Purification and activation method of low-grade argillaceous diatomite

The invention belongs to the technical field of purification of non-metallic ore diatomite, and particularly relates to a purification and activation method of low-grade argillaceous diatomite, which comprises the following steps: (1) sieving; (2) roasting treatment; (3) preparing ore pulp, adding sodium hydroxide to adjust the pH value, scrubbing, settling and separating; (4) carrying out ultrasonic scrubbing and wet magnetic separation to obtain magnetic concentrate; and (5) carrying out acid leaching, washing to be neutral, and drying in a drying oven to obtain refined diatomite. The method has the advantages that clay impurities in channels of the diatomite can be effectively removed, the adsorption and desorption efficiency of the diatomite is remarkably improved, the activity of the diatomite is effectively improved, the content of SiO2 in refined diatomite can be larger than or equal to 83 wt%, and the specific surface area is larger than or equal to 85 g/cm < 3 >; and clay, organic matters and other i