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Method for converting lead sulfate into lead tetraoxide

A technology of trilead tetroxide and lead sulfate, applied in lead oxide, lead dan and other directions, can solve the problems of high energy consumption, affect the health of operators, affect the environment, etc., and achieve the effect of low energy consumption, no need for high temperature, and simple method.

Active Publication Date: 2011-05-25
双登天鹏冶金江苏有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method generally requires high-temperature decomposition and reduction at 800-1500°C, which not only consumes high energy, but also causes a large amount of lead to volatilize at this high temperature, which affects the environment and the health of operators

Method used

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  • Method for converting lead sulfate into lead tetraoxide
  • Method for converting lead sulfate into lead tetraoxide
  • Method for converting lead sulfate into lead tetraoxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Weigh 3.03kg of lead sulfate and 1kg of sodium sulfide, add them to 10kg of deionized water, add a certain amount of ammonia water, adjust the pH to about 14, stir and react for 0.5h, and obtain 2.4kg of white (slightly yellow) solid precipitated lead sulfide, filter The precipitate was removed and washed.

[0012]

[0013] Add the above 2.4kg of lead sulfide to 8L of nitric acid solution with a concentration of 15% by mass, heat, keep the solution temperature at about 70°C, and continue stirring for 1 hour to completely dissolve the lead sulfide.

[0014]

[0015] The above solution was evaporated to dryness and heated in a sand bath (temperature 280°C) to obtain 2.6kg of white (slightly yellow) solid lead nitrate.

[0016] Add the above 2.6kg of lead nitrate into the stirring ball mill, continuously feed the nitrogen-oxygen mixed gas with an oxygen content of 35% (volume percentage), the ball mill speed is 80 rpm, and continue the ball milling for 2 hours. The ...

Embodiment 2

[0019] Weigh 3.03kg of lead sulfate, 0.5kg of sodium sulfide and 0.5kg of ammonium sulfide, add them to 10kg of deionized water, add a certain amount of ammonia water, adjust the pH to about 14, stir for 1 hour, and obtain a white (slightly yellow) solid precipitate of about 2.4kg, filter out the precipitate, and wash.

[0020] Add the above 2.4kg of lead sulfide to 5L of nitric acid solution with a concentration of 25% by mass, heat, keep the temperature of the solution at about 70°C, and continue stirring for 0.6h to completely dissolve the lead sulfide.

[0021] The above solution was evaporated to dryness and heated in a sand bath (temperature 250° C.) to obtain 2.6 kg of a white (slightly yellow) solid.

[0022] Add the above 2.6kg of solids into the stirring ball mill, continuously feed the nitrogen-oxygen mixed gas with an oxygen content of 55% (volume percentage), the speed of the ball mill is 120 rpm, and continue the ball milling for 0.6h. The final product is red le...

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Abstract

The invention discloses a method for converting lead sulfate in a waste lead-acid storage battery into lead tetraoxide, comprising the following steps of: firstly, reacting the lead sulfate, excessive soluble sulfide salt and a small amount of ammonia water, and converting the lead sulfate into lead sulfide; then filtering out the lead sulfide, adding the lead sulfide into hot dilute nitric acid, and fully reacting; then steaming solution, continuously heating to be certain temperature, after reactants are decomposed completely, putting residues into a stirring ball mill for grinding, simultaneously, introducing oxygen-nitrogen mixed gas with certain oxygen content, and obtaining a final product, namely the lead tetraoxide. The method is simple and practical, high temperature is not needed, the energy consumption is low, the pollution is less, the prepared lead tetraoxide can be used as an active substance which is reused in a lead-acid storage battery.

Description

technical field [0001] The invention relates to a method for making a lead-acid battery, in particular to a method for converting lead sulfate in waste lead-acid batteries into trilead tetroxide. Background technique [0002] Lead-acid battery is currently the most widely used secondary battery, and its characteristics are: cheap, reliable performance, and lead metal can still be recovered and smelted at the end of its life. Lead metal elements in lead-acid batteries mainly exist in the form of lead alloy, lead oxide, lead oxide and lead sulfate. During the daily use of lead-acid batteries, lead alloys, lead oxide and lead oxide A large percentage will be irreversibly converted into lead sulfate. Therefore, when the life of the lead-acid battery ends, about 20% of the lead element in it is converted into lead sulfate, and lead sulfate cannot be directly used for the remanufacturing of the lead-acid battery. [0003] At present, lead sulfate in waste lead-acid batteries is ...

Claims

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Application Information

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IPC IPC(8): C01G21/10
Inventor 王青李磊陈小山陈怀平
Owner 双登天鹏冶金江苏有限公司
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