The business scope includes general business projects: industrial wastewater, waste gas, noise treatment projects; Domestic trade; Import and export of goods and technology. technical consultation on resource recycling services; technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; environmental consulting services; Energy contract management. precious metal smelting; sales of metallurgical special equipment; manufacturing of special equipment for environmental protection; sales of special equipment for environmental protection; general machinery and equipment installation services; mechanical and electrical equipment manufacturing; sales of mechanical and electrical equipment; repair of electrical equipment; instrument manufacturing; Engineering and technology research and experimental development. (Except for projects subject to approval in accordance with the law, independently carry out business activities according to law with a business license), the licensed business projects are: technology development, production and sales of environmental protection equipment and precious metal refining equipment