Twin Shaft Batch Mixers
From SolidsWiki - Encyclopedia About Equipment for Handling & Processing Bulk Solids
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The twin-shaft batch mixer has become a preferred technology for concrete production in many countries. This mixer is used to replace manual mixing with a shovel in which a line of aggregate, cement, and water positioned on the ground, was repeatedly shoveled from right to left. This concept was later abandoned and over a number of development stages, was replaced by today’s highly dynamic movement process.
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Operation Principles
- Generation of a circular three-dimensional movement of the whole mixture
- Intensive material exchange in the turbulent overlap area of the two mixing circles
- Optimal utilization of the energy input into intensive relative movements of the mixture
- Inclusion of the whole material volume in the mixing process at any time of the process
Advantages
Consistent high level of homogeneous mixture within rapid mix cycles
- Homogeneous mixture levels of 95% are achievable within 30 seconds
- Batch after batch the mixers produce high level uniform and homogeneous mixtures
- The mixing techniques preserve the grain structure of the individual recipe components
High energy efficiency
- High mixture performance is achieved at low speeds
- Reduced energy consumption due to short mixing cycles, effectiveness of mixing tools and efficiency of drive units
Low-wear
- Minimal wear of mixing tools and trough liners achieved from relatively low mixing speed and mixer compact design
- Reduced wear compared to pan or planetary mixers
- All wear parts have been optimized and designed for longevity
Efficient concrete production
- Fast and optimal use of cement and other binders
- Potential for saving of cement and other binders
- Consistent and fast distribution of additives and admixtures throughout the whole mixture volume
- Batch to batch consistency for every mixing cycle
- Minimum batch filling levels of 10% are possible
- Guranteed future-proof in view of new concrete recipes (SCC, UHPC, etc.)
- Hybrid mixing cycles possible (slow – fast – slow)
