8604 results about "Iron ore" patented technology

The invention relates to the melting coating of alcohol-base or water-base anti-penetrating sands, which uses the fireproofing bone materials, the floating agent, the felting agent, the reinforcing agent and the carrier as the preparing coating. The weight shares of the said coating are: 100,3-8,3-7,0.2-1.0 and 30-40. The invention uses chrome iron minerals as the main materials and is prior to any kinds of the traditional coating.

A method of making metallic iron in which a compact, containing iron oxide such as iron ore or the like and a carbonaceous reductant such as coal or the like, is used as material, and the iron oxide is reduced through the application of heat, thereby making metallic iron. In the course of this reduction, a shell composed of metallic iron is generated and grown on the surface of the compact, and slag aggregates inside the shell. This reduction continues until substantially no iron oxide is present within the metallic iron shell. Subsequently, heating is further performed to melt the metallic iron and slag. Molten metallic iron and molten slag are separated one from the other, thereby obtaining metallic iron with a relatively high metallization ratio. Through the employment of an apparatus for making metallic iron of the present invention, the above-described method is efficiently carried out, and metallic iron having a high iron purity can be made continuously as well as productively not only from iron oxide having a high iron content but also from iron oxide having a relatively low iron content.

The invention discloses a benefication method for recovering specularite. The method comprises the processes of primary grinding, grading, primary low intensity magnetic separation, and tailings discarding by primary high intensity magnetic separation; rough concentrate pre-classification by the primary low intensity magnetic separation and the primary high intensity magnetic separation, secondary grinding, secondary low intensity magnetic separation to obtain concentrates, secondary high intensity magnetic separation to obtain concentrates; and selective flocculation desliming secondary conducted on high intensity magnetic separation tailings (middlings), and anionic reverse flotation. The method further comprises the step of arranging a cylindrical slag separating sieve before the primary high intensity magnetic separation. With the advantages that the iron concentrate grade and the iron recovery are high, the loss of granular iron minerals is low, the mineral process flow is short, concentrates and tailings can be obtained in advance and the energy consumption of the benefication is low, the invention can be used not only for selecting specularite ores, but also for selecting weakly magnetic iron minerals, such as hematite, goethite, siderite, limonite, and the like.

Molten iron is prepared by (1) providing iron oxide and a carbonaceous reducing agent, (2) preparing a shaped product from the carbonaceous reducing agent and the iron oxide, (3) preparing solid reduced iron from the shaped product, wherein the solid reduced iron has a metallization of at least 60%, a specific gravity of at least 1.7, and a carbon content of at least 50% of the theoretical amount required for reducing the iron oxide remaining in the solid reduced iron, and, (4) before substantial cooling occurs, heating the solid reduced iron in an arc heating-type melting furnace at a high temperature. The molten iron can be prepared efficiently from iron ores of relatively low iron content without causing erosion of refractories, at high energy and high reduction efficiencies, and by a simple operation in a simple facility.

The invention provides a plastic compound, which comprises a plastic substrate component and a catalyst component, wherein the catalyst component is selected from one kind or two or more kinds of oxides of the metal elements in the ninth line, the tenth line and the eleventh line of the periodic table of elements except copper, silicates, borates and oxalates of the metal elements in the ninth line, the tenth line and the eleventh line of the periodic table of elements, hydrogenation catalysts with the metal elements in the ninth line, the tenth line and the eleventh line of the periodic table of elements and ABO2 type compound oxides with a delafossite structure; A is selected from one kind of the metal elements in the ninth line, the tenth line and the eleventh line of the periodic table of elements, B is Ni, Mn, Cr, Al or Fe, and A and B are different from each other. The invention also relates to application of the plastic compound in the selective metallization of a plastic surface. Moreover, the invention provides a method of the selective metallization of the plastic surface. When the method is applied, the circuit can be further easily formed.

