Patent US1372808A successfully refreshed from Google Patents.
Patent US4492628A successfully refreshed from Google Patents.
US4492628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating clay to improve its whiteness
Assignee: BASF Catalysts LLC
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Filing: 1982-08-25
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Granted: 1985-01-08
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Expires: 2002-08-25
Abstract
Abstract A method of treating a clay to remove therefrom titanium mineral impurities comprising the steps of mixing an aqueous slurry of said clay having a high solids content with an activator and a collector for the titanium mineral impurities; conditioning the aqueous clay slurry at said high solids content for a time sufficient to dissipate therein at least 25 horsepower hours of energy per ton of solids; adding to the conditioned aqueous clay slurry a polyacrylate salt deflocculant; subjecting the conditioned aqueous clay slurry undiluted containing the polyacrylate salt deflocculant to a froth flotation process and removing the titanium impurities with the froth; and recovering clay having a reduced titanium minerals impurities content.
Inventors
- 👤 Raymond H. Young
- 👤 Horton H. Morris
- 👤 Robert L. Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:09
CPC Classifications
B; B28; B28C; B28C1/00; B28C1/02; B28C1/06; B28C1/08; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/016; B03D1/02; B03D3/00; B03D3/06; B03D2201/00; B03D2201/005; Y; Y02; Y02P; Y02P40/00; Y02P40/60
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
188 words
A method of treating clay to remove therefrom titanium mineral impurities, said method comprising the steps of: (a) mixing said clay in the form of an aqueous slurry having a solids content of clay and said impurities of at least 20% by weight with a collector for the titanium mineral impurities, and an activator for the titanium mineral impurities comprising a water-soluble salt of a metal chosen from the alkaline earth metals and the heavy metals; (b) conditioning the aqueous clay slurry at a solids content of at least 20% by weight for a time sufficient to dissipate therein at least 25 horsepower hours of energy per ton of solids at a pH below 7; (c) mixing a polyacrylate salt deflocculant with the resulting conditioned aqueous clay slurry after conditioning; (d) subjecting the resulting mixture of conditioned aqueous slurry having a solids content of at least 20 wt. % and the polyacrylate salt deflocculant to an air flotation process by passing air bubbles upwardly through the conditioned aqueous slurry and removing titanium mineral impurities with the froth; and (e) recovering clay having a reduced titanium minerals impurities content.
Claim 2
Independent Claim
188 words
A method of treating clay to remove therefrom titanium mineral impurities, said method comprising the steps of: (a) mixing said clay in the form of an aqueous slurry having a solids content of clay and said impurities of at least 20% by weight with a collector for the titanium mineral impurities, and an activator for the titanium mineral impurities comprising a water-soluble salt of a metal chosen from the alkaline earth metals and the heavy metals; (b) conditioning the aqueous clay slurry at a solids content of at least 20% by weight for a time sufficient to dissipate therein at least 25 horsepower hours of energy per ton of solids at a pH below 7; (c) mixing a polyacrylate salt deflocculant with the resulting conditioned aqueous clay slurry after conditioning; (d) subjecting the resulting mixture of conditioned aqueous slurry having a solids content of at least 20 wt. % and the polyacrylate salt deflocculant to an air flotation process by passing air bubbles upwardly through the conditioned aqueous slurry and removing titanium mineral impurities with the froth; and (e) recovering clay having a reduced titanium minerals impurities content.
Claim 3
Dependent Claim
35 words
Method as claimed in claim 1 wherein the first stage of said flotation step (d) is carried out at an acid pH and an alkaline pH is used in succeeding stages of said flotation step.
Claim 4
Dependent Claim
36 words
Method as claimed in claim 1 wherein, prior to mixing said clay slurry with said collector and activator, said clay slurry is bleached with an oxidative bleach at a pH of about 6 to about 7.
Claim 5
Dependent Claim
13 words
Method as claimed in claim 3 wherein said oxidative bleach is potassium monopersulfate.
Claim 6
Dependent Claim
19 words
Method as claimed in claim 3 wherein the polyacrylate salt deflocculant used in step (c) is the sodium salt.
Claim 7
Dependent Claim
19 words
Method as claimed in claim 3 wherein the polyacrylate salt deflocculant used in step (c) is the lithium salt.
Claim 8
Dependent Claim
19 words
Method as claimed in claim 3 wherein the polyacrylate salt deflocculant used in step (c) is the ammonium salt.
Claim 9
Dependent Claim
39 words
Method as claimed in claim 1 wherein said conditioning step (b) is carried out in a conditioning vessel and the resulting conditioned clay slurry is transferred to a froth flotation device wherein steps (c) and (d) are carried out.
Claim 10
Dependent Claim
39 words
Method as claimed in claim 8 wherein slurry treated by the froth flotation is removed from the froth flotation device and air is bubbled into the removed slurry which then is recycled to the froth flotation of step (d).
Claim 11
Dependent Claim
19 words
Method as claimed in claim 1, wherein said polyacrylate salt deflocculant used in step (c) is the lithium salt.
Claim 12
Dependent Claim
18 words
Method as claimed in claim 10 wherein, prior to bleaching said clay slurry is dispersed with a dispersant.
Claim 13
Dependent Claim
12 words
Method as claimed in claim 11 wherein said dispersant is sodium silicate.
Claim 14
Dependent Claim
21 words
Method as claimed in claim 10 wherein said collector is oleic acid and said activator includes calcium oxide and/or calcium chloride.
Claim 15
Dependent Claim
19 words
Method as claimed in claim 10 wherein said collector is oleic acid and said activator is a ferrous compound.
Claim 16
Dependent Claim
40 words
Method as claimed in claim 10 wherein said clay contains iron mineral impurities and said activator is a ferrous salt formed in situ by adding a reducing agent in place of some or all of said activator in step (a).
Claim 17
Dependent Claim
13 words
Method as claimed in claim 15 wherein said reducing agent is sodium dithionite.
Claim 18
Dependent Claim
22 words
Method as claimed in claim 10 wherein, after said froth flotation (d), said slurry is flocculated and bleached with a reductive bleach.
Claim 19
Dependent Claim
21 words
Method as claimed in claim 17 wherein said slurry is flocculated with sulfuric acid and said reductive bleach is sodium dithionite.
Claim 20
Dependent Claim
23 words
Method as claimed in claim 17 wherein, before flocculation and reductive bleaching, said slurry is allowed to settle and is dewatered by decanting.
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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) | 1988-01-08 | 1988-07-09 | 1989-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-08 | 1992-07-09 | 1993-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-08 | 1996-07-09 | 1997-01-08 | $7700.00 | Window Closed / Lapsed |