Overview
Calcined Hematite, known as 煅赭石 in Chinese medicine, is a processed form of hematite (iron oxide) used for centuries in TCM formulations. The calcination process involves heating raw hematite to high temperatures (600–900°C) to enhance its therapeutic properties and reduce impurities. It is classified as a mineral-based medicine with purported astringent, hemostatic, and antiemetic effects. In TCM theory, calcined hematite is believed to descend rebellious Qi (e.g., for nausea) and cool blood to stop bleeding. Modern studies suggest its efficacy may relate to iron content and electrochemical properties. The material is typically administered in powdered form, often decocted with other herbs or used in pill preparations.
Physical and Chemical Properties
Calcined Hematite primarily consists of iron(III) oxide (Fe₂O₃) with trace elements like silicon and aluminum. The calcination process converts the crystalline structure of raw hematite into a more porous form, increasing surface area and reactivity. Its reddish-black color distinguishes it from unprocessed hematite, which is brighter red. Key chemical properties include high thermal stability and insolubility in water, though it reacts slowly with strong acids. The material exhibits weak magnetism due to its iron content. Particle size varies by processing method, with TCM-grade powder typically sieved to 80–120 mesh for optimal bioavailability.
Main Applications
In TCM, calcined hematite is prescribed for conditions like hematemesis (vomiting blood), epistaxis (nosebleeds), and vertigo. It is a key ingredient in formulas such as Zhenzhong Dan (for gastric bleeding) and often combined with oyster shell or dragon bone for synergistic effects. Dosage ranges from 10–30 grams per decoction, adjusted based on practitioner guidance. Beyond medicine, it serves as a pigment in ceramics and coatings due to its stable color. Industrial uses include abrasives and heavy media separation. However, TCM applications demand higher purity (≥95% Fe₂O₃) and strict adherence to processing standards to ensure safety and efficacy.
Safety and Storage
While generally considered safe in TCM doses, prolonged inhalation of powder may cause respiratory irritation. Suppliers must confirm the absence of toxic heavy metals (e.g., lead, arsenic) through third-party testing. Proper storage in moisture-proof containers prevents oxidation and maintains potency. Contraindications include patients with iron overload disorders (e.g., hemochromatosis). TCM practitioners monitor for potential side effects like constipation due to its astringent nature. Regulatory compliance varies by region; EU and US importers often require additional heavy metal testing beyond Chinese pharmacopoeia standards.
B2B Procurement Guide
Buyers should prioritize suppliers with GMP (Good Manufacturing Practice) certification for TCM materials. Key procurement criteria include: iron oxide content (≥95% by XRD analysis), low heavy metal levels (e.g., <10 ppm lead), and batch-specific calcination temperature records. Pricing tiers depend on purity, with pharmaceutical-grade commanding a 20–30% premium over industrial-grade. Samples should be tested for solubility in dilute HCl (should be >90%) and sieved particle distribution. Reliable suppliers provide COA (Certificate of Analysis) with each shipment. For bulk orders (1+ metric tons), negotiate FOB prices from major hubs like Bozhou or Anguo herbal markets in China.
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