| 摘要 |
The invention relates to methods for extracting precious metals and can be used for extracting precious metals (platinum, palladium, gold, etc) from different mineral raw materials containing alkali and alkali-earth metal chlorides, for example a bulk concentrate obtainable from clay-salt wastes (slims) of potassium production, marking clays, etc. The inventive method consists in carrying out the chloridising roasting of the bulk concentrate which is obtainable during the initial material (clay-salt slims) dressing and contains residual chlorides in a quantity raging from 7 to 13 % or a natural concentrate (marking clays) wherein the chloride content is equal to or less than 15 %, in leaching a roasted product by a nitromuriatic acid solution, in sorbing precious metals from a pulp, in carrying out the chloridising roasting of a mineral raw material with a temperature of 600-700 °C, in leaching said precious metals from the sintered product by the diluted nitromuriatic acid solution and in sorbing the precious metals from the thus obtained pulp. The inventive method makes it possible to carry out a combined extraction of platinum group metals, gold and silver from the mineral raw material containing alkali and alkali-earth metal chlorides and to increase the cost effectiveness of the process by using a chlorinating agent contained therein, reducing the number of operations (eliminating a pulp filtration), reducing a roasting temperature in comparison with the prior art and by leaching precious metals from the sintered product by the diluted acid solution. |
