一氧化镁垫底瓷坩埚中混合熔剂测铁矿中全铁我们学习武钢的熔矿方法在磁铁矿、磁黄铁矿等各种类型铁矿中测定铁,证明此法熔矿完全、快速.试剂1)混合熔剂:Na_2CO_3 10克,H_2C_2O_4克,KNO_30.75克在105～110℃烘干,研细、混匀。2)氧化镁垫底坩埚:将粉末状MgO装满干50毫升瓷坩埚中,置高温炉中灼烧数分钟后使用。手续:称矿样0.2克于小块定量滤纸上,加混合熔剂0.5克,混匀,包成小包,放在氧化镁垫底瓷坩埚的中部,然后置于850～900℃的高温炉中灼烧3～5分钟。冷却。将熔盐移至250毫升烧杯中,加氟化钠溶液(5%)10毫升,盐酸15～20毫升,低温加热溶解,以下按常法测定铁。 Magnesium oxide bottom porcelain crucible Mixed flux Measured iron in the whole iron We learn the melting of WISCO method Magnetite, pyrrhotite and other types of iron in the determination of iron, to prove that this method of melting ore completely and quickly. Reagent 1) mixed flux: Na 2 CO 3 10 grams, H 2 C 2 O 4 grams, KNO_ 30.75 grams at 105 ~ 110 ℃ drying, fine grinding, mixing. 2) magnesia bottom crucible: The powdered MgO filled dry 50 ml porcelain crucible, set the high temperature furnace for a few minutes after burning use. Procedures: Weigh 0.2 g of ore sample on a small piece of quantitative filter paper, add 0.5 g of mixed flux, mix well, wrap into small parcels and place in the middle of a porcelain crucible bottom of magnesia and then burn in a high temperature furnace at 850-900 ° C 3 to 5 minutes. cool down. The molten salt was transferred to a 250 ml beaker, plus sodium fluoride solution (5%) 10 ml, hydrochloric acid 15 to 20 ml, heated to dissolve at low temperatures, the following determination of iron by conventional methods.