Overview
Macroporous Maifan Stone is a naturally occurring mineral rock composed primarily of silicate minerals, including feldspar, quartz, and biotite. Its unique honeycomb structure and rich trace elements (e.g., zinc, selenium) make it valuable for industrial and consumer applications. First documented in traditional Chinese medicine, it gained modern recognition for its adsorption and ion-exchange properties. Unlike processed filter media, it requires no chemical activation, aligning with eco-friendly industrial trends.
Physical and Chemical Properties
The stone’s porosity (20–30% void volume) enables high surface area for adsorption, effectively removing heavy metals like lead and cadmium from water. Chemically inert, it gradually releases beneficial minerals (e.g., calcium, iron) without altering water’s oxidative properties. Its hardness ranges 5–6 Mohs, suitable for mechanical grinding into granules. Laboratory tests show 90%+ adsorption efficiency for chlorine and ammonia nitrogen, making it superior to activated carbon in specific scenarios. Thermal stability up to 800°C allows reuse after calcination.
Main Applications
In water treatment, macroporous Maifan Stone is packed into filtration systems for residential and industrial wastewater, notably in aquaculture to reduce nitrates. Agriculture utilizes its mineral-rich composition to enhance soil fertility and moisture retention. The health product industry embeds it in ceramic balls for alkaline water pitchers or mattresses for far-infrared radiation. Emerging uses include slow-release fertilizer carriers and air purification substrates in construction materials.
Safety and Storage
Non-reactive and non-toxic, it complies with FDA and EU food-contact material regulations. However, prolonged exposure to acidic solutions (pH <4) may leach aluminum ions, requiring pH monitoring in closed-loop systems. Storage requires protection from humidity to prevent microbial growth in pores. Bulk shipments should use moisture-proof pallets with a maximum stack height of 2 meters to avoid structural crushing.
B2B Procurement Guide
Prioritize suppliers providing XRD (X-ray diffraction) analysis to confirm mineral ratios. For water treatment, demand pore distribution reports—optimal pore diameters are 1–10 μm for microbial adsorption. Negotiate pricing based on particle size: 1–3 cm granules command 20–30% premiums over crushed variants. Spot contracts are common, but long-term agreements (12+ months) secure 10–15% discounts. Sample testing for arsenic/lead content is critical for EU/US imports.
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