Manufacturing Lithium Fluoride Products By The Reaction Of AHF & Lithium Hydroxide (Or Lithium Carbonate).

Lithium fluoride is a versatile raw material that can be utilized for the production of lithium hexafluorophosphate.

It also has applications as a desiccant, flux, and in industries such as enamel and optical glass manufacturing.

High purity lithium fluoride products are produced using electronic grade hydrofluoric acid and electronic grade lithium carbonate as raw materials.

The following chemical equation represents the reaction involved in the production process:

2HF + Li2CO3 → 2LiF + H2O + CO2

The raw material AHF is pumped into the refining unit where it is treated by several rectifying towers to obtain high-purity HF gas.

This gas is then absorbed into the HF solution by pure water.

Industrial lithium carbonate is pulped with pure water and reacts with pure carbon dioxide gas to obtain a lithium bicarbonate solution. After precise filtration, the solution is pumped into an ion exchange tower to remove impurities and obtain a high-purity lithium bicarbonate solution.

The HF metering pump from the refining unit is introduced into the lithium fluoride reaction kettle, and the stirrer is started.

The lithium bicarbonate solution is slowly added to the reaction kettle, stirring, reacting, and crystallizing.

The crystals are concentrated into a slurry in a concentrator, and then introduced into a filter for solid-liquid separation.

The wet solid lithium fluoride product is then sent to an airflow drier via a conveyor.

Part of the filtrate is returned to the lithium fluoride reaction system, while the other part is introduced into the wastewater pretreatment-lithium recovery unit.

The wet lithium fluoride products are introduced into a lithium fluoride silo after airflow drying, where they are either sold or used in the production of lithium hexafluorophosphate after packaging.

The dried tail gas is absorbed by process water to obtain a lithium-containing solution, which is then introduced into the wastewater pretreatment-lithium recovery unit.

The fluoride present in lithium-containing wastewater is precipitated by calcium hydroxide in the form of calcium fluoride, while the supernatant is precisely filtered to obtain a lithium salt solution.

The filter cake calcium fluoride sludge is transported out for disposal.

The lithium salt solution is then pumped into a specialized resin tower for lithium-ion adsorption.

Once the adsorption capacity of the resin is saturated, it is eluted and regenerated using a sodium hydroxide solution.

The adsorption wastewater is introduced into a wastewater collection tank.

The lithium hydroxide solution obtained by resin regeneration is recrystallized to obtain a pure lithium hydroxide solution.

This pure solution is then returned to a lithium fluoride reactor and reacts with hydrofluoric acid to produce lithium fluoride.