Potassium cryolite molten salt also has serious corrosion on inert anode and side lining materials, so it is necessary to further find suitable inert anode and side lining materials.

One of the problems of potassium cryolite electrolyte is that the conductivity is low, resulting in a large ohmic drop. Although it can be compensated by adding LIF and other additives and reducing the polar distance, the additives not only improve the conductivity, but also reduce the solubility of alumina and increase the primary crystallization temperature. At the same time, the reduction of polar distance also depends on the industrial application of wettable cathode.

In addition, in the process of low-temperature electrolysis, K + is enriched in the cathode, and the electrolyte molecular ratio near the cathode increases, resulting in cathode crusting. The common phenomenon in the electrolysis process with potassium cryolite as electrolyte is that the cell voltage is high and fluctuates greatly, and the current efficiency is low. Although the research of potassium cryolite electrolyte has received a certain degree of attention, it is far from enough compared with the research of sodium cryolite. Its physicochemical properties have only been preliminarily studied and have not been systematized. The existing data are few and imperfect, and the data reported in the literature are inconsistent. The existing studies mainly focus on the physicochemical properties such as conductivity, alumina solubility and primary crystallization temperature, while there are very few studies on the physicochemical properties such as density, surface tension and viscosity. Therefore, it is necessary to further study the physicochemical properties of potassium cryolite. In addition, the thermodynamic data of potassium cryolite electrolyte system is also relatively lacking, and the understanding of molten salt structure is not in-depth. These aspects need to be further studied.

The industrial application of potassium cryolite electrolyte not only needs to find suitable inert anode materials, but also needs more research on electrolysis process and optimization process. In addition, the research on the corrosion and penetration of potassium salt to carbon cathode and wettable inert cathode is also one of the important conditions for its industrial application.