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Method for producing high-grade niobium concentrate in two stages of reduction and melting of niobium coarse 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, difficult and efficient enrichment of niobium ore phase, and can not meet the production standards of high-grade ferroniobium, and achieves simple process steps and comprehensive realization. Useful and operable effects

Active Publication Date: 2021-08-31
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • 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 producing high-grade niobium concentrate in two stages of reduction and melting of niobium coarse concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for producing high-grade niobium concentrate in two stages of niobium coarse concentrate reduction-smelting, comprising the following steps:

[0030] (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 (the present embodiment selects limestone for use), reducing agent (the present embodiment selects coke for use, and its C content 84%), The binder is mixed with a mixer according to the mass ratio of 100:30:5:2, and after being mixed by the mixer, carbon-containing pellets are made and dried for later use;

[0031] (2) Spread the dried carbon-containing pellets on the bottom of the converter. The number of pellets is 2 layers. A layer of 15mm thick carbonaceous powder is laid on the bottom of the furna...

Embodiment 2

[0035] A method for producing high-grade niobium concentrate in two stages of niobium coarse concentrate reduction-smelting, comprising the following steps:

[0036] (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 niobite, ferro-niobium rutile, calcite, niobium calcium ore form), slagging agent (this embodiment selects limestone and dolomite for use), reducing agent (this embodiment selects pulverized coal for use, The carbon content is 84%), and the binder is mixed with a mixer according to the mass ratio of 100:20:15:5, and after being mixed by the mixer, carbon-containing pellets are made, and dried for subsequent use;

[0037] (2) Spread the dried carbon-containing pellets on the bottom of the converter. The number of pellets is 3 layers. A layer of 20mm thick carbona...

Embodiment 3

[0041] A method for producing high-grade niobium concentrate in two stages of niobium coarse concentrate reduction-smelting, comprising the following steps:

[0042] (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, niobium-iron rutile, calcite form), slagging agent (this embodiment selects river sand), reducing agent (this embodiment selects anthracite and petroleum coke, and its average carbon content 90%), the binder is mixed with a mixer in a mass ratio of 100:5:20:1, and after being mixed with a mixer, carbon-containing pellets are made, and dried for subsequent use;

[0043] (2) Spread the dried carbon-containing pellets on the bottom of the converter. The number of pellets is 1 layer. A layer of 10mm thick carbonaceous powder is laid on the bottom of the fu...

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Abstract

The invention discloses a method for producing high-grade niobium concentrate in two stages of reducing and melting niobium coarse concentrate, which comprises the following steps: mixing niobium coarse concentrate, slagging agent, reducing agent and binder according to the mass ratio The ingredients are made into carbon-containing pellets and dried for later use; the carbon-containing pellets are spread on the bottom of the smelting furnace, and carbonaceous powder is spread to adjust the atmosphere in the furnace and promote the formation of metallic iron. The carbon-containing pellets are pre-heated in the furnace. Heat, reduction, high-temperature melting; adjust the oxygen potential and CaO / SiO in the furnace by controlling the ingredients composition and oxygen potential in the furnace, and monitoring the composition of the smelting output and the metallization rate of the pellets 2 Mass ratio to an appropriate range; slag CaO / SiO 2 The mass ratio is controlled at 0.3-0.7; the molten slag-iron is discharged out of the furnace with a discharger, cooled and ground, and then enters the flotation process to obtain high-grade niobium concentrate. The invention has simple process, easy operation and low cost, and can produce high-grade niobium concentrate by utilizing niobium rough 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 Patents(China)
IPC IPC(8): C22B1/24C22B34/24C21B13/00
CPCC21B13/006C22B1/2406C22B34/24
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