67results about How to "Increased drum strength" patented technology

The invention relates to a method for two-stage coal injection in blast furnace ironmaking and a device thereof. The invention is characterized in that the inventive two-stage coal injection device provided with a special distributor, an inert gas special pipeline, a plurality of control valves, a flowmeter and a control meter is utilized, fixed operational programs are executed and partial technological parameters are controlled, thus realizing the two-stage coal injection of the blast furnace; through practical production verification for 40 days, by adopting the device and method, blockage of injection guns is effectively avoided; the average coal ratio of the blast furnace is increased by 11.35kg/tHM; and the coke ratio is reduced by 9.87kg/tHM.

The invention discloses a sintering process of manganese ore powder. The process comprises the following steps of: adding water to mix manganese ore powder, a binding agent, fuel, a fluxing agent and return ore as mixed ore, wherein the binding agent is formed by mixing manganese salt and organic matter and counts for 0.6-3.0% of mass of the mixed ore, the fuel counts for 3.0-6.0% of mass of the mixed ore, the fluxing agent counts for 3.0-15.0% of mass of the mixed ore, the return ore counts for 10-30% of mass of the mixed ore and the adding amount of water counts for 5.0-15.0% of mass of the mixed ore; preparing the mixed ore as pellets; and then coating a layer of fuel on the surfaces of the generated pellets, drying and preheating, subsequently firing and sintering as hot-sintered ore; and cooling, breaking and screening the hot-sintered ore to obtain finished product sintered ore and return ore. The sintering process of manganese ore powder disclosed by the invention combines the advantages of the pelleting process and the sintering process, so that the strength and the yield of the finished product sintered ore are greatly enhanced and the energy consumption is obviously reduced.

A method for applying Bayan Obo ore ultra-fine iron powder in sintering is a using method in sintering before iron making and belongs to the technical field of ferrous metallurgy sintering. The method for applying the Bayan Obo ore ultra-fine iron powder in sintering is characterized by comprising the steps of evenly mixing and pelletizing Bayan Obo ore main ore concentrate 16%-31%, Bayan Obo oreultra-fine iron ore concentrate 17%-31%, Mongolia ore powder 8.0%-9.0%, limestone 4.9%-5.1%, dolomite 2.4%-2.6%, unslaked lime 2.1%, coke powder 4.4%-4.5% and returned ores 30%, then performing sintering in a sinter pot and supplying sintered finished ores for a blast furnace, wherein the alkalinity of the sintered ores is controlled in a range of 1.90-2.05, and MgO is controlled in a range of 1.9%-2.1%. The Bayan Obo ore ultra-fine iron powder is added into sintering mixed materials, thereby improving air permeability and the yield of the sintered ores. In addition, solid burn-up is reduced remarkably, and the process is simple.

The invention discloses a method for sintering ore blending of Jianshan concentrate fines and limonite, which comprises the following steps of: (1) preparing materials at a sintering site; (2) pre-humidifying Yangdi fines; (3) preparing iron materials; (4) blending the prepared iron materials, flux and fuel; (5) mixing the materials in a primary mixer; (6) pelletizing in a secondary mixer; (7) forcefully pelletizing in a ternary mixer; (8) distributing and pressing the materials; (9) igniting and keeping temperature; (10) sintering by pumping air; (11) cooling; (12) granulating. The method is mainly characterized in that: when the Yangdi fines are pre-humidified, the pre-humidifying moisture reaches 8.5 to 9.5 percent; in step (3), the iron materials comprise 40 to 50 parts of Jianshan fines, 33.5 to 43.5 parts of humidified Yangdi fines, 10 to 16 parts of pilbarablend (PB) fines and 0 to 4 parts of mixed fines; and in step (4), the mass part ratio of the mixed iron materials to blast-furnace return mine to lime to dolomite to coke powder is 77.8-78.8: 7-8: 4.8-5.7: 6-7: 2-3. In the invention, the ore blending is low in cost and cheap minerals are used rationally.

The invention relates to a blast furnace slag recycling method. The blast furnace slag recycling method comprises the following steps of: (1) crushing blast furnace slag to the particle size of below 100mm, and sieving the crushed blast furnace slag to obtain powder with the particle size of less than 20mm and lump materials with the particle size of greater than 20mm; and (2) sequentially grinding and magnetically separating the powder to obtain magnetic powder and non-magnetic powder, wherein the magnetic powder is used as a part of sintering raw material to be sintered, and the lump materials are used as a part of furnace charge to be smelted in a blast furnace. The blast furnace slag recycling method can be used for effectively recycling the blast furnace slag and is particularly suitable for recycling the blast furnace slag with relatively high iron content.

