Method for comprehensively recovering niobium, rare earth and titanium from polymetallic ore containing iron, niobium and rare earth

A polymetallic ore and rare earth concentrate technology, applied in the field of niobium resource utilization, can solve problems such as low grade, difficult and efficient enrichment of niobium ore phases, and failure to meet the production standards of high-grade ferroniobium, achieving remarkable economic and social benefits, The effect of strong process operability and simple process steps

Active Publication Date: 2021-10-15
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 comprehensively recovering niobium, rare earth and titanium from polymetallic ore containing iron, niobium and rare earth
  • Method for comprehensively recovering niobium, rare earth and titanium from polymetallic ore containing iron, niobium and rare earth
  • Method for comprehensively recovering niobium, rare earth and titanium from polymetallic ore containing iron, niobium and rare earth

Examples

Experimental program
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Effect test

Embodiment 1

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

[0041] (1) Iron, niobium, rare earth polymetallic ore (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), reducing agent (the present embodiment selects coke, and its C content 84%) carries out mixing batching by the mass ratio of 100:4;

[0042] (2) Put the ingredients obtained in step (1) into the electric furnace for smelting, smelting and producing slag and flue gas; control the smelting temperature at 1500°C, and the smelting time for 30 minutes; adjust the furnace by controlling the composition of the ingredients in step (1). Oxygen potential to a suitable range, this step smelting does not pro...

Embodiment 2

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

[0049] (1) Iron, niobium, rare earth polymetallic ore (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 of 1.87%, niobium mainly exists in the form of niobite, niobium-iron rutile, and calcite), slagging agent (this embodiment selects limestone and dolomite with a mass ratio of 1:1), reducing agent (this embodiment selects mass ratio Ratio 1:0.5 anthracite and granulated coal, the average C content is 83%) are mixed and proportioned according to the mass ratio of 100:5:10;

[0050] (2) put the ingredients obtained in step (1) into the converter for smelting, and smelt to produce iron-containing alloys, slag and flue gas; control the smelting temperature to 1450 ° C, and sme...

Embodiment 3

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

[0057] (1) Iron, niobium, rare earth polymetallic ore (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 0.34%, niobium mainly exists in niobite, niobium-iron rutile, calcite form), slagging agent (this embodiment selects silica), reducing agent (this embodiment selects pulverized coal) according to the ratio of 100:10:18 Mix the ingredients according to the mass ratio;

[0058] (2) Put the ingredients obtained in step (1) into the blast furnace for smelting, and smelt to produce iron-containing alloys, slag and flue gas; control the smelting temperature to 1550° C., and the smelting time for 20 minutes; by controlling the ingredients in the step (1), and Monitor the recovery...

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Abstract

The invention discloses a method for comprehensively recovering niobium, rare earth and titanium from polymetallic ores containing iron, niobium and rare earths. 50): (2‑25) mass ratio for mixing ingredients; put the obtained ingredients into the smelting furnace for smelting, and smelting produces slag and flue gas; by controlling the composition of ingredients and the oxygen potential in the furnace, and monitoring the smelting output The components, the recovery rate of iron to adjust the oxygen potential in the furnace and CaO / SiO 2 Mass ratio to the appropriate range, the CaO / SiO of the slag 2 The mass ratio is 0.8 to 2.3; the output slag is discharged into the slag bag, cooled and crystallized to obtain slag containing multi-phase minerals; the slag is crushed and finely ground, and processed by mineral processing to obtain high-grade refined slag containing niobium, rare earth and titanium. ores and high-grade rare earth concentrates. The invention has simple process, convenient operation and strong practicability, and can comprehensively obtain various valuable metal elements and various high-grade concentrates.

Description

technical field [0001] The invention belongs to the field of niobium resource utilization, and specifically relates to a metallurgical 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 es...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B34/12C22B34/24C22B1/00C21B11/10C21B11/06C21B11/02C21B11/00
CPCC21B11/00C21B11/02C21B11/06C21B11/10C22B1/00C22B34/1209C22B34/24C22B59/00Y02P10/143Y02P10/20
Inventor 陈雯任国兴肖松文李家林彭泽友周瑜林
Owner CHANGSHA RES INST OF MINING & METALLURGY
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