Process for the recycling of electrical batteries, assembled printed circuit boards and electronic components

• US 4,874,486 A
• Filed: 12/03/1987
• Issued: 10/17/1989
• Est. Priority Date: 12/12/1986
• Status: Expired due to Fees

• Current Assignee: Recytec SA
• Original Assignee: Recytec SA
• Inventors: Hanulik, Jozef
• Primary Examiner(s): TUFARIELLO, THOMAS
• Application Number:
  US07/128,398
• Time in Patent Office: 684 Days
• Field of Search: 204/105 R, 204/109, 204/111, 204/130, 204/140, 204/146
• US Class Current: 205/704
• CPC Class Codes: C22B 1/005 Preliminary treatment of scrap C22B1/02 - C22B1/26 take precedence
• CPC Class Codes: C22B 11/025 from manufactured products, e.g. from printed circuit boards, from photographic films, paper, or baths
• CPC Class Codes: C22B 13/045 Recovery from waste materials
• CPC Class Codes: C22B 7/001 Dry processes
• CPC Class Codes: H01M 10/54 Reclaiming serviceable parts of waste accumulators
• CPC Class Codes: H01M 6/52 Reclaiming serviceable parts of waste cells or batteries , e.g. recycling
• CPC Class Codes: Y02P 10/20 Recycling
• CPC Class Codes: Y02W 30/84 Recycling of batteries or fuel cells

Abstract

For the recycling of electrical batteries, in particular of a mixture of high-power batteries for equipment of any chemical composition, and also of assembled printed circuit boards and electronic components, a pyrolysis of the unsorted mixture is carried out at a temperature between 450° and 650° C., then an electrolysis of the pyrolysis slag is carried out and subsequently a separation of the electrolysis products and removal of the products accumulating at the electrodes is carried out.

In this process, which is economically profitable, no environment-polluting residues are produced and an initial sorting of material becomes unnecessary.

Claims

1. A process for the recycling of electrical batteries for equipment of any chemical composition, and of assembled printed circuit boards and electronic components, the starting materials being heated and metals present in the residue being electrolytically deposited, wherein:

(a) a pyrolysis of the unsorted mixture is carried out in a closed furnace at a temperature between 450°

C. and 650°

C.;

(b) The pyrolysis slag is treated with water or with forofluoric wash acid diluted with water and filtered;

(c) the filter cake is dissolved in borofluoric acid solution;

(d) said borofluoric acid solution is used as an electrolyte for carrying out an electrolysis of the dissolved pyrolysis slag in a low-temperature range;

(e) a separation of the anode sludge and the cathode sludge accumulating under both electrodes is carried out, and these sludges are treated for reutilization of the resulting products.

2. The process as claimed in claim 1, wherein the gaseous pyrolysis products are first passed through a condenser, then washed in countercurrent with 5-10% borofluoric acid and returned to the condenser as coolant, are subsequently extracted through a cyclone separator and dust filter and finally combusted with air.

3. The process as claimed in claim 1, wherein the electrolysis of the pyrolysis slag is carried out in a solution of the electrolyte.

4. The process as claimed in claim 3, wherein the metals accumulating in the cathode space during the electrolysis are separated metallurgically, electrochemically or chemically, after which they can be supplied for a reutilization.

5. The process as claimed in claim 3, wherein the sludge accumulating in the anode space during the electrolysis is separated off and can be supplied to the battery manufacturer for reutilization.

6. The process as claimed in claim 1, wherein, to regenerate the electrolyte used during the electrolysis, the substances dissolved therein are crystallized out and separated off.

7. The process as claimed in claim 1, wherein the borofluoric acid solution is regenerated by distillation and the regenerated borofluoric acid is reused as an electrolyte solvent and wherein the bottom products developed during said distillation are converted by pyrolysis into fluorides which can be supplied to the industry for reutilization.

8. Process according the claim 1, wherein the filtrated collected according to claim 1 (b) is supplied to a filtrated system to recover the salts present therein.

10. The process as claimed in claim 1, wherein the metals accumulating in the cathode space during the electrolysis are separated metallurgically, electrochemically or chemically, after which they can be supplied for reutilization, and wherein the sludge accumulating in the anode space during the electrolysis is separated off and can be supplied to the battery manufacturer for reutilization.

11. The process as claimed in claim 10, wherein the base metals dissolved in the electrolyte during the electrolysis are separated continuously or batchwise at a mercury cathode as amalgums.

12. The process as claimed in claim 10, wherein the anode sludge accumulating during the electrolysis is treated with borofluoric acid to separate off metal traces and the undissolved residue which may then be supplied to the battery manufacturer for reutilization is filtered off.

13. The process as claimed in claim 1, wherein the electrolyte solution is kept at an operating temperature between 40°

C. and 80°

C. during the electrolysis, and the current density is set at 20 to 50 A/dm².

9. The process as claimed in claim I, wherein the anode is not directly in contact with the electrolyte but only by means of the material of the filter cake.