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The moisture contained in the alumina and fluoride salt added to the tank and various impurities, such as SiO2, Na20, P20, etc.(brown fused alumina wholesale suppliers uae), will chemically react with the electrolyte, which will increase the molar ratio of the electrolyte. In order to keep the electrolyte composition stable, it is necessary to frequently determine the molar ratio of the electrolyte. 

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Reducing the primary crystallization temperature can reduce the working temperature of the electrolytic cell, improve the current efficiency and reduce the heat loss(brown fused alumina wholesale suppliers uae); Reduce the thermal damage and deformation of equipment and prolong the service life of electrolytic cell(120 grit aluminum oxide sandblasting media); Reduce electrolyte volatilization loss and improve working environment. 

Accurately add excess NaF to the acidic electrolyte sample to be tested and sinter it to make it an alkaline electrolyte. Industrial aluminum electrolyte is a mixed system, and its primary crystallization temperature belongs to the latter case(brown fused alumina wholesale suppliers uae). Neutral to alkaline electrolytes, wet with water at low temperature, and show pink to reddish when titrated with phenolphthalein indicator(150 grit aluminum oxide). Conductivity method. 

Therefore, once the neutralization point is reached, the molar ratio of the original tested sample is calculated based on the total amount of NaF added(pink aluminum oxide). The thermal titration method has higher accuracy, but due to the complicated procedures, it is only used to verify other analytical methods(brown fused alumina wholesale suppliers uae). After that, the phenol brewing solution is used to determine whether it has reached the neutralization point(aluminium oxide blasting media). 

The excessive NaF contained in the alkaline electrolyte sample is soluble in water, while the NaF bound in cryolite is not(brown fused alumina wholesale suppliers uae). The temperature at which a solid substance begins to melt is called the melting point of the substance. At present, the actual controlled molar ratio of the electrolyte used in the large-scale pre-cultivation tank is between 2.1 and 2.6(sponge media abrasive). Lewis acid can reduce the electrolyte molar ratio. 

The neutral fracture is dense, the acid fracture is porous, and the alkaline fracture is dense and hard(aluminium oxide blasting grit). Prepare a series of samples with different excesses of NaF, measure the conductivity of the solution with an AC bridge, and obtain the relationship curve of the solution conductivity to the molar ratio of the electrolyte(brown fused alumina wholesale suppliers uae). There are several common methods for determining the molar ratio(glass bead abrasive): thermometric titration. 

Determine the conductivity value of the aqueous solution of the sample to be tested and compare it with the standard curve to obtain the molar ratio of the sample to be tested(black corundum). However, for mixture systems or solid solutions, their crystallization or melting process is completed within a certain temperature range, so their primary crystallization temperature is not equal to the melting point, as shown in the figure(brown fused alumina wholesale suppliers uae).

Therefore, according to the amount of NaF added, the molar ratio of the sample to be tested is estimated(brown fused alumina wholesale suppliers uae). X-ray diffraction analysis method. What is the primary crystallization temperature of electrolyte and what is its significance to the process of aluminum electrolysis(alumina blasting)? Primary crystal temperature refers to the temperature when the liquid cools slowly and begins to form solid crystals. 

For acidic electrolyte(aluminum oxide sandblasting media), it is only necessary to add excess NaF to the sample and sinter it together to make it an alkaline electrolyte, and determine its molar ratio(brown fused alumina wholesale suppliers uae). For single pure crystalline substances, the temperature of their crystallization or melting process is constant, so their primary crystallization temperature and melting point have the same value, as shown in the figure(220 grit aluminum oxide blast media). Observation.

The acid-base degree of liquid electrolyte can be qualitatively judged from the color and fluidity of liquid electrolyte, the floating state of carbon slag, the color and shape of flame emitted from the tank, and the adhesion of electrolyte to iron needle(brown fused alumina wholesale suppliers uae). Primary crystal temperature is an important property of electrolyte, which is the basis for determining the working temperature of electrolytic cell(silicon carbide grit).

It also affects the primary crystallization temperature of the electrolyte(white aluminum oxide). Then the physical meaning of primary crystallization temperature and melting point is different. In order to make the electrolyte have enough fluidity, the working temperature of the electrolytic cell is generally controlled in the range of 10-20 ℃ higher than the primary crystallization temperature of the electrolyte(steel shot abrasive). 

In the past 30 years, the commonly used electrolyte analysis method in major aluminum plants is X-ray diffraction(aluminum oxide blasting abrasive). The precise X-ray radiometer specially developed for aluminum electrolyte analysis can measure the intensity of certain diffraction peaks and their background, as well as the intensity of Ca-fluorescence radiation, and give the composition data of the tested sample within 1 to 3 minutes(brown fused alumina wholesale suppliers uae). 

The scope of application of X-ray cross beam analysis method is shown in the table. Ion selective electrode method(alumina grit). Except for NaF, the other components are basically insoluble in water, so the NaF in the electrolyte can be immersed in the aqueous solution(silicon carbide powder). The fluoride ion selective electrode analyzes the amount of NaF remaining in it(brown fused alumina wholesale suppliers uae). Aluminum is made by electrolysis, and alumina is the best raw material.

When the mass fraction of alumina in the system reaches 11%, the primary crystallization temperature of normal cryolite reaches the lowest point of 962.5 ℃(aluminium oxide shot blasting grit). It can be seen that the primary crystallization temperature of n-cryolite melt is 1010 ℃, but after adding alumina and dissolving it to form a uniform melt, the primary crystallization temperature decreases with the increase of alumina content(brown fused alumina wholesale suppliers uae). 

The mass fraction of alumina has a great influence on the primary crystallization temperature of cryolite melt(brown fused alumina wholesale suppliers uae). According to the amount of NaF added, the excess amount of AF in the original sample can be calculated to obtain the pH value of the sample(aluminum oxide anti slip grit). The average mass fraction of alumina increases by 1%, and the primary crystallization temperature of cryolite melt decreases by about 4.3 ℃. 

The principle is to gradually add solid NaF to the molten acidic electrolyte to be tested to neutralize the NaF with the excess AIF in the melt and combine to form NaAlF(brown fused alumina wholesale suppliers uae). Each time a small amount of NaF is added, a small amount of electrolyte sample is taken out and condensed(aluminum oxide blasting grit). It is a simple binary eutectic system, the eutectic point is at the mass fraction of 11% alumina, and the eutectic temperature is 962.5 ℃.

Due to the improvement of automatic control level, the working temperature of modern aluminum reduction cell may be stabilized in a narrower range(garnet blasting media), such as 8~12 ℃ higher than the primary crystal temperature of electrolyte(brown fused alumina wholesale suppliers uae). On the premise of ensuring that other physical and chemical properties of the electrolyte meet the electrolysis requirements, the lower the primary crystallization temperature, the better(240 grit aluminum oxide).