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1. WO2022094696 - PROCESS FOR THE PRODUCTION OF LITHIUM HYDROXIDE

Publication Number WO/2022/094696
Publication Date 12.05.2022
International Application No. PCT/CA2021/051528
International Filing Date 29.10.2021
IPC
C01D 15/02 2006.1
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
DCOMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
15Lithium compounds
02Oxides; Hydroxides
C30B 29/10 2006.1
CCHEMISTRY; METALLURGY
30CRYSTAL GROWTH
BSINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
29Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
10Inorganic compounds or compositions
C30B 7/14 2006.1
CCHEMISTRY; METALLURGY
30CRYSTAL GROWTH
BSINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
7Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
14the crystallising materials being formed by chemical reactions in the solution
CPC
C01D 15/02
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
DCOMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
15Lithium compounds
02Oxides; Hydroxides
C01P 2006/80
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
2006Physical properties of inorganic compounds
80Compositional purity
Applicants
  • ROCK TECH LITHIUM INC. [CA]/[CA]
Inventors
  • VOIGT, Wolfgang
Agents
  • NORTON ROSE FULBRIGHT CANADA S.E.N.C.R.L., S.R.L. / LLP
Priority Data
20205404.503.11.2020EP
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) PROCESS FOR THE PRODUCTION OF LITHIUM HYDROXIDE
(FR) PROCÉDÉ POUR LA PRODUCTION D'HYDROXYDE DE LITHIUM
Abstract
(EN) The present invention relates to a process for the production of lithium hydroxide by crystallization of lithium hydroxide monohydrate from a solution of lithium nitrate, comprising the following steps: (a) providing a lithium nitrate-containing solution with a concentration of lithium nitrate of 13.0 – 15.4 mol/kgw, preferably 13.5 – 15.4 mol/kgw, more preferably 14.0 – 15.0 mol/kgw (kgw = kg H2O), (b) adding an approximately stoichiometric amount of sodium hydroxide to the lithium nitrate-containing solution at a temperature within the range of 70 – 85 °C, preferably 75 – 85 °C, in order to crystallize lithium hydroxide monohydrate, and (c) separating the formed lithium hydroxide monohydrate at a temperature within the range of 70 – 85 °C, preferably 75 – 85 °C, preferably by centrifugation and optionally washing of the separated lithium hydroxide monohydrate with water. The process is efficient and lead tohigh yield of lithium hydroxide monohydrate.
(FR) La présente invention concerne un procédé de production d'hydroxyde de lithium par cristallisation de monohydrate d'hydroxyde de lithium à partir d'une solution de nitrate de lithium, comprenant les étapes suivantes : (a) fournir une solution contenant du nitrate de lithium ayant une concentration de nitrate de lithium de 13,0 à 15,4 mol/kgw, de préférence de 13,5 à 15,4 mol/kgw, de préférence encore de 14,0 à 15,0 mol/kgw (kgw = kg H2O), (b) ajouter une quantité approximativement stoechiométrique d'hydroxyde de sodium à la solution contenant du nitrate de lithium à une température dans la plage de 70 à 85°C, de préférence 75 à 85°C, afin de cristalliser le monohydrate d'hydroxyde de lithium, et (c) séparer le monohydrate d'hydroxyde de lithium formé à une température dans la plage de 70 à 85°C, de préférence de 75 à 85°C, de préférence par centrifugation et éventuellement laver le monohydrate d'hydroxyde de lithium séparé avec de l'eau. Le procédé est efficace et permet un rendement élevé de monohydrate d'hydroxyde de lithium.
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