File:AluminumFromClay 004.jpg
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| Description | The second step in the hydrochloric acid process for the production of alumina from clay as carried out in the pilot plant constructed at the National Bureau of Standards to test the process. The digester is shown, in which, after preliminary roasting, the clay is stirred with hot dilute hydrochloride acid until soluble material is dissolved. Thus the aluminum content is dissolved out as alumina, whereas the silicon remains as insoluble silica. | |||
| Date | 5/1/1947 | |||
| Source | National Institute of Standards and Technology | |||
| Author | National Institute of Standards and Technology | |||
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This image is in the public domain in the United States because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:02, 6 March 2014 | | 4,852 × 6,012 (1.75 MB) | NISTResearchLibrary (talk | contribs) |
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