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Method for extracting gold from waste and old circuit board

A technology of waste circuit boards and circuit substrates, which is applied in the direction of improving process efficiency, etc., can solve the problems of high safety operation cost, waste water and waste gas discharge, etc., achieve high gold leaching rate, low treatment cost, and reduce treatment costs.

Inactive Publication Date: 2012-01-25
HUAXING GROUP ENVIRONMENTAL PROTECTION IND DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method discharges a lot of waste water and waste gas, and the safety operation cost of workers is relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for extracting gold from waste circuit boards, the specific steps are:

[0034] Step (1), removing the solder and electronic components on the waste circuit board to form a circuit substrate; adding hydrogen peroxide and a corrosion inhibitor to a potassium iodide solution with a mass ratio of 8:1 to configure a potassium iodide solution mixture; the potassium iodide solution is mixed The mass concentration of potassium iodide in the solution is 5%, the mass concentration of the oxidizing agent is 1.2%, and the mass concentration of the corrosion inhibitor is 0.10%.

[0035] Step (2), after cleaning the circuit substrate three times in clear water, soak it in the potassium iodide solution mixture, and react for 3 minutes under the condition of 10, and accompanied by bubbling and stirring, the deplating rate is 100% Then clean the circuit substrate with clear water, the resulting cleaning solution flows into the potassium iodide solution mixed solution to obtain...

Embodiment 2

[0038] It differs from Example 1 in that:

[0039] In step (1), add hydrogen peroxide and corrosion inhibitor in the potassium iodide solution that mass ratio is 20: 1, be configured into potassium iodide solution mixed solution; The potassium iodide mass concentration in described potassium iodide solution mixed solution is 25%, the oxidant mass concentration is 10 %, corrosion inhibitor mass concentration 5%.

[0040] In step (2), the circuit substrate is washed three times in clean water, then soaked in the potassium iodide solution mixture, and reacted at 80° C. for 5 minutes with bubbling and stirring.

Embodiment 3

[0042] It differs from Example 1 in that:

[0043] In step (1), add hydrogen peroxide and corrosion inhibitor in the potassium iodide solution that mass ratio is 12: 1, be configured into potassium iodide solution mixed solution; The potassium iodide mass concentration in described potassium iodide solution mixed solution is 12%, the oxidant mass concentration is 4% %, corrosion inhibitor mass concentration 1%.

[0044] In step (2), the circuit substrate is washed three times in clean water, then soaked in the potassium iodide solution mixture, and reacted at 35°C for 4 minutes with bubbling and stirring.

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PUM

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Abstract

The invention relates to a method for extracting gold from a waste and old circuit board, which comprises the following specific steps of: adding an oxidizing agent and a corrosion inhibiting agent into a potassium iodide solution to prepare into a mixed potassium iodide solution; immersing the circuit board in the mixed potassium iodide solution, and reacting for 3-5 min under the condition of 10-80 DEG C while stirring; then, washing the circuit board with clean water, guiding the obtained washing liquid into the mixed potassium iodide solution to obtain a mixed washing liquid; and filtering the mixed washing liquid, absorbing foreign ions through ion exchange, and adding a reducing agent to obtain sponge gold after a reduction reaction. In the invention, the method for leaching gold by using nontoxic iodide is adopted, so that high gold leaching rate is realized, the hazard-free, reduction and recycling treatment of electronic waste is realized, and the treatment cost is low. The used iodide solution can be recycled after reduction, the secondary gold leaching effect is unchanged, environmental pollution can be further reduced, and the treatment cost is lowered.

Description

technical field [0001] The invention relates to the technical field of processing and recycling waste electronic products, in particular to a method for extracting gold from waste circuit boards. Background technique [0002] With the continuous upgrading of electronic industry technology and the continuous improvement of society's demand for electronic consumer products, the speed of electronic products being discarded and eliminated is getting faster and faster. As an important part of electronic products --- electronic circuit boards, the amount of waste is also increasing day by day. Discarded circuit boards are hazardous wastes, which bring huge problems to social production and life, and pose serious challenges to the environment. Therefore, their rational treatment and disposal have become an urgent problem in economic development. [0003] In addition to containing a large amount of epoxy resin, the circuit board also contains a large amount of rare and precious met...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 张海青白庆田王建明
Owner HUAXING GROUP ENVIRONMENTAL PROTECTION IND DEV
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