US3868227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Agglomerating fine alkali metal silicate particles to form hydrated, amorphous, granules
Assignee: PQ Corp
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Filing: 1972-04-05
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Granted: 1975-02-25
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Expires: 1992-04-05
Abstract
Abstract Readily soluble agglomerates of hydrated amorphous alkali metal silicates with widely varying but controlled bulk densities can be prepared by a 2-stage process involving agglomeration and drying. Specifically, the process comprises mixing alkali metal silicate solids and solutions in controlled amounts and under controlled conditions so that agglomerates are formed. These agglomerates are dried under certain conditions to produce products with desired particle properties.
Inventors
- 👤 Clarence H Gericke
- 👤 Richard H Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:02
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/08; B; B01; B01J; B01J2/00; B01J2/10; C01; C01B; C01B33/00; C01B33/20; C01B33/32; C01B33/325; C02; C02F; C02F5/00; C02F5/08; C02F5/083; C04; C04B; C04B12/00; C04B12/04; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6316
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
152 words
A PROCESS FOR PREPARING HYDRATED, AMORPHOUS, GRANULAR ALKALI METAL SILICATES HAVING AN SIO2/M2O MOLE RATIO OF 1.2/1.0 TO 4/0/1.0 COMPRISING: A. MIXING FINE, AMORPHOUS ALKALI METAL SILICATE PARTICLES S SELECTED FROM THE GROUP CONSISTING OF SODIUM SILICATE, POTASSIUM SILICATE AND SODIUM-POTASSIUM SILICATE AND AN AGGLOMERATING LIQUID WHICH IS AN ALKALI METAL SILICATE SOLUTION SELECTED FROM THE GROUP CONSISTING SODIUM SILICATE, POTASSIUM SILICATE AND SODIUM-POTASSIUM SILICATE, SAID MIXTURE CONTAINING BETWEEN 23 TO 33% MOISTURE, B. ENERGETICALLY MIXING SAID HEATING THE MIXTURE TO TEMPERATURES BETWEEN 120* AND 230*F. UNTIL IT GRANULATES, BECOMES FLOWABLE AND THE MOISTURE CONTENT IS BETWEEN 20 AND 27, C. CHARGING THE GRANULATED MIXTURE TO A ROTARY DRYER, AND D. CONDUCTING AIR THROUGH THE DRYER WITH AN INLET TEMPERATURE OF ABOVE 240*F AND AN OUTLET TEMPERATURE AOBVE 130*F TO DRY THE AGGLOMERATED MATERIAL TO FORM A HYDRATED, AMORPHOUS, GRANULAR ALKALI METAL SILICATE PRODUCT HAVING A MOISTURE CONTENT BETWEEN 15 AND 25%.
Claim 2
Dependent Claim
152 words
A PROCESS FOR PREPARING HYDRATED, AMORPHOUS, GRANULAR ALKALI METAL SILICATES HAVING AN SIO2/M2O MOLE RATIO OF 1.2/1.0 TO 4/0/1.0 COMPRISING: A. MIXING FINE, AMORPHOUS ALKALI METAL SILICATE PARTICLES S SELECTED FROM THE GROUP CONSISTING OF SODIUM SILICATE, POTASSIUM SILICATE AND SODIUM-POTASSIUM SILICATE AND AN AGGLOMERATING LIQUID WHICH IS AN ALKALI METAL SILICATE SOLUTION SELECTED FROM THE GROUP CONSISTING SODIUM SILICATE, POTASSIUM SILICATE AND SODIUM-POTASSIUM SILICATE, SAID MIXTURE CONTAINING BETWEEN 23 TO 33% MOISTURE, B. ENERGETICALLY MIXING SAID HEATING THE MIXTURE TO TEMPERATURES BETWEEN 120* AND 230*F. UNTIL IT GRANULATES, BECOMES FLOWABLE AND THE MOISTURE CONTENT IS BETWEEN 20 AND 27, C. CHARGING THE GRANULATED MIXTURE TO A ROTARY DRYER, AND D. CONDUCTING AIR THROUGH THE DRYER WITH AN INLET TEMPERATURE OF ABOVE 240*F AND AN OUTLET TEMPERATURE AOBVE 130*F TO DRY THE AGGLOMERATED MATERIAL TO FORM A HYDRATED, AMORPHOUS, GRANULAR ALKALI METAL SILICATE PRODUCT HAVING A MOISTURE CONTENT BETWEEN 15 AND 25%.
Claim 3
Dependent Claim
49 words
The process of claim 1 carried out in a continuous manner in which the dry agglomerated product solids removed from the process is limited to the portion of the solids added as a solution and the remaining granular material is recycled to form the particle portion of the mixture.
Claim 4
Dependent Claim
19 words
The process of claim 1 in which the hydrated alkali metal silicate feed particles contain 5 to 30% moisture.
Claim 5
Dependent Claim
23 words
The process of claim 1 in which the agglomerating liquid is alkali metal silicate solution and comprises up to 50% of the mixture.
Claim 6
Dependent Claim
38 words
The process of claim 1 in which the alkali metal silicate particles are obtained from a process from the group consisting of: a. spray drying; b. thin film drying; c. fluid bed drying; and d. double drum drying.
Claim 7
Dependent Claim
18 words
The process of claim 5 in which at least 60% of the dryer output is retained as product.
Claim 8
Dependent Claim
29 words
The process of claim 1 in which the fine particles of alkali metal silicate are obtained by spray drying and have a bulk density of above about 30 lbs/cu.ft.
Claim 9
Dependent Claim
25 words
The process of claim 1 in which the alkali metal silicate particles are recycled fines and crushed oversize granules from the process of claim 1.
Claim 10
Dependent Claim
29 words
The process of claim 1 part (a) in which the alkali metal silicate particles and/or the alkali metal solution are heated to between 120* and 230*F prior to mixing.
Claim 11
Dependent Claim
19 words
The process of claim 1 in which water is the agglomerating liquid mixed with the alkali metal silicate particles.
References Cited (Backward Citations)
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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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |