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Brown Fused Aluminum Oxide Manufacturers Austria

The so-called stability of sodium aluminate solution refers to the time required for the decomposition and precipitation of brown aluminum oxide 70 grit hydroxide from supersaturated sodium aluminate solution. The greater the degree of supersaturation of sodium aluminate solution, the lower its stability. The white aluminum oxide 220 grit main factors affecting the stability of sodium aluminate solution are as follows. 


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When the molecular ratio of glass beads manufacturers sodium aluminate solution is the same under other conditions, the lower the molecular ratio, the greater the degree of supersaturation and the lower the stability of the solution. With the increase of the molecular ratio, the time required for the solution to start to precipitate the solid phase is also increased, the solution is in the equilibrium state, glass beads supplier and very fine iron hydroxide particles grow up through gelation. 


(brown fused aluminum oxide manufacturers austria)For the same Al2O3 concentration, when the pink corundum molecular ratio is Mr: the solution is in the unsaturated state and still can dissolve Al2O3, while when the molecular ratio is reduced to MR2, while when the molecular ratio is reduced to mr3 again, the solution is in the oversaturated state and the solution is in the unstable state, black oxide aluminum and Al (OH) 3 will be precipitated. The time required for this decomposition to begin is called the "induction period".


It can be seen from the state isothermal cross section that the curvature of the isotherm increases with the decrease of the brown fused alumina solution temperature at atmospheric pressure, so when the molecular ratio of the solution is fixed, the supersaturation degree of the medium fused alumina concentration (Na2O, 50-160g / L) sodium aluminate solution is greater than that of the thinner or more concentrated solution, its stability will be significantly improved.(brown fused aluminum oxide manufacturers austria)


It shows that the medium brown aluminum oxide concentration of sodium aluminate solution has the least stability and the shortest induction period. Above 360 ℃, there are only corundum, anhydrous sodium aluminate and sodium oxide in the whole concentration range of na2o-al2o3-h2o system. Impurities contained in the solution ordinary sodium aluminate solution contains some solid impurities, such as iron hydroxide and arc fused alumina sodium titanate, etc.


(brown fused aluminum oxide manufacturers austria)For example, when the molecular ratio of sodium aluminate solution is 1.7, brown aluminium oxide and the concentration of Na2O is 50-160g / L, Al (OH) 3 begins to precipitate after 2-5d at room temperature; when the concentration of Na2O is 160-250g / L, it takes 14-30d; when the concentration of Na2O is 25g / L, it takes longer for Al (OH) 3 to decompose. SiO2 can form a large volume of aluminosilicate complex ion in the solution, silicon carbide price which increases the viscosity of the solution.


It is very similar to boehmite, so it acts as the crystallization center of white alumina hydroxide. However, sodium titanate is a highly developed porous structure on the surface, which is easy to absorb sodium aluminate, reducing the molecular ratio of the solution near the surface, and aluminum hydroxide precipitates and deposits on the green carborundum surface, thus playing the role of crystal seeds. The presence of these impurities reduces the stability of the solution.(brown fused aluminum oxide manufacturers austria)


However, if the purified sodium aluminate solution (for example, the sodium aluminate solution is centrifuged by an ultracentrifuge, black corundum and the particles with a diameter greater than 20 mm are removed from the solution). However, the majority of impurities in industrial sodium aluminate solution, silicon carbide companies such as SiO2, Na2SO, Na2S and organic matters, improve the stability of industrial sodium aluminate solution to varying degrees.


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