Stone powder purification process

The invention relates to a stone powder purification process. Solid particle stone powder and liquid stone powder are sequentially conveyed to a shaftless roller slurrying sieve for slurrying, a screening machine, a primary static separator, a primary wet type strong magnetic plate type magnetic separator, a secondary vertical ring high gradient magnetic separator, a tertiary vertical ring high gradient magnetic separator, a primary cyclone, an electromagnetic slurry magnetic separator, a secondary cyclone, a tertiary cyclone and a secondary static separator, grading is carried out on ore concentrate slurry with the size of 30-2000 meshes or below, ore concentrate slurry with the size of 80 meshes or above is dehydrated and discharged through washing through a spiral classifier, ore concentrate slurry with the size of 80 meshes or below is concentrated through a concentrator and then dehydrated and discharged through a ceramic filter and an efficient energy-saving diaphragm filter press. By means of the stone