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Method for green recovery of waste circuit boards by cyanide-free full-wet whole set process

A technology for waste circuit boards and processes, applied in the direction of improving process efficiency, can solve problems such as high energy consumption, complex processes, and complex recycling methods, and achieve the effects of easy industrial production, high metal recovery rate, and reduction of secondary pollution.

Inactive Publication Date: 2010-09-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have high equipment production costs, and finally obtain metal and non-metal powders, but they cannot completely obtain metal elements, and the added value is low.
Chinese patent 98105592.3 proposes a method for crushing and recycling metal elements, but the process is complicated, the recovery efficiency is low, the production equipment investment cost is high, and the energy consumption is large
In the Japanese patent JP2005000841 and the Chinese patent 20060117802.6, the recovery of metals such as copper and aluminum in waste circuit boards is mentioned, but the recovery method is complicated, the recovery efficiency is low, and the shortcoming of only one metal recovery makes it impossible to realize the recycling of waste circuit boards. Comprehensive recycling of valence metals
Chinese patent 200710176776.9 proposes a method for metal recovery by graded electrolysis of electronic waste, which can recover Cu, Zn, Pb, Ag, Au, Pt and other metals in circuit boards by electrolysis step by step, but this method requires strong acid such as aqua regia. Dissolution, aggravating the burden on the environment
At the same time, all metals are electrolyzed, which consumes a lot of energy and costs a lot to recycle.

Method used

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  • Method for green recovery of waste circuit boards by cyanide-free full-wet whole set process
  • Method for green recovery of waste circuit boards by cyanide-free full-wet whole set process
  • Method for green recovery of waste circuit boards by cyanide-free full-wet whole set process

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Effect test

Embodiment 1

[0036] figure 1 It is the overall implementation process flow chart of the method for green recycling of waste circuit boards in the cyanide-free full-wet complete process of the present invention. As shown in the figure, the waste circuit boards are first crushed with a jaw crusher, and then separated by winnowing to obtain miscellaneous copper powder and non-metallic powder, smelting and casting miscellaneous copper powder to obtain copper anode plate.

[0037] Put the copper anode plate in H 2 SO 4 and CuSO 4 Copper electrolytic purification is carried out in the mixed solution to obtain cathode copper and copper anode slime. Copper electrolytically purified H 2 SO 4 The concentration is 0.5mol / L, CuSO 4 The concentration is 1.5mol / L, the gelatin concentration is 100mg / L, the thiourea concentration is 120mg / L, and the current density is 130A / m 2 , the electrolysis temperature is 60°C. The purity of the obtained cathode copper reaches 4N level.

[0038] figure 2 I...

Embodiment 2

[0045] Firstly, the waste circuit board is crushed with a hammer crusher, and then miscellaneous copper powder and non-metallic powder are obtained by water separation, and the miscellaneous copper powder is smelted and cast to obtain a copper anode plate.

[0046] Put the copper anode plate in H 2 SO 4 and CuSO 4 Copper electrolytic purification is carried out in the mixed solution to obtain cathode copper and copper anode slime. Copper electrolytically purified H 2 SO 4 The concentration is 2mol / L, CuSO 4 The concentration is 1mol / L, the gelatin concentration is 50mg / L, the thiourea concentration is 100mg / L, and the current density is 100A / m 2 , The electrolysis temperature is 40°C. The purity of the obtained cathode copper reaches 4N level.

[0047] Copper anode slime and H 2 SO 4 , NaCl solution mixed, adding MnO 2 Carry out copper separation, filter to obtain copper separation liquid and copper separation slag. The copper separating solution is returned to the ...

Embodiment 3

[0054] First, the waste circuit boards are crushed with an impact crusher, and then miscellaneous copper powder and non-metallic powder are obtained by air separation, and the miscellaneous copper powder is smelted and cast to obtain a copper anode plate.

[0055] Put the copper anode plate in H 2 SO 4 and CuSO 4 Copper electrolytic purification is carried out in the mixed solution to obtain cathode copper and copper anode slime. Copper electrolytically purified H 2 SO 4 The concentration is 1mol / L, CuSO 4 The concentration is 0.5mol / L, the gelatin concentration is 300mg / L, the thiourea concentration is 300mg / L, and the current density is 250A / m 2 , The electrolysis temperature is 80°C. The purity of the obtained cathode copper reaches 4N level.

[0056] Copper anode slime and H 2 SO 4 , NaCl solution mixed, adding MnO 2 Carry out copper separation, filter to obtain copper separation liquid and copper separation slag. The copper separating solution is returned to th...

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Abstract

The invention provides a method for green recovery of waste circuit boards by a cyanide-free full-wet whole set process, and belongs to the field of recycle economy. The method comprises the following steps of: mechanically crushing waste circuit boards; separating by adopting gravitational segregation to obtain impure copper powder and non-metallic powder; smelting and casting the impure copper powder to obtain a copper anode plate; and performing copper electrolytic refining on the copper anode plate; separating copper, gold, solver, platinum-palladium, lead and tin in the copper anode mud so as to recover the valuable metals of copper, gold, solver, platinum-palladium, lead and tin therein and performing wastewater recycling. The overall recovery rate of metals in the waste circuit boards reaches over 98 percent, the cathode copper obtained by the copper electrolytic refining reaches 4N level, the copper removal rate in the copper anode mud reaches over 96 percent, the recovery rate of the gold reaches over 98 percent, the recovery of the platinum-palladium reaches over 96 percent, the recovery rate of the silver and lead reaches over 95 percent, and the recovery rate of the tin reaches over 90 percent. The method for the green recovery of the waste circuit boards has the characteristics of cyanide-free full-wet property, wastewater recycling, and no secondary pollution.

Description

technical field [0001] The invention relates to the field of recycling waste circuit boards, in particular to a green method for recycling waste circuit boards through a cyanide-free all-wet complete process, which is applied to recycling waste circuit boards. Background technique [0002] With the development of the economy and the advancement of science and technology, the advanced technologies of electronic appliances involved in the high-tech field emerge in an endless stream, making the electronic appliance industry one of the fastest-growing industries since the 20th century. Due to the use of a large number of electronic products and the advancement of related technologies, the cycle of scrapping and replacement of electronic products has been continuously shortened, and the amount of electronic waste is also increasing day by day. The United States is the world's largest producer of electronic products and electronic waste. The annual production of electronic waste i...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00C22B11/00C22B13/00C22B25/00
CPCC22B11/046C22B15/0056C25C1/12C22B7/00Y02P10/20
Inventor 张深根李彬潘德安田建军刘波
Owner UNIV OF SCI & TECH BEIJING
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