METHOD OF EXTRACTION OF LITHIUM CARBONATE
Technical Field The present invention relates to a method and device for extraction of lithium carbonate. Background of the Invention In us 2004/0005267 a1 described is a method of producing lithium carbonate with low content of sodium salts from containing lithium salt solution. In method mother solution, containing carbonate, obtained at previous stage deposition of, is added in hydrochloric solution for deposition of magnesium in form of magnesium carbonate; solution cao and sodium carbonate is added for removing calcium and residual magnesium; lithium carbonate is precipitated from purified salt solution by adding solution of soda ash; obtained solution filtered to obtain solid lithium carbonate; preparing aqueous suspension of lithium carbonate in reactor, equipped with input of for introduction of gaseous carbon dioxide in said aqueous suspension formation of aqueous lithium bicarbonate solution, said aqueous lithium bicarbonate solution is passed through filter and, if necessary, through ion-exchange column for additional removal of calcium and magnesium; said filtered lithium bicarbonate solution is introduced into the second reactor, the temperature of which is brought to the value of from 60 to 100° with, to provide to precipitate superpure lithium carbonate. In WO 2011/082444 a1 described is a method of producing lithium carbonate, including: firing alpha- spodumenovoi ore or concentrate to produce beta-spodumene, a sulphated at diffusion nnoi temperature, direction of sulfated beta-spodumene to the leaching stage, on which lithium sulfate is leached in water. Enriched with leaching solution is passed through row stages of removing impurities, on which is removed iron, aluminium oxide, silicates and magnesium, sodium carbonate is added product for deposition of calcium, then ion exchange for removing residual of calcium, magnesium and other polyvalent cations of. Purified product is fed to sedimentation of lithium carbonate. In document also described passing precipitated lithium carbonate through bicarbonate cycle, includes treatment with carbon dioxide to produce intermediate product-bicarbonate and subsequent crystallization to obtain the end product-lithium carbonate. In Olivier , with. a. and Nenniger , e. N, continuous process for the production of lithiumcarbonate , CIMBulletin , July 1979, described is a method soda leaching of spodumene concentrate and karbonatizatsii at high pressure. In Galaxy resources Limited , in November 2008 g, published message for printing, related to preliminary tests with production of lithium carbonate for batteries using technology of treatment of calcined soda " SodaAch ". Brief Description of the Invention So, for the present invention is the provision of method and device for extracting lithium carbonate of high purity with high output. Targets of the invention is achieved through method and device, different signs, set forth in independent claims. Preferred of the invention are disclosed in subclaims. The present invention relates to a method for extraction of lithium carbonate from lithium of initial material. Method includes the following stages: -suspended containing lithium of initial material in the presence of water and sodium carbonate to obtain containing lithium suspension; -leaching containing lithium suspension in presence of high-pressure steam to produce solution, containing lithium carbonate; -carbonate formation of solution, containing lithium carbonate, with use of carbon dioxide, in the atmospheric conditions, to obtain a solution, containing bicarbonate of lithium, -separation of solid substance from solution, containing bicarbonate of lithium, by means of separation of on solid and liquid phase, -purification of solution, containing bicarbonate of lithium with production of clean solution, containing bicarbonate of lithium, and -extraction of lithium carbonate by means of its crystallization from purified solution, containing bicarbonate of lithium. In accordance with one embodiment of the present invention, containing lithium initial material can represent any initial material from which can be of extraction of lithium. Usually containing lithium initial material is selected from the group, consisting of saline solution, containing lithium mineral, spodumene, petalita or lepidolita , or their mixtures. In accordance with one embodiment of the present invention, karbonatizatsiyu of solution, containing lithium carbonate, is carried out using carbon dioxide in excess of. In accordance with one embodiment of the present invention, karbonatizatsiyu of solution, containing lithium carbonate, is carried out at temperature environment, usually at temperature approximately from 5 to 40° with. In accordance with one embodiment of the present invention, karbonatizatsiyu of solution, containing lithium carbonate, is carried out at atmospheric pressure. In accordance with one embodiment of the present invention, karbonatizatsiyu of solution, containing lithium carbonate, is carried out by means for supplying carbon dioxide by countercurrent relative to direction of flow of solution, containing lithium carbonate. In accordance with one embodiment of the present invention, solid substances of is separated from solution, containing