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 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.

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 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 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 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 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 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 discloses a sintering machine trolley provided with an elastic sealing strip, which belongs to the field of sintering equipment. It includes an upper fence, a lower fence and a trolley body. Elastic sealing strips are respectively provided at the seals between the upper fence and the lower fence and between the lower fence and the trolley body. The sealing strip is a metal graphite sealing strip. The elastic sealing strip is a strip structure formed by curling a layered structure, and the layered structure includes a metal layer and a graphite layer, and the graphite layer is respectively inlaid and pressed on the upper and lower surfaces of the metal layer. Under repeated heat alternating environment, the seal between the upper and lower fences and the seal between the lower fence and the trolley body become irregular due to high temperature. The elastic sealing strip of the present invention has certain elasticity, and its elastic deformation It can supplement the irregular space in the sealing place, thereby greatly improving the sealing performance between the upper and lower fences and between the lower fence and the trolley body.

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 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 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.