23 results about "Cement manufacturing" patented technology

The application relates to the technical field of cement manufacturing, and discloses a grinding system which comprises a roller pressing system, a vertical mill system and a ball mill system, the discharge port of the roller pressing system and the discharge port of the vertical mill system are both connected to the feed port of the ball mill system; the roller pressing system is used for grinding first material, and the vertical mill system is used for grinding second material; the ball mill system is used for receiving the ground first material and the ground second material, and mixing the ground first material and the ground second material to obtain required third material; wherein the roller pressing system is further used for distributing a part of the ground first material to the ball mill system and returning another part of the ground first material to the roller pressing system for regrinding; and / or the vertical mill system is further used for distributing a part of the ground second material to the ball mill system and returning another part of the ground second material to the vertical mill system for regrinding, so that the appearance grading of the third material can be improved, and the energy consumption of the grinding system can be reduced.

A combustion method using a fuel combustion device, a cement manufacturing method, and a cement calcination facility including a fuel combustion device, in which while the amount of a fossil fuel used as a fuel supplied to a fuel combustion device provided in various facilities such as a cement calcination facility is reduced, the radiation heat transfer amounts of various burners are maintained, whereby the amount of heat transferred to a heating target such as a powder raw material of cement clinker is maintained to maintain a state suitable for calcination, the amount of carbon dioxide emitted from the various facilities is reduced, and the various facilities can be operated at a low cost, and a fuel combustion device including a fuel supply mechanism having a mechanism that supplies a flammable powder, a mechanism that supplies a fuel gas, and a mechanism that supplies a non-flammable powder are used.

The present invention concerns an industrial chemical process (400f) and an apparatus for carrying out that process. The chemical process integrates into a single, combined method: (i) a method (303, 304) of producing iron and / or manganese from their ores, and (ii) a method (205a, 205b, 207, 208, 209) of producing an oxide or hydroxide of at least one of calcium, magnesium and iron from another ore respectively comprising a carbonate mineral of at least one of calcium, magnesium and iron. This combined method has the iron and / or manganese ore and the other ore comprising the carbonate mineral as its only essential ingredients, with common salt and / or water as optional extra ingredients. The combined method produces iron and / or manganese in elemental form, an oxide or hydroxide derived from the carbonate mineral, and oxygen as its corresponding products. If the iron and / or manganese ore also comprises a siliceous mineral, the method may also produce an alkaline mixture comprising sodium silicate as a co-product. Salt and water act as intermediaries to produce these end-products, but are only consumed if supplied in excess. An amount of sodium oxide, hydroxide and / or carbonate determined by the amount of salt consumed may be produced as a co-product, along with a corresponding amount of at least one of chlorine and hydrochloric acid. An amount of hydrogen determined by the amount of water consumed may also be produced as a co-product, along with an increased amount of oxygen. The iron, manganese and oxygen produced may all be used in steelmaking. Any excess oxygen may be safely vented to atmosphere. The oxide or hydroxide derived from the carbonate mineral may be used in cement manufacture, as a flux in steelmaking and / or as an ingredient in the manufacture of soda-lime glass. The alkaline mixture comprising sodium silicate may be used as an alkaline activator for an alkaline activated or geopolymer cement. The sodium carbonate may be used in the manufacture of soda-lime and / or borosilicate glass, for example. The chlorine and / or hydrochloric acid may be used in the manufacture of chlorinated organic compounds, for example. The hydrogen may be used as a fuel in a hydrogen economy. The method of the invention requires no nett input of heat because the chemical reactions it involves are exothermic overall. It also consumes no fossil fuels and has electricity as its only energy requirement. Thus if the electricity is produced from a source of renewable energy, this method produces no greenhouse gas emissions. In some embodiments, the method can even have a negative carbon footprint overall. The invention is intended to replace existing techniques for producing iron and / or manganese from their ores, including hydrogen-DRI, the calcination of limestone and other carbonate minerals, both in cement manufacture and in the production of lime for other purposes, and the ammonia-soda, or Solvay, process for the production of sodium carbonate. The invention therefore has the potential to eliminate up to about 20% of anthropogenic carbon dioxide emissions. [Fig. 9B]

