A side-top blowing molten pool tin smelting process and smelting furnace

Abstract

The invention discloses a new technology for smelting tin in a side-top blowing molten pool and a melting furnace, which belong to the technical field of metal smelting. The invention adopts a new technology for smelting tin in a side-top-blown molten pool, which has a high oxygen-enriched concentration and reduces the amount of air entering the furnace. Increase the concentration of pollutants such as sulfur dioxide in the flue gas to facilitate subsequent desulfurization treatment, greatly reduce the emission of pollutants, take away less heat energy from the flue gas, and reduce the overall energy consumption of smelting; Move and stir the tin-iron alloy layer at the bottom as a reducing agent to participate in the weak reduction reaction in the next stage, reduce the consumption of reduced coal, produce no ethyl tin, and shorten the crude tin refining process; oxygen-enriched air strongly stirs the molten pool to maximize the metallurgical kinetic conditions, The processing capacity per unit hearth area is increased, and the tin recovery rate is high; the smelting furnace adopted in the new process of smelting tin in the side top blowing molten pool of the present invention can quickly build the molten pool, with high oxygen concentration, low energy consumption, and smoke emission The quantity is small, and the service life of the furnace is long.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and particularly relates to a tin smelting process and a smelting furnace in a side top blowing molten pool. Background technique [0002] At present, my country's tin smelting process mainly includes electric furnace smelting, reverberatory furnace smelting and imported Osmet 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. Suitable for tin concentrates with iron content higher than 5%. [0004] Reverberatory furnace smelting is a traditional tin smelting method, and it is also the most widely used tin concentrate reduction smelting equipment. It has the advantages of low investment cost, simple structure, convenient operation and strong applicability of raw materials. 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 5-7 days, and the oxygen concentration is only 30%, the furnace life is only 1~2 years

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