Sorbent Preparation Core-Shell Structure for Mercury Removal
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Solution Overview
Problem
Conventional copper sorbents used for removing heavy metals from fluid streams face challenges in physical properties such as attrition, which affect their performance in more demanding applications.
Innovation Solution
A method involving the preparation of sorbent precursors by mixing inert particulate support materials with binders, shaping into agglomerates, coating with a copper compound and binders, and drying, followed by sulphiding to enhance the sorbent's physical properties and mercury removal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional precipitation and granulation methods are used to prepare copper sorbents, then the sorbents achieve sufficient copper content, but their physical properties such as attrition resistance deteriorate
Solution Approach 1:
The sorbent is segmented into a core structure (inert support material agglomerates) and a surface layer (copper compound coating). This segmentation allows the core to provide mechanical strength and attrition resistance while the surface layer provides the necessary copper content for heavy metal removal, resolving the contradiction between copper content and physical strength.
Solution Approach 2:
The invention uses composite materials by combining inert support materials (such as alumina, silica, or carbon) with copper compounds in a core-shell structure. The inert core provides structural integrity and resistance to attrition, while the copper-containing coating layer provides the chemical functionality for sorption, thus achieving both high attrition resistance and sufficient copper content.
2Strength
If copper content is reduced in sorbent formulations, then attrition resistance improves, but mercury removal efficiency deteriorates
Solution Approach 1:
The copper compound is concentrated in the surface coating layer rather than being distributed throughout the entire sorbent particle. This local quality approach ensures that the copper is positioned exactly where it is needed - at the surface for contact with heavy metals in the fluid stream - while the bulk of the particle consists of inert material providing strength and attrition resistance.
Solution Approach 2:
The inert support material in the core structure typically has porous characteristics that increase the surface area available for copper compound deposition. This porous structure allows sufficient copper content to be achieved in the coating layer without increasing the overall particle size or compromising attrition resistance, maintaining both mechanical strength and sorption efficiency.
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 produces sorbents with improved attrition resistance and mercury capture efficiency, matching or exceeding conventional granulated materials despite lower copper content, effectively removing mercury and other heavy metals from fluid streams.
Implementation Method 1
The invention further provides a method for preparing a sorbent comprising the step of sulphiding the sorbent precursor with one or more sulphur compounds
Implementation Method 2
Copper sulphide containing sorbents may be used to remove heavy metals from fluid streams
Implementation Method 3
By 'sorbent' we include absorbent and adsorbent
Data Source
AI summary
A method for preparing a sorbent precursor, which may be sulphided and used to remove heavy metals such as mercury from fluid streams, includes the steps of:(i) mixing together an inert particulate support material and one or more binders to form a support mixture,(ii) shaping the support mixture by granulation in a granulator to form agglomerates,(iii) coating the agglomerates with a coating mixture powder including a particulate copper compound and one or more binders to form a coated agglomerate, and(iv) drying the coated agglomerate to form a dried sorbent precursor.