The disclosure relates to the technical field of cement manufacturing, and specifically relates to a calcination system and method for low-carbon cement clinker. The calcination system includes: a kaolin calcination assembly including a preheater and a decomposition furnace, where the preheater is provided with a multi-stage cyclone cylinder; the preheater is provided with a feed port and a discharge port; the decomposition furnace is provided with a fuel adding port and a raw material inlet; the raw material inlet is connected to the discharge port; activated kaolin is generated by the decomposition furnace through calcination; and the decomposition furnace has a calcination temperature of 700° C. to 850° C. and calcination time of 0 h to 1.5 h, and a calcination atmosphere in the decomposition furnace is an oxygen-enriched atmosphere or a CO reducing atmosphere; and a cement calcination assembly configured to generate cement clinker through calcination, where the activated kaolin is added to a discharge side of the cement calcination assembly according to a predetermined ratio of the activated kaolin to the cement clinker. Use of carbon-containing raw materials in clinker production and carbon emissions of clinker are reduced, and a hydration rate of the cement clinker is adjusted.

The application discloses a cement cooling device. The cement cooling device comprises a shell, a crushing part capable of crushing materials into fine fragments, a cold air part connected with the shell below the crushing part, and a scattering part arranged below the crushing part. The materials enter the crushing part through a feeding port, and the fine fragments of the materials fall directly into the space below the crushing part due to gravity after being crushed by the crushing part. The fine fragments of the materials are scattered by the scattering part and contacted with the cold air blown by the cold air part, so that the fine fragments of the materials generate turbulent flow in the shell, the contact time of the materials and the cold air is prolonged, and the temperature of the materials is reduced. Meanwhile, the particle size of the materials is reduced and the contact area of the materials and the cold air is increased due to the crushing and scattering of the materials, which is beneficial to the cooling of the materials, guarantees the final cooling temperature of the materials, and improves the quality of the cooled materials. In addition, the application further discloses a cement manufacturing system, a cement cooling method and a manufacturing method.

The present disclosure teaches a method and system of optimizing fuel consumption in a cement manufacturing kiln. The method comprises determining one or more boundary ranges for one or more operational parameters of a plurality of operational parameters. Further, the method comprises determining that the one or more operational parameters, is outside of the one or more boundary ranges determined for the one or more operational parameters. The method further comprises predicting a fuel consumption of the cement manufacturing kiln during a time period during which the one or more operational parameters is outside of the one or more boundary ranges. The method further comprises generating a control signal based on the determination that the one or more operational parameters, is outside of the one or more boundary ranges, wherein the control signal is configured to optimize the fuel consumption of the cement manufacturing kiln.

The utility model relates to cement manufacturing technical field, concretely relates to a bulk cement loading device, including support frame, steel sheet storehouse, support plate, drainage main pipe and drainage branch pipe, the number of steel sheet storehouse is three, three steel sheet storehouse is fixedly connected with support frame respectively, and is passed through support frame respectively, support plate is fixedly connected with support frame, and is located the middle of support frame, the number of drainage main pipe is a plurality, a plurality of drainage main pipe is fixedly connected with support plate respectively, and is passed through support plate respectively, the number of drainage branch pipe is two, two drainage branch pipes are fixedly connected with the steel sheet storehouse in the middle respectively, and are located the top of drainage main pipe respectively, solved the problem that the cement management variety increases, leads to the problem that the shipment channel is short of and influences shipment efficiency.

To provide a method and equipment for effectively utilizing exhaust gas from cement manufacturing equipment.SOLUTION: The method for utilizing the cement exhaust gas comprises a step (a step) of adding nitric acids to CaCO3 and reacting them to form carbon dioxide and a Ca (NO3) 2 aqueous solution and recovering the carbon dioxide, and a step (b step) of heating and dehydrating the Ca (NO3) 2 aqueous solution. A step (b step) of generating CaO and NOx and discharging the NOx to the outside of the system, a step (c step) of adding H2O to CaO and reacting them to prepare Ca (OH) 2, and a step (d step) of bringing cement exhaust gas into contact with Ca (OH) 2 and reacting it with carbon dioxide in the Ca (OH) 2 exhaust gas; The method includes a step (d step) of preparing CaCO3 and circulating and using the CaCO3 as the CaCO3 in the step (a), and a step (e step) of bringing NOx produced in the step (b) into contact with water to prepare nitrate and circulating and using the nitrate as the nitrate in the step (a).SELECTED DRAWING: Figure 1

The present disclosure relates to a system and method of carbon-neutral cement production, which can be achieved by incorporating an electro-synthesizer system, an acid leaching system, and an alkalinization / precipitation system into the cement manufacturing process. The system and method enables the robust processing of various serpentine-containing materials, while mitigating emissions associated with cement production. The Mg cement produced can be incorporated into building materials.

