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Oxygen-enriched side-blown reduction molten pool smelting furnace and method for smelting tin by using tin-enriched complex material in smelting furnace

A molten pool smelting furnace and smelting furnace technology, applied in the field of non-ferrous metal smelting, can solve the problems of high energy consumption, low processing capacity, and unorganized emission of smoke in electric furnaces, and achieve the effect of improving economic benefits

Inactive Publication Date: 2012-05-02
个旧市富祥工贸有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art smelting method mainly has the following disadvantages: 1. The processing capacity is low, and the reverberatory furnace 1~1.5T / m 2 d, electric furnace 2.5~4T / m 2 d
2. The unorganized emission of flue gas is serious, causing great environmental pollution
3. The electric furnace has high power consumption and strong reducing atmosphere, so it is only suitable for processing low-iron and tin-containing materials
4. The blast furnace material preparation process is complicated; expensive metallurgical coke must be used
The electric furnace uses the graphite electrode inserted into the material to heat the material to reduce and smelt the metal, and produces a thick tin alloy, but the electric furnace consumes a lot of graphite electrodes, the energy consumption is high, the processing capacity is low, and the hearth capacity is only 2.5~4T / m 2 d

Method used

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  • Oxygen-enriched side-blown reduction molten pool smelting furnace and method for smelting tin by using tin-enriched complex material in smelting furnace
  • Oxygen-enriched side-blown reduction molten pool smelting furnace and method for smelting tin by using tin-enriched complex material in smelting furnace
  • Oxygen-enriched side-blown reduction molten pool smelting furnace and method for smelting tin by using tin-enriched complex material in smelting furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The tin-rich material contains Sn40%, Pb3%, FeO22%, add 15% reduced coal, and mix with quartz stone according to the silicic acidity of the slag of 0.9, and make 10~40mm pellets by the granulator, and send them to the oxygen-enriched side blowing Reduction bath smelting furnace; O is fed into the primary tuyere 2 Oxygen-enriched air with a concentration of 50%, the pressure of the primary tuyere is 0.16Mpa, the wind speed is 250m / s, the bituminous coal is adjusted, and the value of the oxygen excess coefficient α is controlled to be 0.6~0.7 in the feeding stage, 0.4~0.5 in the reducing stage, and 0.8~0.9 in the discharging stage ; Fully burn the bituminous coal, heat the melt and keep the melt temperature at 1250°C, control the reducing atmosphere in the melting pool of the smelting furnace, make the tin oxide reduction reaction for 55 minutes, and generate coarse tin, slag and smoke; send the liquid slag into the oxygen-enriched tin Fuming furnace, through O 2 Oxygen-...

Embodiment 2

[0037] The tin-rich material contains Sn30%, Pb13%, FeO26%, add 18% reduced coal and quartz stone to mix according to the silicic acidity of slag 0.8, and make 10~40mm pellets by granulator, and send them into oxygen-enriched side blowing reduction Melting pool melting furnace; O is fed into the primary tuyeres 2 Oxygen-enriched air with a concentration of 25%, the pressure of the primary tuyere is 0.08Mpa, the wind speed is 150m / s, the bituminous coal is adjusted, and the value of the oxygen excess coefficient α is controlled to be 0.55~0.65 in the feeding stage, 0.35~0.5 in the reducing stage, and 0.8~0.9 in the discharging stage ; Fully burn the bituminous coal, heat the melt and keep the melt temperature at 1050°C, control the reducing atmosphere in the molten pool of the smelting furnace, make the tin oxide reduction reaction for 45 minutes, and generate crude tin, slag and smoke; send the liquid slag into the oxygen-enriched tin Fuming furnace, through O 2 Oxygen-enrich...

Embodiment 3

[0039] The tin-rich material contains Sn25%, Pb18%, FeO27%. Add 20% reduced coal and quartz stone to mix according to the silicic acidity of the slag to 1.0, and make 10~40mm pellets by the granulator, and send them to the oxygen-enriched side blown reduction Melting pool melting furnace; O is fed into the primary tuyeres 2 Oxygen-enriched air with a concentration of 35%, primary tuyere pressure of 0.14Mpa, wind speed of 200m / s, adjusting bituminous coal, and controlling the oxygen excess coefficient α value in the feeding stage 0.55~0.65, reducing stage 0.35~0.5, and discharging stage 0.8~0.9 , to fully burn the bituminous coal, heat the melt and keep the melt temperature at 1150°C, control the reducing atmosphere in the melting pool of the smelting furnace, make the tin oxide reduction reaction for 50 minutes, and generate coarse tin, slag and smoke; send the liquid slag into the oxygen-enriched tin Fuming furnace, through O 2 Oxygen-enriched air with a concentration of 25%...

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Abstract

The invention discloses an oxygen-enriched side-blown reduction molten pool smelting furnace and a method for smelting tin by using a tin-enriched complex material in the smelting furnace. The smelting furnace comprises a furnace body, a furnace cylinder, a molten pool, a furnace liner and a water jacket; a slope-shaped furnace bottom is arranged in the furnace cylinder; and the chromium magnesium brick furnace liner is arranged on the furnace liner in the middle of the furnace body. The method comprises the procedures of mixing, granulating, oxygen-enriched reduction smelting, slag fuming treatment and recycling of tin-containing smoke. By adopting an oxygen-enriched side-blowing technology in the oxygen-enriched side-blown tin reduction molten pool smelting furnace, the melt in the furnace is kept in a high-temperature molten state; by intensively bubbling and stirring the melt, liquid, solid and gas phases are quickly reacted; and when the tin metal is coagulated and grown into liquid drops of 0.5 to 5 millimeters, the tin metal quickly sinks and is demixed with the slag, so that the capacity of the furnace bed is improved to 100T / m<2>.d. When 10,000 tons of crude tin is produced, only one oxygen-enriched side-blown smelting furnace of 800kVA.2m<2> is needed; and by using lignite as a fuel, the smelting furnace is energy-saving and environment-friendly, and the work efficiency of the smelting furnace is improved by 5 to 10 times compared with the prior art. The recovery rate of tin is more than 95 percent, the smoke rate of the oxygen-enriched tin reduction furnace is controlled to be 10 to 15 percent, and the tin content of the slag of the oxygen-enriched tin fuming furnace is less than 0.1 percent.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal smelting, and specifically relates to an oxygen-enriched side-blown reduction molten pool smelting furnace and a method for smelting tin from complex tin-rich materials based on an oxygen-enriched side-blown reduction molten pool smelting process with simple process and stable and reliable operation . Background technique [0002] Smoke produced from fuming furnaces containing 15-50% tin, other non-ferrous metals such as zinc, antimony, and lead 10-30%, and tin-lead symbiotic ores containing 5-30% tin, and recycled from old household appliances The regenerated tin secondary material contains 5-60% tin, and this kind of raw material is called tin-rich multi-metal oxide raw material. Reduction smelting in the prior art includes traditional blast furnace, reverberatory furnace and electric furnace smelting, as well as the Osmelt smelting method of enhanced molten pool smelting technology. ...

Claims

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Application Information

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IPC IPC(8): C22B25/02
Inventor 李果谢官华吴建民刘勇
Owner 个旧市富祥工贸有限责任公司
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