Method for protecting aluminum electrolysis cell cathode block having baked anode, protective composite mixture and coating

The invention relates to the field of non-ferrous metallurgy, namely electrolytic deposition of aluminum, which can be used for protecting a cathode block of an aluminum electrolysis cell with a baked anode so as to reduce the abrasion of the cathode block and prolong the service life. To this end, a method for protecting a cathode block of an aluminum electrolysis cell having a baked anode is proposed, comprising the preparation of a mixture of a heat-resistant material and an adhesive, the application of the mixture as a coating on the surface of the cathode block as a function of the wear of the bottom, and the drying of the coating. Meanwhile, titanium diboride powder or a bimodal or multimodal mixture of titanium diboride powder is adopted as a heat-resistant material, and the characteristic of the particle size composition of the heat-resistant material conforms to bimodal or multimodal particle size distribution, so that the process performance is improved during the suspension preparation period, and