The chemical raw material lithium hydroxide

About lithium hydroxide

Lithium hydroxide is an important basic lithium salt product. Traditional application areas are mainly glass ceramics, petrochemical, etc., but with the global demand for high-nickel lithium batteries heating up, battery materials have become the core driving force of the global lithium hydroxide market. Lithium base grease prepared from lithium hydroxide has the advantages of long service life, oxidation resistance, high temperature stability, etc. As an additive to alkaline batteries, lithium hydroxide can increase the storage capacity and extend the battery life.
In addition, lithium hydroxide has important applications in metallurgy, atomic energy, chemical reagents, aerospace, national defense industry and other fields.

Chemical reaction

1, lithium hydroxide in the case of isolated air, heating to 600℃, lithium oxide and water, chemical reaction equation:
2LiOH=Li2O+H2O.

2, under the condition of heating, lithium hydroxide and magnesium or calcium action, both to produce lithium metal and the corresponding oxide.

1) 2LiOH+Mg=2Li+MgO+H2O

2) 2LiOH+Ca=2Li+CaO+H2O

3. Lithium hydroxide reacts with chlorine or iodine to produce lithium halide and lithium subhalide.

(1) 2LiOH+Cl2=LiCl+LiOCl+H2O

2LiOH+I2=LiI+LiOI+H2O

4, lithium hydroxide and zinc action to form lithium zincate and hydrogen, chemical reaction equation:

2LiOH+Zn=LiZnO2+H2.

5, lithium hydroxide and acid neutralization reaction, generating the corresponding acid of lithium salt (or lithium salt hydrate) and water.

(1) LiOH+HBO2+7H2O=LiBO2·8H2O

(2) 2LiOH+H3PO4=Li2HPO4+2H2O

(3) 2LiOH+H2SO4=Li2SO4+2H2O

(4) LiOH(excess)+HClO4=LiClO4+H2O

6, lithium hydroxide with ammonium chloride and mercury tetraiodide (II) lithium mixture, calcium chloride or barium chloride, can produce lithium chloride.

(1) 4LiOH+2Li2HgI4+NH4Cl=LiCl+7LiI+Ohg2NH2I+3H2O

(2) 2LiOH+CaCl2=2LiCl+Ca(OH)2

(3) 2LiOH+BaCl2=2LiCl+Ba(OH)22

Preparation method Lithium hydroxide monohydrate can be prepared by reacting lithium carbonate with calcium hydroxide. In this reaction, since the solubility of both raw materials is relatively small, it must be fully stirred. The above reaction can only obtain a solution containing 3.5% concentration of this product, and the solubility of lithium carbonate will be reduced due to the generation of lithium hydroxide, and will remain in the precipitation of calcium carbonate without dissolution.

Therefore, with the progress of the reaction, it is necessary to remove the calcium carbonate precipitation at any time, and wash and recover lithium carbonate. The mother liquor after calcium carbonate precipitation is removed and further reduced pressure concentration can precipitate monohydrate. After separation, monohydrate can be obtained by drying at 130 ~ 140℃. Anhydrous lithium hydroxide can be prepared by drying the monohydrate at 150 ~ 180℃.