57 results about "Separating agent" patented technology

The invention relates to a method for monitoring and / or controlling a CO2 separation apparatus (10) for separating CO2 from a supplied gas flow (14), in particular air flow (14), from the surroundings, in which method the weight and / or expansion of in particular free flowing CO2 separation agents are / is measured, in particular by means of a sensor unit (42), when the CO2 separation process and / or the CO2 release process is carried out, and an information signal and / or control signal are / is output.

This invention provides a method for manufacturing oriented electromagnetic steel sheets that significantly improves manufacturability, and an apparatus for implementing the method. The method for manufacturing oriented electromagnetic steel sheets comprises the following series of steps: hot rolling a steel billet having a specified composition; hot-rolled sheet annealing; cold rolling once or twice with a total reduction rate of 80% or more from the thickness of the obtained hot-rolled sheet to the thickness of the cold-rolled product; recrystallization annealing; coating the steel sheet surface with an annealing separating agent; final product annealing; and planarization annealing for planarization. In this method for manufacturing oriented electromagnetic steel sheets, the grain boundary occupancy of recrystallized carbides in the hot-rolled sheet after annealing and before cold rolling is 80% or more, and the initial reduction during cold rolling is set to a strain rate of 200 / s or less, a reduction rate of 30% or less, and a steel sheet temperature of 90°C or less when biting into the rolls.

The application relates to the technical field of road engineering machinery, in particular to a separating agent spraying device for a rubber-tired road roller and a spraying control method. The device comprises an information acquisition unit, a spraying device and a controller. The controller dynamically determines a target spraying amount and controls the spraying device to execute based on the rubber wheel surface adhesion state information acquired by the information acquisition unit in real time, forming a real-time feedback control closed loop. The controller has a built-in mapping relationship model, and the model is iteratively updated after each spraying according to the state information collected again as effect data, realizing self-learning and continuous optimization of the system. The scheme realizes the leap of separating agent spraying from a fixed mode to dynamic and accurate regulation and control through the construction of an intelligent closed loop of "perception-decision-execution-optimization", solves the problem of material waste; at the same time, by introducing the model online updating mechanism, the system has self-adaptive ability and can continuously optimize the control strategy according to the working conditions, realizing long-term optimal control performance and material utilization.

The invention discloses a silicon nitride ceramic chip and a preparation method thereof, and relates to the technical field of ceramic materials. Comprising the following steps: 1, sequentially adding ceramic powder and a sintering aid serving as solid-phase components into a solvent, adding a binder, uniformly mixing, and carrying out mixing and ball milling to obtain ceramic slurry; step 2, coating the ceramic slurry on a membrane belt for tape casting, and drying to obtain a first green sheet and a second green sheet with different thicknesses; 3, the two faces of the second green body piece are coated with a separating agent, and then the second green body piece and the first green body piece are alternately stacked; sintering in a nitrogen atmosphere, and stripping along a separating agent interface after sintering to obtain a first silicon nitride ceramic chip and a second silicon nitride ceramic chip; the silicon nitride ceramic chips are silicon nitride ceramic chips with different thicknesses; the thickness of the first green body sheet is smaller than or equal to 0.15 mm, and the thickness of the second green body sheet is larger than or equal to 0.20 mm. The silicon nitride ceramic chip prepared by the invention has good cutting yield and preparation yield, and the ceramic chip has good appearance performance.

A method for monitoring and / or controlling a CO2 separation device (10) for separating CO2 from a supplied gas stream (14), in particular an air stream (14) from an environment, is presented, wherein a weight and / or an extent of, in particular, pourable CO2 separation agents is determined during the execution of the CO2 separation process and / or the CO2 release process, in particular by means of a sensor unit (42), and an information signal and / or control signal is / are output.

The application provides a polyimide insulating paint, preparation and application thereof. The polyimide insulating paint comprises a polyimide precursor, a crosslinking agent and a phase separation agent, the polyimide precursor is formed by reaction of aromatic diamine and aromatic dianhydride in an organic solvent, the aromatic dianhydride comprises 3,3',4,4'-diphenyl tetracarboxylic dianhydride with a molar content of 10-30%; the phase separation agent is an organic solvent with a boiling point higher than 170 DEG C, and the content of the crosslinking agent and the phase separation agent is respectively 0.1-10wt% and 10-50wt% of the total mass of aromatic dianhydride and aromatic diamine. The application also provides an electromagnetic wire comprising a conductor and an insulating layer coated on the surface of the conductor, the insulating layer is formed by coating and curing of the polyimide insulating paint of the first aspect. The polyimide insulating paint provided by the application has the advantages of low BPDA content, low cost, resistance to ATF oil water and high PDIV.

