Global Patent Index - EP 0968032 A1

EP 0968032 A1 2000-01-05 - METHOD OF DECOMPOSING ASBESTOS-CONTAINING WASTES

Title (en)

METHOD OF DECOMPOSING ASBESTOS-CONTAINING WASTES

Title (de)

VERFAHREN ZUR ZERSETZUNG VON ASBESTHALTIGEN ABFÄLLEN

Title (fr)

PROCEDE POUR DECOMPOSER DES DECHETS CONTENANT DE L'AMIANTE

Publication

EP 0968032 A1 (EN)

Application

EP 97902371 A

Priority

  • FI 9700057 W
  • FI 960472 A

Abstract (en)

[origin: WO9727902A1] The invention relates to a method for neutralizing asbestos waste. According to the method, the waste is contacted with an acid capable of dissolving the asbestos, or with a salt thereof. According to the method, a hydrochloric acid solution is used as the acid, containing a suitable potassium salt in an amount of about 0.5 to 10 % based on the amount of the hydrochloric acid, in particular potassium sulphate, potassium chloride, potassium nitrate, potassium carbonate or potassium phosphate, and possibly a small amount of nitric acid and/or phosphoric acid. In order to enhance the dissolution of the asbestos, the waste is first wetted with water which may contain a surface activity reducing agent. The invention also relates to a method for disposing of the asbestos material in acetylene cylinders, whereby the acetylene cylinder is cut in two and the material is removed by hydrostatic pressure. Next, the wetted material is treated with a hydrochloric acid solution. The invention can also advantageously be applied to demolition waste from buildings.

IPC 1-7 (main, further and additional classification)

A62D 3/00; B09B 3/00

IPC 8 full level (invention and additional information)

A62D 3/36 (2007.01); B09B 3/00 (2006.01); C04B 14/40 (2006.01); C04B 18/04 (2006.01); A62D 101/41 (2007.01)

CPC (invention and additional information)

A62D 3/36 (2013.01); B09B 3/0066 (2013.01); C04B 14/405 (2013.01); C04B 18/0481 (2013.01); A62D 2101/41 (2013.01); Y02W 30/58 (2015.05); Y02W 30/91 (2015.05)

Combination set (CPC)

  1. C04B 18/0481 + C04B 14/40
  2. C04B 14/405 + C04B 20/023

Citation (search report)

See references of WO 9727902A1

Designated contracting state (EPC)

DE ES FR GB IT SE

EPO simple patent family

WO 9727902 A1 19970807; AU 1603597 A 19970822; EP 0968032 A1 20000105; FI 960472 A0 19960201; FI 960472 A 19970802

INPADOC legal status


2002-02-06 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20010801

2001-05-02 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20010321

2000-01-05 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19980831

2000-01-05 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE ES FR GB IT SE