The Assayer's Manual: An Abridged Treatise on the Docimastic Examination of Ores, and Furnace and Other Artificial Products |
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Page xi
... Loss of Gold in Cupelling . 175 Action of Platinum , Rhodium , and Iridium 176 Palladium ; Pulverulent Assay of Auriferous Silver 177 Different Modes of Determining the Gold ; Separation of Aurif- erous Silver Grains from Samples of ...
... Loss of Gold in Cupelling . 175 Action of Platinum , Rhodium , and Iridium 176 Palladium ; Pulverulent Assay of Auriferous Silver 177 Different Modes of Determining the Gold ; Separation of Aurif- erous Silver Grains from Samples of ...
Page 27
... loss of dust , either in a covered mortar , or on a flat disk of cast iron . 3. Sifting . - Brass wire sieves are generally used in preference to hair sieves . For less valuable ores the sieves have from 14 to 20 meshes to the square ...
... loss of dust , either in a covered mortar , or on a flat disk of cast iron . 3. Sifting . - Brass wire sieves are generally used in preference to hair sieves . For less valuable ores the sieves have from 14 to 20 meshes to the square ...
Page 36
... loss of metal ( for instance , of silver and gold ) the temperature must not be raised higher than is absolutely necessary . The loss from this cause is greatest with ores containing antimony , arsenic , zinc , etc. 3. Fusion . The ...
... loss of metal ( for instance , of silver and gold ) the temperature must not be raised higher than is absolutely necessary . The loss from this cause is greatest with ores containing antimony , arsenic , zinc , etc. 3. Fusion . The ...
Page 69
... loss of silver . If , on the other hand , they are too porous , they absorb too much silver and gold with the lead ox- ides . ( A loss of metal can never be entirely avoided in the assay . ) D. Vessels of other materials . — Cupels in ...
... loss of silver . If , on the other hand , they are too porous , they absorb too much silver and gold with the lead ox- ides . ( A loss of metal can never be entirely avoided in the assay . ) D. Vessels of other materials . — Cupels in ...
Page 85
... loss of lead may be 5 per cent . greater . The results are sometimes calculated to whole per cents . , but more frequently from 5 to 5 per cent . The condition of the ore , whether the lead is sulphu- rized or oxidized , and whether the ...
... loss of lead may be 5 per cent . greater . The results are sometimes calculated to whole per cents . , but more frequently from 5 to 5 per cent . The condition of the ore , whether the lead is sulphu- rized or oxidized , and whether the ...
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Common terms and phrases
2.5 grammes 20 grammes added alloy ammonia ammonium antimony aqua regia argol arsenic assay sample beaker-glass bismuth black copper black flux boiled borax burette cent charcoal charge chloride coal cobalt color common salt containing copper covering of common crucible crucible Fig cubic centimeters cubic inches cupelled decanted decomposed determined diluted Dingler dried evaporated to dryness ferric oxide ferrous filtered filtrate flask fluid foreign metals Fresenius furnace fused fusion glass gold gramme 15.43 grains gramme 7.71 grains grammes 154.32 grains grammes 77.16 grains granulated lead heated hydrate hydrochloric acid ignited iron lead button liquid litharge mercury metallic sulphides meters method millimeters mixed mixture muffle muffle-furnace nickel nitric acid percentage placed platinum porcelain potassium carbonate potassium cyanide poured powdered precipitated pyrites refractory residue scorifier slag smelting sodium carbonate sodium sulphide substances sulphate sulphuretted hydrogen sulphuric acid temperature titrated tube u. h. Ztg volumetric washed weighed zinc Ztschr
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