TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The silicate solution is added to the sample or the precipitating suspension in the form of drops, in such a way that the silicate solution is added through a suitable metering unit to the sample or the precipitating suspension. The addition of the silicate solution is carried out from outside of the sample or precipitating suspension and/or by immersing the metering unit in the sample or precipitating suspension. The separation of the silicon dioxide is carried out by filtration, centrifugation and/or by decanting the liquid components of the precipitating suspension. Between the step (c) and step (d), no further steps are carried out. The washing is carried out for a longer time, until the suspension obtained in the step (c) together with the wash medium shows no more yellow color. After washing with the wash medium, an additional washing is done with distilled water, until the pH of the resulting silicon dioxide is 4-7.5 and/or the conductivity of the wash suspension is less than or equal to 9 mu s/cm, preferably less than or equal to 5 mu s/cm. The method does not comprise the calcination step. Preferred Components: The sample besides the acidifying agent also comprises peroxide, which gives yellow or orange compound with titanium(IV) ions, under acidic conditions. The wash medium consists of a diluted or undiluted acidifying agent or a mixture of several diluted or undiluted acidifying agents. The acidifying agent is hydrochloric acid, phosphoric acid, nitric acid, sulfuric acid, chlorosulfonic acid, sulfuryl chloride and/or perchloric acid in a concentrated or diluted form. EXAMPLE - Water glass (27.2 wt.% of silicon dioxide and 7.97 wt.% of sodium oxide) (1808 g) and 50% sodium hydroxide (20.1 g) were added to a round bottomed flask. The sodium hydroxide was added to increase the sodium oxide content in the concentrated water glass. Then the solution was superimposed with nitrogen to react with the carbon dioxide obtained from the air to heat the reaction mixture to boiling. Then water (256 ml) was distilled off and the reaction mixture was boiled for 100 minutes under reflux. Then the concentrated water glass under the nitrogen atmosphere was cooled to room temperature and allowed to stand overnight to obtain concentrated water glass (1569 g) with a viscosity of 537 mPa. Then 16.3% sulfuric acid (2513 g) and 35% hydrogen peroxide (16.1 g) were taken and within 3 minutes previously prepared concentrated water glass was added to it drop wise at room temperature, so that the pH value of the mixture remained at less than 1. Then the reaction mixture was warmed to 50 degrees C and the color of the reaction mixture turned deep orange. The suspension was stirred for 20 minutes to obtain the resulting solid. Then the supernatant solution was decanted from the reaction mixture and a mixture of deionized water (500 ml) and 96% sulfuric acid (50 ml) was added to the residue and stirred. The suspension was heated to boiling and after the solids got settled at the bottom, the supernatant was decanted again. The washing process was carried out with a wash medium and repeated until the supernatant showed a very faint yellow color. Then the residue was additionally washed with deionized water (500 ml) to attain the pH of 5.5 of the wash suspension. Then the supernatant was decanted and dried at 105 degrees C for overnight in circulating air to obtain the silicon dioxide.