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thermal treatment process in iron ore green pellet

Iron Ore Pelletizing Process: An Overview IntechOpen

10/07/2017 Induration process: the green pellets are hardened in a high temperature processing at controlled heating rates, and aiming to achieve the physical and metallurgical requirements for handling, transportation, and final application. This chapter aims to provide an overview and the evolution of iron ore pelletizing process including: Pelletizing process

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Effective Use of Available Heat for Maintaining a High

KEY WORDS: green pellet temperature; process integration; optimization; straight-grate induration furnace; preheating; pelletizing; waste heat utilization. 1. Introduction LKAB (Luossavaara-Kiirunavaara Aktiebolag) is a Swedish mining company and one of the world’s leading producers of upgraded iron ore products for the steel indus-try. LKAB have six operation facilities for iron ore pellet

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(PDF) Iron Ore Pelletizing Process: An Overview

09/11/2020 the heat. The green pellets are then charged on top of the hearth of indurated pellets. A . schematic diagram of this process is shown in Figure 7. The process is designed to enhance heat

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Electrification of the heat treatment process for iron ore

The two most common processes for heat treatment are called the grate-kiln and straight-grate processes. The grate-kiln process uses a travelling grate for drying, preheating and cooling and a rotating kiln for sintering, while the straight-grate uses a travelling grate for the entire process.

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Improvement on the thermal cracking performance of pellets

The thermal state of iron ore pellets during traveling-grate processes is complex, and sintering is a complex coupling process involving multiple physical factors. In this study, the temperature

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Breakage of green iron ore pellets ScienceDirect

15/04/2020 Size of the fired iron ore pellets is a critical variable throughout the process, being normally controlled between about 8 and 18 mm using roller screens in the green pellet area [ 4] and vibrating screens after induration [ 1 ].

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Pellet Process Uses and Exposures May 2010

Induration, which means thermal treatment, consisting of drying, heating and cooling. It can be carried out by using two different systems; in ‘straight grate’ or ‘grate kiln’ systems. During thermal treatment magnetite is almost completely oxidised to hematite. This contributes to the large amounts of heat needed to operate the process. Handling & Screening At the end of the

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Green Pellet an overview ScienceDirect Topics

01/01/2012 In Grate-Kiln process, green pellets are fed on oil or gas-fired endless Straight Grate machine where they are dried and preheated. The preheated pellets are then fed to a rotary kiln where their temperature is raised in oxidizing atmosphere to 1290–1400 °C. In induration, ore grains are sintered together with oxidation and slag-forming bonds.

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Iron Ore Pelletizing Process: An Overview IntechOpen

10/07/2017 Induration process: the green pellets are hardened in a high temperature processing at controlled heating rates, and aiming to achieve the physical and metallurgical requirements for handling, transportation, and final application. This chapter aims to provide an overview and the evolution of iron ore pelletizing process including: Pelletizing process

get price

Electrification of the heat treatment process for iron ore

over 27.2 million ton iron ore products and iron ore pellets accounted for around 83 % of LKAB’s iron ore deliveries. [4] As one of the largest industries in Sweden, operating several pellet plants, LKAB contributes significantly to greenhouse gas emissions. Due to this, LKAB is examining different methods to reduce their climate impact

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The role of thermal improvements in indurating machines

The oxidation phenomenon and sulfur removal, in the magnetite iron ore pellets, were assessed by determination of appropriate thermal conditions employing thermogravimetric as well as differential...

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Effective Use of Available Heat for Maintaining a High

KEY WORDS: green pellet temperature; process integration; optimization; straight-grate induration furnace; preheating; pelletizing; waste heat utilization. 1. Introduction LKAB (Luossavaara-Kiirunavaara Aktiebolag) is a Swedish mining company and one of the world’s leading producers of upgraded iron ore products for the steel indus-try. LKAB have six operation facilities for iron ore pellet

get price

Pellet Process Uses and Exposures May 2010

Induration, which means thermal treatment, consisting of drying, heating and cooling. It can be carried out by using two different systems; in ‘straight grate’ or ‘grate kiln’ systems. During thermal treatment magnetite is almost completely oxidised to hematite. This contributes to the large amounts of heat needed to operate the process. Handling & Screening At the end of the

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Influence properties the pelletizing process—A review

Iron ore Pelletizing Binder Dispersant a b s t r a c t The use of binders for iron ore pelletizing is required to: (a) increase the pellet strength before heating green strength; (b) prevent the collapse of the pellets during firing, when the gases generated by water vaporization

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Pelletizing Wikipedia

The process of pelletizing combines mixing of the raw material, forming the pellet and a thermal treatment baking the soft raw pellet to hard spheres. The raw material is rolled into a ball, then fired in a kiln or in travelling grate to sinter the particles into a hard sphere.