The utility model relates to the technical field of cement manufacturing, and provides a powder concentrator of a roller press of a cement grinding mill. The inner grinding cylinder is arranged in the shell, and a fine powder outlet is formed in one end of the inner grinding cylinder; the two cement particle inlets are formed in the surfaces of the symmetrical positions of the inner grinding cylinder, and limiting grooves are formed in the symmetrical positions of the inner wall of the inner grinding cylinder; and the hydraulic cylinder is fixedly arranged on the inner wall of the inner grinding cylinder. According to the cement raw material grinding device, materials are put into the inner grinding cylinder through the raw material putting pipe, the driving motor is started to work, the grinding roller is driven to rotate and is matched with the grinding part on the inner wall to grind the cement raw materials, and when the ground granularity cannot meet the requirement, the hydraulic cylinder is started to work, the output end mounting frame is driven to move along the limiting groove, and the cement raw materials are ground. And a driving motor on the surface of the mounting frame is driven to move upwards to be better attached to the grinding part, finer grinding is completed, and therefore the applicability of the device is improved.

The utility model discloses a dust collection device for a cement manufacturing production line, which comprises a first supporting seat, a second supporting seat and a first suction assembly for sucking waste raised dust and available raised dust, and further comprises a mounting box, a recycling box, a cleaning assembly, a second suction assembly and a third suction assembly, the outer wall of the mounting box is fixedly connected with the first suction assembly, a net partition plate is arranged in the mounting box, so that a first inner cavity and a second inner cavity are formed in the mounting box, and the first inner cavity communicates with the first suction assembly; the first supporting seat and the second supporting seat are fixed to the recycling box, a filtering assembly is arranged in the recycling box, so that a plurality of recycling cavities are formed in the recycling box, and the recycling cavities communicate with the first inner cavity; the cleaning assembly is arranged on the recycling box and used for removing waste flying dust. The second suction assembly is arranged on the cleaning assembly, communicates with the second inner cavity and the cleaning assembly and is used for sucking the waste poplar dust into the cleaning assembly.

The present invention provides a method for recycling waste from a cement manufacturing process and effectively utilizing the waste, and a useful system for implementing the method, which effectively utilizes calcium carbonate generated using waste from a cement manufacturing process and hydrochloric acid generated in the middle of the process for the production of vinyl chloride resin and the like. A recycling method of waste generated from a cement manufacturing process, wherein an aqueous solution containing potassium chloride obtained by water washing of chlorine bypass dust generated from a cement manufacturing process is subjected to electrodialysis treatment to generate hydrochloric acid water and an aqueous solution containing potassium hydroxide, a part of the hydrochloric acid water is added to calcium-containing waste to generate an aqueous solution containing calcium ions, the pH of the aqueous solution containing calcium ions is adjusted and impurities are separated, carbon dioxide from a cement manufacturing process is contacted with the aqueous solution containing potassium hydroxide obtained by the electrodialysis treatment to generate an aqueous solution containing potassium carbonate, the aqueous solution containing calcium ions after the separation process and the potassium carbonate are used to generate calcium carbonate and an aqueous solution containing potassium chloride, and a part of the hydrochloric acid water obtained by the electrodialysis or the generated calcium carbonate is used for the production of vinyl chloride resin and the like.

Method of producing a pozzolanic material in a cement manufacturing plant, comprising: - providing a silico-aluminous mineral material susceptible of pozzolanic reactivity upon calcination, - introducing the silico-aluminous mineral material into the rotary kiln via the kiln feed installation without having been thermally treated in the combustion chamber and calcining the silico-aluminous mineral material in the rotary kiln at a temperature of 400-900°C, preferably 600-900°C, in order to obtain said pozzolanic material, combusting a non-fossil, alternative fuel by means of the main burner for providing thermal energy to the calcination process, - guiding the combustion gas from the kiln inlet chamber into the combustion chamber and combusting a fuel in the combustion chamber, thereby raising the temperature of the combustion gas to an elevated temperature of above 850°C and keeping the combustion gas at said elevated temperature for at least 2 seconds.

