Dust Removal Technology
The following dust removal technologies are mainly used for particulate matter in silica waste gas:

* **Bag Filter:** Dust-laden gas enters the dust collector housing. Coarse particles are pre-separated in the ash hopper; fine dust is intercepted by the filter bags, and clean gas is discharged by the fan.

* **Wet Electrostatic Precipitator:** Suitable for high humidity (>60%RH) conditions. It uses lead-antimony alloy barbed wire with fiberglass anode tubes. The spray system uses 0.5% NaOH solution to neutralize acidic components.

* **Cyclone Dust Collector:** Removes large rubber particles (>50μm) with an efficiency ≥90%. It is typically used as a pretreatment device.

Dust can be recycled. After vibrating screening, qualified products (<45μm) can be returned to the production process, while agglomerated materials are sent to a calcining furnace for regeneration at 800℃.

Desulfurization and Denitrification Technologies For gaseous pollutants such as SO2 and NOx in precipitated silica waste gas, the following technologies are mainly employed:

Dry Desulfurization and Denitrification: Utilizes an electron accelerator to generate a large amount of high-energy plasma, which oxidizes sulfur oxides in the flue gas.

Wet Desulfurization and Denitrification: Uses strong oxidants (such as chloric acid) to oxidize sulfur oxides and other pollutants in the flue gas.

SCR Denitrification Technology: Under the action of a catalyst (usually a precious metal such as platinum or palladium), NOx and NH3 undergo a catalytic reduction reaction within the catalyst micropores, generating N2 and H2O, thus achieving efficient NOx removal. Dry technology originates from the LILAC method abroad, using highly active lime-fly ash compounds to absorb sulfur and nitrogen oxides in the flue gas. It does not generate a large amount of waste, but its operating efficiency is relatively low.

VOCs Treatment Technologies For volatile organic compounds (VOCs) in precipitated silica waste gas, the following treatment technologies are mainly adopted:

Activated Carbon Adsorption: Suitable for low-concentration VOCs waste gas, utilizing the adsorption capacity of activated carbon to purify the waste gas.

Catalytic Combustion (RCO): Suitable for high-concentration VOCs waste gas, using a catalyst to oxidize and decompose organic matter into CO₂ and H₂O.

Biofilter: Utilizes microorganisms to degrade organic waste gas, suitable for biodegradable VOCs.
Activated Carbon Adsorption-Desorption Catalytic Combustion Device: Integrates adsorption, desorption, and catalytic combustion, retaining the advantages of activated carbon adsorption—simple equipment and low investment—while solving the problems of activated carbon regeneration and final VOCs disposal through catalytic combustion. The concentration of organic matter in the waste gas entering the adsorption device should be below 25% of its lower explosive limit. If the concentration of organic matter in the waste gas is above 25% of its lower explosive limit, it should be reduced to 25% of its lower explosive limit before adsorption purification.