194? Mr. Everitt on oeconomical Mean$ 



limes as per chloride : the rest is decomposed into free hydro- 

 chloric acid and peroxide, which re?naijis behind. 



Tlie clear decanted or filtered liquid, generally acid and of 

 a dark colour, is to be evaporated to dryness in a porcelain 

 dish, when a mass of small bright yellow crystals will be ob- 

 tained. The heat of the sand-bath is now to be considerably 

 increased, when, by constantly stirring the mass, taking care 

 to heat the sides as well as the bottom of the dish, it soon ac- 

 quires a gray ashy aspect; and if the operation be continued 

 till hydrochloric acid gas ceases to rise (this to be ascertained 

 by holding a rod dipped in ammonia over it), we obtain, on 

 pouring water on it and filtering, a colourless liquid, contain- 

 ing all the hydrochlorate of manganese and no iron, since it 

 will be found to give a white precipitate with yellow ferro- 

 prussiate of potassa, having no blue tinge. This latter part 

 of the process may be conducted with much greater dispatch 

 by putting the dry yellow salt into an ordinary iron ladle, and 

 stirring with an iron rod over a slow fire till it becomes ash- 

 gray, or till all hydrochloric acid fumes cease to rise. The 

 heat never requires to be raised near redness so as to fuse the 

 mass ; for small quantities this part of the operation may be 

 performed in a platina crucible. 



Having a pure hydrochlorate, of course all the other salts 

 can be obtained : the carbonate by precipitation with car- 

 bonate of soda, filtering, washing, &c., and from it any salt or 

 preparation required by the scientific chemist. 



Should the manganese ore have originally contained ba- 

 rytes or lime, these must be removed from the solution before 

 precipitating the carbonate of manganese, the first by a little 

 sulphate of soda, the second by a little oxalate of ammonia : 

 this, however, does not remove the last traces of lime — (ac- 

 cording to Turner), 



Method, No. 2. — Depending on the circumstance that car- 

 bonate of manganese will precipitate peroxide of iron when 

 boiled in a solution of any peroxide salt of this metal. 



Add to the filtered solution of hydrochlorate of peroxide 

 of iron and manganese, a small quantity of carbonate of soda, 

 so as to precipitate a small portion only of peroxide of iron 

 and carbonate of manganese : now boil for five or ten mi- 

 nutes, when the carbonate of manganese will be redissolved, 

 throwing down and replacing the peroxide of iron. If, on 

 filtering a minute quantity of the solution, some iron is still 

 found to be present, by its yielding with yellow ferro-prussiate 

 of potassa a precipitate tinged with blue, a little more car- 

 bonate of soda is to be added, and the liquid boiled again : a 

 very little experience will enable the operator by this means 

 to free the solution entirely from iron, and at the same time to 



