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Method for enriching and recycling niobium, rare earth and titanium from polymetallic ore containing iron, niobium and rare earth

A polymetallic ore and rare earth technology, applied in the field of niobium resource utilization, can solve problems such as low grade, difficulty in high-efficiency enrichment of niobium ore phases, failure to meet high-grade ferroniobium production standards, etc., and achieve strong process operability and economical rationality , The effect of simple process steps

Active Publication Date: 2021-01-29
CHANGSHA RES INST OF MINING & METALLURGY
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  • Abstract
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  • Claims
  • Application Information

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 enriching and recycling niobium, rare earth and titanium from polymetallic ore containing iron, niobium and rare earth
  • Method for enriching and recycling niobium, rare earth and titanium from polymetallic ore containing iron, niobium and rare earth
  • Method for enriching and recycling niobium, rare earth and titanium from polymetallic ore containing iron, niobium and rare earth

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Effect test

Embodiment 1

[0040] A method for enriching and recovering niobium, rare earth and titanium from polymetallic ores containing iron, niobium and rare earth, comprising the following steps:

[0041] (1) Complex ore materials containing low-grade niobium / rare earth / titanium (such as low-grade niobium concentrate obtained from primary beneficiation, the Nb 2 o 5 Content is 2.37%, TiO 2 content 4.13%, Fe content 16.75%, rare earth oxide REO content 3.32%, 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, contains C content 84%) by 100:20:4 mass ratio for mixing ingredients;

[0042] (2) Put the ingredients obtained in step (1) into the electric furnace for smelting, and smelt to produce slag and flue gas; control the smelting temperature to 1550°C, and the smelting time for 30 minut...

Embodiment 2

[0048] A method for enriching and recovering niobium, rare earth and titanium from polymetallic ores containing iron, niobium and rare earth, comprising the following steps:

[0049] (1) Complex ore materials containing low-grade niobium / rare earth / titanium (such as iron niobium rare earth concentrate, its Nb 2 o 5 Content is 5.40%, TiO 2 content 4.29%, Fe content 35.09%, rare earth oxide REO content 4.11%, CaO content 3.91%, SiO 2 Content 20.05%, MgO content 1.17%, Al 2 o 3 content of 0.34%, niobium mainly exists in the form of niobite, niobium-iron rutile, and calcite), slagging agent (this embodiment uses a mixture of limestone and dolomite with a mass ratio of 1:1), reducing agent (this embodiment uses A mixture of anthracite and granular coal at a mass ratio of 1:0.5, with a total average C content of 79%) is mixed with a mass ratio of 100:73:15;

[0050] (2) Put the ingredients obtained in step (1) into the shaft furnace for smelting, and smelt to produce iron-conta...

Embodiment 3

[0056] A method for enriching and recovering niobium, rare earth and titanium from polymetallic ores containing iron, niobium and rare earth, comprising the following steps:

[0057] (1) Complex ore materials containing low-grade niobium / rare earth / titanium (such as ferroniobium concentrate, its Nb 2 o 5 Content is 3.52%, TiO 2 content 4.29%, Fe content 14.03%, rare earth oxide REO content 1.50%, 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 dolomite), reducing agent (this embodiment selects pulverized coal, C content 89%) by 100:54:6 mass ratio for mixing ingredients;

[0058] (2) Put the ingredients obtained in step (1) into the converter for smelting, and smelt to produce slag and flue gas; control the smelting temperature to 1550°C, and the smelting time for 30 minutes; by controlling the composition of the ingredients i...

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Abstract

The invention discloses a method for enriching and recycling niobium, rare earth and titanium from polymetallic ore containing iron, niobium and rare earth. The method comprises the following steps: mixing the polymetallic ore containing iron, niobium and rare earth, a slag former and a reducing agent in a mass ratio of 100: (2100): (0-30); putting the ingredients into a smelting furnace to be smelted, and producing furnace slag and smoke; adjusting an oxygen potential in the furnace and the CaO / SiO2 mass ratio to an appropriate range by controlling the composition in the ingredients and the oxygen potential in the furnace, and monitoring the components of a smelting product and a recovery rate of iron, wherein the CaO / SiO2 mass ratio is 2.5-6.0; discharging the produced slag into a slag ladle, cooling and crystallizing; crushing and finely grinding the obtained slag to obtain slag powder; treating the obtained slag powder by adopting a beneficiation process to obtain high-grade composite concentrate containing niobium, rare earth and titanium. The method is simple in step, convenient to operate and good in economic benefit, and can obtain the composite concentrate for comprehensively recycling various valuable metals.

Description

technical field [0001] The invention belongs to the field of niobium resource utilization, and in particular relates to a method for comprehensively recovering niobium, rare earth and titanium with low-grade niobium-containing polymetallic ore. 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 ex...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B34/12C22B34/24C22B1/00C21C5/36C21B11/10C21B11/02C21B11/06
CPCC21B11/02C21B11/06C21B11/10C22B1/00C22B34/1209C22B34/24C22B59/00Y02P10/143Y02P10/20
Inventor 陈雯肖松文任国兴彭泽友李家林周瑜林
Owner CHANGSHA RES INST OF MINING & METALLURGY
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