Patent US4661291A successfully refreshed from Google Patents.
US4661291A
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Method for fixation of incinerator ash or iodine sorbent
Assignee: Mitsui Engineering and Shipbuilding Co Ltd
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Filing: 1985-08-09
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Granted: 1987-04-28
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Expires: 2005-08-09
Abstract
Abstract According to the method of this invention for fixation of incinerator ash, incinerator ash containing SiO 2 and Al 2 O 3 is incorporated with NaOH or NaOH and an SiO 2 -containing substance in such an amount that the resulting mixture contains 25 to 90 wt % of SiO 2 , 2 to 10 wt % of Na 2 O, and more than 3 wt % of Al 2 O 3 which is less than the content of SiO 2 in terms of mol %; 100 parts by weight of the mixture is mixed with more than 5 parts by weight of water; and the resulting mixture is subjected to hydrothermal reaction under a pressure of 70 kg/cm 2 or above and at a temperature of 150° C. and above, whereby the fixation is accomplished. According to the method of this invention for fixation of iodine sorbent, iodine is allowed to be adsorbed on a silver-loaded silicate sorbent; the iodine sorbent is mixed with 1 to 30 wt % of at least one of sodium hydroxide, potassium hydroxide, and barium hydroxide; and the resulting mixture is subjected to hydrothermal reaction under a pressure of 70 kg/cm 2 and above and at a temperature of 150° C. and above, whereby the fixation is accomplished.
Inventors
- 👤 Nakamichi Yamasaki
- 👤 Takeshi Kubota
- 👤 Yoshihiro Hoshino
- 👤 Hiroyuki Tanuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:35
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/02; C; C04; C04B; C04B28/00; C04B28/02; C04B28/021; C04B28/18; C04B28/184; C04B2111/00; C04B2111/00474; C04B2111/00767; C04B2111/00784; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
147 words
A method for fixing incinerator ash containing SiO 2 and Al 2 O 3 , said method comprising incorporating the incinerator ash with NaOH or NaOH and an SiO 2 -containing substance in such an amount that resulting mixture contains ≅to 90 wt% of SiO 2 , 2 to 10 wt% of Na 2 O, and more than 3 wt% of Al 2 O 3 which is less than the content of SiO 2 in terms of mol%; mixing 100 parts by weight of the mixture with more than 5 parts by weight of water; and subjecting the resulting mixture to hydrothermal reaction under a pressure of 70 kg/cm 2 and above and at a temperature between 150° C. and 350° C. so that the mixture forms three-dimensional skeleton structure of alkali-containing aluminosilicate to fix and seal the incinerator ash with metals in the three-dimensional skeleton structure.
Claim 2
Independent Claim
147 words
A method for fixing incinerator ash containing SiO 2 and Al 2 O 3 , said method comprising incorporating the incinerator ash with NaOH or NaOH and an SiO 2 -containing substance in such an amount that resulting mixture contains ≅to 90 wt% of SiO 2 , 2 to 10 wt% of Na 2 O, and more than 3 wt% of Al 2 O 3 which is less than the content of SiO 2 in terms of mol%; mixing 100 parts by weight of the mixture with more than 5 parts by weight of water; and subjecting the resulting mixture to hydrothermal reaction under a pressure of 70 kg/cm 2 and above and at a temperature between 150° C. and 350° C. so that the mixture forms three-dimensional skeleton structure of alkali-containing aluminosilicate to fix and seal the incinerator ash with metals in the three-dimensional skeleton structure.
Claim 3
Dependent Claim
26 words
A method for fixing incinerator ash as claimed in claim 1, wherein NaOH and water are added in the form of an aqueous solution of NaOH.
Claim 4
Dependent Claim
22 words
A method for fixing incinerator ash as claimed in claim 1, wherein th SiO 2 -containing substance is silicastone or white clay.
Claim 5
Dependent Claim
44 words
A method for fixing incinerator ash as claimed in claim 1, in which said pressing procedure includes dividing the mixture into several parts, precompressing the respective parts separately, and pressing the several compressed parts at the same time under the predetermined pressure and temperature.
Claim 6
Dependent Claim
31 words
A method for fixing incinerator ash as claimed in claim 1, wherein water is added in an amount of 5 to 20 parts for 100 parts by weight of the mixture.
