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 Title: |
US4320098:
Aluminum sulfate manufacture from aluminum dross tailings
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Huckabay, Durward A.; Reno, NV
Skiathas, Arthur D.; El Sobrante, CA
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| Assignee: |
Imperial West Chemical Company, Reno, NV
other patents from IMPERIAL WEST CHEMICAL COMPANY (268420) (approx. 4)
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| Published / Filed: |
1982-03-16
/ 1980-12-30
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| Application Number: |
US1980000221380
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| IPC Code: |
Advanced:
C01F 7/74;
C22B 21/00;
Core:
C01F 7/00;
more...
IPC-7:
C01F 7/74;
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| ECLA Code: |
C01F7/74B; C22B21/00B; M01P4/61;
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| U.S. Class: |
Current:
423/132;
423/111;
423/128;
423/556;
Original:
423/132;
423/111;
423/128;
423/556;
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| Field of Search: |
423/111,114,128,132,556
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| Priority Number: |
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| Abstract: |
There is disclosed a method for the elimination of the chief impurities in aluminum dross tailings. The method can be used as a pretreatment in the manufacture of aluminum sulfate from aluminum dross tailings in a continuous flow reaction zone in which the dross tailings prior to reaction with sulfuric acid are pretreated to reduce the more objectionable contaminants contained therein to acceptable levels. The most objectionable contaminant in the dross tailings is aluminum metal which, in the invention, is oxidized with water or steam at elevated temperatures. The dross tailings, which are chiefly particles of aluminum oxide, are suspended in an aqueous slurry and the slurry is heated to a temperature from 185 DEG -225 DEG F. and maintained under liquification pressures and sufficient agitation to insure particle-to-particle attrition that removes an aluminum hydroxide coating which would otherwise inhibit the reaction.
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| Attorney, Agent or Firm: |
Fischer, Tachner & Strauss ;
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| Primary / Asst. Examiners: |
Carter, Herbert T.;
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Parent Case: |
This application is a continuation of Ser. No. 24,914 filed Mar. 29, 1979, now U.S. Pat. No. 4,252,776.
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| Family: |
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First Claim:
Show all 16 claims |
What is claimed is:
1. A method for the manufacture of aluminum sulfate from the reactants comprising sulfuric acid and aluminum dross tailings comprising a mixture of water soluble salts, aluminum oxides and aluminum metal particles which comprises treatment of aluminum dross tailings by:
- (a) washing said aluminum dross tailings with water to remove water soluble salts and form an aqueous slurry of aluminum oxides and aluminum metal particles containing no more than about 1 weight percent soluble salts;
- (b) heating said slurry to a temperature from 185 to about 225 degrees F. and agitating said slurry to cause sufficient particle-to-particle attrition to remove the aluminum hydroxide protective film on the aluminum metal particles to reduce the metallic aluminum content of said slurry to less than about 0.5 weight percent and thereby produce treated dross tailings, and thereafter reacting the treated dross tailings with sulfuric acid having a concentration from 30 to 99.4 weight percent at a temperature from 225 degrees to 360 degrees F. and at sufficient pressure at said temperature to maintain said reactants in liquid phase, for a time from 5 to 45 minutes, and recovering aluminum sulfate from the resulting reaction product.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
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