Overview
China Clay, or Kaolin, is a naturally occurring clay mineral composed primarily of kaolinite. It is named after the Gaoling village in China where it was first mined. Due to its fine particle size and plasticity, it is a vital raw material in various industries. Kaolin is chemically inert and has excellent binding properties, making it ideal for use in ceramics, paper coating, and paints. Its whiteness and brightness further enhance its value in industrial applications.
Physical and Chemical Properties
Kaolin is characterized by its white to off-white color and fine, powdery texture. It has a density of approximately 2.6 g/cm³ and a high melting point of around 1750°C, making it suitable for high-temperature applications. Chemically, kaolin is stable and insoluble in water, acids, and alkalis. Its particle size and surface area contribute to its plasticity and viscosity, which are critical in ceramic and paper industries.
Main Applications
Kaolin is extensively used in the ceramics industry to enhance the strength and whiteness of porcelain and sanitaryware. In the paper industry, it serves as a coating and filler to improve printability and opacity. Other applications include paints (as an extender), rubber (as a reinforcing agent), and cosmetics (as a mild abrasive). Its inertness and non-toxicity make it safe for use in food and pharmaceutical products as well.
Safety and Storage
While kaolin is non-toxic, prolonged exposure to its dust can cause respiratory irritation. Workers should use protective gear such as dust masks and gloves. Store kaolin in a dry, cool place to prevent moisture absorption, which can affect its quality. Bulk storage should be in sealed containers or silos to minimize contamination.
B2B Procurement Guide
When procuring kaolin, consider factors such as purity, particle size distribution, and moisture content. High-purity kaolin (above 90%) is preferred for premium applications like cosmetics and pharmaceuticals. Opt for suppliers with ISO certification and a proven track record in quality control. Prices vary based on grade and quantity, with bulk purchases often attracting discounts.
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