RU2002123361A - A method of manufacturing molded articles from inorganic cyanides and products obtained by this method - Google Patents

Claims (8)

1. A method of manufacturing molded articles from inorganic cyanides, especially alkali and alkaline earth metal cyanides, which consists in molding a crystalline particle-shaped inorganic cyanide using a particle-shaped compression molding apparatus of cyanide, characterized in that it is separated from the mother liquor during crystallization the solution using a device for the separation of solid and liquid phases, a crystalline cyanide with a total moisture content of from 2 to 15 wt.% served without adding auxiliary substances forming into the briquetting or tabletting device and applying pressure are pressed into molded products with a moisture content of 0.1 to 6 wt.%, while the moisture content in the molded products is always lower than the moisture content in the mold used for their manufacture. 2. The method according to claim 1, characterized in that the pressing in the molding device is carried out at a temperature of from 40 to 70 ° C without subsequent drying of the obtained molded products. 3. The method according to claim 1 or 2, characterized in that the molding is carried out using a briquetting machine, the press rolls of which have working surfaces with a profile corresponding to the shape of the manufactured molded products. 4. The method according to any one of claims 1 to 3, characterized in that the cyanide crystallizate is fed into a molding device with a moisture content of 4 to 13 wt.% From a drum filter or with a moisture content of 2 to 10 wt.% From a centrifuge. 5. A method according to any one of claims 1-4, characterized in that the molded articles is processed with sodium cyanide crystallisate supplied from the drum filter or centrifuge, and the crystals are pressed at a temperature above the transition temperature of sodium cyanide dihydrate (T = 35,7 ° _converted C), at least partially removing moisture from it. 6. The method according to any one of claims 1 to 5, characterized in that the formation of sodium cyanide is carried out at a temperature above 40 ° C by applying pressure, which removes moisture to a residual moisture content (adhesive moisture and hydrates) in the molded products to a level ranging from 0.5 to 5 wt.%. 7. Briquettes from inorganic cyanides, primarily from cyanides of alkali and alkaline earth metals, especially briquettes from sodium cyanide, obtained by the method according to any one of claims 1 to 6. 8. Briquettes according to claim 7, characterized in that the content of metal hydroxide used to obtain cyanide in them is from 0.1 to 1 wt.%, Primarily from 0.2 to 0.7 wt.%.