44results about How to "Improve clinker quality" patented technology

The invention discloses a micro-expansive moderate-heat Portland cement and a production method thereof. The cement contains micro-expansive moderate-heat Portland cement clinker and gypsum in a weight ratio of 92:8-98:2, and also comprises grinding aid which accounts for 0-0.1 wt% of the sum of micro-expansive moderate-heat Portland cement clinker and gypsum. The raw meal of the micro-expansive moderate-heat Portland cement clinker is prepared from the following raw materials in percentage by weight: 65-80% of calcium raw material, 5-20% of silicon correction raw material, 5-15% of iron correction raw material and 3-10% of magnesium correction raw material. The micro-expansive moderate-heat Portland cement clinker is prepared by the following steps: grinding the raw meal, dehydrating the slurry, drying and crushing the filter cake, and firing to obtain the clinker. By adopting the low-aluminum high-iron high-magnesium low-saturation-ratio formula, the invention effectively controls the hydration heat of cement, displays the micro-expansive property, and can compensate the volume shrinkage in the concrete cooling process, thereby reducing or avoiding cracks.

The invention discloses a soft measurement method of free calcium of cement clinker. The method comprises the following steps: selecting 10 variables as auxiliary variables for clinker fCaO soft measurement according to a cement process, inputting the time sequence, serving as a model, of each variable, and performing normalization processing on the time sequence of each selected variable; according to the characteristic of the time sequence in the cement sintering process, establishing a clinker fCaO soft measurement model based on a multi-variable time sequence convolutional neural network,determining an initial parameter of an MT-CNN model and performing forward-direction training on the network; performing supervised training by utilizing error reverse fine adjustment, optimizing weight w and bias b in the MT-CNN by correcting the error, and predicting the cement clinker fCaO in real time by utilizing the trained MT-CNN model. Calculation of time delay between each variable and the clinker fCaO is avoided and the calculation quantity needed by time sequence matching is reduced; the convergence speed, the precision and the generalization ability of the model are improved; and the fCaO content of the cement clinker can be predicted well, the quality of the cement clinker can be improved and the production energy consumption can be reduced.

The invention relates to a method for sintering an alumina clinker by a drying method. The method comprises that: raw slurry is dried in a drying tower to obtain dry raw materials with the moisture content rate of between 3 and 5 percent, and then the dry raw materials are mixed with kiln dust by weight percentage of 9 : 1-7 : 3 to be sintered in a kiln to obtain qualified clinkers. A sintering device comprises an air heater, a slurry drying device, a dry material silo, a kiln tail hood, a kiln body, a powdered coal silo, a powdered coal screw machine, a dry raw material conveyor, a disc feeding machine, a feed opening and a blower. The slurry drying device is provided with the dry raw material conveyor which delivers dry materials into the dry material silo arranged above the disc feeding machine; the slurry drying device is provided with a hot air pipe which is connected with the air heater and one end of the kiln tail hood respectively; and the other end of the kiln tail hood is positioned in a dry material feeding opening on the tail of the kiln body. The method has the advantages of simple process method, convenient operation, energy conservation and high taste of the sintered clinker and is favorable for stabilizing the thermal regulation of a rotary kiln. The device can effectively improve the productivity and the service life of the rotary kiln, is applicable to industrialized production, can be used for matching with the prior rotary kilns with various models, and can replace the process flow for producing the alumina by the prior sintering method.

The present invention relates to a preparation method of calcium-magnesium clinker. Said method includes the following steps: using magnesite and limestone as raw material, soft burning at 800-100deg.C, cooling, hydration, ball-grinding and wet mixing, filtering, carbonating, drying, forming and calcining at 1600-1900deg.C so as to obtain the invented calcium-magnesium clinker.

The invention discloses an energy-saving and environment-friendly cement clinker preparation system, which includes a raw material preparation system, a raw material homogenization system, a fed raw material conveying system, a cement and pulverized coal preparation system and a cement clinker calcination system, wherein a material outlet of a loading bucket elevator is connected with a material inlet of a raw material homogenization air conveying chute; a material outlet of an unloading chain conveyer is connected with material inlets of two unloading bucket elevators respectively; a material outlet of a raw material feeding spiral conveyer is connected with a material inlet of a preheater; a material outlet of a spiral pneumatic conveying pump is connected with a material inlet of a decomposition furnace; a material outlet of another spiral pneumatic conveying pump is connected with a material inlet of a four-passage pulverized coal combustion device; a hot air outlet of an air-beam type grate cooler is connected with an air inlet of an air-swept coal mill; one material outlet of an electric tee scraper-trough conveyer and a material outlet of a kiln tail dust collection spiral conveyer are both connected with a material inlet of a re-homogenization loading chain conveyer. The system has the advantages as follows: the yield of the clinker is increased, the energy consumption is lowered, the emission is reduced, the quality of the clinker is improved, and the quality of the cement is stable.

