What is Selenium powder?
Selenium powder (Selenium), chemical formula Se, black-gray non-metal, soluble in concentrated sulfuric acid and chloroform, slightly soluble in carbon disulfide, toxic, insoluble in water, and ethanol.
Selenium powder is usually in powder or granular form, with pure appearance, consistent color, purity up to 99.99%, no impurities such as soil, stable composition, and uniform moisture.
Preparation and source of selenium powder
Selenium is a rare element. There is no independent selenium production plant in the world. Generally, selenium is associated with the electrolysis of copper and nickel, which is present in the electrolytic anode mud. There are many methods for recovering and purifying selenium and tellurium from copper electrolysis anode mud: caustic oxidative pressure leaching, oxidative roasting and high-temperature leaching, low-temperature oxidative roasting, dilute sulfuric acid leaching, etc. The reduction of selenium and tellurium mostly adopts sulfur dioxide reduction and copper reduction. method. Due to the pre-roasting and oxidation method, the equipment is more complicated and the maintenance cost of power equipment is high. The sulfur dioxide gas is more harmful to the human body and the environment, and the recovery rate and purity of selenium and tellurium. Using H2O2 as the oxidant, oxidize selenium and tellurium in a weak acid solution, adjust the pH to separate selenium and tellurium after solid-liquid separation, and reduce...
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