The calcium carbide method PVC mercury pollution prevention and control program was issued

On June 4th, the Ministry of Industry and Information Technology announced the “Notice of the Integrated Mercury Pollution Prevention and Control Plan for the Pyro-Chemical Industry of PVC Industry in India”, marking the official introduction of the “Comprehensive Mercury Pollution Prevention and Control Plan of the Calcium Carbide Process PVC Industry”. The "Notice" also released the "Keystone Cleaner Production Technology for PVC Industry" in the form of an attachment.

The "Programme" pointed out that the UN Environment Programme is currently studying the development of international conventions that limit the circulation of mercury and the implementation of mercury reduction. China's calcium carbide process PVC industry accounted for about 60% of the total use of mercury in the country, which determines that the calcium carbide process polyvinyl chloride industry will become the most important areas for the implementation of China's mercury convention in the future.

At present, the mercury of China's calcium carbide process PVC production process is mainly spent mercury catalyst, mercury-containing waste activated carbon, mercury-containing waste **, spent lye, etc., accounting for 36%, 8% of the total use of ***, respectively. 51%, 5%. Waste mercury catalyst and waste mercury activated carbon are recovered and treated by qualified hazardous waste treatment plants, and the recovery rate is about 75%. However, only 20% of mercury-containing waste effluent and spent lye are subjected to deep desorption. Most of the harmless treatment of mercury has not been properly disposed of.

According to the “Programme”, by 2012, China's calcium carbide PVC industry penetration rate of low mercury catalyst reached 50%, with an average of 25% per ton of PVC use, the entire industry to achieve a reasonable recovery of waste mercury catalyst; ** The penetration rate of deep desorption technology has reached more than 50%. By 2015, all industries will use low-mercury catalysts, the use of PVC per metric ton will be reduced by 50%, the recovery of waste low-mercury catalysts will reach 100%, and the penetration rate of high-efficiency mercury recovery technology will reach 50%; Suspension technology penetration rate of more than 90%; using * sodium hydride treatment of mercury-containing wastewater (including waste **, spent lye, etc.) penetration rate of 100%.

In the “Keystone Cleaner Production Technology for the Calcium Carbide Process PVC Industry”, low-mercury catalyst, ** desorption technology and * sodium hydride treatment *** technology are listed as the promotion technology category; the oxygen-controlled dry distillation process recovers spent catalyst *** New technologies for activated carbon and high-efficiency mercury recovery technologies are listed as application demonstrations; Molecular Sieve Hg catalysts, mercury-free catalysts, and vinyl chloride fluidized bed reactor technologies are listed as R&D technologies.