Wet agglomerates

For comparison, two curves were calculated for a/x=0,, one representing the exact theory of Rumpf and Schubert and the other an earlier approximation by Pietsch and Rumpf. 

For the determination of the maximally transferable uniaxial tensile stress equation (13) can be rewritten  

In the capillary state the strength of agglomerates is determined by the capillary suction. Since only those pores filled with the liquid contribute to the strength, equation (3) must be rewritten  

In the transition range, the funicular state (i/ Lb / L / Lc) which liquid bridges coexist with liquid-filled pores, two cases can be constructed which follow a model published first by Rumpf  

Assuming that the ratio of the liquid in the bridges to the total liquid diminishes linearly from 1 at t/ Lb lo lc one obtains the following relationship for 

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These relationships predict the binding Hquid content for wet agglomeration with an accuracy of only ca 30%. The Hquid content required to agglomerate a particular feed material depends, for example, on the interfacial properties of the system (45). Typical values of moisture content required for hailing a variety of materials are listed in Table 2. Very accurate information on the optimum Hquid content to agglomerate a particular feed material must be obtained from experimental tests. 

Mechanistic Understanding of the Wet Agglomeration Process and the Power Consumption Profile... 

Some Hints Concerning the Wet Agglomeration Process in a High-Shear Mixer to Avoid Problems... 

Very often the bonding of wet agglomerates uses a combination of mechanisms III.l and III.2. In that case partial volumes exist which are completely filled with liquid while in others liquid bridges prevail. 

An important parameter of wet agglomerates is their liquid saturation l> the relative amount of voids filled with liquid ... 

Assuming that the density Pw of the liquid (in most cases water) is known and the mass of the wet agglomerates M>v+s had been determined prior to drying, the liquid saturation can be calculated from M>v=Mw+s s ... 

Figure 59. Different models of liquid distribution in wet agglomerates, (a) Liquid bridges or pendular state, (b) transition region, partially saturated pores, or funicular state, (c) capillary state, saturated pores, (d) liquid droplet filled with particles...

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