Lithium pyroxene is a lithium-rich ore that is widely used to extract lithium compounds. Among them, battery-grade lithium carbonate is a key raw material for electric vehicles and energy storage, and its market demand is growing. The production of battery-grade lithium carbonate by burning brine is becoming a competitive production process.

Firstly, lithium pyroxene is crushed and ground fine for subsequent processing. The process of crushing and grinding can be realised by various mechanical means, such as ball mills and crushers. These devices are capable of crushing lithium pyroxene into tiny particles and increasing its surface area, which is conducive to the subsequent reaction.

Next, the lithium pyroxene powder is mixed with brine and the reaction is carried out at a certain temperature. The water in the brine will react with the lithium oxide in the lithium pyroxene to produce lithium hydroxide and carbon dioxide. This reaction step is the core of the whole process, and the reaction temperature and time need to be controlled. Typically, the reaction temperature is controlled at around 100°C, and the time is determined on a case-by-case basis.

Once the reaction is complete, the resulting lithium hydroxide needs to be filtered and washed to remove impurities and brine residues. The filtration and washing process can be carried out by various filtration equipment and washing towers. In this process, the conditions of filtration and washing, such as temperature, pressure, flow rate, etc., need to be controlled to ensure the effectiveness of filtration and washing.

Next, the filtered lithium hydroxide solution is evaporated and concentrated to remove excess water. The process of evaporation and concentration can be carried out by various evaporators and concentrators. In this process, the conditions of evaporation and concentration, such as temperature, pressure, and evaporation speed, need to be controlled to ensure the effect of evaporation and concentration.

Finally, the concentrated lithium hydroxide solution needs to undergo a carbonation reaction to be converted into lithium carbonate. In this process, carbon dioxide and lithium hydroxide react to produce lithium carbonate and hydroxide ions. This step is also the core of the whole process, and the reaction temperature and time need to be controlled. Typically, the reaction temperature is controlled at around 20°C, and the time is determined on a case-by-case basis.