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SAFETY GUIDELINES FOR IRON & STEEL SECTOR MINISTRY OF

2) Pre-treatment 3) Additive and Binder proportionating and Mixing 4) Balling 5) Indurating 6) Pellet screening /HL Segregation 2.1 Process of receiving raw material The location of a pelletizing plant affects the method of receiving raw materials such as iron ore, additives and binders. 2.2.1 Pre-treatment process of Iron Ore Fines

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OUTOTEC TRAVELING GRATE PELLETIZING

The green pellets are then screened and heat-hardened in the indurating furnace. The process comprises four steps: • Raw material preparation and mixing • Green pelletizing • Pellet hardening (indurating) • Hearth layer and product screening In order to adjust the moisture content, water is added in the mixing step. The ore is then mixed with small amounts of binding agents, which give

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SINTERING AND PELLETISATION OF INDIAN IRON ORES

No losses in handling iron ore as pellets will not break during transport or handling. 9. TYPES OF PELLETISATION PROCESS 1. Grate kiln process 2. Travelling grate process. Choice of one over the other will be based more on economics rather than the technical aspects 10. GRATE KILN PROCESS Process adopts three equipment viz. grate, rotary kiln and annular cooler. Green balls are first dried

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Effective Use of Available Heat for Maintaining a High

KEY WORDS: green pellet temperature; process integration; optimization; straight-grate induration furnace; preheating; pelletizing; waste heat utilization. 1. Introduction LKAB (Luossavaara-Kiirunavaara Aktiebolag) is a Swedish mining company and one of the world’s leading producers of upgraded iron ore products for the steel indus-try. LKAB have six operation facilities for iron ore pellet

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The Feasibility of Replacing Coal with Biomass in Iron-Ore

The pelletizing process is a combination of blending of the raw material, rolling the pellets into a ball (spheres), and a thermal treatment sintering step to harden the soft raw pellets in a kiln or on a traveling grate. During the grate-kiln process, which is the focus of the present work, the green pellets

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Magnetite oxidation in North American iron ore pellet

Hardening of pellets: Oxidizing heat treatment, heated from room temperature to 1350°C, then cooled; reaction 2Fe3O4+ O 2 → 3Fe2O3 Processes: Grate-kiln-cooler; straight-grate green pellets grate kiln Grate-kiln process (Forsmo, 2007) indurated pellets cooler

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SAFETY GUIDELINES FOR IRON & STEEL SECTOR MINISTRY OF

2) Pre-treatment 3) Additive and Binder proportionating and Mixing 4) Balling 5) Indurating 6) Pellet screening /HL Segregation 2.1 Process of receiving raw material The location of a pelletizing plant affects the method of receiving raw materials such as iron ore, additives and binders. 2.2.1 Pre-treatment process of Iron Ore Fines

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Porosity Characterization of Iron Ore Pellets by X-Ray

They are produced from ore fines in a process called pelletizing, which consists of two basic steps; the first is the formation of the soft green pellet from the iron ore fines and the second step requires a heat treatment to harden the pellet, which in its green state does not have sufficient physical resistance for the steelmaking process1. The final pelletized product must be a porous

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LI Metal Bulletin

technologies applied in the last four (4) decades into the iron ore process agglomeration green pellet production and their further heat hardening to produce high-quality fired pellets. These statements are based on the successful experience of operating pellet plants with high productivity, producing DR grade pellets that’s comply with the internal quality criteria for captive

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green iron ore pellets for sintering

Iron-process sintering of iron ores. 2 Ishara JessieCompared with sintered ore, pellets have a higher iron- and a lower gang- content, and.Influence of Green Pellet Properties on Pelletizing of Magnetite Iron. Magnetite iron ore green pellets are produced by balling moist concentrates to green...

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Recent technological advancements in high capacity pellet

Market leader and capable of handling all types of iron ore Determination of required green pellet moisture level Determination of achievable grate factor (specific capacity) and pellet quality Determination of design data for the indurating machine, especially its firing and cooling zones 18 April 2013 Recent technological advancements in high capacity pellet plants 86th Annual Meeting of

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US6241808B1 Production of iron ore pellets Google Patents

A process for producing fired pellets by granulating finely-ground iron ore and subjecting the resulting granules sequentially to drying, dehydration, preheating, and firing, wherein said process...

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Direct reduced iron Wikipedia

In both cases, the objective of the process is to drive off the oxygen contained in various forms of iron ore (sized ore, concentrates, pellets, mill scale, furnace dust, etc.), in order to convert the ore to metallic iron, without melting it (below 1,200 °C (2,190 °F)). The direct reduction process is

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