production requirements of ultrafine silicon powder

1. Selection and processing of raw materials

Selection of raw materials:

Metallic silicon is usually used as raw material, but ordinary metallic silicon cannot be directly used to make ultra-fine silicon powder and needs further processing.

Raw material processing:

Raw metal silicon must undergo a high-temperature reduction reaction, such as high-temperature reduction through a smelting furnace, to obtain higher purity metallic silicon.

2. Reduction by Melting and Gasification

Reduction by Melting:

In a hydrogen atmosphere, metallic silicon is melted and reduced to become silicide gas. This step is key to the production of ultra-fine silicon powder and is directly related to the purity and activity of the product.

Gasification:

Silicide gas is converted into nano-sized silicon gas particles in the gasification reactor.

3. Cooling and Grinding

Cooling: After cooling,

the silicon gas particles form a pre-silicon powder.

Grinding:

The cooled silicon powder is crushed into particles and subjected to coarse and fine grinding by cyclone action or other mechanical grinding equipment. The choice of grinding equipment has an important impact on the particle size of the product, such as ball mills, windmills, etc.

4. Classification and Collection

Classification:

The crushed silicon powder needs to be classified by an airflow classifier to ensure that the particle size distribution of the product meets the requirements. The performance of the classifier has a direct impact on the cutting point and particle size distribution of the product.

Collection:

Granular silicon powder needs to be collected, usually it is packed by a packing machine for subsequent storage and transportation.

5. Purity and Quality

Control Purity Requirements:

The purity of ultra-fine silicon powder has an important impact on its performance and applications. Therefore, the purity of raw materials and the purity of the production environment must be strictly controlled during the production process to avoid the ingress of impurities.

Quality Control:

Strict quality control is carried out at every link in the production process, such as raw material inspection, grinding equipment maintenance, and classifier commissioning, to ensure the quality and stability of the product.

6. Particle

Size and Shape Control Particle Size Control:

The particle size of silicon powder can be adjusted by the parameters of the grinding equipment and the classifier settings. With a gradual decrease in the cutting point of the product, the production capacity drops sharply, so it is necessary to reasonably control theparticle size while ensuring product quality.

Shape control:

The shape of silicon powder also has a certain impact on its performance and application. By optimizing the grinding process and classification technology, the shape of silicon powder can be adjusted according to the needs of different fields.

7. Production Equipment and Process

Optimization Production Equipment:

Choosing efficient and stable production equipment is the key to producing ultra-fine silicon powder. For example, the use of advanced grinding technology and airflow classification technology can improve production efficiency and product quality.