US3986975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for continuous production of flocculating agent from red mud
Assignee: BK Giulini Chemie GmbH
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Filing: 1973-08-22
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Granted: 1976-10-19
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Expires: 1993-08-22
Abstract
Abstract Red mud from the production of alumina from bauxite by the Bayer process is converted to a flocculating agent by reaction with sulfuric acid and drying the reaction product by direct heat transfer thereto by contact with hot solid bodies and by contact with hot gases. The resulting solid product is a mixture of water-soluble sulfates of iron and aluminum with minor proportions of other water-soluble metal sulfates in the form of free-flowing discrete particles.
Inventors
- 👤 Gerhard Bayer
- 👤 Egon Cherdron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:26
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
57 words
A continuous process for producing freeflowing, particulate flocculating agents from red mud comprising reacting red mud of any desired water content with aqueous sulfuric acid having a strength above 60% and passing the reaction mass with agitation in contact with hot solid bodies and a current of hot gases to simultaneously dry and comminute the reaction mass.
Claim 2
Dependent Claim
57 words
A continuous process for producing freeflowing, particulate flocculating agents from red mud comprising reacting red mud of any desired water content with aqueous sulfuric acid having a strength above 60% and passing the reaction mass with agitation in contact with hot solid bodies and a current of hot gases to simultaneously dry and comminute the reaction mass.
Claim 3
Dependent Claim
29 words
A process as set forth in claim 1 wherein the amount of sulfuric acid is selected so that the pH of the reaction mass lies between 1.5 and 2.5.
Claim 4
Dependent Claim
36 words
A process as set forth in claim 1 wherein the reaction of the red mud with the sulfuric acid, is substantially completed before the reaction mass is contacted with the heated solid bodies and hot gases.
Claim 5
Dependent Claim
14 words
A process as set forth in claim 1 wherein the acid strength is 80-96%.
Claim 6
Dependent Claim
20 words
A process as set forth in claim 2 wherein the pH of the reaction mass is between 1.8 and 2.1.
Claim 7
Dependent Claim
21 words
A process as set forth in claim 1, wherein the reaction mass is dried and comminuted in a rotary drum kiln.
Claim 8
Dependent Claim
84 words
A continuous process for producing free-flowing, particulate flocculating agents from red mud comprising: reacting red mud as received from the Bayer process for the producton of alumina and having a water content of from 35 to 50% with aqueous sulfuric acid having a strength above 60% to from a reaction mass; and passing the reaction mass with agitation in contact with hot solid bodies and a current of hot gases to simultaneously dry and comminute the reaction mass and form free-flowing, particulate flocculating agents.
Claim 9
Dependent Claim
84 words
A continuous process for producing free-flowing, particulate flocculating agents from red mud comprising: reacting red mud as received from the Bayer process for the producton of alumina and having a water content of from 35 to 50% with aqueous sulfuric acid having a strength above 60% to from a reaction mass; and passing the reaction mass with agitation in contact with hot solid bodies and a current of hot gases to simultaneously dry and comminute the reaction mass and form free-flowing, particulate flocculating agents.
Claim 10
Dependent Claim
29 words
A process as set forth in claim 7, wherein the amount of sulfuric acid is selected so that the pH of the reaction mass lies between 1.5 and 2.5.
Claim 11
Dependent Claim
36 words
A process as set forth in claim 7, wherein the reaction of the red mud with the sulfuric acid is substantially completed before the reaction mass is contacted with the heated solid bodies and hot gases.
Claim 12
Dependent Claim
14 words
A process as set forth in claim 7, wherein the acid strength is 80-96%.
Claim 13
Dependent Claim
20 words
A process as set forth in claim 8, wherein the pH of the reaction mass is between 1.8 and 2.1.
Claim 14
Dependent Claim
21 words
A process as set forth in claim 7, wherein the reaction mass is dried and comminuted in a rotary drum kiln.
References Cited (Backward Citations)
US1197123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |