Mentioned In The Silt From The Yangtze River Three Gorges Tail (chongqing), Scandium Pilot Study

Yangtsc River is the mother of our Chinese, while the Three Canyon Dam is a great engineering in the world. Since the Dam was founded, the stage of Yangtse River at Chong Qing became the end of the reservoir, where amount of silt sediment yearly. The great amount of silt not only brought great trouble to the transport of the Yangtse River, but also brought into the problem of environment pollution. Therefore, the comprehensive treatment to the silt of the stage of Yangtse River at Chong Qing becomes a impending problem.Through studying to the silt of the end of the reservoir, we found that the silt is a matter with high silicon, calcium and magnesium, which also contains the rare metal Scandium. Because the metal of Scandium has many good physical and chemical characters, it is used in many fields, such as national technology, metallurgy, chemical combination, glass, spaceflight, nuclear technology, laser, electron, light lamp-house of computer, superconduct and medical treatment. In the silt, the grade of Scandium is 6.6 gram per ton. Through the economy budget, if these Scandium were picked-up, it will bring great benefit to the society, while the problem of the silt sedimentation is solved.In this dissertation, test of reclaim Scandium from the silt was studied. Through studying to the silt, we found the element of Scandium lies mainly in the minerals of ilmenite and titanaugite. On the basis of the difference of their characters of gravity, the tailings can be thrown away by spiral concentrators and spiral chute. Therefore the Scandium concentrate was got. Through a series of mineral separation processing, grinding-magnetic-electric, the grade of Scandium was highly raised. On the basis of the small test, the half-industry and product-type experiment was studied. As the result, the grade of Scandium reached 96.23g/t and the recovery reached 62.11%. At the same time, the iron concentrate with grade of 54.21% was gained. To enrichment the Scandium, the technology of leaching-extraction-stripping was studied, from which we got the oxide scandium. Through reduction at high temperature, the metal Scandium was gained. All of these proved the mineral processing flow is reasonable. The tailings of the mineral processing can be used of sands of buildings.Test of disposal and comprehensive to the tailings, leaching residue and oliquid waste was studied as well, accordingly, the clean entironment was insured, which measures up the modern mill run.