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Updated: May 27, 2025
A sacrifice of fruits was offered by the pontiffs in the presence of ten witnesses; the contracting parties were seated on the same sheepskin; they tasted a salt-cake of far or rice; and this confarreation, which denoted the ancient food of Italy, served as an emblem of their mystic union of mind and body.
It will have been noticed that one of the chief reagents in the Leblanc process is the sulphur used in the form of brimstone or as pyrites for making vitriol in the first stage; this sulphur goes through the entire process; from the vitriol it goes to form a constituent of the salt-cake, and afterwards of the calcium sulphide contained in the black ash.
A large covered iron pan, called the decomposing pan or salt-cake pot, is mounted in one part of the salt-cake furnace, and alongside it is the hearth or bed on which the second stage of the process, the drying or roasting, is effected. The mixture of common salt and vitriol is charged into the salt-cake pot, which is heated by a fire below.
Now, it is the principal product; indeed, the Leblanc alkali maker may be said to subsist on that hydrochloric acid, as his chief instrument for producing chloride of lime or bleaching powder. Mechanical furnaces are now used to a large extent for the salt-cake process.
Alkali: Leblanc Process. The manufacture of vitriol, as I have described it to you, is the first step in the Leblanc process. The production of salt-cake or crude sodium sulphate is carried out in two stages.
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