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About pentoxide vanadium state of the art 1, Adding salt roasting and vanadium extraction technology and salt roasting and vanadium extraction technology (industrial salt addition amount 8-15%) belongs to the backward technology of elimination and shutdown in the early 1990s. The main problems are serious air pollution and inorganic salts in wastewater. High content. In the 1990s, some companies adopted a low-salt roasting vanadium extraction technology (5-6% industrial salt addition) to reduce the amount of salt added, but it did not effectively solve the environmental pollution drawbacks of the salt-adding vanadium extraction technology. The inorganic salt content is high, the wastewater recycling rate is low, and a large amount of discharged wastewater is generated in the production process, causing serious environmental disputes in the surrounding areas of the enterprise! At present, there are provinces in China that have stone and vanadium extraction industries. Most of the newly-built enterprises adopt industrial policies that prohibit the use of salt-adding (including low-salt) roasting and vanadium extraction technologies, such as Henan, Hubei, Chongqing, Shaanxi, Xinjiang, and Guizhou. 2, Salt-free roasting and vanadium extraction technology (blank roasting technology) The early nineties, Hunan Institute of coal-related companies to develop joint research without salt roasting vanadium extraction technology (do not add any additives), currently only uses the technology in individual enterprises Huaihua, the total yield of vanadium ore in Between 38-45%, after technical improvement, the yield has increased. The technology has strong selectivity for ore, and the yield is low, and it does not have industrialized promotion value. 3, Strong acid leaching vanadium extraction technology (wet method for vanadium extraction) Strong acid leaching techniques include strong acid leaching techniques after ore pre-baking and non-roasting strong acid leaching techniques. The technology is mainly developed by the Nuclear Industry Corporation Beijing Research Institute of Chemical Metallurgy. Non-calcined strong acid leaching vanadium extraction technology (wet method vanadium extraction technology) Although the ore does not need the roasting process advantages, but the acid dosage is large, the investment is large (the equipment is seriously corroded), the production cost is high, the wastewater and the waste residue are difficult to be treated (waste water, waste residue) The content of inorganic salts is high, the economy is poor, and there is certain selectivity for ore. Industrialization has certain limitations. 4, Other technical improvements The multi-component composite roasting additive used in the roasting process, the multi-component composite leaching agent used in the leaching process, etc., are only a modification of the process, and have certain limitations, and are not new technology and new technology. category.
Nox Sensor 12V For VW Car,Automotive engine parts Volkswagen 12V nitrogen and oxygen sensor is suitable for Volkswagen exhaust treatment. Nitrogen and oxygen sensor is one of the key components of SCR post-treatment system. It is used to measure the concentration of nitrogen and oxygen in engine exhaust to meet the needs of closed-loop control of engine aftertreatment system and on-board OBD diagnostic system. It can be applied to gas engine or diesel engine. Its structure includes ceramic probe, cable and processing chip controller, which is connected with ECU through can communication. The effects of nitrogen and oxygen sensor damage are as follows: 1. If the nitrogen and oxygen sensor is damaged, the diesel control system is in an open-loop state, that is, the emission data cannot be accurately fed back, and the engine control unit cannot accurately adjust the emission. At this time, the vehicle's emission must exceed the standard. If it always exceeds the standard, the service life of tail gas emission treatment equipment will be shortened. 2. Because it is a key component for measuring the excessive exhaust of diesel vehicles. If it is damaged or works poorly, it will directly cause multiple fault lights of the engine to turn on. At the same time, there will be relevant fault storage records in the control unit. 3. The damage of nitrogen and oxygen sensor will lead to the disorder of diesel combustion control, resulting in weak acceleration, idle jitter, unable to start and so on,. Once a problem occurs, the nitrogen and oxygen sensor needs to be replaced in time. It is usually installed at the rear end of the catalyst in the exhaust pipe.
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