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A continuous low-temperature smelting method for secondary lead

A technology of secondary lead and low temperature, which is applied in the continuous low-temperature smelting of secondary lead and the smelting field of secondary lead, which can solve the problems of increased difficulty, sulfur dioxide pollution, fluctuating sulfur dioxide concentration in flue gas, etc., to reduce smelting energy consumption and low smelting smoke rate , Solve the effect of large fluctuations in sulfur dioxide concentration

Active Publication Date: 2022-06-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] More than 85% of my country's recycled lead raw materials come from waste lead-acid batteries. The lead in waste lead-acid batteries is mainly distributed in grids and lead paste, while the lead in lead paste is oxide and sulfate, and the composition is complex, resulting in lead regeneration methods. difficulty
[0005] The sulfur content in lead paste is low, and the pollution control of low-concentration sulfur dioxide in the smelting process has always been a problem that plagues the industry. The pre-desulfurization method prevailing abroad is high in cost and small in scale, and does not have the conditions for large-scale market promotion in my country; oxygen-enriched side blowing Furnace smelting lead paste technology solves the problem of large-scale processing of lead paste, and the concentration of sulfur dioxide in the smelting flue gas is high, which has the possibility of acid production. Due to the high smelting temperature, the smelting smoke rate is as high as 25%, and a large amount of Material circulation smelting leads to high production costs, and the traditional single-side blowing furnace treatment method fluctuates greatly in the concentration of sulfur dioxide in the flue gas, which also increases the difficulty of acid production. The big problem is the key to the clean production of secondary lead in my country

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  • A continuous low-temperature smelting method for secondary lead
  • A continuous low-temperature smelting method for secondary lead

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this example, the lead paste of a certain factory in Anhui was taken as the research object, and 300kg of lead paste (Pb 75.89%, S 6.16%, Si0.62%) was mixed with coal (58.5kg), stones (6kg), iron filings (6kg) , Sodium carbonate (7.5kg) is continuously added to the side-blowing oxidation furnace, and after the addition of the material, it is kept at 1130-1150°C for 3 hours, and the high-lead slag directly flows into the reduction furnace and is kept at 1130-1150°C for 3 hours. Crude lead in the oxidation furnace was 98.33kg (containing 98.78% lead), crude lead in the reduction furnace was 126.51kg (containing 99.12% lead), the total recovery rate of lead was 97.74%, and the smoke and dust rate was 13.88%. Furnace flue gas sulfur dioxide concentration was stable at 0.32%.

Embodiment 2

[0042] The present invention takes the lead paste of a factory in Anhui as the research object, mixes 300kg of lead paste (Pb 75.89%, S 6.16%, Si0.62%) with coal (58.5kg), stones (5kg), iron filings (5kg), Sodium carbonate (9kg) is continuously added into the side-blowing oxidation furnace. After the addition of the material, it is kept at 1120-1140°C for 2.5 hours. The high-lead slag flows directly into the reduction furnace, and it is kept at 1120-1140°C for 2.5 hours. Finally, it is Crude lead in the oxidation furnace was 96.33kg (99.18% lead), crude lead in the reduction furnace was 127.40kg (99.32% lead), the total recovery rate of lead was 97.54%, and the dust rate was 12.16%. The sulfur dioxide concentration in the flue gas of the oxidation furnace was stable at 2.57%. The concentration of sulfur dioxide in furnace flue gas was stable at 0.31%.

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Abstract

The invention discloses a continuous low-temperature smelting method for secondary lead. The method is to mix lead-containing materials, coal, iron-containing materials, calcium-containing materials and sodium salts, and then continuously add them into the oxygen-enriched side-blowing oxidation furnace, and carry out insulation melting at a temperature of 1100-1200 ° C, and continuously recover crude oil during the melting process. Lead: The high-lead slag generated during the smelting process of the oxygen-enriched side-blown oxidation furnace flows intermittently into the oxygen-enriched side-blown reduction furnace, and is kept for melting at a temperature of 1100-1200 ° C. Crude lead is continuously recovered during the smelting process. By constructing a quaternary iron-silicon-calcium-sodium smelting slag system with low melting point, the method can greatly reduce the temperature of secondary lead smelting, reduce the energy consumption of smelting, and use oxygen-enriched side-blowing double furnaces for continuous smelting, which solves the traditional problem The method solves the problem that the concentration of sulfur dioxide fluctuates greatly and is difficult to control.

Description

technical field [0001] The invention relates to a method for smelting secondary lead, in particular to a continuous low-temperature smelting method for secondary lead, which belongs to the technical field of nonferrous metal smelting. [0002] technical background [0003] With the continuous development of the lead industry, the consumption of lead raw materials is increasing, and its recoverable resources are becoming less and less. The recycling and reuse of lead has naturally become the focus of the lead industry. At present, the output of secondary lead in industrially developed countries and medium-developing countries has exceeded the output of primary lead: for example, the output of secondary lead in the United States has accounted for more than 70% of the total lead output, Europe has reached 80%, and some countries with shortage of lead resources have reached more than 90%. It reached 50%, while my country's secondary lead production accounted for less than 43%, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B13/02C22B7/00
CPCC22B13/025C22B7/001Y02P10/20
Inventor 刘维焦芬覃文庆李文华韩俊伟张添富杨聪仁
Owner CENT SOUTH UNIV