Method of recovering metals in circuit boards in classified manner

A technology of circuit boards and metals, which is applied in the field of metal classification and recycling circuit boards, to avoid operational hazards, improve product purity, and avoid pollution effects

Inactive Publication Date: 2018-11-06
ZHAOQING HI TECH ZONE GUOZHUAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it overcomes the disadvantages that noble metals enter the solution in the form of ions, and need to use strong reducing agents for chemical extraction again.

Method used

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  • Method of recovering metals in circuit boards in classified manner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Weigh 10kg of waste PCB boards whose surface process is chemical immersion gold. Use a cyclone pulverizer to pulverize and pass through a 50-mesh sieve, and the coarse particles continue to pulverize to pass through the sieve and transfer to 20L of H2O with a concentration of 1mol / L. 2 SO 4 After soaking in the solution for 24 hours, dissolve and leach nickel and tin into the solution, and filter to obtain a mixed solution of nickel sulfate and tin sulfate; the filter residue is transferred to the rotating electrolysis anode group and connected to the positive pole of the power supply, and the negative pole is connected to the arc-shaped stainless steel plate. The electrolyte consists of 3 mol / L CuSO 4 , 1 mol / L H 2 SO 4 and 0.01g / L Mn(SO 4 ) 2 Composition, the center distance between the anode group and the corresponding cathode steel plate is controlled to be 15cm, the minimum distance is 5cm, the electrolysis is carried out at a constant voltage of 10V, and the ...

Embodiment 2

[0040] Weigh 10kg of waste PCB boards whose surface process is OSP. Use a mechanical pulverizer to pulverize and pass through a 50-mesh sieve, and the coarse particles continue to be pulverized to pass through the sieve; transfer to 20 L of H 2 SO 4 After soaking in the solution for 24 hours, dissolve and leach nickel and tin into the solution, and filter to obtain a mixed solution of nickel sulfate and tin sulfate; The electrolyte consists of 1mol / L CuSO 4 , 3mol / LH 2 SO 4 and 0.01g / L Fe 2 (SO 4 ) 3 Composition, the center distance between the anode group and the corresponding cathode steel plate is controlled to be 15cm, the minimum distance is 5cm, the electrolysis is carried out at a constant voltage of 10V, the mixer is turned on at the same time during electrolysis, the rotation speed is 600 r / min, and air is blown at the bottom, After 5 hours of electrolysis, 0.59 kg of copper was recovered at the cathode, and resin powder and metal slime were collected in the anod...

Embodiment 3

[0042] The surface process is a mixture of waste PCB boards with chemical immersion gold and OSP, weighing 10Kg. And pass through the sieve screen of 50 meshes, coarse particles continue to pulverize, to pass through the sieve screen; 2 SO 4 After soaking in the solution for 24 hours, dissolve and leach nickel and tin into the solution, and filter to obtain a mixed solution of nickel sulfate and tin sulfate; The electrolyte consists of 4mol / L CuSO 4 , 3mol / L H 2 SO 4 and 0.01g / L Fe 2 (SO 4 ) 3 Composition, the center distance between the anode group and the corresponding cathode steel plate is controlled to be 15cm, the minimum distance is 5cm, the electrolysis is carried out at a constant voltage of 10V, the mixer is turned on at the same time during electrolysis, the rotation speed is 600 r / min, and air is blown at the bottom, After 5 hours of electrolysis, 0.64 kg of copper was recovered at the cathode, and resin powder and metal slime were collected in the anode fil...

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Abstract

The invention relates to a method of recovering metals in circuit boards in a classified manner, in particular to a method of recovering copper, tin, nickel, palladium, gold, silver and resin in PCBs.The method successively comprises the following steps: crushing the circuit boards into fine fragments through process flows such as crushing, acid leaching, anode rotating rattling electrolysis andflotation; then acid-leaching the fine fragments to dissolve active metal tin or nickel; then placing insoluble substances in an anode rotating rattling electrolytic cell to be electrolyzed to recovercopper; then filtering the mixture to obtain an anode filter residue, transferring the anode filter residue to water or heavy oil to be floated, wherein noble metals are settled and resin drifts on the surface by means of density variation of the metals, resin and a solvent, and recovering resin powder in the upper layer; and finally, further separating the noble metals by means of smelting. Themethod provided by the invention is an environment-friendly process which can separate and recover various metals and resins from waste circuit boards, so that all resources in the circuit boards arerecovered.

Description

technical field [0001] The invention relates to a method for classifying and recycling metals in circuit boards, in particular to separating and recycling various metals and resins from waste circuit boards in the printed circuit industry. Background technique [0002] In the multi-layer circuit board manufacturing technology, the pattern circuit is generally produced on the copper layer on the surface of the substrate through the imaging transfer and etching process, and then the copper and the prepreg (composed of insulating resin and glass fiber) are laminated and laminated layer by layer. Into a semi-finished product, and then covered with a layer of ink solder mask for anti-soldering effect, and then metallized surface treatment on the pad, surface treatment includes immersion gold, nickel palladium gold, immersion silver, spray tin and OSP (organic solder protection film ) and other processes, after the circuit board is manufactured, the components need to be mounted. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C25C1/12C25C7/02C22B11/00C22B11/02C22B15/00C22B23/00C22B25/06
CPCC22B7/007C22B11/025C22B11/046C22B15/0069C22B15/0071C22B23/0423C22B23/043C22B25/04C22B25/06C25C1/12C25C7/02Y02P10/20
Inventor 罗志勤
Owner ZHAOQING HI TECH ZONE GUOZHUAN TECH CO LTD
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