The invention relates to iron coke for a blast furnace and a preparing method thereof. The iron coke comprises 5wt%-20wt% of iron ore powder and 80wt%-95wt% of mixed coal; the mixed coal is formed by mixing 25wt%-29wt% of one third of coking coal, 40wt%-44wt% of coking coal, 7wt%-11wt% of lean coal, 6wt%-10wt% of gas-fat coal and 12wt%-16wt% of fat coal; the iron ore powder and the mixed coal are mixed uniformly with water and tamped before entering the blast furnace, and are placed into the blast furnace when the temperature is 800 DEG C, the temperature is increased at the speed of 2 DEG C per minute to 3 DEG C per minute, the iron ore powder and the mixed coal are discharged from the blast furnace when the temperature is 950-1050 DEG C, and the iron coke is obtained by adopting a wet way of quenching the coke. According to the iron coke and the preparing method, the performance, the ratio, the particle size and the composition and the like of the iron ore powder and the mixed coal are optimized, and the strength and the reactivity of the iron coke can meet the requirement of the blast furnace process under the circumstance of not adding binding agents.

The invention discloses a preselecting method of low-grade magnetic iron ore, comprising the steps of crushing the raw ore of the magnetic iron ore by coarse crushing, intermediate crushing and fine crushing operations, conveying to subject to ultra-fine crushing operation, and then crushing by a high-pressure roller mill, scattering the crushed product by a wet cylindrical sieve, conveying the ore on the cylindrical sieve to the vibrating sieve by a belt to perform wet gradation, conveying the ore on the vibrating sieve to a dry magnetic separator by the belt to discard the waste, returning the ore concentrate of the dry magnetic separator to the high-pressure roller mill to crush the ore concentrate again, perform magnetic separation and discarding tailings of the ore concentrate below the vibrating sieve and the ore concentrate below the cylindrical sieve in a wet coarse grain intermediate-field intensity magnetic separator, and selecting the coarse ore concentrate of the intermediate-field intensity magnetic separator by a grinding separation technology. The invention has the advantages that the invention selects quantities of qualified mine tailings by wet magnetic separation before grinding ore, reduces ore grinding work, reduces ore grinding energy consumption and has high system processing capacity; the invention can be widely used in magnetic ore dressing plant, and in particular suitable for treatment of preselecting low-grade magnetic iron ore with the iron grade lower than or equal to 22%.

The invention discloses a method for concentrating extremely low-grade refractory magnetite to achieve higher-grade iron ore concentrate. The process proposal comprises the following steps of: dry type magnetic separation and tailing rejecting, stage grinding, wet type magnetic separation, magnetic concentrate fine screening classification, minus sieve magnetic separation, plus sieve regrinding and recleaning and concentrate extraction directly through magnetic separation of an electromagnetic wreathed column. Namely, on the basis of conducting stage grinding separation on crude ore, electromagnetic concentration, fine screening and plus sieve regrinding and recleaning are implemented to improve the final iron ore concentrate grade. With the method adopted, the production cost is reduced,the concentrate grade is raised up to 71.96 percent, the tailings grade is decreased to 4.50 percent and the secondary pollution to the environment is also avoided.

The invention relates to a beneficiation method for removing long quarry impurities by adopting strong magnetic flotation, comprising the steps of crushing, grinding, sieving, desliming, strong magnetically floating, floating, concentrating and dewatering. The concrete beneficiation method comprises the following steps of: breaking and grinding ore in a ball mill; grading ground minerals by a spiral grader and a hydraulic hydrocyclone twice; combining with the ball mill into a closed cycle; respectively mounting high-frequency linear vibration sieves in overflows graded twice; respectively removing impurities over 3 mm and 1 mm, such as mica, grass-roots bark, and the like; removing most of muddy substances from minerals through desliming equipment after the impurities are removed; removing mechanical iron, weakly magnetic iron ore, tourmaline and partial mica in a strong magnetic flotation machine; floating the minerals passing through the strong magnetic flotation machine again to remove residual iron minerals, mica and black minerals; and finally, concentrating and dewatering the minerals to form a product.

The invention belongs to the fields of chemical engineering and metallurgy and in particular relates to a process system which adopts a circulating fluid bed to carry out magnetization roasting on limonite, siderite, sedimentary hematite and other refractory iron ore powder bodies. The process system adopts a high-efficiency low-resistance reactor of the circulating fluid bed to carry out the magnetizing roasting to the iron ore powder body; firstly, roasted tail gas in a combustion chamber releases latent heat of unreacted reducing gas through combustion; secondly, the roasted tail gas exchanges heat with the cold iron ore powder body through a multilevel cyclone preheater to reclaim heat; and finally a fluidizing cooler is adopted to reclaim sensible heat of high-temperature roasting ore. The process system has the advantages of high magnetizing roasting efficiency and full heat reclaiming and utilization in the roasting process and the like, can reduce energy consumption of the refractory iron ore powder body in the process of magnetizing roasting and improve the economical efficiency of the refractory iron ore in the process of magnetizing roasting.

