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Method for recovering lead oxide from waste containing lead oxide

A technology containing lead oxide and lead oxide, applied in the field of lead oxide recovery, can solve the problems of large consumption of chemical raw materials, low purity, high recycling cost, etc., and achieve the effect of eliminating secondary pollution and shortening the process flow

Active Publication Date: 2015-07-22
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the problem of high recovery cost, low yield and low purity caused by the need to consume a large amount of chemical raw materials and the long recovery process when the existing method is used to carry out wet recovery of PbO from waste materials containing lead oxide. However, it provides a new method for recovering high-purity PbO with simple process and high efficiency from waste containing lead oxide.

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  • Method for recovering lead oxide from waste containing lead oxide
  • Method for recovering lead oxide from waste containing lead oxide

Examples

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Embodiment approach

[0040] According to a preferred embodiment of the present invention, the precipitating agent is selected from one or more of carbon dioxide, sulfur dioxide and sulfur trioxide, and the method for reclaiming lead oxide from waste containing lead oxide preferably also includes the step of ( 3) The gas obtained by the desalination and decomposition of the lead salt precipitation is recycled as the precipitant in step (2), which can meet the requirements of atomic economy reaction, thereby achieving zero consumption and zero emission, and has more industrial application prospects.

[0041] According to another preferred embodiment of the present invention, the precipitating agent is selected from one or more of ammonium sulfate, ammonium oxalate and ammonium carbonate, and the method for reclaiming lead oxide from waste containing lead oxide preferably also includes The ammonia solution formed by the ammonia gas generated by the reaction in step (2) is used in the desalination and ...

Embodiment 1

[0069] This embodiment is used to illustrate the method for reclaiming lead oxide from waste containing lead oxide provided by the present invention.

[0070] The lead oxide waste (930g) used in this example is lead-containing flue ash from Huitong Smelter. After analysis, it mainly contains PbO with a weight percentage of 69%, and the rest is a small amount of SnO 2 , CaSiO 3 、Al 2 o 3 and SiO 2and other insoluble impurities, the equivalent amount of PbO is 2.9mol.

[0071] The recovery process of lead oxide is as follows:

[0072] (1) Add the above lead oxide-containing waste to 10 liters of ethylenediaminediacetic acid aqueous solution with a temperature of 45°C and a concentration of 0.5mol / L, stir and react for 20 minutes, and then filter the reaction product to obtain lead-containing filtrate and filter residue.

[0073] (2) Heat the above-mentioned lead-containing filtrate to 70°C and feed 3.0mol sulfur dioxide, then keep the reaction temperature of 65°C for 12 min...

Embodiment 2

[0076] This embodiment is used to illustrate the method for reclaiming lead oxide from waste containing lead oxide provided by the present invention.

[0077] The lead oxide waste material used in this embodiment is lead-containing flue ash derived from gold and lead smelters. After analysis, it mainly contains 63% PbO and 8% PbSO by weight. 4 , the rest is a small amount of Al 2 o 3 and SiO 2 and other insoluble impurities.

[0078] Pretreatment process (pre-desalination treatment), as follows:

[0079] Since the main components of the lead oxide-containing waste are PbO and PbSO 4 , only the waste containing lead oxide needs to be pre-desalted. Take 1.6 kg of the above lead oxide-containing waste (equivalent to 4.942 mol of PbO) and put it into 0.5 liter of NaOH with a concentration of 2 mol / L for desalination reaction, control the reaction temperature at 60°C, stir and react for 10 minutes and then filter to obtain the pretreated lead-containing material .

[0080] T...

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Abstract

The present invention provides a method for recovering lead oxide from waste containing lead oxide. The method comprises: (1) contacting waste containing lead oxide and a complexing agent solution, and carrying out solid-liquid separation on the contacting mixture to obtain the lead-containing filtrate and the filter residue; (2) carrying out a reaction of the lead-containing filtrate and a precipitating agent, carrying out solid-liquid separation on the obtained reaction product to obtain a lead salt precipitate and a regenerated complexing agent filtrate, and returning the complexing agent filtrate to the dissolving process of the step (1); and (3) carrying out desalination decomposition on the lead salt precipitate to obtain PbO. With the method of the present invention, the PbO in the waste containing lead oxide can be efficiently and selectively recovered, the impurities can be effectively removed, and the high-purity PbO can be obtained.

Description

technical field [0001] The invention relates to a method for recovering lead oxide from waste materials containing lead oxide. Background technique [0002] Since the invention of lead-acid battery by French engineer Plante in 1859, lead-acid battery has occupied an important position in the secondary battery market, especially the car battery and electric bicycle market, because of its low price and reliable stability. According to battery statistics, the total consumption of refined lead in China in 2012 exceeded 4.646 million tons, of which the consumption of lead-acid batteries was 3.3 million tons, accounting for about 71% of the total lead consumption. Due to the rapid development of my country's automobile consumption, it can be predicted that for a long period of time in the future, it will still face the problems of continuous growth of lead consumption and increasingly scarce lead resources. At present, the main method of large-scale lead production is pyrometallu...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B13/00
CPCY02P10/20Y02P20/129
Inventor 潘军青张超孙艳芝
Owner BEIJING UNIV OF CHEM TECH
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