Process for manufacturing iron pellets from low-grade complex refractory ore through molten slag method

A difficult-to-handle, low-grade technology, applied in fluidized bed furnaces, etc., can solve problems such as low recovery rate, high cost, and environmental pollution, and achieve the effects of improving efficiency, improving grade and recovery rate, and increasing production capacity

Active Publication Date: 2012-01-25
TANGSHAN OUTSTANDING SCI & TECH
View PDF3 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

BACKGROUND OF THE INVENTION Coal-based direct reduction has been used, and various attempts have been made in the utilization of low-grade complex and refractory ores. Rotary hearth furnaces, rotary kilns, tunnel kiln processes, and shaft furnaces are all involved. Direct

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 Construction

[0011] The present invention will be further described below through embodiment.

[0012] In the embodiment, raw material ingredients: low-grade complex refractory ore is oolitic hematite (Fe=34%) with a particle size of 80 to 100 mesh, of which SiO 2 Content is 31%, Al 2 o 3 The content is 10%, the reducing agent carbon C processed from bituminous coal, the particle size after crushing is 80 mesh, and oolitic hematite is mixed with reducing agent (carbon C), slagging agent (calcium fluoride and sodium hydroxide) and metal The aggregating agent is mixed in proportion (oolitic hematite 1: reducing agent 0.2: calcium fluoride 0.027: sodium hydroxide 0.0039: metal aggregating agent 0.002) and then fully mixed into balls. After the balls are dried, mix with lime, reducing agent (carbon C) and Clay (pellet 1:lime 0.08:clay 0.25) is fully mixed to press bricks, the surface of the pressed bricks is sprayed with a layer of clay mud and placed on the trolley surface, enters the reduc...

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

The invention relates to a process for manufacturing iron pellets from low-grade complex refractory ore through the molten slag method, belonging to the field of direct reduction of metal metallurgy. The invention has the technical scheme that the process comprises the following steps of: fully mixing the low-grade complex refractory ore with a reducing agent and additives, pelletizing, drying the carbonic pellets, adding lime stone, coal dust and clay to mix, pressing the mixture into hollow or solid bricks, spraying clay slurry to the surfaces of the bricks, and loading the bricks into reduction equipment; discharging the reduced product, immediately cooling the product in a cooling protection chamber with reducing atmosphere, and pulverizing and sorting the cooled material product to obtain the raw material for steel making. The invention has the advantages that a slag forming agent promotes non-iron oxide gangue components to be quickly aggregated and remove metal element to form ore slag, and metal aggregation agent promotes oxidized metal metals to be quickly reduced and separate ore slag to form iron pellets. The material forming iron pellets can greatly improve the efficiency of subsequent ore grinding and magnetic separation procedures. By applying the process, the capacity of a single kiln can be increased to the maximum extent.

Description

technical field [0001] The invention relates to a process for producing granulated iron by the slag method of low-grade complex and refractory ore, which belongs to the field of direct reduction of metallurgy. Background technique [0002] At present, direct reduced iron is an urgently needed raw material for the production of high-quality pure steel for electric furnace steel in my country, and it is also an urgently needed raw material for the production of high-purity steel casting and forging blanks in my country's equipment manufacturing industry. At present, due to the increase in steel production capacity, the problem of raw materials is particularly prominent, and the utilization of low-grade complex and refractory ores has become a hot spot in the metallurgical industry. Low-grade complex and refractory ores include: ① oolitic hematite, hematite, specularite, limonite, siderite, antelope ore and other low-grade refractory ores, ② vanadium ilmenite, boronite , later...

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): C21B13/00C22B1/24C22B1/16
Inventor 汪翔宇王建春刘荣幸王传杰
Owner TANGSHAN OUTSTANDING SCI & TECH
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