45results about How to "Increase sinter production" patented technology

The invention relates to a sintering mixing water-feeding checking and controlling system, in particular to a Fuzzy-PID compound control system for sintering mixing water-feeding, which comprise a PID control strategy, a check instrument and a controller, wherein the control process of the Fuzzy-PID compound control system comprises: initializing the system data, setting a valve opening degree and a feedback valve opening degree error |e|, judging if |e|=|e0|, when |e|<=|e0|, using the PID control strategy, when |e|>=|e0|, using Fuzzy control strategy, when the PID control is switched to the Fuzzy control, the output of the adjuster holds the output value UPID under the PID control strategy until the Fuzzy controller output |UF|>=|UPID|, when the Fuzzy control is switched to the PID control, the output of the adjuster holds the output value UF under the Fuzzy control strategy until the PID controller output |UPID|<=|UF|. The invention improves the permeability of sintered mixture, improves the thickness of sintered layer, the speed of sintering machines and reduces sintering negative pressure.

The invention belongs to the technical field of iron and steel metallurgy, in particular relates to a blast furnace smelting method by using a vanadium-titanium two-phase sintering ore. The blast furnace smelting method by using vanadium-titanium two-phase sintering ore is characterized in that the blast furnace burden structure is as follows: 70-100wt% of vanadium-titanium two-phase sintering ore, 0-30wt% of vanadium titanium magnetite pellet and 0-10wt% of common iron ore, wherein the common iron ore is an iron ore containing no vanadium or titanium. The invention provides the blast furnace smelting method by using vanadium-titanium two-phase sintering ore, and the method is low in cost; vanadium-titanium titanic magnetite for blast furnace smelting is provided by the vanadium-titanium two-phase sintering ore, so as to optimize the blast furnace burden structure, improve the breathability of the blast furnace burden structure and perfect the technical-economic indicator of blast furnace smelting.

The invention relates to an automatic control system for sintering ignition furnaces, in particular to a Fuzzy-PID compound control system for sintering-machine ignition furnaces. The system comprises PID control strategy, instrumentation and a control device. A control process comprises: controlling ignition temperature by regulating the amount of fuel and air flow; automatically finding a suitable air-fuel ratio on the premise of fixing the air flow in order to realize the highest combustion temperature and the fullest combustion; setting a valve opening degree and a feedback valve opening deviation absolute value e; judging whether the absolute value of e is equal to the absolute value of e0; adopting the PID control strategy when the absolute value of e is less than the absolute value of e0; adopting Fuzzy control strategy when the absolute value of e is greater than the absolute value of e0; allowing the output of a regulator to keep an output value under the original control strategy till next controller output value exceeds the output value when control strategy is switched; and continuously adjusting the air flow while tracking an expected combustion temperature value in order to realize that combustion temperature and the expected combustion temperature are the same or close.

The invention discloses a sintering method for a high-grade vanadium titanium iron ore concentrate. The method comprises the steps which are sequentially performed as follows: fuel pretreatment, burdening, water adding and mixing, pelletizing, ignition sintering, CaCl2 solution spraying and blast furnace smelting, wherein, in percentage by mass, the particle size of coke powder in the fuel after the pretreatment is 0-3 mm, 20%-29% of the coke powder is provided with the particle size smaller than 0.5 mm, quick lime is added twice, the proportion of a second addition is 25%-75%, a mixture which is formed by adding water and mixing contains 7.3%-7.6% of water, the carbon content of the mixture is 4.6%-4.75%, the material layer height during ignition sintering is 660-740 mm, and the mass concentration of the sprayed CaCl2 solution is 1%-3%. According to the sintering method for the high-grade vanadium titanium iron ore concentrate, the processing steps of optimizing sintering processing parameters, comprehensively applying fuel pretreatment, increasing water of the sintering mixture, appropriately reducing the carbon content of the sintering mixture, increasing the material layer height, separately adding fluxing agents, spraying the CaCl2 solution to a sintering ore and the like are adopted, so that the production quality and the low-temperature reduction degradation performance of the sintering ore are substantially improved, and the fuel consumption is 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 paving bedding materials on a sintering machine before paving a mixed material into the sintering machine. The method includes the steps of: (1) paving a first layer of large bedding material on sintering machine trolley grate bars, with the large bedding material being sintered ore with a particle size of 8-12mm and thickness of 10-20mm; and (2) paving a second layer of small bedding material on the first layer of large bedding material, with the small bedding material being sintered ore with a particle size of 3-8mm and thickness of 10-15mm. The paving method for sintering machine's bilayer bedding materials provided by the invention can reduce consumption of large particle grade sintered ore without changing grate bar interval, improving the output of sintered ore and enhancing the utilization rate of blast furnace ditch return mine.

