# US 5,700,425 A · Device for the pretreatment of electronic scrap

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- Number: US 5,700,425 A
- Document ID: US5700425A
- Status: Granted
- Kind: A
- Application number: 08/332,142
- Filed: 1994-10-31
- Granted: 1997-12-23
- Earliest claimed: 1993-11-03
- Inventors: Antonio Maria Celi
- Web page: https://patentgrep.com/patent/US5700425A

## CPC

- C22B 11/025: {from manufactured products, e.g. from printed circuit boards, from photographic films, paper, or baths}
- C22B 1/005: {Preliminary treatment of scrap (C22B1/02 - C22B1/26 take precedence)}
- C22B 7/001: {Dry processes}
- Y02P 10/20: Recycling
- C22B: PRODUCTION AND REFINING OF METALS (electrolytic C25); PRETREATMENT OF RAW MATERIALS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A device for the pretreatment of electronic scrap, comprising a scroll cylinder (1) with a worm screw (2) inside it, endowed with inputs and outputs for thermal exchange fluid (13, 8) and electronic scrap to be treated (6, 14); a furnace comprising sucha device, further comprising input (9, 11) and output (23, 24) air barriers; a refrigerator comprising such a device too; as well as a proces for the pretreatment of electronic scrap making use of such a furnace and refrigerator.

## Claims

### Claim 1

A device for the pretreatment of electronic scrap, which comprises
a cooling cylinder (1') and a working cylinder (1), said working cylinder having a worm screw (2) fixed on an inner surface, and input and output ends;
means (20, 21, 22) for rotating said working cylinder (1) selectively in opposite directions;
means for inputting (6, 6') and means for removing (14) respectively into and from said working cylinder (1) electronic scrap to be treated, and
means for inputting (13; 25) and means for removing (8) inert gas as thermal exchange fluid respectively into and from said working cylinder (1).

### Claim 2 (depends on 1)

The device for the pretreatment of electronic scrap according to claim 1, further characterized in that
the worm screw (2) of said working cylinder (1) is provided at several points by walls (3) arranged diametrically as a radial crown with respect to the cylinder;
said means for inputting electronic scrap into said cylinder comprises a charging tube (6) with an end that opens into said working cylinder (1), and with an opposite end at the outside constituting an inlet for charging electronic scrap (6');
said means for removing said thermal exchange fluid from said working cylinder (1) are made up of an opening (8) through said charging tube (6);
means (10) on said charging tube (6) for temporally selectively admitting electronic scrap into an interior of said working cylinder (1);
means providing an air barrier (9; 11) between said charging inlet (6') and said means (10) for temporally selectively admitting electronic scrap;
said means for removing pretreated electronic scrap from said working cylinder (1) being made up of an exhaust conveyor (14) from said cylinder (1);
said means for inputting thermal exchange fluid into said cylinder (1) comprising a delivery manifold (13);
said means for removing electronic scrap (14) having an air barrier (23, 24) downstream of said delivery manifold (13).

### Claim 3 (depends on 1)

The rotary furnace for the pretreatment of electronic scrap according to claim 1, wherein said means for inputting electronic scrap into said working cylinder comprises a hermetic closure (10).

### Claim 4 (depends on 2)

The rotary furnace for the pretreatment of electronic scrap according to claim 2, wherein
said air barrier is made up of an air jet fed through a delivery opening (23) into said means for removing scrap (14) and removed through a suction opening (24) opening into said means for removing scrap.