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09
2026
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04
Comparison of Production Processes of Food-Grade Silicon Dioxide: Efficiency Difference Between Precipitation Method and Fumed Method
Food-grade silicon dioxide is mainly produced by the precipitation process and the fumed process.
Food-grade silicon dioxide is mainly produced by the precipitation process and the fumed process. The two differ significantly in raw materials, production techniques and product properties, which determine their respective application scenarios and costs.
The precipitation process uses sodium silicate and sulfuric acid as raw materials. Precipitates are formed through reaction under alkaline conditions, followed by washing and drying. Featuring a simple process and easy industrialization, it enjoys a relatively low cost (RMB 20–30/kg), but has a small specific surface area (50–400 m²/g) with a purity mostly ranging from 99.0% to 99.5%.
The fumed process takes silicon tetrachloride and hydrogen as raw materials, which are hydrolyzed in an oxyhydrogen flame. The resulting product boasts a large specific surface area (200–350 m²/g), excellent dispersibility and a purity of over 99.8%. However, it involves complex processes and high energy consumption, with a cost 2–3 times that of the precipitation process (RMB 60–80/kg).
In terms of application adaptability, precipitation-process products are suitable for anti-caking purposes in staple foods such as salt and condiments, while fumed-process products meet the stability requirements of high-end foods including milk powder and plant protein beverages.
Our company’s strength lies in its dual-process layout:
The annual production capacity of the precipitation-process production line reaches 50,000 tons, ensuring stable supply for the mass market;
Through technical optimization, the fumed-process production line has achieved a 20% cost reduction, with product performance approaching that of Evonik Sipernat® series, realizing domestic substitution in the high-end market.
We can quickly switch production processes based on customer needs and provide cost-effective solutions.
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