The invention discloses a super-thick material layer sintering method for dual-alkalinity complex sintered ore. Two times of material distribution and two times of ignition are conducted, and a sintering mixture at the upper layer is different from a sintering mixture at a lower layer; the sintering mixture A is firstly added into a sintering trolley, the distribution thickness of the sintering mixture A is 600-800 mm, and the sintering mixture A with the alkalinity being 1.8-2.4 is subjected to down draft sintering through ignition of a first igniter; when the sintering trolley travels to the position where the distance between the sintering trolley and a first ignition system is one fifth to one half of the total length of a sintering machine, the sintering mixture B is added and distributed with the distribution thickness of 400-600 mm, and the sintering mixture B with the alkalinity being not higher than 0.5 is subjected to down draft sintering through ignition of a second igniter; and sintered ore at the upper layer and sintered ore at the lower layer are subjected to cooling uniform-mixing and screening uniform-mixing to form the complex sintered ore with the alkalinity being 1-1.4. By means of the super-thick material layer sintering method, the dual-alkalinity sintered ore can be produced through one-time sintering, the mixed sintered ore with the proper comprehensive alkalinity is formed after uniform mixing, and the sintering cost is lowered; and the number of pellets used for a blast furnace is reduced, and the ironmaking cost is lowered.

The invention discloses a compound sintering method for powdery iron-containing waste mini-pellets, which aims to reduce the environmental pollution of raising dust of powdery iron-containing waste materials and avoid the influence on the sintering quality. The method comprises the steps of: arranging two rows of atomizers in a drum mixer; mixing synthetical powder uniformly through the drum mixer, and performing intensified granulation on the synthetical powder to obtain pellets with the diameters of between 3 and 8mm under the action of a rotary force of the drum mixer; mixing the synthetical powder pellets and coke powder in percentage by weight: 96.5 percent of the synthetical powder pellets and 3.5 percent of the coke powder; distributing the mixture on a belt-type sintering machine after the mixing, adopting a double-sloping girdle ignition furnace, using coke oven gas for ignition at the temperature of 1,050 DEG C, using an exhaust fan at a rate of 4,500m3 / min for air draft, and consolidating to form mini-pellet ore with the diameter of between 3 and 8mm under the condition of the suction negative pressure of 8,500Pa and the sintering temperature of 1,200 DEG C; and adding the mini-pellet ore taken as an iron material into a sintering mixture for secondary sintering consolidation to obtain compound sintered ore.

The invention provides a comprehensive sintering method of large-proportion limonite. The comprehensive sintering method of large-proportion limonite is characterized by comprising the following stepsof (1) preparing the following materials in a mass ratio: 60-75% of limonite powder, 5-10% of imported ore powder, 5-15% of iron ore concentrate powder, 2-5% of dolomite, 2-5% of limestone, 3-5% of quick lime, 5-8% of coke powder and 0-10% of sintered ore minus sieve powder, wherein the total percentage of the components is 100%, and controlling alkalinity to be 1.60-2.0; (2) performing materialmixing for the first time, and controlling moisture to be 5.0-8.5%; (3) performing material mixing for the second time, and controlling moisture to be 6.0-9.5%; (4) performing material distribution: laying bottom materials of which the thickness is 20mm, then laying a sintering material layer of which the thickness is 730-860mm, performing material pressing at edges, and performing water sprayingfor humidifying; and (5) performing sintering so as to obtain sintered ore. Hazardous elements of S and P are effectively reduced, and under the situation of realizing sintering of the large-proportion limonite, fully utilizing limonite resources and reducing cost, high-quality sintered ore can be obtained.

The invention discloses a thick material layer sintering production method. According to the method, an upper layer sintering mixture and a lower-layer sintering mixed material of a sintering machinecan be sintered at the same time through twice material spreading and twice ignition, so that the thickness of a sintered material layer is improved, the yield of sintered ore is improved, and sintering indexes are improved; after primary material spreading and before secondary ignition, special carbon pellets are placed, so that heat supply and mineralization time of an upper material layer can be increased, the quality of upper-layer sintered ore is improved, and the sintered ore return amount is reduced; and the hypoxia problem of a lower sintered material layer is solved, the lower sintered material layer is fully mineralized, and the quality of lower-layer sintered ore is improved.

The invention discloses a method and a device for improving super-thick bed layer sintering permeability. The method includes conducting primary material distribution and ignition when a head of a sintering machine passes through a first material distribution system and a first ignition system, wherein a fuel ratio of a distributed mixed material ranges from 3% to 4.5%; when a trolley runs to a position accounting for 1 / 3-1 / 2 of the total length of the sintering machine, conducting secondary material distribution and ignition through a second material distribution system and a second ignition system, wherein a fuel ratio of the distributed mixed material ranges from 4.5% to 6%; using the material loosening device for treating sinter on the surface before secondary distributing and sintering of the mixed material so as to form pores 30-50 mm in diameter and 80-120 mm in depth on the surface of the sinter; keeping the sum of the primary distributed material thickness and the secondary distributed material thickness not less than 900 mm but not more than 1300 mm, and keeping the ratio of the primary distributed material thickness to the secondary distributed material thickness between 1.25 and 2.5. The method has the advantages that the mixed material sintering permeability can be enhanced, fuel distribution in the mixed material is optimized, sinter yield is increased and solid fuel consumption in sintering is reduced.

The invention relates to the metallurgical field, in particular to a recovery method of blast furnace dedusting ash and a blast furnace dedusting ash sintering material. According to the method, the blast furnace dedusting ash and sintering mixing water are mixed, and blast furnace dedusting ash mortar is made. The blast furnace dedusting ash mortar, an iron-containing material, a fluxing agent, fuel and return mine are subjected to mixing granulation, and a mixed material is made; and finally, the mixed material is sintered. The blast furnace dedusting ash mortar is adopted to perform sintering, the mixed material grain composition can be remarkably improved, the proportion of the +3 mm part in the sintered mixed material is increased, an obvious effect is achieved for improving the breathability of a mixed material layer, and therefore the sintering utilizing coefficient is improved, the sintering mine yield is increased, and therefore the utilizing rate of the blast furnace dedusting ash is greatly increased. The blast furnace dedusting ash sintering material made through the recovery method of the blast furnace dedusting ash is good in breathability and high in sintering utilizing rate.

Upright type heat pipe chilling unit is in use for recycling residual heat. Being entered into heat pipe evaporator and heat pipe preheater in high, middle and low temperature, high heat granules are discharged from chain plate machine. Passing through the preheater and cooling end of heat pipe in the heat pipe evaporator, deoxidized pressed soft water absorbs heat so that temperature is increased gradually to form two-phase flow of vapor-liquid. After entering into steam drum and steam superheater, the said two-phase flow becomes saturated steam gas, which is output to users. Cold air is inducted to annular flue by fan; and another flow of gas from preheater is inducted to annular flue by negative pressure. Through heat exchange at preheater, the confluent flow in the annular flue is drained to dust removal system. The confluent flows of hot air from feeding port and hot air from evaporator enters into steam superheater and bustle pipe etc. and return back to the preheater circularly.

