塩酸酸洗廃液の噴霧焙焼により副生する酸化第二鉄

概要

論文の詳細を見る
Some physical and chemical properties of ferric oxide (α-Fe_2O_3, hematite) produced by spray roasting of HCl pickling liquor were examined in order to elucidate following subjects. (1) The effect of FeCl_2 concentration in sprayed liquor and roasting temperature on mean particle size of fine hematite. (2) Forming process of hematite granules (agglomerated particles), thermal decomposition process from FeCl_2 to iron oxide and dechlorination process of hematite. The results are summarized as follows : (1) The mean particle size of hematite is almost determined by FeCl_2 concentration and roasting temperature. (2) The thermal decomposition of FeCl_2 is an exothermal reaction. When the roasting temperature is below the melting point of FeCl_2, the reaction product mainly consists of α-Fe_2O_3. At higher temperatures, the Fe_3O_4 content increases. (3) The weight change of hematite by firing in air coincides with the sum of the decrement of H_2O and chlorides through desorption and decomposition and the increment of combined oxygen through oxidation of Fe(II) to Fe(III). The desorption of H_2O and HCl on hematite is completed at about 250℃. Other chlorides in hematite are recognized as FeCl_2 and FeCl_3.
社団法人日本鉄鋼協会の論文
1976-07-01