Electrostatic Separation of Activated Particles After Mechanochemical Milling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing mechanochemical activation processes face challenges in efficiently separating activated and non-activated particles, leading to inefficiencies and potential recycling issues, as conventional methods fail to distinguish between activated and non-activated particles based on their charge behavior.
Innovation Solution
The method involves mechanochemical activation in a mill followed by electrostatic classification to separate activated particles from non-activated particles, utilizing their differing charge behaviors to achieve efficient separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional separation methods are used to separate activated and non-activated particles, then the separation process is simple, but the separation efficiency is low and purity is poor
Solution Approach 1:
The patent changes the separation parameter from physical properties (size, density) to electrical charge properties. By utilizing the different charge states between activated and non-activated particles, the electrostatic classifier achieves high separation purity. This parameter transformation resolves the contradiction by enabling precise separation without increasing device complexity significantly.
Solution Approach 2:
The patent replaces conventional mechanical separation methods with an electrostatic classification system. Instead of using mechanical means to separate particles based on physical properties, the system uses electrical fields to separate particles based on their charge behavior, thereby achieving superior separation purity while maintaining reasonable system complexity.
2Reliability
If thermal activation is used to activate clays, then the activation process is well-established, but energy consumption is high and harmful emissions are generated
Solution Approach 1:
The patent replaces thermal activation with mechanochemical activation using an agitated ball mill. Instead of using heat to activate clay minerals, the system uses mechanical energy from ball milling to achieve activation. This substitution dramatically reduces energy consumption and eliminates harmful thermal emissions while maintaining reliable activation of the clay minerals for use as cement additives.
3Loss of energy
If mechanochemical activation is used to activate clays, then energy consumption is reduced and material properties are improved, but separation of activated and non-activated particles is difficult
Solution Approach 1:
The patent addresses the separation difficulty by changing the separation parameter from physical properties to electrical charge properties. The electrostatic classifier detects and separates particles based on their charge state, which differs between activated and non-activated particles. This parameter transformation enables accurate separation despite the challenges posed by mechanochemical activation, resolving the contradiction between energy efficiency and separation accuracy.
4Object-generated harmful factors
If clinker content is reduced to decrease carbon dioxide emissions, then environmental impact is reduced, but cement strength may be compromised
Solution Approach 1:
The patent transforms the properties of clay minerals through mechanochemical activation, changing them from inert fillers to active cementitious materials. The activated clay minerals exhibit pozzolanic reactivity and can replace clinker while maintaining or even improving cement strength. This parameter transformation of the raw material enables reduced clinker content and lower CO2 emissions without compromising strength.
Solution Approach 2:
The patent recovers and reactivates clay minerals that would otherwise be inert fillers. By applying mechanochemical activation, the clay minerals regain their reactivity and contribute to strength development. This recovery process enables the substitution of clinker with activated clay, reducing CO2 emissions while maintaining cement performance.
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
This approach enhances the purity of the activated fraction, increasing its usability as a cement additive and reducing the need for clinker, thereby decreasing carbon dioxide emissions in cement production.
Implementation Method 1
transfer of the activated material to an electrostatic classifier, separation of the material in the electrostatic classifier into a charged fraction and a discharged fraction
Data Source
Figure 1~3
AI summary
The invention relates to a device for mechanochemical activation. The device has a mill (10), said mill (10) having a material inlet (12) and a material outlet (14). The device has a first separating device (20) arranged downstream of the mill (10) in the material flow, and the device has a product outlet (30) arranged downstream of the first separating device (20) in the material flow. The invention is characterized in that the first separating device (20) is an electrostatic separator, wherein the electrostatic separator has a first outlet (22) for charged particles and a second outlet (24) for discharged particles. The first outlet (22) is connected to the product outlet (30), and the second outlet (24) is connected to a return line (40), said return line (40) being connected to the material inlet (12) of the mill (10).