Preparing method for direct reduced iron using low grade high phosphorus iron ore as raw materials

A low-grade, reduced iron technology, applied in fluidized bed furnaces and other directions, can solve problems such as high energy consumption, waste, and high manufacturing costs, and achieve the effect of reducing production and operation costs

Active Publication Date: 2012-07-11
辽宁瑞凡冶金科技有限公司
View PDF3 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the previous direct reduction production mode, the raw materials were mainly produced by imported lump ore and iron concentrate powder with rolled steel scale or TFe≥66%, which is under the circumstance that the price of imported iron ore remains high at present. , which undoubtedly increases the high manufacturing cost and affects the competitiveness of this technology. On the other hand, China is a country rich in low-grade iron ore resources, and low-grade iron ore resources account for 90% of the total iron ore resources. As mentioned above, using the traditional blast furnace ironmaking method, if we want to continue to ensure the blast furnace concentrate, it wi

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparing method for direct reduced iron using low grade high phosphorus iron ore as raw materials
  • Preparing method for direct reduced iron using low grade high phosphorus iron ore as raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The coal-based tunnel kiln is used as the main equipment, and the oolitic structure hematite in the refractory ore is used as the raw material. The ore grade is 40.71%, and the sulfur content is 0.50%; the phosphorus content is 0.62%. The specific composition is shown in the table below:

[0015] name

TF

S

P

SiO 2

Al 2 o 3

CaO

MgO

oolitic hematite

40.71

0.50

0.62

34.04

3.34

2.76

1.14

[0016] The technical scheme of the invention is used to carry out direct reduction to prepare high-quality low-sulfur and phosphorus-reduced iron. Its production process mainly includes:

[0017] (1) ore crushing, the oolitic structure hematite ore is crushed to a fineness of less than 1mm to obtain iron ore powder;

[0018] (2) Add coal powder and additives, and add coal powder and additives with a fineness of -80 to -200 mesh into the iron ore powder, and the proportion is by mass per...

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

No PUM Login to view more

Abstract

Disclosed is a preparing method for direct reduced iron using low grade difficult-to-reduce high phosphorus iron ore as raw materials. The preparing method includes crushing ferric oxide iron ore to a granularity of 0-1mm so as to produce iron ore fines; mixing the iron ore fines, pulverized coals and auxiliaries sufficiently in a ratio of (80-84): (6-9) : (8-12) by mass percentage, to produce a pellet with a diameter of about 8-16mm, placing the pellet in a reduction kiln, subjecting the pellet to a reducing reaction in a reducing atmosphere at a temperature ranging from 1180 DEG C to 1350 DEG C for 3-8 hours to produce a metallized pellet, and performing crushing, magnetic separation and separation. By means of the preparing method, not only the direct reduced iron with low sulphur and phosphorus indexes can be obtained, but also various high-sulfur iron ore and low-poor-dull-phosphorus iron ore with a total Ferrum (TFe) <=40% can be used effectively, and production operating cost can be remarkably reduced.

Description

technical field [0001] The invention relates to a method for preparing direct-reduced iron by using low-grade, high-phosphorus, refractory iron ore as raw material. Background technique [0002] Direct reduction technology is a strategic emerging industry developed for the 21st century. Compared with traditional blast furnace ironmaking, it has the advantages of less investment and quick results. It is in a stage of rapid development in China. Metallized balls produced by direct reduction technology Squid or sponge iron has a single composition and few harmful elements. It is a high-quality raw material to replace high-quality scrap steel for steelmaking or casting, and is widely welcomed by the market. However, in the previous direct reduction production mode, the raw materials were mainly produced by imported lump ore and iron concentrate powder with rolled steel scale or TFe≥66%, which is under the circumstance that the price of imported iron ore remains high at present. ...

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
IPC IPC(8): C21B13/00
Inventor 陶立群唐竹胜
Owner 辽宁瑞凡冶金科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap