The present disclosure relates to a method for isotopic separation of lithium, the method comprising:providing a first mixture (104) comprising at least lithium, lithium hydride, and possibly lithium deuteride and/or lithium tritide, the first mixture being at a first temperature;a first cooling step (110), preferably a uniform cooling, adapted to cooling the first mixture at a second temperature lower than the first temperature; the first cooling step being adapted to precipitating a first part of the lithium hydride having a first lithium isotope;a first separation step (124) adapted to separating the precipitated first part of the lithium hydride from the first mixture, forming a second mixture (122).

The present disclosure relates to a method for isotopic separation of lithium, the method comprising:providing a first mixture (104) comprising at least lithium, lithium hydride, and possibly lithium deuteride and/or lithium tritide, the first mixture being at a first temperature;a first cooling step (110), preferably a uniform cooling, adapted to cooling the first mixture at a second temperature lower than the first temperature; the first cooling step being adapted to precipitating a first part of the lithium hydride having a first lithium isotope;a first separation step (124) adapted to separating the precipitated first part of the lithium hydride from the first mixture, forming a second mixture (122).

The present disclosure relates to a method for separating lithium from a lithium mixture, the method comprising: providing a first mixture (104) comprising lithium, lithium hydride, and at least a first compound among lithium deuteride and lithium tritide, the first mixture being at a first temperature: a first stirring step (108) adapted to stirring the first mixture: a first cooling step (110) adapted to cooling. preferably uniformly. the first mixture to a second temperature lower than the first temperature: the first stirring and cooling steps being adapted to deposit at least part of the first compound: and a first separation step (116) adapted to separating at least the deposited first compound from the first mixture. forming a second mixture (118) comprising at least lithium and lithium hydride.

The present disclosure relates to a method for separating lithium from a lithium mixture, the method comprising: providing a first mixture (104) comprising lithium, lithium hydride, and at least a first compound among lithium deuteride and lithium tritide, the first mixture being at a first temperature: a first stirring step (108) adapted to stirring the first mixture: a first cooling step (110) adapted to cooling. preferably uniformly. the first mixture to a second temperature lower than the first temperature: the first stirring and cooling steps being adapted to deposit at least part of the first compound: and a first separation step (116) adapted to separating at least the deposited first compound from the first mixture. forming a second mixture (118) comprising at least lithium and lithium hydride.

The present disclosure relates to a method for processing a liquid by-product of sodium borohydride hydrolysis to obtain a borate compound, the method comprising the following steps: separating the liquid by-product by sedimentation, to obtain a borate-rich supernatant; drying the borate-rich supernatant under vacuum to obtain a solid composition comprising a borate compound. An aspect of the present disclosure relates composition obtainable by the disclosed method comprising at least 90% (w/w) of sodium boron hydroxide and its use as a source of borate in the production of sodium borohydride and/or hydrogen.

The present disclosure relates to a method for processing a liquid by-product of sodium borohydride hydrolysis to obtain a borate compound, the method comprising the following steps: separating the liquid by-product by sedimentation, to obtain a borate-rich supernatant; drying the borate-rich supernatant under vacuum to obtain a solid composition comprising a borate compound. An aspect of the present disclosure relates composition obtainable by the disclosed method comprising at least 90% (w/w) of sodium boron hydroxide and its use as a source of borate in the production of sodium borohydride and/or hydrogen.