中文摘要：

含钛高炉渣中富钛相因其分散在炉渣的多种矿相中且晶粒细小，常规选矿分离技术难以将富钛相从含钛高炉渣中有效地分离出来。将超重力场引入到CaO—TiO2．SiO2-A1203-MgO熔体，为了在冷却过程中钙钛矿相定向富集，重点探讨了熔体中钙钛矿相在不同重力系数及冷却速率下富集规律。研究结果表明当CaO—TiO2-SiO2-Al203-MgO熔体以口=5K·min^-1冷却速率在重力系数G1〉750进行富集后，试样沿着超重力方向出现明显分层且试样中钙钛矿相沿着超重力方向呈现粒度梯度分布。对分层的试样纵剖后进行光学显微镜观察，熔体中的钙钛矿相在超重力作用下全部富集到试样的中下部区域，而在试样上部区域没有发现钙钛矿晶粒。对本实验条件下熔体中钙钛矿相运动机制进行分析，熔体中钙钛矿晶粒的运动速度与晶粒直径的平方成正比，熔体中大粒径的钙钛矿晶粒比小颗粒晶体在相同的重力系数下具有更大的运动速度，最终富集到试样的底部，而细小的钙钛矿晶粒则富集到式样的中部。假设熔体中的钛以TiO2形式存在，当CaO—TiO2-SiO2-Al2O3-MgO熔体以v=5K·min^-1冷却速率在重力系数G=750时进行富集后，富集到试样中下部精矿中的TiO2质量分数可达34．8％，而尾矿中TiO2质量分数仅为11．28％。考虑到常重力试样中TiO2质量分数为22．34％，通过离心富集后，精矿中钛的回收率高达77．13％。

英文摘要：

Titanium-rich phases in titanium bearing blast furnace slag could hardly be recovered by traditional separating technique for the dispersed distribution of titanium-rich phases in various mineral phases and very fine grains. Super gravity field was introduced to enrich perovskite phase from CaO-TiO2-SiO2-Al2O3-MgO melt during cooling process to study the influence of the gravity coefficient and cooling rate on the enrichment law of perovskite phase. With the gravity coefficient of G〉750 and the cooling rate of v = 5 K, min-1, the sample obtained by centrifugal enrichment during cooling process appeared obvious layer distribution, and perovskite phase presented gradient size distribution along the super gravity. The layered sample was central cut and characterized by metallographic mi- croscopy, and it was hardly to find any perovskite particles in the upper area of the sample and the perovskite phase was gathered at the bottom and middle areas of the sample. The mechanism of moving speed of perovskite particles in super gravity field was also dis- cussed, and the conclusion indicated that the moving speed of perovskite particles was proportional to the square of the perovskite parti- cle size. As a result, large size perovskite particles moved faster at the same gravity coefficient than the small ones and accumulated atthe bottom of the sample, while the small ones accumulated in the middle area of the sample. Under the hypothesis that the titanium existed in the slag in terms of TiO2 , with the gravity coefficient of G = 750 and the cooling rate of v = 5 K＇min - 1, the mass fraction of TiO2 in the concentrate was up to 34.8%, while that of the tailing was just I1.28%. Considering that the mass fraction of TiO2 was 22.34% in the parallel sample obtained by normal gravity, the recovery ratio of Ti in the concentrate was up to 77.13% by centrifugal enrichment.