Method for preparing high-quality lead citrate by waste lead paste wet method

A technology of lead citrate and waste lead paste, applied in the directions of carboxylate preparation, carboxylate preparation, chemical instruments and methods, etc., can solve the problems of inability to directly recycle, low metal recovery rate, and high SO2 concentration, and achieve resource The effect of good recovery effect, high quality and high desulfurization efficiency

Inactive Publication Date: 2017-07-07
HENAN UNIV OF URBAN CONSTR
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  • Application Information

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Problems solved by technology

The problems of the direct fire lead smelting recovery process are high smelting temperature, high energy consumption in the process; serious lead dust pollution; high concentration of SO2 produced in the smelting process, serious pollution, and low metal recovery rate
In particular, lead paste is a mixture. The process of preparing l...

Method used

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  • Method for preparing high-quality lead citrate by waste lead paste wet method
  • Method for preparing high-quality lead citrate by waste lead paste wet method

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Embodiment 1

[0024]Embodiment 1: The method for preparing high-quality lead citrate by waste lead paste wet method, comprising the following steps: (a) obtain lead paste from the positive plate and negative plate of waste lead storage battery, the main components are lead sulfate and lead dioxide , lead oxide, lead and some impurities; (b) the lead plaster is first mixed with a solution containing sodium citrate, lead oxide and lead sulfate in the lead plaster are dissolved in the sodium citrate solution, and there is no reaction or the remaining substances are simple lead, di Lead oxide and impurities, the mass concentration of sodium citrate in sodium citrate solution is 5%, the desulfurization reaction temperature is 10°C, and the desulfurization reaction time is 0.5h. After sufficient desulfurization reaction, the desulfurization rate of the lead paste is ≥99%. Liquid separation, separation to obtain solid matter mainly lead dioxide and metal lead, used to purify lead dioxide or prepare...

Embodiment 2

[0025] Embodiment 2: The method for preparing high-quality lead citrate by waste lead paste wet method, comprising the following steps: including the following steps: (a) obtaining lead paste from the positive and negative plates of waste lead storage batteries, the main component of which is lead sulfate , lead dioxide, lead oxide, lead and some impurities; (b) the lead plaster is first mixed with a solution containing sodium citrate, and the lead oxide and lead sulfate in the lead plaster are dissolved in the sodium citrate solution, and there is no reaction or the remaining substances are Elemental lead, lead dioxide and impurities, the mass concentration of sodium citrate in sodium citrate solution is 15%, the desulfurization reaction temperature is 25°C, and the desulfurization reaction time is 1h. After sufficient desulfurization reaction, the desulfurization rate of the lead paste is ≥99% %, solid-liquid separation, separation to obtain solid matter mainly lead dioxide a...

Embodiment 3

[0026] Embodiment 3: The method for preparing high-quality lead citrate by waste lead plaster wet method, comprising the following steps: including the following steps: (a) obtaining lead plaster from the positive and negative plates of waste lead storage batteries, the main component of which is lead sulfate , lead dioxide, lead oxide, lead and some impurities; (b) the lead plaster is first mixed with a solution containing sodium citrate, and the lead oxide and lead sulfate in the lead plaster are dissolved in the sodium citrate solution, and there is no reaction or the remaining substances are Elemental lead, lead dioxide and impurities, the mass concentration of sodium citrate in sodium citrate solution is 30%, the desulfurization reaction temperature is 55°C, and the desulfurization reaction time is 2.5h. After sufficient desulfurization reaction, the desulfurization rate of the lead paste is ≥ 99%, solid-liquid separation, separation to obtain solid matter mainly lead diox...

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Abstract

The invention discloses a method for preparing high-quality lead citrate by a waste lead paste wet method. The method comprises the following steps: lead paste is obtained from a positive plate and a negative plate of a waste lead accumulator; the lead paste is firstly mixed with solution containing sodium citrate to fully desulfurize for solid-liquid separation to obtain filtrate; citric acid is added in the filtrate to adjust pH of the filtrate; the filtrate is reacted with the citric acid for solid-liquid filtration and separation to obtain lead citrate; and the lead citrate is washed and dried to obtain high-quality lead citrate powder. The method prepare the lead citrate and lead tetraoxide by lead paste desulfurized products of waste lead, recovers sodium sulfate in desulfurizing solution, is low in energy consumption and simple in equipment, recovers lead resources in a classified manner, is high in quality of the lead citrate, and has the characteristics of good resource recovery effect and green and environment-friendly production process.

Description

technical field [0001] The invention belongs to the technical field of regenerated lead production, and relates to the recycling of waste lead-acid batteries, in particular, the waste lead paste is desulfurized and leached by a wet method, and the high-quality lead citrate powder is recovered and prepared as a precursor for preparing lead oxide. Background technique [0002] Lead-acid batteries occupy the first place in the secondary battery market due to their excellent cost performance, stable electrochemical performance, mature production technology and high recycling of waste products. Lead-acid batteries consume more than 82% of the world's total lead consumption. With the continuous scrapping of lead-acid batteries, the amount of waste batteries is increasing. Waste lead-acid batteries are usually composed of 4 parts: waste electrolyte 11%-30%, lead or lead alloy grid 24%-30%, lead paste 30%-40%, organic matter 22%-30%. [0003] The process and technology of recoveri...

Claims

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Application Information

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IPC IPC(8): C22B13/00C22B7/00C07C51/41C07C59/265C01D5/08
CPCC01D5/08C07C51/412C22B7/006C22B13/045C07C59/265Y02P10/20
Inventor 朱新锋杨家宽张伟殷世强汪潇郭一飞吴俊峰刘彪
Owner HENAN UNIV OF URBAN CONSTR
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