Method for detoxifying asbestos

Patent metadata

Field	Value
Publication number	US-10729926-B2
Application number	US-201816098389-A
Country	US
Kind code	B2
Filing date	Jul 6, 2018
Priority date	Mar 28, 2018
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

The method for detoxifying asbestos disclosed here includes: preparing an asbestos-containing substance that contains at least one type of asbestos; preparing an asbestos treatment agent that contains a mineral acid, N-methyl-2-pyrrolidone and a fluoride; and bringing the asbestos-containing substance into contact with the asbestos treatment agent so as to detoxify asbestos in the asbestos-containing substance. Due to this configuration, asbestos in the asbestos-containing substance can be favorably detoxified.

First claim

The invention claimed is:

1. A method for detoxifying asbestos, the method comprising:
preparing an asbestos-containing substance that contains at least one type of asbestos;
preparing an asbestos treatment agent that contains a mineral acid, N-methyl-2-pyrrolidone and a fluoride; and
bringing the asbestos-containing substance into contact with the asbestos treatment agent so as to detoxify asbestos in the asbestos-containing substance.

2. The method for detoxifying asbestos according to claim 1 , wherein the asbestos-containing substance contains at least one of amosite and crocidolite.

3. The method for detoxifying asbestos according to claim 1 , wherein the mineral acid is sulfuric acid.

4. The method for detoxifying asbestos according to claim 1 , wherein the asbestos-containing substance is brought into contact with the asbestos treatment agent for a period of 2 hours or longer.

5. The method for detoxifying asbestos according to claim 1 , wherein the asbestos treatment agent is heated to a temperature range that is higher than 50° C. and lower than the boiling point of the treatment agent before the asbestos-containing substance is brought into contact with the asbestos treatment agent.

6. The method for detoxifying asbestos according to claim 1 , wherein the asbestos-containing substance that is brought into contact with the asbestos treatment agent is in the form of a powder.

7. The method for detoxifying asbestos according to claim 1 , wherein the fluoride is a compound selected from the group consisting of a fluoride salt of ammonia, a fluoride salt of alkali metal, a fluoride salt of alkaline earth metal, a hydrofluoric acid of ammonia, a hydrofluoric acid of alkali metal and a hydrofluoric acid of alkaline earth metal.

8. The method for detoxifying asbestos according to claim 1 , wherein the concentration of the fluoride is 5 to 25 wt % when the asbestos treatment agent as a whole is taken to be 100 wt %.

9. The method for detoxifying asbestos according to claim 1 , wherein the concentration of the N-methyl-2-pyrrolidone is 0.1 to 10 wt % when the asbestos treatment agent as a whole is taken to be 100 wt %.

Assignees

• Kokigumi Co Ltd
• Nat Univ Corp Tottori Univ

Inventors

• Myoga Toshimitsu
• Takahashi Koichi
• Iizuka Kazuhiro
• Matsubara Yuhei
• Tanaka Toshiyuki
• Okamoto Hisaki

Classifications

• B09B3/70

  Chemical treatment, e.g. pH adjustment or oxidation (involving an extraction step B09B3/80) · CPC title

• B09B3/35

  Shredding, crushing or cutting · CPC title

• B09B2101/35

  Asbestos · CPC title

• A62D2101/40

  Inorganic substances · CPC title

• A62D2101/20

  Organic substances · CPC title