Process for recovering metallic lead from waste lead-contained glass by adopting mechanical activation reduction method

A technology of mechanical activation and reduction method, applied in the field of metal lead recovery, can solve the problems of complicated solid-liquid separation operation, difficult direct leaching of alkali solution, loss of equipment caustic soda, etc. , the effect of high leaching rate

Active Publication Date: 2014-10-29
SHANGHAI SECOND POLYTECHNIC UNIVERSITY +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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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 CN100400683C discloses a method for recycling metallic lead in waste lead-containing glass, that is, adding a strong alkali solution in the process of planetary ball grinding, and leaching while activating, so that the lead in lead-containing glass can be leached, but the solution after leaching Because it is mixed with the activation medium, the solid-liquid separation operation is complicated, and the corrosion of the equipment and the loss of caustic soda are serious due to leaching while activation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Use waste cathode ray tube (CRT) cone glass as raw material, and its lead content is 24.5wt%. Crush 50g of the glass raw material to 1-2mm, add it to the ball mill tank of the planetary ball mill, then add 3.5g iron powder, and control the mass ratio of raw material and ball milling medium (stainless steel ball) to 1: 8, at 400 rpm Ball milled for 120 min under the speed of rotation; then the activated glass powder was taken out, added to 1.0 L of industrial caustic soda solution with a concentration of 3 mol / L, and leached for 90 min. The leaching rate of lead in glass is 94.8%. The leaching solution can be directly circulated in the next leaching process after the metal lead is extracted by conventional electrodeposition, and the leaching residue can be used to prepare foam glass.

Embodiment 2

[0022] The waste fluorescent lamp stem glass is used as raw material, and its lead content is 26.7wt%. Crush 100g of the glass raw material to 1-2mm, add it to the ball mill tank of the planetary ball mill, add 5g iron powder, and control the mass ratio of raw material and ball milling medium (zirconia ball) to 1: 10, at 450 rpm Ball milled for 120 min under the speed of rotation; then the activated glass powder was taken out, added to 2.0 L of industrial caustic soda solution with a concentration of 5 mol / L, and leached for 90 min. The leaching rate of lead in glass is 93.7%. After filtration, the leaching solution can be directly circulated in the next leaching process after the metal lead is extracted by conventional electrodeposition, and the leaching residue can be used to prepare foam glass.

Embodiment 3

[0024] Using waste crystal glass as raw material, its lead content is 21.9wt%. Crush 100g of the glass raw material to 1-2mm, add it to the ball mill tank of the planetary ball mill, add 2.2g of zinc powder, and control the mass ratio of raw material: activation medium (zirconia ball) to 1: 10, at 500 / min Ball milled for 120 min at the speed of rotation; then the activated glass powder was taken out, added to 2.0 L of industrial caustic soda solution with a concentration of 7 mol / L, and leached for 90 min. The leaching rate of lead in glass is 91.5%. After filtration, the leaching solution can be directly circulated in the next leaching process after the metal lead is extracted by conventional electrodeposition, and the leaching residue can be used to prepare foam glass.

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Abstract

The invention discloses a process for recovering metallic lead from waste lead-contained glass by adopting a mechanical activation reduction method. Firstly, the lead-contained glass is crushed into 1-2 mm; the glass, a ball milling medium and a reducing agent are prepared based on the mass ratio of 1: (5-20) of the glass to the ball milling medium and the mass ratio of (0.05-0.3): 1 of the reducing agent to the lead in a raw material; and the ball milling activation is performed for 30-180 minutes at a rotating speed of 300-500 r / min in a planet ball mill; the lead-contained glass powder after the reduction activation is leached through sodium hydroxide solution; after the lead in the lead-contained glass is dissolved, the solid-liquid separation is achieved through filtering; and then, the metallic lead is extracted from the leaching agent by a traditional electrodeposition method. The process realizes the smelting recovery of the metallic lead in the lead-contained glass under the normal pressure by a direct alkaline wet method, is simple in technological flow and low in cost, and achieves the harmless treatment requirement when performing the resource treatment on the waste lead-contained glass.

Description

technical field [0001] The invention relates to a process for recovering metallic lead from waste lead-containing glass, and belongs to the technical field of non-ferrous metal recovery 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 leaded glass has become waste and is directly piled up or mixed into domestic waste landfills. Leaded glass is hazardous waste. If it is not pro...

Claims

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Application Information

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IPC IPC(8): C25C1/18C22B7/00
CPCY02P10/20
Inventor 张承龙邓明强罗新云庄莉莉白建峰
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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