The utility model relates to the technical field of asphalt paving, in particular to an asphalt pavement anti-bonding paving tool which comprises a bulldozing rake rod, one end of the bulldozing rake rod is connected with a scraper, and the asphalt pavement anti-bonding paving tool is characterized in that a liquid conveying system is arranged on the bulldozing rake rod and comprises an opening and closing valve, a liquid storage tank and a liquid conveying pipeline, the liquid storage tank is arranged between the opening and closing valve and the liquid conveying pipeline; the liquid storage tank is filled with an asphalt separant and is fixed on the bulldozing rod through an annular fastening buckle, and the annular fastening buckle is welded on the surface of the bulldozing rod; the liquid conveying pipeline is fixed to the surface of the bulldozing rod through an annular ring and extends to the scraper in the length direction of the bulldozing rod, the liquid conveying pipeline is of a Y-shaped structure, the forked position of the liquid conveying pipeline extends in the width direction of the scraper, and a plurality of liquid conveying holes are formed in the portion, on the surface of the scraper, of the liquid conveying pipeline. The problem of scraper adhesion is effectively solved, and the operation efficiency of workers and the utilization rate of the bulldozing rake are improved.

The invention discloses a water-swelling elastic plugging agent for a water-based drilling fluid and a preparation method of the water-swelling elastic plugging agent. The water-swelling elastic plugging agent comprises the following components in parts by weight: 100 parts of a polyolefin elastomer matrix material; 15 to 20 parts of a reinforced matrix material; 0.8 to 1.5 parts of a polyolefin elastomer matrix material cross-linking agent; 8 parts to 15 parts of a reinforcing agent A; 20 to 30 parts of a reinforcing agent B; 15 to 30 parts of super absorbent resin; 15 to 20 parts of a plasticizer; 0.2 to 0.8 part of an isolating agent; 0.5 to 1 part of an anti-aging agent; the plugging agent provided by the invention is simple in preparation process, not only is beneficial to industrial production, but also is convenient to prepare plugging slurry on site, can achieve a good plugging effect, and provides an effective technical means for well leakage treatment.

The utility model relates to the technical field of film processing, and discloses a separant adding device for pasty film processing. Comprising a transmission roller and further comprises a film body arranged on one side of the transmission roller, and guide rollers are connected to the two sides of the lower portion of the film body; according to the utility model, through the arrangement of the feeding assembly, the film body can be soaked in a material by the feeding assembly, so that the film body can be in full contact with a separant, and the laminating roller can extrude the film body coated with the separant, so that the thickness of the separant on the film body is uniform; meanwhile, redundant separant on the film body can be extruded out, the separant is kept to be evenly fed on the film body, the drying assembly is arranged, the film body coated with the separant can be rapidly dried through the drying assembly, therefore, the drying time of the film body can be saved, and then the production and preparation efficiency of the film body is improved.

The present invention relates to a container comprising a fiber-based body made of a first natural organic material and an inner coating of the fiber-based body, wherein the fiber-based body comprises a separation agent for separating the fiber-based body. Furthermore, a device and method for manufacturing such a container are provided.

The utility model relates to the technical field of rubber sheet production, and discloses a powdery rubber sheet separant dipping device. Comprising a box body and further comprises a supporting rod arranged on one side of the box body, the upper portion of the supporting rod is fixedly connected with a first motor, the output end of the first motor is fixedly connected with a lead screw, and the outer portion of the lead screw is connected with a threaded sliding block. The operation is simple and fast, meanwhile, the powder blowing assembly is arranged, the powder blowing assembly can suck the separant in the material box and spray the separant on all the rubber pieces from the upper portion of the box body, when the separant falls into the box body, the air blower can blow away the powdery separant to all the positions of the box body, and therefore the separant can be sprayed on the rubber pieces. Therefore, the separant can be quickly and uniformly attached to each film, so that the working intensity of workers can be reduced, the production efficiency is improved, and the device is suitable for batch processing and use.

The utility model relates to the technical field of rubber films, and particularly discloses a film cooling and isolating agent integrated device which comprises an isolating pool, an immersion cavity is arranged on the inner side of the isolating pool, a plurality of synchronous structures are arranged in the immersion cavity, each synchronous structure comprises a cooling roller, and rotating rollers are symmetrically arranged in the immersion cavity. Sealing bearings are symmetrically arranged on the circumferential surfaces of the two cooling rollers and the circumferential surfaces of the rotating rollers, each cooling roller and each rotating roller are rotationally installed on the isolation pool through the sealing bearings, fixing rings are symmetrically and fixedly installed on the circumferential surfaces of the two rotating rollers, and a plurality of connecting plates are fixedly installed between every two fixing rings. A plurality of fixing blocks are fixedly installed on the outer side of each connecting plate, an ultrasonic generator is fixedly installed on the outer side of each fixing block, the synchronous structure is arranged, and the cooling rollers are arranged in a parallelogram shape, so that when a film is conveyed, the cooling rollers can make full contact with the film, double-face alternate cooling is formed on the film, and the film can be cooled conveniently. The spacer fluid can be fully contacted with the film, and the processing quality is improved.

