The purification process utilizes the cementation process to further purify the zinc.
2.
The raw material for this was blister steel, made by the cementation process.
3.
New methods of producing it by carburizing bars of iron in the cementation process were devised in the 17th century.
4.
However, during this period a vast and highly important technological innovation happened using the cementation process, the production of steel.
5.
Coarse grained stone was used for furnace lining and from these were hewn the stone boxes used in the Cementation process of steelmaking.
6.
The production of steel by the cementation process was described in a treatise published in Prague in 1574 and was in use in Nuremberg from 1601.
7.
The cementation process, which was lost from the end of the Roman to the early Medieval period, continued in the same way with brass.
8.
Apart from some production of puddled steel, English steel continued to be made by the cementation process, sometimes followed by remelting to produce crucible steel.
9.
The pinkish-purple discolouration of the vessels showed them to have been used with the salt cementation process which removes iron from the clay as ferric chloride.
10.
Theophilus was a 12th-century German monk and in his book " De Diversus Artibus " gives the clearest description of the salt cementation process.
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