Method for preparing micro-nano spherical silicon dioxide by using micro-silicon powder

Abstract

The invention discloses a method for preparing micro-nano spherical silicon dioxide by using micro-silicon powder. The method specifically comprises the following steps: step 1, purifying the micro-silicon powder; 2, dissolving the silica fume obtained in the step 1 by using hydrofluoric acid to obtain a solution A; step 3, adding sodium dodecyl benzene sulfonate into the solution A to obtain a solution B; step 4, mutually dissolving ammonia water with a polyethylene glycol solution or ethanol, and adding sodium dodecyl benzene sulfonate to obtain a solution C; 5, the solution B is placed in a water bath kettle for water bath heating and stirring, then the solution C is slowly added into the solution B, adding of the solution C is stopped until the pH of the solution B is 9, then heating stirring is conducted, aging is conducted after heating stirring is completed, and a solution D is obtained; step 6, carrying out vacuum suction filtration on the solution D, washing the obtained product with deionized water added with sodium dodecyl benzene sulfonate, and then carrying out alcohol washing with ethanol; and 7, drying the product obtained in the step 6 in a drying box, and grinding.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic oxides, and in particular relates to a method for preparing micro-nano spherical silica by using micro-silicon powder. Background technique [0002] Silica fume is a by-product associated with the production of ferrosilicon, commonly known as "silica fume". The raw materials for ferrosilicon production are quartzite and pig iron, adding coke as a reducing agent, and reacting in a high-temperature electric furnace. Quartz is reduced to form simple silicon, and silicon vapor is oxidized by oxygen in the flue to form silicon monoxide, and the flue is oxidized by oxygen to form silicon dioxide. At the same time, other metal impurities are mixed in and condensed and crystallized in the air. Micro-silicon powder is formed by fine particles. [0003] my country is the largest steel producer in the world, and the output of ferrosilicon and metal silicon ranks in the forefront, and the o...

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Problems solved by technology

[0004] The main component of micro silica fume is amorphous SiO 2 , which has high activity, small particles, large specific surface area, and excellent physical and chemical properties, but because of its high impurity content (such as C, Fe, Cu, K, Na, Ca, Mg, etc.), its application value is low, resulting in Long-term accumulation, if not used rationally, will not only waste resources, increase operating costs of enterprises, but also cause pollution to the environment and cause harm to human health

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