White carbon balck can be used as natural rubber and synthetic rubber reinforced filler, synthetic resin filler, ink thickener,anti-precipitation agent of paint and pigments , also can be used as pesticide carrier. Precipitation method is an important method for the preparation of silica, precipitation method contains a sulfuric acid precipitation method and hydrochloric acid precipitation method.
The sodium chloride aqueous solution and the diluted aqueous sodium silicate solution were put into the stirring tank proportionally, and the mixture was sufficiently stirred to crystallize the silica (SiO2 · nH2O) containing crystal water. Then, the pH of the reaction solution was adjusted to neutral with dilute hydrochloric acid with stirring. At room temperature for 6 to 12 hours, followed by filtering the precipitated aqueous silica and washing with deionized water for 3 to 5 times so that the Na + content in the product is less than 0.5% and then dried to a moisture content of less than 6% To a fineness of less than 20 μm, that is finished.
Hydrochloric acid method is to prevent silicic acid into the silicone gel, in the preparation process, to strictly control the PH and try to select the nearest gel point for the best control value, followed by the process of reprecipitation to control the temperature of 50 ~ 80 ℃, PH in 6.0 -8.0, if necessary, by adding NaCl to precipitate the original particles
The advantage of using hydrochloric acid precipitation method of making white carbon black, the producing process is more simple, product quality to meet the requirements, and less land, less investment, quick, can then invest in the year income, no waste discharge.It will not cause too much impact on the environment.