Abstract
A generation of hydrogen and oxygen bubbles by of aqueous solutions of electrolytes was carried out. Two electrolysis modifications was study: electrolysis without a membrane to production of oxygen and hydrogen and membrane electrolysis with separation of catholyte and anolyte. The influence of the model conditions of the experiment such as electrolyte pH, concentration, and current density and the distribution of bubble sizes and gas holdup in the column are discussed. An inverse dependence of the hydrogen bubbles diameter in the catholyte medium on the current density and a direct dependence on the concentration of electrolytes are experimentally investigated. The oxygen bubbles tend to become larger with increasing current density and electrolyte concentration in anolyte medium. In electrolysis without a membrane, bubbles become smaller with increasing current density and decreasing the electrolyte concentration.
Highlights
Flotation processes are very effective for separating fine particles in mineral processing
According to [13], the mobility of the OH- anion is almost 5 times higher than the HCO3- anion. It can explain why gas hold ups in non-membrane electrolysis does not depend on the NaOH concentration
From the experimental studies the following conclusions can be drawn: 1. The gas hold ups tend to increase with current density and decrease with the increase of electrolyte concentration
Summary
Flotation processes are very effective for separating fine particles in mineral processing. The efficiency of flotation processes depends on effective collision between micro-bubbles and particles, which is influenced by their size and potential [1, 2]. Diameter and distribution of the bubbles generated by water electrolysis are important in the electroflotation process of fine particles. It is well known that these parameters influence the efficiency of the flotation process because they affect the collision, adhesion, and transport mechanisms. The smaller the bubble diameter, the better the recovery of fines due to the larger surface area of the bubble. The study are shows that efficiency is highest when bubbles and particles have opposite surface charges and are of similar sizes
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