Method for manufacturing lithium hydroxide

2:

• The method according to claim 1, wherein the calcium compound is at least one selected from the group consisting of calcium hydroxide and calcium chloride.

3:

• The method according to claim 2, wherein the calcium compound is calcium hydroxide.

4:

• The method according to claim 1, wherein the lithium ion aqueous solution has a concentration of calcium ion of 20 ppm by mass or less.

5:

• The method according to claim 1, further comprising
• subjecting the lithium ion aqueous solution to a chelate treatment.

6:

• The method according to claim 5, wherein the lithium ion aqueous solution after the chelate treatment has a concentration of calcium ion of 10 ppm by mass or less.

7:

• The method according to claim 1, comprising
• washing the solid matter with a washing fluid, and subjecting a washed matter formed through the washing to solid-liquid separation.

8:

• The method according to claim 7, wherein a liquid obtained through the solid-liquid separation of the washed matter is mixed with the lithium ion aqueous solution.

9:

• The method according to claim 1, wherein an amount of the calcium compound used is 1.0 mol or more and 2.0 mol or less per 1.0 mol of lithium carbonate.

10:

• The method according to claim 1, wherein the recovering to the recovery liquid is performed at a temperature regulated to 50° C. or more.

11:

• The method according to claim 1, wherein the recovering to the recovery liquid is performed at a pH of the lithium ion aqueous solution regulated to 11 or more and 14 or less.

12:

• The method according to claim 1, wherein the obtaining lithium hydroxide from the recovery liquid is performed by performing solid-liquid separation through crystallization of the recovery liquid.

13:

• The method according to claim 1, wherein the solid raw material contains at least one atom selected from the group consisting of a sodium atom, a potassium atom, a magnesium atom, a calcium atom, an iron atom, a cobalt atom, a nickel atom, a zinc atom, an aluminum atom, a silicon atom, a lead atom, a boron atom, a phosphorus atom, a sulfur atom, a fluorine atom, a chlorine atom, and a bromine atom.

14:

• The method according to claim 1, wherein lithium hydroxide obtained in the obtaining lithium hydroxide is at least one selected from the group consisting of lithium hydroxide monohydrate and anhydrous lithium hydroxide.

15:

• The method according to claim 14, wherein the lithium hydroxide has a purity of 98% or more.

16:

• The method according to claim 1, wherein the solid raw material containing lithium carbonate is a solid raw material containing lithium carbonate derived from at least one recycled battery selected from the group consisting of a recycled lithium ion battery and a recycled all-solid-state lithium ion battery.

17:

• An electrochemical apparatus comprising lithium permselective membrane, and recovering lithium ion to a recovery liquid, from a lithium ion aqueous solution obtained by subjecting a calcium carbonate-containing liquid obtained by mixing a solid raw material containing lithium carbonate, and a calcium compound, in a medium, to solid-liquid separation, so as to remove a solid matter containing calcium carbonate.