US3906140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Co-pelletizing salt mixtures
Assignee: National Research Council Canada
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Filing: 1972-07-17
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Granted: 1975-09-16
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Expires: 1992-07-17
Abstract
Abstract Salts such as calcium and sodium chlorides are co-pelletized into composite pellets by contacting larger nuclei with finer particles in the presence of a salt solution which is substantially saturated in the salt of finer particle size and at least partially saturated in the other salt (or salts). This liquid acts as a viscous binder and binds the salts together into pellets in which the finer particles tend to be layered around the coarser nuclei. If desired, migration of part of the coarse nuclei salt toward the surface can be achieved. The pellets are easily handled without dusting and are useful e.g. for ice melting and dust control on roads.
Inventors
- 👤 Charles E Capes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:51
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/28; C; C09; C09K; C09K3/00; C09K3/18; C09K3/185; C09K5/00; C09K5/02; C09K5/06; C09K5/066; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
75 words
COMPOSITE LAYERED PELLETS OF NON-UNIFORM CROSS-SECTION EACH COMPRISING A NUCLEUS INCLUDING A COARSE PARTICLE OF CALCIUM CHLORIDE, SURROUNDED BY AT LEAST ONE LAYER OF FINER PARTICLES COMPRISING SODIUM CHLORIDE, THE PARTICLES BEING BONDED TOGETHER BY SALT BRIDGES FROM A BINDER LIQUID SOLUTION OF SAID SALTS ON REMOVAL OF THE LIQUID, AND MIGRATED CALCIUM CHLORIDE HAVING FORMED INCREASED CALCIUM CHLORIDE CONTENT IN THE SURROUNDING LAYER OR LAYERS, THE CALCIUM CHLORIDE BEING PRESENT IN ABOUT 5-30% WT.
Claim 2
Dependent Claim
75 words
COMPOSITE LAYERED PELLETS OF NON-UNIFORM CROSS-SECTION EACH COMPRISING A NUCLEUS INCLUDING A COARSE PARTICLE OF CALCIUM CHLORIDE, SURROUNDED BY AT LEAST ONE LAYER OF FINER PARTICLES COMPRISING SODIUM CHLORIDE, THE PARTICLES BEING BONDED TOGETHER BY SALT BRIDGES FROM A BINDER LIQUID SOLUTION OF SAID SALTS ON REMOVAL OF THE LIQUID, AND MIGRATED CALCIUM CHLORIDE HAVING FORMED INCREASED CALCIUM CHLORIDE CONTENT IN THE SURROUNDING LAYER OR LAYERS, THE CALCIUM CHLORIDE BEING PRESENT IN ABOUT 5-30% WT.
Claim 3
Dependent Claim
21 words
The pellets of claim 1 containing hydrates of CaCl2 formed from aqueous binder liquid and CaCl2 on standing at ambient temperature.
Claim 4
Dependent Claim
11 words
The pellets of claim 1 containing about 30-40% internal void space.
Claim 5
Independent Claim
141 words
A method of forming non-uniform cross-section composite layered pellets containing calcium chloride and sodium chloride comprising: a. providing as pellet nuclei coarse particles of calcium chloride in amounts from about 5-30% wt., b. contacting the nuclei particles with fine particles comprising sodium chloride, c. dispersing an aqueous binder liquid among the particles, the amount of binder liquid being of the order of 10-35% wt. based on dried pellet, the liquid being substantially saturated with sodium chloride and at least 40% saturated but not completely saturated with calcium chloride, d. balling the mixture with a tumbling action causing the fine particles to layer on the coarse calcium chloride, e. evaporating the aqueous liquid causing migration of some nuclei calcium chloride into surrounding layers and deposition of salt bonds, and f. recovering composite layered pellets having calcium chloride deposited among the sodium chloride.
Claim 6
Independent Claim
141 words
A method of forming non-uniform cross-section composite layered pellets containing calcium chloride and sodium chloride comprising: a. providing as pellet nuclei coarse particles of calcium chloride in amounts from about 5-30% wt., b. contacting the nuclei particles with fine particles comprising sodium chloride, c. dispersing an aqueous binder liquid among the particles, the amount of binder liquid being of the order of 10-35% wt. based on dried pellet, the liquid being substantially saturated with sodium chloride and at least 40% saturated but not completely saturated with calcium chloride, d. balling the mixture with a tumbling action causing the fine particles to layer on the coarse calcium chloride, e. evaporating the aqueous liquid causing migration of some nuclei calcium chloride into surrounding layers and deposition of salt bonds, and f. recovering composite layered pellets having calcium chloride deposited among the sodium chloride.
Claim 7
Dependent Claim
18 words
The method of claim 4 wherein the fine particles are added in stages with successive layers being formed.
Claim 8
Dependent Claim
33 words
The method of claim 4, wherein the coarse salt is CaCl2 flakes from the CaCl2 recovery circuit of a Solvay process plant and the finer salt is NaCl byproduct from the same circuit.
Claim 9
Dependent Claim
24 words
The method of claim 4 wherein the binder liquid is a salt settler underflow from the CaCl2 recovery circuit of a Solvay process plant.
Claim 10
Dependent Claim
18 words
The method of claim 4, wherein the binder liquid contains about 20 to about 45% by wt. CaCl2.
Claim 11
Dependent Claim
23 words
The method of claim 4, wherein the following operation is carried out in a blanketing liquid which is immiscible with the binder liquid.
Claim 12
Dependent Claim
24 words
The method of claim 4 wherein the coarse calcium chloride is about 1-4 mm. diameter and the finer sodium chloride about 0.1-0.3 mm. diameter.
Claim 13
Dependent Claim
25 words
The method of claim 4 wherein the diameter of the coarse calcium chloride is of the ordEr of 10 times that of the sodium chloride.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |