Producing nitric acid plant in Chengdu PAX Metallurgy and Technology Co., Ltd. developed a new type of nitrogen oxide gas denitrification attached governance denitrification subsidiary production of nitric acid technology has obtained national patent (Patent No.: 201220021181.2), has the following characteristics: 1, especially for high concentrations of nitrogen oxide gas treatment, from hundreds to hundreds of thousands of mg / Nm3. The process gas temperature is not limited. 2, thorough governance, governance can achieve the emission requirements of GB (100 to 200mg/Nm3) time. 3, the process gas unrestricted regardless of gas size can be implemented. 4 subsidiary production of low concentration of nitric acid (20 to 30%), environmental governance and the economic benefits. 5, the processing cost is very low, a wide range of sources of raw materials and cheap (only with air, water, electricity). 100% nitric acid per ton cost less than $ 400. 6, state-of-the-art technology: the combination of oxidation absorption plus reduction treatment. The system has a high degree of automation, extremely reliable operation, saving labor. 7, the company has a hour nitrogen oxide gas handling capacity of 1000m3 accompanied by producing nitric acid unit available for customer inspection visit. Customers using this technology and denitration device for the State Environmental Protection Fund to support and lay a solid foundation. The denitrification of subsidiary production of nitric acid plant widely applicable to the industry: 1, leaching with nitric acid industry (tungsten, molybdenum vanadium copper nickel gold and silver, etc.); 2, inorganic chemical industry; the organic chemical nitrification industry; 4, stainless steel pickling industry ; 5, polysilicon pickling industry; 6, nitric acid leaching of precious metals industry. Users are welcome to advisory missions to visit the guidance, cooperation and win-win.