中國有色金屬學(xué)報
ZHONGGUO YOUSEJINSHU XUEBAO
| 第18卷 第11期 總第116期 2008年11月 |
[PDF全文下載]
文章編號：1004-0609(2008)11-2087-07
高鋁褐鐵礦鋁鐵分離新工藝及其機理
李光輝，周太華，劉牡丹，姜 濤，范曉慧
(中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083)
摘 要: 系統(tǒng)地研究高鋁褐鐵礦工藝礦物學(xué)特性，開發(fā)鈉鹽焙燒—溶出鋁鐵分離新工藝，運用XRD和SEM等分析鋁鐵的分離機理。結(jié)果表明：鋁主要呈微細(xì)顆粒嵌布于褐鐵礦中或以類質(zhì)同象形式存在于針鐵礦物中，采用常規(guī)的磁選、浮選和磁化焙燒等工藝不能有效地分離鋁鐵；采用鈉鹽焙燒—溶出鋁鐵分離新工藝，當(dāng)焙燒溫度為 1 000 ℃，焙燒時間為10 min，Na2CO3質(zhì)量分?jǐn)?shù)為14.0%時，可制備全鐵品位63.21%，Al2O3含量為2.13%的鐵精礦，有效實現(xiàn)鋁鐵分離；原礦中的鋁經(jīng)鈉鹽焙燒后轉(zhuǎn)變?yōu)殇X硅酸鈉、鋁酸鈉、α-Al2O3；鋁酸鈉、鋁硅酸鈉經(jīng)溶出后被脫除，殘留在鐵精礦中的鋁主要為呈微細(xì)粒嵌布在鐵礦物中的α-Al2O3。
關(guān)鍵字: 高鋁褐鐵礦；焙燒；溶出；脫鋁
Novel process and mechanisms of aluminum-iron separation of high-aluminum limonite ore
LI Guang-hui, ZHOU Tai-hua, LIU Mu-dan, JIANG Tao, FAN Xiao-hui
（School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:A novel process of removal aluminum from the high aluminum limonite ore by sodium-salt-added roasting-leaching was developed based on the investigation on properties of mineralogy. And the mechanism of aluminum-iron separation was studied by XRD and SEM. The results show that aluminum minerals are mainly dispersed among the iron ore as a manner of superfine grains or scattered into the iron minerals in isomorphism, thus magnetic separation, floatation and magnetized roasting are unable to remove aluminum from the ore effectively. Aluminum can be removed from the ore by sodium-salt-added roasting followed leaching processing, and the iron concentrate with the iron grade of 63.21% and Al2O3 content of 2.13% can be obtained under the conditions of roasting temperature of 1 000 ℃, roasting time of 15 min and mass fraction of Na2CO3 of 14.0%. Aluminum in the ore is transformed to sodium aluminate, sodium aluminosilicate and α-Al2O3, among which sodium aluminate and sodium aluminosilicate can be leached by water and acid solution in turn, while α-Al2O3 remains in iron concentrate as a manner of superfine grains.
Key words: high-aluminum limonite; roasting; leaching; removing aluminum
