30results about How to "Steady and straight" patented technology

The invention provides a high-aluminum low-magnesium blast furnace iron-making raw material and a method for high-aluminum low-magnesium blast furnace iron-making by using the high-aluminum low-magnesium blast furnace iron-making raw material. The high-aluminum low-magnesium blast furnace iron-making raw material consists of high-aluminum low-magnesium sintered ore, pellet ore and raw ore; the blast furnace material is free of magnesium-containing ore; the high-aluminum low-magnesium sintered ore is prepared from a mixture of high-aluminum low-magnesium iron ore powder and auxiliary sintering materials in a sintering way; the pellet ore is ordinary pellet ore; the raw ore is high-grade iron ore concentrate. In the blast furnace iron-making process, the high-aluminum low-magnesium sintered ore and the ordinary pellet ore together with reasonably added raw ore are adopted, and appropriate blast furnace operation mechanisms are selected, so that the coal gas flow can be reasonably distributed in the blast furnace iron-making process, the blast furnace slag is good in property, the slag iron can be smoothly discharged, stable and smooth operation of a blast furnace is maintained, and the pig iron making cost is lowered.

The invention relates to a method for controlling the abnormal furnace temperature of a blast furnace according to temperature changes of a cooling wall. According to the method, the fall-off positions and the fall-off amount of blast furnace slag crusts are timely identified through the data mining technology according to the temperature conditions of the cooling wall of the blase furnace, cooling water inlet-outlet water temperature change conditions and blast furnace heat load change conditions, then the measures that additional coke is added inside the blast furnace through a furnace top PLC system and the air temperature, the coal powder injection amount and the oxygen enrichment amount of an air blower on the lower portion of the blast furnace are adjusted are further taken to enable the furnace temperature to be controlled to be in a stable level, the stable and smooth operation of the blast furnace is ensured, and the blast furnace can run at the optimum interval. The control accuracy of the abnormal furnace temperature of the blast furnace is improved, and the service life of the blast furnace is prolonged.

The invention provides a method for smelting vanadium-titanium magnetite in a blast furnace, which comprises the following steps of: controlling blast kinetic energy, air quantity and air speed of the blast furnace with different furnace volume in different ranges respectively, and forming an air inlet with the length of 450 to 480mm on the two sides of an iron notch of the blast furnace respectively; controlling the blast oxygen enrichment rate in the range of 2.6 to 3.0 percent; controlling the blast temperature in the range of 1,150 to 1,200 DEGC; and controlling the furnace temperature of the blast furnace in the range of 1,450 to 1,500 DEG C. By methods of adjusting the blast kinetic energy, blast volume and the blast temperature, controlling feeding rate, the reaction temperature of the blast furnace and slag basicity, and the like, the strengthened smelting of the vanadium-titanium magnetite in the blast furnace is realized, the utilization factor of the blast furnace is improved, and iron loss is reduced.

A preparation method of an iron ore powder pelletized magnesian binding agent comprises the following processing steps that firstly, mixed adding is carried out, wherein, according to raw material ratio, 90%-95% of sepiolite and 5%-10% of magnesia are included, and according to the mass percent of the prepared chemical components, SiO2 is smaller than 60%, MgO is larger than 18%, Al2O3 ranges from 3% to 6%, the blue absorption power ranges from 18m.mol / 100g to 20m.mol / 100g, the two-hour water absorption rate ranges from 100% to 105%, the expansion capacity ranges from 2ml / g to 3ml / g, and after raw materials are prepared, a spiral stirrer or cylindrical mixer is used for full mixing; secondly, rough breaking is carried out, wherein a hammer type breaker or jaw type breaker is used for breaking a mixture of the sepiolite and the magnesia to be particles with the granularity smaller than 3 mm; and thirdly, grinding is carried out, wherein a raymond mill or medium-speed mill is used for continuously grinding the mixture broken to the particles with the granularity smaller than 3 mm in a fine manner to -200 meshes, and the occupation is above 95%. The magnesian binding agent is used for replacing bentonite and other efficient binding agents for producing, the pelletizing performance is greatly improved, the pressure of MgO is improved while the sintered ore is reduced, stability and the improvement of the quality of the sintered ore are facilitated, and the production process is simple.

