Method for preparing ferroboron based on thermit self-propagating gradient reduction and slag-washing refining

A self-propagating technology of ferroboron alloy, applied in the field of ferroalloy, can solve the problems of high carbon content, low recovery rate of alloy elements, large segregation of alloy components, etc. in ferroboron alloy, and achieve the effect of lowering melt temperature, energy consumption and viscosity

Active Publication Date: 2017-11-07
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method uses iron fine powder or boron fine powder balls or mixed boron ferro fine powder balls, petroleum coke, and wood chips to smelt in a submerged arc furnace to obtain ferroboron. This method has high energy consumption and high carbon content in the produced ferroboron alloy.
[0003] Based on the shortcomings of low recovery rate of alloy elements and large segregation of alloy components in the current preparation process of ferro-boron alloy, the present invention proposes a new method for preparing ferro-boron alloy based on thermite self-propagating gradient feeding and slag washing and refining

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A method for preparing boron-iron alloys based on thermite self-propagating gradient reduction and slag washing refining, specifically comprising the following steps:

[0055] Step 1: Material pretreatment

[0056] The aluminothermic self-propagating reaction raw materials were pretreated separately, specifically boric anhydride was roasted at 150°C for 72h, Fe 2 o 3 The powder was calcined at 200°C for 12h, and the CaO was calcined at 400°C for 20h to obtain the pretreated aluminothermic self-propagating reaction raw material;

[0057] According to the proportioning ratio, weigh the pretreated thermitic self-propagating reaction raw materials, by mass ratio, boric anhydride: Fe 2 o 3 Powder: aluminum powder: CaO=1.0:2.73:1.7:1.12;

[0058] Among the raw materials for the aluminothermic self-propagating reaction, the particle size of each raw material is: boric anhydride ≤ 2mm; aluminum powder particle size ≤ 2mm; Fe 2 o 3 Powder≤0.2mm; CaO particle size≤0.2mm;

...

Embodiment 2

[0074] A method for preparing boron-iron alloys based on thermite self-propagating gradient reduction and slag washing refining, specifically comprising the following steps:

[0075] Step 1: Material pretreatment

[0076] The aluminothermic self-propagating reaction raw materials were pretreated separately, specifically boric anhydride was roasted at 150°C for 72h, Fe 2 o 3 The powder was calcined at 200°C for 12h, and the CaO was calcined at 400°C for 20h to obtain the pretreated aluminothermic self-propagating reaction raw material;

[0077] According to the proportioning ratio, weigh the pretreated thermitic self-propagating reaction raw materials, by mass ratio, boric anhydride: Fe 2 o 3 Powder: aluminum powder: CaO=1.0:2.71:1.9:1.43;

[0078] Among the raw materials for the aluminothermic self-propagating reaction, the particle size of each raw material is: boric anhydride ≤ 2mm; aluminum powder particle size ≤ 2mm; Fe 2 o 3 Powder≤0.2mm; CaO particle size≤0.2mm;

...

Embodiment 3

[0094] A method for preparing boron-iron alloys based on thermite self-propagating gradient reduction and slag washing refining, specifically comprising the following steps:

[0095] Step 1: Material pretreatment

[0096] The aluminothermic self-propagating reaction raw materials were pretreated separately, specifically boric anhydride was roasted at 150°C for 72h, Fe 2 o 3 The powder was calcined at 200°C for 12h, and the CaO was calcined at 400°C for 20h to obtain the pretreated aluminothermic self-propagating reaction raw material;

[0097] According to the proportioning ratio, weigh the pretreated thermitic self-propagating reaction raw materials, by mass ratio, boric anhydride: Fe2 o 3 Powder: aluminum powder: CaO=1.0:2.82:2.0:1.68;

[0098] Among the raw materials for the aluminothermic self-propagating reaction, the particle size of each raw material is: boric anhydride ≤ 2mm; aluminum powder particle size ≤ 2mm; Fe 2 o 3 Powder≤0.2mm; CaO particle size≤0.2mm;

[...

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Abstract

The invention relates to a method for preparing ferroboron based on a thermit self-propagating gradient reduction and slag-washing refining, and belongs to the technical field of ferroalloy. The method comprises the steps that after raw materials are preprocessed, by mass, 1.0 part of boric anhydride, 1.33-4.49 parts of Fe2O3 powder, 1.22-2.29 parts of aluminum power and 0.6-3.2 parts of CaO are weighed; then a thermit self-propagating reaction is conducted by adopting the mode of gradient feeding to obtain high temperature molten liquid, and gradient reduction smelting is conducted; after feeding is completed, thermal-insulation melt separation is conducted; and CaO-CaF2 base refining slag is added into the high temperature molten liquid, and the ferroboron is obtained after slag is removed. The gradient-feeding method achieves controlling over the reaction process and the temperature and thorough reducing of metallic oxides, and moreover, the smaller the gradients of the aluminum coefficients are, the fewer aluminum residues in the alloy molten liquid are; slag-washing refining achieves thorough chemical reaction of a slag-metal interface and slag-metal separation, and the recovery rate of boron is enhanced; and meanwhile, the temperature of the molten liquid is reduced, the system reaction heat is utilized, and energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of ferroalloys, in particular to a method for preparing boron-iron alloys based on thermite self-propagating gradient reduction and slag washing and refining. Background technique [0002] Ferroboron is one of the important ferroalloys in the iron and steel industry. It is a strong deoxidizer and boron additive in steelmaking production. Adding 0.07% B to steel can significantly improve the hardenability of steel. Adding boron element to 18% Cr, 8% Ni stainless steel can make precipitation hardening and improve high temperature strength and hardness. Therefore, ferroboron can be used in alloy structural steel, spring steel, low-alloy high-strength steel, heat-resistant steel, stainless steel, etc. In addition, boron can improve toughness and wear resistance in cast iron, and is widely used in the manufacture of automobiles, tractors, and machine tools. At present, low aluminum and low carbon ferroboron are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/076C22C35/00C22C38/32C22C38/06C22C38/02
CPCC21C7/0087C21C7/076C22C33/04C22C35/005C22C38/02C22C38/06C22C38/32Y02P10/20
Inventor 豆志河张廷安刘燕程楚吕国志潘喜娟赵秋月牛丽萍傅大学张伟光
Owner NORTHEASTERN UNIV
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