Less-slag and energy-saving method for smelting secondary lead through side-blown molten pool smelting furnace

A molten pool smelting furnace and recycled lead smelting technology, applied in the direction of improving process efficiency, can solve problems such as unsuitable lead paste, flue ash smelting, etc., to shorten the smelting cycle, improve economic benefits, and reduce the amount of smelting slag. Effect

Active Publication Date: 2020-01-17
湖北金洋冶金股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional blast furnaces, reverberatory furnaces and other smelting equipment have been proved to be unsuitable for the smelting of lead paste and flue ash during the actual verification process

Method used

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  • Less-slag and energy-saving method for smelting secondary lead through side-blown molten pool smelting furnace
  • Less-slag and energy-saving method for smelting secondary lead through side-blown molten pool smelting furnace
  • Less-slag and energy-saving method for smelting secondary lead through side-blown molten pool smelting furnace

Examples

Experimental program
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Effect test

Embodiment 1

[0023] combined with figure 1 The production process shown is a secondary lead smelting method with less slag and energy saving in side-blown molten pool melting furnace. This method divides the smelting process into slag oxidation period, slagging period, weak reduction period, strong reduction period, and slag discharge period There are five phases in total, and the control of each phase needs to regulate the gas, materials, atmosphere and other key points of the furnace body to achieve the purpose of harmless slag and maximum lead extraction. The alkalinity of slag is 1~1.25 、Density≤3.5g / cm 3 , slag containing lead ≤ 2%, and finally enter the slag discharge period.

[0024] 1. Slag oxidation period

[0025] During smelting, natural gas and oxygen-enriched air are blown into the side-blown furnace from the side, and the pressure of the natural gas in the spray gun is 0.2Mpa, and the pressure of oxygen-enriched air is 0.3Mpa. Control the flow of natural gas at 400~420m du...

Embodiment 2

[0037] combined with figure 1 The production process shown is a secondary lead smelting method with less slag and energy saving in side-blown molten pool melting furnace. This method divides the smelting process into slag oxidation period, slagging period, weak reduction period, strong reduction period, and slag discharge period There are five phases in total, and the control of each phase needs to regulate the gas, materials, atmosphere and other key points of the furnace body to achieve the purpose of harmless slag and maximum lead extraction. The alkalinity of slag is 1~1.25 、Density≤3.5g / cm 3 , slag containing lead ≤ 2%, and finally enter the slag discharge period.

[0038] 1. Slag oxidation period

[0039] During smelting, natural gas and oxygen-enriched air are blown into the side-blowing furnace from the side, the pressure of natural gas in the spray gun is 0.2Mpa, and the pressure of oxygen-enriched air is 0.3Mpa. Control the flow rate of natural gas at 420~440m dur...

Embodiment 3

[0051] combined with figure 1 The production process shown is a secondary lead smelting method with less slag and energy saving in side-blown molten pool melting furnace. This method divides the smelting process into slag oxidation period, slagging period, weak reduction period, strong reduction period, and slag discharge period There are five phases in total, and the control of each phase needs to regulate the gas, materials, atmosphere and other key points of the furnace body to achieve the purpose of harmless slag and maximum lead extraction. The alkalinity of slag is 1~1.25 、Density≤3.5g / cm 3 , slag containing lead ≤ 2%, and finally enter the slag discharge period.

[0052] 1. Slag oxidation period

[0053] During smelting, natural gas and oxygen-enriched air are blown into the side-blowing furnace from the side, the pressure of natural gas in the spray gun is 0.2Mpa, and the pressure of oxygen-enriched air is 0.3Mpa. Control the flow rate of natural gas at 420~440m dur...

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Abstract

The invention discloses a less-slag and energy-saving method for smelting secondary lead through a side-blown molten pool smelting furnace. The smelting process is divided into five stage periods: a slag oxidation period, a slag generation period, a weak reduction period, a strong reduction period and a slag discharge period, each stage needs to regulate gas, materials, atmosphere and other key points of a furnace body to achieve the purpose of harmless slag and maximum lead extraction, the basicity of the discharged slag is 1-1.25, the density is less than or equal to 3.5 g/cm<3>, and the lead content is less than or equal to 2%. Through the accurate control of slag parameters of the side-blown furnace, the purpose of lowering energy consumption and auxiliary material consumption is achieved. According to the less-slag and energy-saving method for smelting secondary lead through the side-blown molten pool smelting furnace, the direct yield of the secondary lead and the effective utilization rate of heat supply energy are greatly increased, the production efficiency of a smelting production line is facilitated to be greatly improved, and compared with kiln smelting lead paste and flue ash, the smelting cost of per ton of lead is lowered by 40%; and the lead content of the slag generated in the furnace is stably less than 2%, frequent slagging in the smelting process is avoided,the smelting period is shortened, the smelting energy consumption is lowered, and economic benefits are improved.

Description

technical field [0001] The invention relates to the technical field of secondary lead smelting in a side-blown molten pool melting furnace, and is particularly suitable for a smelting method with less slag and energy saving in a side-blown molten pool melting furnace. Background technique [0002] With the rapid development of electric vehicles, automobiles, and energy storage industries, especially the rapid growth of domestic electric vehicle usage in recent years, the demand for lead-acid batteries continues to increase. However, the service life of lead-acid batteries is affected by limiting factors such as plate corrosion and electrode polarization. After 2 to 3 years of use, the new batteries will enter the scrapping period. At present, large-scale lead-acid battery recycling plants mostly use advanced crushing and sorting equipment to crush and sort waste lead-acid batteries to obtain waste acid, plastics, lead scrap, lead paste and other substances. Among these subs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B13/02C22B7/00
CPCC22B13/025C22B7/001Y02P10/20
Inventor 陈建龙舒绍明张行祥李军王进
Owner 湖北金洋冶金股份有限公司
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