Purpose of titanium iron ore beneficiation of ilmenite ore is pre-enrichment to increase the ilmenite concentrate grade of TiO 2, to reduce the cost of smelting. The mineral processing technology of the original ilmenite has been determined by the scientific and technological research for many years. The selection process is determined to be re-election-electrical selection for coarse-grained grades, and strong magnetic-flotation process for fine-grained grades. The flotation collectors used are mainly MOS. As the mining progresses to the deep, the ore tends to be lean, fine and miscellaneous. In order to ensure the grade of the iron concentrate, the magnetic separation tailings need to be finely ground. A large amount of -0.045mm grain-level material is directly discarded as slime, resulting in low recovery of titanium and waste of resources. Therefore, for fine-grained ilmenite, flotation is more and more manifested in its superiority, and people are more devoted to the research of ilmenite full flotation process. The key to ilmenite flotation is to develop a new and efficient ilmenite collector, optimize the process and reduce production costs. In recent years, ilmenite flotation research mainly focuses on the following two aspects: First, the development of selective and more active ilmenite collectors, and also through the combination of collectors to enhance the capture performance of the agent; On the other hand, it is to improve the existing flotation process, using selective flocculation flotation, carrier flotation, agglomeration flotation and microbubble flotation, etc., to strengthen the selection of fine-grained iron ore. I. Research status of ilmenite flotation reagent The medicaments used in the flotation of ilmenite mainly include collectors, conditioners and foaming agents. In the 1940s and 1950s, people began research on ilmenite flotation. Commonly used collectors for ilmenite flotation are fatty acids such as oxidized paraffin soap, pulp waste and tal oil, hydroxamic acid and its salts, organic phosphonic acid and swollen acid. At this stage, the ore tends to be lean and refined, and the use of a single agent is difficult to achieve the effects of both activity and selectivity, and cannot meet the needs of industrial development. Therefore, the mixed use of existing agents and the synthesis of new agents are the main research directions of ilmenite flotation. Mixed drugs can achieve better technical indicators and economic benefits than single drugs. The synergistic effect of the agents indicates that two or more agents are used in combination in an optimal ratio, and the effect is often superior to any of the agents. Hu Yongping mixed the alkyl bisphosphonic acid with salicyl hydroxamic acid and floated the artificial mixed minerals, which not only improved the selection index, but also reduced the total consumption of the medicament. When the ratio of the two is 34:15, the salinized water glass is used as the inhibitor, and the pH value is about 6.3. After 1 rough selection and 2 times of selection, the TiO 2 grade can be obtained as 48.32%, and the recovery rate is 75.71%. Titanium concentrate. Zhu Jianguang mixed the three kinds of collectors and synthesized the MOS collector according to the best ratio. It was adopted by the Panzhihua Titanium Company. In the industrial test, a titanium concentrate having a TiO 2 grade of 47.31% and a recovery of 59.29% can be obtained from a feedstock having a TiO 2 content of 22.52%. After 1 year of production practice, MOS is used as a collector in the field. The grade of concentrate TiO 2 is 47% to 48%, and the recovery rate is 61.6%. Practice has proved that MOS is an effective collector for ilmenite, but MOS collector also has some defects, such as large dosage, it needs to be used together with a variety of modifiers. In response to the shortcomings of MOS, Zhu Jianguang developed a new collector MOH based on MOS collector and conducted industrial tests. The results show that: only using sulfuric acid as the adjusting agent, the grade of titanium concentrate TiO 2 is 47.51%, the recovery rate is 77.66%, which is 16.06 percentage points higher than the recovery rate of MOS. The combination of a combination of a collector and a non-polar hydrocarbon oil compensates for the deficiencies of the single agent. The hydrocarbon oil covers the surface chelates formed on the mineral surface to form a hydrophobic multi-molecular layer to improve the performance of the collector. Sun Zonghua et al used a mixture of non-polar oil