The invention discloses an online switching process for blast furnace blowers. The online switching process comprises the following steps that (1) when molten iron is output from a blast furnace, a standby blower is started, and the wind outlet pressure of the standby blower is regulated to F+(4-6) kPa, wherein F is equal to 70-75% of the wind outlet pressure of a main blower before the molten iron is output from the blast furnace; (2) after the molten iron is output from the blast furnace, the wind outlet pressure of the main blower is regulated to the value of F selected in the first step, and a wind supply valve and a communication valve in a standby wind supply pipe network are opened; and (3) under the condition that wind outlet pressure fluctuation of the main and standby blowers iscontrolled at + / -5 kPa, a valve on a diffusion pipeline in the standby wind supply pipe network is gradually closed, a valve on a diffusion pipeline in a main wind supply pipe network is gradually opened at the same time until a check valve on a wind supply pipeline in the main wind supply pipe network is automatically closed due to the decreased wind volume, and then a wind supply valve and a communication valve in the main wind supply pipe network are closed. By means of the online switching process, the main and standby blowers can be switched online in stable, rapid and safe modes.

The invention discloses a blast furnace high-aluminum slag smelting method to mainly solve the technical problems of unstable production and high blast furnace molten iron smelting cost of blast furnace high-aluminum slag smelting blast furnaces in the prior art. The blast furnace high-aluminum slag smelting method comprises the following steps: 1, preparing a raw material: preparing the raw material according to the following control requirements: the slag-iron ratio is not more than 300 kg / t and the mass percentage content of Al2O3 in the slag is not more than 17%, adding small-size coke to the raw material, uniformly mixing the raw material and the small-size coke to form ore layers, wherein the raw material comprises, by mass, 70-80% of sintered ores, 15-17% of lump ores and 3-15% of pellet ores, and the small-size coke accounts for 2-5% of the mass of the raw material; 2, distributing: alternately distributing the coke and the ore layers in a blast furnace to form layer and coke layer alternating structure; 3, carrying out blast furnace smelting; and 4, normally discharging iron. The method realizes low-cost high-aluminum slag smelting of the blast furnace.

The invention relates to a determining method of the reasonable oxygen enrichment rate of a blast furnace. The determining method is characterized in that aiming at the blast furnace with the effective furnace volume of 450-6,000 m<3> applying an oxygen enrichment process, in the daily production process, the blast volume, the spray-blow coal ratio, the volatile matter content of spray-blow mixedcoal powder, the grain size of the spray-blow mixed coal powder, the iron content of raw materials in the furnace, and the hot reactivity of coke in the furnace are taken as reference data to determine the reasonable oxygen enrichment rate of blasted hot air in the blast furnace. According to the operation indexes of the blast furnace in different stages, the mathematic correlation between the operation indexes and the oxygen enrichment rate of the blast furnace is built to determine the reasonable oxygen enrichment rate of the blasted hot air in the blast furnace, thus, stable operation of the blast furnace is achieved while production of the blast furnace is enhanced, and meanwhile, the effects of reducing fuel consumption and the production cost of iron making can be further achieved.

A control method for blast furnace top material distribution comprises the following steps that 1) the material distribution period of an initial charging system and the material distribution period of a final charging system are set, and the switching step length of the material distribution periods is set; 2) material distribution parameters of an initial charging system and a final charging system are set; 3) the blast furnace conducts circulating material distribution according to the initial charging system and the final charging system in sequence, and the furnace condition of the blast furnace is judged, specifically, if the furnace condition is not stable, material distribution parameters or material distribution periods of all the charging systems are adjusted; and if the furnace condition is stable, the material distribution period of the initial charging system is reduced once according to the switching step length of the material distribution period, and the material distribution period of the final charging system is increased once according to the switching step length of the material distribution period; and 4) the step 3) is repeated until the material distribution period of the initial charging system is zero.

