A kind of preparation method of low-grade niobium-titanium iron alloy

A ferroalloy, niobium-titanium technology, applied in the field of ferroalloy smelting, can solve the problems of unfavorable industrialization implementation, difficult operation, high equipment requirements, etc., and achieve the effect of facilitating industrialization implementation, reducing production costs and reducing costs

Active Publication Date: 2017-12-22
包钢集团矿山研究院(有限责任公司)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above method, the briquetting process needs to be heated, and molten iron needs to be added to the melting and smelting parts, which will make the operation complicated and difficult, which is not conducive to industrial implementation
Moreover, the use of coal powder as the reducing agent will increase the amount of slag and reduce the niobium content of the niobium-rich slag, and the titanium in the raw material will not be recovered, resulting in waste of resources
[0007] To sum up, the conventional methods for manufacturing niobium-titanium-iron alloys or niobium-titanium alloys in the prior art have the problems of high energy consumption, difficult operation, and high requirements for equipment, so it is difficult to meet the requirements of large-scale and long-term industrial production

Method used

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  • A kind of preparation method of low-grade niobium-titanium iron alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] (1) Gas-solid selective reduction

[0070] a. Weigh 4000kg of niobium-titanium concentrate and 2000kg of coke powder and dry them in a tunnel drying kiln with a moisture content of less than 2%;

[0071] b. Put the niobium-titanium concentrate into the middle ring of the silicon carbide reaction tank, lay a certain thickness of coke powder on the bottom of the tank, fill the inner and outer rings of the tank and all the remaining space with coke powder, and then cover and seal;

[0072] c. Carry out gas-solid selective reduction of the filled tank in a tunnel kiln at a temperature of 1000°C for 35 hours, and cool naturally after the reaction;

[0073] d. A total of 3200kg of reduced niobium-titanium concentrates were produced, with an average composition of Nb 2 o 5 Content 5.98wt%, FeO content 12.8wt%, TFe content 49.68wt%, TiO 2 Content 9.77wt%, SiO 2 The CaO content is 25.9wt%, the CaO content is 1.58wt%, and the F content is 0.99wt%.

[0074] (2) Furnace meltin...

Embodiment 2

[0089] (1) Selective reduction

[0090]a. Weigh 4000kg of niobium-titanium concentrate and 2000kg of coke powder and dry them in a tunnel drying kiln with a moisture content of less than 2%;

[0091] b. Put the niobium-titanium concentrate into the middle ring of the silicon carbide reaction tank, lay a certain thickness of coke powder on the bottom of the tank, fill the inner and outer rings of the tank and all the remaining space with coke powder, and then cover and seal;

[0092] c. Carry out gas-solid selective reduction of the filled tank in a tunnel kiln at a temperature of 1050°C for 30 hours, and cool naturally after the reaction;

[0093] d. A total of 3180kg of reduced niobium-titanium concentrates were produced, with an average composition of Nb 2 o 5 Content 6.1wt%, FeO content 12.67wt%, TFe content 49.54wt%, TiO 2 Content 9.8wt%, SiO 2 The CaO content is 25.7wt%, the CaO content is 1.57wt%, and the F content is 0.97wt%.

[0094] (2) Furnace melting

[0095] ...

Embodiment 3

[0109] (1) Selective reduction

[0110] a. Weigh 4000kg of niobium-titanium concentrate and 2000kg of coke powder and dry them in a tunnel drying kiln with a moisture content of less than 2%;

[0111] b. Put the niobium-titanium concentrate into the middle ring of the silicon carbide reaction tank, lay a certain thickness of coke powder on the bottom of the tank, fill the inner and outer rings of the tank and all the remaining space with coke powder, and then cover and seal;

[0112] c. Carry out gas-solid selective reduction of the filled tank in a tunnel kiln at a temperature of 1150°C for 30 hours, and cool naturally after the reaction;

[0113] d. A total of 3206kg of reduced niobium-titanium concentrates were produced, with an average composition of Nb 2 o 5 Content 6.21wt%, FeO content 12.72wt%, TFe content 49.6wt%, TiO 2 Content 9.82wt%, SiO 2 The CaO content is 25.6wt%, the CaO content is 1.57wt%, and the F content is 0.98wt%.

[0114] (2) Furnace melting

[0115...

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Abstract

The invention relates to a preparation method of low-grade niobium-titanium ferroalloy. Concretely, the invention relates to the smelting technology of ferroalloy, and provides the preparation method of low-grade niobium-titanium ferroalloy. The preparation method comprises three steps: gas-solid selective reduction, electric furnace smelting separation, and electric furnace smelting. The method has the advantages of low cost, low energy consumption, high recovery rate of niobium and titanium, and simple operation; the method is good for industrial implementation.

Description

technical field [0001] The invention belongs to the technical field of ferroalloy smelting, and relates to a method for preparing low-grade ferro-niobium-titanium alloy by smelting low-grade niobium-titanium concentrate. The method includes the following steps: gas-solid selective reduction, electric furnace melting and electric furnace smelting. Background technique [0002] Nb and Ti have many advantages as microalloying elements, which can significantly improve the properties of steel and have great economic advantages. The role of microalloying elements Nb and Ti in steel is mainly manifested in two aspects: one is to inhibit the deformation and recrystallization of austenite and prevent the growth of its grains during hot working; the other is to pass through their carbon The strain-induced precipitation of nitrogen compounds exerts the precipitation strengthening effect of Nb and Ti. Nb has the strongest grain refinement strengthening effect in steel, and the grain re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C33/04
Inventor 李春龙李小钢徐广尧张志宏王小青叶新杜国萍贾中帅韩淑霞梁文京
Owner 包钢集团矿山研究院(有限责任公司)
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