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Method for extracting metallic lead from alkaline leaching solution of waste lead-containing glass

A technology for extracting metal and leaching solution, applied in the field of extracting metal lead and producing metal lead, can solve the problems of difficult direct leaching of alkaline solution, high consumption of cleaning water, difficult cleaning, etc. effect of speed

Inactive Publication Date: 2015-05-06
SHANGHAI SECOND POLYTECHNIC UNIVERSITY +1
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  • Abstract
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Problems solved by technology

However, the element lead in leaded glass is wrapped in the silica network structure of the glass, which is relatively stable, and it is difficult to be leached directly by alkaline solution.
Chinese patent CN104120444A discloses a method for recovering metallic lead in waste lead-containing glass, that is, reducing and activating the lead-containing glass in a planetary ball mill by adding a reducing agent, and leaching the lead-containing glass powder after reduction and activation in a sodium hydroxide solution , the lead in the lead-containing glass can be leached and recovered, but the metallic lead electrodeposited by the traditional electrodeposition process in the alkaline lead-containing solution after leaching is spongy lead. Because the lead-containing glass leaching solution contains a small amount of dissolved silicon oxide, the solution is relatively Viscous, the alkaline solution is wrapped in the electrodeposited spongy metal lead, it is difficult to clean, the consumption of cleaning water is large, and the efficiency is low

Method used

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  • Method for extracting metallic lead from alkaline leaching solution of waste lead-containing glass

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Embodiment 1

[0020] The sodium hydroxide alkaline leaching solution of waste cathode ray tube (CRT) cone glass is used as raw material, and its lead concentration is 18.5g / L. Add 500ml of the above leaching solution into a beaker and heat to 70°C, add 2.8g of electrodeposited flake metal zinc powder and 2mg of fatty alcohol phosphate (Jiangsu Haian Petrochemical Factory) while stirring, and the stirring speed is 300 r / min , reacted for 90 min. After the replacement reaction is completed, filter, wash and dry the solid to obtain metallic lead products, and the direct recovery rate of lead is greater than 90%. Then add 0.3g metallic zinc powder to the liquid to remove the remaining lead impurities, and then electrodeposit to obtain flake metallic zinc powder. Electrodeposition After completion of filtration, the solution returns to leach the lead-containing glass, and the metal zinc powder returns to the replacement reaction.

Embodiment 2

[0022] The sodium hydroxide alkaline leaching solution of waste crystal glass is used as raw material, and its lead concentration is 16.7g / L. Add 500ml of the above leaching solution into a beaker and heat it to 80°C. While stirring, add 2.45g of flake metal zinc powder obtained by electrodeposition, 1mg of fatty alcohol ether phosphate (Jiangsu Haian Petrochemical Factory) and 1mg of dodecylsulfuric acid Sodium (Sinopharm Group Chemical Reagent Co., Ltd.), the stirring speed is 400 r / min, and the reaction is 60 min. After the replacement reaction is completed, filter, wash and dry the solid to obtain metallic lead products, and the direct recovery rate of lead is greater than 90%. Add 0.5g metallic zinc powder to the liquid to remove the remaining lead impurities, and then electrodeposit to obtain flake metallic zinc powder. Electrodeposition After completion of filtration, the solution returns to leach the lead-containing glass, and the metal zinc powder returns to the r...

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Abstract

The invention discloses a method for extracting metallic lead from alkaline leaching solution of waste lead-containing glass. The method disclosed by the invention comprises the following steps of: heating the alkaline leaching solution of lead-containing glass to 50-80 DEG C; then, adding flaked metal zinc powder generated by electro-deposition and a surface active agent while stirring to carry out displacement, wherein the mass ratio of lead to zinc powder in the leaching solution is (0.29-0.31):1; and the addition amount of the surface active agent is 1-10mg / L; and then, carrying out solid-liquid separation, adding the metal zinc powder into filtrate again so as to remove the impurity, namely lead; electrically depositing solution with lead removed, repetitively using the obtained flaked metal zinc powder in replacement reaction, and returning the solution to leach the lead-containing glass. According to the invention, the problem that sponge metallic lead obtained by direct electro-deposition is difficultly cleaned in the thick alkaline leaching solution of the lead-containing glass is solved; simultaneously, the zinc powder obtained after electro-deposition does not need to be cleaned and can be directly used for replacement reaction of the leaching solution of the lead-containing glass in a circulating manner; and thus, closed-loop circulation of the solution is realized.

Description

technical field [0001] The invention relates to a method for extracting metallic lead from the alkaline leaching solution of waste lead-containing glass, in particular to a method for producing metallic lead from the alkaline leaching solution of waste lead-containing glass, belonging to the technical field of hydrometallurgy and solid waste recycling . Background technique [0002] Among glass products, leaded glass has many special properties, such as good radiation protection, electrical conductivity, optical properties and processability, etc. These properties cannot be replaced by other glasses for a while, so the production of leaded glass is in the At this stage and even in a longer period of time in the future, there is still great value, and it is mainly used in the fields of cathode ray tube (CRT), electric light source products, electronic circuit sealing and crystal glass. [0003] With the rapid elimination and renewal of electronic products, a large amount of ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B13/00
CPCY02P10/20
Inventor 张承龙庄莉莉杨义晨苑文仪王景伟白建峰
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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