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240 Grit Aluminum Oxide

When the compound is heated to 734 ℃, it will undergo thermal decomposition to produce normal cryolite and corresponding solution(240 grit aluminum oxide). Industrial electrolyzers use acidic electrolytes with a molar ratio in the range of 2 to 3. If carefully considered, their impact should be calculated(aluminium oxide blasting). The aspect has been developed rapidly, ushering in a new era of modern large-scale pre-compensation slots.


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The ratio of the amount of Naf and AIF contained in the commonly used molten salt system in China is usually called the molar ratio (usually called the molecular ratio in industry), and it is often recorded as CR(240 grit aluminum oxide). That is: a neutral electrolyte with a molar ratio equal to 3, an alkaline electrolyte with a molar ratio greater than 3, and an acidic electrolyte with a molar ratio less than 3(aluminium oxide blast media). 


The capacity of the self culture tank is less than 100kA(120 grit aluminum oxide). In this book, the pre culture tank with a capacity of more than 100kA developed after the self culture tank is called a large pre culture tank, which is different from the small pre culture tank before the self melting tank and the pre melting tank with a capacity of less than 100kA modified on the basis of the self melting tank(240 grit aluminum oxide). Its differential melting point is 734 ℃(corundum sand).


When the corresponding high-temperature melt is cooled to 734 ℃, the peritectic reaction between the precipitated normal cryolite and the solution will form subcryolite(240 grit aluminum oxide). In the state diagram of NaF AIF binary system, the side with molar ratio greater than 3 is the simple binary eutectic system of NaF and naaif, and its minimum eutectic temperature is 888 ℃(black silicon carbide). There are several ways to express the pH of an electrolyte.


Its density is about 2.1/cm, which is about 10% less than the density of molten aluminum (about 2.3g/em) at the same temperature, which can ensure the layering of electrolyte and molten aluminum(240 grit aluminum oxide). If you simplify the problem a bit, do not consider the other components in the electrolyte, the so-called pH of the electrolyte is the ratio of the relative amounts of NaF and AIF contained in it(glass bead blasting media suppliers).


This molten salt system basically does not absorb water, the vapor pressure at the electrolysis temperature is not high, and has greater stability(aluminum oxide abrasive media); and basically does not contain elements with a more positive reduction potential than aluminum, thereby ensuring the purity of the electrolytic product aluminum(alumina sand). The melting point of normal cryolite is 1010°C, and it was also determined to be 1008.5°C(240 grit aluminum oxide). 


Then, in addition to the electrolysis of cryolite-alumina molten salt system to produce aluminum, the electroplating industry also uses low-temperature molten salt electrolysis using alumina as a raw material and aluminum organic salt electrolysis at room temperature(alumina abrasive). In order to electrolyze alumina into aluminum, alumina must be molten, ionized, and ions can migrate under the action of negative and anode electric fields(240 grit aluminum oxide).


However, the side with molar ratio less than 1.67 is the eutectic system of naalf and AIF below 695 ℃(240 grit aluminum oxide). Above this temperature, it may become a liquid phase or a co existing system of naalfa and corresponding solution (or naaif and corresponding solution, AIF and corresponding solution) according to different system composition(aluminium oxide sandblasting grit). Therefore, aluminum cannot be obtained by electrolysis in aqueous solution. 


In fact, this is the contribution of hall and ERU(100 grit aluminum oxide). So far, no better solvent has been found for alumina than the molten salt system composed of cryolite and other fluorides. Until now, aluminum can only be obtained by electrolysis in non-aqueous solvent(aluminum oxide grit blasting). It is found that alumina can be partially dissolved in cryolite with relatively low melting point, while alumina dissolved in cryolite can electrolyze aluminum. 


People have come down, it is possible to produce two compounds(240 grit aluminum oxide). The compound with composition (mass fraction) of naf60% and aif40% and molar ratio (NaF / AIF) of 3 is cryolite, or normal cryolite. It is a stable compound and can be expressed by the molecular formula naalf (or 3naf · ALF)(garnet sand). In industrial production, the molar ratio (pH) of the electrolyte is not static, and many factors can cause it to change.


One is an unstable compound, called cryolite, which can be represented by the molecular formula nasallfa (or 5naf · 3aif)(80 grit aluminum oxide). People have also tried to develop aluminum chloride and organic aluminum electrolysis into industrial production methods of aluminum, but they are still economically untenable(240 grit aluminum oxide). The composition (mass fraction) of cryolite is naf45.5%, aif54.5%, and its molar ratio (NaF / ALF) is 1.67(aluminium oxide sand).


Cryolite melt, as the electrolyte of modern aluminum electrolytic cell, has the following basic properties(240 grit aluminum oxide): alumina can be dissolved rapidly to form a uniform solution with good fluidity. It has good conductivity at the aluminum electrolysis temperature of about 950 ℃. The melting point of alumina is as high as 2050 ℃(aluminum oxide abrasive powder). It is impossible to use direct melting for electrolysis under current industrial conditions. 


Why does aluminum electrolysis use cryolite and fluoride as the electrolyte, and what are the basic properties of the electrolyte(steel grid)? Because aluminum has a strong affinity for oxygen, so far there has not been an economical way to obtain aluminum through direct reduction like some metals(240 grit aluminum oxide). The higher the relative content of NaF, the stronger the alkalinity; the higher the relative content of AIF, the stronger the acidity(70 grit aluminum oxide).


The in-depth study of the physical chemistry and electrochemical theory of molten salt(aluminum oxide sandblasting media), and the successful use of a variety of new materials in the electrolytic cell have enabled aluminum electrolysis to increase production capacity and labor productivity, reduce raw material consumption, improve product quality, reduce energy consumption, and protect the environment(240 grit aluminum oxide). Aluminum is more active than hydrogen.


LiF, like NaF, is a Lewis base, which can increase the electrolyte molar ratio(green silicon carbide). The influence of CaF and AL0 on the pH of the electrolyte is negligible(240 grit aluminum oxide). How to measure the pH of the electrolyte? For example, at the beginning of the opening of a new cell, NaF will penetrate into the carbon cathode and the carbon cell liner to reduce the molar ratio(180 grit aluminum oxide); the evaporation of AIF in the electrolyte will increase the molar ratio.


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