The surface area as determined by nitrogen adsorption, is a function of particle size. The particle size in gynogenic silica’s is controlled by combustion conditions. Ultimate & aggregate particle size in silica’s precipitated from solution can be varied by reinforcement & control of suspension pH., temperature & salt content. The physical & chemical properties or precipitated silica vary according to the manufacturing process. It was reported in 1640 that amorphous silica in the presence of excess alkali become a liquid & that subsequent neutralization of the liquid with acid caused precipitation of silica. Amorphous silica is precipitated from super saturated solution obtained by concentrating an under saturated solution a hot saturated solution or generating Si(OH)4 of silica ester SiH4, SiS2, SiCl4 or Si. Precipitated silica powders have a more open structure with higher volume than dried pulverized gels. Precipitated silica prepared by the action of acid on a solution of soluble silicate is of fine controlled particle size & porous in nature. Precipitated Silica is composed of aggregates of ultimate particles of colloidal size that have not become linked in massive gel network during the preparation process. Precipitated Silica - Manufacturing Plant, Detailed Project Report, Profile, Business Plan, Industry Trends, Market Research, Survey, Manufacturing Process, Machinery, Raw Materials, Feasibility Study, Investment Opportunities, Cost And Revenue
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