EP 3638624 A1 20200422 - METHOD OF PRODUCING COMPOUNDS OF LITHIUM AND OPTIONALLY OF OTHER ALKALI METALS
Title (en)
METHOD OF PRODUCING COMPOUNDS OF LITHIUM AND OPTIONALLY OF OTHER ALKALI METALS
Title (de)
VERFAHREN ZUR HERSTELLUNG VON VERBINDUNGEN VON LITHIUM UND OPTIONAL VON ALKALIMETALLEN
Title (fr)
PROCÉDÉ DE PRODUCTION DE COMPOSÉS DE LITHIUM ET ÉVENTUELLEMENT D'AUTRES MÉTAUX ALCALINS
Publication
Application
Priority
- CZ 2017343 A 20170616
- CZ 2018050035 W 20180615
Abstract (en)
[origin: WO2018228618A1] The invention provides a method for recovering lithium and optionally further alkali metal compounds, a mineral from the group of phyllosilicates containing lithium and optionally further alkali metals and also at least 0.2 wt. %, preferably at least 0.9 wt. %, of fluorine, is subjected to a thermal treatment in a furnace at a temperature within the range of from 1100 °C to 1700 °C, preferably at a temperature within the range of from 1220 °C to 1700 °C, at a pressure within the range of from 20 kPa to 150 kPa for a period of 15 to 360 minutes, in the presence of a reagent which contains a) at least one substance from a group comprising carbonates, oxides, hydroxides, sulfates, sulfites and chlorides of alkaline earth metals, in particular calcium; and b) at least one substance capable of releasing chlorine and/or hydrogen chloride and/or sulfur trioxide and/or sulfur dioxide during the thermal treatment, wherein the molar ratio of the total amount of sulfur trioxide and/or sulfur dioxide expressed as S03 and/or of chlorine and/or hydrogen chloride expressed as Cl2 to the total amount of alkali metals including lithium, released from the silicate mineral in the reaction space in the furnace, is at least 0.5, the content of alkaline earth metals, in particular calcium, recalculated as the their oxide content, in the mixture of the phyllosilicate mineral with the reagent is at least 20 wt. %, and the fluorine content in the mixture of the phyllosilicate mineral with the reagent is from 0.1 to 2 wt. %, preferably from 0.2 to 2 wt. %, for decomposition of the structure of the phyllosilicate mineral and for volatilization of lithium compounds and optionally further alkali metal compounds from the thermally treated phyllosilicate mineral, and the compounds of lithium and optionally of further alkali metals are subsequently recovered by condensation by drawing off from 50 to 100 vol. % of flue gas formed in the furnace from the furnace from one or more different places having different temperatures., wherein the rate and volume of the drawn off flue gases from different places can be different for the selective recovery of compounds of individual alkali metals or their groups.
IPC 8 full level
C01D 1/00 (2006.01); C01D 3/00 (2006.01); C01D 15/00 (2006.01); C04B 7/36 (2006.01)
CPC (source: EP)
C01D 1/00 (2013.01); C01D 3/00 (2013.01); C01D 15/00 (2013.01); C04B 7/365 (2013.01); Y02P 10/20 (2015.11)
Citation (search report)
See references of WO 2018228618A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2018228618 A1 20181220; AU 2018285391 A1 20200206; AU 2018285391 B2 20200903; CA 3066286 A1 20181220; CA 3066286 C 20230103; CZ 2017343 A3 20180919; CZ 307465 B6 20180919; DE 18750313 T1 20200507; EP 3638624 A1 20200422
DOCDB simple family (application)
CZ 2018050035 W 20180615; AU 2018285391 A 20180615; CA 3066286 A 20180615; CZ 2017343 A 20170616; DE 18750313 T 20180615; EP 18750313 A 20180615