(1. 昆明理工大學(xué) 冶金與能源工程學(xué)院，昆明 650093； 2. 昆明高聚科技有限公司，昆明 650106)
摘 要: 赤鐵礦法除鐵工藝因渣含鐵高，渣量小，無二次污染等特點(diǎn)備受國內(nèi)外關(guān)注。硫含量是影響赤鐵礦品質(zhì)并實(shí)現(xiàn)其資源化利用的重要因素之一。本工作研究溫度、時間、Na2SO4濃度、晶種用量、始酸濃度等因素對赤鐵礦沉鐵過程除鐵率、亞穩(wěn)態(tài)鐵物相轉(zhuǎn)變及硫吸附轉(zhuǎn)化行為的影響規(guī)律。結(jié)果表明：升高溫度、延長反應(yīng)時間、添加晶種、降低始酸濃度、控制Na2SO4濃度可有效提高除鐵率且有利于鐵礬向赤鐵礦轉(zhuǎn)化，從而顯著降低渣中硫含量，提升赤鐵礦渣品質(zhì)。在反應(yīng)溫度為180 ℃、反應(yīng)時間3 h、氧分壓0.4 MPa、晶種15 g/L、硫酸鈉濃度為0.15 mol/L的條件下，除鐵率達(dá)到96%左右，渣含鐵為65.8%，硫、鈉的含量為1.42%、0.067%，獲得了高品質(zhì)的赤鐵礦渣。
關(guān)鍵字: 赤鐵礦；鐵礬轉(zhuǎn)化；沉鐵率；吸附
（1. Kunming University of Science and Technology, Faculty of Metallurgical and Energy Engineering, Kunming 650093, China; 2. Kunming Gaoju Science and Technology Co., Ltd., Kunming 650106, China）
Abstract:Hematite process with the properties of high iron content, small residue volume and no secondary pollution has been paid great attention in the whole world. Sulfur content is one of the most important factors which affect the hematite quality and its utilization as a resource. The effects of temperature, time, Na2SO4 concentration, seed addition, initial concentration of sulfuric acid on iron removal efficiency, conversion behavior of semi-stable iron phases and adsorption of sulfur were investigated in present work. The results show that the jarosite is more likely to convert into hematite and sulfur content reduces in precipitate with increasing temperature, time and seed addition, and reducing the initial acid concentration and controlling the sodium ion concentration. The high quality hematite precipitates, which are obtained at reaction temperature of 180 ℃, retention time of 3h, oxygen partial pressure of 0.4 MPa, seed addition of 15 g/L and Na2SO4 concentration of 0.15 mol/L, contain 65.8% Fe, 1.42% S and 0.067% Na, and with iron removal efficiency of 96%.
Key words: hematite; jarosite transformation; removal efficiency of iron; adsorption
