Effect of hydrodynamic parameters on nickel removal rate from wastewater by ion flotation

This work is an extension of previous studies [S. Masiuk, Power consumption measurement in a liquid vessel that is mixed using vibratory agitator, Chem. Eng. J. 75 (1999) 161–165; S. Masiuk, Mixing time for a reciprocating perforated plate agitator, Inz. Chem. Proc. 20 (1999) 601–612; S. Masiuk, Dissolution of solid body in a tubular reactor with reciprocating plate agitator, Chem. Eng. J. 83 (2001) 139–144; S. Masiuk, Heat transfer measurement in a liquid vessel that is mixed using vibratory agitator, Chem. Eng. J. 61 (1996) 107–112] carried out on the reciprocating agitator, in which additional information describing the experimental apparatus and measurements procedure may be found, as well as, dimensionless correlations predicted for agitator with a single plate. The experimental investigation are provided for the explanation of the influence on the power consumption, mixing time, mass and heat transfer of the multiplates low-frequency and high amplitude reciprocating agitators. The maximum power consumption is calculated by multiplying the maximum force acting on the shaft and maximum velocity of the agitator. A thermal-response technique is used for mixing time measurements. The mass transfer coefficient is calculated from a mass balance between a dissolution solid body and its surrounding mixing dilute solution. The heat transfer coefficient from the heating jacket wall to the continuous flow of the mixed liquids is measured by the stabilized heat flow method. The analytical dimensionless equations predicted in the present paper generalize the experimental data without the break through the all regions of flow in a relatively simple and uniform manner.

Power consumption, mixing time, heat and mass transfer measurements for liquid vessels that are mixed using reciprocating multiplates agitators

The effect of energy input on the flotation of quartz in an oscillating grid flotation cell

The effect of energy input on flotation kinetics

Experimental data are provided for the breakage of chalk aggregates in liquid suspensions agitated by rotating and vibrating mixers. The results are analysed using a mechanistic model of breakage which relates the pseudoequilibrium aggregate size to the energy dissipation rate in the stirred vessel. The analysis suggests that the growth and breakage of the chalk aggregates are reversible processes which lead to the formation of fractal aggregates with a dimensionality close to 2. Additionally, the breakage of aggregates in both the vibrating and the rotating mixers occurs by turbulent fluid stresses and is uniquely related to the energy dissipation rate in the vessel and the fractal dimensionality of the aggregates.

Ikuo Minami

Papers

Power dissipation in a vibrating disc column