Silica, magnesium carbonate and sodium chloride prepared from talcum powder and preparation method of silica, magnesium carbonate and sodium chloride

The invention discloses silicon dioxide, magnesium carbonate and sodium chloride prepared from talcum powder and a preparation method of the silicon dioxide, magnesium carbonate and sodium chloride. The preparation method comprises the following steps: dispersing the talcum powder in water, adding the acid and the accelerant, uniformly stirring, placing in a closed reaction container, and heating and pressurizing for reaction; cooling, filtering to obtain a first filtrate and a first filter cake, washing, drying and scattering the first filter cake to obtain silicon dioxide; collecting the first filtrate, adding a sodium carbonate solution, standing and precipitating, and filtering to obtain a second filtrate; detecting the concentration of Mg < 2 + > in the second filtrate, adding the second filtrate into a sodium carbonate solution for reaction, and filtering after reaction to obtain a third filter cake and a third filtrate, the third filter cake being magnesium carbonate; and filtering and concentrating th