bicarbonate of lithium, by means of any suitable method of separating on solid and liquid phase, usually by means of thickening and/or filtration. In accordance with one embodiment of the present invention, purification of solution lithium bicarbonate is carried out by means of ion exchange, usually with the use of ion-exchange resin. In accordance with one embodiment of the present invention, crystallization of lithium carbonate is carried out by means of heating solution to temperature, approximately equal boiling point of solution. The present invention also relates to device for extraction of lithium carbonate from lithium of initial material, in accordance with the above method, comprising: -unit 1 suspending containing lithium of initial material in the presence of water and sodium carbonate to obtain containing lithium suspension; -unit 2 leaching of containing lithium suspension in presence of high-pressure steam to produce solution, containing lithium carbonate; -unit 3 karbonatizatsii for of producing solution, containing bicarbonate of lithium, in the atmospheric conditions in the presence of carbon dioxide, -unit 4 separation of on solid and liquid phase for separating of solid substance from solution, -unit 5 of cleaning for producing purified solution, containing bicarbonate of lithium, and -unit 6 crystallization for extraction of lithium carbonate. In accordance with one embodiment of the present invention, unit 3 karbonatizatsii includes mixer. In accordance with one embodiment of the present invention unit 3 karbonatizatsii is under atmospheric pressure. In accordance with one embodiment of the present invention unit 3 karbonatizatsii includes at least one reactor or vessel. Usually unit karbonatizatsii includes two or more reactors or vessels. Brief Description of the Drawings Further the present invention described more are by means of preferable ways to make your with links to dwg, where is presented total unit-circuit and device, consisting of blocks, according to one embodiment of the invention. Detailed Description of the Invention Preferential of the method of invention, as schematic cradle is presented on dwg, represents a method of extraction of lithium carbonate from lithium of initial material, including suspended 1 containing lithium of initial material in the presence of water and sodium carbonate to obtain containing lithium suspension from containing lithium of initial material. After suspending, containing lithium suspension is subjected to leaching 2 for transition containing lithium mineral in solution, as a result of which solution is prepared, containing lithium carbonate. After suspending and leaching, method includes karbonatizatsiyu 3 of solution, containing lithium carbonate, with use of carbon dioxide, in the atmospheric conditions, for producing of solution, containing bicarbonate of lithium. Solid substances of is separated from solution by means of separation of 4 on solid and liquid phase. Solution, containing bicarbonate of lithium, is subjected to purification 5 to obtain purified solution, containing bicarbonate of lithium, and removed by crystallization 6 lithium carbonate from the purified solution, containing bicarbonate of lithium. Method enables to provide continuous economically effective production of lithium carbonate for use in accumulators of high purity and with high output. Containing lithium initial material can represent any pokhodyashchii containing lithium mineral, from which preferably extraction of lithium. Usually containing lithium initial material is selected from the group, consisting of salt solution, containing lithium mineral, spodumene, petalita , lepidolita or their mixtures. Usually containing lithium initial material represents spodumene. In accordance with the embodiment of the present invention, method also can include the preliminary treatment containing lithium of initial material. If necessary, can be carried out heat treatment containing lithium raw material before suspending. For example, spodumene exists in nature in the form of a-spodumene, however, its necessary to convert in p-spodumene before suspending and leaching. For example, can be to by heating and-spodumene or concentrate and-spodumene to temperature of approximately 1050° with for suitable period of time. Suspended may be made in any reservoir or reactor, by bringing into contact containing lithium initial mineral with sodium carbonate and water, to obtain containing lithium suspension. Leaching containing lithium suspension is in suitable autoclave or several in series connected autoclaves in the presence of high-pressure steam. Leaching usually is carried out at temperature from 160° to 250° with. Presence of sodium carbonate and process conditions is brought to formation of lithium carbonate, for example, in case of spodumene, in accordance with the following reaction (1): 2 LiAI (Si03)2 + na2 C03 = 2NaAI (Si03)2 + li2 C03 (1) Before feeding the resulting solution of lithium carbonate on atmospheric karbonatizatsiyu its, if necessary, is diluted with water. After suspending, leaching and possible dilution of, obtained solution, containing solid and/or dissolved lithium carbonate, is sent to the stage of transformation in bicarbonate, on which solution, containing lithium