目前,制取高纯硒的方法有蒸镏法,亚硫酸钠加成法,硒化氢热分解法,升华二氧化硒法和离子交换法等。国内生产高纯硒多采用升华二氧化硒,中和沉淀氨或二氧化硫还原法,其缺点是含砷量较高。国外己有离子交换法制取高纯硒的报道,但国内尚未见到,本实验是用硝酸氧化粗硒,用离子交换法提纯亚硒酸溶液,水合联氨还原硒(Ⅳ)制取高纯单质硒。 At present, the preparation of high-purity selenium methods are steam law, sodium sulfite addition method, thermal decomposition of hydrogen selenide, sublimation of selenium dioxide and ion exchange method. Domestic production of high purity selenium selenium use more sublimation, precipitation and ammonia or sulfur dioxide reduction method, the disadvantage is the higher arsenic. Abroad, ion exchange method has been made of high purity selenium reports, but not yet seen in China, this experiment is the use of nitric acid crude selenium, ion exchange purification of selenite solution, Hydrazine hydrazine reduction of selenium (Ⅳ) Preparation of high purity Elemental selenium.