and benzyl sulphonic acid as a collector, and used Pan-flocculation ilmenite by hydrophobic flocculation flotation, using sulfuric acid as a regulator, sodium fluorosilicate as an inhibitor, and ethyl ether alcohol. As a foaming agent, a titanium concentrate having a TiO 2 grade of 45.79% and a recovery rate of 50.52% was obtained from a feedstock having a TiO 2 content of 9.84%. Xu Wei should use oil and coal flotation ilmenite styrene phosphoric acid, can play kerosene was found to accelerate the flotation rate, limit the expansion of flotation size, the amount of styrene reduction, improve the selectivity of the flotation process and improving the foam properties like good results . In the study of combined collectors, cation collector-anion collector, anion collector-anion collector, non-polar collector-other collectors, collector-foaming agent are often used. Mixtures of collectors, flocculants, etc. to compensate for the lack of activity and selectivity of the mono-agent. In the aspect of new drug synthesis, research on the effective group of the agent and its flotation mechanism, and design and selection of the drug molecule will contribute to the synthesis of the new high-efficiency collector. Seeing the molecular design of Baixi's introduction of the principle of pharmaceutical design into the flotation agent, Wang Dianzuo proposed the structural performance criteria of various pharmaceuticals, and used quantitative methods to design the drug molecules. These theories provide the basis for the research and development of pharmaceuticals. In the research of fine-grained ilmenite collectors, the development of multi-functional agents and the optimization of pharmaceuticals are one direction for future development. 2. Research status of ilmenite flotation process With the deepening of mining, the inlay size of minerals in the ore is finer, and the original production process cannot adapt to the current ore properties. Therefore, the improvement and optimization of the flotation process is an effective way to float fine-grained ilmenite. . Zhu Yangge et al. studied the self-supporting flotation of -20μm fine-grained ilmenite. The results show that the interaction between the coarse and fine grain carriers of ilmenite flotation is significantly affected by the relative content of the two, when the ratio of coarse carrier is above 50%. At the time, the effect from the carrier is better. The experiment was carried out with the actual ore of Panzhihua ilmenite as a test sample. Compared with the flotation process of fine-grained minerals, the recovery rate of -20μm granular ilmenite increased from 52.56% to 61.96%. For the first time, Fan Xianfeng used microwave energy as a pretreatment technique for ilmenite ore dressing, and studied the application of microwave energy in grinding, magnetic separation and flotation. Microwave selectively heats each mineral in ilmenite, causing strong stress inside the ore, promoting the formation of fine cracks between the phases, and enhancing the intergranular dissociation of the mineral. After the ilmenite has a power of 2600 W and microwave irradiation at a frequency of 2.45 GHz for 60 s, its relative grinding work index is reduced by 80%. At the same time, the ilmenite recovery rate and magnetic separation concentrate grade increase with the applied microwave power level and irradiation time. By microwave irradiation, the ferrous ions on the surface of ilmenite are rapidly oxidized to ferric ions, which enhances the adsorption of oleate ions on the surface. The results of two selective experiments on open-circuit flotation showed that the recovery of TiO 2 increased from 39.8% to 74.8% and the grade increased from 26.2% to 29.9% compared with the conventional method. Qi Wenqing et al. based on the research of process mineralogy of a ilmenite in Shandong Province, based on the complex composition of ore minerals and fine grain size of minerals, the ore was compared with various experimental schemes, and finally the stage grinding was determined. In the phase selection magnetic separation-flotation combined process, an iron concentrate with an iron grade of 66.42% and a titanium concentrate with a TiO 2 grade of 45.28% were obtained from a ore with an iron content of 19.48% and a TiO 2 content of 9.40%. Steam Kinetic Energy Mill,Dry Nano Milling Equipment,Ultrafine Wollastonite Powder Mill,Steam Kinetic Energy Grinding Machine Mianyang Liuneng Powder Equipment Co., Ltd , https://www.lnpepowder.com
Current status of research on ilmenite flotation