Granular Activated Carbon via Calcium Composite Hardening
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Solution Overview
Problem
Existing methods for producing granular activated carbon lack the necessary hardness and pore distribution to effectively purify liquids and serve as catalyst supports, and they often rely on wood powder as a raw material, which is becoming scarce and difficult to utilize due to lumber resource conservation and dust generation issues.
Innovation Solution
A method involving the carbonization and steam activation of a calcium-containing mixture, followed by washing, to produce granular activated carbon with controlled micropore and mesopore ratios, achieving low impurity content, high hardness, and suitable pore volume, thereby overcoming the limitations of wood-based steam-activated carbons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wood powder is used as raw material for activated carbon production, then micropores and mesopores are well-balanced distributed and impurity content is low, but only powdered activated carbon can be obtained which causes dust generation and requires filtration for separation
Solution Approach 1:
The invention changes the physical form parameter of the raw material from powder to granular shape, and modifies the processing parameters by introducing calcium compounds and controlling carbonization/activation conditions. This allows obtaining granular activated carbon with well-balanced micropore and mesopore distribution while avoiding dust generation and filtration requirements
Solution Approach 2:
The invention creates a composite material system by combining carbonaceous raw material with calcium compounds (CaO, Ca(OH)2, CaCO3, or CaCl2) in specific ratios. This composite approach enables the formation of granular activated carbon with controlled pore structure and high hardness, resolving the contradiction between pore quality and granular form
2Ease of operation
If lumber is used as raw material and carbonized to form charcoal followed by steam activation, then granular form is obtained, but the resulting activated carbons are light and flexible and cannot be used as granular activated carbons
Solution Approach 1:
The invention changes the chemical composition parameters by introducing calcium compounds that form a rigid framework during carbonization. This chemical modification transforms the physical properties of the granular carbon, converting it from light and flexible to hard and structurally stable, suitable for industrial applications
Solution Approach 2:
By creating a composite of carbonaceous material with calcium compounds, the invention achieves a synergistic effect where the calcium-based additives provide structural rigidity and hardness to the granular form, while the carbonaceous matrix maintains the activated carbon functionality
3Quantity of substance
If wood powder is used as raw material, then activated carbon can be produced, but the yield is decreasing due to lumber resource conservation and alternative uses of wood powder
Solution Approach 1:
The invention broadens the scope of applicable raw materials from specifically wood powder to any carbonaceous material containing 50% or more carbon by weight. This universal approach allows utilization of various carbon-rich materials (coconut shells, bone, coal, etc.), increasing raw material availability and reducing dependency on wood resources
Solution Approach 2:
The invention changes the raw material selection criterion from specific material type (wood powder) to compositional parameter (carbon content ≥50%). This parameter-based approach enables flexible raw material selection and improves productivity by allowing use of abundant alternative carbonaceous materials
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 resulting granular activated carbon exhibits balanced pore distribution, low impurity content, and sufficient hardness, making it suitable for liquid purification and catalyst support applications, while avoiding the limitations of wood-based powdered activated carbons.
Implementation Method 1
mixing activated carbons with calcium, and molding the mixture, followed by carbonization, activation, and washing
Implementation Method 2
carbonizing and activating the mixture; activating a carbonaceous material with an oxidising gas such as steam
Implementation Method 3
Activated carbons are widely used as adsorbents, for example, to remove impurities or adjust the concentration of dissolved components
Data Source
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AI summary
Provided is a granular activated carbon that can be used for applications similar to wood-based steam-activated carbons; and also provided is a method for manufacturing the same. The granular activated carbon is obtained in the following manner. An activated carbon raw material is carbonized, and then pulverized. The pulverized product is then mixed with a calcium component, and the mixture is molded. Subsequently, the molded product is carbonized and activated, followed by washing.