High Calcium And Magnesium Ilmenite Preparation Of The New Technology Of High-quality Ti-rich Material

Titanium is the third largest metal only followed with iron and aluminium in the world. Because of a fine performance, it is used as a structural materials, functional materials and important biological engineering materials, which are widely used in aerospace, missiles, ships, chemical and food machinery, medical equipment and other industrial fields. Advanced titanium industry has become an important indicator of comprehensive national strength. Titanium resources from West Pan are very rich, mainly in the form of vanadium titanium magnetite, and vanadium titanium magnetite reserves were proven to 9.66 billion tons, ranking first in the world.Traditional production methods of rich titanium materials are mainly refer to Electric Smelting Law, Reduction Rust Law, Choice Chlorination Law and Acid Leaching Law. Main applications currently in the industry had Electric Smelting Law, Reduction Rust Law, and Acid Leaching Law. The four methods have limitations because the impurities content of calcium and magnesium of ilmenite from the region of West Pan are rich.Aiming at the feature of ilmenite with high calcium and magnesium from the region of West Pan, integrated the process of preparation for rich titanium materials and the advantages of microwave irradiation heating, a new technology flow of preparation for high quality rich titanium materials by leaching under microwave irradiation in the acid solution was investigated in this paper. This forward process included reducing by microwave irradiation, grinding choose and separating Fe and Ti. The materials could be raw materials of sponge titanium or titanic powder fabricated by boiling chlorination.Experiments results of preparing the primary titanium-rich material from ilmenite indicated that selecting additive C, the appropriate technological parameters of microwave reduction included reduction temperature of 1100℃ 1150°C, reduction time of 1.5h, content of additive 5%, milling time of 20 min, granularity of product from 124 um to 175 um, magnetic separation currents identified as 4.5A. Under the above condition, the content of TiO₂ of primary richtitanium product was 65.88%.Microwave heating experiments performed by hydrochloric direct leaching and addition of modified agents experiments showed that addition of modified agents were favor of the leaching of impurities, such as calcium and magnesium. Microwave radiation heating hydrochloric direct leaching conditions for the optimization process were followed: the concentration of 10% hydrochloric acid (quality%), liquor-to-solid ratios of 12:1 (V:W), producing temperature at 160 degrees, designed to 120min;primary rich titanium granularity size selected from 48 um to 74 um. The results of experiments under the best conditions were gained as follow: TiO2 grade of 85.10%, TFe content of 3.96%, CaO content of 2.51%, MgO content of 1.84%. The rate of return for Titanium was as high as 91.90%.The result of orthogonal experiment was obtained as follows: leaching temperature 200°C, the concentration of hydrochloric acid 25%, the content of modifying agent B 10%. The major cause of the effect on the content of TiO2 was leaching temperature and secondly, the concentration of hydrochloric acid, thirdly the content of modified agent B. The quality of TiO2 97.68%, CaO+MgO 0.89%, the content of TFe 0.1% and the content of MnO 0.16% were obtained under the above leaching conditions. The rate of return for Titanium was as high as 92.44%.From the results of this research it may be known that the above technical programme of preparation for high quality rich titanium materials was feasible, and 97.68% of TiC>2 grade could be obtained through the programme. At the same time the technical route solved that high calcium and magnesium impurities impacted on concentrating rich titanium material from the region of West Pan, and provided a technical programme to be worth further carrying on the expanded experiment.