Pollution and treatment in the production of magnesia refractories

The pollution sources and pollutants produced in the production of magnesia refractories mainly include: production of dust; kiln discharge of soot, sulfur dioxide, nitrogen oxides, carbon monoxide, etc.; phenolic resin, asphalt, paraffin and other binders emit formaldehyde under heating conditions, Harmful gases such as bituminous flue gas, paraffin vapor (heterocyclic compound); noise generated by various equipment, air compressors, fans and various pumps; equipment cooling water, circulating water drainage, flushing workshop floor wastewater and domestic sewage, etc. Waste water; solid waste discharged from dust collectors, product processing equipment, furnaces and living facilities. The waste magnesia chrome brick recovered from the cement kiln contains hexavalent chromium which is toxic, soluble in water, and potentially contaminated groundwater.