Overview
Hematite is one of the most abundant iron oxide minerals on Earth and a primary ore of iron. Its name derives from the Greek word 'haima' meaning blood, referring to the red color of its powdered form. Hematite has been used since prehistoric times as a pigment and continues to be economically important today. This mineral forms in various geological environments, including sedimentary, metamorphic, and igneous rocks. While typically gray or black in crystalline form, hematite produces a characteristic reddish streak when rubbed against a rough surface, which helps in its identification.
Physical and Chemical Properties
Hematite exhibits several distinctive physical properties. It has a high specific gravity (5.26), significantly heavier than most common minerals. The mineral shows varying degrees of metallic to submetallic luster and can appear either crystalline or earthy in form. Chemically, hematite is quite stable under normal conditions but can be reduced to metallic iron at high temperatures. It's insoluble in water but dissolves slowly in hydrochloric acid. Some varieties of hematite display weak magnetism, particularly those that contain traces of magnetite.
Main Applications
The primary use of hematite is as an iron ore for steel production. About 98% of mined iron ore is used to make steel, with hematite being one of the most important sources globally. Beyond metallurgy, hematite finds use in various industrial applications. In the pigment industry, finely ground hematite produces red ochre used in paints, coatings, and cosmetics. Its density makes it valuable for radiation shielding and as a weighting agent in drilling fluids. Polished hematite serves in jewelry and ornamental objects, while synthetic hematite is used in magnetic recording media.
Safety and Storage
While hematite is generally considered non-toxic, precautions should be taken when handling its dust. Inhalation of fine particles may cause respiratory irritation, and eye contact should be avoided. Appropriate personal protective equipment including dust masks and safety goggles is recommended during processing. For storage, hematite should be kept in dry conditions to prevent moisture absorption and potential caking. Bulk storage should be in sealed containers or covered piles to minimize dust generation. The material is not flammable but should be kept away from strong reducing agents that could cause hazardous reactions.
B2B Procurement Guide
When procuring hematite for industrial use, several factors require consideration. The iron content is paramount - commercial grades typically range from 50% to 70% Fe. Particle size distribution affects processing efficiency, so specifications should match intended use (e.g., pelletizing vs. direct reduction). Buyers should request certificates of analysis for purity and contaminant levels, particularly for applications like pigments or pharmaceuticals. Transportation costs significantly impact total procurement cost due to hematite's high density. Establishing long-term contracts with reliable suppliers helps stabilize pricing in this commodity market.
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