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2 hours ago · Phosphate rock, which usually contains calcium phosphate, was first used in 1850 to make phosphorus, and following the introduction of the electric arc furnace by James Burgess Readman in 1888 [56] (patented 1889), [57] elemental phosphorus production switched from the bone-ash heating, to electric arc production from phosphate rock. After the depletion of world guano sources about the same ...
2 hours ago · The most common catalysts are silver metal, iron(III) oxide, [38] iron molybdenum oxides (e.g. iron(III) molybdate) with a molybdenum-enriched surface, [39] or vanadium oxides. In the commonly used formox process , methanol and oxygen react at c. 250–400 °C in presence of iron oxide in combination with molybdenum and/or vanadium to produce formaldehyde according to the chemical equation ...
1 day ago · Irrigation (also referred to as wateringof plants) is the practice of applying controlled amounts of water to land to help grow crops, landscape plants, and lawns. Irrigation has been a key aspect of agriculture for over 5,000 years and has been developed by many cultures around the world. Irrigation helps to grow crops, maintain landscapes ...
