PREPARING MURIATE OF BARYTES, 133 



XX. 



4 very advantageous Mode of preparing Muriate of Baryteshy 

 the Mutual Decompofdion of fulphurated Barytes and Muriate 

 • qf Lime. By Mr. Gokttli^g* 



R. DRIESSEN of Groningen firft obferved, that muri-DrJcflen firft 

 ate of lime and fuiphate of barytes decompofe each other at a phat^ of "barytes 

 high degree of heat. Trommfdorff verified the experiment by muriate of 

 of the learned Dutch profcflbr, and applied the principle to lilj^^^^^^^jjl^^"^*' 

 the preparation of muriate of barytes. He perceived, how- 

 ever, that the whole of the fuiphate of barytes was not de- 

 compofed in this way, and he thought, that equal parts of the 

 two falts were the fuitable proportion for decompofing them 

 as completely as poffible. Mr. Goettling has deemed the fub- 

 jc6t worth farther inquiry, the refult of which was the procefs 

 I (hall now defcribe. 



One part of native fuiphate of barytes in fine powder "is to Mr. Goetling'* 

 be mixed with half a part of muriate of lime. f This i^^i^ture ^^°j" ^j^^^J^j^j^' 

 is to be introduced into a Hefiian crucible, which is to be clofely of barytes in thi« 

 covered, and brought gradually to a red heat. The matter ^^^^ 

 mud be kept in a fiate of incandefcence a full half-hour, and 

 frequently ftirred. It is then to be poured out into an iron 

 cone, and afier being coarfely powdered, is to be thrown into 

 three parts of boiling water. The veflel being immediately 

 taken from the fire, the mixture is to be flirred occafionally 

 with a glafs fpatula, and the unditToIved matter is then to ba 

 left to fubfide. The clear liquor being decanted oflT, the refi- 

 duum is to be poured into a filter of linen of a clofe texture, 

 and the fluid lightly prelTed out. The refiduum being again 

 lixiviated with one part of water, is to be drained as before. 

 The liquors are then to be mixed together, and evaporated to 

 a pellicle, to obtain the fait by cryftallization. In this way 

 we fliall have five-eights of a part of muriate of barytes. The 



* Van Mons's Journal de Chimie, Vol. VI. p. $2, Abridged 

 from the Tafchcn-Buch juer Scheidekuenjller. 



f This muriate is obtained in abundance in our laboratories, as Muriate of lime, 

 an adventitious prod u 61 : it mny he procured likewife at a very °^ '^"^*"is*l« 

 trifling expence by adding lime to the mother-water left after refin- 

 ing common lalt, 



- mother- 



