The environmental protection measures during the production of ferric pyrophosphate mainly cover the following aspects:
Air Pollution Prevention and Control Measures
Dust Removal: High-efficiency dust collection equipment, such as bag filters, can be used to collect and treat dust generated during ferric pyrophosphate production, reducing the concentration of particulate matter in exhaust gas.
Nitrogen Oxide (NOₓ) Reduction: For process links that may generate nitrogen oxides, denitrification technologies like Selective Catalytic Reduction (SCR) or Selective Non-Catalytic Reduction (SNCR) can be adopted to reduce NOₓ emissions. Meanwhile, low-nitrogen combustion technology is applied to minimize NOₓ formation during fuel combustion.
Acid-containing and Volatile Organic Exhaust Treatment: Exhaust gases such as those from acid leaching and raw material storage tank breathing can be treated using devices with processes like "ferrous chloride solution absorption + alkaline solution scrubbing absorption" to ensure emissions meet standard limits.
Water Pollution Prevention and Control Measures
A comprehensive wastewater treatment system should be established to classify and treat production wastewater:
Washing Water Treatment: Washing water is adjusted to an appropriate pH level by adding ammonia water, then filtered and concentrated via reverse osmosis (RO) membranes. The treated fresh water can be directly reused or further processed for reuse.
Mother Liquor Treatment: Mother liquor undergoes a series of processes in sequence, including fluoride removal, phosphorus removal, manganese removal, calcium sulfate production, calcium and magnesium removal, and ammonia removal. Corresponding reagents (e.g., fluoride removers, ferric sulfate, oxidants, calcium oxide or calcium hydroxide slurry) are added to remove impurities from the mother liquor. By-products such as ferric phosphate, manganese dioxide, and calcium sulfate are recovered during the process. After ammonia removal, the wastewater is concentrated by RO membranes and recycled, achieving zero discharge of wastewater.
Soil Pollution Prevention and Control Measures
Seepage Prevention: Key anti-seepage measures are implemented in areas prone to pollutant leakage, such as raw material transportation pipelines, production workshops, tank farms, and sewage transportation pipelines, to prevent harmful substances from seeping into the soil.
Operational Management: Strengthen production management by conducting regular inspections of equipment and pipeline tightness. Promptly detect and address issues like leakage or spillage to avoid soil contamination.
Solid Waste Treatment Measures
Solid waste generated during ferric pyrophosphate production is collected and treated by classification:
Carbon Residue and Filter Residue: After entrusting professional institutions to identify their properties, these wastes are managed in accordance with laws based on the identification results. Before the identification results are released, they are managed as hazardous waste.
Waste RO Membranes: These are sent back to equipment manufacturers for recycling and treatment.
Waste Packaging Materials: These are handed over to material companies for recycling and reuse.
Laboratory Waste and Waste Oil: These are entrusted to qualified units for treatment.
Domestic Waste: This is uniformly collected and transported by environmental sanitation departments.
Other Environmental Protection Measures
System and Institutional Construction: Develop a comprehensive environmental management system before starting ferric pyrophosphate production, establish a dedicated environmental management agency, and strengthen the operation management, maintenance, and overhaul of environmental protection facilities to ensure their normal operation and compliance of pollutant emissions with standards.
Energy Conservation and Circular Economy: Enhance energy management by conducting energy audits and implementing energy-saving transformations to improve energy utilization efficiency and reduce energy consumption per unit of product. Promote the circular economy model to realize resource utilization of waste.
