本文關(guān)鍵詞： 低品位釩鈦磁鐵精礦 鐵顆粒長大 強(qiáng)化還原 磁選分離　出處：《昆明理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：釩鈦磁鐵礦是我國的重大特色戰(zhàn)略資源,遠(yuǎn)景儲量可達(dá)400億噸,是一種以鐵、釩、鈦等多種金屬共伴生的礦產(chǎn)資源,具有很高的綜合利用價(jià)值。隨著我國優(yōu)質(zhì)釩鈦資源的逐年減少,對外依存度逐年增大,加強(qiáng)超貧釩鈦磁鐵礦資源高效、清潔、綜合開發(fā)利用,對提高我國資源保障量、促進(jìn)釩鈦產(chǎn)業(yè)可持續(xù)發(fā)展具有重大意義。目前我國對釩鈦磁鐵礦的研究工作大多偏重于高品位釩鈦磁鐵礦或者高鉻型釩鈦磁鐵礦,有關(guān)超貧釩鈦磁鐵礦綜合開發(fā)和利用的研究報(bào)道較少,遼西地區(qū)的釩鈦磁鐵礦由于鐵含量低而釩鈦含量高,具有非常高的綜合利用價(jià)值,本文以遼西地區(qū)超貧釩鈦磁鐵礦選礦后得到的低品位釩鈦磁鐵精礦為原料,系統(tǒng)開展了低品位釩鈦磁鐵精礦直接還原、強(qiáng)化還原、過程強(qiáng)化、磨選分離的研究,實(shí)現(xiàn)了低品位釩鈦磁鐵精礦中鐵與釩/鈦的高效分離,取得了以下創(chuàng)新性成果:(1)系統(tǒng)研究了低品位釩鈦磁鐵精礦直接還原過程中鐵、釩、鈦的還原行為,獲得了鐵、釩、鈦的遷移規(guī)律。結(jié)果表明:通過控制C/Fe摩爾比和還原溫度,可使低品位釩鈦磁鐵精礦中的釩不被還原而隨鈦進(jìn)入釩鈦渣。獲得優(yōu)化的還原條件:C/Fe摩爾比為1.2,還原溫度1200℃,還原時(shí)間120 min。添加復(fù)合添加劑可使低品位釩鈦磁鐵精礦的金屬化率達(dá)91.3%,鐵、釩、鈦的回收率分別達(dá)到96.2%、85.4%、88.6%,使用水淬冷卻強(qiáng)化可脫去還原產(chǎn)物中39.5%的硫。(2)直接還原過程中金屬鐵顆粒長大的研究表明:提高還原溫度可以促進(jìn)直接還原過程中金屬鐵顆粒的長大,但是過高的溫度不利于鐵釩磁選分離,因此比較適宜的還原溫度為1200℃。添加鈉鹽可以破壞鐵橄欖石和鐵尖晶石的礦相結(jié)構(gòu),生成低熔點(diǎn)的物質(zhì),改善了金屬鐵相的擴(kuò)散條件,從而可以得到粒徑較粗的鐵顆粒。復(fù)合添加劑的不同的陰離子的共同作用,相比單一的鈉鹽添加劑,促進(jìn)鐵顆粒長大的效果更加明顯。(3)深入探究了磨礦細(xì)度和磁場強(qiáng)度對鐵釩鈦的回收率的影響,發(fā)現(xiàn)隨著磨礦時(shí)間的增加,粒度越來越細(xì),回收率不會隨著粒度的變小而提升,獲得最適宜的磨礦時(shí)間為30 min,粒度為14 μm,磁場強(qiáng)度為100 mT,鐵的回收率為94.67%,品位為97.31%。
[Abstract]:The major characteristics of vanadium titanium magnetite is our strategic resources, prospective reserves of up to 400 tons, is a kind of iron, vanadium, titanium and other metals were associated with the comprehensive utilization of mineral resources, has a very high value. With the development of high quality vanadium resources in China decreased year by year, the foreign dependency increases each year, to strengthen the ultra poor vanadium titanium magnetite resources efficient, clean, comprehensive development and utilization of resources, improve our security, is of great significance to promote the sustainable development of vanadium and titanium industry. At present our country of vanadium titanium magnetite mostly focuses on the research work of high grade titanomagnetite or high chromium vanadium titanium magnetite, and the related reports by ultra poor vanadium titanium magnetite comprehensive development is less. In the western area due to low levels of iron and vanadium titanium magnetite vanadium content is high, has the very high value of comprehensive utilization, in order to get western Liaoning ultra poor vanadium titanium magnetite ore. Low grade vanadium titanium magnetite concentrate as raw material, system to carry out a low grade titanomagnetite direct reduction, strengthening reduction, process intensification, grinding of separation, to achieve an efficient separation of low grade titanomagnetite in iron and vanadium / titanium, has obtained the following innovative achievements: (1) the system of low grade vanadium titanium magnetite the direct reduction process of iron ore, vanadium, titanium reduction behavior, the iron, vanadium, titanium migration. The results showed that by controlling the molar ratio of C/Fe and reduction temperature, the low grade titanomagnetite in vanadium and titanium with can't be reduced into vanadium titanium slag. Reducing conditions optimization: C/Fe molar ratio 1.2, reduction temperature of 1200 DEG C, the reduction time of 120 min. composite additive can make metal of low grade titanomagnetite rate reached 91.3%, iron, vanadium, titanium recovery rate reached 96.2%, respectively, 85.4%, 88.6%, the use of water quenching can be enhanced Remove the reduction product of 39.5% s. (2) research on direct reduction of iron in the process of growing up shows that the increase of the reduction temperature can promote the direct reduction of iron in the process of growing up, but the high temperature is not conducive to the separation of Fe-V, so it is suitable the temperature of 1200 DEG. Adding sodium salt can destroy the structure fayalite and hercynite mineral phase, producing low melting point metal material, improve the iron phase diffusion conditions, so as to obtain the coarse grain size of the iron particles. The interaction of compound additives of different anions, compared to single sodium additives, promote the grain growth effect is more obvious. (3) the in-depth study of the effect of recovery of grinding fineness and the strength of the magnetic field of Fe-V titanium ratio, with the increase of grinding time, more and more finer, the recovery rate will not improve as the size of the smaller, get the most The suitable grinding time is 30 min, the grain size is 14 mu m, the magnetic field strength is 100 mT, the iron recovery rate is 94.67%, the grade is 97.31%.

