| 摘要 |
In a process of producing lithium carbonate from decrepitable ores or ore concentrates which contain lithium, particularly from alpha-spodumene, petalite and lepidolite, the ore or ore concentrate is transformed at temperatures from about 800 to 1100.degree.C to a form from which the lithium component can be leached, the lithium in the decrepitated material is converted to lithium sulfate by a solubilizing roasting treatment with a surplus of concentrated sulfuric acid. The roasted product is leached with water and the extract is filtered from the residue, precipitated impurities are removed from the filtrate and the latter is subsequently treated with a concentrated sodium carbonate solution to effect a precipitation of lithium carbonate, which is recovered to transform the disintegrated ore or ore concentrate into a leachable form. The disintegrated ore or ore concentrate is transformed to a leachable form in that it is subjected to a shock heating to at least 800.degree.C and not in excess of 1300.degree.C as it is introduced into a circulating fluidized bed. |