The invention relates to a capacity increasing improvement system of a sintering machine and a process. The system and process are characterized in that original equipment of the sintering machine is improved, and a smoke circulating system is additionally provided. Therefore, on the condition that a main electric dust remover and a desulphurization system which are matched with an original sintering machine are not modified and the amount of smoke exhausted outside is not increased, the area of the sintering machine is effectively increased, the sintering air volume is increased, sintering negative pressure is improved, and the aim of increasing the yield is achieved.

The invention discloses a method for adding water in a superfine hematite powder sintering process, which comprises the following steps: (1) stabilizing the speed of the sintering machine; (2) improving and controlling the water addition method; and (3) modifying the tertiary mixer, and adding water to the mixture in a multipoint dispersed mode. The method implements multisection dispersed water addition to the mixture, enhances the accurate control on the water content in the mixture, improves the granulation effect of the sintering mixture, implements uniform heat transfer in the sintering process, and enhances the sintered ore yield, drum strength, sintered ore powder ratio and other indexes.

The invention discloses an ultra thick bed sintering method adopting pre-sintering. An original belt roasting machine is additionally provided with a mixture distributing device and an igniter, and an exhausting system is adopted in the whole sintering production process. The method comprises the following steps: 1, carrying out primary distribution: paving a bottom material through a bottom material distributing device, and distributing a sintering mixture, wherein the thickness of the primary distributed material bed is 500-900 mm; 2, igniting and sintering: pre-sintering for 8-40 min; 3, secondarily distributing the sintering mixture on the surface of the primary distributed material bed to make the material distribution thickness reach 100-650 mm; and 4, igniting and sintering the obtained secondary distributed material bed under an unchanged sintering exhausting negative pressure, wherein the mixture of the primary distributed material bed is sintered when ignition of the secondary distributed material bed is completed, and the sum of the thickness of the primary distributed material bed and the thickness of the secondary distributed material bed is not lower than 900 mm; the running speed of a sintering machine in the whole sintering time is 1.5-2.5 m / min, the sintering exhausting negative pressure is not lower than 7000 pa, sintering of the primary distributed material bed and the secondary distributed material bed is completed at the tail of the sintering machine, and the whole sintering time is 20-70 min.

The present invention relates to a method for treating waste and old battery by using sintering process and its system. Said method includes the following procedures: breaking waste battery, screening, low-temperature roasting (recovering mercury), water washing (recovering NaCl, KCl and Zn Cl2, etc.), high-temperature roasting (recovering low-boiling point metal zinc and cadmium, etc.), sintering finalresidue and blast furnace smelting to recover and utilize residual metal elements of iron, nickel and manganese, etc.

The invention discloses a method for improving the air permeability of a fully refined powder sintered material layer, relates to the field of steel smelting, in particular to the field of fully refined powder sintered ore. The method comprises the steps that sintering return mines are adopted as granulating balls, are subjected to primary fully refined powder batching mixing, secondary fully refined powder batching mixing, and tertiary fully refined powder batching mixing sequentially, then enter a material loosening device, come out of the material loosening device, and then enter a sintering process. Before being subjected to the primary fully refined powder batching mixing, the sintering return mines are subjected to pre-wetting with atomized water till the water content reaches 4-6%.

The invention relates to a pin, in particular to a grid section pin for a sintering machine trolley. The grid section pin comprises a cylindrical pin body and a square-block shaped briquetting which are connected into a whole, wherein the bottom surface, connected with the pin body, of the briquetting is square-shaped; a compressing pin body is arranged between the pin body and the briquetting; the compressing pin body is round-platform shaped. The grid section pin solves the difficult problem of air leakage caused by thermal expansion of the trolley, reduces energy consumption of an air blower and consumption of the fuel, and improves the productive output of agglomerate.

