear sides of the furnace body between the slag port and the alloy outlet are symmetrically provided with air coal ports. And the brittle sulfur-lead-antimony ore is smelted directly by using the air-coal blowing furnace. The invention overcomes the defects of the existing brittle sulfur-lead-antimony ore smelting method, shortens the smelting process, improves the metal recovery rate, saves production costs, and improves the working environment.

Description

technical field [0001] The invention relates to an air-coal blowing furnace and a method for smelting brittle sulfur-lead-antimony ore by using the air-coal blowing furnace, belonging to the technical field of nonferrous metal metallurgy. Background technique [0002] my country is very rich in antimony ore resources, with metal reserves of about 2.2 to 2.5 million tons, ranking first in the world and accounting for 52% of the world's total reserves. In recent years, due to the super-intensive mining of antimony ore, mining the rich and abandoning the poor, the resources of antimony ore are seriously wasted, resulting in less and less single antimony ore reserves, while the relative increase of complex lead-antimony ore and the associated complex lead-antimony ore mining volume are increasing. Large and complex lead-antimony ores replace single antimony ores to produce lead, antimony metals and their products, which has become the development trend of my country's antimony in...

AI Technical Summary

Problems solved by technology

The advantage of the chlorination-hydrolysis method is that the process is short, and it is easy to realize industrial production. The disadvantage is that the direct recovery rate of antimony is low (about 84%), and the amount of waste water is large. Even if the waste water is treated, it is difficult to reach the national standard, so it is not suitable for large-scale production. industrial production

Fluidized roasting-sintering-blast furnace smelting-blow smelting process to process brittle sulfur-lead-antimony ore has to go through processes such as concentrate roasting, calcine sintering, blast furnace smelting, etc., which makes the whole process too lengthy, and the separation of lead and antimony is difficult in fuming blowing. As a result, the recovery rate of lead in the whole treatment process is generally about 70%, and the recovery rate of antimony is about 60%, which seriously affects the value of its application.

In addition, this method produces SO with a concentration ranging from 0.15% to 2.5% during the roasting desulfurization process. 2 Exhaust gas, most smelting enterprises use this low concentration SO 2 Exhaust gas is directly emptied, seriously polluting the environment

Some smelters use lime or ammonium bicarbonate to absorb this waste gas, but the alkali slag produced during the absorption process is toxic and water-soluble, which poses a serious threat to the environment and people, and is still an unsolved technical problem.

In terms of economy and low carbon, it can be said that this method is unreasonable

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