18 results about "Blast furnace" patented technology

The invention belongs to the technical field of a refractory castable, and particularly relates to a castable for a blast-furnace tapping channel and a preparation method thereof. The castable comprises the following components: 55-80wt% of fused brown corundum, 8-21wt% of silicon carbide, 0.01-5wt% of carbon source, 2-8wt% of alpha-alumina micro powder, 1-7wt% of fused white corundum, 0.5-5wt% of silica powder, 1-5wt% of calcium aluminate cement, 0.3-4wt% of elemental silicon powder, 0.01-0.4wt% of water reducing agent, 0-0.2wt% of organic fibers and 0-0.2wt% of aluminum powder. The preparation method comprises the steps of dry-blending the components for 10-180 seconds, additionally adding water accounting for 4-6wt% of the raw materials, and stirring for 1-8 minutes so as to obtain the castable. Carbon nanotubes are introduced to the castable for the tapping channel so as to partially or totally replace spherical asphalt and be uniformly distributed in the castable, and can be filled into tiny gaps so as to improve the compactness of the castable, so that the anti-erosion and anti-scouring properties of the castable are improved, toxic smog formed in the process of baking the spherical asphalt is reduced, and the body injury of workers and the environmental pollution caused by the toxic smog are reduced; the castable has the characteristics of excellent properties, long service life and environmental friendliness.

The invention belongs to the technical field of waste head and complementary energy recovery in iron and steel Industry, and in particular relates to a method for preparing methanol by sensible heat of blast furnace slag. The method comprises the following steps: blast furnace slag enters into a sensible heat recovery device; reactants enter into a grain slag packed bed to be preheated, and enter into a graining reactor when the temperature reaches 600 DEG C; the reactants enter into the graining reactor for reaction at 850 DEG C and at one barometric pressure to generate methanol. High temperature residual heat resources of liquid blast furnace slag are efficiently, economically and environment-friendlily used in an energy-saving manner. Treated blast furnace slag can meet the demand of cement manufacturing, and methanol produced belongs to a product widely applied with high additional value. Ternary reforming reaction of methane can realize part of self-heat supply, so that the energy efficiency in the reaction process is greatly enhanced, the cost is lowered, and carbon deposited on the surface of the catalyst can be alleviated or even eliminated. Coke oven gas resource is adequately utilized, the energy resource is saved, carbon dioxide in flue gas is utilized, and emission of greenhouse gases is reduced, so that the method is energy-saving and environment-friendly.

The invention relates to a high density total oxygen short process high-efficiency cleaning iron-making process. The high density total oxygen short process high-efficiency cleaning iron-making process mainly comprises the following steps: S1, uniformly mixing wide-grained iron ore powder, anthracite powder and slaked lime powder and then granulating; S2, putting the wide-grained carbon-containingpellet obtained in S1 into a rotary kiln for carrying out deep self-reduction; S3, dedusting, cooling and carrying out CO2 removal treatment on exhaust gas of the rotary kiln to obtain upgrading coalgas, and introducing the upgraded coal gas into the rotary kiln again for secondary combustion; S4, carrying out hot charging on the wide-grained metallized pellet obtained in S2 into a melting gasifier and carrying out final reduction melting; S5, respectively discharging slag and molten iron from the corresponding cinder notch and iron notch. The comprehensive energy consumption of the processis reduced by 30 percent compared with a traditional blast furnace process, the coal powder burnout ratio is greater than or equal to 90 percent, the concentration of reduction components is greater than or equal to 90 percent and the CO2 removal rate of the coal gas is greater than or equal to 90 percent; the coking, sintering and pelletizing procedures which have the maximum pollution emission of iron steel enterprises are eliminated, so that energy consumption and pollutant emission are reduced from the source.

The invention discloses a composite high-magnesia flux for sintering, which is prepared by compounding two fluxes containing magnesium, namely magnesium limestone powder and serpentine according to certain weight proportion, wherein the mixture ratio of the magnesium limestone powder in a sintered mixture is between 1 and 2.5 percent, the mixture ratio of the serpentine in the sintered mixture is between 0.5 and 2 percent, and the proportion between the magnesium limestone powder and the serpentine can be properly adjusted within the mixture ratio range according to conditions of sintered raw materials and concrete requirements of an iron-making blast furnace on the MgO content in sintered ore. The flux radically avoids the negative effect on the iron-making blast furnace caused by lower MgO content in imported fine ore; the flux eliminates the disadvantageous situation of constituent fluctuation of the sintered ore caused by adding a MgO flux during the sintering, and realizes the dual aims of improving the quality of the sintered ore and reducing the cost for the flux; and the flux greatly reduces the using amount of calcium oxide, makes white spot phenomenon in the mixture basically disappear, apparently lightens the phenomena of sticking and blocking of a mixing machine and a storage hopper, and has steadier and smoother sintering process.

