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Lead recycling

A lead battery and lead citrate technology, applied in the field of lead recovery, can solve problems such as unpredictability, impact of lead waste, and difficulty in controlling the exact composition of products

Active Publication Date: 2009-11-04
CAMBRIDGE ENTERPRISE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The exact composition of the product is difficult to control and predict, and is influenced by the composition of the lead waste used

Method used

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Experimental program
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Embodiment

[0097] Synthesis of lead citrate

[0098] The reaction conditions suitable for the synthesis and recovery of lead citrate were studied. Preliminary experiments were performed using lead compounds available from commercial suppliers as models for spent battery pastes.

[0099] Analytical pure commercially available lead oxide (PbO, Acros Organics), lead dioxide (PbO 2 , Fisher Scientific), lead sulfate (PbSO 4 , Fisher Scientific), citric acid monohydrate (C 6 h 8 o 7 .H 2 O, Acros Organics) and, when appropriate, 27.5% hydrogen peroxide (H 2 o 2 ) aqueous solution (Aldrich) and trisodium citrate (Na 3 C 6 h 5 o 7 .2H 2 O, Fisher Scientific) was used as starting material.

[0100] The reaction was carried out in a beaker placed on a magnetic stirrer hot plate and equipped with a magnetic stirrer bar. In each experiment, the total volume of the aqueous citric acid solution was 30 mL. The reaction mixture was stirred at a constant rate of 250 rpm unless otherwise...

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Abstract

The present invention describes a method of recycling lead from lead containing waste, the method comprising the steps of mixing the battery paste with aqueous citric acid solution so as to generate lead citrate; isolating lead citrate from the aqueous solution; and converting the lead citrate to lead and / or lead oxide.

Description

field of invention [0001] The present invention relates to the recovery of lead from lead-containing waste. In particular, but not exclusively, the present invention relates to a method of recovering lead from battery waste, and the end product of the method. Background of the invention [0002] More than 50% of the world's lead production is from recycled lead. It is believed that close to 90% of the lead in lead batteries is recycled. Lead battery recycling involves processing lead battery paste to separate lead from other battery components. This involves physical separation techniques as well as chemical techniques such as hydrometallurgy, electrowinning and smelting (pyrometallurgy). [0003] In the most common method, battery paste is charged into a conventional smelting blast furnace and decomposed at elevated temperatures to obtain metallic lead. The paste substance contains a lot of PbSO 4 form of sulfur. Decomposition of this compound requires the use of rela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B13/00C22B7/00
CPCY02E60/12H01M6/52C22B7/007H01M4/56H01M10/06C22B13/045H01M10/54C22B3/165Y02E60/10Y02W30/84Y02P10/20
Inventor 拉马钱德兰·瓦桑特·库马尔维加·彼得罗娃·科策娃谢雷夫·索南姆兹
Owner CAMBRIDGE ENTERPRISE LTD
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