High sulfide pyrite pellet reinforced roasting consolidation technology

A technology of high pyrite and high pyrite concentrate, applied in blast furnaces, blast furnace details, furnaces, etc., can solve the problem of dew point corrosion of low temperature exhaust gas, difficult removal of sulfur elements, affecting the oxidizing property, strength and consolidation speed of pellets and other problems, to achieve the effect of equipment corrosion elimination, corrosion elimination, and stable production operation.

Active Publication Date: 2011-11-16
CENT SOUTH UNIV +1
View PDF3 Cites 33 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using high-sulfur iron concentrate (S ≥ 0.5%) to make pellets, there will be three technical difficulties in the oxidation roasting process. First, the sulfur element in the form of sulfate is not easy to remove under the conventional roasting atmosphere. ; Second, during the roasting process of high-sulfur green pellets, the oxidation and removal of sulfur will affect the oxidation, strength and consolidation speed of the pellets; third, the roasting flue gas of high-sulfur iron concentrate pellets will contain higher Concentration of SO 2 and SO 3 , the problem of dew point corrosion of low-temperature exhaust gas and the problem of flue gas desulfurization of large volumes are also difficult to solve
Therefore, the three problems existing in the roasting of high-sulfur iron concentrate pellets have always been the bottleneck restricting the diversification of pellet raw materials

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
  • High sulfide pyrite pellet reinforced roasting consolidation technology
  • High sulfide pyrite pellet reinforced roasting consolidation technology
  • High sulfide pyrite pellet reinforced roasting consolidation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Using high-sulfur iron concentrate (sulfur containing 1.5%) and sulfuric acid slag as raw materials, when the pellet mixture (40% high-sulfur iron concentrate + 60% sulfuric acid slag) contains as high as 1% sulfur, conventional pellet production Process, the strength of the finished pellet is lower than 2100N, and the finished pellet contains 0.32% sulfur. The present invention pre-wet sulfuric acid slag to water content of 14%, mix with high-sulfur iron ore (60:40), pass through high-pressure roller mill, and then mix with 1.0% organic compound bentonite and 1% magnesite, and mix it evenly. After the pellets, drying, preheating, roasting and cooling, the high-pyrite pellets are roasted, the finished pellets contain 0.018% sulfur and the compressive strength reaches 2680N, which meets or exceeds the industry standard of the first grade acid iron pellets. The system produces 1.2 million tons of iron oxide pellets annually. Corrosion of system equipment is basically elim...

Embodiment 2

[0045] Using high-sulfur iron concentrate (2% sulfur) and sulfuric acid slag as raw materials, when the pellet mixture (20% high-sulfur iron concentrate + 80% sulfuric acid slag) contains as high as 1% sulfur, conventional pellet production Process, the strength of the finished pellet is lower than 1900N, and the finished pellet contains 0.33% sulfur. The present invention pre-wet sulfuric acid slag to 15% water content, mix it with high-sulfur iron ore (80:20), then pass through high-pressure roller mill, and then mix with 1.0% organic compound bentonite and 1% magnesite, and mix it evenly. After the pellets, drying, preheating, roasting and cooling, the high-pyrite pellets are roasted, the finished pellets contain 0.015% of sulfur, and the compressive strength reaches 2590N. The system produces 1.2 million tons of iron oxide pellets annually. Corrosion of system equipment is basically eliminated, and production runs stably.

Embodiment 3

[0047] Using high-sulfur iron concentrate (sulfur 2%) and sulfuric acid slag as raw materials, the conventional pellet production process when the pellet mixture (10% high-sulfur iron concentrate + 90% sulfuric acid slag) contains 0.9% sulfur , The strength of the finished pellets is lower than 1850N, and the finished pellets contain 0.31% sulfur. The present invention pre-wet sulfuric acid slag to water content of 16%, mix it with high-sulfur iron ore (90:10), pass through high-pressure roller mill, then mix with 1.0% organic compound bentonite and 1% magnesite, and mix it evenly. After spheronizing, drying, preheating, roasting and cooling to strengthen the roasting of high pyrite pellets, the finished pellets contain 0.018% sulfur and the compressive strength reaches 2530N. The system produces 1.2 million tons of iron oxide pellets annually. Corrosion of system equipment is basically eliminated, and production runs stably.

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 discloses a high sulfide pyrite pellet reinforced roasting consolidation technology. Pellets are produced by adopting the technology of drying grate--rotary kiln--ring type refrigeration machine--flue gas desulphurization. The basic flow is as follows: prebatching--mixing--high press roll grinding--batching--mixing--pelletizing--drying--preheating--roasting--cooling--finished product output--flue gas desulphurization. From the perspectives of the occurrence state of sulfur in raw materials, the decomposition behavior of sulfur during the heating process, the iron ore pellet forming theory and the iron ore pellet consolidation mechanism, the system integration reinforced high sulfide pyrite pellet forming and pellet consolidating technology, which includes the improvement of pyritic slag pellet forming dynamics condition, the reinforcement of high sulfur pellet desulphurization and consolidation during the preheating and roasting processes and the control of high SO2 concentration flue gas features and migration rules, is adopted to solve the roasting problem of high sulfide pyrite, make the sulfur content of the finished pellets and the pellet ore strength reach related technical requirements and basically prevent flue gas from corroding equipment. The invention provides a new approach for effective utilization of high sulphur-containing iron concentrate and sulfuric acid slag resource.

Description

Technical field [0001] The invention relates to a process for roasting and consolidation of pellets, in particular to a process for enhanced roasting and consolidation of high-pyrite iron ore pellets. Background technique [0002] In recent years, with the rapid development of my country's pelletizing industry, iron ore concentrate resources at home and abroad are becoming increasingly scarce. The use of high-sulfur iron concentrate and sulfuric acid slag to produce iron ore pellets has attracted increasing attention. Generally, in the production of iron ore pellets, the sulfur content of the incoming raw materials is required to be as low as possible. When high-pyrite iron concentrate (S≥0.5%) is used to make pellets, there will be three technical problems in the oxidative roasting process. One is that sulfur in the form of sulfate is not easy to remove under conventional roasting atmosphere. ; Second, during the roasting process of high-sulfur green pellets, the oxidative rem...

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): C22B1/14C21B5/00
Inventor 朱德庆徐五七潘建左永伟李启厚李要武蓝庆滔王爱民唐达高陈家欢
Owner CENT SOUTH UNIV
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