carbonate, is subjected to karbonatizatsii 3 with the use of carbon dioxide, in the atmospheric conditions, to solution, containing bicarbonate of lithium. At karbonatizatsii 3 are mixed using any suitable stirrer, which provides highly efficient distribution of gas, liquid sti and solid substances. Lithium carbonate may be partially in solid form, due to its low solubility of, and its is leached at stage transformation in bicarbonate, on which relative to insoluble lithium carbonate is converted in more soluble bicarbonate by karbonatizatsii by means of gaseous carbon dioxide and water, in accordance with reaction (2). l_i2 C03 +S02 + n2 0 = 2LHC03 (2) Karbonatizatsiyu of solution, containing carbonate, with using carbon dioxide in excess of. Karbonatizatsiyu of solution, containing lithium carbonate, is usually realized at environment temperature, happens at temperature from approximately 5° to 40° with. Karbonatizatsiyu of solution, containing lithium carbonate, is carried out at atmospheric pressure, T. e. at approximately 101.3 kPa. Karbonatizatsiyu is performed at supply of carbon dioxide by countercurrent relative to direction of flow of solution, containing lithium carbonate. When the method is carried out continuously, at least one reactor or vessel used for transformation in bicarbonate. Usually conversion in bicarbonate is carried out using at least two reactors or vessels. Solution, containing bicarbonate of lithium, is separated from the solid substances, contained in solution. Separation of solution, containing bicarbonate of lithium, from solid substances, may be made by means of any suitable method of separating on solid and liquid phase. For example, lithium bicarbonate solution may be guided in thickening agent, from which upper flow may be guided directly to purification, and lower flow is additionally subjected to filtration for extraction of the whole lithium bicarbonate, present in solution. After separation on solid and liquid phase, solution, containing bicarbonate of lithium, is cleaned with the use of proper cleaning method. In accordance with one embodiment of the invention, after separation of liquid and solid phase lithium bicarbonate solution is purified by ion exchange for removal of admixtures, especially, trivalent and/or bivalent metal ions, such as calcium, magnesium, aluminum and iron. Ion exchange is made, for example, using method, described in A finland 121,785. Usually cleaning by ion exchange is carried out using cation-exchange resin, which represents, for example, iminodiuksusnuyu acid (go) or aminofosfonovuyu acid (AFK). Such resin are produced, for example, Rohm & Haas under trade mark Amberlite irc 748 (go) and Amberlite irc 7476 (AFK). Usually cation-exchange resin is resin, which contains polystyrene matrix, cross-linked divinylbenzene, containing aminofosfonovye group. After purification lithium carbonate are extracted by crystallisation at heating of solution, containing bicarbonate of lithium, in unit of crystallization. Lithium carbonate is precipitated in accordance with reaction (3), when solution is heated, containing bicarbonate of lithium. 2 YNSOz + heating = s2 establishment + S02 + n2 0 (3) Is formed containing water suspension and precipitate lithium carbonate. Solid lithium carbonate is separated from obtained suspension by filtration and so is obtained lithium carbonate for use in accumulators. Standard lithium carbonate for use in accumulators has at least 99.5% lithium carbonate. However possible to produce lithium carbonate for use in accumulators of higher quality, containing at least 99.99% lithium carbonate. The present invention also relates to device for extraction of lithium carbonate from lithium of initial material, in accordance with the method according to the present invention. Number of positions on the dwg, referred to in connection with the description of the method, correspond to numbers of positions, referred to in connection with the description of device. Device includes: -unit 1 suspending containing lithium of initial material in the presence of water and sodium carbonate, -unit 2 leaching of containing lithium carbonate suspension in presence of flow of high pressure, -unit 3 karbonatizatsii for of producing solution, containing bicarbonate of lithium, in the atmospheric conditions, in the presence of carbon dioxide, -unit 4 separation of on solid and liquid phase for separating of solid substance from solution, containing bicarbonate of lithium, -unit 5 of cleaning for producing purified solution, containing bicarbonate of lithium, and -unit 6 crystallization for extraction of lithium carbonate. In accordance with one embodiment of the present invention, unit 3 karbonatizatsii includes mixer, which allows efficient mixing for gas distributing, liquid sti and solid substance in solution. In unit 3 karbonatizatsii is under atmospheric pressure and includes at least one reactor or vessel, usually two or more reactors or vessels. Usually separation unit on solid and liquid phase includes thickening agent and/or filtration unit. Usually purification unit includes unit ion exchange. Device includes all inputs, outputs and control-measuring equipment for technological processes, necessary for realization of the method according to the invention. Technician