Faced with resource constraints and environmental pressures, the white carbon black industry is building a closed-loop system of "raw materials products waste":


Comprehensive utilization of rice husk ash: The direct calcination method developed by Liu Houfan's team involves boiling rice husks in 3% hydrochloric acid for 4 hours and calcining them at 550 ℃ to produce white carbon black with a whiteness of over 93% and a silicon dioxide content of 98%. Activated carbon is also produced simultaneously.
Fluorosilicic acid resource utilization: Using fluorosilicic acid, a by-product of the phosphate fertilizer industry, as raw material, white carbon black is produced through ammonification and soda ash methods. Each ton of product can reduce fluoride emissions by 1.2 tons and reduce production costs by 20%.
Zero discharge of wastewater: Membrane bioreactor (MBR) is used to treat precipitation wastewater, and the recovered sodium sulfate can be used for glass manufacturing, with a water recycling rate of 95%.
At the policy level, China's "14th Five Year Plan for Industrial Green Development" clearly requires the proportion of clean production in the white carbon black industry to exceed 80%, promoting the industry's transformation towards low carbonization and recycling.