US4017425A
Expired / Lapsed
US
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Method of activation of red mud
Assignee: Individual
•
Filing: 1972-11-10
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Granted: 1977-04-12
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Expires: 1992-11-10
Abstract
Abstract A method for activating the red mud formed in the Bayer alumina producing process for allowing its use as adsorbent, catalyst, ion-exchanging substance and clarifying substance, comprising a digesting red mud and dispersing the metal oxide compound particles in the compound of metal hydroxides and silica gel. The method comprises digesting red mud with acid, before adjusting the pH of the acid digested mixture comprising the sludge product to above 4 to disperse oxide compound in the compound the metal hydroxides and silica gel, and removing the residue acid employed from the gelating product with washing, then with or without shaping treating, and heat treating the product to provide a active red mud, particularly with respect to the catalytic cracking, decolorization of hydrocarbon, clarification of waste gas and adsorption processes.
Inventors
- 👤 Shing-Jen Shiao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:32
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60; B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J21/00; B01J21/02; B01J21/04; B01J39/00; B01J39/08; B01J39/09
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
Activated red mud for allowing its use as adsorbent, catalyst, clarifying substance and ion-exchanging substance is made from red mud of Bayer process by method comprising digesting red mud and dispersing the metal oxide compound particales in the compound of metal hydroxides and silica gel which comprises; a. digesting the red mud with acid, b. adjusting the pH of the acid digested mixture comprising the sludge product to above 4, c. separating and washing the gelation product, and, d. heat treating the resulting active compound under 800° C.
Claim 2
Dependent Claim
88 words
Activated red mud for allowing its use as adsorbent, catalyst, clarifying substance and ion-exchanging substance is made from red mud of Bayer process by method comprising digesting red mud and dispersing the metal oxide compound particales in the compound of metal hydroxides and silica gel which comprises; a. digesting the red mud with acid, b. adjusting the pH of the acid digested mixture comprising the sludge product to above 4, c. separating and washing the gelation product, and, d. heat treating the resulting active compound under 800° C.
Claim 3
Dependent Claim
64 words
The method of claim 1 further charaterized with respect to step (a) the quantity of the said acid selected from the group consisting of HCl, H 2 SO 4 , H 2 SO 3 , HNO 3 , HF and H 2 CO 3 , is that the mole ratio of acid, being used, to sodium contained in red mud is greater than 1.
Claim 4
Dependent Claim
44 words
The method of claim 2 further characterized with respsct to step (a) in that said digesting is carried out at a temperature above room temperature, preferably at about its boiling point under a good agitating condition for a period assuring the digestion is complete.
Claim 5
Dependent Claim
62 words
The method of claim 3 further characterized with respect to step (b) in that said pH adjusting comprising neutralizing the acid digested mixture with ammonium ion contained solution selected from the group consisting of NH 3 , NH 4 OH, (NH 4 ) 2 CO 3 and the decomposition of (NH 2 ) 2 CO by heating, to a value above 4.
Claim 6
Dependent Claim
44 words
The method of claim 4 further characterized with respect to step (b) in that said pH adjusting hereafter, aging the same at a temperature above room temperature, preferably at from about 50° to about 80° C for a period of at least 10 minutes.
Claim 7
Dependent Claim
34 words
The method of claim 5 further characterized with respect to step (c) in that said washing comprising washing the cake with water, preferably with warm water, to remove the residue anion of employed acid.
Claim 8
Dependent Claim
25 words
The method of claim 6 further characterized with respect to step (d) in that said heat treated product of hereabove process is crushed and sieved.
Claim 9
Dependent Claim
31 words
The method of claim 3 further characterized in that the product of step (a) is treated, prior to treatment in accordance with step (b), to remove a part of the solution.
Claim 10
Dependent Claim
74 words
The method of claim 6 further characterized in that the product of step (c) is treated, prior to treatment in accordance with step (d), in order to shape to a desired size at a pressure of above 300 kg/cm 2 or so by introducing into the model of shape machine, drying to a degree of water containing from about 20 to about 70% by weight on wet base first and then grinding and mixing.
Claim 11
Dependent Claim
159 words
The method of claim 6 further characterized in that the product of step (c) is treated, prior to treatment in accordance with step (d), in order to shape to a desired size at a pressure of under 300 kg/cm 2 by introducing into the model of shape machine by the method which comprises before drying to a degree of water containing from about 45 to about 70% on wet base, adding with or without 1-5% gelatine solution first, the product which is mixed and granulated in a size of from about 0.1 m/m to about 3 m/m , further drying to a degree of water containing from about 25 to about 40% on wet base and crushing a part of it, and mixing the crushed material with the no-crushed one in a proper ratio, and with a proper amount of antifriction selected from the group consisting of stearic acid, magnesium stearate and aluminum stearate; and iron oxide and alumina.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |