The invention discloses a preparation method of acid-modified superfine shell
powder. The preparation method is characterized by comprising the following steps: 1) removing the
cuticle of a shell
raw material, and then adding water accounting for 20-80% of the weight of the shell subjected to
cuticle removal, and stirring for 6 to 48 h to prepare
slurry; 2), adding acid liquor accounting for 5-25% of the weight of the shell subjected to
cuticle removal in the
slurry, and stirring to obtain acid-modified shell micro
powder slurry; 3), carrying out washing, filter pressing,
drying and
grinding on the acid-modified shell micro
powder slurry to obtain modified shell powder with the particle size of 0.5-5 microns; and 4), adding
purified water in the modified shell powder obtained from the steps 3), mixing into paste, and then adopting a planetary ball milling and
grinding method to process, dry and crush to obtain the superfine shell powder with the particle size of 0.01-5 microns. The invention further discloses acid-modified superfine shell powder prepared by the method. The preparation method and the product are simple in process, small in equipment investment and low in
energy consumption. Besides, the prepared modified shell micro powder is good in surface activity.