Vibrational separation of particles from viscous materials

• US 8,246,841 B2
• Filed: 08/20/2010
• Issued: 08/21/2012
• Est. Priority Date: 03/30/2005
• Status: Expired due to Fees

• Current Assignee: British Nuclear Technology
• Original Assignee: British Nuclear Technology
• Inventors: Hodgson, Kevin
• Primary Examiner(s): Popovics, Robert James
• Application Number:
  US12/859,839
• Publication Number:
  US 20100314332A1
• Time in Patent Office: 732 Days
• Field of Search: None
• US Class Current: 210/780
• CPC Class Codes: B01D 21/283 Settling tanks provided with vibrators
• CPC Class Codes: B03B 5/04 on shaking tables on vanners B03B5/08
• CPC Class Codes: B07B 13/113 shaking tables for wet separating B03B5/04; tables with water impulse B03B5/70; pneumatic tables B03B4/02; moving screens B07B1/28

Abstract

The invention provides a method for the separation of solids from a semi-solid viscous mass, the method comprising treating a solids-containing semi-solid viscous mass in an apparatus comprising a separating member incorporating a substantially flat solid surface and a supporting member, wherein the separating member is adapted to selectively impart directional momentum to the solids, thereby facilitating separation of the solids from the semi-solid viscous mass. Preferably the separating member comprises a substantially flat solid surface adapted for vibrational motion, the vibrational motion causing the solids material to be displaced from the remainder of the semi-solid viscous mass.

Claims

1. A method for the separation of solids from a semi-solid viscous mass including magnox fuel sludge, said method comprising:

a) introducing a solid-containing semi-solid viscous mass including magnox fuel sludge in an apparatus, wherein the apparatus comprises;

i) a separating member, wherein the separating member comprises a solid flat plate having four edge sides, wherein three of the four edges comprise a perimeter member wherein the fourth edge side does not include a perimeter member wherein the perimeter members are disposed substantially perpendicularly to the solid flat plate;

ii) supporting members comprising leaf springs and attached to the separating member on two sides of the solid flat plate, wherein the supporting members are positioned perpendicular and adjacent to the fourth edge side and wherein in operation the fourth edge side is disposed above the horizontal and the solid flat plate slopes down from the fourth edge side to the parallel opposite side of the member which is disposed below the horizontal; and

iii) mechanical or electromagnetic force means for vibrating the separating member thereby providing directional vibrational motion through inclination of the leaf springs positioned between the separating member and supporting member so that the separating member is moved through an arc imparting vibrational motion having both a vertical component in an upward direction and a horizontal component in the direction of the fourth edge of the separating member; and

b) vibrating the solid-containing semi-solid viscous mass including magnox fuel sludge in the separating member to cause the solids on the surface of the separating member to leave contact with the surface and be thrown forwards towards the fourth edge of the separating member until the solids reach the edge and are removed under the influence of gravity, thereby facilitating separation of said solids from said semi-solid viscous mass without dilution of said semi-solid viscous mass.

2. The method as claimed in claim 1 wherein said separating member is disposed at an angle of between 1°

and 10°

from the horizontal.

3. The method as claimed in claim 1 wherein the surface of said solid flat plate is fabricated of a material that demonstrates a different degree of adhesiveness to the solids than to the remainder of the semi-solid mass.

4. The method as claimed in claim 1 wherein said mechanical or electromagnetic forces means is provided by an out of balance motor drive or an electromagnet, respectively, to provide vibrational motion.

5. The method as claimed in claim 4 wherein the applied vibrational motion has a frequency in the region of from 5 to 50 Hz.

6. The method as claimed in claim 1 wherein the vibrational motion has an amplitude in the plane of the separating member is in the region of from 2 to 30 mm.