New process for smelting tin in side-top-blowing molten pool and smelting furnace

Abstract

The invention discloses a new process for smelting tin in a side-top-blowing molten pool and a smelting furnace, and belongs to the technical field of metal smelting. By adopting the new new process for smelting the tin in the side-top blowing molten pool, the oxygen enrichment concentration is high, amount of air entering a furnace is reduced, the concentration of pollutants such as sulfur dioxide in flue gas is improved, subsequent desulfurization treatment is facilitated, emission of the pollutants is greatly reduced, less heat is taken away by the flue gas, and smelting comprehensive energy consumption is reduced; a top wall spray gun shortens the blow-in time, the molten pool is rapidly manufactured, a tin-iron alloy layer at the bottom is moved and stirred up and down to serve as a reducing agent to participate in a weak reduction reaction in next stage, the consumption of reducing coal is reduced, ethylene is not generated, and the crude tin refining technological process is shortened; the oxygen-enriched air strongly stirs the molten pool, and metallurgical dynamic conditions are strengthened to the maximum extent, unit hearth area treatment capacity is improved, and tin recovery rate is high. The smelting furnace adopted by the novel process for smelting the tin in the side-top blowing molten pool can be used for rapidly manufacturing the molten pool, and is high in oxygen enrichment concentration, low in energy consumption, small in flue gas emission and long in service life of a furnace body.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and in particular relates to a new technology for smelting tin in a side-top blowing molten pool and a smelting furnace. Background technique [0002] At present, my country's tin smelting process mainly includes electric furnace smelting, reverberatory furnace smelting and imported Osmelt furnace smelting. [0003] Electric furnace smelting has strong adaptability to raw materials, especially for tin concentrates with high melting points such as tungsten, tantalum, and niobium. It is suitable for tin concentrates containing more than 5% iron. [0004] Reverberatory furnace smelting is a traditional tin smelting method and the most widely used tin concentrate reduction smelting equipment. It has the advantages of low investment cost, simple structure, convenient operation, and strong raw material applicability. However, with the progress of other smelting technologies, such as Compared w...

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Problems solved by technology

[0003] Electric furnace smelting has strong adaptability to raw materials, especially for tin concentrates with high melting points such as tungsten, tantalum, and niobium. Suitable for tin concentrates containing more than 5% iron

[0004] Reverberatory furnace smelting is a traditional tin smelting method and the most widely used tin concentrate reduction smelting equipment. It has the advantages of low investment cost, simple structure, convenient operation, and strong raw material applicability. However, with the progress of other smelting technologies, such as Compared with flash smelting and molten pool smelting technology, there are inherent disadvantages such as low hearth energy rate, low heat utilization rate, high labor intensity, poor environmental protection conditions, poor technical and economic indicators, etc.; at the same time, as the grade of tin concentrate decreases, impurities The composition is complex and the content is high. The smelting process produces ethyl tin and a high rate of hard ends, resulting in a very long subsequent refining process and high smelting costs.

[0005] The imported Osmelt tin smelting process has the common advantages of molten pool smelting, such as high bed energy rate and low energy consumption, but the cost of introducing this process technology is high, the service life of the spray gun is only 5 to 7 days, and the oxygen concentration is only 30%, the furnace life is only 1 to 2 years

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