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Method for converting niobium minerals in niobium rough concentrate into niobium ore and producing niobium concentrate

A technology for rough concentrate and sodium niobium ore, which is applied in the fields of metallurgy and mineral processing, can solve the problems of high energy consumption, unfavorable industrial application, low content, etc., and achieves the effects of strong adaptability, favorable industrial application and low energy consumption

Active Publication Date: 2022-07-29
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after its slow crystallization, the slag containing niobium / iron ore phase is dispersed in perovskite to form perovskite ferroniobium intergrowth ore. The coexistence ore phase theory Nb 2 o 5 The content is low, so it is impossible to obtain qualified niobium concentrate
Secondly, the crystal size of niobium minerals is difficult to control, and the niobium-rich slag must be ground to below 30 μm, and after recrystallization, the niobium minerals and gangue minerals are closely combined, and a large amount of gangue minerals are introduced into the separation process, so the grade improvement of niobium concentrate is limited
Moreover, the energy consumption of the complete melting process of pellets is high, which is not conducive to industrial application

Method used

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  • Method for converting niobium minerals in niobium rough concentrate into niobium ore and producing niobium concentrate
  • Method for converting niobium minerals in niobium rough concentrate into niobium ore and producing niobium concentrate
  • Method for converting niobium minerals in niobium rough concentrate into niobium ore and producing niobium concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] The niobium rough concentrate with a niobium grade of 2.24% obtained from the pre-selection of niobium-containing raw ore in Bayan Obo is used as the main raw material. The chemical composition is shown in Table 1. The types of niobium-containing minerals include niobium iron ore, ferroniobium rutile, and niobium calcium ore. In this example, the alkalinity is regulated to be 1.5, Na 2 CO 3 The content was adjusted to 0.5%.

[0074] Table 1 Chemical composition of raw materials / wt%

[0075]

[0076] Take 20g of niobium coarse concentrate and add 1.2g of petroleum coke as a reducing agent. After fully mixing by a pulverizer, add 2mL of 5% PVA solution, and use a press and a mold to shape the mixture to obtain a cylinder with a diameter of Φ30mm. After drying in the oven for 8h, it was placed in a tube furnace, and the N 2 It was calcined at 1000℃ for 60min under the condition of protective gas. After cooling in the furnace, it was found by electron microscope that 5...

Embodiment 2

[0078] The niobium coarse concentrate with a niobium grade of 2.24% obtained by pre-selection of niobium-containing raw ore is used as the main raw material. The chemical composition is shown in Table 1. The types of niobium-containing minerals include niobium iron ore, ferroniobium rutile, and niobium calcium ore. In this example, the alkalinity is regulated to be 1.5, Na 2 CO 3 The content was adjusted to 2%.

[0079] Take 20g of niobium coarse concentrate, mix with 1.2g of petroleum coke, mix thoroughly with a pulverizer, mix with 2mL of 5% PVA solution, use a press and a mold to shape the mixture to obtain a cylinder with a diameter of Φ30mm, and dry it in an oven After 8h, it was placed in a tube furnace, and N 2 It was roasted at 1000°C for 90min under the condition of protective gas. After cooling in the furnace, it was found by electron microscope that 90% of the niobium minerals were transformed into granular niobium ore with a small amount of Ca, and the grain siz...

Embodiment 3

[0081] The niobium coarse concentrate with a niobium grade of 2.24% obtained by pre-selection of niobium-containing raw ore is used as the main raw material. The chemical composition is shown in Table 1. The types of niobium-containing minerals include niobium iron ore, ferroniobium rutile, and niobium calcium ore. In this example, the alkalinity is regulated to be 1.5, Na 2 CO 3 The content was adjusted to 5%.

[0082] Take 20g of niobium coarse concentrate, mix with 1.2g of petroleum coke, mix thoroughly with a pulverizer, mix with 2mL of 5% PVA solution, use a press and a mold to shape the mixture to obtain a cylinder with a diameter of Φ30mm, and dry it in an oven After 8h, it was placed in a tube furnace, and N 2 It was roasted at 1000 ℃ for 90 min under the condition of protective gas. After cooling in the furnace, it was found by electron microscope that 90% of the niobium minerals were converted into granular Naniobium ore with Ca inclusions, and the grain size was ...

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Abstract

The invention discloses a method for converting niobium minerals in niobium rough concentrates into niobium niobium ore and producing niobium concentrates, including: obtaining a mixture containing niobium rough concentrates, wherein the basicity of the niobium rough concentrates is About 1.0 to about 2.0, Na 2 CO 3 The content is adjusted to about 0.5% to about 5%; the mixture is placed in an inert protective gas, and roasted at a temperature of about 900 ° C to about 1050 ° C, so that the iron element in the niobium rough concentrate is reduced to metal in a weak reducing atmosphere iron and convert at least a portion of the niobium-bearing minerals in the niobium rough concentrate to bardite. The method of the invention has strong adaptability to niobium rough concentrate, and is also suitable for basic or acidic niobium rough concentrate. By controlling the basicity, roasting atmosphere and roasting temperature, various niobium minerals in the niobium rough concentrate are concentrated and controlled into sodium Niobium ore, and the change of gangue minerals is small, which avoids the close combination of niobium minerals and gangue minerals, and provides powerful conditions for the subsequent sorting to obtain high-quality niobium concentrates containing sodium niobium ore.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and beneficiation, in particular to a method for converting niobium minerals in niobium rough concentrates into niobium ore and producing niobium concentrates. Background technique [0002] Niobium is an important strategic metal widely used in steel, aerospace, electronic information and other fields. Bayan Obo iron-niobium-rare earth polymetallic ore is the largest niobium resource base in my country. However, due to the variety and complex composition of niobium-containing minerals, the proportion of low-niobium-containing minerals (ferroniobium rutile, calcite) is high and low. The content of iron-rich niobium minerals (niobium ore, pyrochlore) is small, and its embedded particle size is fine, most of which are less than 20 μm, and it is closely symbiotic with other minerals. Conventional beneficiation processes can only obtain Nb 2 O 5 Niobium coarse concentrates with grades below 5% cann...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B34/24C21B13/00
CPCC22B1/02C22B34/24C21B13/0066C21B13/0073
Inventor 陈雯卢翔刘小银李家林周瑜林许海峰邓秋凤
Owner CHANGSHA RES INST OF MINING & METALLURGY
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