Claim 7
Dependent Claim
25 words
A method for fixing incinerator ash as claimed in claim 1, wherein the content of SiO 2 in the mixture is 30 to 60 wt%.
Claim 8
Dependent Claim
45 words
A method for fixing incinerator ash as claimed in claim 1, wherein the mixture contains one or more than one kind of metal oxide selected from Fe 2 O 3 , Cr 2 O 3 , MgO, CaO, TiO 2 , and K 2 O.
Claim 9
Dependent Claim
24 words
A method for fixing incinerator ash as claimed in claim 1, wherein the content of the metal oxide in the mixture is 40 wt%.
Claim 10
Dependent Claim
30 words
A method for fixing incinerator ash as claimed in claim 1, wherein the mixture contains SO 4 -- and/or Cl - in an amount less than 20 wt% in total.
Claim 11
Dependent Claim
20 words
A method for fixing incinerator ash as claimed in claim 1, wherein the heating temperature is 200° to 350° C.
Claim 12
Dependent Claim
23 words
A method for fixing incinerator ash as claimed in claim 1, wherein the time of hydrothermal reaction is 5 minutes to 1 hour.
Claim 13
Dependent Claim
55 words
A method for fixing incinerator ash as claimed in claim 1, wherein the hydrothermal reaction is accomplished by using an apparatus made up of a cylinder, a piston fitted into one end of the cylinder or two pistons fitted into both ends of the cylinder, and a reaction chamber at the center of the cylinder.
Claim 14
Independent Claim
89 words
A method for fixing iiodine sorbent which comprises allowing iodine to be adsorbed onto a silver-loaded silicate adsorbent, incorporating the iodine sorbent with 1 to 30 wt% of at least one of sodium hydroxide, potassium hydroxide, and barium hydroxide; and subjecting the resulting mixture to hydrothermal reaction under a pressure of 70 kg/cm 2 and above and at a temperature between 150° C. and 350° C. so that the mixture forms three-dimensional skeleton structure of alkali-containing aluminosilicate to fix and seal the iodine sorbent in the three-dimensional skeleton structure.
Claim 15
Independent Claim
89 words
A method for fixing iiodine sorbent which comprises allowing iodine to be adsorbed onto a silver-loaded silicate adsorbent, incorporating the iodine sorbent with 1 to 30 wt% of at least one of sodium hydroxide, potassium hydroxide, and barium hydroxide; and subjecting the resulting mixture to hydrothermal reaction under a pressure of 70 kg/cm 2 and above and at a temperature between 150° C. and 350° C. so that the mixture forms three-dimensional skeleton structure of alkali-containing aluminosilicate to fix and seal the iodine sorbent in the three-dimensional skeleton structure.
Claim 16
Dependent Claim
19 words
A method for fixing iodine sorbent as claimed in claim 13, wherein the silicate adsorbent is zeolite and/or mordenite.
Claim 17
Dependent Claim
24 words
A method for fixing iodine sorbent as claimed in claim 13, wherein the silicate adsorbent is loaded with 5 to 50 wt% of silver.
Claim 18
Dependent Claim
24 words
A method for fixing iodine sorbent as claimed in claim 13, wherein the silicate adsorbent is loaded with 10 to 40 wt% of silver.
Claim 19
Dependent Claim
31 words
A method for fixing iodine sorbent as claimed in claim 13, wherein water is added in an amount of 5 to 20 parts for 100 parts by weight of the mixture.
Claim 20
Dependent Claim
20 words
A method for fixing iodine sorbent as claimed in claim 13, wherein the heating temperature is 200° to 350° C.
Claim 21
Dependent Claim
23 words
A method for fixing iodine sorbent as claimed in claim 13, wherein the time of hydrothermal reaction is 5 minutes to 1 hour.
Claim 22
Dependent Claim
55 words
A method for fixing iodine sorbent as claimed in claim 13, wherein the hydrothermal reaction is accomplished by using an apparatus made up of a cylinder, a piston fitted into one end of the cylinder or two pistons fitted into both ends of the cylinder, and a reaction chamber at the center of the cylinder.
Claim 23
Dependent Claim
16 words
A method for fixing iodine sorbent as claimed in claim 13, wherein iodine is radioactive iodine.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |