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Through the up and down movement of the anode, the electrolyte can be stirred to accelerate the dissolution and diffusion of alumina, so as to extinguish the anode effect(abrasive blast media wholesale price pakistan). Therefore, the electrolyte at the bottom of the anode needs to be stirred next, causing the anode gas to accumulate in the bottom palm of the anode, triggering the anode effect(aluminium oxide blasting media). 

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When these two ions are co-discharged on the anode, the anode process Becomes hysteresis, the anode changes from the activated state to the passivated state(120 grit aluminum oxide sandblasting media), and the anode gas begins to accumulate in the bottom palm of the anode, which separates the electrolyte from the anode, thus triggering the anode effect electrostatic attraction theory(abrasive blast media wholesale price pakistan).

Theory of Ammonia Ion Discharge(aluminium oxide blasting grit). The theory believes that the occurrence of the anode effect is due to the change in the anode process, that is, the change from oxygen ion discharge to fluoride ion discharge(steel shot abrasive). When the anode effect occurs, the anode gas contains a small amount of carbon chloride of 0.4% to 2%, and then the volume fraction of carbon fluoride gradually rises to 15% to 30%(abrasive blast media wholesale price pakistan). 

In addition(aluminum oxide anti slip grit), the theory is based on the detection of anode gas when the anode effect is about to occur or is occurring, and it is found that in addition to CO2 and CO, it also contains CF gas, and with the development of the anode effect, the carbon chloride The volume fraction is getting higher and higher(abrasive blast media wholesale price pakistan). In order to stir the electrolyte, the method of repeatedly lifting the anode up and down can also be adopted. 

But when the alumina content is very low(garnet blasting media), such as 1.5% or less, the relative proportion of fluoride anions in the electrolyte increases, which creates conditions for the co-discharge of fluoride and oxygen ions(abrasive blast media wholesale price pakistan). The negative impact of the anode effect is mainly manifested in: when the anode effect occurs, aluminum oxide is added to the electrolyte, and the wettability of the electrolyte to the anode becomes better again(alumina blasting). 

When the alumina content in the electrolyte is high, the theory believes that the anodic effect is a combination of two reasons(220 grit aluminum oxide blast media): on the one hand, the decrease in the alumina content in the electrolyte causes the deterioration of the wettability of the electrolyte to the anode; the decrease in the alumina content The fluoride ion discharge changes the anode gas composition, or changes the surface properties of the carbon anode(abrasive blast media wholesale price pakistan).

Anode gas is mainly CO2, which chooses to adsorb cations in the electrolyte and is positively charged, and there is a repulsive force between it and the anode, so the bubbles can discharge CO2 from the anode and adsorb Al2O3, which is positively charged(aluminum oxide blasting abrasive). The anode gas is not easy to be discharged, forming a gas film and triggering the comprehensive theory of anode effect(abrasive blast media wholesale price pakistan). 

Scholars such as Zhang Mingjie and Qiu Zhuxian believe that when the mass fraction in the electrolyte is less than 2%(alumina grit), it is the anode effect caused by F-ion discharge, and when the mass fraction is greater than 2%, the anode effect occurs because of the blockage of anode gas(abrasive blast media wholesale price pakistan). The theory believes that the occurrence of the anode effect is due to the electrostatic attraction between the anode and the anode gas(silicon carbide grit). 

To sum up, the common characteristics of the anode effect are(abrasive blast media wholesale price pakistan): the content of aluminum oxide in the electrolyte is reduced; the composition of the anode gas changes, and there is carbon fluoride; the anode gas accumulates in the bottom palm of the anode, etc(aluminum oxide sandblasting abrasive). As a result, the gas film on the bottom palm of the anode is destroyed, the effect is extinguished, and normal electrolysis is restored. process. 

The aluminum oxide content limit when the anode effect occurs is related to conditions such as the electrolysis temperature and the physical and chemical properties of the electrolyte(aluminium oxide shot blasting grit). However, if only alumina is added without other measures, the anodic effect can not be extinguished quickly. When the electrolysis temperature is too low, the effect can occur when the mass fraction of Al203 is about 2%(abrasive blast media wholesale price pakistan). 

Similarly(silicon carbide powder), during electrolysis under normal state and appropriate low temperature, the occurrence of anode effect tends to lower alumina mass fraction, for example, the mass fraction is 0.5% ~ 1.0%(abrasive blast media wholesale price pakistan). Under high effect voltage, chewing sound is often heard, the upper structure of the electrolytic cell vibrates slightly, and local fragmentation of the anode bottom can be found occasionally(aluminum oxide blasting grit). 

How can the anode effect be extinguished(1200 grit aluminum oxide)? As mentioned in question 29, since the anode effect occurs due to the low alumina content and the accumulation of gas film at the bottom of the anode, on the other hand, in order to extinguish the anode effect in the industrial electrolytic cell, alumina is usually added to the electrolytic cell first to restore the alumina content during normal electrolysis(abrasive blast media wholesale price pakistan). 

Because the alumina added in the normal way has a dissolution process(glass bead abrasive), especially it takes time to restore the alumina content of the electrolyte in the anode area to normal(abrasive blast media wholesale price pakistan). Aluminum chloride rhombic hexahedron structure, lattice constant is a. = 0.5016nm, a = 58932, it is A-type multiparticle at low temperature, phase transition occurs at 453 ℃ and transforms into β The phase transition heat is 0.63j/mol(240 grit aluminum oxide).

The anode gas contains CF, which selectively adsorbs the anions in the electrolyte, is negatively charged, and attracts each other with the anode(aluminum oxide abrasive media). According to the theory, when the alumina content in the electrolyte is high, the relative proportion of oxygen ions is large, which is mainly due to the discharge of oxygen ions on the anode(abrasive blast media wholesale price pakistan). When the anode effect occurs, the noise frequency of the cell voltage increases(alumina abrasive powder). 

The common method is to insert a wooden rod into the lower part of the anode where the anode effect occurs, and use a large amount of hydrocarbon gas released by the wooden rod at high temperature to stir the electrolyte to promote the dissolution and diffusion of alumina and homogenize the concentration(150 grit aluminum oxide); Second, disperse the bubbles adhered to the bottom palm of the anode to extinguish the anode effect(abrasive blast media wholesale price pakistan).

This method is simple and easy to master, but it increases labor intensity and environmental pollution(abrasive blast media wholesale price pakistan). In the industrial aluminum reduction cell, the cathode carbon block at the bottom of the cell is not the real cathode, but the aluminum liquid covered on the cathode carbon block(corundum sand). For advanced aluminum reduction cells, the effect coefficient is controlled to 0.0l or even lower, and some realize no effect operation.