294 results about "Titanomagnetite" patented technology

The invention discloses a beneficiating method for ilmenite, relating to a method for preparing titanium concentrate and iron concentrate by beneficiating crude ilmenite. The method is characterized in that: a beneficiating process of the method orderly comprises the following steps of: (1) grinding the crude ilmenite; (2) performing alkaline leaching pretreatment under the conditions of heating, oxygenating and pressurizing; (3) filtering pulp which is subjected to the alkaline leaching pretreatment; (4) washing filter residue and grinding; and (5) performing magnetic separation to obtain the titanium concentrate and the iron concentrate. In the method provided by the invention, the characteristic of iron and titanium compact symbiosis and the isomorphism occurrence characteristic of vanadium are damaged from the source of vanadium titano-magnetite by adopting the pretreatment process, so that mineral transformation of the vanadium titano-magnetite is realized, dissociation on lattice layers of titanium and iron is realized, high-quality iron concentrate and titanium concentrate with lower iron content are obtained through grinding and the magnetic separation process, an alkaline medium used in the pretreatment can be recycled, and the process has a small influence on environment and a bright application prospect.

The invention discloses a high-pressure roller milling-preselection processing method for vanadic titanomagnetite. The raw ore is subjected to coarse crushing, secondary crushing, fine crushing and high-pressure roller milling superfine crushing, an open circuit crushing, scrap circulation crushing or fully-closed circuit crushing method is adopted, and low-intensity magnetism and high-intensity magnetism preselection is performed. The method disclosed by the invention reduces the energy consumption of crushing and ore milling and improves the ore selection efficiency in comparison with the conventional process; and the low-intensity magnetism and high-intensity magnetism preselection can separately select the main target ores-titanomagnetite and ilmenite in the vanadic titanomagnetite with higher pertinence, and the ore selection flow is simpler. By adopting a high-pressure roller mill as the superfine crushing apparatus after fine crushing, the particle size of the final crushed product can be reduced, and meanwhile, the preselection tailing discarding before milling is realized, the milling grade is improved and the energy consumption of ore milling is reduced. Compared with the traditional process, the particle size of the product is small, the equipment operation rate is high, and the unit crushing energy consumption is low. Meanwhile, the superfine crushed product can besubjected to preselection tailing discarding so as to improve the milling grade, reduce the energy consumption of ore milling, lighten the burden on subsequent selection process and improve the production efficiency.

This invention discloses a method for producing Ti-rich V-Ti oxidized pellets by chain grate and rotary kiln. The method comprises: mixing vanadic titanomagnetite concentrate with common magnetite concentrate at a weight ratio of 7:3, adding 2.0 wt. % of bentonite, palletizing to obtain 8-16 mm pellets by a disc pelletizer, drying (50-350 deg.C) and pre-heating (500-1000 deg.C) by a chain grate for 12 min, sending dried pellets into a rotary kiln, torrefying at 1150-1300 deg.C and 1.0 r/min for 30-35 min, and cooling torrefied pellets. The obtained Ti-rich V-Ti oxidized pellets have compression strength higher than 1800 N, and TiO2 content of 7.0%, thus can meet the requirement of blast furnace smelting.

The invention relates to a method for selecting and smelting titanium from vanadium titanomagnetite at low temperature, belonging to the technical field of metallurgy. The method comprises the following steps: 1) roasting at the low temperature of 500-1100 DEG C; 2) adding a solid reductant to the roasted product, carrying out reduction smelting at 1100-1300 DEG C, and separating slag and iron torespectively obtain molten iron and titanium slag; carrying out magnetic separation on the titanium slag to remove impurities, thereby obtaining the titanium-rich material; and 4) adding required metal oxide concentrate into a direct-current arc furnace, and directly alloying the molten iron to obtain alloy steel. The smelting method provided by the invention is a brand new smelting method, and changes the existing iron ore selection into titanium ore selection; the pellet is molten and reduced by roasting at low temperature, and the separated molten iron facilitates the addition of ores withdeficient metal elements so as to directly smelt the alloy steel; the titanium slag is subjected to magnetic separation to obtain the titanium-rich material, and the titanium-rich material is furthersmelted to obtain the titanium alloy or titanium metal; and the smelting slag can be used as the raw material for smelting rare earth metals so as to sufficiently and respectively utilize the elements in the ores in one step.

