Method for enriching niobium by high-temperature roasting and low-intensity magnetic separation

A technology of high-temperature roasting and weak magnetic separation, applied in chemical instruments and methods, magnetic separation, solid separation, etc., to achieve the effects of simple equipment, reduced emissions, and improved efficiency

Inactive Publication Date: 2015-04-08
包钢集团矿山研究院(有限责任公司)
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Problems solved by technology

[0003] At present, Baotou Steel can select niobium concentrate with niobium grade greater than 5% and iron grade greater than 40% after sorting, and then through "solid reduction of iron-high temperature The low-grade ferroniobium with a niobium content of 15-20% is obtained by the method of melting and smelting. This method has high energy consumption, serious pollution and high cost.

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  • Method for enriching niobium by high-temperature roasting and low-intensity magnetic separation
  • Method for enriching niobium by high-temperature roasting and low-intensity magnetic separation
  • Method for enriching niobium by high-temperature roasting and low-intensity magnetic separation

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[0025] The niobium concentrate is gradually processed under the process conditions given in the "high-temperature roasting-weak magnetic separation" method.

[0026] The niobium concentrate in this example comes from the niobium concentrate selected in the "Baiyun Obo Tailings Comprehensive Utilization" project.

[0027] Table 1 shows the multi-element analysis of niobium concentrate (mass percentage)

[0028]

[0029] Using the solid-state reduction method, the coke is mixed with 90% of the total amount of minerals. The TFe content in the niobium concentrate is 43.5%, Nb 2 O 5 The content is 5.75%, heated in a muffle furnace, the heating time is calculated according to the quality of the mineral, is 10min / g, the temperature is 1200℃, and the TFe content is 51.06%, Nb after roasting 2 O 5 Reduced niobium concentrate with a content of 6.74%.

[0030] The reduced niobium concentrate is ground to a 200-mesh content of 70%, and magnetically separated in a weak magnetic tube with a magnetic...

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Abstract

The invention relates to a method for enriching niobium by high-temperature roasting and low-intensity magnetic separation and belongs to the technical field of mineral extraction metallurgy. The method comprises the following steps: performing solid-state reduction of a niobium ore concentrate to obtain a reduced ore containing the niobium and metal iron; ball-milling the reduced ore containing the niobium and the metal iron and then performing low-intensity magnetic separation to obtain a niobium-rich material. According to the method disclosed by the invention, iron oxide in the niobium ore concentration is selectively reduced in a solid state, so that the metal transformation rate is above 90%; by reduction of the iron oxide, a mineral structure of niobium-iron rutile in the original ore is damaged; subsequently niobium oxide can be separated from the metal iron by low-intensity magnetic separation; finally the content of iron in the obtained niobium-rich material is lower than 8%; compared with the original 'solid-state iron reduction-high-temperature melt separation-smelting' method, the method disclosed by the invention can be used for preparing the niobium-rich material of which the iron content is basically the same and also has the advantages of saving power consumption, reducing emission and improving the efficiency.

Description

technical field [0001] The invention relates to a high-temperature roasting-weak magnetic separation enrichment method for niobium, which belongs to the technical field of mineral extraction and metallurgy. Background technique [0002] Niobium is a rare metal with a high melting point. It has high temperature resistance and corrosion resistance. In addition, it has good thermal conductivity, plasticity, machinability and unique electrical properties. Significantly improve the performance of the added object. Therefore, niobium has become an indispensable important metal material in modern industry and cutting-edge technology. It is widely used in steel, petrochemical, aerospace, nuclear industry, information engineering and ocean engineering, as well as electronics, electrical appliances, Superconducting, laser, medical and other fields. Niobium new materials in military industry, nuclear energy, aerospace and other fields have attracted the attention of the world, so the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/24C22B1/02B03C1/30
Inventor 梁文京李宏静杜国萍钱淑慧贾中帅王丽明周鑫贾佳
Owner 包钢集团矿山研究院(有限责任公司)
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