To improve manufacturing efficiency.SOLUTION: A crushing apparatus includes: a drum which stores a plurality of crushing balls, and is rotatable around a predetermined axis line; a driving part for rotating the drum around the axis line; a partition part which is arranged so as to partition a first region and a second region aligned in an axial direction at which the axis line extends in a space in the drum, and permits passage of powder to the second region from the first region; a supply part for supplying a crushing object including a cement clinker to the first region; and a discharge part for discharging a cooling liquid to the first region from one end in the axial direction of the drum. The discharge part is configured so as to discharge a plurality of droplets having an average particle diameter of 100 μm to 1,000 μm to the first region.SELECTED DRAWING: Figure 1

The utility model relates to cement manufacturing technical field, concretely is a kind of cement clinker high temperature denitration device, including connecting shell, upper casing and lower casing, the inside of connecting shell is provided with cleaning assembly, the cleaning assembly includes the cleaning plate of the inside fixed connection of connecting shell, the side wall of connecting shell is fixedly connected with gear ring, the top and bottom of connecting shell are all fixedly connected with limit ring, by cleaning assembly reaches the cleaning of first filter plate when carrying out denitration reaction each time, the cooperation setting of motor, gear, gear ring, connecting shell, first filter plate and cleaning plate has realized the guarantee in long time denitration reaction, guarantee the filtering function of first filter plate, can make kiln tail flue gas pass smoothly, ensure and ammonia gas fully mix, this makes denitration reaction can be carried out under good condition, so that more nitrogen oxides can react under the action of catalyst with ammonia gas, to significantly improve denitration efficiency.

This utility model relates to the field of cement manufacturing technology, and in particular to an environmentally friendly high-strength cement manufacturing equipment with anti-caking function. It includes a housing, on the surface of which a stirring mechanism is installed. The stirring mechanism includes a motor, the motor shaft of which passes through the inner cavity of the housing and is fixedly connected to a vertical rod. A vertical tube is fitted onto the bottom of the vertical rod, and a stirring plate is fixedly connected to the surface of the vertical tube. A first scraper is fixedly connected to the side of the stirring plate away from the vertical tube, and a second scraper is fixedly connected to the bottom of the stirring plate via a support plate. A connecting plate is fitted onto the top of the surface of the vertical tube. This utility model can scrape and stir materials adhering to the inner wall of the housing, preventing materials from adhering to the inner wall of the housing for a long time and solidifying. It can also drive the stirring plate to move vertically, adjusting the height of the stirring plate to facilitate stirring and mixing materials in different locations, ensuring thorough mixing and improving cement processing efficiency.

This invention discloses a method for preparing and applying a molybdenum-modified cerium-based low-temperature NH3-SCR catalyst, belonging to the field of air pollution control. The catalyst uses Ce(NO3)3·6H2O, 50wt% Mn(NO3)3, and (NH4)6Mo7O as its components. 24 ·4H2O is used as a precursor, which is obtained by washing, drying and calcination. Its general chemical formula is Ce2Mn1Mo. x O y The preparation method includes four steps: precursor synthesis, hydrothermal reaction, washing and drying, and calcination at 500℃. The process is simple. This catalyst can produce NO at 100-200℃. x With a conversion rate of >90%, strong sulfur resistance, and efficient removal of nitrogen oxides (NOx) generated in industrial processes such as steel smelting and cement manufacturing. x ).

The utility model relates to cement manufacturing waste heat recovery equipment, which relates to the technical field of cement manufacturing, and comprises a water tank, a water inlet pipe, a water outlet pipe, a flue gas pipeline arranged in the water tank, and a first partition plate, a second partition plate and a turbulent flow assembly which are arranged in the water tank, the water inlet pipe and the water outlet pipe are arranged on the two opposite sides of the water tank respectively, the water inlet pipe is connected with a water pump, one end of the first partition plate is connected with the bottom of the water tank, and a gap is formed between the other end of the first partition plate and the top of the water tank. The first partition plate and the second partition plate are distributed in the water tank at intervals, the flue gas pipeline is distributed between the first partition plate and the second partition plate in a snake shape, and the turbulent flow assembly is used for stirring water in the water tank. Heat of high-temperature flue gas is absorbed through water in the water tank, the heat exchange efficiency is high, energy waste is effectively reduced, and the heat recovery efficiency is improved.

