Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing boron-iron alloy based on thermite 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: 2019-02-05
NORTHEASTERN UNIV LIAONING
View PDF6 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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;

[...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

A method for preparing boron ferroalloy based on aluminothermic self-propagating gradient reduction and slag washing refining, belonging to the technical field of ferroalloys. In this method, after the raw materials are pretreated, they are weighed according to the mass ratio, boron anhydride: Fe2O3 powder: aluminum powder: CaO = 1.0: (1.33~4.49): (1.22~2.29): (0.6~3.2), and then gradient feeding is used. The aluminothermic self-propagation reaction is carried out to obtain a high-temperature melt, and gradient reduction smelting is performed. After the feeding is completed, the heat preservation and melting is carried out. CaO-CaF2-based refining slag is added to the high-temperature melt. After slag removal, a boron-iron alloy is obtained. This gradient feeding method achieves control of the reaction process and temperature and complete reduction of metal oxides, and the smaller the gradient of the aluminum coefficient, the lower the aluminum residue in the alloy melt. This slag washing and refining realizes the thorough chemical reaction at the slag-gold interface and the separation of slag-gold, improves the boron recovery rate, and at the same time reduces the melt temperature, utilizes the reaction heat of the system, and reduces energy consumption.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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 LIAONING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com