Method for preparing ferroniobium through aluminothermic reduction

A technology of thermite and ferroniobium, which is applied in the field of smelting ferroniobium alloys, can solve the problems of low niobium utilization rate and easy introduction of impurity aluminum, etc., and achieve the effects of sufficient thermite reduction reaction, saving the amount of aluminum used, and improving quality

Active Publication Date: 2016-12-07
CHENGDU TECHCAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is to overcome the problems of low niobium utilization rate in the ferroniobium smelting method existing in the prior art, and the problems that im

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Raw material Nb that will meet production requirements 2 o 5 , aluminum pellets, iron pellets, lime, and fluorspar are mixed and then added to a tiltable electric arc furnace for smelting in three phases. The ratio of aluminum ratio α:β:γ=1.3:0.9:0.5, (α*5+ β*3+γ*2) / 10=1.02, Phase 1 raw material: Nb 2 o 5 (Purity 97.0%) 1000kg, with 440kg of aluminum, 505kg of iron and 150kg of lime. Mix the material evenly and put it into the furnace. The secondary voltage is 190V to energize and start the arc. After the furnace material is cleared, the secondary voltage is 135V. After the smelting was electrified for 40 minutes, the residual niobium in the slag was quickly analyzed to be 0.23%, the theoretical slag amount in the furnace was 980kg, and the slag output was 710kg; after that, the second phase raw material: Nb 2 o 5 600kg (purity 97.0%), with 183kg of aluminum, 302kg of iron, and 90 kg of lime; after the furnace material is cleared, the secondary voltage is 150V, an...

Embodiment 2

[0057] Raw material Nb that will meet production requirements 2 o 5 , aluminum pellets, iron pellets, lime, and fluorspar are mixed and then added to a tiltable electric arc furnace for smelting in three phases. The aluminum ratio α:β:γ=1.2:0.9:0.75, (α*5+ β*3+γ*2) / 10=1.02, Phase 1 raw material: Nb 2 o 5 (Purity 96.5%) 1000kg, with 406kg of aluminum, 327kg of iron and 150kg of lime. Mix the material evenly and put it into the furnace. The secondary voltage is 190V to energize and start the arc. After the furnace material is cleared, the secondary voltage is 135V. After smelting and electrifying for 40 minutes, the residual niobium in the slag was quickly analyzed to be 0.31%, the theoretical slag amount in the furnace was 990kg, and the slag output was 720kg; after that, the second phase raw material: Nb 2 o 5 600kg (purity 96.5%), with 182kg of aluminum, 196kg of iron, and 90 kg of lime; after the furnace material is cleared, the secondary voltage is 150V, and after 30 ...

Embodiment 3

[0059] Raw material Nb that will meet production requirements 2 o 5 , aluminum pellets, iron pellets, lime, and fluorspar are mixed and then added to a tiltable electric arc furnace for smelting in three phases. The ratio of aluminum ratio α:β:γ=1.2:1:0.6, (α*5+ β*3+γ*2) / 10=1.02, Phase 1 raw material: Nb 2 o 5 (Purity 96.3%) 1000kg, with 407kg of aluminum, 258kg of iron and 150kg of lime. Mix the material evenly and put it into the furnace. The secondary voltage is 190V to energize and start the arc. After the furnace material is cleared, the secondary voltage is 135V. After the smelting was electrified for 40 minutes, the residual niobium in the slag was quickly analyzed to be 0.29%, the theoretical slag amount in the furnace was 980kg, and the slag output was 720kg; after that, the second phase raw material: Nb 2 o 5 600kg (purity 96.3%), with 203kg of aluminum, 154kg of iron, and 90 kg of lime; after the furnace material is cleared, the secondary voltage is 150V, and ...

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Abstract

The invention discloses a method for preparing ferroniobium through aluminothermic reduction. The method includes the following steps that firstly, a method in which multiple periods of smelting and gradient aluminum matching are combined is adopted for smelting, the multiple periods of smelting mean that Nb2O5 to be smelted and aluminum to be smelted are added into a tipping furnace in several batches to be smelted, after each batch is smelted, 55%-90% of lean slag is removed in a tipping manner, then the materials of the next batch are added repeatedly for continuous smelting, lean slag is removed in a tipping manner, gradient aluminum matching means that the aluminum matching proportions of all the batches are reduced in a gradient manner, the total aluminum matching amount is equivalent to 1.01-1.04 times, preferably 1.02 times, of the total reaction material proportion; and secondly, the smelted materials are poured into a die, and a ferroniobium alloy can be obtained after cooling. By means of the method, the content of niobium in the slag can be reduced while the aluminum consumption of a single furnace is reduced, and the ferroniobium smelting yield is increased.

Description

technical field [0001] The invention relates to a method for smelting ferroniobium alloys, in particular to a method for preparing ferroniobium by aluminothermic reduction, which belongs to the field of metallurgy and adopts a tilting furnace to realize aluminothermic reduction to prepare ferroniobium. Background technique [0002] About 90% of the world's niobium production is used in the steel industry, and most of them are added to steel in the form of niobium-iron alloy. Niobium in steel can refine the structure and grain of steel, increase the grain coarsening temperature, thereby reducing overheating sensitivity, and improving the toughness, strength and wear resistance of steel products. Niobium-containing steel is widely used because of its high strength, good toughness, wear resistance and corrosion resistance. [0003] At present, most domestic ferro-niobium manufacturers adopt the aluminothermic smelting process outside the furnace. The prepared charge is ignited...

Claims

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Application Information

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IPC IPC(8): C22C35/00C22C27/02C22C1/02C22B34/24C22B4/06
CPCC22B4/06C22B34/24C22C1/02C22C27/02C22C35/00
Inventor 鲜勇丁义超王静邱士安张凤春
Owner CHENGDU TECHCAL UNIV
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