The invention provides a process of separating iron and titanium in seaside titanomagnetite via direct reduction roasting by using coal. According to the process, seaside titanomagnetite is employed as a raw material, a reducing agent, a binder, and an additive are added for briquetting, and then a selective direct reduction roasting - magnetic separation method is employed for respectively recovering iron and titanium. The process of the invention is simpler compared with other methods, wherein cost-effective coal is directly used as the reducing agent, additives added in the process is a mixture of sodium carbonate and sodium borate, and by adding the reducing agent and the additive, and controlling roasting temperature and time, selective reduction of iron and separation of iron and titanium can be achieved, ensuring the grade and recovery rate of direct reduced iron while reducing the titanium content in the direct reduced iron. The finally obtained direct reduction iron powder has a grade above 93%, the recovery rate of iron is generally greater than 85%, the titanium dioxide content is less than 0.5%, while the titanium dioxide content in obtained high titanium magnetic separation tailings is higher than 20%, and the recovery rate of titanium is greater than 90%.

The invention discloses a mineral processing technology for comprehensively recycling iron phosphorus from low-grade high phosphorus vanadium titanium magnetite. The low-grade high phosphorus vanadium titanium magnetite is subjected to stage grinding and low intensity magnetic separation processes to obtain iron ore concentrate and magnetic separation tailings; the magnetic separation tailings uses low temperature flotation to recycle phosphorus after concentration, wherein the low temperature flotation is as follow: adding a slurry pH adjusting agent, an inhibitor and a collecting agent to the slurry of magnetic separation tailings, adjusting the pH of the slurry to 9-10, and performing flotation under 15-20 DEG C. The technology provided by the invention puts forward a mineral processing technology for comprehensively recycling iron phosphorus aiming at the low-grade high phosphorus vanadium titanium magnetite, which firstly adopts the low intensity magnetic separation method to recycle iron from ores and then adopts the low temperature flotation method to recycle phosphorus from tailings, thus realizing efficient utilization of such kind of mineral resources and increasing the economic benefits of concentrators. The low temperature flotation of the technology can reduce the subsequent costs of processing phosphate ores, improve the benefit of the comprehensive utilization of resources, reduce the production cost and achieve low cost and efficient recycling of phosphorus.

This invention provides a glass ceramic produced by debris of magnetite that contains titanium. it takes titanium-containing debris as the main raw material, plus quartz sand that SiO2 purity greater than 96% and content of 18% ~ 30%; With further increase feldspar that content of 2% to 5% as additives; the weight percentage of above glass ceramic composition: SiO2: 55 ~ 65, Al2O3: 4 to 10, CaO: 10 ~ 20, MgO: 3-7, TiO2: 4 to 7, Fe2O3: 4.0 ~ 9.5, ZrO2: 0 ~ 1.5 , K2O - Na2O: 4 to 9. This invention can comprehensive utilize of titanium containing vanadium and titanium magnetite debris, can effectively solve the problem of environmental and safety issues caused by the long-term accumulation of debris, and reduce production costs.

The invention discloses a method for recovering ilmenite from dense difficultly to dissociate vanadium titano-magnetite. According to the method, by ways of two-stage ore grinding, two-stage magnetic separation, and demagnetizing after one-stage magnetic separation, the fineness and proportion of ores in each step are controlled, so that the wastage of dressing devices can be reduced, the service lives of devices can be prolonged, and the investment of dressing plants can be saved; on the premise that iron ore concentrates are required to be subjected to fine grinding, through staged ore grinding, magnetic separation and demagnetizing, a problem that the finenesses of recovered iron and titanium have less possibility of being concurrently considered is solved, the recovery rates of iron and titanium are improved, and considerable economic benefits are created for mining enterprises; finally, according to the method, in the process of ilmenite recovery, the requirements of magnetic separation and flotation on the particle size of ores are avoided, and multiple devices are directly adopted for gravity concentration, so that an effect of environmental friendliness, cleanness and no pollution is achieved in the process of production, and a foundation is laid for the building of green mines.

The invention relates to the technical field of mineral concentration, and especially relates to a titanium concentration method and device for vanadium titano-magnetite. The titanium concentration method comprises that one-stage iron concentration tailings of the vanadium titano-magnetite is subjected to primary slag separation treatment, primary enriching and dehydration and first classification, to be divided into one-stage iron concentration tailings coarse materials and one-stage iron concentration tailings fine materials; two-stage iron concentration tailings of the vanadium titano-magnetite is subjected to secondary slag separation treatment, secondary enriching and dehydration and secondary classification, to be divided into two-stage iron concentration tailings coarse materials and two-stage iron concentration tailings fine materials; the one-stage iron concentration tailings coarse materials and the two-stage iron concentration tailings coarse materials are combined to form coarse-fraction materials, and the one-stage iron concentration tailings fine materials and the two-stage iron concentration tailings fine materials are combined to form fine-fraction materials; the coarse-fraction materials are subjected to separation, to obtain coarse titanium concentrate; and the fine-fraction materials are subjected to separation, to obtain fine titanium concentrate. The method and device can decrease the enriching amount of tailings, reduce the energy consumption of titanium concentration, and improve the titanium recovery rate.

