[China Aluminum Network] 1 magnesium fluoride can reduce the melting point of the electrolyte.
2 Magnesium fluoride can increase the surface tension of the electrolyte, which has a beneficial effect on reducing the re-dissolution loss of aluminum and promoting the separation of carbonaceous slag in the electrolyte; therefore, MgF2 indirectly acts to increase the conductivity of the electrolyte, MgF2 in this respect The effect is greater than calcium fluoride.
3 Magnesium fluoride is a mineralizer that accelerates the a-Al2O3 ore ratio effect, which is beneficial for forming a stable crust on the side wall of the electrolytic cell. 4 In addition, the addition of MgF2 electrolyte crust is crisp and good.
However, the disadvantage is that magnesium fluoride will reduce the solubility and dissolution rate of alumina to a certain extent, increase the electrolyte density, and slightly reduce the electrical conductivity. Therefore, MgF2 is only added along the furnace, and it is not added inside, so as to avoid A large amount of precipitate was generated under the anode. China's aluminum plant has implemented the "diligent processing, less material" operation method, which can make up for the shortcomings caused by the addition of MgF2. Therefore, magnesium fluoride is a beneficial additive. The addition is generally 4-6%, and the effect of adding calcium fluoride is substantially consistent with that of MgF2.
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