The Lixiviation of Silver-ores with Hyposulpite Solutions: With Special Reference to the Russell Process |
Contents
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Other editions - View all
The Lixiviation of Silver-Ores with Hyposulpite Solutions: With Special ... Carl August Stetefeldt No preview available - 2014 |
The Lixiviation of Silver-Ores with Hyposulpite Solutions: With Special ... Carl August Stetefeldt No preview available - 2018 |
Common terms and phrases
AgCl alkaline amalgamation antimonate arsenical assay assay-office boiler calcium sulphide caustic lime caustic soda cent chemicals chloridizing-roasting concentration containing copper sulphate crushing cubic feet cupel cupric cuprous hyposulphite Cusihuiriachic decomposed decomposition diluted dissolved double-salts extra filter-press free acid gold heated Hence hot ordinary hours cold hydroxide hyposul inches iodine Korting ejector latter leaching lead carbonate let stand lixiviation-plant lixiviation-process lixiviation-solution lixiviation-tests lixiviation-vat metals method Na,S Ontario Mill ordinary lixiviation ordinary solution ounces silver oxide percentage phides precipitated precipitating-coefficient precipitating-tanks quantity rate of lixiviation reaction reverberatory furnace roasted Russell process Russell's salt of Lenz sample San Bartolo saturate screen Sierra Grande silver chloride silver extracted soda-ash sodium carbonate sodium hyposulphite solution sodium sulphide solu Solubility of Silver soluble Sombrerete standard extra-solution steam Stetefeldt furnace stock-solution storage-tanks sulphide solution sulphuric acid TABLE tailings tank temperature tetrathionate tion tons treated Yedras
Popular passages
Page 4 - In lixiviation pulverizing as coarse as possible is desirable. The limit of coarseness is determined by the roasting process. It depends upon the character of the ore, and, principally, upon the manner in which the silver-bearing minerals are distributed in the gangue. (2). The original cost of the lixiviation plant is much lower than that of pans and settlers. A further saving is effected by a reduction in the size of the engine and boilers. (3). In amalgamation the pans and settlers consume not...
Page 1 - The extraction of silver by the lixiviation process from ores which have been subjected to a chloridizing roasting, is based upon the fact that silver chloride is easily soluble in solutions of sodium or calcium hyposulphite, and that silver is precipitated from such solutions by an alkaline sulphide, with regeneration of the hyposulphite salts. In case the ore contains lead, a portion of the latter is also dissolved, lead sulphate being soluble in hyposulphite solutions. If, at the same time, copper...
Page 143 - ... added, a shovelful at a time. If it is lumpsulphur, it is not necessary to crush the lumps unless most of them will not pass a screen of 1-inch mesh. The sulphur must be added slowly, as the mass boils violently, and swells to several times its original volume while the chemical action is taking place. Should the lye have been either much less concentrated or of lower temperature than stated above, the solution of the sulphur will not be complete. The sodium sulphide should be made in a cast-iron...
Page 14 - It is most economical to buy the form of soda ash known as "pure alkali" of 58 per cent. made by the Solvay or ammonia process. It is made in this country at Syracuse, New York, and costs 1.4 cents per pound at the works. This alkali, in the form of a white powder, is so pure that it contains 98.7 per cent. of sodium carbonate, the remainder being principally sodium chloride and sulphate, and 0.25 per cent. moisture. On account of the entire absence of the sodium sulphide and caustic soda (which...
Page 115 - The latter, îso. 10 canvas-duck, is cut to a diameter 6 in. greater than the inside of the tank, so that the ends can be pressed into the annular space described above, and kept in position by forcing down a ^-in. rope.
Page 3 - Hence, if a charge of ore is first lixiviated with ordinary sodium- hyposulphite solution to dissolve the silver chloride, and, subsequently, with cuprous hyposulphite, — this solvent is called the extra-solution, — an additional amount of silver is extracted which would have been lost in the tailings by working according to the old method alone.
Page 29 - ... no metals present to decompose the double salt. 5O. Solubility of Silver Carbonates. — Lead can be precipitated by sodium carbonate from the leaching solution. Lead carbonate so found is almost insoluble in sodium- hyposulphite solutions, while the carbonates of silver and copper are very soluble. The carbonates of iron, manganese, zinc, and calcium are also insoluble in hyposulphite solutions. These salts do not get into the hyposulphite solution as they are removed by the wash water, because...
Page 5 - The value of the lost quicksilver, and cost in wear and tear of the pans and settlers, amounts to more than that of the chemicals consumed in the lixiviation process.
Page 4 - In amalgamation the fineness to which the ore has to be crushed is determined by the capacity of the settler to work off coarse sands without loss of quicksilver. It is not practicable to use a coarser screen than No. 30 if the crushing is done by stamps. This is almost equivalent to sifting through a No. 40 revolving screen if the crushing is done by rolls. In lixiviation, pulverizing as coarse as possible is desirable. The limit of coarseness is determined...
Page 115 - The staves and bottoms are 3 inches thick. CA Stetefeld't gives the following directions for making a vat: " The staves should be cut to the sweep of vat and 9 inches longer than the inside height, but not gained for the bottom, and the latter should be without dowel-pins and cut to a diameter 2 inches greater than that of the finished vat. The gaining of the staves, 1 inch deep, is done by hand, leaving a chime of 6 inches below the bottom. The bottom pieces are grooved and joined by a tongue f...