Farmland is polluted by heavy metals

On the 28th of last month, 9 ministries and commissions such as the Ministry of Environmental Protection jointly held the 2011 National Environmental Protection Transformation Action Conference and this year's special action focused on the "Sword and Finger" heavy metal pollution problem. Among them, the rectification of lead battery enterprises has become the top priority for China's environmental protection action this year.

According to the data released by the Ministry of Land and Resources, environmental protection experts estimate that the amount of food polluted by heavy metals in China is as high as 12 million tons each year, equivalent to the total grain output of Guangdong in a year, and can support 40 million people who live in the Pearl River Delta.

According to the Minister of Environmental Protection Minister Zhou Shengxian, according to the “Twelve Five Year Plan” of the “Comprehensive Prevention and Control of Heavy Metal Pollution,” by 2015, the discharge of heavy metal pollutants such as lead, mercury, chromium, cadmium, and metalloid arsenic in key areas was reduced compared to 2007. 15%, and require all localities to comprehensively launch the "Twelfth Five-Year Plan" for comprehensive prevention and control of heavy metal pollution, and lay a solid battle against the comprehensive prevention and control of heavy metal pollution.

According to the "Comprehensive Prevention Plan for Heavy Metal Pollution in the Battery Industry" of the Ministry of Industry and Information Technology, the heavy metal consumption of the battery industry is high, and the risk of heavy metal pollution in the production, recycling, and recycling sectors is high. Mercury-containing button batteries, mercury-containing zinc-manganese batteries, and nickel-cadmium batteries are disposed of as ordinary garbage after disposal, and there are hidden dangers of heavy metal pollution.

Double Disc Grinding And Polishing Machine

Grinding and polishing are the same mechanical movement, the principle is the same. But for surface quality, the surface finish of polishing is higher than that of grinding. In fact, polishing fluid can be said to be the last process of grinding, grinding and polishing can be realized on the same plane polishing machine at the same time. Grinding is divided into rough grinding, fine grinding, polishing is divided into rough throwing, fine throwing. Most of the time, we have three processes to process the surface quality of products: rough grinding, fine grinding, fine polishing. With these three processes, the workpiece surface flatness, parallelism, roughness is quite high. Some customers do not have such high accuracy requirements, especially roughness requirements are not so high, so they only use the first two processes, or the fine grinding process. Specific to see the quality of the workpiece surface itself, as well as customer requirements to achieve the quality.

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