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Method for treating high-silicon tin ore by use of oxygen-rich top blowing furnace

An oxygen-enriched top-blowing, high-silicon tin ore technology is applied in the field of high-silicon tin ore smelting, which can solve the problems of high-silicon tin ore difficulty and difficult industrialization of high-silicon tin ore, and achieve the improvement of smelting efficiency and production capacity, and high reduction rate. , the effect of reducing fuel consumption

Active Publication Date: 2020-05-01
YUNNAN TIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Aiming at the problem that high-silicon tin ore is difficult to industrialize, the inventor has provided a method for processing high-silicon tin ore with an oxygen-enriched top-blown furnace through a large number of experimental studies, which can increase the silicon content of tin smelting ore to 1- 10%, and the direct recovery rate of tin is over 77%, and the hearth index reaches 30t / (d˙m 2 ) above, effectively solved the technical bottleneck of the industrialization of high-silicon tin ore

Method used

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  • Method for treating high-silicon tin ore by use of oxygen-rich top blowing furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Mix 20-30% of high-silicon tin ore, 20-40% of tin concentrate, 15-30% of tin dust, and 10-20% of other tin-containing materials. The mixed material index is Sn: 40%, Si : 4%, Fe: 8%, CaO: 7%, others are the balance;

[0032] (2) Send the mixed material in step (1) to the granulator for granulation to make particles with a particle size of 0.5 mm to 30 mm; mix it with lump coal and put it into the furnace. During the smelting process, due to the combustion of the mixed lump coal in the material, A gap is formed between the materials, which can not only fully react with the lump coal, but also ensure that the granular raw materials are fully smelted; at the same time, due to the need to maintain a certain negative pressure in the furnace during the smelting process, this particle size can prevent the material from being sucked under the action of negative pressure. into the dust collection system;

[0033] (3) The granulated material is continuously added to the top-...

Embodiment 2

[0041] (1) Mix high-silicon tin ore, tin concentrate, and tin soot. The mixed material indicators are Sn: 42%, Si: 8%, Fe: 16%, CaO: 3%, and the rest is the balance;

[0042] (2) Mix the mixed material in step (1) with the lump coal and send it to the granulator for granulation to make granules with a particle size of 0.5 mm to 10 mm;

[0043] (3) The granulated material is continuously added to the top-blown furnace for oxygen-enriched smelting. The oxygen-enriched air concentration in the furnace is 30% (vt); first keep coal burning: the mass ratio of the material is 1:15 at 1180±50°C Melting at high temperature for 1.4 hours to complete the melting and ionization cross-reaction of silicates, iron salts, and calcium salts;

[0044](4) Control coal combustion: the material mass ratio is 1:10~15 and the temperature is raised to 1350±50°C. After the temperature is raised, the intake of oxygen-enriched air is reduced, and the oxygen-enriched concentration in the furnace is reduc...

Embodiment 3

[0051] (1) 20-30% of high-silicon tin ore, 20-40% of tin concentrate, 15-30% of tin dust, and 10-20% of other tin-containing materials; the mixed material indicators are Sn: 48%, Si: 10%, Fe: 12%, CaO: 8%, and others are the balance.

[0052] (2) Send the mixed material of step (1) to the granulator after being mixed with the lump coal to make granules with a particle size of 10-20mm;

[0053] (3) The granulated material is continuously added to the top-blown furnace for oxygen-enriched smelting. The concentration of oxygen-enriched air in the furnace is 40% (vt); first keep coal burning: the mass ratio of material is 1:15 at 1250±50°C Melting at high temperature for 1.2 hours to complete the melting and ionization cross-reaction of silicates, iron salts, and calcium salts;

[0054] (4) Control coal combustion: the material mass ratio is 1:10~15 and the temperature is raised to 1450±50°C. After the temperature is raised, the intake of oxygen-enriched air is reduced, the oxyge...

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Abstract

The invention relates to a method for treating high-silicon tin ore by use of an oxygen-rich top blowing furnace and belongs to the technical field of smelting of high-silicon tin ore. The method comprises six steps: raw material mixing, granulation, low-temperature smelting, high-temperature smelting, three-time crude tin discharging for three times and one-time slag discharging. Industrial production of the high-silicon tin ore in the top blowing furnace is realized through material mixing, process selection, process condition control and the like; the silicon content of the tin smelting oreis increased to 1%-10%, the direct recovery rate of tin reaches 77% or above, the furnace hearth index reaches 30 t / (dm<2>) or above, and the technology bottleneck of difficulty in industrializationof the high-silicon tin ore is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of high-silicon tin ore smelting, and in particular relates to a method for treating high-silicon tin ore with an oxygen-enriched top-blown furnace. Background technique [0002] Tin smelting has a long history, especially after the modern industrial revolution, the scale of tin smelting has gradually developed from decentralized to intensive, from workshop to group. Low-efficiency and high-pollution smelting equipment such as multi-hearth furnace roasting and acid leaching have also been gradually eliminated; currently, electric furnaces, top-blowing furnaces and other equipment are mostly used for tin smelting. [0003] With the continuous mining of tin ore resources, the dilution of tin ore is becoming more and more serious, and the composition is becoming more and more complex. Tin smelting technology is also facing new challenges. The silicon content in tin ore has a great influence on the smelting tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B25/02C22B1/24
CPCC22B25/02C22B1/24
Inventor 王红彬王彦坤吴红星樊家剑刘庆东张驰李志禄
Owner YUNNAN TIN
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