The invention relates to a tundish cover castable and a method for preparing a tundish cover by using the same, aiming at preventing the tundish cover from cracking, peeling, chipping and the like. The formula of the tundish cover castable comprises 55 to 65 wt% of alumina particles, 10 to 20 wt% of alumina fine powder, 2 to 4 wt% of silicon micro powder, 3 to 5 wt% of prefabricated powder, 5 to 10 wt% of prefabricated particles, 3 to 6 wt% of alumina micro powder, 0.1 wt% of metal aluminum powder, 3 to 6 wt% of aluminate cement, 1 to 3 wt% of stainless steel fiber, 0.1 wt% of sodium tripolyphosphate, 0.02 to 0.1 wt% of propylene glycol alginate and 4 to 6 wt% of water. The method for preparing the tundish cover by using the castable comprises the following steps: putting the mixed castable in a mold for vibration molding, conducting standing at room temperature for 24 hours, and then carrying out heat treatment at 110 DEG C for 24 hours.

The invention provides an automatic conveyor chain start / stop control method based on a profile steel conveyor chain control system. The automatic conveyor chain start / stop control method is applicable to the technical field of electrical drive control. According to the method, the automatic start / stop control over the advancing step pitch of a conveyor chain is achieved through a circulatory-pulse generator under different duty ratios, automatic start / stop control over the advancing step pitch of the conveyor chain is achieved under the condition of not using a conveyor chain moving positiondetection encoder, the problem that the conveyor chain moving position detection encoder frequently fails due to the poor working environment is solved, and the stable operation of a large H-shaped steel production line is guaranteed.

The invention discloses a single-hook and double-hook conversion type hook head of hoisting equipment. The single-hook and double-hook conversion type hook head comprises a double-hook hook head connected to the hoisting equipment, wherein the lower end of the double-hook hook head is detachably connected with a single-hook hook head; two connecting pieces are arranged on the upper portion of the single-hook hook head, and when the single-hook hook head is connected to the double-hook hook head, the two connecting pieces are clamped in grooves of the double-hook hook head correspondingly; and each connecting piece is a convex hanging rod, a hook or a hanging ring. According to the single-hook and double-hook conversion type hook head of the hoisting equipment, the utilization rate of the 80T crown block in the production process can be improved; and particularly, after finished steel coil transportation equipment breaks down, an anchor-head-hook hook head can be quickly converted into the single-hook hook head, and the single-hook hook head can be matched with a C-shaped lifting appliance to participate in the operation activity of lifting finished steel coils from a coiling machine, so that the production rhythm is stabilized, the production guarantee is improved, the accident potential of production interruption is completely eradicated, and stable and smooth production is ensured.

The invention discloses a method for matching coke and adding the coke into a furnace in the blast furnace smelting process. The technology of the method comprises the steps that according to the smelting need, the coke is matched according to the high-low sequence of indexes and added into the blast furnace; according to the indexes from high to low, CSR>M10>the average grain size>M40>the ash content>CRI>the sulfur content; the coke is firstly matched according to the indexes of the highest sequence and added into the blast furnace; if the operation state of the blast furnace is good, coke index modification is stopped; if the operation state of the blast furnace is still poor, the coke is matched according to the indexes of the next sequence and added into the blast furnace; and whether the coke is matched according to the indexes of the next sequence or not is judged according to the operation state of the blast furnace till the operation state of the blast furnace is good. According to the method, the technical aim of adding multiple kinds of coke into the furnace at the same time can be achieved, the situation of excessive coke indexes is avoided, and high-quality coking coal resources are saved; and it is guaranteed that the blast furnace stably and smoothly operates, and meanwhile the ironmaking cost is reduced. The method has the beneficial effects of being simple in technology, high in operability and easy to implement.

The invention relates to a method for calculating a blast furnace burden distribution drop point based on laser measurement data. The method comprises the following steps of 1, calibrating basic data; 2, dividing a calculation range; 3, calculation of any angle under a basic stock line; and 4, calculating the inclination angle of any chute under any stock line. According to the technical solution, on the basis of material flow data measured by laser when a blast furnace is opened, a series of derivation calculation methods are used for calculating the material distribution drop points of ore and coke at different chute inclination angles and different material lines, and accurate basic data are provided for fine adjustment of an upper system of the blast furnace.

