초록 ▼

In the production of an article of extremely pure synthetic silicon dioxide, wherein silicon tetrachloride is mixed with water to effect hydrolysis, the resulting hydrolysis product is dried, and the resulting dried particulate product is further processed into the desired article, the improvement w

In the production of an article of extremely pure synthetic silicon dioxide, wherein silicon tetrachloride is mixed with water to effect hydrolysis, the resulting hydrolysis product is dried, and the resulting dried particulate product is further processed into the desired article, the improvement which comprises employing a ratio of silicon tetrachloride to water so that the hydrolysis product is in the form of a gel, distilling by-product hydrochloric acid out of the gel, preliminarily drying the gel at 100°to 1000°C. to produce an initial product, milling the initial product into a fine granulate at room temperature, separating from the milled granulate a fraction with a particle size of about 40 to 1000 m

대표청구항 ▼

In the production of an article of synthetic silicon dioxide, wherein liquid silicon tetrachloride is introduced while being stirred into an excess of water to effect liquid-phase hydrolysis, the resulting hydrolysis product is dried, and the resulting dried particulate product is further processed

In the production of an article of synthetic silicon dioxide, wherein liquid silicon tetrachloride is introduced while being stirred into an excess of water to effect liquid-phase hydrolysis, the resulting hydrolysis product is dried, and the resulting dried particulate product is further processed into the desired article, the improvement which comprises employing a ratio of silicon tetrachloride to water so that the hydrolysis product is in the form of a gel, distilling by-product hydrochloric acid out of the gel, transferring the resulting silicon dioxide to an oven, preliminarily drying the silicon dioxide in said oven at 100°to 1000°C. to produce an initial product, milling the initial product into a granulate at room temperature, separating from the milled granulate a fraction with a particle size of about 40 to 1000 mm, and drying the screened-out granulate fraction while slowly heating to no more than 1400°C. to form the resulting dried particulate product that is further processed into the desired article.