Claims
- 1. A method for making a water purifier of manganese dioxide particles having macroscopic pores adapted to use in the purification of water, the method comprising immersing starting manganese dioxide powder in an acidic solution comprising from 5 to 80 g/liter of divalent manganese ions and from 5 to 100 g/l of an acid for a term of over 2 days at a temperature of from 80.degree. to 100.degree. C., reducing the resulting manganese dioxide mass into pieces, classifying the pieces to have a size of from 20 to 48 mesh, and neutralizing the pieces with an alkali whereby manganese dioxide particles having macroscopic pores through which water is able to pass and needle-like or columnar crystals on the surfaces thereof are obtained.
- 2. The method according to claim 1, wherein said starting manganese dioxide powder is of the gamma form, including up to 30% of manganese dioxide powder of any other form.
- 3. The method according to claim 1, wherein said acid is sulfuric acid.
- 4. The method according to claim 1, wherein said acidic solution further comprises up to 50 g/l of magnesium ions.
Priority Claims (1)
Number |
Date |
Country |
Kind |
58-111090 |
Jun 1983 |
JPX |
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Parent Case Info
This is a Divisional of application Ser. No. 615,781, filed May 31, 1984, now U.S. Pat. No. 4,551,254.
US Referenced Citations (9)
Foreign Referenced Citations (2)
Number |
Date |
Country |
56-32332 |
Apr 1981 |
JPX |
56-45829 |
Apr 1981 |
JPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
615781 |
May 1984 |
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