Platform
Spodium (also bone ash or leg ash ) is a salt mixture obtained from animal bones. The main component is calcium phosphate .
Manufacturing
Spodium is made from animal bones or ivory, whereby the organic substance contained in the bones is completely burned when air is supplied and only the mineral components of the bones remain. Spodium consists of 73-84% calcium phosphate , 9.4-10% calcium carbonate , 2-3% magnesium phosphate and 4% calcium fluoride and is ground to a white powder.
When animal bones char in the absence of air , bone char is formed .
In the Middle Ages, the ivory spodium, considered to be of high quality, was adulterated by preparations made using dog bones or marble .
Spodium was obtained on a large scale in South America, where the bones of the slaughtered cattle were used as fuel. The remaining Spodium was shipped to Europe.
use
Spodium was used to make milk glass , white glazes, polishing and cleaning agents, and fertilizers. In some cases it was also processed into phosphoric acid , phosphorus and superphosphates .
Today, bone ash is used in aluminum foundries as a separating agent to protect transport channels. This takes advantage of the fact that bone ash cannot be wetted by liquid metals. Bone ash is also used in the production of high-quality ceramics, so-called fine bone china .
Since the Middle Ages, Spodium has been prescribed for diarrhea and blood flow.
Individual evidence
- ↑ a b bones ( memento of the original from January 2, 2015 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. . In: Adolf Beythien, Ernst Dressler (Ed.): Merck's Lexicon of Goods for Trade, Industry and Commerce. 7th edition. Gloeckner, Leipzig 1920. (Reprint: Manuscriptum, Recklinghausen 1996. ISBN 3-933497-13-2 )
- ↑ Konrad Goehl : Observations and additions to the 'Circa instans'. In: Medical historical messages. Journal for the history of science and specialist prose research. Volume 34, 2015 (2016), pp. 69-77, here: p. 70.
- ↑ Constantine the African : De gradibus quos vocant simplicium liber. In: Constantini Africani post Hippocratem et Galenum, quorum - Graece linguae doctus - sedulus fuit lector, medicorum nulli prorsus, multis doctissimis testibus, posthabendi opera [...]. Basel (Henricus Petrus ) 1536, pp. 342–387, here: p. 370.
