Powder sifter machine graphite powder

Graphite powder is commonly found in everyday life, serving as a raw material for pencil leads and lithium battery negative electrodes. Powder sifter machine graphite powder is typically made of 316L stainless steel, which offers high strength, acid and alkali resistance, and high temperature resistance. The mesh size typically ranges from 50-625, with some equipment capable of reaching 80-530 mesh. Screening capacity varies depending on the equipment model. For example, our airflow sieve can process 100-800 kg per hour. The graphite powder sifter machine features high screening efficiency, high output, excellent sealing to prevent dust escape, stable operation, and easy cleaning and maintenance.

Graphite powder is a powdered material made from natural flake graphite through grinding. It exhibits high-temperature resistance, thermal and electrical conductivity, lubricity, and plasticity. It is commonly used in conductive coatings, refractory materials, metallurgical recarburizers, and high-temperature lubricants.

How does Powder sifter machine graphite powder sieve graphite powder?

Graphite powder sieving requires the use of Powder sifter machine graphite powder. The core principle is to utilize vibration or airflow combined with sieves of varying apertures to achieve classification.

First, select a sieve with the appropriate mesh size based on your needs (e.g., 200-400 mesh is commonly used for purification, while 800 mesh or higher may be required for fine powder production). Pour the graphite powder to be sieved evenly into the sifter's feed port. After the machine is started, a motor generates high-frequency vibrations (or airflow), causing the graphite powder to move irregularly across the sieve. Graphite powder particles smaller than the sieve aperture pass through the sieve holes and fall into the lower receiving device. Coarse particles that are too large remain on the sieve surface and are ultimately discharged through the slag discharge port, completing the initial classification.

For higher precision, a sifter with multiple layers of sieves can be used to separate two to four different size grades of graphite powder at a time.

Powder sifter machine graphite powder equipment selection

Due to the extremely fine nature of graphite powder, its easy release, strong electrostatic adsorption, and tendency to agglomerate, the selection of a suitable Powder sifter machine graphite powder should be based on the specific characteristics of the graphite powder and the desired screening objectives. Four common types of graphite powder screening equipment are as follows:

Circular vibrating screens are suitable for small to medium-sized production needs, processing 1-20 tons of graphite powder per hour. In practical applications, they can be used for both coarse screening of graphite powder to remove large impurities and fine classification, such as screening graphite powder of common sizes like 200 mesh and 325 mesh. They are one of the most widely used powder sifter machine graphite powder equipment in the graphite powder screening industry.

Linear vibrating screens support multi-layer designs with 2-5 decks, giving them a higher throughput advantage, processing 5-50 tons of graphite powder per hour, making them ideal for large-scale production applications. Its core application is the continuous, large-scale grading of graphite powder. For example, in battery anode production, strict particle size requirements are imposed, and linear vibrating screens are often used for screening.

Due to its strong conductivity, graphite powder is prone to friction-generated static electricity during screening, which can cause adhesion to the screen and agglomeration, reducing screening efficiency. Therefore, an anti-static screening machine should be prioritized, such as an ultrasonic vibrating screen. This adds an ultrasonic generator to a traditional machine, transmitting 20-40kHz high-frequency waves to break down agglomerates and prevent clogging. Powder sifter machine graphite powder can process ultrafine graphite powders of 500-1250 mesh and is particularly suitable for fine screening of high-purity graphite powders for lithium battery anodes and photovoltaic applications, preventing agglomeration and impairing purity.

Graphite powder has strong lubricity and low inter-particle friction, resulting in poor flowability and prone to agglomeration, making it difficult to screen. Airflow sieving machines offer a targeted solution. Powered by negative pressure airflow, they eliminate the need for mechanical vibration and can sieve graphite powder to separate coarse powder, improving flowability while preventing particle breakage and secondary agglomeration of ultrafine powders. They are suitable for ultrafine graphite powders with mesh sizes of 1000 or larger (such as nano and colloidal graphite powders) and excel in applications requiring dust-free operation, such as electronic-grade graphite powder. Powder sifter machine graphite powder also offer fine screening and are gentle on heat-sensitive graphite powders.

Powder sifter machine graphite powder ranges for different industries

Graphite powder screening uses different mesh sizes for different industries, placing varying demands on the equipment. Below are the common particle sizes for graphite powder screening in various applications and the equipment suitable for each application.

For lithium-ion batteries: For graphite powder with particle sizes of 10-25μm or even finer, choose an ultrasonic vibrating screen. 20-40kHz ultrasonic waves break up agglomerates, eliminate static electricity, and prevent clogging. The screen uses 316L stainless steel electroformed or nickel-plated mesh to prevent contamination, and explosion-proof design is available.

Powder Metallurgy and Casting: Graphite powder with a particle size of 75-300μm uses a cyclone screen. Negative pressure airflow carries particles through the screen to prevent mechanical vibration-induced particle breakage. Suitable for lubricating-grade graphite with a particle size of 20-100μm, it can be integrated with a demagnetization module, and the screen uses 316L stainless steel woven mesh.

Conductive Materials: Graphite powder with a particle size of 25-75μm uses an ultrasonic vibrating screen to prevent fine powder clogging. High-precision or cyclone screens maintain particle integrity and handle a wide range of particle sizes.

Refractory Materials and Recarburizers: Graphite particles with a coarseness of 0.5-5mm or even larger can be screened using a vibrating screen, driven by a vibrating motor.

For everyday products: Graphite powder with a particle size of 45-75μm, such as for pencil leads and lock core lubricants, choose a three-dimensional vibrating screen. A vertical vibrating motor is used as the excitation source. Six sizes of 1-5 screen layers are available, with fast screen changeover and a processing capacity of 1-3 tons/hour.

For high-purity/high-value-added applications: Graphite powder with a particle size of less than 10μm, such as for graphene precursors, choose a high-precision ultrasonic vibrating screen. Special screens (such as PTFE) and ultrasonic parameters can be adjusted, and a dispersant system can be added for enhanced efficiency.

Powder sifter machine graphite powder is a sieving device for graphite powder. It uses a vibrating screen to grade the graphite powder and separate impurities, ensuring a uniform and fine powder. The machine features a fully enclosed structure to prevent dust escape and is equipped with high-precision stainless steel or nylon screens to withstand corrosive environments. It is easy to operate and has low energy consumption. It is widely used in high-end industrial applications such as lithium batteries and conductive materials, and is a key device for improving product quality and production safety.