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Method for preparing niobium pentoxide from low-grade niobium ore

A niobium pentoxide, low-grade technology, applied in chemical instruments and methods, niobium compounds, inorganic chemistry, etc., can solve the problems of large acid consumption, complex intercalation relationship, and difficult beneficiation and smelting.

Pending Publication Date: 2021-07-23
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A large-scale low-grade niobium deposit, containing 0.02-0.04% niobium, has a wide variety of minerals, complex intercalation relationships, and great difficulty in beneficiation and smelting. It has not been economically and effectively developed and utilized.
In the previous research work, there were conventional beneficiation processes such as "heavy-magnetic-flotation", "heavy-magnetic-flotation-heavy", "heavy-float-magnetic-reverse-flotation" and other conventional mineral processing combined processes. There are complex processes, long processes, and useful minerals The technical problem of low recovery rate, and the high energy consumption of the grinding operation, the large amount of fine tailings produced by the flotation operation requires large-capacity tailings storage and disposal, and the difficulty of wastewater treatment and reuse; Acid leaching-extraction-precipitation" and other conventional hydrometallurgical leaching techniques. The conventional hydrometallurgical process is suitable for the leaching of high-grade ores. The cost of low-grade ores is too high, and there are problems such as large acid consumption, high cost, and large environmental pollution. ; There are also techniques such as conventional alkaline leaching, acid-mixed aging leaching and microbial leaching, all of which have the problem of low leaching rate

Method used

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  • Method for preparing niobium pentoxide from low-grade niobium ore
  • Method for preparing niobium pentoxide from low-grade niobium ore
  • Method for preparing niobium pentoxide from low-grade niobium ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The method for preparing niobium pentoxide from low-grade niobium ore of the present embodiment, the process flow chart is as follows figure 1 shown, including the following steps:

[0035] 1) The niobium ore is crushed to 0.5-3mm, and the pre-selected ore is obtained through the pre-selection and tailing of the non-pressure two-product heavy-medium cyclone; the medium density of the heavy-medium cyclone is 2.45g / cm 3 , the medium is a suspension of ferrosilicon powder and water, and the working pressure (media inlet pressure) is 0.15MPa.

[0036] 2) Finely grind the pre-selected concentrate until 100% is less than 0.074mm, first carry out sulfate roasting, and then carry out sulfuric acid leaching;

[0037]Sulfation roasting is to mix and roast the finely ground pre-selected concentrate and concentrated sulfuric acid, the amount of concentrated sulfuric acid is 50% of the ore weight, the roasting temperature is 210°C, and the roasting time is 120 minutes.

[0038] Su...

Embodiment 2-3

[0045] The method for preparing niobium pentoxide from low-grade niobium ore in Examples 2-3 is basically the same as that in Example 1, and the differences in specific process parameters are listed in Table 1.

[0046] The process parameters of the method of table 1 embodiment 2-3

[0047]

[0048]

[0049] 2. Experimental example

[0050] This experimental example takes Examples 1-3 as examples to illustrate the test results of the method of the present invention, which are specifically shown in Tables 2-4.

[0051] The test result of the method of table 2 embodiment 1

[0052]

[0053] The above test results show that: raw ore is crushed—preselected by dense medium cyclone—sulfated roasting—leaching—high temperature pressure cooking to sink niobium—oxalic acid hot melting—chemical impurity removal—crystallization and decomposition to refine niobium pentoxide products. The tailing rate of pre-selection in the cyclone is 93.76%, the recovery rate of useful mineral ...

Embodiment 2

[0057] In Example 2, the heavy medium cyclone pre-selected tailings was 90.74%, the recovery rate of useful mineral niobium was 83.56%, and the tailing effect was ideal; the pre-selected concentrate was then leached by sulfate roasting-high temperature pressure cooking to sink niobium; niobium leaching rate 89.67%, niobium precipitation rate 99.86%, high niobium precipitation efficiency, low loss rate, niobium metallurgical recovery rate 89.54%; finally after oxalic acid hot melting to remove impurities, crystallization and decomposition to refine niobium pentoxide, the product purity is 99.91%, the total niobium dressing and smelting The recovery rate is 74.82%, which greatly improves the utilization rate of niobium resources.

[0058] The test result of the method of table 4 embodiment 3

[0059]

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Abstract

The invention belongs to the field of preparation of niobium pentoxide, and particularly relates to a method for preparing niobium pentoxide from low-grade niobium ore. The method comprises the following steps: (1) crushing niobium ore, and then pre-selecting and discarding tailings through a dense medium cyclone to obtain pre-selected concentrate; (2) the pre-selected concentrate is subjected to sulfating roasting and sulfuric acid leaching, and a leaching solution is obtained; and (3) heating and autoclaving the leachate to precipitate niobium, performing hot melting impurity removal and crystallization on the obtained niobium precipitate by using oxalic acid to obtain niobium oxalate crystals, and calcining the niobium oxalate crystals to obtain niobium pentoxide. Compared with an early-stage combined mineral separation process, a high-temperature acid decomposition extraction process and other processes, the method for preparing niobium pentoxide from the low-grade niobium ore is simple in process, short in process, high in niobium ore recovery rate, relatively low in production cost and beneficial to development and utilization of mineral resources.

Description

technical field [0001] The invention belongs to the field of preparation of niobium pentoxide, in particular to a method for preparing niobium pentoxide from low-grade niobium ore. Background technique [0002] Niobium is a rare metal with a high melting point, and it is also an important strategic metal in short supply in my country. It has excellent properties such as high temperature resistance, corrosion resistance, wear resistance, and good mechanical properties. It is widely used in steel, alloys, superconductivity, electronics, aerospace, atomic energy, Biomedical and other high-tech fields. With the development of world science and technology and the continuous growth of consumption of electronic products, the demand for niobium has increased sharply. my country is relatively rich in niobium resources, but most of them belong to polymetallic co-associated deposits. The properties and composition of the ore are complex, the embedded particle size is fine, the grade is...

Claims

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Application Information

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IPC IPC(8): C01G33/00
CPCC01G33/00C01P2006/80
Inventor 吕子虎程宏伟卫敏刘长淼赵登魁吴东印
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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