The invention discloses a low-NOx sintering system based on double-layer ignition of double-layer cloth. The system comprises a sintering machine, and an air bellow is arranged on the lower portion ofeach trolley of the sintering machine; in the advance direction of the trolleys, the sintering machine is sequentially divided into a lower layer sintering mixture cloth segment primary ignition segment, an upper layer sintering mixture cloth segment, a secondary ignition segment, an oxygen-enriched sintering segment and a machine tail segment; a lower layer sintering mixture cloth machine is arranged above the lower layer sintering mixture cloth segment; an upper layer sintering mixture cloth machine is arranged above the upper layer sintering mixture cloth segment; a lower layer sintering mixture ignition system is arranged on the primary ignition segment; an upper layer sintering mixture ignition system is arranged on the secondary ignition segment. The two sets of sintering mixture cloth machines and the two sets of ignition systems are adopted, in this way, generation of NOx is reduced from the source, and the cost for abating smoke pollutants is lowered; the thickness of a sintering material layer is increased, and accordingly the amount of sintering ore is increased.

The invention relates to a method for reducing air leak rate in an iron ore sintering process. The method is characterized in that the method comprises following steps of (1) testing the smoke flow V1 and the SO2 concentration C1 of sintering of a main flue; (2) testing smoke flow V2 and SO2 concentration C2 before a sintering electrostatic dust collector, and testing smoke flow V3 and SO2 concentration C3 after the sintering electrostatic dust collector; (4) testing smoke flow V4 and SO2 concentration C4 before a sintering desulfurization inlet; (5) calculating the air leak rate of each part; and (6) carrying out leak stopping. According to the invention, leak stopping measures are taken according to the calculated air leak rate, so leaked air in the sintering process is greatly reduced, yield and quality of sintered ore are improved, electric energy consumption of a main air exhaust fan is reduced and yield of the sintered ore is increased.

The invention discloses a cold ore screening machine in sintering production, which comprises a screening machine body (8) and screening meshes, wherein the screening meshes comprise a large-gap bar screening mesh (1) and a small-gap bar screening mesh (2), the two screening meshes have the same overall dimensions and are parallel to each other, and the screening mesh structures of the two screening meshes both adopt bars; the bar gap of the large-gap bar screening mesh (1) is greater than that of the small-gap bar screening mesh (1), and the large-gap bar screening mesh (1) is arranged abovethe small-gap bar screening mesh (1). By adopting the technical scheme, the screening efficiency of cold sinter ore is improved, the problem that the screening holes of the single layer screening mesh are easy to block is solved and the yield of the sinter ore is greatly increased.

The invention discloses a thick material layer sintering production method. According to the method, an upper layer sintering mixture and a lower-layer sintering mixed material of a sintering machinecan be sintered at the same time through twice material spreading and twice ignition, so that the thickness of a sintered material layer is improved, the yield of sintered ore is improved, and sintering indexes are improved; after primary material spreading and before secondary ignition, special carbon pellets are placed, so that heat supply and mineralization time of an upper material layer can be increased, the quality of upper-layer sintered ore is improved, and the sintered ore return amount is reduced; and the hypoxia problem of a lower sintered material layer is solved, the lower sintered material layer is fully mineralized, and the quality of lower-layer sintered ore is improved.

