Method for extracting metallic lead from recovered waste lead-containing glass

A technology for extracting metal and glass, applied in the direction of improving process efficiency, can solve problems such as serious pollution, inability to remove lead, and lead pollution hazards.

Inactive Publication Date: 2012-04-18
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention discloses a method for extracting metallic lead from recycled waste lead-containing glass. On the one hand, it can effectively overcome the problem that lead-containing glass cannot be removed by traditional melting process, and lead pollution is caused by indiscriminate use; on the other hand, the hydrofluoric acid method is adopted. Recycling and processing of lead-containing glass, there are problems such as serious pollution

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  • Method for extracting metallic lead from recovered waste lead-containing glass
  • Method for extracting metallic lead from recovered waste lead-containing glass
  • Method for extracting metallic lead from recovered waste lead-containing glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The used cathode ray tube (CRT) cone glass is used as raw material, and its chemical composition is shown in Table 1.

[0014] Table 1 Chemical composition of waste cathode ray tube (CRT) funnel glass

[0015]

[0016] Extraction process such as figure 1 Shown: crush 50g of the above-mentioned glass raw material to 1-2mm, add it to the ball mill tank of the planetary ball mill, add 1.0L concentration of 3-7mol / L sodium hydroxide solution and 5g calcium-containing leaching reaction additive at the same time, the described The leaching reaction additive is commercially available industrial grade calcium oxide, wherein the mass ratio of raw material: ball milling medium is 1:8, and the ball milling medium is zirconia or stainless steel balls. Under the condition of planetary ball mill speed 150r / min, the reaction takes 120min. The leaching rate of lead in glass is 99.7%. Then filter, the leaching solution can be directly circulated in the next leaching process after t...

Embodiment 2

[0018] Using waste crystal glass as raw material, its chemical composition is shown in Table 2.

[0019] Table 2 Chemical composition of waste crystal glass

[0020]

[0021] Extraction process such as figure 1 Shown: crush 100g of the above-mentioned glass raw material to 1-2mm, add it to the ball mill tank of the planetary ball mill, add 1.8L of sodium hydroxide solution with a concentration of 3-7mol / L and 18g of calcium-containing leaching reaction additive at the same time, the The reaction additive is commercially available technical grade calcium hydroxide, and wherein raw material: the mass ratio of ball milling medium is 1: 10, and described ball milling medium is zirconia or stainless steel ball, and the planetary ball mill rotating speed is the stirring reaction under the condition of 250r / min 90min. The leaching rate of lead in glass is 99.9%. Then filter, the leaching solution can be directly circulated in the next leaching process after the metal lead is ex...

Embodiment 3

[0023] Using waste lead-containing glass as raw material, its chemical composition is shown in Table 3.

[0024] Table 3 Chemical composition of waste leaded glass

[0025]

[0026] Extraction process such as figure 1 Shown: crush 100g of the above-mentioned glass raw material to 1-2mm, add it to the ball mill tank of the planetary ball mill, add 0.8L of sodium hydroxide solution with a concentration of 3-7mol / L and 31g of calcium-containing leaching reaction additive at the same time, the The reaction additive is the mixture of commercially available technical grade calcium oxide and calcium hydroxide mixed in any proportion, wherein raw material: the mass ratio of ball milling medium is 1: 18, and described ball milling medium is zirconia or stainless steel ball, in planetary ball mill The reaction was stirred and reacted for 60 min at a rotation speed of 350 r / min. The leaching rate of lead in glass is 99.5%. Then filter, the leaching solution can be directly circulat...

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Abstract

The invention discloses a method for extracting metallic lead from waste lead-containing glass. The method comprises the following steps of: crushing the lead-containing glass as a raw material to be 1-2mm; weighing up the raw material, a ball milling medium and a leached reaction additive according to the mass ratio of the raw material to the ball milling medium being 1:(5-20) and the mass ratio of the leached reaction additive to silicon oxide contained in the raw material being (0.1-0.5):1; adding the raw material, the ball milling medium and the leached reaction additive to a ball milling jar of a planetary ball miller; adding 3-7 mol / L sodium hydroxide solution to the ball milling jar; under the condition that the rotating speed of the planetary ball miller is 100-350r / min, grinding and activating the glass and simultaneously leaching for 30-150min, wherein the leaching rate of lead in the lead-containing glass is 98-100 percent; and filtering leachate, extracting the metallic lead from the leachate and then returning to the leaching flow. The leached mud obtained by filtering is general industrial solid waste and can be used producing foam glass. The method is simple in process and low in cost. According to the method disclosed by the invention, the lead-containing glass can be dissolved in aqueous alkali, and thus the innocent and recycled treatment of the waste lead-containing glass is realized.

Description

technical field [0001] The invention relates to a method for extracting metallic lead from recycled waste lead-containing glass, and belongs to the technical field of nonferrous metal recycling 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, 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 for a longer period of time in the future, there is still a great value of existence. And 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 handled properly, it will cause serious harm to the environment and endanger human beings. of good health. On the other hand, ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B13/00
CPCY02P10/20
Inventor 张承龙王景伟白建峰
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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