Agglomerated Material Strength via Carbohydrate Binder Aging
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Solution Overview
Problem
Existing methods for producing agglomerated materials for metallic iron in moving hearth-type reducing furnaces face challenges in achieving high mechanical strength without increasing binder and moisture content, leading to reduced production efficiency and increased costs.
Innovation Solution
Using a carbohydrate as the binder and allowing the material mixture to age before agglomeration, which increases the mechanical strength of the agglomerated material without increasing binder or moisture content, while employing a polysaccharide like starch and optimizing the blending ratio and standing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the moisture content is increased to improve formability, then the ease of manufacture is improved, but the strength of the compact deteriorates and the drying time is elongated
Solution Approach 1:
The material mixture is subjected to preliminary aging before agglomeration, allowing the binder to pre-condition and strengthen the particle bonds. This preliminary action enables the use of lower moisture content while maintaining formability, as the aged binder provides enhanced bonding capability during the agglomeration process.
Solution Approach 2:
The invention changes the temporal parameter by introducing an aging period before agglomeration. This parameter change allows the binder properties to evolve, improving bonding strength without requiring increased moisture content, thereby resolving the contradiction between formability and compact strength.
2Strength
If the binder content is increased to improve the strength of agglomerated material, then the strength is improved, but the raw-material cost increases and the production efficiency decreases
Solution Approach 1:
By applying preliminary aging to the material mixture before agglomeration, the binder undergoes conditioning that enhances its bonding effectiveness. This allows achieving high compact strength with reduced binder content, thereby improving production efficiency and reducing raw-material costs while maintaining the required strength of agglomerated material.
Solution Approach 2:
The binder serves itself by undergoing aging that automatically enhances its bonding properties. This self-improvement of binder performance eliminates the need for increased binder content or moisture addition, maintaining strength requirements while improving productivity and reducing costs.
3Strength
If the binder content is increased to improve the strength, then the strength is improved, but the relative content of moisture decreases causing deterioration of formability
Solution Approach 1:
The preliminary aging of the material mixture before agglomeration enhances binder performance, allowing the system to maintain formability even with reduced moisture content associated with higher binder levels. The aged binder compensates for the reduced moisture availability, ensuring proper agglomeration occurs.
Solution Approach 2:
The introduction of an aging time parameter transforms the binder's functional properties, enabling it to maintain effective bonding at lower moisture contents. This parameter change resolves the contradiction by allowing higher binder content to be used without sacrificing formability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enhances the mechanical strength of agglomerated materials, reducing the need for high binder content and minimizing moisture, thereby improving production efficiency and reducing costs while maintaining high mechanical properties.
Implementation Method 1
a carbohydrate is used as the binder
Implementation Method 2
drying the material mixture
Data Source
AI summary
A method is provided for producing an agglomerated material that is used for producing metallic iron by heat reduction in a moving hearth-type reducing furnace, wherein the agglomerated material can have a high mechanical strength without increases in the binder content and the moisture content of the material mixture. The method for producing an agglomerated material used for producing metallic iron, wherein the agglomerated material is produced by agglomerating a material mixture containing an iron-oxide-containing material, a carbonaceous reducing agent, a binder, and moisture; drying the material mixture; and charging and heating the material mixture in a moving hearth-type reducing furnace to reduce the iron oxide contained in the material mixture with the carbonaceous reducing agent, wherein a carbohydrate is used as the binder and the material mixture is left to stand prior to the agglomeration.