Lithium Hydroxide Solution for Removing Calcium, Magnesium, And Boron

Li2CO3, as the main raw material for preparing other lithium salts, is an important basic lithium salt. With the continuous and rapid development of new energy vehicles and policy support, the demand for Li2CO3 products will continue to increase. By 2025, the demand for Li2CO3 products in the domestic market will reach about 250000 tons.

In recent years, there has been an increasing demand for the quality of Li2CO3 products worldwide, and most primary products cannot meet the requirements. Therefore, it is important to focus on the purification of Li2CO3 crude products.

Due to the limitations of production technology and salt lake brine itself, most primary products are low-cost and high-yield industrial grade Li2CO3. Directly preparing battery grade Li2CO3 from industrial grade Li2CO3 as raw material is a more economical method.

With the rapid development of new energy vehicles, the breakthrough in the process of preparing high-purity battery grade Li2CO3 (99.5-99.9%) from crude Li2CO3 (85-98%) and industrial grade Li2CO3 (98.5-99.0%) as raw materials has become particularly important and is receiving increasing attention.

After adding EDTA to the crude Li2CO3 mixed slurry, saturated Na2CO3 solution is added, and the filter residue is collected, washed, and dried to obtain industrial grade Li2CO3.

Inject high-purity carbon dioxide into the Li2CO3 slurry prepared with ultrapure water to hydrogenate Li2CO3. After a portion of heavy metal ions precipitate, discard the filter residue to obtain a LiHCO3 solution.

The LiHCO3 purified solution obtained in this section contains calcium and magnesium ions as well as borate salts. Calcium and magnesium ions need to be removed, and borate ions need to be removed. The LiHCO3 purified solution is heated to decompose and remove CO2 gas to obtain Li2CO3 crystals. The obtained Li2CO3 crystals are then processed by centrifugation, washing, and drying to obtain battery grade Li2CO3 products.

Haipu HP4020 calcium magnesium resin product has better affinity with metal cations in water when used, and forms more stable chelates with divalent and above metal cations. It has a high precision adsorption and removal effect on trace heavy metals such as calcium and magnesium in the environment of lithium hydroxide purification solution, and also has the characteristic of high removal efficiency.

At the same time, Haipu HPB119 boron removal resin (an organic synthetic polymer material) has a special functional group structure and high selectivity for boron. The coordination group can form a very stable complex with boron, while being inert to other anions, which helps to selectively remove boron ions from water. HPB119 is suitable for: 1) purification of lithium salt solutions such as lithium hydroxide and lithium hydroxide; 2) Preparation of boron free magnesium salt solution; 3) Removal of boron from boron containing water or feed solutions such as salt lake brine, drinking water, irrigation water, etc; 4) Desalination of seawater to remove boron. 5) Regulation of boron content in nuclear reactors.