Advanced

Optimization of biomass materials for use in the Sponge Iron Process

Hernebrant, Elin LU (2015) KOO920 20151
Centre for Analysis and Synthesis
Abstract
This master thesis was a project in cooperation with Höganäs AB. The aim was to increase the apparent density (AD) of two biomass chars, by three different agglomeration methods. The reason for the investigation is that biomass char could be used as a reducing agent in the sponge iron process at Höganäs AB. The goal was to exchange anthracite in the reduction mixture to agglomerated biomass char. Biomass char is a more environmentally friendly alternative to anthracite. The fact that the price of anthracite of good quality is also increasing, which makes it necessary to find an alternative material.

A characterization of the biomass chars was performed at first, where the specific surface area, higher heating value and composition of... (More)
This master thesis was a project in cooperation with Höganäs AB. The aim was to increase the apparent density (AD) of two biomass chars, by three different agglomeration methods. The reason for the investigation is that biomass char could be used as a reducing agent in the sponge iron process at Höganäs AB. The goal was to exchange anthracite in the reduction mixture to agglomerated biomass char. Biomass char is a more environmentally friendly alternative to anthracite. The fact that the price of anthracite of good quality is also increasing, which makes it necessary to find an alternative material.

A characterization of the biomass chars was performed at first, where the specific surface area, higher heating value and composition of the biomass chars were determined. Extrusion, tumble agglomeration and granulation in a planetary mixer were performed in order to increase the AD of the biomass chars. A binder was necessary in all agglomeration methods, which is why a preliminary binder investigation took place. Four different organic polymers and one inorganic binder have tested in this investigation. In order to see if the AD had increased and what properties that might have an effect on the AD, an evaluation of the agglomerates was performed. The evaluation included measuring the AD, determining the particle size distribution, moisture content and the reactivity of the agglomerates. The final experiments were made in a pilot scale process, which is similar to the sponge iron process, in order to see how an increase in AD could affect the reduction.

The agglomerates made in the extruder resulted in the highest AD. The result was expected since extrusion is a high-pressure method compared to the other methods. A surprising result was, however, the increase in reactivity of the agglomerates made in the extruder. The agglomerates made by tumble agglomeration and granulation decreased in reactivity. (Less)
Popular Abstract
Two biomass chars were compacted by extrusion, tumbling agglomeration and granulation. The goal was to increase the apparent density of the biomass chars for possible usage as reducing agent in the sponge iron process at Höganäs AB.
Please use this url to cite or link to this publication:
author
Hernebrant, Elin LU
supervisor
organization
course
KOO920 20151
year
type
H2 - Master's Degree (Two Years)
subject
keywords
materials chemistry, materialkemi
language
English
id
7760175
date added to LUP
2015-10-01 12:54:39
date last changed
2015-10-01 12:54:39
@misc{7760175,
  abstract     = {This master thesis was a project in cooperation with Höganäs AB. The aim was to increase the apparent density (AD) of two biomass chars, by three different agglomeration methods. The reason for the investigation is that biomass char could be used as a reducing agent in the sponge iron process at Höganäs AB. The goal was to exchange anthracite in the reduction mixture to agglomerated biomass char. Biomass char is a more environmentally friendly alternative to anthracite. The fact that the price of anthracite of good quality is also increasing, which makes it necessary to find an alternative material.
 
A characterization of the biomass chars was performed at first, where the specific surface area, higher heating value and composition of the biomass chars were determined. Extrusion, tumble agglomeration and granulation in a planetary mixer were performed in order to increase the AD of the biomass chars. A binder was necessary in all agglomeration methods, which is why a preliminary binder investigation took place. Four different organic polymers and one inorganic binder have tested in this investigation. In order to see if the AD had increased and what properties that might have an effect on the AD, an evaluation of the agglomerates was performed. The evaluation included measuring the AD, determining the particle size distribution, moisture content and the reactivity of the agglomerates. The final experiments were made in a pilot scale process, which is similar to the sponge iron process, in order to see how an increase in AD could affect the reduction.
 
The agglomerates made in the extruder resulted in the highest AD. The result was expected since extrusion is a high-pressure method compared to the other methods. A surprising result was, however, the increase in reactivity of the agglomerates made in the extruder. The agglomerates made by tumble agglomeration and granulation decreased in reactivity.},
  author       = {Hernebrant, Elin},
  keyword      = {materials chemistry,materialkemi},
  language     = {eng},
  note         = {Student Paper},
  title        = {Optimization of biomass materials for use in the Sponge Iron Process},
  year         = {2015},
}