Method for detoxifying asbestos, and treatment agent used in the method

Patent metadata

Field	Value
Publication number	US-2019358480-A1
Application number	US-201816098389-A
Country	US
Kind code	A1
Filing date	Jul 6, 2018
Priority date	Mar 28, 2018
Publication date	Nov 28, 2019
Grant date	—

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

1 - 11 . (canceled)

12 . 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.

13 . The method for detoxifying asbestos according to claim 12 , wherein the asbestos-containing substance contains at least one of amosite and crocidolite.

14 . The method for detoxifying asbestos according to claim 12 , wherein the mineral acid is sulfuric acid.

15 . The method for detoxifying asbestos according to claim 12 , wherein the asbestos-containing substance is brought into contact with the asbestos treatment agent for a period of 2 hours or longer.

16 . The method for detoxifying asbestos according to claim 12 , 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.

17 . The method for detoxifying asbestos according to claim 12 , wherein the asbestos-containing substance that is brought into contact with the asbestos treatment agent is in the form of a powder.

18 . The method for detoxifying asbestos according to claim 12 , 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.

19 . The method for detoxifying asbestos according to claim 12 , 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 %.

20 . The method for detoxifying asbestos according to claim 12 , 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 %.

21 . An asbestos treatment agent used to detoxify asbestos in an asbestos-containing substance that contains at least one type of asbestos,
the asbestos treatment agent containing a mineral acid, N-methyl-2-pyrrolidone and a fluoride.

22 . The asbestos treatment agent according to claim 21 , wherein the mineral acid is sulfuric acid.

23 . The asbestos treatment agent according to claim 21 , 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.

24 . The asbestos treatment agent according to claim 21 , wherein the concentration of the fluoride is 5 to 25 wt % when the treatment agent as a whole is taken to be 100 wt %.

25 . The asbestos treatment agent according to claim 21 , wherein the concentration of the N-methyl-2-pyrrolidone is 0.1 to 10 wt % when the 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

• A62D2101/41

  Inorganic fibres, e.g. asbestos · CPC title

• A62D3/36 Primary

  Detoxification by using acid or alkaline reagents · CPC title

• 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