Potassium
Overview
Potassium is the 19th element in the periodic table and one of the alkali metals. It was first isolated in 1807 by Sir Humphry Davy through electrolysis of caustic potash (KOH). As the seventh most abundant element in Earth's crust, potassium occurs naturally only in ionic salts due to its extreme reactivity. In nature, potassium is crucial for plant growth and human physiology, regulating nerve impulses and muscle contractions. Industrially, it's primarily obtained through electrolysis of potassium chloride (KCl) or thermal reduction methods. Global production exceeds 350,000 tons annually, with major producers located in Canada, Russia, and Germany.
Physical and Chemical Properties
Potassium is softer than sodium and can be cut with a knife. It has a low melting point (63.5°C) and the second-lowest density of all metals (after lithium). Its single valence electron makes it highly electropositive, reacting vigorously with water to form potassium hydroxide (KOH) and hydrogen gas, often igniting spontaneously. The metal tarnishes rapidly in air, forming a layer of potassium oxide (K₂O) and potassium peroxide (K₂O₂). In moist air, it reacts to form potassium hydroxide. Unique among alkali metals, potassium forms a stable superoxide (KO₂) when burned in oxygen. Its flame test produces a distinctive lilac color.
Main Applications
Over 95% of potassium production is used in agriculture as potash fertilizers (K₂O equivalent), essential for crop yield and quality. Industrially, potassium compounds serve in glass manufacturing (K₂CO₃), soaps (KOH), and food preservation (KNO₃). Metallic potassium has niche uses in heat transfer alloys (NaK) for nuclear reactors and as a reducing agent in chemical synthesis. Potassium chlorate (KClO₃) is used in matches and pyrotechnics, while potassium permanganate (KMnO₄) serves as a disinfectant. Recent research explores potassium-ion batteries as a potential alternative to lithium-ion technology.
Safety and Storage
Potassium metal requires careful handling due to its pyrophoric nature. Storage under anhydrous mineral oil or argon gas is mandatory to prevent violent reactions with atmospheric moisture. Firefighting requires Class D extinguishers (e.g., Met-L-X) - water or CO₂ will exacerbate fires. Workers must wear alkali-resistant PPE, including face shields and neoprene gloves. Spills should be covered with dry sand or NaCl and disposed as hazardous waste. Transportation follows UN 2257 regulations (Dangerous Goods Class 4.3). Facilities should have emergency showers and acid neutralization solutions (e.g., boric acid) readily available.
B2B Procurement Guide
Industrial buyers should specify required purity (typically 98-99.9%) and form (ingots, dispersion, or ampouled). Key suppliers include BASF, Evonik, and Albemarle. Bulk shipments usually use steel drums with inert gas blanket (50-100kg units). Quality verification should include atomic absorption spectroscopy for metal purity and moisture testing. Consider long-term contracts due to price volatility linked to energy costs. For international shipments, ensure compliance with IMDG/IATA regulations. Secondary suppliers are recommended due to potential supply chain disruptions in major producing regions.
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