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A method for separating amphoteric metals in waste circuit board powder

A technology for waste circuit boards and amphoteric metals, which is applied in the field of separation of amphoteric metals in waste circuit board powder, can solve the problems of low contact and collision probability, large medium consumption, and no relative motion, etc., to increase relative motion and collision, time The effect of shrinking and reducing consumption

Active Publication Date: 2017-04-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese published patent CN102747229A (publication date 2012.10.24) proposes a method for separating and recycling valuable metals in multi-metal enriched powder of waste circuit boards, using NaOH-NaNO 3 Liquid-phase smelting system converts lead, tin, zinc and antimony in waste circuit boards, and through water leaching, Na 2 Two-step leaching, such as S leaching, realizes the efficient separation of amphoteric metals and copper, but the alkaline smelting system used in this method is a static system, there is no relative movement between the material and the melt, the probability of contact and collision is relatively low, and the medium consumption is large. , and with higher price NaOH, NaNO 3 Preparation of smelting system, high cost

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  • A method for separating amphoteric metals in waste circuit board powder
  • A method for separating amphoteric metals in waste circuit board powder

Examples

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Effect test

Embodiment 1

[0031] A method for separating amphoteric metals in waste circuit board powder of the present invention comprises the following steps:

[0032] 1) Mixed-phase alkali fusion: Take 100g of waste circuit board powder and 200g of NaOH and mix them thoroughly, put them into a special crucible and place them in a well-type furnace, and blow oxygen into the crucible through 3 ventilators at the same time (the flow rate is 1L / min), the well-type furnace was heated to 450°C for constant temperature smelting for 60 minutes to obtain smelted products.

[0033] 2) Rapid cooling and leaching:

[0034] After the crucible is taken out of the pit furnace, it is quenched in cold water, and then the smelted product is taken out (photo as figure 1 As shown, melt 1, bubble 2 and solid slag 3 can be seen from the figure; melt 1 is amphoteric metal sodium salt and alkali medium; bubble 2 is wrapped in melt 1; solid slag 3 and melt 1), Crush until the particle size is 0.1~5mm; then add water accord...

Embodiment 2

[0039] A method for separating amphoteric metals in waste circuit board powder of the present invention comprises the following steps:

[0040] 1) Mixed-phase alkali fusion: take waste circuit board powder 100g, NaOH 250g, NaNO 3 After 20g is fully mixed, put it into a special crucible and place it in a well-type furnace. At the same time, air is blown into the crucible through 3 ventilation pipes (the flow rate is 2L / min), and the temperature of the well-type furnace is raised to 550°C for 40 minutes of constant temperature melting. , to obtain the smelted product.

[0041] 2) Rapid cooling and leaching:

[0042] Take the crucible out of the pit furnace, place it in cold water for rapid cooling, then take out the smelted product and crush it to a particle size of 0.1~5mm; then add water according to the liquid-solid mass ratio of water: smelted product of 30:1, stir and dissolve at room temperature Leach for 40min, filter to obtain washing residue and alkaline washing solut...

Embodiment 3

[0046] A method for separating amphoteric metals in waste circuit board powder of the present invention comprises the following steps:

[0047] 1) Miscible alkali fusion: Take 100g of waste circuit board powder, Na 2 CO 3 450g, NaNO 3 After 50g is fully mixed, put it into a special crucible and place it in a well-type furnace. At the same time, air is blown into the crucible through 3 ventilation pipes (the flow rate is 1L / min), and the temperature of the well-type furnace is raised to 800°C for 30 minutes of constant temperature melting. , to obtain the smelted product.

[0048] 2) Rapid cooling and leaching:

[0049] Take the crucible out of the well-type furnace, place it in cold water for rapid cooling, then take out the smelted product, and crush it to a particle size of 0.1~5mm; then add water according to the liquid-solid mass ratio of water: smelted product of 40:1, stir and dissolve at room temperature Leach out for 60 minutes, filter to obtain washing residue and...

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Abstract

The invention discloses a method for separating amphoteric metal in waste circuit board powder. The method comprises the following steps: 1) mixed-phase alkali fusion: the waste circuit board powder is uniformly mixed according to the mass ratio of 1: 1-7: 0-1 among the powder, an alkaline medium and an auxiliary oxidizing agent, and then is smelted under the condition of 400-900 DEG C; oxidation gas is fed into a melt in the smelting process; and a smelting product is obtained in 20-90 min of the smelting; and 2) rapid cooling infiltration: the smelting product is put in cold water for rapid cooling, and then is crushed; and water is added according to the liquid-solid mass ratio of 40-10: 1 between the water and the smelting product, is stirred and leached for 10-60 min at normal temperature, and is filtered to obtain washery slag enriched with copper and noble metal and alkaline rinse containing the amphoteric metal. The gas-liquid-solid phases of the reaction system coexist in the smelting process; and the oxidation gas is added to reduce the addition of expensive auxiliary oxidizing agent and to increase relative motion and collision among materials.

Description

technical field [0001] The invention relates to a method for separating amphoteric metals in waste circuit board powder, in particular to a method for separating amphoteric metals in waste circuit board powder by using mixed-phase alkali fusion. Background technique [0002] With the rapid development of the electronic information industry, the replacement speed of electronic products is gradually accelerating, and the disposal of electronic waste has become one of the problems that need to be solved urgently in the world. The circuit board is one of the most important components of electronic devices, which contains a large amount of available common metals, rare and precious metals, reinforced resins, glass fibers, etc. If the waste circuit boards are disposed of randomly, it will not only cause serious harm to the environment, but also cause serious damage to the environment. Great waste of resources. At present, there are many methods for recycling valuable metals in wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B11/00C22B15/00
CPCY02P10/20
Inventor 郭学益刘静欣田庆华李栋刘旸
Owner CENT SOUTH UNIV
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