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A method for preparing ferroniobium alloy by electrolysis of niobium concentrate molten oxide

A technology of molten oxide and niobium-iron alloy, which is applied in the fields of chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problem that the resources of niobium in Baiyun Obo have not been effectively recycled, the process of hydrometallurgy is complicated, and the impurities do not meet the requirements of smelting. Steel requirements and other issues, to achieve the effect of green metallurgy, lower temperature, and low cost

Inactive Publication Date: 2016-01-20
SHANGHAI UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] However, due to the complicated process of hydrometallurgy, the smelting cycle of pyrometallurgical niobium extraction is long, the product cost is high, the product quality is low, and the impurities do not meet the requirements of steelmaking
At present, there are deficiencies in various niobium extraction processes for comprehensive utilization of Baotou Iron and Steel tailings, and Baiyun Obo niobium resources have not been effectively recycled. Niobium component, and effective use of other valuable metal components

Method used

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  • A method for preparing ferroniobium alloy by electrolysis of niobium concentrate molten oxide

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Embodiment 1

[0025] A method for preparing ferroniobium alloy by electrolysis of niobium concentrate molten oxide, the flow chart of which is as follows figure 1 As shown, the process and steps are as follows:

[0026] The composition of the niobium concentrate set in the present embodiment is roughly as follows: Nb 2 o 3 ≤5%, TFe≤45%, REO≤3%, CaO≤15%, Al 2 o 3 ≤10%, MgO≤5%, SiO 2 ≤15%, other ≤5%;

[0027] Selective reduction and magnetic separation of niobium concentrate: using H 2 The gas reducing agent reduces the iron oxides in the solid niobium concentrate powder at 1200°C, the reduction time is 0.5 hours, the reduced mixture is pulverized, and separated by magnetic separation to obtain pure iron powder and rich niobium and rare earth A mixture wherein the niobium-iron ratio in the niobium-rich and rare earth mixture is 0.15;

[0028] Preparation of niobium-iron alloy by molten salt electrolysis: Melt niobium-rich and rare earth mixture at 1550°C, use high-melting-point Pt meta...

Embodiment 2

[0030] Selective reduction and magnetic separation of niobium concentrate: Use CO gas reducing agent to reduce the iron oxide in solid niobium concentrate powder at 1000°C, the reduction time is 1 hour, pulverize the reduced mixture, and use magnetic separation separation method to obtain pure iron powder and niobium-rich and rare earth mixture, wherein the niobium-iron ratio in the niobium-rich and rare earth mixture is 0.25;

[0031] Preparation of niobium-iron alloy by molten salt electrolysis: at 1450°C, melt the niobium-rich and rare earth mixture, use a high melting point Ir metal electrode, and apply a voltage between the two electrodes in the molten oxide electrolyte for 4 hours; the electrolysis method is pulse current electrolysis , the peak voltage range is 3.5V, the duty cycle is 10.0, and the pulse frequency is 500Hz; CaO and Al are added during electrolysis 2 o 3 Reagents to adjust the molten oxide composition to maintain the mass percentage of CaO in the molten...

Embodiment 3

[0033] Selective reduction and magnetic separation of niobium concentrate: using CO gas with a gas volume of 50% and H with a gas volume of 50% 2 The gas mixed gas reducing agent reduces the iron oxides in the solid niobium concentrate powder at 1000°C, the reduction time is 1.5 hours, the reduced mixture is pulverized, and separated by magnetic separation to obtain pure iron powder and rich Niobium and rare earth mixture, wherein the niobium-iron ratio in the niobium-rich and rare earth mixture is 0.95;

[0034] Preparation of niobium-iron alloy by molten salt electrolysis: Melt niobium-rich and rare earth mixture at 1550°C, use a high-melting point Ir metal electrode, and apply a voltage between the two electrodes in the molten oxide electrolyte for 4 hours; the electrolysis method is constant voltage electrolysis , the voltage range is 3.5V; CaO and Al are added during electrolysis 2 o 3 Reagents to adjust the molten oxide composition to maintain the mass percentage of Ca...

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Abstract

The invention relates to a method for preparing ferroniobium alloy by electrolysis of niobium concentrate molten oxide, which belongs to the technical field of comprehensive resource utilization and alloy preparation. Firstly, selectivity and magnetic separation of niobium concentrate are carried out to separate the iron in it to obtain a niobium-rich and rare earth mixture, and the molten niobium-rich and rare earth mixture is prepared by electrolysis of molten oxide to prepare ferroniobium alloy. The invention realizes selective reduction of niobium concentrate and magnetic separation and electrolysis of molten oxide to prepare ferroniobium alloy at a temperature below 1650°C, which can significantly reduce the temperature of the reactor and reduce energy consumption; control the content of iron elements in the niobium-rich and rare earth mixture, which can be highly efficient Preparation of intermediate and high-grade ferroniobium alloys with high niobium-iron ratios that are difficult to prepare by hydrometallurgy and pyrometallurgy; controllable preparation of ferroniobium can be realized in the process of high-temperature electrochemical electrolysis, and the process is simple and efficient; the whole process has simple equipment and low cost , can realize continuous production, there is no pollution and carbon dioxide emission in the whole process, and realize green metallurgy.

Description

technical field [0001] The invention relates to a method for preparing ferroniobium alloy by electrolysis of niobium concentrate molten oxide, belonging to the technical field of iron and steel metallurgical refining technology. Background technique [0002] Niobium and niobium compounds have the characteristics of high strength, high hardness, high melting point, and very stable properties, and are widely used in high-tech fields such as steel, aerospace, superconductivity, electronics industry, and electromechanical technology. With the advancement of science and technology, the demand for niobium raw materials in various countries is increasing, and the development and utilization of niobium resources is of great significance. [0003] Baotou Baiyun Obo iron-rare earth-niobium and other polymetallic symbiotic ore is not only rich in iron and rare earth, but also rich in niobium resources. It is one of the important strategic resources in my country. It is of great academ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36B03C1/015
Inventor 张捷宇许继芳盛敏奇曾涛万康金永丽李保卫
Owner SHANGHAI UNIV
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