The invention relates to a method for reinforcing the sintering of iron ores (vanadic titanomagnetite, specularite, secondary iron-containing resources and the like) difficult to pelletize by biomass fuel. By applying the biomass fuel with high burning velocity to the sintering of the iron ores difficult to pelletize, the sintering speed and the utilization coefficient can be improved. The reinforcing method comprises the following steps of: adding 1 to 4 percent of biomass fuel into a sinter mixture containing the iron ores difficult to pelletize, wherein the biomass fuel is required to have 65 to 85 percent of content of fixed carbon, 10 to 25 percent of volatile matter, more than 24 to 30MJ/kg of calorific value, 40 to 60 percent of porosity, 10 to 100m2/g of specific surface area and 1 to 4mm of average particle size; after weighing the iron ores difficult to pelletize, a flux, sintering return fines and the biomass fuel according to the weight ratio, sufficiently mixing the raw materials and pelletizing; distributing the mixture, igniting and sintering to obtain agglomerates. After the biomass fuel is adopted to reinforce the sintering of the iron ores difficult to pelletize, the sintering speed can be improved by 2 to 5mm/min, the utilization coefficient can be improved by 0.2 to 0.4t/(m2.h) and meanwhile, low intensity variation of an agglomerate revolving drum is ensured.

The invention relates to a process for treating and comprehensively utilizing a vanadium-titanium magnetite. The process is characterized by comprising the following steps: (1) treating a raw vanadium-titanium magnetite by crushing, tailings discarding, fine grinding, low-intensity magnetic separating, high-intensity magnetic separating, and separating by a shaking table, so as to obtain a titanium concentrate and a high-vanadium-ferrum concentrate; (2) adding an adhesive to the high-vanadium-ferrum concentrate; uniformly mixing and pelletizing; drying; uniformly mixing with pulverized coal or coke powder; distributing; performing controlled reduction that V is not reduced through a coal based shaft furnace so as to obtain sponge iron, wherein the amount of used reducing agents such as the pulverized coal is 30 to 70% of the weight of high-vanadium-ferrum concentrate powder, and the reduction is performed for 10 to 18 hours at the temperature of 850 to 1060 DEG C; (3) heating the obtained sponge iron for 0.5 to 1.0 hour at the temperature less than 1050 DEG C through an intermediate frequency/ main frequency furnace under a weak reduction atmosphere; then heating until the temperature is more than 1500 DEG C; performing melt separation to enable vanadium to enter slag, thus obtaining high-grade vanadium slag and high-purity molten iron. With the adoption of the process, a plurality of valuable elements in the vanadium-titanium magnetite can be effectively separated and utilized with high additional value.

The process of extracting Cr2O3 and V2O5 from high-chromium vanadium titanium magnetite includes the following steps: 1. smelting molten iron containing V 0.28- 0.50 wt% and Cr 0.5-2.5 wt% with high-chromium vanadium titanium magnetite in a blast furnace or an electric furnace; 2. air refining the molten iron to obtain V-Cr slag with V2O5 not less than 6 wt% and Cr2O3 not less than 15 wt%, and semisteel; and 3. separating V2O5 from the V-Cr slag through crushing, roasting, leaching and purifying; adding ammonium salt into separated liquid and regulating pH value to 2-10, so as to prepare Cr2O3. The present invention recovers and utilizes valuable metal from molten iron without affecting iron and steel production.

The invention relates to a method for preparing sinters of vanadium titano-magnetite, which belongs to the technical field of vanadium melting. The method for preparing the sinters has high sintering speed and high barrate strength, and particularly comprises the following steps: a. 51 to 57 portions of concentrated vanadium titano-magnetite, 15 to 19 portions of mineral powder A, 4 to 6 portions of mineral powder B, 6 to 8 portions of mineral powder C and 4.5 to 6 portions of coke breeze are prepared into mixture; b. 4 to 6 portions of limestone, 1.5 to 5.5 portions of quicklime and 50 weight percent of the mixture in step a are uniformly mixed for pellet fabrication; c. 1.5 to 5.5 portions of the quicklime and 50 weight percent of the mixture in step a are uniformly mixed, and pellets prepared in step b are placed into the mixture and rolled for pellet fabrication; and d. the pellets prepared in step c are sintered, and the sinters of the vanadium titano-magnetite are obtained after natural cooling of the pellets. The quality of the sinters prepared is obviously improved; and the surface layer fuel speed of pelletized particles can be quickened and the solid fuel consumption can be reduced under the condition of melting in a blast furnace.

