METHOD OF PRODUCTION OF ESPECIALLY PURE SALT OF LITHIUM AND A DEVICE FOR ITS REALIZATION Russian patent published in 2006 - IPC C01D7/10 C01D7/12 C01D15/08 B01J8/14 

FIELD: chemical industry; pharmaceutical industry; other industries; methods of production of especially pure salts of lithium.

SUBSTANCE: the invention is pertaining to the method of production of especially pure salts of lithium and may be used in chemical, pharmaceutical and other industries. The method provides for bicarbonization of a water solution of a lithium carbonate by carbonic gas at stirring action, filtration of the solution of lithium bicarbonate, its purification on ion-exchange resin, debicarbonization, separation of the lithium carbonate, its flush by hot water and drying. The lithium carbonate is subjected to mechanoactivation; bicarbonization is conducted at the temperature of 0-18°C. The processes of bicarbonization and cleanouts by a sorbent are conducted at the similar temperature, and the processes of bicarbonization and debicarbonization are conducted in the vortex dispersible layer. For production of the high purity lithium fluoride the purified lithium carbonate is subjected to the repeated bicarbonization in the vortex dispersible layer, to filtration and to the subsequent interaction with the fluoridizer. The device consists of aggregates of bicarbonization of the lithium carbonate and debicarbonization of the lithium bicarbonate solution. Both aggregates contain the body with the disposed on it driver of the fan with the air intake, the vortex chamber, the reservoir with the branch-pipe dipped in the working solution. In the aggregate of the lithium carbonate bicarbonization the air intake of the fan, the vortex chamber and the reservoir space above the working solution are combined in the airproof closed gaseous loop with the mounted in it branch-pipe for feeding in it of carbon dioxide and with the carbon dioxide pressure indicator. The vortex chamber is equipped with the feeder with an inlet opening for feeding of the mechanoactivated technical lithium carbonate, which is arranged in the vortex chamber cover and adjacent to the blades of the vortex chamber from its internal side. In the aggregate for debicarbonization on the air intake inlet the air cleaning filter is installed. The aggregate body is supplied with the branch-pipe of the spent gases withdrawal from the space of the reservoir with the working solution connected through a carbon dioxide recuperator with a branch-pipe for inlet of carbon dioxide into the aggregate for the lithium carbonate bicarbonization. In both aggregates the branch-pipe dipped into the reservoir with the working solution is made out in the form of a regulated according to the depth of dipping intake pipe coupled by a pipeline through the circulation pump with the branch-pipe mounted on the cover of the vortex chamber above the hole of the ring type groove between the top cover and the blades of the vortex chamber from its internal side. The driver of the fan is made with an adjustable number of turns of the electromotor. The aggregates are equipped with the aids of adjustment and control. The offered invention allows to increase productivity of the chemical process, ensures optimal modes of operation of reactor equipment of the device, improves quality of the products, reduces charges of maintenance.

EFFECT: the invention ensures an increased productivity of the chemical process, optimal modes of operation of the device reactor aggregates, improved quality of the products, reduction of maintenance charges.

5 cl, 3 dwg, 2 ex