*3.4. Results of the Pressure Drop Calculation*

The results of the pressure drop calculations for the example hydromixtures of mass concentrations of 21.30%, 42.75% and 50.00%, without the addition of deflocculant (pure) and with deflocculant (DFL), are presented in Figure 4.

**Figure 4.** The results of frictional pressure drop calculations for hydromixtures of selected solid phase concentrations: (**a**) 42.75%, and (**b**) 50.00%.

The pressure drop values presented in the graphs above Figure 4 show an increasing trend of increasing volumetric flow rate and mass concentration of the hydromixture. However, the growth is smaller for the hydromixtures with the addition of deflocculant due to the viscosity decrease. This effect allows for the transportation of a constant amount of solid phase mass in hydromixtures of higher mass concentrations and a smaller pressure drop.
