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Niobium ore pre-enrichment and dressing-smelting method

A pre-enrichment, beneficiation and smelting technology, applied in the field of niobium beneficiation and smelting, can solve the problems of niobium ore prone to sliming, low niobium recovery rate and high cost, so as to reduce the slimming phenomenon, high niobium recovery rate and loss low rate effect

Active Publication Date: 2022-03-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned niobium ore sorting process prone to mudification, low niobium recovery rate, high energy consumption and high cost problems in the smelting process, the present invention is specially proposed

Method used

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  • Niobium ore pre-enrichment and dressing-smelting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Step (1): Nb in a pyrochlore mine 2 o 5 The content is 1.2%, the main gangue minerals are calcite, dolomite, feldspar, etc., the content of CaO is 34.9%, the content of MgO is 6.3%, and the total burning loss is 19.9%. Crush the pyrochlore ore to less than 15mm, send it to the roaster for pre-roasting, the pre-roasting temperature is 950°C, the pre-roasting time is 60min, the roasting atmosphere is an oxidizing atmosphere (air, the same below), and the loss on ignition rate is the total burning of the ore 89.4% of losses. The pre-roasted product was digested in water, the liquid-solid ratio of the initial digestion solution was 3:1L / kg, the digestion water temperature was 90°C, and the digestion time was 10 minutes. The digested product is subjected to gravity separation, and the heavy product obtained is the pre-enrichment concentrate, and the light product is the pre-enrichment tailings.

[0081] Step (2): Finely grind the pre-enriched concentrate to -100 mesh, mix...

Embodiment 2

[0084] Compared with Example 1, the only difference is that the temperature in the pre-calcination stage of step (1) is changed to 800°C, 900°C, 1000°C, and 1100°C, respectively.

[0085] The results at each temperature are shown in Table 1:

[0086] Table 1 Pre-enrichment and beneficiation indicators of niobium ore at different pre-roasting temperatures

[0087]

[0088] It can be seen from Table 1 that as the pre-roasting temperature increases from 800 °C to 1100 °C, the pre-enrichment tailings first increase and then decrease, and the change trend of the total niobium recovery rate is the same.

Embodiment 3

[0090] Compared with Example 1, the only difference is that the temperature in the carbonitriding and roasting stage of step (2) is changed to 1200°C, 1300°C, 1400°C, and 1500°C, respectively.

[0091] The results at each temperature are shown in Table 2:

[0092] Table 2 Pre-enrichment and beneficiation indicators of niobium ore at different carbonitriding roasting temperatures

[0093]

[0094] It can be seen from Table 1 that as the carbonitriding roasting temperature increases from 1200 °C to 1500 °C, the change trends of the recovery rate of weak magnetic separation niobium, the recovery rate of strong magnetic separation niobium and the total recovery rate of niobium are basically the same, all rising first After high temperature, it decreases, and the index of carbonitriding roasting temperature is 1400℃ is the best, and the total recovery rate of niobium is 80.4%.

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Abstract

The invention belongs to the technical field of mineral smelting, and particularly discloses a method for pre-enriching niobium ore. The niobium ore is roasted at the temperature of 800-1100 DEG C and then placed in water to be digested, then gravity separation treatment is carried out, the obtained heavy product is pre-enriched concentrate, and the obtained light product is pre-enriched tailings. The invention also comprises a dressing and smelting method for carbonitriding and roasting the pre-enriched concentrate. The method has the advantages of simple process, high niobium recovery rate, low energy consumption and the like, is easy to implement industrially, and has very wide popularization and application prospects.

Description

technical field [0001] The invention belongs to the technical field of beneficiation and smelting of rare metal ores, in particular to a method for beneficiation and smelting of niobium ores. Background technique [0002] Niobium is a rare refractory metal with excellent properties such as high temperature resistance, corrosion resistance, low vapor pressure, good ductility and high thermal conductivity. As an important strategic metal, it is an indispensable metal in modern industry and cutting-edge technology Materials are widely used in the fields of iron and steel, chemical industry, aerospace, nuclear industry, superconductivity, electrical appliances, electronic information and medicine. [0003] About 90% of niobium resources are used to produce microalloyed steel in the form of niobium ferroalloy. The main producing and exporting countries of niobium ferroalloy are Brazil and Canada, and the main consuming and importing countries include China, the United States, Jap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/24C22B1/02C22B1/00C22B1/24C22B1/16
CPCC22B34/24C22B1/02C22B1/00C22B1/24C22B1/16Y02P10/20
Inventor 饶明军李光辉张树辉姜涛彭志伟张鑫罗骏肖仁栋游锦香
Owner CENT SOUTH UNIV
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