The invention discloses a blast furnace stockline descending top temperature controlling and detonation preventing method. The method specifically comprises the steps that (1) a special furnace top atomized water injector is mounted, specifically, a purchased special furnace top atomized water injector is utilized for replacing a traditional water injecting pipe, and when being sprayed out of thefurnace top sprinkling atomized water injector, water is atomized to form water mist, wherein the diameter of water drops in the water mist is 10-20 [mu]m; and (2) N2 is sprayed and injected from a furnace body static pressure measuring hole and an air port coal lance, specially, before stockline descending, a pressure measurer is dismounted, an N2 spraying pipe is connected and communicates withan N2 pipe network of a blast furnace, and the air port coal lance stops spraying coal during stockline descending and only performs N2 spraying and injecting. By means of the method provided by the invention, the furnace top temperature decreasing effect can be improved, and in addition, the situation that the water drops have no time to vaporize and make direct contact with liquid slag iron canbe avoided; and furthermore, the method for spraying and injecting the N2 from the furnace body static pressure measuring hole and the air port coal lance is simple and feasible, the sprayed and injected N2 gas dilutes coal gas, it is guaranteed that the content of O2 in the coal gas meets standards while a large air capacity is maintained for descending the stockline, and the stockline descendingtime is shortened by around 15 h.

A composite desulfurizing agent for iron and steel is prepared from calcium carbonate (10-45 wt.%), fluorspar (2-10 wt.%), lime (10-45 wt.%), carbon-bearing substance (0-10 wt.%) and assistant through low-temp sintering and mixing. Its advantages are high desulfurizing speed and effect and low cost.

The invention relates to a blast furnace charge-flow adjusting valve device suitable for high-temperature furnace charge. The blast furnace charge-flow adjusting valve device suitable for the high-temperature furnace charge mainly comprises a valve body, an inner valve plate, an outer valve plate, an inner shell, a wear resistant liner, transmission shafts and an oil cylinder drive device, wherein the inner valve plate and the outer valve plate are arranged inside the valve body. A driving device is arranged on one side of the external of the valve body, a driving device is arranged on the other side of the external of the valve body, each driving device is connected with one transmission shaft independently, and the two transmission shafts oppositely and respectively stretch into the valve body in a straight line. The outer valve plate and the inner valve plate are sequentially connected to each transmission shaft from the end to the inside, the left end of the outer valve plate is connected with the inner side end of the left side transmission shaft through splines, the right end of the outer valve plate is supported on the inner side end of the right side transmission shaft, the left end of the inner valve plate is supported on the inner side end of the left side transmission shaft, and the right end of the inner valve plate is connected with the inner side end of the right side transmission shaft through splines. The blast furnace charge-flow adjusting valve device suitable for the high-temperature furnace charge is small in size, firm in structure and convenient to mount and arrange, can be conveniently used to accurately adjust the furnace charge, and can be simultaneously suitable for blast furnaces with parallel hoppers and blast furnaces with hoppers connected in series. By means of the blast furnace charge-flow adjusting valve device suitable for the high-temperature furnace charge, the high-temperature protection problem of sealing components in a high temperature environment can be effectively solved, and the occurrence rate of operational failure can be effectively lowered.

The invention discloses a method and a system for controlling molten iron transportation, which are applied to the field of smelting. The method comprises the following steps that a tank matching plan of the current time of molten iron transportation is acquired, a molten iron tank car is selected according to the tank matching plan, and unique identification information of the molten iron tank car in the current operation period is generated; when the molten iron tank car runs to a first blast furnace and is empty during normal running, the molten iron tank car is confirmed according to the unique identification information, and iron is received from the first blast furnace to the molten iron tank car; iron number information of iron received by the molten iron tank car at the current time is generated, and distribution information of the molten iron tank car is generated according to the iron number information and the unique identification information; and when the molten iron tank car runs to a target tank transfer station and runs normally, the molten iron tank car is checked by using the distribution information. The method and system solve the technical problem that management and control over existing molten iron transportation are not facilitated.