The invention discloses a low-carbon and low-NOx sintering method based on reasonable distribution of fuel. According to the low-carbon and low-NOx sintering method based on reasonable distribution offuel, a lower fuel layer is mainly fed with new fuel which is high in burning speed, relatively low in heat value and low in nitrogen content, an upper fuel layer is fed with fossil fuel which is lowin burning speed and high in heat value, flue gas with high in CO content in an intermediate air bellow of a sintering machine is circulated to a sintered material surface at the same time, and latent heat of the flue gas is fully utilized for further supplementing heat to the upper fuel layer. According to the low-carbon and low-NOx sintering method based on reasonable distribution of fuel, thecharacteristics that the sintering speed changes from low to high from the upper fuel layer to the lower fuel layer, and heat storage changes from low to high, the difference between the burning speedof the new fuel and the fossil fuel, and the difference between the heat value of the new fuel and the fossil fuel are effectively coupled, the CO latent heat in the fuel gas is efficiently utilized,and at the same time of increasing sintering yield and improving quality indexes, solid fuel consumption of each ton of sinter is reduced by 2kgce to 4 kgce, CO emission is reduced by 30% to 50%, NOxemission is reduced by 40% to 60%, and low-carbon and low-NOx sintering is implemented.

The invention discloses a low-carbon low-emission sintering method based on coupled injection of multiple gases. Based on the difference of heat storage capacities of parts at the heights of differentmaterial layers, areas from thermal insulation completion to a waste gas temperature rising point of a material surface of a sintering machine are sequentially divided into a low heat storage capacity area, an intermediate heat storage capacity area and a high heat storage capacity area according to the temperature intervals smaller than 1250 DEG C, 1250-1300 DEG C and 1300-1350 DEG C, and high heating value gas with the injection heating value being larger than 30 MJ/Nm<3>, an intermediate heating value gas with the injection heating value being 15-30 MJ/Nm<3> and low heating value gas withthe injection heating value being smaller than 15 MJ/Nm<3> are separately injected to the three areas. The low-carbon low-emission sintering method effectively couples the differences between the heating capacity requirements and the gas quality of different areas of the sintering material layer, realizes heating capacity balanced distribution of the material layers at different heights, forms a beneficial ore-forming condition, greatly improves the sintering quality and the quality index, meanwhile, effectively expands the coverage area of gas injection, further reduces the solid fuel consumption, increases the emission reduction ratio of pollutants such as NOX, SO2 and COX, and realizes the low-carbon low-emission sintering.

The invention provides a novel additive for improving tumbler strength of vanadium-titanium magnet sintered ore. The novel additive contains, by weight percentage, 10-30% of B2O3, 5-20% of NaCl, 3-9% of NaNO3 and 45-85% of CaCl2, and the addition amount is 0.04-0.06%. The additive is added in a manner that the additive is prepared into a solution, the solution is added to a sintering mixed material when mixing for the first time is conducted, and a sintering test is conducted. It is indicated through test results that the content of magnetite, the content of hematite and the content of perovskite in the sintered ore are decreased; the content of calcium ferrite, the content of dicalcium silicate and the content of vitreous substances are increased; the air hole rate of the sintered ore is reduced; the proportion of maculosus-granular structures which are poor in strength in an ore phase structure is reduced; the proportion of corrosion structures which are good in strength is increased; the ore phase structure becomes more uniform; and furthermore, compared with that of sintered ore with no additive added, tumbler strength is improved by 1.5-3.5%.

The invention discloses casting coke bricks and a production method thereof, which belong to the production technology of coke for industrial use. The product is made of the following raw materials in weight ratio: 60%-72% of low-sulfur anthracite, 10%-15% of graphite, 2.5%-3% of tar, and the balance is waste paper pulp. The low-sulfur anthracite is crushed to a diameter of 0.5-2 mm. After preheating and drying, it is mixed with graphite, tar, and waste paper paddles in a kneading mixer, and then shaped by a pressure molding machine. The temperature of the kiln is raised to 800 Carbonize at ~1000°C for 6-9 days, and cool down to room temperature naturally to obtain cast coke bricks. No need to add coking coal during production, the production cost is low, and the process is simple. Cast coke bricks have high calorific value, fixed carbon can reach more than 85%, volatile content can be controlled below 1.5%, drum strength can reach more than 98%, high density, durable and flame-resistant. Ash content ≤ 10%, sulfur content < 0.4%, less ash content, low sulfur content, full combustion, less exhaust gas emission, and easy transportation.

The invention discloses a method for preparing a sintering ore from high-crystallite ferrihydrite powder. The method includes the following steps of firstly, preparing a raw material from, by mass, 75-90% of iron powder, 3.5-8.5% of limestone, 0-4% of light-burned dolomite, 1.5-2.5% of serpentine, 3.0-4.5% of quick lime and 4.5-6.0% of coke powder; secondly, adding water to the raw material to bemixed to obtain a mixture, and performing granulating to obtain granules; and thirdly, performing distributing, igniting and sintering on the granules to obtain the sintering ore. The obtained sintering ore has the alkalinity of 1.95-2.05, the MgO mass percentage of 1.90-2.10% and the tumbler strength of larger than or equal to 65.8%, can be effectively used for production in a blast furnace, andensures the long-term smoothness of the production in the blast furnace.

