Method for treatment of solid materials

• US 5,411,213 A
• Filed: 04/29/1993
• Issued: 05/02/1995
• Est. Priority Date: 09/12/1990
• Status: Expired due to Term

• Current Assignee: Edwin W. Oldham
• Original Assignee: Arden L. Just
• Inventors: Just, Arden L.
• Primary Examiner(s): HAN, FRANCES CHIN
• Application Number:
  US08/057,048
• Time in Patent Office: 733 Days
• Field of Search: 241/16, 241/22, 241/97, 241/DIG. 31, 241/DIG. 38, 241/21, 241/41, 241/43, 241/62, 264/142, 264/380
• US Class Current: 241/16
• CPC Class Codes: B02C 23/06 Selection or use of additives to aid disintegrating
• CPC Class Codes: B02C 4/02 with two or more rollers
• CPC Class Codes: B29B 17/02 Separating plastics from other materials
• CPC Class Codes: B29B 17/0404 to powder
• CPC Class Codes: B29K 2021/00 Use of unspecified rubbers as moulding material
• CPC Class Codes: B29K 2105/06 containing reinforcements, fillers or inserts
• CPC Class Codes: B29L 2030/00 Pneumatic or solid tyres or parts thereof conveyor belts B29L2031/7092; drive belts B29L2031/7094; fourdrinier belts B29L2031/733
• CPC Class Codes: Y02W 30/62 Plastics recycling; Rubber recycling
• CPC Class Codes: Y10S 241/31 Rubber preparation

Abstract

A process for comminuting a commercial and/or municipal waste material, having an anti-agglomeration or partitioning agent thereon, by subjecting the material to a compressive shear force. The process can be applied successively until a desired particle size distribution is achieved. This process reduces tendency of solids as being milled to agglomerate together to form larger particles and eventually sheets by charging said solids to the mill with sufficient partitioning agent present to suppress agglomeration to increase the efficiency of the process.

Claims

1. A process for comminuting/pulverizing material to produce fine to powdery particles selected from the class consisting of commercial and municipal solids comprising the steps of:

forming a zone between two members with at least one member being moveable;

moving said material into and through said zone, said material having a partitioning agent thereon; and

subjecting said material to a compressive shear as said material passes into and through said zone to produce a fine to powdery material.

2. A process according to claim 1 wherein said process is repeated until a given particle size of less than 40 mesh is achieved.

3. A process according to claim 1 wherein said material is used tires.

4. A process according to claim 1 wherein said partitioning agent is selected from class consisting of water (or) and water containing a surfactant.

5. A process according to claim 4 wherein said water has from about 1% to about 20% of a surfactant.

6. A process according to claim 5 wherein said surfactant is selected from the group consisting of metal fatty acid salt, soaps, polymeric salts, anionic surfactants, ammonium salts, polyvinyl alcohol, polyvinyl acetate, ionomers, miscellaneous foaming surfactants and the like.

7. A process according to claim 1, wherein said process is repeated until a given particle size of less than 40 mesh is achieved.

8. A process according to claim 1, wherein said waste material is a vulcanized filled or untilled elastomer.

9. A process according to claim 1 wherein said partitioning agent is selected from the class consisting of water and water containing a surfactant.

10. A process according to claim 9, wherein said water has from about 1% to about 20% of said surfactant.

11. A process according to claim 9, wherein said surfactant is selected from the group consisting of metal fatty acid salt, soaps, polymeric salts, anionic surfactants, ammonium salts, polyvinyl alcohol, polyvinyl acetate, ionomers, miscellaneous foaming surfactants and the like.

12. A process for comminuting/pulverizing solid material or materials comprising the steps of:

(a) forming a zone between two rolls of a twin roll mill where one roll moves at the same or different rate from the other roll;

(b) moving said material into and through said zone, said material having a partitioning agent thereon; and

(c) subjecting said material to a compressive shear as said material passes into and through said zone;

(d) repeating step a-c until a given particle size is achieved; and

(e) subjecting each of particles to a separation means whereby each of particles are separated into distinct materials to exit dry to feel.

13. A process according to claim 12, wherein said separation means is a cyclone separator.

14. A process according to claim 12, wherein said separation means is a magnetic separator.

15. A process according to claim 12, wherein said particles are fed to a screen separator.

16. A method of milling semi-solid to solid material to reduce tendency of particles formed agglomerating and sheeting together to give a mill greater efficiency for producing fine to powdery particles comprising forming a zone between two rolls of said mill to form a gap having dimension from thicker than said material to essential that when said rolls are in contact with each other, feeding said material through said gap at a rate to maintain compression shear on said material to form smaller particles and contacting said feed material with sufficient partitioning agent to suppress tendency of said particles to agglomerate together in larger masses during each pass through said gap and exit said gap to give said particle a dry feel.

17. A method of producing a rubber masterbatch comprising passing rubber through a zone formed by two members with at least one being movable, supplying said rubber with a partitioning agent selected from the class consisting of water and water containing a surfactant to the zone, applying compressive shear in the zone to the rubber to whereby the rubber stops sheeting in the zone and disintegrates to form particles of about 50 mesh or less within about 10 to 30 passes through said zone to yield a rubber having particles of 50 mesh or less, compounding said rubber having particles of 50 mesh or less with compounding agents having a particle size of 50 mesh or less by stirring them together to yield a flowable powdery masterbatch and charging said masterbatch to a shaper and curing to give a cured article.