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Environmental protection method for extracting lead in waste storage battery

A technology for waste batteries and batteries, which is applied in the field of lead extraction, can solve the problems of large equipment investment, high smelting temperature, environmental pollution, etc., and achieve the effect of high value and high purity

Inactive Publication Date: 2005-09-07
环境保护危险废物处置工程技术(沈阳)中心有限公司
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Problems solved by technology

At present, domestic methods of recovering lead from waste batteries are mostly carried out by reverberatory furnace mixing method. The smelting temperature is high, about 1200°C. The lead dust, lead vapor, lead slag and sulfur dioxide produced by the high temperature have caused serious environmental problems. pollution, and the method also has the problem of low recovery rate of lead, which generally can only reach about 80%
[0003] At present abroad, the smelting method of first desulfurization and then fire reduction is used to recover lead, but this method requires a large investment in equipment, which requires a variety of equipment such as blowers, reverberatory furnaces, electric furnaces and converters, and will still cause environmental damage during the work process. Pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment one: see figure 1

[0021] Such as figure 1 As shown, this embodiment includes three parts: pretreatment desulfurization, electrolytic deposition and desulfurization agent recovery.

[0022] 1. Pretreatment desulfurization

[0023] 1.1 After the battery is poured acid, the cutting machine cuts off the upper cover and pours out the pole plate. The pole plate is sent to the rod mill after acid washing, and the grid plate and filler are obtained by screening after the rod mill;

[0024] 1.2 The grid plate is directly melted and cast into a finished alloy ingot. After the filler is finely ground into a ball mill to a size larger than 80 mesh, it enters a desulfurization reactor for desulfurization, and a desulfurizer and a reducing agent are added for desulfurization and reduction transformation. The desulfurizer is sodium carbonate and the reducing agent is sodium nitrite, the reaction formula is

[0025]

[0026]

[0027] 1.3 After the filler ...

Embodiment 2

[0038] Embodiment two: see figure 2

[0039] The difference from Example 1 is that in the pretreatment desulfurization stage, sodium sulfite is used as the reducing agent, and the reaction formula is:

[0040]

[0041]

[0042] Others are the same as the embodiment.

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Abstract

The present invention provides an environmental protection lead extraction method from waste and old accumulator, which overcomes problem existed in home and abroad technology. Most domestic technologies adopt flame furnace blended smelting method, in which lead dust, steam and skim and sulfur dioxide and so on, generated by high temperature, contaminate environment seriously and recovery ratio of lead is low. Abroad technologies mostly adopt method of smelting in which desulfurization goes first and pyrogenic process reduction second. This method needs high equipment investment, but still pollutes environment. The invention mainly comprises preconditioning of desulfuration, in which desulfurizer is soda and reducer is erinitrit or sodium sulfite; electrodeposition and reclamation of desulfurizer. Advantages in this invention: the whole craft proceeds in wet environment and normal temperature, so that it doesn't generate lead dust, steam and skim and sulfur dioxide to pollute the environment; water can be used with recirculation and purification of lead by electrolyzation is high.

Description

technical field [0001] The invention relates to a method for extracting lead from waste accumulators. Background technique [0002] Recycling lead in waste batteries has always been a headache. At present, domestic methods of recovering lead from waste batteries are mostly carried out by reverberatory furnace mixing method. The smelting temperature is high, about 1200°C. The lead dust, lead vapor, lead slag and sulfur dioxide produced by the high temperature have caused serious environmental problems. pollution, and the method also has the low recovery rate of lead, which generally only reaches about 80%. [0003] At present abroad, the smelting method of first desulfurization and then fire reduction is used to recover lead, but this method requires a large investment in equipment, which requires a variety of equipment such as blowers, reverberatory furnaces, electric furnaces and converters, and will still cause environmental damage during the work process. pollute. Con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B13/00C25C1/18
CPCY02P10/20
Inventor 李东红张正洁金重阳陈曦许增贵
Owner 环境保护危险废物处置工程技术(沈阳)中心有限公司
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