Vanadium
In 1801, a Spanish-Mexican mineralogist named Andrés Manuel del Río extracted compounds from a sample of Mexican brown lead ore. He observed that the salts exhibited a wide variety of colors and initially named the element panchromium to reflect this trait. Later, he renamed it erythronium because most salts turned red upon heating. In 1805, French chemist Hippolyte Victor Collet-Descotils declared the new element was merely an impure sample of chromium. Del Río accepted this statement and retracted his claim based on advice from Baron Alexander von Humboldt. Decades later, in 1831, Swedish chemist Nils Gabriel Sefström rediscovered the element while working with iron ores. He generated chlorides of vanadium and proved there was indeed a new element. Sefström chose a name beginning with V, which had not yet been assigned to any other element. He called the element vanadium after Old Norse Vanadís, another name for the Norse goddess Freyja. The choice honored the many beautifully colored chemical compounds produced by the substance. Friedrich Wöhler confirmed that Sefström's element was identical to that found by del Río. Despite del Río's passionate arguments to restore his original claim, the element kept the name vanadium.
Vanadium is an average-hard, ductile, steel-blue metal that resists corrosion. It remains stable against alkalis and hydrochloric acids at room temperature. An oxide passivation layer forms even at room temperature to protect the free metal. In air, the metal oxidizes at about 933 Kelvin or 660 degrees Celsius. Naturally occurring vanadium consists of one stable isotope known as 51V. A second radioactive isotope exists as 50V with a natural abundance of 0.25 percent. This rare isotope has a half-life of 2.71 times ten to the power of 17 years. Twenty-five artificial radioisotopes have been characterized ranging in mass number from 42 to 68. The most stable of these are 49V with a half-life of 330 days and 48V with a half-life of 15.97 days. Most remaining radioactive isotopes decay within an hour, many below 10 seconds. Electron capture serves as the main decay mode for isotopes lighter than 51V. Beta decay leads to element 24 chromium isotopes for heavier ones. Vanadium chemistry features four adjacent oxidation states from plus two to plus five. In aqueous solution, these states form distinct colors including lilac green blue and yellow-orange.
Most vanadium is mined in China South Africa and eastern Russia. In 2022 these three countries produced more than 96 percent of the 100,000 tons of global output. China alone provided 70 percent of that total. Historically, large deposits were found near Junín in Peru at the Minas Ragra mine. By 1920 roughly two-thirds of worldwide production came from this single Peruvian site. Modern extraction often occurs from vanadium-bearing magnetite found in ultramafic gabbro bodies. When titanomagnetite produces iron, most vanadium ends up in the slag. Producers extract the metal from this industrial waste product. Other sources include flue dust from heavy oil combustion or byproducts of uranium mining. Carnotite ore contains both uranium and vanadium making it a dual source. Fumaroles of the Colima Volcano deposit native vanadium minerals like shcherbinaite. Black shales also serve as potential sources of the element. During World War II some vanadium was extracted from alum shales in southern Sweden. Burning fossil fuels releases an estimated 110,000 tons of vanadium into the atmosphere annually.
Approximately 85 percent of all produced vanadium goes into steel alloys called ferrovanadium. The first large-scale industrial use appeared in the chassis of the Ford Model T. Vanadium steel allowed for reduced weight while increasing tensile strength significantly. This discovery inspired French race car engineers to adopt the material early on. High-speed tool steels contain between one and five percent vanadium content. These alloys achieve hardness above HRC 60 suitable for surgical instruments and cutting tools. Powder-metallurgic alloys can contain up to 18 percent vanadium carbides. Such high concentrations increase wear resistance dramatically for knives and industrial tools. Mixed with aluminum titanium alloys containing 2.5 percent vanadium became common for aerospace defense and bicycle industries. Another alloy known as Titanium 6AL-4V contains six percent aluminum and four percent vanadium. Nazi Germany utilized vanadium-based armor steel in vehicles like the Tiger II tank. A small amount between 40 and 270 parts per million improved Wootz steel strength historically. Modern superconducting magnets often use vanadium-gallium tape capable of generating 17.5 teslas.
The vanadium redox battery functions as an electrochemical cell using aqueous ions in different oxidation states. Cells utilize plus five and plus two formal oxidation state ions to store energy. Batteries of this type were first proposed during the 1930s but developed commercially from the 1980s onwards. They are now used commercially for grid energy storage solutions worldwide. One electrode uses the plus five plus four couple while the other uses the plus three plus two couple. Conversion of these states is illustrated by reducing a strongly acidic solution of vanadium compounds. The initial yellow color characteristic of the pervanadyl ion changes to blue then green and finally violet. Another potential battery based on VB2 allows for eleven electrons released per molecule. This design offers higher energy capacity compared to lithium-ion or gasoline per unit volume. Recharging remains a challenge despite claims of even higher energy density and lower weight than current alternatives.
Several species of marine algae produce vanadium bromoperoxidase enzymes that generate bromoform and bromomethane annually. Tunicates such as the bluebell tunicate contain vanadium stored in highly acidified vacuoles called vanadocytes. Concentrations reach ten million times higher than surrounding seawater which normally contains one to two micrograms per liter. Vanabins are proteins identified in the cytoplasm of these cells though their exact function remains unknown. Fungi like Amanita muscaria accumulate up to 500 milligrams per kilogram in dry weight. A coordination complex known as amavadin exists within fungal fruit-bodies. Deficiencies in vanadium result in reduced growth rates observed in rats. The U.S. Institute of Medicine has not confirmed vanadium as an essential nutrient for humans. Dietary intake is estimated at six to 18 micrograms daily with less than five percent absorbed. The Tolerable Upper Intake Level is set at 1.8 milligrams per day beyond which adverse effects may occur. Inhalation of vanadium compounds results primarily in adverse effects on the respiratory system. All vanadium compounds should be considered toxic with tetravalent forms being at least five times more toxic than trivalent ones.
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Common questions
Who discovered vanadium and when was it first identified?
Spanish-Mexican mineralogist Andrés Manuel del Río extracted compounds from Mexican brown lead ore in 1801. He initially named the element panchromium before renaming it erythronium later that same year.
Why did Nils Gabriel Sefström name the element vanadium instead of keeping del Río's original name?
Swedish chemist Nils Gabriel Sefström rediscovered the element in 1831 and chose a name beginning with V which had not yet been assigned to any other element. He called the element vanadium after Old Norse Vanadís to honor the many beautifully colored chemical compounds produced by the substance.
Which countries produce the majority of global vanadium output today?
China South Africa and eastern Russia mined more than 96 percent of the 100,000 tons of global output in 2022. China alone provided 70 percent of that total production volume.
What percentage of all produced vanadium goes into steel alloys called ferrovanadium?
Approximately 85 percent of all produced vanadium goes into steel alloys called ferrovanadium. The first large-scale industrial use appeared in the chassis of the Ford Model T where vanadium steel allowed for reduced weight while increasing tensile strength significantly.
How does the vanadium redox battery store energy using different oxidation states?
Cells utilize plus five and plus two formal oxidation state ions to store energy within an electrochemical cell using aqueous ions. Conversion of these states is illustrated by reducing a strongly acidic solution of vanadium compounds where the initial yellow color changes to blue then green and finally violet.