The invention relates to a flocculant used for purifying the
water quality, and in particular relates to a preparation method of
solid polymeric
ferric chloride silicate flocculant. The preparation method comprises the following steps of: selecting concentrated
hydrochloric acid and injecting the selected concentrated
hydrochloric acid into water to prepare diluted
hydrochloric acid; taking
liquid state sodium silicate and putting the
liquid state sodium silicate into water to obtain
sodium silicate water solution; adding the diluted hydrochloric acid into a reaction tank, slowing injecting the
sodium silicate water solution into the reaction tank, and putting
ferric trichloride into the reaction tank for a plurality of times for dissolving; standing still to form polymeric iron silicate; and micro-heating to obtain the
solid polymeric
ferric chloride silicate flocculant. The flocculant only contains two raw materials including Fe and Si, wherein Fe is non-toxic and is essential
trace element of the
human body, and iron-deficiency
anemia can be caused when the
human body is lack of the Fe; Si has the function of promoting development and growth; and when the metasilicic
acid content in drinking water is more than 25mg / L, the drinking water belongs to
mineral water and can be used for preventing diseases after being drunk for a long time, thus having the health care function of prolonging the life. The flocculant not only has excellent
turbidity removal function, but also can remove harmful substances such as heavy
metal, thus being beneficial to the health of
human body.