Analytical Methods for Certain Metals Including Cerium, Thorium, Molybdenum, Tungsten, Radium, Uranium, Vanadium, Titanium and Zirconium, Issues 209-212 |
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acetic acid acid solution acidified added alkaline alloys ammonia ammonium analysis aqua regia beaker boiling c. c. of concentrated c. c. of HCl c. c. of water carbonate carnotite cent ceric cerium Chem chloride chromium cinchonine cipitate color cooled crucible decomposed decomposition determination dissolved in HCl electroscope elements emanation evaporated to dryness excess ferric filter paper filtrate flask fumes fused fusion gram Mo H₂O H₂O₂ H₂SO heated hot water hydroxide ignited insoluble iodate iron Jahrg Jour KMnO lead acetate metals mineral mixture molybdate molybdenum monazite Na,CO NaOH neutral solution NH OH NH,OH nitric acid oxalic acid oxide permanganate phosphate potassium precipitate present procedure quantity radium rare earths reduced removed residue salts sample separation silica sodium soluble solution containing steel sulphate sulphide sulphuric acid thiosulphate thorium tion titanium titrated treated tungsten tungstic acid uranate uranium V₂O vanadate vanadium volumetric method washed weighed zirconium Ztschr
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Page 313 - A little water with a few drops of hydrofluoric acid is added and the insoluble rare-earth fluorides (crude) collected on a small filter held by a perforated platinum or rubber cone and washed with water acidified with the same acid. The precipitate is washed into a small platinum dish and evaporated to dryness with sulphuric acid, the paper being burned and added before expulsion of the acid. The sulphates are dissolved in dilute, hydrochloric, acid, the...
Page ii - Mines, in carrying out one of the provisions of its organic act— to disseminate information concerning investigations made — prints a limited free edition of each of its publications. When this edition is exhausted, copies may be obtained at cost price only through the Superintendent of Documents, Government Printing Office, Washington, DC The Superintendent of Documents is not an official of the Bureau of Mines.
Page 223 - ORES. Treat from 2 to 5 grams of ore, according to the proportion of vanadium, iron, and uranium present, in a covered beaker, with 10 cc of HC1 and let it stand 15 minutes, shaking it occasionally. Add 5 cc of HNO3 and heat on a steam bath.
Page 126 - Rapid Methods for the Chemical Analysis of Special Steels, Steel-Making Alloys and Graphite...
Page 122 - After allowing it to cool somewhat, 5 cc. of nitric acid (sp.gr. 1.42) are added and the evaporation is repeated. The evaporation with 5 cc. portions of strong nitric acid is repeated several times until the filter paper has been completely destroyed and every trace of yellow color, due to carbonaceous matter, has disappeared. When this has been accomplished the solution is fumed strongly for a short while, cooled, 5 cc. of water are added and the liquid is again taken to funifc of sulphur trioxide...
Page 223 - HNOS for each 100 cc of liquid. Now add 10 cc of a 20 per cent lead acetate solution, and enough of a strong solution of ammonium acetate to neutralize the nitric acid present and substitute acetic acid for it. The object is to precipitate the vanadium as lead vanadate in an acetic acid solution. The ammonium acetate solution may be made by mixing 80 cc of strong ammonia, 100 cc of water, and 70 cc of acetic acid 99 per cent pure.
Page 237 - quisqueite." It is a black carbonaceous substance containing sulphur, with a hardness of 2.5 and a specific gravity of 1.75. There is also a lesser quantity of a cokelike material with a hardness of 4.5 and a specific gravity of 2.2. Neither of these contain vanadium. The vanadium is mostly at the southern end of the ore body, and to a depth of 20 feet is largely in the form of red calcium vanadate.
Page 238 - Chrome-vanadium steels and chrome-vanadium^molybdenum steels are the latest development in structural alloy steels that have gained an extensive market. Almost all these steels are made in the openhearth furnace, chromium and vanadium alloys being added shortly before casting. In their physical properties these steels are much like chrome-nickel steels, but they have a greater constriction of area for a given limit.
Page 223 - HCl and 2 cc of water and stir with a glass rod until any red crust is dissolved, then dilute the solution with water and filter it into the main liquid. Pass H2S into the liquid to separate copper, lead, and other metals of this group, filter and boil the liquid to expel the H2S. Concentrate the liquid to 100 cc if necessary, oxidize it with an excess of H2O2, and then neutralize with dry Na2CO2, adding 2 or 3 grams in excess.
Page 135 - But on addition of 1 cc of nitric acid (1.20 sp. gr.) to such a solution the black entirely disappears if due to the presence of the two last named elements. The black precipitate, if caused by a small quantity of tungsten, on addition of the nitric acid, changes to a yellow. If the amount of the latter is small, it is better to put the test tube back on the water bath and permit the tungstic acid to settle for two hours, when it can be seen plainly as a yellow spiral thread rising up thru the solution...