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According to reports, the new process has achieved continuous production and operation. After testing by related departments, the efficiency of the purification of sulfuric acid mist and sulfur dioxide in the exhaust gas has reached 99.9%, and the purification efficiency of fluoride has reached 99.99%, far lower than the national emission standards. The new process also recovered hydrofluoric acid and sulfuric acid, reduced the consumption of lime and magnesium oxide and water consumption, and reduced a large amount of industrial waste water and waste residue. This not only saved the cost of sewage discharge, but also enabled the company to remove the hats of large polluters.
Concentrated sulfuric acid treatment of rare earth concentrate tail gas purification process is to let the concentrated sulfuric acid roasting exhaust gas through the Venturi cooling dust collector, so that most of the exhaust gas sulfuric acid mist, sulfur trioxide, hydrogen fluoride is absorbed, while reducing the exhaust temperature. Then through the third-stage absorption tower, it continues to absorb the hydrofluoric acid and sulfuric acid mist in the tail gas. The exhaust gas is then subjected to the fourth-stage sulfur removal, and finally enters the electric defogger to remove residual sulfuric acid mist. The purified exhaust gas passes through the fan and is 65 meters high. The exhaust cylinder is discharged into the atmosphere.
According to reports, Baotou Bayan Obo rare earth ore is not only the world's largest rare earth mine, but also the most complex mineral composition of rare earth ore. Rare earth minerals are not only complex with iron, strontium, barium and other polymetallic minerals, but are themselves mainly composed of lanthanum tantalum ore and monazite. Even if they are separated from non-rare earth minerals such as iron ore, they can only be obtained in production. Mixed rare earth ore. It is more difficult to treat this rare earth concentrate than to treat a single type of fluorocarbon antimony concentrate. At present, the most commonly used decomposition treatment process in production is the concentrated sulfuric acid roasting method, which has the advantages of strong applicability, easy separation of impurities, and low production cost, but there is always an acidic tail gas containing fluorine and sulfur that seriously pollutes the atmosphere and absorbs waste water. Standards and other issues have become environmental problems that have plagued rare earth production. Rare-earth enterprises have long used it as a key technology target.
Baotou Hongtianyu Rare Earth Factory is a company that uses concentrated sulfuric acid to process rare earth concentrates in Baotou to produce mixed rare earth carbonates. In order to completely solve the problem of rare earth concentrate tail gas, the plant has carried out several times of mixed carbonated rare earth production line processes and equipment for more than a decade. The transformation finally succeeded in overcoming the problems of tail gas and wastewater treatment that plague rare earth companies.
New exhaust gas purification technology allows new rare earth companies
Valuable element recovery and exhaust gas meet the standard emission. The new process named sulfuric acid rare earth concentrate tail gas purification treatment will enable the rare earth concentrate to realize the recovery of valuable elements and achieve the discharge of exhaust gas at the same time. The reporter learned from the relevant departments of Baotou City on January 16 that this new technology developed successfully by Baotou Hongtianyu Rare Earth Plant over the past 10 years has passed the environmental protection acceptance of the Inner Mongolia Autonomous Region.