[PT032AAG1], Technical Note, Thomas Alva Edison, July 27th, 1887
https://edisondigital.rutgers.edu/document/PT032AAG1
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Title
[PT032AAG1], Technical Note, Thomas Alva Edison, July 27th, 1887
Editor's Notes
Dick-- Patent. The object of this invention is to prepare pyritious ores for seperation of their magnetic constituents from the other matter by my system of magnetic seperation shewn in patent _____ This being a link in the process of extracting gold from pyritious gangue; If have found that Bisulphide of iron or common iron pyrites is a very frequent gangue of gold ores and this is very slightly magnetic so that the most powerful magnets are required to alter the trajectory of the powdered material when falling. I have found that if the powdered pyrites be placed in a closed chamber and heated to a dull read heat the Bisulphide is reduced to protosulphide or fior and this increases its magnetism sufficiently to premit the use of less powerful magnets for its seperation. But if the operation of heating [following this is a complete draft in someone else's hand - see how this relates to Dickson's work up to this point]
Author
Mentioned
Date
1887-07-27
Type
Folder/Volume ID
PT032AAG-F
Microfilm ID
114:101
Document ID
PT032AAG1
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University