(1. 中南大学 资源加工与生物工程学院，长沙 410083；
2. 贵研铂业股份有限公司 稀贵金属综合利用新技术国家重点实验室，昆明 650106)
摘 要: 开展了高钙镁型钛渣通过添加Na2CO3焙烧进行矿相重构制取人造金红石的研究。采用XRD、SEM等技术对焙烧产物微观结构、物相组成和浸出产物物相组成进行表征。结果表明，在Na2CO3与钛渣质量比为3:7、焙烧温度为900 ℃、焙烧时间为2 h的条件下，所得焙烧产物经酸浸、煅烧后，获得TiO2品位为92.23%、回收率为92%、CaO+MgO含量(质量分数)为0.78%的人造金红石。该制备过程的机理主要在于高钙镁型钛渣添加Na2CO3焙烧可使其中的主要杂质转变为易选择性溶出的铁酸钠、Na-Fe-Ti-O系和Na-Mg-Ti-O系新矿相；通过酸浸，焙烧产物中大部分杂质被选择性溶出，钛组分转变成金红石型和锐钛型TiO2，实现了高品位人造金红石的制取。
关键字: 钛渣；物相重构；人造金红石
（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
