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2026
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Nationwide Exclusive! Zhongqi Silicon Material Breaks Ultra-Low Iron Silica Technical Barrier, Leading Industrial Technology Upgrade
Iron content serves as one of the core indicators evaluating silica quality in the food additive industry.
Iron content serves as one of the core indicators evaluating silica quality in the food additive industry. For a long time, the iron content of domestic food-grade silica generally stays below 500 ppm, while only a handful of manufacturers can reach around 200 ppm.
Leveraging self-developed core technologies, Zhongqi (Guangdong) Silicon Material Co., Ltd. manages to keep iron content under 100 ppm, with regular batches stabilized at approximately 50 ppm. The company is the sole domestic manufacturer capable of mass-producing such ultra-low iron silica.
This technological breakthrough stems from years of persistent investment in raw material purification and production processes. Conventional silica production adopts quartz sand with high iron content, and traditional steel ball milling brings secondary iron contamination.
Zhongqi innovatively applies an integrated process combining multi-stage magnetic separation, composite acid leaching and full-ceramic production.
High-purity quartz ore undergoes strict screening first. Three sets of magnetic separators with varying field strengths remove over 99% of magnetic iron-bearing minerals. High-temperature and high-pressure composite acid leaching dissolves encapsulated iron inside quartz crystal lattices. The entire production procedure adopts ceramic and plastic equipment to completely avoid iron contamination.
"The technology poses great challenges, demanding sophisticated facilities and precise process control," commented the chief engineer of the company. Every batch undergoes rigorous inspection to guarantee iron content below 50 ppm.
The product effectively eliminates ethyl maltol discoloration and boasts enhanced purity and stability. It is widely applicable to premium food scenarios sensitive to metal ions.
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