The utility model relates to cement manufacturing technical field, concretely is a kind of three sealing devices of feeder shaft, including sealing matrix, the sealing matrix is by front end guide part, integrated intermediate part and rear end reinforcing part constitute, the front end guide part and integrated intermediate part are integrated structure, the rear end reinforcing part is installed in the rear end of integrated intermediate part by fixed bolt, and the front end of the front end guide part is equipped with first sealing stop mouth part, the space inside integrated intermediate part forms second grease sealing cavity, the part of rear end reinforcing part that extends into integrated intermediate part rear end interior forms third packing seal. This three sealing devices of feeder shaft effectively improves sealing performance and durability, reduces material leakage and maintenance frequency, significantly improves working environment, and ensures the continuity of production and high efficiency operation, while reducing manpower and time cost.

To efficiently reduce NOx in exhaust gases from cement manufacturing facilities. [Solution] A cement manufacturing facility comprising a raw material mill for crushing cement raw materials, a preheater for preheating the cement raw materials crushed in the raw material mill, a rotary kiln for heating the cement raw materials, a riser duct connecting the preheater and the rotary kiln, a dust collector installed downstream of the raw material mill, and an exhaust gas outlet for releasing exhaust gas that has passed through the dust collector, wherein a method for producing cement clinker by heating cement raw materials in a rotary kiln is provided, comprising a denitrification material supply device for supplying denitrification material to the riser duct, and a detector for detecting NOx and O2 concentrations in the exhaust gas from the preheater before the raw material mill, predicting the NOx value at the exhaust gas outlet converted to O2 10% from the NOx and O2 concentration detected by the detector, and controlling the amount of denitrification material supplied to the riser duct according to the predicted value.

This device reliably detects blockages in electrostatic precipitators with a simple design, enabling smooth exhaust gas processing. [Solution] An electrostatic precipitator having an electrostatic precipitator body connected to an exhaust gas passage and a hopper installed at the bottom of the electrostatic precipitator body, the device for detecting blockage in the hopper comprises a detection tube installed in the hopper, a blower that supplies gas to the detection tube, a branch tube branched from the detection tube with its tip pointed upward, a floating body provided at the tip of the branch tube that rises due to the pressure inside the branch tube, a detection switch activated by the floating body, and a blockage alarm that notifies the operation of the detection switch.

The invention provides a control method and system of a grate cooler for a cement kiln, and relates to the technical field of cement manufacturing. The control method of the grate cooler for the cement kiln comprises the following steps that S1, data are collected in real time based on a plurality of sensors arranged on the grate cooler; s2, the cooling air volume and the material conveying speed of the grate cooler are adjusted according to the collected data, so that the stability of the internal environment of the grate cooler is kept; and S3, parameters of the cooling air volume and the material conveying speed are dynamically optimized through a feedback adjusting mechanism, so that the cooling efficiency is improved. Through integration of various sensors and an intelligent control technology, accurate monitoring and regulation of operation parameters of the grate cooler are realized, parameters of cooling air quantity and material conveying speed can be dynamically optimized through a feedback regulation mechanism according to change conditions of temperature, pressure and material position monitored in real time, and the cooling efficiency is improved. Not only is the cooling efficiency in the cement production process improved, but also technical support is provided for realizing a more environment-friendly and energy-saving production mode.

The invention relates to the technical field of cement manufacturing, in particular to a method for preparing cement clinker from copper slag tailings and the cement clinker, and the method comprises the following steps: step 1, proportioning: mixing copper smelting slag recleaning tailings, limestone and sandstone according to a certain proportion; step 2, raw material preparation: grinding the raw materials mixed in the step 1 to specified fineness to prepare a raw material; step 3, homogenizing: fully homogenizing the raw material; step 4, calcining: calcining the raw material obtained in the step 3 at the sintering temperature of 1300-1350 DEG C, and keeping the constant temperature for 30-60 minutes; and 5, rapidly cooling the calcined clinker, and discharging to obtain the target high-iron-phase cement clinker. Through process improvement, the cement clinker is prepared from copper smelting slag recleaning tailings, high-added-value resource utilization of a large amount of industrial solid waste is achieved, and the obtained cement clinker takes high-strength tricalcium silicate and high-corrosion-resistance tetra calcium aluminoferrite as main minerals and has the characteristics of high strength, good corrosion resistance, low hydration heat and the like.