(1. 昆明理工大學(xué) 冶金節(jié)能減排教育部工程研究中心，昆明 650093；
2. 昆明理工大學(xué) 云南省復(fù)雜有色金屬資源清潔利用國家重點實驗室(培育基地)，昆明 650093)
摘 要: 硫化焙燒法可較好地脫除錫鐵精礦中錫，且可實現(xiàn)鐵物相的預(yù)還原，有利于后續(xù)工藝中鐵資源的高效回收。以熱力學(xué)分析為基礎(chǔ)，結(jié)合化學(xué)分析和X射線衍射分析，對錫鐵精礦的硫化焙燒過程進行了研究。結(jié)果表明：無煙煤用量增加時，錫脫除率呈先增加后降低趨勢，其添加量(無煙煤與錫鐵精礦質(zhì)量比)超過10%，部分錫物相被還原成金屬錫，并與鐵結(jié)合形成硬頭，錫揮發(fā)脫除率下降；焙燒過程中鐵物相由Fe3O4轉(zhuǎn)變?yōu)镕eO，實現(xiàn)了鐵的預(yù)還原；以高硫煤對錫鐵精礦進行還原-硫化復(fù)合焙燒，在氮氣流量0.6 L/min、焙燒溫度1 273 K、焙燒時間40 min和高硫煤(含硫量3.07%)添加量(高硫煤與錫鐵精礦質(zhì)量比)10%試驗條件下，可將精礦含錫降至0.043%，該研究為高硫煤的清潔利用提供了一個新途徑。
關(guān)鍵字: 錫鐵精礦；硫化焙燒；脫錫；高硫煤
（1. Engineering Research Center of Metallurgical Energy Conservation & Emission Reduction,
Kunming University of Science and Technology, Kunming 650093, China;
2. Ministry of Education, State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China）
Abstract:Tin can be removed effectively from tin-bearing iron concentrates with sulfidation roasting, and the iron phase is pre reduced, which are beneficial for the iron recovery. Based on the thermodynamic analysis, the process of tin removal was studied. The results show that tin removal rate increases first and then deceases with the increase of anthracite addition amounts (mass ratio of anthracite and tin-bearing iron concentrates). When the addition amounts increases over 10%, metallic tin and iron generate, and they combined forming hardhead, as a result of which the tin removal rate is reduced. Fe3O4 being reduced into FeO in the roasting process, pre-reduction of iron phase is realized. The tin content is decreased to 0.043% under the conditions of N2 flow rate 0.6 L/min, roasting temperature 1 273 K, holding time 40 min, and high-sulfur coal (S content of 3.07% ) addition amount (mass ratio of high-sulfur coal and tin-bearing iron concentrates) 10%. This work supplies a new approach for the clean use of high-sulfur coal.
Key words: tin-bearing iron concentrates; sulfidation roasting; tin removal; high-sulfur coal
