The Chemical Gazette, Or, Journal of Practical Chemistry, in All Its Applications to Pharmacy, Arts, and Manufactures Volume 13 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1855 edition. Excerpt: ...of hydrochloric and nitric acids, or in dilute sulphuric acid. In the latter ease the dissolution must be expedited by electric or galvanic agency, and the operation should be carried on in vessels of platinum. The solution is then submitted to the action of a current of chlorine, and the iron impurities precipitated therefrom by boiling with carbonate of lime, care being taken not to have too great an excess of this latter substance. The nickel is then precipitated by carbonate of soda, and taken up again by hydrochloric acid, and diluted with a large quantity of water. The solution is then saturated with chlorine gas, and an excess of carbonate of baryta is added thereto. The liquor must then be left in repose in a cold state; and the nickel may either be precipitated in the metallic state by means of a galvanic current, or precipitated in the form of an oxide; which oxide may be afterwards reduced to the metallic state in the ordinary manner. When treating speiss, take of this substance 100 parts; nitre, 20 parts; and felspar, 100 parts. By this means cobalt is produced in the state of blue glass. This is to be roasted and washed, and dissolved in sulphuric acid. The remainder of the process is to be effected in the manner above described for the treatment of impure nickel. Although the proportions above given are those generally em-ployed for the production of the improved alloy, the proportion of silver may be variously increased up to the following limit, viz. silver, 30 parts; nickel, 31 parts; and copper, 49 parts; total, 110 parts. It is advantageous, first, to melt the copper and nickel in the granular state, and afterwards to introduce the silver; and the flux to be employed in this case consists of charcoal and borax, both in the...