Industrial preparation method of high-fine-powder-rate ore agglomerates

A high-fine powder, man-made technology, applied in the field of iron and steel metallurgy, can solve the problems affecting the air permeability of the sintered material layer, high fine powder rate of sintered iron material, and affecting sintering production, etc.

Inactive Publication Date: 2013-09-18
INNER MONGOLIA BAOTOU STEEL UNION
View PDF2 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the ensuing problem is that the fine powder rate in the sintered iron material is high, which affects the air permeability in the sintered material layer and affects the sintering production.

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

[0013] Baotou Steel two 265m 2 Sintering machine, material layer thickness is 700mm. Under the condition of the same alkalinity (2.0) and MgO content (2.4) of the finished ore, when this method is adopted and the ratio of green balls is controlled at 20%~26%, compared with the conventional sintering process, the iron-containing raw materials can be The proportion of medium iron concentrate is increased by 10-15 percentage points on the basis of 60%-62%, and the proportion of ultra-fine iron concentrate (-300 mesh reaches 75%-80%) in iron-containing raw materials can reach 30% ~45%. At the same time, the air permeability of the sintering material layer did not deteriorate, the speed of the sintering machine increased from 2.2m / min before the implementation to 2.3m / min after the implementation, and the negative pressure of the main pipe decreased from 14.52 kpa before the implementation to 14.11 kpa after the implementation; After this method, the unit-hour output reaches 320 ...

Embodiment 2

[0015] One Baotou Steel 265 m 2 Sintering machine, material layer thickness 700mm. The method is adopted to produce artificial lump ore with an alkalinity of 1.5-1.6. Under the condition of the same type and proportion of iron materials, when the proportion of green pellets reaches 40~48%, compared with the sintered ore with a basicity of 2.0 produced by the conventional sintering process, after the implementation, the output per unit hour reaches 313.24 t / h, utilization factor 1.182 t / m 2 .h, 6.9% higher than before implementation; fuel consumption decreased by 2~3 kg / t; drum strength index of finished ore was 73%~75%, 1.5~2.0% lower than before implementation; sinter grade was 57%~ 58%, an increase of 0.3-0.5 percentage points compared with before implementation, and the metallurgical properties of the finished ore under this basicity condition can still maintain the metallurgical properties of the high-basic sintered ore produced by the conventional sintering process, and...

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
strengthaaaaaaaaaa
Login to view more

Abstract

The invention relates to an industrial preparation method of high-fine-powder-rate ore agglomerates. The industrial preparation method is characterized by comprising the following steps of: uniformly mixing a ferrous raw material with bentonite which accounts for 2-6 weight percent of the ferrous raw material to prepare acidic fresh pellets, wherein the particle size of the fresh pellets is 4-10mm; uniformly mixing and granulating raw materials including iron ore concentrates or a mixture of the iron ore concentrates and superfine iron ore concentrates, imported iron ore powder, limestone, light-burned dolomite, quicklime and high-alkalinity sintering mixture of fine coke in a primary mixer and a secondary mixer granulator, and adding the acidic fresh pellets to form an acid-alkali mixture before the materials are put into a distributing belt of a sintering machine, wherein the added amount of the fresh pellets accounts for 20-60 weight percent of the externally distributed high-alkalinity sintering mixture; and distributing the acid-alkali mixture to a trolley of the sintering machine through a swinging belt, a wide belt and a nine-roller distributor, and igniting and roasting to obtain high-quality ore agglomerates. The industrial preparation method has the advantage that the problems of poor air permeability and sintering difficulty during sintering of high-precision powder and in the sintering process of the ferrous raw material containing superfine concentrates are solved.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a method for preparing artificial agglomerate for blast furnace ironmaking under the condition of high fine powder rate. Background technique [0002] In recent years, with the rapid development of the iron and steel industry, the demand for iron ore has continued to increase, resulting in rising iron ore market prices and tight supply at home and abroad. Therefore, many iron and steel enterprises have to develop new iron ore resources. To alleviate the rise in steel costs. While Baotou Steel has a pig iron production capacity of 10 million tons, it is also actively developing self-produced iron ore resources with relatively low prices to reduce ironmaking costs. Baotou Steel's self-produced iron concentrate has a finer particle size than the domestic ordinary concentrate, with -200 mesh accounting for more than 90%, especially the newly developed ultra-fine iron concentra...

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 Applications(China)
IPC IPC(8): C22B1/14C22B1/243C21B5/00
Inventor 陈革王瑞军吕志义康文革白晓光汪俊玲王鑫王敏李玉柱付国伟孙睿刘周利
Owner INNER MONGOLIA BAOTOU STEEL UNION
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