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1. Newly built, expanded and reconstructed caustic soda devices should strive to adopt the ion membrane method. It is forbidden to build a caustic soda production device with an annual output of 10,000 tons or less.
2. In the production of caustic soda, wash salt should be actively used instead of raw salt as raw material, so that the amount of salt sludge produced is reduced from 40-50 kg per ton of caustic soda to 15-20 kg.
3. The salt refining process was reformed and the salt mud was treated with multiple washings, sedimentation and pressure filtration to reduce the NaC1 content in the salt sludge to 1-2 g/L. The washing water is reused in the salting process, and the salt mud is comprehensively used or properly stored.
4. The existing diaphragm method is used to produce asbestos waste water discharged from caustic soda equipment. Gravity sedimentation, vacuum suction filtration, or centrifugal filtration is used to maximize the recovery of asbestos velvet, and the asbestos lining in waste water is reduced from 3-8 g/L to 0. 2-0.3g/L.
5. Newly built and expanded PVC plants should be located as close as possible to the place of production of ethylene, or economically viable, dichloroethane, and vinyl chloride should be used. Ethylene oxychlorination should be used. Areas where electricity prices are cheap can adapt to market competition and acetylene can also be used.
6. The construction of open electric furnaces and calcium carbide furnaces with an annual output of 10,000 tons or less is prohibited.
7. Newly-built or expanded closed-type calcium carbide furnaces must employ advanced technologies and equipment such as furnace gas purification and dry-type dust removal, and be equipped with a built-in residual heat utilization device to prevent dust and furnace gas pollution.
8. Existing large-scale open type calcium carbide furnaces should be fully converted into closed type calcium carbide furnaces by 2005, using domestic mature gas purification and dry dedusting technologies, recycling furnace gas as fuel or comprehensive utilization of waste heat.
9. Acetylene production of vinyl chloride wastewater containing mercury, iron scrap reduction method and activated carbon adsorption method to eliminate mercury pollution, mercury concentration after treatment to meet the national emission standards, pass rate to reach 100%.
10. Treatment of calcium carbide wastewater uses oxidation or recycling back to usage. After treatment, the wastewater is reused for production; after the calcium carbide slag is dehydrated, it is sent to the rotary kiln for calcining lime, which is used for calcium carbide production, or used as cement and other building materials.
11. In the process of vinyl chloride distillation, the top of the tower discharges high concentrations of VCM (up to 30%-50%), and the activated carbon fiber is used for adsorption recovery, so that the VCM content in the treated exhaust gas meets the national emission standards.
12. The three-stage absorption process for the production of synthetic hydrochloric acid is promoted to cure acidic wastewater.
13. The use of precipitation, flocculation, absorption, incineration, biochemical treatment and other methods to treat "three wastes" such as carbon tetrafluoride, ferric chloride, chloroform and other serious pollution products. (Xinhua News Agency)
The Chlor-alkali Industry Environmental Protection Technology and Measures during the Tenth Five-year Plan Period in China
Xinhua News Agency information, environmental protection technologies and measures that China's chlor-alkali industry should adopt during the 10th Five-Year Plan Period: