Grit blasting

Patent metadata

Field	Value
Publication number	US-12555698-B2
Application number	US-201916979412-A
Country	US
Kind code	B2
Filing date	Mar 12, 2019
Priority date	Mar 29, 2018
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

Provided is a process for blast cleaning comprising subjecting a work surface to a blast stream, wherein the work surface is metal that is contaminated with one or more radioactive moiety, wherein the blast stream comprises water and one or more resin particles.

First claim

The invention claimed is:

1 . A process for blast cleaning comprising contacting a work surface with a blast stream,
wherein the work surface is metal that is contaminated with one or more radioactive moiety, wherein the blast stream comprises water and one or more resin particles, wherein the resin is an ion exchange resin that is crosslinked, wherein the blast stream is propelled at the work surface, and wherein at least a part of the radioactive moieties is removed from the work surface and attached to the particles of ion exchange resin.

2 . The process of claim 1 , wherein the metal is steel.

3 . The process of claim 1 , wherein the radioactive moiety comprises one or more radioisotope of cobalt, nickel, or chromium.

4 . The process of claim 1 , wherein the radioactive moiety comprises 60 Co.

5 . The process of claim 1 , wherein the resin particles comprise styrenic resin.

6 . The process of claim 1 , wherein the resin particles comprise particles of one or more ion exchange resin selected from the group consisting of ion exchange resins having covalently bound sulfonic groups;
ion exchange resins having covalently bound carboxylic groups; ion exchange resins having covalently bound secondary amine groups; ion exchange resins having covalently bound tertiary amine groups; ion exchange resins having covalently bound quaternary ammonium groups; and mixtures thereof.

7 . The process of claim 1 , wherein the pH of the blast stream is 4 or lower.

8 . The process of claim 1 , wherein the blast stream has a temperature of 15° C. to 35° C.

9 . The process of claim 1 , wherein the ion exchange resin comprises from 2 to 15% of polymerized units of multifunctional vinyl monomer, by weight based on the weight of the resin.

10 . The process of claim 1 , wherein the ion exchange resin is fully crosslinked.

11 . The process of claim 1 , wherein the blast stream is forced through a nozzle, and the pressure of the blast stream in the inside of the nozzle is 1 megapascal or higher.

12 . The process of claim 1 , wherein the blast stream is propelled by a pump.

13 . The process of claim 1 , wherein the blast stream is combined with a stream of compressed air to form a mixed stream.

14 . The process of claim 13 , wherein the blast stream is a slurry, and wherein ratio of air to slurry is 0.05:1 or higher.

Assignees

• Ddp Specialty Electronic Materials Us Llc
• Ddp Specialty Electronic Materis Us Llc

Inventors

• Hailemariam Leaelaf Mengistu
• Majamaa Katariina

Classifications

• G21F9/12

  by absorption; by adsorption; by ion-exchange · CPC title

• G21F9/005

  Decontamination of the surface of objects by ablation · CPC title

• B24C1/08

  for polishing surfaces, e.g. {smoothing a surface} by making use of liquid-borne abrasives · CPC title

• B24C11/00

  Selection of abrasive materials {or additives} for abrasive blasts (polishing compositions C09G) · CPC title

• G21F9/30 Primary

  Processing (separating different isotopes of the same chemical element B01D59/00) · CPC title