Cuprous oxide is an oxide of univalent copper with the molecular formula Cu2O, red to reddish brown crystalline or powder. It is insoluble in water and organic solvents, but soluble in dilute hydrochloric acid, dilute sulfuric acid, ammonium chloride solution. Dissolve in a solution of concentrated ammonia to form a colorless complex Cu(NH3)2+, which is oxidized in air to blue [Cu(NH3)4(H2O)2]2+.Cuprous oxide is decomposed into copper and oxygen at 1800℃. It is stable in dry air, but is slowly oxidized to copper oxide in moist air.
There are three main preparation methods for cuprous oxide, which are dry methods. After removing impurities, the copper powder is mixed with copper oxide and sent to the calcining furnace for heating to 800 ~ 900℃ for calcining into cuprous oxide. After taking it out, the mechanical impurities were removed by magnet and then crushed to make cuprous oxide. In the glucose reduction method, copper sulfate solution was mixed with glucose and then sodium hydroxide solution was added for reaction to produce cuprous oxide. Cuprous oxide was prepared by filtering, rinsing, drying and grinding. Direct oxidation of copper was performed by using platinum wire to lift copper in a vertical tubular furnace and heating it at 1000℃ for 24 hours in a nitrogen atmosphere containing 1% oxygen.
Cuprous oxide is used to make antifouling paints on ship bottoms (killing low-grade Marine animals).Used as fungicide, colorant for ceramics and enamel, red glass dye, also used in the manufacture of various copper salts, analytical reagents and used in the electrical industry rectifier electroplating, crops fungicide and rectifier materials, and often used in catalyst action in organic synthesis.
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