in this engineering obvious, that as the development of technology, invention can be realized by various methods. Invention and its embodiment, are not limited by examples, described above, but can be changed within volume of protection, certain in the formula of the invention. Is An Example Of Method using soda were tested so as at soda leaching of, transformation in bicarbonate in the atmospheric conditions, of cleaning solution by ion exchange and, finally, lithium carbonate precipitation. Method of jointed subjected to with the use of concentrates of lithium mineral (spodumene), containing 3.1 mass. % of lithium. Leaching of concentrate was carried out at temperature from 160° to 250° with in autoclave in solution of sodium carbonate. Conversion in bicarbonate in the atmospheric conditions was carried out in reactor periodic action. Testing system consisted of feeding device gaseous carbon dioxide, heating plate, reverse refrigerator, level sensors ph and okislitelnovosstanovitelnogo potential, and stirrer. Testing was carried out at room temperature, using continuous supply of an in reactor. Should be mentioned, that conversion in bicarbonate in the atmospheric conditions is fast reaction, provided, that is accessible sufficient amount of an. After transformation in bicarbonate, liquid st subjected to purification by ion exchange before crystallization. Lithium carbonate vykristallizovyvali from solution lithium bicarbonate. Results of analysis of the product are presented in table 1. When interrupted formation of gas, suspension and crystals was earlier recovered and filtered, and is washed with water. A method and arrangement for recovering lithium carbonate from a raw material containing lithium, which method comprises pulping (1) the raw material containing lithium in the presence of water and sodium carbonate for producing a slurry containing lithium from the raw material containing lithium. After pulping the lithium-containing slurry is leached (2) for dissolving the lithium in the solution thus producing a solution containing lithium carbonate. After pulping and leaching the method comprises carbonating (3) the solution containing lithium carbonate by using carbon dioxide under atmospheric conditions for producing a solution containing lithium bicarbonate and separating (4) the solids form the solution. The solution containing lithium bicarbonate is purified (5) to produce a purified solution containing lithium bicarbonate, and recovering by crystallizing (6) lithium carbonate from the purified lithium bicarbonate-containing solution. 1. Method of extraction of lithium carbonate from lithium of initial material, including: -suspended containing lithium of initial material in the presence of water and sodium carbonate to obtain containing lithium suspension, -leaching containing lithium suspension in presence of high-pressure steam to produce solution, containing lithium carbonate; - karbonatizatsiyu of solution, containing lithium carbonate, with use of carbon dioxide, in the atmospheric conditions, to obtain a solution, containing bicarbonate of lithium, -separation of solid substance from solution, containing bicarbonate of lithium, by means of separation of on solid and liquid phase, -purification of solution, containing bicarbonate of lithium, to obtain purified solution, containing bicarbonate of lithium, and -extraction of lithium carbonate by means of its crystallization from purified solution, containing bicarbonate of lithium. 1. Method of extraction of lithium carbonate from lithium of initial material, selected from the group, consisting of salt solution, containing lithium mineral, spodumene, petalita or lepidolita , or their mixtures, where said method includes: -suspended containing lithium of initial material in the presence of water and sodium carbonate to obtain containing lithium suspension, -leaching containing lithium suspension in presence of high-pressure steam to produce solution, containing lithium carbonate; - karbonatizatsiyu of solution, containing lithium carbonate, with use of carbon dioxide, in the atmospheric conditions, to obtain a solution, containing bicarbonate of lithium, -separation of solid substance from solution, containing bicarbonate of lithium, by means of separation of on solid and liquid phase, -purification of solution, containing bicarbonate of lithium, by ion exchange to obtain purified solution, containing bicarbonate of lithium, and -extraction of lithium carbonate by means of its crystallization from purified solution, containing bicarbonate of lithium. 2. Method of according to Claim 1, in which containing lithium initial material is selected from the group, consisting of salt solution, containing lithium mineral, spodumene, petalita or lepidolita , or their mixtures. 2. Method of according to Claim 1, in which karbonatizatsiyu of solution, containing lithium carbonate, is carried out using carbon dioxide in excess of. 3. Method according to any of the previous claims, in which karbonatizatsiyu of solution, containing lithium carbonate, is carried out using carbon dioxide in excess of. 3. Method according to any of the previous claims, in which karbonatizatsiyu of solution, containing lithium carbonate, is performed at temperature of approximately from 5° to 40° with. 4. Method according to any of the previous claims, in which karbonatizatsiyu of solution, containing lithium carbonate, is performed at temperature of approximately from 5° to 40° with. 4. Method according to any of the previous claims, in which karbonatizatsiyu of solution, containing lithium carbonate, is carried out at atmospheric pressure. 