Journal . en it is separated inany convenient manner. Instead of diluting with water,the action of sulphuretted hydrogen may be continueduntil as much zinc as can be is precipitated ; the pre-cipitate is then separated, the liltrate neutralised, andagain subjected to the action of the gas, this process beingrepeated until all the zinc obtainable is zinc sulphide is washed with a little acid until allthe foreign salts are removed, when the washing is com-pleted with water.—S. H. Improvements in Apparatus employed in the Ammonia Soda Process. 0. Iniray. From La Socicte Anonymepo
Journal . en it is separated inany convenient manner. Instead of diluting with water,the action of sulphuretted hydrogen may be continueduntil as much zinc as can be is precipitated ; the pre-cipitate is then separated, the liltrate neutralised, andagain subjected to the action of the gas, this process beingrepeated until all the zinc obtainable is zinc sulphide is washed with a little acid until allthe foreign salts are removed, when the washing is com-pleted with water.—S. H. Improvements in Apparatus employed in the Ammonia Soda Process. 0. Iniray. From La Socicte Anonymepour lEtude et la Creation de Soudieres, Paris,France. Fug. Pat. 93G6, July 19, 1886. 8d. THE first operation in the ammonia-soda process is thetreatment of ammoniacal brine with carbonic acid. Thecarbonatiug apparatus according to this invention isshown in Fig. 1. It consists of an annular cylinder,having within the annulus numerous shelves p serratedat their edges, which project from the sides and nearly. be passed through their walls, and by this means thecylinders can be made of a large diameter. A specialfeature of the process is the complete conversion of thehydrochloric acid into chlorine. Impure hydrochloricacid, which is unlit to be employed directly in the Deaconprocess, is quite suitable for this process.—S. H. Improvements in obtaining Sulphide of Zinc from Solu-tions. .1. II. Dennis, Liverpool; andN. Glendinning,St. Helens. Eng. Pat 8217, June 22, 1886. fid. IT is intended to obtain pure zinc sulphide from the solu-tions which arc produced iii the manufacture of copperi,\ thewel process, and other metallurgical the solution contains any metal which in the presenceof free acid is precipitated b\ sulphuretted hydrogen,the solution is treated with this gas until these metalsare precipitated, and the said gas is slightly in free acid is then nearly neutralised by passing thesol ui ion through a filter-bed of limestone. The neutralisedsolution
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
