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Crude tin smelting system and process

A crude tin and process technology, which is applied in the crude tin smelting system and process field, can solve the problems of unfavorable smelting efficiency and environmental protection, large material dispersion and turnover, complex and lengthy process, etc., and achieve reduction of fugitive emissions and dust, small investment and high process efficiency. short process effect

Active Publication Date: 2020-09-15
YUNNAN TIN CO LTD TIN BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Therefore, the current main process of crude tin smelting is: pre-smelting treatment of tin concentrate (fluidized roaster, etc.) - reduction smelting (Ausmelt furnace, reverberatory furnace, etc.) - dilution treatment of tin-rich slag (Smoke Furnace)--Roasting treatment of refining slag (rotary kiln), each of the above-mentioned processes needs to be equipped with a complete processing system, resulting in large equipment investment, complicated and lengthy process, and many scattered turnover of materials, which is not conducive to Improve smelting efficiency and environmental protection

Method used

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  • Crude tin smelting system and process

Examples

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Effect test

Embodiment 1

[0036] 1) Continuously add tin concentrate, tin-containing raw materials and flux into the top-blown furnace 1 for smelting, reduction and slag fuming; the air in the smelting stage is oxygen-enriched air containing 30-35% oxygen; In the stage, according to the sulfur content (1.5%) of the concentrate, secondary air is blown into the upper part of the furnace of the top-blowing furnace to completely burn the volatile matter; when the tin content in the slag is reduced to 3.5%, all the crude tin in the top-blowing furnace 1 is discharged To the condensate pot 2, the slag is not discharged;

[0037] 2) Continue to add 6-8cm agglomerates or bricks of the same volume to the top-blowing furnace 1 (to reduce the sulfur loss during the process of falling from the top-blowing furnace to the molten pool) for slag fuming, when the slag contains When the tin content is 0.16%, the fuming is finished, and the tin-poor slag is discharged from the slag outlet of the top blowing furnace 1 to ...

Embodiment 2

[0043] 1) Continuously add tin concentrate, tin-containing raw materials and flux into the top-blown furnace 1 for smelting, reduction and slag fuming; the air in the smelting stage is oxygen-enriched air containing 39-42% oxygen; In the first stage, according to the sulfur content (3%) in the concentrate, secondary air is blown into the upper part of the furnace of the top-blowing furnace to completely burn the volatile matter; when the tin content in the slag is reduced to 3%, all the crude tin in the top-blowing furnace 1 is discharged To the condensate pot 2, the slag is not discharged;

[0044] 2) Continue to add 7-9cm agglomerates or bricks of the same volume to the top-blowing furnace 1 (to reduce the sulfur loss during the process of falling from the top-blowing furnace to the molten pool) for slag fuming, when the slag contains When the tin content is 0.15%, the fuming is finished, and the tin-poor slag is discharged from the slag outlet of the top blowing furnace 1 t...

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Abstract

The invention discloses a crude tin smelting system and process. The system comprises a top blowing furnace, a condensate pot, a water quenching system, a waste heat boiler, a roasting furnace, a cooling flue, electric dust collectors, quenchers, cloth bag dust collectors and a desulfuration acid making system. Dust-containing smoke generated by the top blowing furnace enters the waste heat boilerthrough a smoke outlet in the top of the top blowing furnace. The condensate pot is arranged below the top blowing furnace. A smoke outlet I formed in the top of the roasting furnace communicates with the cooling flue. The water quenching system is connected with a slag outlet of the top blowing furnace. The electric dust collectors, the quenchers and the cloth bag dust collectors are sequentially connected. The two sets of electric dust collectors, quenchers and cloth bag dust collectors are arranged, one set of electric dust collector is connected with the waste heat boiler, and the other set of electric dust collector is connected to the cooling flue. The cloth bag dust collectors are connected to the desulfuration acid making system. According to the crude tin smelting system and process, the crude tin smelting system and process is less in equipment configuration and low in investment, the smelting, reduction and fuming processes are continuously completed in the same furnace, the turnover of the intermediate materials is reduced, and material losses are reduced.

Description

technical field [0001] The invention belongs to the technical field of tin smelting, and in particular relates to a crude tin smelting system and process. Background technique [0002] In the traditional process, the main purpose of pre-smelting roasting treatment of tin concentrate is to remove sulfur and arsenic in tin concentrate, so as to reduce the amount of smoke and dust and the rate of ethyl tin during smelting reduction (ethyl tin is mainly formed by tin, iron, and arsenic. compound of). The main form of sulfur and arsenic in tin concentrate is: pyrite (FeS 2 ), arsenopyrite (FeAsS), arsenopyrhotite (FeAsS 2 ), Arsenite (FeAs 2 ), etc., dissociation and oxidation reactions occur at the calcination temperature (850-950°C), and sulfur and arsenic generate SO 2 and As 2 o 3 It enters the flue gas and removes it. The main equipment is a fluidized roaster, a rotary kiln, etc. The tin concentrate that has been roasted before smelting is then subjected to reduction ...

Claims

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Application Information

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IPC IPC(8): C22B25/08C22B25/02
CPCC22B25/08C22B25/02Y02P10/20
Inventor 李正永杨从兴宋兴诚王彦坤刘庆东周先辉杨德香
Owner YUNNAN TIN CO LTD TIN BRANCH
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