How do I produce high-purity silicon from industrial silicon powder?

How to produce high-purity silicon from industrial silicon powder? A brief discussion on the application of Raymond mill in industrial silicon powder production.

Industrial silicon powder is widely used in organic silicon, monocrystalline silicon, polycrystalline silicon, high-tech ceramics, refractory materials, powder metallurgy and other industries. The deep processing of high-purity silicon powder uses physical methods to process and purify industrial silicon powder. This technology uses ordinary industrial silicon as the production material and is processed by physical methods. Using automated operating system control to achieve high-purity silicon powder that improves grade, eliminates impurities, maintains the hardness of the silicon crystal, and does not change the structure. Raymond mill is the main equipment for producing high-purity silicon from industrial silicon powder. As a manufacturer of Raymond mill, Guikuang Machinery will introduce how to produce high-purity silicon from industrial silicon powder.

The key steps for producing high-purity silicon from industrial silicon powder include:

Preparation of smelted silicon: React silicon dioxide with carbon reducing agent through high-temperature smelting to obtain smelted silicon ingots.

Refining and smelting silicon: Using different iron-making processes, such as oxygen gas blowing or arc melting, to remove impurities.

Crush and grind: Crush and grind the refined silicon ingots to obtain industrial silicon powder.

How to produce high-purity silicon from industrial silicon powder? The production of high-purity silicon powder is to clean qualified industrial silicon with pure water, crush it into small particles, and after electromagnetic primary selection, send it to the first and second-level Raymond mill and ultra-fine Raymond mill to grind to 200~400 mesh. During the preparation process, add an appropriate amount of pure water, and the ground silicon liquid flows into the sedimentation tank for liquid phase deposition. Then add a catalyst with an acid value of 6 and start stirring for 2 to 3 hours to precipitate the impurities in the silicon liquid. After drying, The air is crushed for electromagnetic selection and screening, and finally enters vacuum packaging through cyclone collection equipment. The specific process flow is: raw material pretreatment → initial magnetic separation → liquid phase deposition → stirring and catalysis → cleaning → drying → electrostatic magnetic separation → packaging → finished product.

High-purity silicon powder production equipment is composed of cleaning device, primary magnetic separation, grinding system, settling system, drying system, magnetic separation, and cyclone collection system. Auxiliary facilities include power supply system and water purification system.

Cleaning system: It consists of an electric rolling screen and a high-pressure water gun. Through the rotation of the rolling screen, the high-pressure water gun cleans the impurities on the silicon block, and then uses the transfer belt to enter the first-level Raymond mill for grinding.

Primary magnetic separation: It is composed of a power magnetic separator and a magnetic separation belt. The silicon powder produced by the first-level Raymond mill has a fineness of 10 to 20 mesh. The magnetic separation belt absorbs the iron substances contained in the silicon powder.

Grinding system: It consists of a secondary Raymond mill and an ultra-fine Raymond mill. The silicon powder after primary magnetic separation enters the secondary Raymond mill through the conveyor belt and is ground to 200 mesh. Pure water is added during the grinding process. To cool down and eliminate dust, the silica fume slurry ground through two-stage Raymond grinding goes into ultra-fine Raymond grinding to 400 mesh.

Sedimentation system: It consists of a settling tank and a filter. Grind the silica fume slurry to 400 mesh, add degrading acid in the settling tank, and continuously stir the degrading acid to react with the calcium and aluminum in the silica fume and blend into the water. After the silica fume slurry is precipitated, it enters Drying system.

Drying system: It consists of a slurry dehydrator and a dryer. The silicon fume slurry is dehydrated by the dehydrator and then enters the dryer for drying.

Electrostatic electromagnetic separation system: It consists of an air crusher and an electrostatic electromagnetic separator. The dried silicon powder is crushed into powder by the air, and the ferric oxide and iron substances in the silicon powder are absorbed by the electrostatic electromagnetic separator.

Cyclone collection system: It consists of a cyclone collector and a silo. The processed silicon powder is collected by the cyclone collector and then enters the silo.

The main equipment and supporting projects for deep processing of high-purity silicon powder are as follows:

1. Mechanical equipment: Raymond machine, sedimentation system, magnetic separation, cyclone collector, recovery system, wind crusher, pure water device, axial flow motor

2. Electrical equipment: transformers, high-voltage cabinets, low-voltage control systems, power distribution.

3. Environmentally friendly dust removal equipment.

4. Main factory building.