Dry-Phase Ceramic Granulation via Rotary Paddle Agglomeration
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Solution Overview
Problem
The wet-phase grinding and subsequent drying by atomization method in ceramic production is energy-intensive, pollutes the environment, and requires excessive water, leading to high system inertia and increased investment costs, while the dry-phase method is not extensively used due to challenges in handling fine powders and achieving suitable granulation.
Innovation Solution
A method of granulation by agglomeration after dry-phase grinding, using a horizontally arranged rotary cylindrical device with paddle-shaped bars to mix and granulate ceramic compositions with minimal water addition, achieving suitable particle morphology and mechanical strength without binders or additives, and adjusting moisture content through low-temperature drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wet-phase grinding and drying by atomization is used, then fine particle size is achieved, but water consumption and energy consumption increase significantly
Solution Approach 1:
The invention changes the fundamental parameter of the grinding medium from liquid (wet-phase) to gas (dry-phase), eliminating the need for subsequent drying operations. This parameter change resolves the contradiction by achieving fine particle size through dry grinding while completely avoiding the water consumption associated with wet-phase processing and atomization drying.
Solution Approach 2:
The invention avoids the phase transition process entirely by not introducing liquid water into the system. Traditional wet-phase grinding requires evaporation of water during atomization drying, consuming significant energy. The dry-phase method eliminates this liquid-to-vapor phase transition, thereby resolving the contradiction between achieving fine particles and minimizing water/energy consumption.
2Manufacturing precision
If wet-phase grinding and drying by atomization is used, then fine particle size is achieved, but energy consumption increases significantly
Solution Approach 1:
Changing the grinding medium from liquid to gas eliminates the energy-intensive atomization drying process. The dry-phase grinding achieves fine particle size directly without requiring the high energy input needed to evaporate large amounts of water, thereby resolving the contradiction between particle size control and energy consumption.
Solution Approach 2:
By eliminating the liquid-to-vapor phase transition that occurs during atomization drying, the invention removes the primary source of energy consumption in traditional wet-phase processing. This resolves the contradiction by achieving fine particles through dry grinding while avoiding the energy-intensive drying step.
3Manufacturing precision
If wet-phase grinding and drying by atomization is used, then fine particle size is achieved, but environmental pollution increases
Solution Approach 1:
Changing from wet-phase to dry-phase grinding eliminates the generation of polluted wastewater and reduces air pollution from drying operations. This parameter change resolves the contradiction by achieving fine particle size control while eliminating the environmental pollution associated with wet-phase processing and atomization.
Solution Approach 2:
By eliminating the evaporation phase transition of large water volumes, the invention prevents the environmental pollution caused by wastewater discharge and reduces air pollution from drying emissions, thereby resolving the contradiction between particle size control and environmental protection.
4Quantity of substance
If dry-phase grinding is used, then water consumption is reduced, but handling fine powders becomes difficult
Solution Approach 1:
The invention introduces air as an intermediary carrier gas that suspends and transports the dry-ground powder particles. This mediator resolves the contradiction by enabling easy handling of fine powders through pneumatic conveyance while maintaining the water-saving advantages of dry-phase grinding.
Solution Approach 2:
The invention employs pneumatic principles to suspend, transport, and process the dry-ground powder using air flow. This pneumatic handling system resolves the contradiction by making fine powder handling easy and efficient while maintaining the low water consumption characteristic of dry-phase grinding.
5Quantity of substance
If dry-phase grinding is used, then water consumption is reduced, but granulation challenges arise
Solution Approach 1:
The invention performs preliminary classification of the dry-ground powder by particle size before granulation. This preliminary action resolves the contradiction by preparing the powder with appropriate size distribution for effective granulation, making the process as easy as wet-phase methods while maintaining low water consumption.
Solution Approach 2:
The invention uses air as an intermediary to facilitate granulation of dry-ground powder by controlling particle suspension and interaction. This mediator enables effective granulation processes in the dry phase, resolving the contradiction between water reduction and granulation ease.
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 method significantly reduces water and energy consumption, minimizes environmental pollution, and allows for rapid changes in ceramic product production, with a 75-80% reduction in water usage and 80% energy savings compared to traditional atomization methods, while maintaining the plasticity of the ceramic composition.
Implementation Method 1
Agglomeration is a general term defining the increase in grain size due to mechanical forces, i.e., it covers the methods of agglomerating and binding highly dispersed particles into larger aggregates
Implementation Method 2
Agglomeration is a general term defining the increase in grain size due to mechanical forces
Implementation Method 3
adjusting moisture content through low-temperature drying
Data Source
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AI summary
The invention relates to the granulation by agglomeration of ceramic compositions ground in dry phase. The invention proposes an alternative to the method of wet-phase grinding and drying by atomization. The method consists of dry-phase grinding and preparing argillaceous ceramic compositions without binders, additives, or deflocculants from argillaceous minerals (about 60%) mixed with inorganic materials, grain sizes of less than 120 micrometers, in a horizontal rotary cylindrical device with deflecting paddles, the intake of said minerals, powdery materials and water takes place at one end of said device; and granules that are moved by said deflecting paddles are formed due to the rotation of said device. The outlet of the granulated material is at the opposite end of said device. The invention offers the following advantages: energy savings of 80%; savings in water consumption during granulation of 75-80% and 10-20% of additional savings in the pressure for pressing the granules. The time necessary to change from one ceramic composition to another is one hour, compared with several days using the current method of atomization. The method of granulation constitutes a novel environmental technology with zero air and water table pollution, and with much lower water consumption.