(IV) Analysis of special flotation dynamics Some scholars have conducted some research on the ion flotation kinetics, but it is still to be further studied. Only one of them is introduced here. Where C—the concentration of the target component; Where ε - the recovery of the target component. K 2 and k 3 vary from 0 to 1; In the case of hydrophobic precipitate flotation (adhesion flotation), For the equations (15) and (16), the measure of ( k 1 ) m is "cm" and the measure of C is "mol/liter". (1) According to the kinetic conditions, the adhesion flotation mechanism is more ideal than the adsorption flotation mechanism. Aluminum plate refers to the aluminum material with a thickness of more than 0.2mm to less than 500mm, a width of more than 200 mm, and a length of less than 16m, which is called aluminum plate or Aluminum Sheet. Aluminum plate with a thickness of less than 0.2mm is called aluminum material, and aluminum plate with a width of less than 200 mm is called row material or strip material (of course, with the progress of large equipment, there are more aluminum plates with a maximum width of 600 mm). Aluminum plate, aluminum rolling plate, Extrusion Aluminum plate for heat exchanger Trumony Aluminum Limited , https://www.szaluminumsheets.com
According to the research, the speed of ion flotation has nothing to do with its mechanism, and can be expressed by the following formula: 
t———flotation time;
Q———the amount of bubbles;
V—the volume of liquid in the flotation cell;
K———The dimensionless kinetic coefficient.
In general, k is a complex function of c, and the average value k - of the kinetic coefficients in the time range from 0 to t is obtained by:
Under the condition of special flotation, the recovery rate ε is industrially significant within the range of 90 to 99%. Under this condition, the flotation time required to achieve a given recovery rate can be calculated according to equation (13). Or calculate the k value under various process conditions, and analyze the kinetic conditions of the process with the best value of k as the target.
The kinetic coefficient k is the equilibrium state of the target component on the bubble 10,000 k 1 (adsorption or adhesion), the kinetic factor k 2 liquid and the foam layer height k 3 (the completeness of the separation), the specific surface area of ​​the bubble k The product of the kinetic coefficients of 4, etc. K=K 1 •K 2 •K 3 •K 4 (14) As the average diameter of the bubble); as for the k 1 , in view of the complexity of the problem, it is not currently possible to write a formula for the adsorption or precipitation of the ionic surfactant on the surface of the floating bubble on the surface of the floating bubble, but it can be calculated It corresponds to the limit single layer value (k 1 ) m of the particles adsorbed or adhered to the surface of the bubble. For adsorption during ion flotation: [next]
Under the conditions of industrial mechanical agitated flotation machine and aerated mechanical agitated flotation machine, the kinetic coefficients of different mechanisms of K 2 = K 3 =1, d - =1 mm and k 4 = 60 cm -1 are respectively :
Adhesion mechanism (k 1 ) m =6(10-5~1)/C (17)
Adsorption mechanism k m =6(10 -6 ～10 -5 )/C (18)
The range of (K1) M values ​​for the corresponding two flotation processes is shown in Figure (5). Analysis of these data leads to two conclusions: [next]
(2) Adsorption mechanism The practical k value can be guaranteed only under the condition of concentration less than 3×(10 -4 ～10 -5 ) mol/L.
The range 3 in the above figure (5) is the k value calculated according to the experimental results of the flotation speed and other flotation indexes according to the equation (12). This shows that:
(1) When the original concentration of the target component is in the range of 10 -5 to 10 -2 mol/liter, that is, in the effective concentration range of ion flotation, the adhesion mechanism is better than the adsorption mechanism according to the kinetic conditions.
(2) Kinetics of adhesion mechanism when the original concentration of the target component is 10 -5 to 10 -2 mol / liter under the aeration condition of a conventional mechanical agitation flotation machine and a pneumatic mechanical agitation flotation machine The coefficient average k is in the range of 1 to 20. This corresponds to a flotation time of only a few minutes when the recovery is 90 to 99%.
From the kinetic analysis, the adhesion mechanism of special flotation has greater industrial significance.
Aluminum plate refers to the rectangular plate rolled by aluminum ingot, which is divided into pure aluminum plate, alloy aluminum plate, thin aluminum plate, medium thick aluminum plate and patterned aluminum plate.
November 12, 2021