The invention relates to a slag removal device for an outlet of a molten iron runner of an iron making blast furnace. A bracket is mounted at the outer side of the molten iron runner; a lifting table is mounted on the bracket in a vertical sliding manner; a lead screw capable of transversely sliding is mounted on the lifting table, and the end part of the lead screw, facing the molten iron runner, is connected with a high-temperature-resistant connection; and a scraper is mounted at the end part of the connection rod, which extends into an inner runner. In the slag removal device provided by the invention, the bracket is mounted on the ground at the outer side of the molten iron runner; the lifting table capable of vertically sliding is mounted on the bracket; the lead screw capable of transversely sliding is mounted on the lifting table; and the scraper is mounted at the end part (which extends into the inner runner) of the connection rod connected with the lead screw, and vertically moves along with the lifting table and transversely moves along with the lead screw. Therefore, sediments at the bottom of the inner runner can be cleaned. If the slag removal device is out of use, the scraper can depart from the inner runner along with the lead screw, so as not to block the normal flowing of molten iron, so that the slag removal device is very convenient.

The present invention makes it possible to ascertain the particle size distribution of inserted material each time material has been inserted. The particle size distribution monitoring device according to the present invention comprises an information acquisition device for, at least once each time material has been inserted, acquiring information for identifying the particle size distribution of the inserted material and an information processing device for processing the information. The information processing device comprises a particle size distribution identification unit for identifying a particle size distribution each time material has been inserted on the basis of the information acquired by the information acquisition unit at least once each time material has been inserted and a particle size distribution display unit for visualizing the particle size distributions that have been identified by the particle size distribution identification unit each time material has been inserted, associating the visualized particle size distributions for each time material has been inserted with each time material has been inserted, and displaying the same on a screen.

The invention discloses a blast furnace cloth belt fly ash flotation reagent and an application method thereof, and relates to the technical field of blast furnace cloth belt fly ash flotation, the blast furnace cloth belt fly ash flotation reagent comprises a collecting agent, an inhibitor, an activating agent, a dispersing agent, an adjusting agent and a foaming agent; the collecting agent is amodified oil-based collecting agent, wherein the content of the collecting agent is 10-30 parts by weight; the inhibitor is a zinc mineral inhibitor, and the content of the inhibitor is 1-15 parts byweight; the activating agent is a fine particle carbon powder activating agent, and the content of the activating agent is 1-5 parts by weight; the dispersing agent is a fine-grain mineral dispersingagent, and the content of the dispersing agent is 5-20 parts by weight; the content of the regulator is 1-5 parts by weight, and the content of the foaming agent is 0.1-0.5 part by weight. The invention provides the blast furnace cloth belt fly ash flotation reagent. The flotation reagent can give full play to the synergistic effect of all the components, is good in selectivity and high in collecting performance, has a very good flotation effect on secondary carbon of blast furnace fine-grained fly ash, can achieve the concentrate carbon grade of 70% or above and the recovery rate of 74% or above, can well inhibit floating of zinc minerals, and can achieve efficient zinc mineral enrichment.

The invention discloses a slag-iron separation method in an initial stage of reblowing after long-time damping down of a large blast furnace, and belongs to the technical field of molten iron smelting. The method comprises the following steps: (S101) a substrate is provided with an anchorage piece; then, a board refractory is poured; the thickness of the board refractory is larger than the heightof the anchorage piece; and a baffle plate is formed and dried for future use; (S102) a distance small pit is selected to enter the upstream; the baffle plate is aslant inserted in a main ditch; the board refractory faces an iron notch; and a gap between the baffle plate and the side of the main ditch is fully filled and compacted by yellow sand; (S103) the iron notch is opened; and when more slagor weak fluidity of the molten iron is generated during tapping, the baffle plate is not shifted, and slag and iron are discharged into a dry slag pit through a slag groove; and (S104) when the fluidity of the molten iron is normal, the baffle plate is pulled away, and the molten iron passes through a slag remover to enter a tank. The iron slag with weaker fluidity in the initial stage of reblowing after long-time damping down of the large blast furnace can be safely discharged, so that the heat consumption in the furnace is reduced, the recovery progress of the blast furnace is accelerated,the next discharge of the molten iron is fully prepared, and the smooth recovery progress of the blast furnace is guaranteed.

