Five thousand receipts in all the useful and domestic arts / [Colin Mackenzie].

  • Colin Mackenzie
Date:
1823
Catalogue details

Licence: Public Domain Mark

Credit: Five thousand receipts in all the useful and domestic arts / [Colin Mackenzie]. Source: Wellcome Collection.

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    quickly as possible ; and when well done, take out the crucible, and let it cool gradually. The re- gulus will be found at the bottom. In the humid way. Bismuth is easily soluble in nitrous acid or aqua regia. Its solution is colourless, and is precipitable by the addition of pure water; 118 grains of the precipitate from nitrous acid, well washed and dried, are equal to 400 of bismuth _ in its metallic form. ANTIMONIAL ORES. Take a common crucible, bore a number of small holes in the bottom, and place it in ano- ther crucible a. size smaller, luting’ them well together ; then put the proper quantity of ore in small Jumps into the upper crucible, and lute thereon a cover; place these vessels on a hearth, and surround them with stones about six inches be filied with ashes, so that the undermost cru- cible may be covered with then:; but upon the upper, charcoal must be laid, and the whole made red hot by the assistance of hand bellows. ‘The autimony being of easy fusion is separated, and runs through the holes of the upper vessel into the inferior one, where it is collected. HUMID ASSAY OF ARSENIATED ANTIMONY. Dissolve the ore in aqua regia, both the regulus and arsenic remain in the solution, the sulphur is separated by filtration. If the solution be acid, the regulus of antimony will be precipitated, and the arsenic converted into an acid, which may be obtained by evaporation to dryness. ' MANGANESE ORE. The regulus is obtained by mixing the calx or ore of manganese with pitch, making it into a ball, and putting it into a crucible, lined with pow- dered charcoal, 1-10th of an inch on the sides, and % of an inch at bottom, then filling the empty 9 space with charcoal dust, covering the cruciblewith another inverted and luted on, and exposing it to the strongest heat of a forge for an hour or more, In the humid way. The ores should be first well roasted to dephlo- gisticate the calx of manganese and iron, if any, and then treated with nitrous acid to dissolve the eartis. The residunm should now be treat- ed with nitrous acid and sugar, by which means a colourless solution of manganese will be ob- tained, and likewise of the iron, if any. Pre- cipitate with the Prussian alkali, and digest the precipitate in pure water; the prussiate of man- ganese will be dissolved, whilst the prussiate of iron will remain undissolved. ARSENICAL ORES. This assay is made by sublimation in close vessels, Beat the ore into smail pieces, and put them into a matrass, which place in a sand pot, with a proper degree of heat: the arsenic sub- limes in this operation, and adheres to the upper part of the vessel; when it must be carefully collected with a view to ascertain its weight. Sometimes a single sublimation will not be suffi- cient, for the arsenic in many cases will melt with the ore, and prevent its total volatilization ; in which case, it is better to perform the first bruise the remainder again, and expose it to a stronger heat. In the humid way. Digest the ore in marine acid, adding the ni- trous by degrees to help the solution. The sul- phur will be found on the filter; the arsenic will remain in the solution, and may be precipitated in its metallic form by zinc, adding spirit of wine to the solution. NICKEL ORE. The ores must be well roasted to expel the sulphur and arsenic; the greener the calx proves BS
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