Method for producing high-grade niobium concentrate from niobium rough concentrate

A technology of rough concentrate and niobium concentrate, which is applied in the field of niobium resource utilization, can solve the problems of low grade, difficulty in high-efficiency enrichment of niobium ore phases, and failure to meet the production standards of high-grade ferroniobium, so as to achieve simple process steps and realize comprehensive Useful and operable effects

Active Publication Date: 2021-02-02
CHANGSHA RES INST OF MINING & METALLURGY
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AI Technical Summary

Problems solved by technology

However, the niobium-rich material Nb produced by this type of process 2 o 5 The grade is still low, less than 15%, still unable to meet the needs of high-grade ferro-niobium production
Compared with the process of magnetization roasting / reduction roasting-magnetic separation to remove iron and enrich niobium, the niobium grade of the niobium flotation concentrate obtained by this method can be significantly improved, but the produced niobium-rich slag concentrate (also known as niobium Concentrate) niobium grade is still not up to the production standard of high-grade ferroniobium, the reason is that the concentrated transformation of niobium in the slag to a single high-grade niobium ore phase cannot be realized only through slow cooling and crystallization of slag
Relevant literature shows that there are still many kinds of niobium-containing ore phases in the slag after slow crystallization, including calcinite, niobite, niobium-calcite and yellow green stone, and the dispersed and coexistent niobium ore phases are difficult to be efficiently enriched by flotation. Collection, and thus unable to obtain niobium concentrate for high-grade ferroniobium

Method used

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  • Method for producing high-grade niobium concentrate from niobium rough concentrate

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A method for producing high-grade niobium concentrate from niobium rough concentrate, comprising the steps of:

[0035] (1) Coarse niobium concentrate (Nb 2 o 5 Content is 3.52%, TiO 2 content 4.29%, rare earth oxide REO content 1.50%, total Fe content 14.03%, CaO content 14.03%, SiO 2 Content 12.75%, MgO content 10.05%, Al 2 o 3 Content 1.87%, niobium mainly exists in niobite, niobium-iron rutile, calcite form), slagging agent (this embodiment selects limestone for use), reducing agent (this embodiment selects coke for use, and its C content 84%) presses 100:30:5 mass ratio for mixing ingredients;

[0036] (2) Put the ingredients obtained in step (1) into the electric furnace for smelting, and smelt to produce iron-containing alloys, slag and flue gas; control the smelting temperature to 1500 ° C, and smelting time for 30 minutes; by controlling the ingredients in the step (1), and Monitor the recovery rate of Fe in the ferrous alloy produced by smelting to adjus...

Embodiment 2

[0042] A method for producing high-grade niobium concentrate from niobium rough concentrate, comprising the steps of:

[0043] (1) Coarse niobium concentrate (Nb 2 o 5 Content is 2.37%, TiO 2 content 4.13%, rare earth oxide REO content 3.32%, total Fe content 16.75%, CaO content 18.94%, SiO 2 content 11.23%, MgO content 11.50%, Al 2 o 3 Content 2.34%, niobium mainly exists in the form of niobite, niobium-iron rutile, calcite, niobium calcium ore), slagging agent (this embodiment selects limestone for use), reducing agent (this embodiment selects coke for use, and its carbon content 87%) carry out mixing batching by the mass ratio of 100:20:15;

[0044] (2) Put the ingredients obtained in step (1) into the converter for smelting, supply air, pure oxygen or oxygen-enriched air during smelting, and smelt to produce iron-containing alloys, slag and flue gas; control the smelting temperature to 1400°C, and the smelting time to 60 minutes; By controlling the batching compositi...

Embodiment 3

[0050] A method for producing high-grade niobium concentrate from niobium rough concentrate, comprising the steps of:

[0051] (1) Coarse niobium concentrate (Nb 2 o 5 The content is 6.31%, TiO 2 content 3.61%, rare earth oxide REO content 2.5%, total Fe content 24.03%, CaO content 4.03%, SiO 2 Content 21.87%, MgO content 1.05%, Al 2 o 3 Content 0.26%, niobium mainly exists in niobite, ferroniobium rutile, calcite form), slagging agent (this embodiment selects limestone), reducing agent (this embodiment selects coal and petroleum coke, and its average carbon content is 89 %) mix the ingredients according to the mass ratio of 100:5:20; then add binders (such as sodium humate, water glass, etc.) to the ingredients to carry out pelletizing and granulation treatment;

[0052] (2) Put the ingredients obtained in step (1) into the shaft furnace for smelting, supply air, pure oxygen or oxygen-enriched air during smelting, and smelt to produce iron-containing alloys, slag and flu...

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Abstract

The invention discloses a method for producing high-grade niobium concentrate from niobium rough concentrate. The method comprises the following steps that the niobium rough concentrate, a slag formerand a reducing agent are mixed and proportioned according to the mass ratio of 100: (0-50): (2-25); wherein the quantity of the slag former is not 0; the obtained ingredients are put into a smeltingfurnace to be smelted, and iron-containing alloy, furnace slag and smoke are produced through smelting; the oxygen potential in the furnace and the mass ratio of CaO/SiO2 are adjusted to a proper range by controlling the composition of ingredients and the oxygen potential in the furnace and monitoring the components of a smelting product and the recovery rate of iron; wherein the recovery rate ofFe in the iron-containing alloy is controlled to be 10%-55%, and the CaO/SiO2 mass ratio of the slag is controlled to be 0.3-0.7; the produced slag is discharged into a cinder ladle, and cooling and crystallizing are carried out; and then fine grinding is conducted after crushing, obtained slag powder is treated through a beneficiation process, and high-grade niobium concentrate is obtained. The method is simple in process, easy to operate and low in cost, and the niobium rough concentrate can be used for producing high-grade niobium concentrate.

Description

technical field [0001] The invention belongs to the field of niobium resource utilization, and in particular relates to a metallurgical method for producing high-grade niobium concentrate from low-grade niobium rough concentrate. Background technique [0002] Niobium is an important strategic metal, which is widely used in steel, aerospace, electronic information and other fields, and is an important strategic resource for national economy and national defense construction. Since 2005, my country has become the world's largest niobium consumer, but my country's niobium demand is extremely dependent on imports, with a foreign dependence rate exceeding 97%. However, in fact, there is no shortage of niobium resources in my country. Baotou Baiyun Obo Iron-niobium-rare earth (Fe-Nb-REE) polymetallic mine is the largest niobium resource base in my country. It has proven Nb 2 o 5 The reserves reach 2.14 million tons, and the prospective reserves are estimated to exceed 6.6 millio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/24C21B13/00C22B7/04
CPCC21B13/006C22B7/004C22B7/04C22B34/24Y02P10/20
Inventor 陈雯肖松文任国兴李家林彭泽友周瑜林
Owner CHANGSHA RES INST OF MINING & METALLURGY
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