Introduction to the status quo of vanadium pentoxide technology

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.

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