(1. 中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083；
2. 貴研鉑業(yè)股份有限公司 稀貴金屬綜合利用新技術(shù)國家重點(diǎn)實(shí)驗室，昆明 650106)
摘 要: 開展了高鈣鎂型鈦渣通過添加Na2CO3焙燒進(jìn)行礦相重構(gòu)制取人造金紅石的研究。采用XRD、SEM等技術(shù)對焙燒產(chǎn)物微觀結(jié)構(gòu)、物相組成和浸出產(chǎn)物物相組成進(jìn)行表征。結(jié)果表明，在Na2CO3與鈦渣質(zhì)量比為3:7、焙燒溫度為900 ℃、焙燒時間為2 h的條件下，所得焙燒產(chǎn)物經(jīng)酸浸、煅燒后，獲得TiO2品位為92.23%、回收率為92%、CaO+MgO含量(質(zhì)量分?jǐn)?shù))為0.78%的人造金紅石。該制備過程的機(jī)理主要在于高鈣鎂型鈦渣添加Na2CO3焙燒可使其中的主要雜質(zhì)轉(zhuǎn)變?yōu)橐走x擇性溶出的鐵酸鈉、Na-Fe-Ti-O系和Na-Mg-Ti-O系新礦相；通過酸浸，焙燒產(chǎn)物中大部分雜質(zhì)被選擇性溶出，鈦組分轉(zhuǎn)變成金紅石型和銳鈦型TiO2，實(shí)現(xiàn)了高品位人造金紅石的制取。
關(guān)鍵字: 鈦渣；物相重構(gòu)；人造金紅石
（1. School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,
Sino-platinum Metals Co., Ltd., Kunming 650106, China）
Abstract:Study on the production of synthetic rutile from high Ca and Mg type titanium slag by adding Na2CO3 roasting for mineral phase reconstruction was carried out. The microstructure and mineral phase composition of the roasted product and leached product were characterized by XRD and SEM. The results show that a synthetic rutile with TiO2 grade of 92.23%, recovery of about 92% and CaO+MgO content (mass fration) of 0.78% is obtained by leaching and calcining the roasted product under the conditions of mass ratio of Na2CO3 to titanium slag of 3:7, roasting temperature of 900 ℃ and roasting time of 2 h. The mechanism of the preparation process is that after the titanium slag adding Na2CO3 being roasted, the impurities associated with titanium slag convert to easily selective soluble sodium titanate, sodium ferrite, Na-Fe-Ti-O and Na-Mg-Ti-O system minerals phase by roasting with Na2CO3. The roasted product is subjected to acid leaching, the impurities are selectively leached out, the titanium component converts into rutile and anatase type TiO2, which realizes the production of high grade synthetic rutile.
Key words: titanium slag; mineral phase reconstruction; synthetic rutile
