Vanadium-titanium magnetic iron ore: This is the main type of ore rock ilmenite deposits in China. According to the beneficiation research and production practice of Panzhihua Mining Company, the ore dressing of ilmenite concentrate is in the magnetic separation process of the vanadium-titanium magnetite ore after a period of grinding (-0.4mm), a coarse, a fine, and a sweep. The magnetic tail (mine) after the magnetite concentrate (Fe 51% to 52%, TiO 212.6% to 13.4%, V2O 50.5% to 0.6%) was carried out.

Vanadium-titanium magnetite ore is densely symbiotic with Fe and Ti forms TiO2 in titanomagnetite (about 53% of total TiO2 reserves in Panxi area), due to the state of occurrence, particle size, and most of the smelting in blast furnace Factors such as the chemical reaction characteristics of reducing TiO2 into the slag are still difficult to recycle by mechanical beneficiation methods.

However, with the improvement and improvement of the smelting process and technology by the Panzhihua Iron and Steel Research Institute and the Beijing Iron and Steel Research Institute on the comprehensive recovery of iron, titanium and vanadium from titanium magnetite, the process has been basically completed and positive results have been achieved. . In addition, tests have been carried out to reduce the amount of iron powder and to recover vanadium and titanium. The process is:

Vanadium-titanium-iron concentrate-iron powder kiln

Carbon reduction - V2O5

Crushing grinding - vanadium-rich titanium material - wet separation - TiO2

Heavy magnetic separation

Ilmenite, rutile placer: This is the main type of ore China's current production of ilmenite and rutile concentrate. According to the production practice of four state-owned titanium (sand) mines of Hainan Zhongxing Fine Ceramics Micro Powder Factory and Hainan Metallurgical Industry Corporation, namely Shasha, Nangang, Qingyi (pre-shop) and Wuchang (Baoding), its ilmenite, The mining, ore dressing process of rutile, zircon and monazite sand mines and the technical indicators of various concentrates are shown in Figure 3.5.10. The mining recovery rate is >95%, the depletion rate is <5%, and the total recovery rate of mineral processing is 80%-85%.

In order to improve the utilization rate and economic benefits of resources, reduce the backlog of mines and tailings, and pollution to the environment, the Guangzhou Institute of Nonferrous Metals has studied the occurrence of titanium and the comprehensive recovery methods of the difficult minerals in Hainan Island. (Proceedings of the Third National Conference on Comprehensive Utilization of Mineral Resources, 1990). The research and experiments show that:

1 Titanium is mainly present in the titanium-iron ore series formed by the isomorphous substitution of Ti4+ and Fe2+; ilmenite (52%-54% containing TiO2) and iron-rich ilmenite (including TiO246%) The proportion accounted for 66.2%, followed by titanium-rich ilmenite (including TiO256% ~ 58%) accounted for 19.2%, titanium hematite (including TiO 210.7% ~ 19.5%) accounted for 14.6%. In addition, titanium is also present in small amounts in rutile, anatase, whitite and vermiculite.

â‘¡ hard metal selected mineral ilmenite, zircon, monazite, rutile, anatase or the like mixed minerals, mineral grain size 0.2 ~ 0.08mm (genus optional particle size); using diiodomethane media as "ups and downs" beneficiation, gravity <3.3 of the non-useable minerals have an uplift rate of 19.76%, and the useful heavy minerals with a specific gravity of >3.3 have a sinking yield of 73.5%.

3 In the heavy minerals that sink, in addition to the main ilmenite, it can comprehensively recover zircon, monazite, titanium-rich ilmenite and rutile; its effective beneficiation process is two: one is the use of useful heavy minerals by electromagnetic selection The field strength 6000Oe sorted out the magnetic product (TiO243%) which accounts for 88.1% of the ilmenite mineral content, and then oxidized and roasted at 800 °C for 10 minutes, and finally the field strength 650Oe weak magnetic separation, TiO250% can be obtained in the magnetic separation product. ~51% of ilmenite concentrate products; the second is useful heavy minerals (ilmenite concentrate, containing TiO243%~46%) by electro-election (2.1kV, 120r/min), available in conductor products TiO251% to 53% of ilmenite concentrate products.

4 In the tailings with a field strength of 8000-12000 Oe magnetic separation, flotation can be used to obtain a qualified monazite concentrate; then, in the non-electromagnetic heavy mineral tailings with a field strength >20000 Oe magnetic separation, Electrically selected to obtain a qualified zircon concentrate in a non-conducting product and a qualified rutile concentrate in a conductive product.

More than 90% of titanium ore resources at home and abroad are used to produce titanium white and titanium white production processes, mainly advanced chlorination, hydrochloric acid and traditional sulfuric acid.

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