JOURNAL 



O F 



NATURAL PHILOSOPHY, CHEMISTRY, 



AND 



THE ARTS. 



JULY 1800. 



ARTICLE r. 



De/cription of a new Method of extraSing Silver from Copper-Mat by means of Lead, by 

 which the Eliquation of Black-Copper is rendered unneceffary. By the late Dr. G res* j 

 Prof, at Halle in Saxony. 







Nc 



1 OTWITHSTANDING the confiderable progrefs which the metallurgical part of 

 fcientific chemiftry has made in modern times, it muftbe allowed, that its influence on the 

 manipulations in the fmelting works has hitherto been but of little importance, and that 

 jnany of thefe operations are carried on by the procefiis ufed feveral centuries ago ; with all 

 the errors which have been difcovered by fubfequent improvements in chemical knowledge. 

 The introduQion of the prefent procefs of eliquation, was indeed a material and great improve- 

 ment on the former method of feparating filver from copper, by which the copper-mat f 

 was combined with lead, and the mafs afterwards fubjefted to gradual heat- For in this 



* Tranflated from Dr. Scherer's, fucceflbr to Gren in the profefforfliip at Halle, CeneralChemieal Journal, 

 Vol. IV. page 155. 



t Copptr-mat (Kupfer-rohftein) is the produft obtained from pyritous copper-ores, having undergone 

 the firft or crude fufion, by which the ftony matrix only has been fcparated.— C/-^«'s Principles of Modern 

 Chemijiry, § 1444.— Tranfl. 



Vol. IV.— July. IT method. 



