At the Symposium on Techniques and Criteria for the Treatment of Hazardous Waste Melts at Jiande, Hangzhou on October 26, Wang Qi, director of the Expert Committee of the Central Committee of Industry Committee on Solid Waste and Waste Treatment, gave a detailed introduction to the melting technology. Wang Qi pointed out that in all countries in the world, only Japan has put forward technical standards for the melt processing of solid waste, October 26 in Jiande, Hangzhou, China held a national seminar on hazardous waste melting technology and standards, the Central Committee of Industrial Solid Waste and hazardous waste treatment experts Wang Qi, director of the Committee on the melt processing technology goals and standards of use made Related introduction. Wang Qi said that any one of the processing technology is not a panacea, so he explored the scope of application of melting technology. First of all, from the nature analysis, Wang Qi said that the solid wastes are not purely solid forms. The forms we deal with are very complicated, including the solid and semi-solid states, the gas and liquid in the container. Melt processing technology is mainly targeted at solid organic waste, some of the liquid waste will be treated as fuel, gaseous waste, semi-solid waste water treatment does not apply melt technology. Secondly, from the classification analysis of waste sources, Wang Qi said that waste is a loss of the original value of the material, is a by-product of the production process, environmental management and pollution control process generated material. From these three aspects, the loss of the original use value of the material is not suitable for melting technology, melting technology is the main target of processing is the production of some by-products, but the cost of this treatment is very high, the treatment of the main It is based on the substances produced in the process of pollution control, with complicated composition and high processing difficulty, so that it is possible to adopt the high-cost technical treatment. Wang Qi talked about the location of melting treatment technology in solid Waste Management, said the first thing to be clear, solid waste disposal technology in solid waste management positioning. He introduced that according to the law, China mainly uses incineration and landfilling, and two disposal technologies. The goal is to extract substances from solid wastes as raw materials or fuels to return substances to society and continue to provide useful values ​​for social life. The two melting goals are directly incorporated into both incineration and landfill technologies. He introduced that the recently promulgated "General Standard for Identification of Solid Waste (GB34330 2017)" defined "treatment as a means to transform solid wastes into activities suitable for transportation, storage, utilization and disposal through physical, chemical and biological methods . "Therefore, pure melt processing technology can not solve any problem. Melting treatment is processing technology, intermediate processing or pretreatment, the purpose of treatment is to landfill or reuse. The main content of "General Standard for Identification of Solid Waste (GB34330 2017)" is mainly composed of two parts, one is to use the limit of pollutant emission during disposal and the other is to dispose and utilize the technical requirements for waste. Wang Qi said that the purpose of waste disposal is two: one is to be effectively utilized. Processed products to meet the standards of the product can be used in society, life, and will not affect life and health and the environment. Second, proper disposal. The purpose of treatment to meet the disposal, the use of technology waste on the technical requirements. Speaking of melt processing technology, Wang Qi said that the main types of melt processing technology is limited, the main target is to deal with heavy metal material that is harmful to the treatment of inorganic harmful, melting and glassy state is the key technology of melt processing. He introduced, first of all, the melting process from the crystalline phase into the liquid phase, inorganic matter at high temperature will form a liquid phase, melt processing is often handled at high temperatures. Wang Qi said that among the wastes, it is very difficult to decompose all the wastes because of the complicated material composition, different melting points, and the chance of eutectic melting to find the melting point suitable for all wastes. On the other hand, why the formation of heavy metals after melting will not melt out? Wang Qi said that because the melting process occurs in the polymerization reaction. In the melting process, some of the solid waste materials will form a polymer, heavy metals or harmful substances into the polymer, it can not melt out, it is generally plastic curing, glass curing. After the completion of the molten glass-forming physics, Wang Qi further explained that, strictly speaking, glass is not glass, glassy state is amorphous, plastic is a glassy substance. To form a glass body, the cost will be relatively high, in order to form all the waste glass, there will be great difficulties. The formation of the glassy state is possible, the glassy state is amorphous, and its formation must be a polymer. Wang Qi pointed out that it is difficult to apply all the wastes or fly ash at one temperature or one condition to control the melting point of glass formation and melting. Solid waste melting products are mainly two uses: one is landfill, through the technical treatment of waste can achieve the standard into the landfill, melting is just a landfill pretreatment technology. The other is the comprehensive utilization, that is, building materials. Wang Qi introduction, landfill admission and building materials are standards. Landfill admission standards include hazardous waste incineration pollution control standards, flue gas emission standards, etc., to meet the emission of pollutants, melting treatment of flue gas emissions, flue gas emissions to meet the burning of waste incineration standards. But also to meet the standards of building materials, building materials standards are mainly two standards for the production of cement waste, but to produce other building materials, standards are still missing. According to Wang Qi, among the countries in the world, only Japan has put forward technical standards for the melting treatment of solid waste. Relevant laws and regulations were promulgated in 1998, which stipulated that solidified waste materials could be used to produce roadbed materials, concrete aggregates and asphalt aggregates. The import and export of liquid to meet the standard degree of melting, if the incineration fly ash into the residue, after melting can do basic building materials, heavy metal content in the material to meet Japan's drinking water standards, if no one to buy, you can only enter the garbage Landfill, to meet the landfill admission standards. 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