【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD95

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李建峰;張淑年;張杰;;南非Roossenekal釩鈦磁鐵礦特征淺析[J];西部探礦工程;2016年01期

2 成曦暉;徐九華;張輝;;芬蘭馬斯塔瓦納磁鐵礦-鈦鐵礦礦床地質(zhì)特征與成因[J];地質(zhì)通報(bào);2015年06期

3 趙龍勝;王麗娜;陳德勝;趙宏欣;劉亞輝;齊濤;;高鉻型釩鈦磁鐵精礦煤基直接還原-磁選分離過程中釩和鉻的行為（英文）[J];Transactions of Nonferrous Metals Society of China;2015年04期

4 文涵睿;楊曉軍;何劍;;攀西釩鈦磁鐵礦采選工藝與二次資源利用現(xiàn)狀[J];礦產(chǎn)綜合利用;2014年06期

5 張韶敏;;承德某超貧釩鈦磁鐵礦干拋尾礦回收磷的試驗(yàn)研究[J];礦冶;2013年S1期

6 劉才澤;秦建華;李明雄;張啟明;;四川攀西地區(qū)釩鈦磁鐵礦成礦元素富集過程模擬與資源潛力評價(jià)[J];吉林大學(xué)學(xué)報(bào)(地球科學(xué)版);2013年03期

7 孫紹利;陳立武;徐連勇;王臣;;承德地區(qū)超貧釩鈦磁鐵礦礦石特征[J];科協(xié)論壇(下半月);2013年04期

8 王敏;薛遜;曹志成;王靜靜;古明遠(yuǎn);;轉(zhuǎn)底爐直接還原工藝的應(yīng)用及發(fā)展趨勢[J];天津冶金;2013年01期

9 陳俊華;許建文;魯燕;唐虎;高艷東;;哀牢山群黎明超貧磁鐵礦礦床地質(zhì)特征及成因探討[J];科學(xué)技術(shù)與工程;2013年02期

10 ;Effects of Oxides Contents in Vanadium Slag on Corrosion Mechanism of MgO-C Bricks[J];Journal of Iron and Steel Research(International);2012年10期

相關(guān)會議論文 前2條

1 薛遜;鄧君;湯天宇;杜建橋;邊悟;;基于轉(zhuǎn)底爐直接還原的釩鈦磁鐵礦綜合利用技術(shù)研究[A];2007中國鋼鐵年會論文集[C];2007年

2 趙慶杰;儲滿生;王治卿;董文獻(xiàn);;非高爐煉鐵技術(shù)及在我國發(fā)展的展望[A];2008年河南省煉鐵專業(yè)委員會年會暨煉鐵學(xué)術(shù)交流會文集[C];2008年

相關(guān)博士學(xué)位論文 前4條

1 趙龍勝;高鉻型釩鈦磁鐵精礦還原提鐵—濕法治金提取鈦釩鉻新過程[D];中國科學(xué)院研究生院(過程工程研究所);2015年

2 裴素朋;含釩氧化物和復(fù)合氧化物催化劑的制備及其在甲烷和丙烷選擇氧化反應(yīng)中的應(yīng)用研究[D];復(fù)旦大學(xué);2007年

3 郭宇峰;釩鈦磁鐵礦固態(tài)還原強(qiáng)化及綜合利用研究[D];中南大學(xué);2007年

4 黃柱成;冷固結(jié)球團(tuán)直接還原技術(shù)及其應(yīng)用[D];中南大學(xué);2002年

相關(guān)碩士學(xué)位論文 前1條

1 呂亞男;釩鈦磁鐵精礦固態(tài)還原及高效利用研究[D];中南大學(xué);2009年

，

本文編號：1556130