. Discovery. Science. DISCOVERY 32:; nium Chloride, is heated with hme to regain the vahiablc ammonia so that it may be used again. Calcium Chloride, which is formed in turn, is again probabh^ heated, Professor J. M. Thomson states, to extract the valuable chlorine by a secret process. Sylvinite In Alsace, near Mulhouse, there are some interesting deposits of a mineral salt known as Sylvinite, which is mined on a large scale, now, by the French. This mineral is the source of the valuable potash-fertiliser, and contains 35 per cent, of Potassium Chloride associ- ated with rock-salt. This occurs
. Discovery. Science. DISCOVERY 32:; nium Chloride, is heated with hme to regain the vahiablc ammonia so that it may be used again. Calcium Chloride, which is formed in turn, is again probabh^ heated, Professor J. M. Thomson states, to extract the valuable chlorine by a secret process. Sylvinite In Alsace, near Mulhouse, there are some interesting deposits of a mineral salt known as Sylvinite, which is mined on a large scale, now, by the French. This mineral is the source of the valuable potash-fertiliser, and contains 35 per cent, of Potassium Chloride associ- ated with rock-salt. This occurs at a depth of 1,600 to 2,300 ft. The deposits, like those in Cheshire, form the Potassium Chloride crystallises out while the Sodium Chloride still remains in the solution as brine, which is used again to treat a fresh supply of Sylvinite. The Potassium Chloride crystals are subsequently dried. Towards the end of the war, an artificial process of extracting Potassium Chloride from the flue-dust from blast-furnaces was instituted for the manufacture of high explosives. Celestine A unique but Celestine-digging. surface at Yate. small English industr}- is that of This salt occurs in the Trias at the in Gloucestershire, and this is the. Fig. 2.âwieliczk.\ sai,t mixes, galicia. The railway station on the third level. (By courtesy of Sir Isaac Pitman &â SonSy Ltd.) an ellipse with the longer axis running north-east to south-west, that is to say that the deposits attain their maximum thickness along this line, and thin out to the north-west and south-east of it. Sylvinite exists in two beds of 3 ft. to 8 ft. thick (locally up to 17 ft.) belonging to the Tertiary period. The roof in the mines is formed of hard clay, which renders the workings watertight. The horizontal layers of the salt are coloured in most beautiful shades of red, blue, and yellow, probably due to different percentages of salts which have separated out in the old salt-lake. The concentration of the Potassium C
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