Drying & Thermal Processing

Vacuum Dryer

We offer the state-of-the-art mechanically fluidized ploughshare mixer action to agitate and individualize the particles to be dried. The ploughshare mixer is a horizontal cylindrical vessel with heat transfer jacket on the housing and endplates. Simultaneously adding heat, the unit is placed under vacuum to pull off water or solvents while preserving the physical or chemical properties of the material.

Due to the large heat jacketed area and the very efficient mixing action, we avoid putting extra work into shear sensitive materials and offer shorter drying cycles than other drying technologies.

Phase Change Reactor

The ploughshare mixer is the ideal technology for phase change reactions. The mixing, heating and vacuum drying allow the material to pass through all phase of the process in one machine; liquid, paste, granule and powder.

During the liquid stage and the early portion of the paste stage, the product is a thickening slurry which is readily put into turbulence by the mixing plows using the critical Froude number (the point at which the plows force the batch into turbulence and maximize the heat transfer capability of the dryer). Using the critical Froude number enables fast, efficient transfer of the heat energy required to satisfy the latent heat of vaporization, generating a much shorter drying cycle.

As the slurry thickens at the end of the paste stage into a mud-like consistency, which in conventional dryers causes the batch to ball or cake, making drying exceedingly difficult due to the moisture getting trapped away from the particle surface, the ploughshare mixer excels. At this point, with the benefit of the turbulent plows and using high shear choppers to reduce clumps and to form smaller granules, the exposed surface area of the material keeps the external drying mechanism in effect. The materials finishes drying and granules are maintained or powder is formed.

Vibrating Fluid Bed Processor

vibrating fluid bed processor to heat, cool or moisturize bulk solidsThe vibrating fluid bed processor is the perfect way to heat, cool or moisturize you bulk solid material. By passing controlled process air up through the material bed of the vibrating Fluid Bed Processor, the material is percolated like a gently boiling fluid. The solid particles undergo intensive intermixing as the process air surrounds each particle, permitting direct heat and/or moisture transfer between the air and the particles.

It is this intimate contact between air and material particles which makes a fluidized bed the most efficient convection heat and moisture transfer continuous processor. We can provide the entire system or any portion of it. We provide the interface engineering between components for quick installation and trouble free operation.

Impact Dryer Mill

When your process calls for both grinding and drying, the Impactor Dryer Mill will help you produce a premium product at a lower cost per ton. The system simultaneously grinds and dries, accurately classifies and conveys materials in one continuous automated operation, eliminating separate drying and grinding equipment.

The Impact Dryer Mill speeds drying because the material is dried in fluid bed suspension. Impact grinding the product exposes greater surface area to the drying heat, allowing the exposed moisture to flash off and drying the particle faster.

The air sweep action in the mill runs a continuous stream of heated air through the system to sweep product sized particles and fines up and out of the grinding chamber to an integral classifier for particle size control. The over-sized particles remain in the heated grinding chamber until they are reduced in size, dried and then pass through the classifier to the product receiver.

We can provide the complete system including air heater, Impact Dryer Mill, raw material feeder, product receiver, air management system and controls. We can dry materials such as gypsum, filter cake, clays, soft minerals and coal.

Roller Mill Drying

The Roller Mill uses a set of free swing journals (grinding rolls) that swing out centrifugally to grind material against a steel bull ring. As the material is feed into the mill, the material is air sweep which creates a fluid bed grinding chamber and also sweeps finer particles up into an integral classifier to provide an accurate product particle size distribution. The fluid bed allows the journals to freely rotate through the material, grinding the material against the steel bull ring.

By adding heat to the sweeping airflow, we can concurrently grind and dry the material. By varying the journal rotational speed, we control the grinding force and the amount of particle reduction. This is a technology that can be used to grind materials down to the 70-325 mesh range. Typical products include Bauxite, Bentonite, clays, coals, coke, dolomite, graphite, lime, limestone, expanded perlite, sulfur, talc, titanium oxide and tobacco.

 

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