| Description |
v, 41 leaves : illustrations ; 28 cm |
| Summary |
"The alumina content of the diaspore clay is the index to its refractoriness, so it is important to know the alumina content of the diaspore clay. Diaspore is mined in comparatively small pits and naturally the alumina content will vary from pit to pit and will vary to a considerable extent in the same pit. Since a uniform finished product is desired, the alumina content of each pit must be known and frequent checks run on the output of the pits. Chemical analysis is the standard method of determining the amount of alumina in clays. The main objections to chemical analysis is the length of time involved in the determination and the lack of information concerning the mineral form of the alumina in the sample. Petrography, X-Ray, and the differential thermal furnace are some methods that have been suggested to overcome the deficiencies of chemical analysis. It is the purpose of this work to discuss these methods and to compare them"--Introduction, leaf v. |
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