The invention provides a direct reduction roasting-magnetic separation red mud comprehensive using method based on a rotary kiln, and belongs to the technical field of resource comprehensive using. According to the method, red mud serves as a raw material, coal powder is a reducing agent, titanomagnetite is an addition agent, starch and bentonite are binder for conducting ball pressing, iron is recovered by adopting a direct reduction roasting-magnetic separation technology, amendment is added into tailings after the iron is recovered for adjusting ingredients, and then, after cement is added, different kinds of building materials are produced. The method has the advantages that the red mud can be fully used, after the red mud and titanomagnetite are mixed, reduction roasting is conducted, the titanomagnetite can improve conducting of the reducing process, meanwhile, the low-cost coal is used as the reducing agent, after the tailings obtained from magnetic separation are conditioned, the building materials can be produced, finally, direct reduction iron blocks with iron grade of more than 92% are obtained, the recovery rate of the iron is normally higher than 85%, and other ingredients meet the requirements of direct steelmaking.

The invention provides a method for separating iron, vanadium and titanium in vanadic titanomagnetite. According to the method, most of vanadium is left in slag by controlling a direct reduction temperature, iron enters a magnetically-separated substance, a by-product sodium sulphate obtained through fractional crystallization carried out through sodium-modification vanadium extraction wastewater, is added in vanadium-titanium slag after magnetic separation, and vanadium is extracted in a water-leaching manner after oxidation roasting, so as to obtain vanadium-containing solution and titanium-rich slag. According to the method, on one hand, the recovery rate of vanadium is increased, on the other hand, due to a small amount of the vanadium-titanium slag, lots of sodium salt has no need to be added, and moreover, the small amount of the added sodium salt is treated by virtue of the sodium-modification vanadium extraction wastewater to obtain the by-product, thus cost is saved, secondary resource recycling is realized, and economic benefits are improved; and in addition, the magnetically-separated substance obtained in a manner of carrying out magnetic separation at first, and then adding sodium salt in vanadium-titanium slag and carrying out oxidation roasting, is relative pure compared with the magnetically-separated substance obtained in a manner of adding sodium salt and carrying out oxidation roasting at first, and then carrying out magnetic separation, a sulphur content of the magnetically-separated substance is low, and the quality is guaranteed.

The invention relates to the technical field of vanadium titano-magnetite smelting, and provides a method for smelting vanadium titano-magnetite with a HIsmel smelting reduction process. The preheatedand pre-reduced vanadium titano-magnetite is directly sprayed into a HIsmel smelting reduction furnace through a mine gun of the HIsmel smelting reduction furnace, the temperature of hot air, the oxygen content of the hot air, the blowing amount of mineral powder, the blowing amount of pulverized coal and the blowing quantity of flux are controlled, the percentage content of FeO in slag is controlled, the over-reduction reaction of TiO2 is restrained, and generation of TiC, TiN and TiCN in the slag and molten iron is reduced. High melting point solid particles TiC, TiN and TiCN are preventedfrom being produced in the molten iron and the slag, so that the objective of all vanadium-titanium ore smelting which is not achieved in the long process of current blast furnace ironmaking is achieved, vanadium titano-magnetite ore resources are used in large scale, and the technical problem that TiO2 in the blast furnace slag cannot be continuously utilized due to low grade is solved.

The invention belongs to the technical field of metallurgy and particularly relates to a direct reduction-magnetic separation method of vanadium titanomagnetite. The method comprises the following steps of: grinding iron ore concentrate powder and pulverized coal, evenly mixing and molding; putting a blank into an airtight lidded crucible, and burying the crucible in pulverized coal; directly reducing ferric oxide for 60-300 minutes at 1250-1350 DEG C on the condition that the molar ratio of C to O is 1.2-1.4 so that ferric oxide is deoxidized to generate metal iron, thus obtaining a reduzate of which the metallization rate is 85-94%; and crushing the cooled reduzate, and carrying out magnetic separation to obtain iron powder with a grade of 85-90% and titanium slag containing 60-70% of titanium. By utilizing the technical scheme of the invention, primary separation of iron, vanadium and titanium is realized; after magnetic separation, 60-70% of vanadium in raw materials enters into magnetic products and 60-70% of titanium is remained in non-magnetic products and the iron recovery rate can reach 90-95%.

The invention provides a direct vanadium extracting method for vanadium-titanium magnetite. The method comprises the steps that calcification roasting is conducted by taking a mixture of the vanadium-titanium magnetite and a carbon-based additive as a raw material, a calcification roasting product is subjected to aftertreatment, and then vanadium-containing liquid is obtained. According to the method, the vanadium recycling rate is high; the impurity content of leachate is low, and a high-purity vanadium product can be prepared through simple impurity removal; no waste gas is generated, the operation technology is simple, the equipment requirement is low, and the technology cost is low; the vanadium extracting process does not influence iron making, tailings obtained after vanadium extracting do not contain sodium salt and can be directly subjected to ore blending for iron making, and then comprehensive utilization of vanadium-titanium magnetite resources is achieved.