File:AluminumFromClay 006.jpg

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Preliminary roasting at a moderate temperature is the first step in the hydrochloric acid process developed at the National Bureau of Standards for the production of aluminum from clay. The powdered clay is stirred by rabble arms (visible within the furnace door) as it passes downward in the triple-hearth Wedge furnace. Roasting increases the solubility of the alumina content so that it may be dissolved out with dilute hydrochloric acid and thus separated from the silicon, which remains as silica, insoluble in acid.

Date

5/1/1947

Source

National Institute of Standards and Technology

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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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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.

English ∙ 日本語 ∙ македонски ∙ Nederlands ∙ +/−

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	19:02, 6 March 2014		4,776 × 6,027 (2.05 MB)	NISTResearchLibrary (talk \| contribs)

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Image title	Preliminary roasting at a moderate temperature is the first step in the hydrochloric acid process developed at the National Bureau of Standards for the production of aluminum from clay. The powdered clay is stirred by rabble arms (visible within the furnace door) as it passes downward in the triple-hearth Wedge furnace. Roasting increases the solubility of the alumina content so that it may be dissolved out with dilute hydrochloric acid and thus separated from the silicon, which remains as silica, insoluble in acid.
Author	National Institute of Standards and Technology
Copyright holder	This is the copyright info.
Credit/Provider	National Institute of Standards and Technology
Source	Aluminum from Clay Photograph Collection
Short title	Preliminary roasting in hydrochloric acid process
Date and time of data generation	1 May 1947
Width	4,776 px
Height	6,027 px
Bits per component	8 8 8
Compression scheme	Uncompressed
Pixel composition	RGB
Orientation	Normal
Number of components	3
Horizontal resolution	600 dpi
Vertical resolution	600 dpi
Data arrangement	chunky format
Software used	Adobe Photoshop CS5 Windows
File change date and time	15:54, 12 February 2013
Exif version	2.21
Color space	Uncalibrated
Image width	4,776 px
Image height	6,027 px
Original transmission location code	16233-1
Copyright status	Copyright status not set
Date metadata was last modified	11:00, 12 February 2013
Date and time of digitizing	02:41, 29 January 2013
Unique ID of original document	xmp.did:913A136B5675E21197A3CF50644ABE3E
Keywords	Aluminum oxide--Research--Photograph collections. Clay--Research--Photograph collections.
Contact information	library@nist.gov 100 Bureau Dr, MS 2500 Gaithersburg, MD, 20899 301-975-3052
IIM version	2

File:AluminumFromClay 006.jpg

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