The application discloses a manufacturing method of high-performance marine concrete. The method comprises the following steps: Step 1, weighing the following raw materials (by weight): 35-50 parts of cement, 9-15 parts of medium-coarse sand, 10-11 parts of crushed stone, 20-26 parts of blast furnace slag, 13-19 parts of coal ash, 2-5 parts of silica fume, 1.5-3 parts of a rebar corrosion inhibitor and 0.5-2 parts of a water reducing agent; Step 2, taking out medium-coarse sand and washing off dirt on the surface, taking out cleaned medium-coarse sand and airing to remove moisture; Step 3, taking all cement, putting cement into an agitator and stirring; Step 4, continuously adding crushed stone, blast furnace slag, coal ash and silica fume into the agitator, and uniformly stirring the mixture; Step 5, continuously adding the rebar corrosion inhibitor into the agitator, and adding a few amount of water; and Step 6, continuously adding the water reducing agent into the agitator, and stirring for 1 min so as to prepare the high-performance marine concrete. The concrete has low apparent density, strong corrosion resistance and good stability. By the use of lots of medium-coarse sand and crushed stone, apparent density of the concrete product is reduced. The product is applicable to severe environments such as a maritime environment.

The invention discloses an energy saving control system based on superconduction cooling waste heat power generation of a trilinear driving type blast furnace. The energy saving control system is composed of a blast furnace body (1), a power generation system (12), a steam utilizing device, one or more annular superconductive heat exchange rings (2) which are arranged along the side wall of the blast furnace body (1) in a layered and surrounding mode, a waste heat controlling and disposing system and the like. The waste heat controlling and disposing system comprises a diode rectifier U, a voltage stabilizing and transforming circuit and a three-terminal voltage stabilizing control circuit. The waste heat controlling and disposing system is characterized in that a trilinear driving circuit is further connected between the voltage stabilizing and transforming circuit and the three-terminal voltage stabilizing control circuit in series. According to the energy saving control system, by means of the annular superconductive heat exchange rings internally embedded in the side wall of the blast furnace body and an annular pipeline system corresponding to the annular superconductive heat exchange rings, hot water subjected to heat exchange is guided out intensively, and the heat exchange efficiency and cooling efficiency are improved; in addition, the temperature of traditional cooling water is increased from 40 DEG C to 250 DEG C, then the cooling water is overheated to 400 DEG C by utilizing the conductive heat exchange rings twice, and therefore the cooling waste heat can be utilized for power generation.

The invention discloses a molten iron jar melting agent and a preparation method and application of the molten iron jar melting agent. The molten iron jar melting agent is composed of, by weight, 0 to 100% of jet coal, 0 to 100% of anthracite, 0 to 100% of industrial salt and 0 to 100% of aluminum powder, wherein the sum of the weight percents of the components is 100%. The preparation method specifically includes the steps of A pretreatment and B preparation, wherein in the pretreatment process, materials are prepared according to a formula of the molten iron jar melting agent, the anthracite and the jet coal are smashed for use, and the industrial salt and the aluminum powder are purchased for use; in the preparation process, the smashed anthracite, the smashed jet coal, the industrial salt and the aluminum powder are weighed according to the proportion of the formula and then mixed and stirred evenly, so that a target object is obtained. The molten iron jar melting agent is placed in a molten iron jar before iron is placed in a blast furnace and 200 kg to 500 kg of the molten iron jar melting agent is added each time. The anthracite, the jet coal, the industrial salt and the aluminum powder are reasonably combined, so that the polymer effect is generated, the effect that one plus one is larger than two is achieved, an intense combustion reaction is generated after the agent is added to the surface of molten iron, and the reaction is complete.

The invention discloses a blast furnace soft water leakage detecting device, and belongs to the technical field of blast furnace leakage detection. The blast furnace soft water leakage detecting device comprises a blast furnace body, wherein the blast furnace body is internally provided with ring pipes at intervals, and three-way valve pipes are installed outside the blast furnace body at intervals; one ends of the ring pipes penetrate through the blast furnace body and communicate with the three-way valve pipes; communicating pipes are connected to the other ends of the ring pipes, and everyadjacent ring pipes are in pipeline connection through the communicating pipes; and a cooling wall is installed on the inner surface of the blast furnace body, and cooler pipelines are installed on the inner side of the cooling wall, the cooler pipelines communicate with the three-way valve pipes. The blast furnace soft water leakage detecting device has simple process, and a soft water path can be adjusted and blocked by the three-way valve pipes; the faulted cooler pipeline is isolated during the detection, and the change of pressure readings is observed through a pressure gauge to judge whether an isolated unit leaks water or not; and most of the cooler pipes are normally cooled, the normal operation is not affected, and centralized maintenance is more facilitated.