Battery Grade Lithium Carbonate

2023-01-30

As a basic raw material, lithium carbonate is widely used in industries such as batteries, ceramics, metallurgy, and medicine. The largest market demand is battery-grade lithium carbonate, which is an important raw material for the preparation of lithium cobaltate, lithium manganate and lithium iron phosphate cathode materials. The steady growth of 3C electronic products and the rise of new energy vehicles have greatly promoted the development of the entire lithium battery industry chain. As one of the important raw materials for 3C lithium batteries and power batteries for new energy vehicles, lithium carbonate has a huge market demand. , and prices have also risen. The production and sales of new energy vehicles in China have not yet been fully released, the gap between supply and demand of lithium carbonate is still very large, and the resource barriers and technical barriers of lithium carbonate are also very serious.

The whole process of power battery manufacturing must strictly control metal magnetic foreign objects

Studies have shown that trace metal impurities in lithium-ion batteries will affect their safety and service life: when the external power supply voltage is higher than the metal foreign matter in the positive electrode of the battery [iron (Fe), copper (Cu), chromium (Cr), nickel (Ni ), zinc (Zn), silver (Ag), etc.] when the oxidation-reduction potential is reached, the metal foreign matter in the positive electrode of the battery will be oxidized into metal ions, migrate to the negative electrode of the battery, and deposit on the negative electrode of the battery, attaching to the lithium-ion battery as metal dendrites On the negative electrode, metal dendrites piercing the diaphragm will cause a short circuit inside the lithium-ion battery and cause rapid self-discharge. The self-discharge of the lithium-ion battery not only affects its battery life, but also may lead to thermal runaway of the power battery, and even spontaneous combustion and explosion. Therefore, the whole process of power battery manufacturing must strictly control the metal magnetic foreign matter. Products that fail to meet customer needs and have unstable product quality will no longer have a market and will be eliminated. In order to meet the market demand, the majority of lithium carbonate manufacturers have taken corresponding measures to control magnetic foreign matter.

Production Process

In lithium carbonate, demagnetization/slurry liquid and dry powder dry powder demagnetization demagnetization, among them, demagnetization demagnetization demagnetization demagnetization demagnetization demagnetization demagnetization demagnetization magnetic device magnetic device magnetic device magnetic device processing liquid liquid liquid and Composition of 12000gs with slurry, connection connection delivery for substance substance substance substance substance substance

Precipitated and crystallized lithium is separated from solid and liquid by centrifugation, and then: generally two: first: first: first, first, after, after, after, after, after, after, after, after, after, after, after, after, after, after, after, after After crushing, the product is then iron remover to obtain battery-grade lithium carbonate dry crushing. The mechanical wear of the equipment in the conveying stage is the content of magnetic foreign matter in the product.

Since the current lithium carbonate production process is distributed with pipeline iron removers to reduce magnetic impurities in materials or products, the content of magnetic substances in crude lithium carbonate and powder lithium carbonate produced by precipitation and crystallization is not the most original data, so It is difficult to directly define the contribution rate of raw and auxiliary materials carrying or mechanical wear of equipment to the content of magnetic substances in products. Based on theoretical analysis and actual production experience, it can only be inferred from the composition of magnetic foreign substances that mechanical wear of equipment in the production process is an important factor for magnetic foreign substances in lithium carbonate. source.

Personnel And Production Management

Front-line operators do not know enough about the basic knowledge of magnetic substances in the product, and their operations are highly random. In the daily production management work, no effective demagnetization management system has been established, the prevention is neglected, and the 5S management work is missing.

Personnel

No matter what kind of advanced technology and advanced equipment, it must be completed by people. The level of production management and the level of operator technology will be related to the final quality of the product. Magnetic substances are easily introduced during improper operation. Employees should first consciously realize that the content of magnetic substances will cause serious harm to downstream products, and then go deep into the operation level to improve bad operation behaviors that lead to the introduction of magnetic substances.

Materials

Raw and auxiliary materials to be used in production shall be proposed with magnetic substance content standards, and magnetic substance detection items shall be added to incoming raw materials to prevent the final product quality from being affected by excessive magnetic substances in raw materials.

It is also necessary to establish an effective sampling method for the intermediate product solution and wet slurry to monitor the introduction point of magnetic substances during the production process.

The finished product packaging should also be protected from the introduction of magnetic substances. The surface of the packaging bag should use a vacuum cleaner or a magnetic rod to absorb the magnetic substances attached to the surface, and a multi-layer stretch film should be used for protection.

Machines And Equipment

Check the tools used in the production site, and replace all iron tools with plastic tools. Such as material shovels, cleaning tools, sampling tools, etc. Derust the rusty parts of each post and take anti-corrosion measures, and replace severely corroded equipment.

Increase demagnetization facilities, install pipeline iron remover for solution feeding, and install rotary iron remover and electromagnetic iron remover for solid materials. Check all iron equipment, and replace them with other materials or transportation methods, such as using non-metallic equipment such as ceramics, changing screw conveying materials to belt conveying or vacuum feeding devices. By selecting demagnetization equipment with excellent performance, reasonably arranging the demagnetization process, and strengthening on-site control and other measures, it is ensured that the magnetic content of lithium carbonate products is qualified.