The invention discloses F-containing sintered ore and a production method thereof. The production method provided by the invention comprises the following steps of 1) proportioning the following components including, by mass, 5%-15% of iron ore concentrate A, 65%-75% of iron ore powder B, 3.5%-8.5% of limestone, 0-4% of light calcined dolomite, 1.5%-2.5% of serpentine, 3.0%-4.5% of quick lime and4.5%-6.0% of coke powder, and obtaining a raw material; 2) adding water into the raw material, performing mixing to obtain a mixture, and performing granulating to obtain granules; and 3) performing distributing, igniting and sintering on the granules to obtain the F-containing sintered ore. The prepared F-containing sintered ore has the drum strength of more than or equal to 65.5%, can be effectively used for blast furnace production, and ensures long-term smooth operation of the blast furnace production.

The invention provides a centrifugal extraction machine drum resistant to strong acid corrosion. The centrifugal extraction machine drum is used for completing mixing and separating of two kinds of incompatible liquid unequal in density. The problems that a drum is low in strength, complex in structure and nonresistant to strong acid corrosion are solved. The centrifugal extraction machine drum is high in strength, easy to machine, accurate in size and resistant to strong acid corrosion.

The invention provides a method for preparing formed coke. The method comprises the following steps: 1, preparing a sodium silicate aqueous solution and a sodium bentonite aqueous solution; 2, adding coal tar, the sodium silicate aqueous solution and the sodium bentonite aqueous solution into pulverized coal, uniformly mixing, filling a steel mold with the mixture, performing cold press molding by utilizing a hydraulic press, and demolding to obtain a blank material; and 3, drying the blank material in a drying oven, and naturally cooling to obtain the formed coke. The formed coke prepared by adopting the method is an organic-inorganic composite material, and novel formed coke with high cold strength can be produced by adopting the cold press molding method; and the type of coal mines can be selected without strict requirements, and formed coke with high tumbler strength can be prepared by utilizing lean coal, meager lean coal and other weak caking coal.

The invention discloses a fuel gradation homoenergetic sintering method and relates to the field of strand sintering of iron ore powder in the metallurgical production system and chemical reaction kinetics. According to the method, the automatic heat accumulation function in the sintering process of a material bed is considered, the fuel usage amount is gradually reduced in the height direction of the material bed, so that the sintering material bed can keep stable production performance of high temperature and uniformity from top to bottom, and the effects of high quality, high yield and low energy consumption are achieved; the method aims for energy consumption reduction and waste heat recovery in the steel production, has the eyes on the characteristic that automatic heat accumulation can be conducted on a thick material bed in the sintering technique with higher energy consumption and solves the problem that the quality of sintered ores in the height direction of the material bed is uneven, so that the yield of the sintered ores is reduced, and sintering energy consumption is increased, so that the utilization efficiencyof waste heat and the utilization factor, the tumbler strength and the yield of the sintered ores are improved, and the average grain diameters of finished ores are increased.

The invention relates to a sintering production process of a mixed material and particularly relates to a fluctuation treatment method of a sinter bed based on master pumping regulation. The method provided by the invention completes the sintering process in a qualified manner by monitoring the thickness of a bed on a vehicle to determine the master pumping rotating speed and adjusting the sintering time of a skip car if the bed is thick, so that the sinter quality is improved, the drum strength is improved, the rate of return mine of sintering is reduced, and the circular material amount is reduced. The problem of red ores easy to appear when the bed is thick is avoided, and the service life of a product belt is prolonged.

The invention belongs to the technical field of metallurgy, and particularly relates to an economical method for preparing a carbon-containing pellet, a carbon-containing pellet prepared through the method and a smelting process of the carbon-containing pellet. The economical method for preparing the carbon-containing pellet comprises the following steps that 1, hematite powders used for preparingthe carbon-containing pellet are divided into first hematite powders and second hematite powders by the mass ratio of 0.8:1.2; 2, Fe2O3 in the first hematite powders is converted into Fe3O4 to obtainmagnetite powders; and 3, the magnetite powders obtained in the step 2, the second hematite powders in the step 1 and coal powders are mixed to obtain the carbon-containing pellet, and the mass ratioof the mass sum of the magnetite powders and the second hematite powders to the coal powders is (6-8):3. The economical method for preparing the carbon-containing pellet can effectively improve the DRI metallization rate of carbon-containing pellets, enhances the drum strength, and is capable of saving energy and economical, and the carbon-containing pellet is convenient to transport and store.

The invention discloses a pressurized densification sintering method for laterite nickel ore, which includes steps of: 1) mixing laterite nickel ore, return mine powder, a fuel, and quicklime to obtain a mixture material; 2) regulating water content of the mixture material to 16-18 wt%, and performing mixing granulation to obtain a sintering material; 3) loading the sintering material in a sintering machine and igniting the sintering machine; 4) applying an external force field to the surface of the sintering material and sintering the sintering material to obtain thermo-sintered ore; 5) removing the external force field and cooling the thermo-sintered ore, and crushing and sieving the product to obtain a sintered ore finish product. In the method, by applying a certain pressure to the surface of the laterite nickel ore sintering material, loosen sintered ore from the surface layer to the middle layer can be auto-densified, so that strength and yield of the sintered laterite nickel orecan be improved.