The invention relates to a stable welding method for the argon arc welding of high-silicon-content silicon steel which containing more than 2%of Si, which comprises the following steps: carrying out structural design on a welding inverse electrode for supporting the formation of weld seams, designing an electrode groove in the length direction on the upper surface of the welding inverse electrode, and designing the cross section of the electrode groove into a circular arc, wherein the width of the electrode groove is 4-10mm, the radius of the circular arc is 5.5-15.5mm, and the depth of the arc-shaped electrode groove is 0.6-3.6mm; and welding, and arranging a steel plate to be welded on the welding inverse electrode, wherein the welding seam clearance is 0.4-2.0mm, the welding speed is 1500-2900mm / min, the wire feed speed is 10-35m / min, and the fusion start set value and the fusion stop set value are respectively set to 0.1-1.5s and 0.2-2.0s. The stable welding method for the argon arc welding greatly improves the quality of lower surfaces of welding seams, the infused energy can be diffused more quickly, the abnormal growth of crystal grains can not be found in the thermal reaction region, and the mechanical property of the welding seams is greatly enhanced.

The invention provides a timing gear protecting device of a forming machine. The timing gear protecting device comprises a limiting switch and a motor control device. The limiting switch is installedon a backward track of a movable roller of the forming machine and composed of a limiting touch plate and a switch body, wherein the switch body is an electric contact switch, and the original state of a pair of electric contacts is a connection state; the motor control device is connected in a power circuit of the forming machine, and the motor control device is an electric connection device which is formed by a forward compression roller instruction relay in the power circuit of the forming machine, contacts of the forward compression roller instruction relay, a backward compression roller instruction relay in the power circuit of the forming machine, contacts of the backward compression roller instruction relay, a detection limiting relay, contacts of the detection limiting relay, a forward maintenance relay, contacts of the forward maintenance relay, a backward maintenance relay, contacts of the backward maintenance relay, a forward maintenance button, a backward maintenance button, a limiting switch, an alarm light, an forward solenoid valve of the forming machine, a backward solenoid valve and a main motor frequency converter of the forming machine. By means of the timing gear protecting device, the gap expanding situation of compression rollers can be reflected in real time, and the situation is avoided that the gap between a fixed roller and a moving roller is excessively expanded, so that equipment failures are caused.

The invention relates to a fracture deviation rectifying device and a rail power supply slide wire system, and belongs to the technical field of coke oven electricity. The fracture deviation rectifying device comprises a mounting part used for mounting a first rail slide wire, and a positioning part located at the end, away from the mounting part, of the fracture deviation rectifying device and used for positioning a second rail slide wire so as to limit the longitudinal deviation range and the transverse deviation range of the fracture. The invention further provides a rail power supply slidewire system, the rail power supply slide wire system comprises a plurality of rail slide wires which are sequentially connected in series, a fracture is formed between every two adjacent rail slide wires, and each fracture is provided with one fracture deviation rectifying device. When the fracture deviation rectifying device is used at the fracture, the fracture fault of the rail power supply slide wire system can be effectively avoided, and stable and smooth operation of a coke oven vehicle power supply system is ensured.

The invention provides a red coke quenching method and a quenching device, and belongs to the technical field of coking. The method comprises the following steps: carrying out water quenching on red coke to obtain first coke; carrying out atomization quenching on the first coke to obtain wet quenched coke. In the atomization coke quenching, fog drops and a first coke temperature meet the following relation: when the first coke temperature is greater than or equal to 400 DEG C, the fog drops consist of air with the volume fraction of 30-50% and water drops with the volume fraction of 50-70%; when the first coke temperature is greater than or equal to 150 DEG C and less than 400 DEG C, the fog drops consist of air with the volume fraction of 60-80% and water drops with the volume fraction of 20-40%. By adopting the coke quenching method provided by the invention, the moisture content in the coke can be controlled to be 3.25-3.45%, the moisture content is low, the quality of the coke is improved, the maximum moisture value is 4.5-4.9%, the minimum moisture value is 2.1-2.5%, the fluctuation range is reduced, the moisture is more uniform, and the coke ratio and the fuel ratio are reduced because the stable and smooth operation of the blast furnace is ensured.