Purification process for pure niobium

Abstract

The invention discloses a purification process for pure niobium. A microcomputer on-line monitoring system is adopted. The guarantee level of the process by equipment is greatly improved. The content of impurities in niobium oxide is further lowered, the high-melting-point niobium is melted and precipitated to the bottom of a reactor through heat emitted out of an aluminothermic reduction reaction, and purification is performed again by means of electron-beam smelting so that smelted niobium with high purity can be obtained. In addition, low-melting-point metal impurities can be effectively removed through refining; a large-grained niobium ingot obtained after electron-beam smelting is directly cut into large-grained niobium pieces, and then the surfaces of the niobium pieces are subjected to chemical treatment; the steps that the large-grained niobium ingot is cogged, annealed and the like to be made into small-grained niobium plates at first and then electrochemical polishing is conducted in a traditional manufacturing technique process are omitted, and processing pollution is avoided; and moreover, the RRR value of the prepared niobium pieces is equal to that of the ingot, the superconducting property is improved, and the accelerating gradient and performance are made higher.

Description

technical field [0001] The invention relates to a process for purifying pure niobium, belonging to the technical field of niobium purification. Background technique [0002] Niobium is a rare and precious metal. It is widely used in steel, electronics, etc. due to its high melting point, good corrosion resistance, good processing performance, small thermal neutron capture cross section, good thermal conductivity, high emission performance and gas absorption performance. In recent years, the rapid development of information industry and microelectronics technology and the continuous growth of demand for high-value steel products have provided excellent opportunities for the development of hydrometallurgy; but At the same time, there are problems such as serious fluorine pollution and low decomposition rate of low-grade tantalum-niobium ore in the current process, which increasingly restrict the development of hydrometallurgy; and in the process of purifying niobium, the react...

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Problems solved by technology

[0002] Niobium is a rare and precious metal. It is widely used in steel, electronics, etc. due to its high melting point, good corrosion resistance, good processing performance, small thermal neutron capture cross section, good thermal conductivity, high emission performance and gas absorption performance. In recent years, the rapid development of information industry and microelectronics technology and the continuous growth of demand for high-value steel products have provided excellent opportunities for the development of hydrometallurgy; but At the same time, there are problems such as serious fluorine pollution and low decomposition rate of low-grade tantalum-niobium ore in the current process, which increasingly restrict the development of hydrometallurgy; and in the process of purifying niobium, the reaction conditions are not ideal and the process steps are not rigorous. and other problems, resulting in that the purity of niobium is not too high, contains more impurities, and the purification cost is also high, the work efficiency is low, and it does not meet the actual production requirements.