Multifunctional dust-free composite mineral sand for pests and preparation method thereof

The invention discloses a multifunctional dust-free composite mineral sand for pests. The sand comprises following raw materials in percentage by weight: 20 to 25% of vermiculite, 65 to 75% of bentonite, 0 to 5% of attapulgite, 0 to 5% of meerschaum, 1 to 5% of compounded active carbon powder, 0.1 to 0.5% of silver ion solution, and 0.1 to 1% of compounded tourmaline powder; wherein the total percentage by weight is 100%. The preparation method comprises following steps: preparing raw materials; adding vermiculite, part of bentonite, and compounded active carbon powder into a rolling ball granulator, adding water, carrying out primary granulation; adding residual bentonite, attapulgite, meerschaum, and compounded tourmaline powder into the rolling ball granulator, adding water, carrying out secondary granulation; adding a silver ion solution into the rolling ball granulator, carrying out tertiary granulation; burning the granules at a temperature of 100 to 200 DEG C to obtain the sandfor pests. The processing