For metal castings, the commonly used surface treatment methods are mechanical grinding, chemical treatment, surface heat treatment and spraying surface. Surface treatment is to clean, sweep, deburr, degrease and deoxidize the surface of the workpiece.In the process of processing, transportation and storage of the workpiece, the surface is often with oxide scale, rust mold residual molding sand, welding slag, dust and oil and other dirt.To coating can firmly adhere to the surface of workpiece, the workpiece surface before coating must be clean, otherwise, not only influence the adhesion and corrosion resistance of coating and metal, but also can make the matrix metal under even with protective coating can also continue to corrosion, the coating peeling, affect the mechanical properties and service life of the workpiece.Therefore, the surface treatment of the workpiece before painting is an important guarantee and measure to obtain a good quality protection layer and extend the service life of the product. Surface Treatment Production Line Powder Coating Line,Powder Spraying Machine,Surface Treatment Production Line,Electrostatic Powder Spraying Equipment Foshan Youngmax Machine Co.LTD , https://www.ymaxmachine.com
In 2003, the former State Environmental Protection Administration fully initiated the formulation of national standards for the discharge of pollutants from the pesticide industry. To facilitate the formulation and implementation of emission standards, according to the chemical structure of pesticides, organic phosphorus, pyrethroids, carbamates, amides, organic sulfurs, phenoxy carboxylic acids, sulfonylureas, heterocyclics, 10 categories, including biological and organochlorine, formulated the standards for the discharge of water pollutants from the pesticide industry. Among them, the “Discharge Standard for Water Pollutants of Heterocyclic Pesticide Industry†was released on April 2 this year; the organic phosphorus pesticides emission standards have been submitted for review and are ready for administrative review; pyrethroids and sulfonylurea pesticides Emission standards have completed the solicitation process; organic sulfur and organic chlorine pesticides are being widely consulted throughout the country; benzene oxide carboxylic acid and amide pesticides are about to enter the comment process.
According to the Director of Science and Technology Standards Division of the Ministry of Environmental Protection, Mr. Zhou Fengbao disclosed that there are more than 2,600 pesticide companies in China and discharge more than 100 million tons of wastewater every year. Among them, only 7% of the total amount has been regulated, and only 1% of the treatment has been dealt with, which has a serious impact on the ecological environment. For a long time, the discharge of pollutants from pesticide manufacturing enterprises in China's pesticide industry has been implementing comprehensive pollutant discharge standards. It is poorly targeted and lacks the control indicators for the emission of characteristic pollutants from pesticide production companies. The classification of the development of targeted sewage standards will greatly reduce the environmental pollution. Taking the “Hydrocycle Pesticide Industrial Water Pollutant Emission Standards†as an example, due to strong pertinence, the annual COD emissions of six kinds of heterocyclic pesticides are 28,125 tons. After the standard is implemented, 27383 tons of emissions will be reduced annually, and the reduction rate will reach 97.4%. . After all the standards for the discharge of water pollutants from the 10 categories of pesticides have been completed and implemented, the pollutant discharge of pesticides in China will be greatly improved.
Luo Haizhang, chairman of the China Pesticide Industry Association, believes that at present, the pesticide industry is in a critical stage of energy conservation and emission reduction. Pesticide companies should improve their technological level and eliminate the “three wastes†in the process as much as possible to enhance the overall image of the industry.
China has stepped up efforts to improve the national standard system for pesticides
On July 1, the “Discharge Standard for Water Pollutants of Heterocyclic Pesticide Industry†will be formally implemented. The promotion and implementation of this standard will end the long history of China's pesticide industry without national standards for pollutant discharge, marking the prevention and control of pesticide industry pollution in China. Work enters a new phase. In addition, the discharge standards for benzene oxides and amides pesticide industrial water pollutants have been drafted. At this point, China has eight categories of pesticides that have official or draft standards for the discharge of water pollutants. This is the information obtained by the reporter on June 27 from the National Pesticide Industry Environmental Protection and Safety Technology Exchange Conference held in Yangzhou.