The invention discloses a cement raw meal conveying system, which comprises a homogenization silo, two hopper type lifting machines, a raw meal homogenization measuring cabin, a speed regulating and quantitative feeding machine, an impeller feeding machine, a steel wire twisted lifting machine, an electric equal tee valve and a spiral conveyor. The system has the advantages that by adopting a double-hopper lifting machine to lift raw meal, the capability of homogenization is improved, a spiral stirring device and a load sensor are additionally mounted on a raw meal cabin, the phenomena of a full cabin and the blockage of conveying pipelines are eliminated, the homogenization function on the raw meal is improved again, and the homogenization degree of the raw meal is improved; after the system is used, the problem of fluctuation in raw meal ingredients is thoroughly solved, and the quality of ripe meal is greatly promoted; and the overall raw meal conveying system forms a self-circulation system, once material blockage or a fault occurs in a preheater, raw meal in the conveying device can be timely circulated back to the raw meal homogenization silo, and as long as the position of the homogenization silo premits, the raw meal preparation system is not required to be shut down for long due to the fault of the preheater.

The invention relates to high activity cement mineral forming accelerating agent applied to produce new type dry method cement. It is made up of seed crystal activating agent and high calcium carrier, and their proportioning by weight respectively are from one portion to three portion, and from eight portion to twenty four portion. The constituent and weight content of the seed crystal activating agent is from forty percent to eighty percent of the slag, the mineralizing agent is from twenty percent to sixty percent. The main effects of the accelerating agent supplied by the invention are that it obviously appear the seed crystal and mineralizing action, can greatly improve the raw material inflammability, reduce the fire temperature, broaden the fire range, increase the C3S content and activity of the clinker, so that increase the output and quality, as well as save resource and energy source, reduce the environment loading, and possess better economic and social benefit.

The invention discloses a thermal technology for making acid from gypsum. According to the thermal technology, a raw gypsum material which does not contain a reducing agent is dried and dehydrated by a dehydration furnace firstly, the raw material after drying and dehydration is preheated by a multi-level preheater, at least part of the preheated raw material is fed into a prereduction furnace, and the residual part is fed into a rotary kiln; the prereduction furnace reduces 20%-35% calcium sulfate into calcium sulfide, a hot raw material discharged from the prereduction furnace is fed into the rotary kiln, calcium sulfide and calcium sulfate react in the rotary kiln to generate sulfur dioxide and calcium oxide, sulfur dioxide enters an acid making procedure along with flue gas exhausted from the rotary kiln, calcium oxide and other components in the raw gypsum material are calcined into cement clinker in the rotary kiln and then discharged from the kiln, and the cement clinker is cooled and output. The invention further discloses a device for applying the thermal technology. Heat consumption of a gypsum acid-making system is reduced, the use amount of the reducing agent is reduced, the quality of clinker is improved, and the concentration of sulfur dioxide in the acid-making flue gas is increased, so that the investment and operation costs of a flue gas acid-making system are reduced.

The invention relates to a cooling bleaching production technique of white silicate cement clinker, comprising the following steps: discharging calcined high-temperature white silicate cement clinkerfrom a kiln, conveying the clinker into an air heat exchanger for 5-500 seconds of bleaching by wind cooling; delivering the hot air that conducts heat exchange with the high-temperature clinker intoa clinker calcining kiln so as to be used as secondary combustion air; and transferring the clinker bleached by the air heat exchanger into a normal spray-type or soak-type cooling bleaching machine for spray-type or soak-type cooling bleaching until the clinker is cooled down to the temperature of 20-100 DEG C. Compared with the existing production technique, the white silicate cement clinker isbeneficial to decreasing the heat consumption for calcining the clinker, and promoting the sufficient combustion of fuels, thus improving the calcining yield of the kiln; besides, two times of coolingbleaching with different media is beneficial to improving the quality of the white cement clinker.

The invention discloses a high-efficiency process for co-processing shellfish wastes with a cement clinker production line. The process comprises the steps: placing collected shells in a piling shed, rinsing cleanly with water, sending the air-dried shells to a dryer, introducing dedusted hot wind of a kiln tail of a rotary kiln in the cement clinker production line into the dryer, drying the shells, directly discharging emptily deodorization-treated tail gas discharged by the dryer, sending the dried shells into a crusher, crushing, sending the crushed shell broken material as a cement clinker raw material to the cement clinker production line for producing cement clinker or being directly used as a cement raw material. Not only is the shellfish waste utilized, but also energy sources are saved. The invention also discloses a system suitable for the process.

