Process method for preparing compact calcium hexaluminate refractory clinker by one-step method

The invention relates to a process method for preparing a compact calcium hexaluminate refractory clinker by a one-step method. The compact calcium hexaluminate refractory clinker comprises the following components in percentage by weight: 387.96-89.79% of Al2O3, 8.04-8.21% of CaO and 2.00-4.00% of mixed powder, which is composed of La2O3 and TiO2 according to a weight ratio of 1:1. The relative density is 91.30-94.60%, and the apparent porosity is 2.80-4.50%. The preparation method comprises the following steps: (1) respectively grinding bauxite, limestone and mixed powder, which is composed of La2O3 and TiO2 according to a weight ratio of 1:1, and then mixing; and (2) pressing the mixture into green pellets, and calcining to obtain clinker. According to the invention, mixed powder, which is composed of La2O3 and TiO2 according to a weight ratio of 1:1, is used as a sintering promoter, and is dissolved in a calcium hexaluminate phase to form a solid solution in the calcining process, so that the sintering ac