File:Man working with precipitator in pilot plant.jpg
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Summary edit
| Description |
English: Photograph of lower portion of the precipitator used in the pilot plant at the National Bureau of Standards for the extraction of alumina from clay. The solution obtained from digestion of the clay in hydrochloric acid, with insoluble silica removed, enters a large tank (lower center). The contents of the tank are pumped to the top of a nine-foot tower, the base of which is shown above the tank, and then allowed to fall against a stream of hydrochloric acid gas entering at the bottom of the tower, with resultant precipitation of aluminum as hydrated aluminum chloride. |
| Date | |
| Source | National Institute of Standards and Technology |
| Author | National Institute of Standards and Technology |
The images in the Aluminum from Clay Photographic Collection are in the public domain and are not subject to copyright in the United States. However, please pay special attention to the individual works to make sure there are no copyright restrictions indicated. Individual works may require securing other permissions from the original copyright holder. Use of the images from NIST Digital Collections is not restricted, but a statement of attribution is required. Please use the following attribution statement: ""National Institute of Standards and Technology Digital Collections, Gaithersburg, MD 20899.""
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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.
Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | ||
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 12:33, 12 August 2013 | | 4,761 × 6,057 (1.45 MB) | Katelynd.bucher (talk | contribs) | User created page with UploadWizard |
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