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The viewpoint that adding lime can strengthen the dissolution process of diaspore bauxite has been widely accepted by scholars all over the world and has been widely used in industry(glass beads supplier). The addition of lime can not only accelerate the dissolution rate and increase the dissolution rate of alumina, but also reduce the alkali content in red mud, the amount is 8% ~ 10%(120 grit aluminum oxide). 


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The practice shows that with the increase of lime addition(white alumina), the dissolution rate of Al2O3 is increased and the alkali consumption is significantly reduced, more Cao will be added to keep the same CaO / SiO2, but the dissolution rate of Al2O3 is not significantly reduced(black oxide aluminum). Figure S22 shows the relationship between the lime addition amount and the dissolution rate and alkali consumption of Al2O3 when diaspore is dissolved.


H. Merecier et al. Studied the effect of adding lime on the dissolution process of diaspore and diaspore mixed bauxite(black corundum). When the amount of lime is less than 5%, the dissolution rate of bauxite can be increased rapidly by adding lime. When the amount of squatting lime is more than 5%, the dissolution rate of bauxite will slowly decrease from the highest point(fused alumina). From the perspective of Al2O3 dissolution rate, there is an optimal proportion of lime.


In Bayer process, the amount of lime added is 3% ~ 5% in the treatment of diaspore ore, while in the mixed process(white fused alumina). However, it can be seen that even if the amount of lime added is more than 5%, the dissolution rate of Al2O3 will decrease very little. The mass ratio of Na2O / SiO2 is only related to Cao / SiO2, which has nothing to do with the silicon content(green carborundum). However, when the content of SiO2 is high, which will reduce the dissolution rate of Al2O3.


Chen wankun et al(white aluminum oxide). Studied the influence of the activity of lime on the dissolution process of diaspore type bauxite. When the activity of lime was very low, it hardly played a catalytic role in the dissolution of diaspore. When the lime stored for more than one year and the fresh lime were at 260 ℃, Na2O, 220g / L(arc fused alumina), and the dissolution time was 60min, the alumina was dissolved The difference of output rate is nearly 40%.


It can be seen from the figure that with the increase of lime addition, the alkali consumption is significantly reduced(white corundum). It can be seen from the figure that the activity of lime has a significant impact on the dissolution effect. They thought that the activity of lime had a great influence on the dissolution of diaspore(silicon carbide price). Therefore, at present, lime is not only used to treat diaspore type bauxite, but also used to treat diaspore type bauxite.


The relative dissolution rate of Al2O3 can differ by about 20%(brown fused alumina price). The shorter the dissolution time, the lower the concentration of caustic soda, the greater the impact. Cao Rongjiang et al. Studied the influence of additives on the dissolution process of diaspore(pink corundum). When MgO and dolomite were added, the dissolution curve of bauxite was as follows: Al2O3, 3100g / L, Na2O, 200g / 1, Na2O, c6g / L, mr3.29, temperature 523K.


white aluminium oxide
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