Polysilicon is a high-purity silicon material consisting of multiple small crystalline particles, often with a purity of 99.9999% or more, and is a core raw material for the photovoltaic solar cell and semiconductor industries. It is produced through a chemical purification process that is low-cost and cost-effective, and is widely used in solar panel and integrated circuit manufacturing. The production of polysilicon requires a high degree of purity, and materials such as activated carbon are commonly used in the purification process. As a basic material for the new energy photovoltaic industry, polysilicon plays a crucial role in promoting the development of clean energy.
Activated carbon plays a crucial role in polysilicon production. Its strong adsorption capacity can effectively remove impurities from gases and liquids, ensuring the high purity of raw materials, thus enhancing the quality of polysilicon and the performance of photovoltaic modules. Meanwhile, the application of activated carbon in tail gas treatment and wastewater purification significantly reduces pollutant emissions and plays an important role in environmental protection.
In polysilicon production, there are several processes that require the use of activated carbon.
Carrier gases such as hydrogen and nitrogen are widely used in the polysilicon production process. However, these gases may contain impurities such as moisture, oxygen, hydrocarbons, etc. If left untreated, the quality of polysilicon will be seriously affected. Activated carbon, with its strong adsorption capacity, can effectively remove these impurity gases and ensure the purity of the raw gas.
Tail gases (such as hydrogen chloride, chlorine, etc.) generated in the production process also need to be adsorbed and treated with activated carbon to reduce the emission of harmful substances and protect the environment.
Commonly used activated carbon types:
Coal-based activated carbon: suitable for efficient adsorption of hydrocarbons, moisture and other impurities. Coconut shell activated carbon: with high adsorption capacity, it is suitable for treating high purity gases.
The use of organic solvents and cleaning fluids is indispensable in the production of polysilicon. However, these liquids may contain trace amounts of impurities that affect the effectiveness of the chemical reaction and the quality of the final product. Activated carbon ensures the high purity of solvents and cleaning liquids by adsorbing organic contaminants in the liquids, thereby enhancing polysilicon production efficiency and product quality.
Commonly used activated carbon types and indicators:
Wooden activated carbon: suitable for purification of organic solvents with high adsorption efficiency.
Granular activated carbon: used in liquid filtration systems to remove tiny particles and organic pollutants.
Its high specific surface area and stable chemical properties can effectively enhance the activity and selectivity of the catalyst, thus optimizing the reaction efficiency and reducing production costs.
Commonly used activated carbon types and indicators:
High Specific Surface Area Activated Carbon: Suitable for use as a catalyst carrier to provide more active sites. Specification: Specific surface area ≥ 1500 m²/g, ash content ≤ 2%, particle size 2-4 mm.
Wastewater generated during polysilicon production may contain organic pollutants and heavy metal ions. Activated carbon for wastwater treatment adsorbs these harmful substances to ensure that the wastewater is discharged according to the standards, reducing the pollution of the environment and helping the enterprise to realize the goal of green production.
Cylinder activated carbon: suitable for wastewater treatment system, with large adsorption capacity and long service life.
Powdered activated carbon: used for rapid adsorption of pollutants in wastewater, suitable for emergency treatment.
Activated carbon plays an irreplaceable role in polysilicon production. It is not only the “guardian” of high-purity polysilicon production, but also a “contributor” to the green development of the new energy photovoltaic industry. In the future, with the continuous progress of photovoltaic technology, the application value of activated carbon will be further highlighted, contributing more power to the popularization of clean energy.
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