Method for preparing mineral type potassium-magnesium-silicon slow-release fertilizer from nephrite tailings

The invention discloses a method for preparing a mineral type potassium-magnesium-silicon slow-release fertilizer by using nephrite tailings, which comprises the following steps: S1, preparing raw materials, namely 3.30-5.00 parts of nephrite tailings, 0-3.04 parts of quartz sand and 3.77-5.72 parts of potassium carbonate, cleaning the prepared raw materials by using clear water, and after the raw materials are cleaned, drying the nephrite tailings, the quartz sand and the potassium carbonate by using a drying machine to obtain dried nephrite tailings, quartz sand and potassium carbonate; s2, putting the designed raw material components into a ball mill, mixing for 5-7 minutes, then taking out powder, carrying out sampling detection on the taken-out powder, and after sampling detection, screening the powder through a screening device to ensure that no large-particle raw material exists, S3 and S4. The potassium, magnesium, calcium and silicon compounds are prepared by mixing and sintering the raw materials, t