5. Method according to any of the previous claims, in which karbonatizatsiyu of solution, containing lithium carbonate, is carried out at atmospheric pressure. 5. Method according to any of the previous claims, in which karbonatizatsiyu of solution, containing lithium carbonate, is performed at supply of carbon dioxide by countercurrent relative to direction of flow of solution, containing lithium carbonate. 6. Method according to any of the previous claims, in which karbonatizatsiyu of solution, containing lithium carbonate, is performed at supply of carbon dioxide by countercurrent relative to direction of flow of solution, containing lithium carbonate. 6. Method according to any of the previous claims, in which separation of solid substances from solution, containing bicarbonate of lithium, is carried out by means of thickening and/or filtration. 7. Method according to any of the previous claims, in which separation of solid substances from solution, containing bicarbonate of lithium, is carried out by means of thickening and/or filtration. 7. Method according to any of the previous claims, in which ion exchange is carried out using cation-exchange resin. 8. Method according to any of the previous claims, in which purification of solution lithium bicarbonate is carried out by means of ion exchange. 8. Method according to any of the previous claims, in which crystallization of lithium carbonate is carried out by means of heating of solution, containing bicarbonate of lithium, to temperature, approximately equal boiling point of solution. 9. Method according to any of the previous claims, in which ion exchange is carried out using cation-exchange resin. 9. Device for extracting lithium carbonate from lithium of initial material, in accordance with the method according to any of claims 1-10, including: -unit (1) suspending containing lithium of initial material in the presence of water and sodium carbonate, -unit (2) leaching of containing lithium suspension in presence of high-pressure steam, -unit (3) karbonatizatsii for of producing solution, containing bicarbonate of lithium, in the atmospheric conditions, in the presence of carbon dioxide, -unit (4) separation of on solid and liquid phase for separating solid substances from solution, containing bicarbonate of lithium, -unit (5) ion exchange for obtaining purified solution, containing bicarbonate of lithium, and -unit (6) of crystallization for extraction of lithium carbonate. 10. Method according to any of the previous claims, in which crystallization of lithium carbonate is carried out by means of heating of solution, containing bicarbonate of lithium, to temperature, approximately equal boiling point of solution. 10. Device according to Claim 9, in which unit (3) karbonatizatsii includes mixer. 11. Device for extracting lithium carbonate from lithium of initial material, in accordance with the method according to any of claims 1-10, including: -unit (1) suspending containing lithium of initial material in the presence of water and sodium carbonate, -unit (2) leaching of containing lithium suspension in presence of high-pressure steam, -unit (3) karbonatizatsii for of producing solution, containing bicarbonate of lithium, in the atmospheric conditions, in the presence of carbon dioxide, -unit (4) separation of on solid and liquid phase for separating solid substances from solution, containing bicarbonate of lithium, -unit (5) cleaning of for producing purified solution, containing bicarbonate of lithium, and -unit (6) of crystallization for extraction of lithium carbonate. 11. Device according to Claim 9 or U. 10, in which unit (3) karbonatizatsii is at atmospheric pressure. 12. Device according to Claim 11, in which unit (3) carbonization includes mixer. 12. Device according to any of claims 9-11, in which unit (3) karbonatizatsii includes at least one reactor or vessel. 13. Device according to Claim 11 or U. 12, in which unit (3) karbonatizatsii is at atmospheric pressure. 13. Device according to any of claims 9-12, in which unit (3) karbonatizatsii includes two or more reactors or vessels. 14. Device according to any of claims 11-13, in which unit (3) karbonatizatsii includes at least one reactor or vessel. 14. Device according to any of claims 9-13, in which separation unit on solid and liquid phase includes unit thickening and/or filtration unit. 15. Device according to any of claims 11-14, in which unit (3) karbonatizatsii includes two or more reactors or vessels. 16. Device according to any of claims 11-15, in which separation unit on solid and liquid phase includes unit thickening and/or filtration unit. 17. Device according to any of claims 11-16, in which purification unit includes unit ion exchange. Method of extraction of lithium carbonate
Element, % crystals U2CO3 from solution CI OF- <0.005 Ca <0.01 Xi <0.01 Fe <0.02 TO <0.02 Na <0.01 Mg <0.01 Μη <0.01 Ni <0.01 P <0.02 Pb <0.01 Ζη <0.01 S (elementary) <0.05 soT <0.06