Overview
Cadmium is a naturally occurring element found in the Earth's crust, often associated with zinc ores. It was discovered in 1817 by German chemist Friedrich Stromeyer. Due to its unique properties, cadmium is widely used in industrial applications, particularly in rechargeable nickel-cadmium (Ni-Cd) batteries, which are known for their long life and reliability. Cadmium is also valued for its corrosion resistance and ability to form stable compounds, making it useful in pigments, coatings, and as a stabilizer in plastics. However, its toxicity has led to strict regulations on its use and disposal, particularly in consumer products.
Physical and Chemical Properties
Cadmium is a soft, malleable metal with a bluish-white appearance. It has a relatively low melting point (321.07 °C) and boiling point (767 °C), which makes it suitable for certain industrial processes. The metal is insoluble in water but dissolves readily in acids, forming cadmium salts. One of cadmium's key properties is its excellent electrical conductivity, which is why it is often used in batteries and electroplating. Additionally, cadmium exhibits high corrosion resistance, particularly in alkaline environments, making it ideal for use in Ni-Cd batteries and protective coatings.
Main Applications
The primary use of cadmium is in the production of nickel-cadmium (Ni-Cd) batteries, which are widely used in emergency lighting, medical equipment, and portable power tools. These batteries are prized for their durability and ability to deliver consistent power over long periods. Cadmium is also used in pigments, particularly cadmium sulfide (CdS), which produces bright yellow, orange, and red colors. These pigments are used in plastics, ceramics, and paints. Additionally, cadmium is employed in electroplating to provide corrosion-resistant coatings for steel and other metals. Other applications include stabilizers for PVC and control rods in nuclear reactors.
Safety and Storage
Cadmium is highly toxic, particularly when inhaled as dust or fumes. Prolonged exposure can lead to serious health issues, including kidney damage, lung disease, and bone softening. Proper handling procedures, such as using gloves, masks, and ventilation systems, are essential when working with cadmium. Storage of cadmium requires a cool, dry environment, away from acids and oxidizing agents. Containers should be tightly sealed to prevent the release of dust or fumes. Disposal of cadmium-containing waste must comply with local environmental regulations to prevent contamination of soil and water sources.
B2B Procurement Guide
When procuring cadmium, B2B buyers should prioritize suppliers who adhere to strict environmental and safety standards. Verify that the supplier provides material safety data sheets (MSDS) and complies with regulations such as REACH and RoHS. Price fluctuations for cadmium can occur due to market demand and availability of zinc ores, from which cadmium is often extracted. Buyers should also consider the form of cadmium required (e.g., powder, ingots, or rods) and ensure that the supplier can meet specific purity requirements, typically 99.95% or higher for industrial applications.
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