A process and system for producing reducing gases are disclosed, wherein volatile components derived from coal are transformed into reducing gases suitable for utilization as synthesis gas, as a reducing agent for the direct reduction of iron ores and/or as a clean fuel.

The technological process of separating and extracting metal elements from V-Ti iron ore includes the steps of: agglomerating ore powder of mixing V-Ti iron ore powder, reductant, additives and adhesive, pressing the mixture into 10-25 mm diameter agglomerates and drying at 80-90 deg.c; reducing inside one bottom rotating furnace to obtain metal products; smelting the metal products in an electric furnace to obtain molten iron and V-Ti slag component, and smelting the V-Ti slag component to obtain V-Cr oxide and Ti slag as the material for producing titanium while. The present invention has high reduction temperature, fast reduction speed, short reduction time, high production efficiency, high metal and V-Ti recovering rate and less environmental pollution.

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 present invention relates to one kind of tearproof antiwear conveying belt, and belongs to the field of rubber product technology. The tearproof antiwear conveying belt is produced through pre-pressing and mixing natural rubber, styrene butadiene rubber and cis-butadiene rubber inside a Banbury mixer; adding promoter, activator, leveler and antiaging agent before further mixing; adding reinforcing agent, softening agent and aramid fiber before further mixing to obtain mixed rubber; mixing for the second time and adding cross-linking agent inside a Banbury mixer after being set for some time; discharging batch to obtain mixed rubber; rolling to form rubber sheet; combining rubber sheet with tension element belt blank, rolling up and sulfurizing; and trimming to obtain the product. The tearproof antiwear conveying belt has excellent tearproof performance, excellent antiwear performance and long service life, and is suitable for use in mines.

Metallic iron is produced from a composition formed from a mixture of iron ore particles and particles of a reductant made of a biomass material, a coal or coke in a particulate form together with a flux and is processed in a loose, un-agglomerated non-pelletized, non-briquetted form in a reducing furnace to produce metallic iron directly from the ore. An excess of biomass or coal or coke reductant can be used to provide CO and H that can be recovered as a synthetic gas and converted to electrical or other energy. Metallic iron nuggets or slabs can be produced from manganiferous ores or concentrates. Manganese can be caused to enter the nugget or slab or the slag by adjusting the furnace temperature. Titaniferous ores or concentrates can be used to produce metallic iron slabs or nuggets and a titanium-rich slag.

The invention provides an efficient separation method for low-grade and complex iron ores. The method is characterized in that the complex iron ores of different grades and species are classified, so as to obtain lump ores and mineral powder which are balled, dried and preheated; reduction roasting, cooling, ball milling, magnetic separation, ball milling and magnetic separation or reverse flotation are performed in turn, so as to obtain iron ore concentrate or reduced iron powder; classification treatment is to crush and screen the iron ores with iron-containing grade between 50 and 56 percent and then dry and preheat obtained ores; fine-grained mineral powder is ground, washed, ground, deslimed and separated so as to obtain the iron ore concentrate and slime containing 58 to 60 percent of iron; the slime which is washed, deslimed, and separated is dewatered and dried and is added to and well mixed additives, so as to be balled then; the iron ores with the iron-containing grade between 40 and 50 percent are crushed and screened so as to obtain the lump ores which are directly dried and preheated, while the fine-grained mineral powder is obtained through dry-type grinding and then is added to and well mixed the additives so as to be balled then; and the iron ores with the iron-containing grade between 25 and 40 percent are crushed and screened so as to obtain the lump ores which are dried and preheated, while the fine-grained mineral powder is subjected to grinding, gravity separation or high-gradient magnetic separation and reverse flotation, so as to obtain coarse iron concentrate powder which is added to and well mixed with the additives and then is balled.