The invention discloses a compound sintering method for powdery iron-containing waste mini-pellets, which aims to reduce the environmental pollution of raising dust of powdery iron-containing waste materials and avoid the influence on the sintering quality. The method comprises the steps of: arranging two rows of atomizers in a drum mixer; mixing synthetical powder uniformly through the drum mixer, and performing intensified granulation on the synthetical powder to obtain pellets with the diameters of between 3 and 8mm under the action of a rotary force of the drum mixer; mixing the synthetical powder pellets and coke powder in percentage by weight: 96.5 percent of the synthetical powder pellets and 3.5 percent of the coke powder; distributing the mixture on a belt-type sintering machine after the mixing, adopting a double-sloping girdle ignition furnace, using coke oven gas for ignition at the temperature of 1,050 DEG C, using an exhaust fan at a rate of 4,500m3 / min for air draft, and consolidating to form mini-pellet ore with the diameter of between 3 and 8mm under the condition of the suction negative pressure of 8,500Pa and the sintering temperature of 1,200 DEG C; and adding the mini-pellet ore taken as an iron material into a sintering mixture for secondary sintering consolidation to obtain compound sintered ore.

The invention discloses a revolving furnace sintering ore granulating technology and a sintering machine screening granulating machine for a revolving furnace. The technology comprises the finished sintering ore screening step that finished sintering ore is screened, and the sintering ore with the granulometric class ranging from 5 mm to 11 mm is selected as a blowing cooling agent; the conveying step that when the amount of the screened-out sintering ore is smaller than the number of materials used for the revolving furnace, all the screened-out sintering ore is conveyed to a revolving furnace material surge bunker; when the amount of the screened-out sintering ore is larger than the number of the materials used for the revolving furnace, the redundant screened-out sintering ore is conveyed to a finished product system; According to the sintering machine screening granulating machine for the revolving furnace, a lower screen is of a two-stage screen side-by-side inclined arrangement structure, wherein the size of screen holes of the upper first-stage screen ranges from 7 mm to 5 mm, and the size of screen holes of the lower second-stage screen ranges from 9 mm to 11 mm. The revolving furnace sintering ore granulating technology has the advantages that the sintering ore with the granulometric class ranging from 6 mm to 10 mm is used as the blowing cooling agent for the revolving furnace, the oxidation time in the blowing process is shortened, and the cooling effect is more ideal; the effect of revolving furnace sintering ore granulating technology is better than the effect of large-granulate sintering ore and returning ore in the aspects of accelerating lime dissolution, reducing the furnace slag return drying degree and improving the molten steel yield; the ore returning effect is good, and repeated machining of the sintering ore is reduced.

The invention relates to a capacity increasing improvement system of a sintering machine and a process. The system and process are characterized in that original equipment of the sintering machine is improved, and a smoke circulating system is additionally provided. Therefore, on the condition that a main electric dust remover and a desulphurization system which are matched with an original sintering machine are not modified and the amount of smoke exhausted outside is not increased, the area of the sintering machine is effectively increased, the sintering air volume is increased, sintering negative pressure is improved, and the aim of increasing the yield is achieved.

The invention provides a hot flue gas circulation structure of a sintering machine. According to the hot flue gas circulation structure, a hot air smoke hood is arranged above a running path of a sintering trolley of the sintering machine, a ring cooling flue gas taking pipeline is connected to a ring cooling flue gas port and a ring cooling flue gas conveying pipeline of a ring cooling machine, a ring cooling air blower is arranged on the ring cooling flue gas taking pipeline, the ring cooling flue gas conveying pipeline is connected to a flue gas conveying pipeline, and the flue gas conveying pipeline is connected to the hot air smoke hood. The hot flue gas circulation structure is characterized in that high-temperature section gas taking pipelines and elbows I are arranged and are connected to a large flue of a high-temperature air bellow of the sintering machine and a flue gas conveying pipeline; low-temperature section gas taking pipelines and elbows II are arranged and are connected to an air bellow connecting pipe of the high-temperature air bellow of the sintering machine and the flue gas conveying pipeline; and a sintering machine induced draft fan and a tubular dust collector are arranged on the flue gas conveying pipeline and are positioned among the low-temperature section gas taking pipelines, the elbows and the hot air smoke hood. The hot flue gas circulation structure has the advantages that the sintered ore yield is improved, and the amount of discharged sintering flue gas is decreased.