Flexomix continuous agglomeration system

Hosokawa Micron provides the solids and bulk handling industry with innovative process systems for the agglomeration of fine powders and particles, also called wet granulation or particle size enlargement. Agglomeration solutions are great tools for improving physical properties like flowability, wettability and dispersability, bulk density and product appearance.

The Flexomix continuous agglomeration system is a combination of two proven Hosokawa technologies: the Flexomix continuous mixer/agglomerator and the Schugi fluid bed dryer and cooler. This combined design provides optimal process control and makes it the ultimate powder processing solution.

The Flexomix agglomeration system is controlled using a state-of-the-art integrated control system based on PLC and SCADA systems. It produces instant agglomerates with an open, raspberry-like structure, good solubility and good flow characteristics. The fluid bed dryer is specially designed for this system as a stationary unit without any moving parts, making it perfect for scaling up to almost any size.

The Flexomix continuous agglomeration system is a powerful combination of a number of functionalities:

Powder handling system
Powder dosing system
Binder dosing system(s): water, steam, and other liquids
Schugi^® Flexomix mixer and agglomerator (FX),
Schugi^® Fluid Bed Dryer and Cooler (FBD)
Air system including blower and heating/cooling equipment
Air exhaust system including cyclone and filter
Product classification and size crusher (if necessary)
State-of-the-art integrated control system

This combination means that base powders can be fed as a mixture or as multiple powders in parallel. An accurate, gravimetrical powder feeding subsystem ensures a constant powder/liquid ratio and a liquid dosing skid ensures accurate flow control and a constant powder/liquid ratio in the agglomerator. This liquid skid can be equipped with a stirrer or a heated tank for example, or in the case of solution binders, a preparation tank.

Flexomix mixer/agglomerator

Powders and liquids can be fed into the unit through top inlet(s) using air atomizers which combine with turbulent air flow inside the mixer’s vertical chamber, mixes powdery and liquid particles intensively and instantaneously.

The Flexomix has been designed to be compact whilst allowing for homogeneous mixing of powders and liquids at capacities of up to 40,000 kg/h. To achieve this, the Flexomix has a flexible mixing chamber and a shaft with pitch-adjustable mixing blades that rotate at high speed. The resulting granulates have a porous, raspberry like structure in particle sizes of 0.1 to 1.2 mm and with a D50 between 300 and 700 micron at low to medium density.

Schugi fluid bed dryer

The wet granulates from the Flexomix are then processed in a Schugi^® fluid bed dryer which is divided into several compartments. The front end compartments are used for drying; the rear for cooling. Product height in the bed can be altered from between 100 and about 500 mm (average 300 mm), and depending on the application, variable residence times can be achieved by adjusting the bed height.

The Flexomix agglomeration system has an air system and air exhaust system including cyclone and filter, as well as a one or two-deck sieve and an oversize crusher for product classification.

Continuous process
Compact design in capacities between 50 kg/h and 40,000 kg/h
Separate operating units for agglomeration and drying/cooling for optimal process control
Multiple simultaneous liquid addition possible
Vertical mixer/agglomerator with self-cleaning mixing chamber
Integrated system approach

Schugi fluid bed dryers/coolers are available in sizes (air distribution plate area) ranging from 0.25 m² to > 20 m². The required size of the dryer/cooler is generally determined in our test centre and depends on product throughput, evaporation capacity, particle size distribution, air temperatures and final product temperature.

The Flexomix mixer/agglomerator is available in six sizes. Their typical characteristics are described below. Please note that these values are indicative only. Detailed information is available on request.

Model	[-]	FXD- 100	FXD- 160	FXD- 220	FXD- 250	FXD- 335	FXD- 400
Length	[mm]	520	702	976	976	1270	1270
Width	[mm]	650	620	880	880	1100	1100
Height incl. motor	[mm]	1265	1500	1967	1967	2270	2910
Capacity (bulk density 0.5 kg/l)	[kg/h]	100 - 400	250 - 1000	800 - 2500	2000 - 4000	3000 - 10,000	8000 - 40,000
Typical motor power	[kW]	3	7.5	7.5 - 10	11 - 15	22 - 45	37 - 75

PREPARATION & DOSING

Liquid premixes can be prepared in the make-up tank and, if multiple powders need to be premixed, a live hopper or Nauta^® mixer can be integrated. To guarantee a constant and accurate flow of powder and liquid, high-quality powder dosing feeders and liquid dosing systems are an integral part of the system.

DRYING & COOLING

In the static fluid bed dryer, the agglomerates are dried and cooled. After cooling, the product is conveyed to the product classifying section for preparation of the final product.

CLASSIFICATION & PACKAGING

After classification, the product is split into on-size, over-size and (if needed) fines material. Over-size material can be crushed and fines can be reprocessed if applicable. On-size agglomerates can be stored in big bags or transported to a final packaging line. This whole process takes place in continuous mode.

AIR TREATMENT

The performance and functionality of the fluid bed in combination with the air treatment section is an important part of the agglomeration process as this can have a direct impact on the level of agglomeration and product quality.

CONTROLS & PROCESS AUTOMATION

Hosokawa Micron's systems include optimally integrated hardware and software controls to ensure consistently high product quality under varying circumstances. We can provide ergonomic and visual HMI-PLC panels including lot traceability, operator identification, remote service, alerts and customized data reports to give you full insight into your production processes.

When designing an agglomeration system, it is important that agglomeration is not treated as a stand-alone process. That's why our experts work closely with your team to design an integral production concept that meets your broader needs – both today and in the future. Our approach is based around the clear definition and careful consideration of each individual process step, including storage, conveying, charging, mixing, agglomeration, drying, cooling, discharging, sieving, packing and more. This results in a tailor-made agglomeration system solution that is optimally engineered for you.

Powder agglomeration system