The invention relates to a high-efficient combined inhabitor for pyrite in complex sulfide ores and the application method of the inhabitor. The inhabitor comprises calcium superoxide and HA-Na. The inhabitor of the invention can inhibit complex vulcanized iron-bearing minerals selectively, has better inhibition properties for magnetic pyrite, pyrite and arsonopyrite, and is an inhabitor of high selectivity. Compared with the prior inhibitors such as lime, cyanide, bichrome, potassium permanganate, sodium sulfide, sulphite, zinc sulphate and trisodium phosphate, the invention has the advantages of lower use level, good effects, no pollution, and other advantages.

The invention relates to a building product and the generating method thereof, in particular to a construction special-purpose plate and the manufacturing method thereof. The invention is made of the following raw material according to the parts by weight: 20 to 50 percent of thermoplastic resin comprising polyvinyl chloride, polyethylene and polypropylene, 50 to 80 percent of bulking agent comprising iron ore waste tailing sand, calcium carbonate and slag, and additive occupying 0.05 to 5 percent of the gross weight of the thermoplastic resin and the bulking agent and comprising plasticizer, heat stabilizer and lubricating agent. The product is made by adopting a stone molding and extrusion moulding way, no pollution is produced, no distortion exists, the product is moistureproof and fireproof, the processing waste and the disposed plate of the product can be recycled and newly processed to ensure zero waste, the damage to the environment cannot be caused, and the product is made into a hollow plate structure which has the advantages that the elasticity and the sound insulation effect are good and the heat transfer effect is good, therefore, the invention is very suitable for the heating of a geothermic pipeline, and the difficult problem that a wooden compound floor plate in the present market cannot be used for the heating of the northern geothermic building because of the distortion due to the heating or poor heat insulation heating effect is solved.

The invention discloses a process for treating mixed-type iron ore. The process comprises the following steps: raw ore is crushed and then subjected to primary grinding and primary grading which form closed circuit grinding; after primary overflow is subjected to crudeness/fineness grading and coarse grains are sorted through a gravity separation device, spiral chute concentrate is fed into a fine screen with large mesh size, and undersize products are coarse-grain concentrate; after gravity separation tailings are subjected to tailings discarding through intermediate-magnetism sweeping, intermediate-magnetism sweeping concentrate, gravity separation middlings and oversize products are merged into coarse-grain middlings; the middlings are fed into an open-circuit grinding system consisting of secondary grading and secondary grinding and reground, and then return to crudeness/fineness grading; fine grains after crudeness/fineness grading are sorted through a magnetic separation device; magnetic separation concentrate is fed into the fine screen with small mesh size, and the undersize products are fine-grain concentrate, while the oversize products are fine-grain middlings which are directly fed into two-stage grinding so as to be reground; fine-grain concentrate and the coarse-grain concentrate are merged into final concentrate; and intermediate-magnetism sweeping tailings and the magnetic separation tailings are merged into final tailings. The process has the advantages of good flow stability, easy operation and capability of effectively recovering the mixed-type ore and fully utilizing mixed-type ore resources.

A beneficiation method for ultrafine fraction cassiterite is characterized in that a swirler is used for desliming to obtain swirler settled sand and deslimed tailings; sulfide ores are separated from the swirler settled sand so that the sulfide ores and desulfurized tailings are obtained; iron is removed from the desulfurized tailings by means of magnetic separation to obtain iron ore concentrate and deironed tailings; flotation tin concentrate and flotation tailings are obtained after secondary roughing flotation, secondary scavenging flotation and tertiary blank concentration flotation for the deironed tailings; and a table concentrator is used for performing gravity concentration for the flotation tin concentrate to obtain tin concentrate, tin middlings and table concentration tailings. The grade of the tin concentrate is higher than 40%, the tin recovery rate of the tin concentrate is higher than 50%, the grade of the tin middlings ranges from 1% to 3%, the tin recovery rate of the tin middlings is higher than 15%, and the overall tin recovery rate of the tin concentrate and the tin middlings is higher than 65%. The beneficiation method for the ultrafine fraction cassiterite is high in recovery rate, low in production cost, high in tin grade and applicable to recovery of the ultrafine fraction cassiterite with the silt content ranging from 10% to 30%.

The present invention is directed to additives for coal-fired furnaces, particularly furnaces using a layer of slag to capture coal particles for combustion. The additive(s) include iron, mineralizer(s), handling aid(s), flow aid(s), and/or abrasive material(s). The iron and mineralizers can lower the melting temperature of ash in low-iron, high alkali coals, leading to improved furnace performance.