The invention discloses a solid waste treatment device of a cement kiln, which structurally comprises a stepped furnace (5), wherein a solid waste and hazardous waste feed opening (6) is formed in the upper plane of the stepped furnace (5), a tertiary air distribution port (8) is formed in the front side surface of the stepped furnace (5), the rear side surface of the stepped furnace (5) is communicated with a kiln tail decomposing furnace (3), the lower surface of the stepped furnace (5) is in a stepped shape, and the inclined direction of the stepped shape is from the tertiary air distributing port (8) to the kiln tail decomposing furnace (3) and is from high to low. By the adoption of the technical scheme, the solid waste and hazardous waste treatment device is additionally arranged beside the kiln tail decomposing furnace, solid waste and hazardous waste are pre-disposed before entering a firing system, and the influence of the solid waste and hazardous waste on the firing system is reduced; and meanwhile, the disposal capacity of the solid waste and hazardous waste is improved, and recycling, harmless disposal and reduction disposal of the solid waste and hazardous waste are achieved.

The invention discloses a high-efficiency white cement clinker grate cooler. The grate cooler comprises a first material turnover mechanism and a second material turnover mechanism. The first materialturnover mechanism and the second material turnover mechanism are both located in a waste heat recovery area and above a grate plate. The first material turnover mechanism comprises two first coolingrollers. Each first cooling roller is provided with turning blades. The second material turnover mechanism comprises a second cooling roller. The second cooling roller is provided with curved turningblocks. The first cooling rollers and the second cooling roller are all connected with corresponding to rotating driving devices and water supply devices. According to the high-efficiency white cement clinker grate cooler, the first cooling rollers of the first material turnover mechanism can turn over clinkers at the two ends of a grate bed and throw the clinkers to the middle; when the clinkersare continuously pushed to a cooled clinker outlet, so that coarse particles and fine particles in the clinkers are distributed more uniformly on the grate bed, and the Red River phenomenon is avoided; the second cooling roller of the second material turnover mechanism can turn over and stir the clinkers, so that all parts of the clinkers are cooled more uniformly.

The invention relates to the technical field of cement production, in particular to a method for calcining cement clinker by using high-sulfur coal as fuel, by controlling the content of CaF2, ZnO and PbO in fluorite mine mining waste residues and lead-zinc residues and combining the use of raw materials, sulfur in the coal is fixed in the clinker in a calcium sulphoaluminate mineral form to reduce the circulating enrichment of sulfur and relieve the skinning and blockage of a kiln tail system, so that the production efficiency of the cement clinker is improved. The problem that high-sulfur coal (the total sulfur content is about 6%) cannot be used as a main fuel in cement clinker calcination at present is solved, and continuous and normal operation of the kiln system when the high-sulfur coal is used for calcining the clinker is effectively guaranteed. Meanwhile, clinker heat consumption is reduced; the cost pressure caused by purchasing a large number of commercially available sulfur-fixing agents is avoided, the clinker strength can be improved, and the clinker performance is improved.

The invention discloses a sintering technology of cement clinker with directly doped steel slag in a cement sintering system rotary kiln. Steel slag in a molten state in a steel plant is processed by a hot smothering method; steel slag is cooled and cracked into particles; after magnetic screening, most steel is removed; then the steel slag is transported to a cement plant; after going through a buffer chamber, steel slag flows into a feed weigh; according to a preset flow, the steel slag is weighed; then the steel slag is transported to a sintering feed-end chamber platform; the steel slag is fed into a feed-end chamber ramp through dual wind blockage valves; steel slag flows into a rotary kiln, is mixed with other components of raw materials, and moves forward; and the high temperature flame from the coal-injection duct of the kiln head participate in the sintering chemical reactions to generate cement clinker. The target cement clinker comprises the following components: 67.47% of CaO, 22.50% of SiO2, 4.80% of Al2O3, 3.25% of Fe2O3, 2.00% of MgO, 0.5% of SO3, and 1.2% of f-Ca. The production and quality control are performed according to three values (KH, SM, and LM). Through the provided technology, the steel slag can be used as a resource in the cement industry; the grinding medium and electric energy are saved, the output of cement clinker is increased, and the space occupied by the steel slag is reduced.

The invention discloses an air-locking discharging device which mainly solves the problems of air leakage, material blockage and the like in an existing discharging device. The air-locking discharging device comprises a main body, a first discharging roller, a second discharging roller and an adjusting screw rod. The main body is provided with a cavity used for containing materials, the first discharging roller and the second discharging roller are both located in the main body, and the two ends of the first discharging roller and the two ends of the second discharging roller penetrate out of the main body and are further supported by a supporting frame. The second unloading roller is parallel to the first unloading roller. The adjusting screw rod is connected with the supporting frame of the first discharging roller and the supporting frame of the second discharging roller, the distance between two supporting pieces can be adjusted by rotating the adjusting screw rod, and therefore the gap between the first discharging roller and the second discharging roller is adjusted so as to be adapted to the materials with different particle sizes and viscosities. According to the air-locking discharging device provided by the invention, the problem of air leakage is reduced. And continuous and automatic feeding of materials can be achieved, the labor cost is reduced, and the safety and stability of equipment are improved.