The invention relates to a construction method of a building surface layer, in particular to a one-time forming construction method of the building surface layer, which comprises the following steps of: tamping and flattening a foundation by using tamping equipment; or constructing a steel pipe for supporting the template, a supporting plate and a bent frame of a square keel to obtain a flat foundation layer or a template layer; after the formwork is corrected, anti-leakage strips are pasted to all the gaps, and a concrete separant is sprayed on the formwork; a concrete surface layer line and a reinforced concrete structure layer line are sequentially marked on the lower portion of the column reinforcement cage from bottom to top; after a layer of concrete is laid, a reinforcing mesh is laid; a reinforced concrete structure layer is obtained after a laser transmitter and a laser leveling machine are used; the concrete pouring thickness is determined through a concrete surface layer line, and the effects of scraping, slurry extraction, compaction and one-time survival can be achieved after all areas are constructed; the column reinforcement cage serves as a floor height reference, the upper reinforcement mesh and the lower reinforcement mesh are connected through the n-shaped reinforcement supports, and one-time forming of the building surface layer is achieved through assistance of the laser transmitter and the laser leveling machine.

This invention discloses a method for manufacturing ultra-thin and ultra-wide 06Ni9DR medium-thick plates for LNG storage tanks. The method includes billet design, sub-bill surface treatment, beveling, preparation of protective separating agent, non-vacuum welding assembly, drilling vent holes, spraying anti-oxidation coating, heating, rolling, cutting and separation, heat treatment, and inspection. The chemical composition of the 06Ni9DR plates is controlled by mass percentage as follows: C≤0.05%, Si≤0.35%, Mn: 0.30%~0.80%, P≤0.005%, S≤0.002%, Ni: 8.50%~10.00%, with the remainder being iron and unavoidable impurities. This invention effectively reduces production costs, improves assembly efficiency, and can be used for mass production. The produced thin and wide 06Ni9DR steel plates fully meet the technical requirements for ultra-large LNG storage tanks in China.

The utility model discloses a separating agent proportioning device for sludge solidification, which comprises a proportioning barrel, an interlayer is welded in an inner cavity at the top of the proportioning barrel, an agent bin for mixing agents is formed between the interlayer and the top of the proportioning barrel, a mixing structure is arranged in the agent bin, and the mixing structure is connected with the proportioning barrel. The top of the proportioning barrel is provided with a chemical adding port for adding chemicals; according to the utility model, the shearing structure is arranged, the shearing plate is linked with the rotating rod through the hollow connecting structure, and the round holes in the edge of the shearing plate are used for physically cutting massive sludge to crush consolidated matters; meanwhile, the stirring paddle in the middle continuously stirs the sludge at a low speed, shearing and stirring are performed simultaneously, mixing is uniform, and the mixing efficiency is improved. The rotating brush plate arranged in the medicament bin is matched with linkage driving of the rotating rod, medicaments can be fully stirred, caking or layering of the medicaments is avoided, the proportioning uniformity is improved, extra driving is not needed, and the space utilization rate of the equipment can be improved.

The application belongs to the technical field of waste battery recycling, and provides a lithium-cobalt-nickel separation agent and a lithium-cobalt-nickel separation method. The lithium-cobalt-nickel separation agent provided by the application comprises a No. 1 separation agent and a No. 2 separation agent. The amino group in the No. 1 separation agent can be complexed with cobalt and nickel ions, so that the cobalt and nickel ions are co-precipitated with the separation agent, thereby separating lithium. The degree of protonation of the organic amine in the No. 2 separation agent is 60-100%, which can reduce the complexing strength of the amino group in the organic amine, so that most of the nickel is dissolved from the cobalt-nickel product, thereby realizing the separation of cobalt and nickel. The separation agent provided by the application only introduces one kind of organic amine to prepare the separation agent, reduces the introduction of impurity ions, reduces the difficulty of wastewater treatment in the later stage, and the separation efficiency of lithium can reach more than 97%, and the recovery rates of cobalt and nickel can reach more than 80% and 92%, respectively.

The utility model discloses a mixed acid separation device which comprises a separation device shell, at least one group of partition plate assembly is fixed in the separation device shell, the partition plate assembly comprises a first partition plate and a second partition plate, the first partition plate and the second partition plate are obliquely arranged, and the oblique directions of the first partition plate and the second partition plate are different; the separation device shell is sequentially divided into a first cavity, a second cavity and a third cavity through the first partition plate and the second partition plate, outlets are formed in the bottom ends of the inclined faces of the first partition plate and the second partition plate correspondingly, and separating agent adding openings are formed in the side walls of the first cavity, the second cavity and the third cavity correspondingly. Each outlet is provided with a control valve, the first cavity, the second cavity and the third cavity are each divided into an upper part and a lower part, and the upper parts and the lower parts are detachably connected through flanges. The acid liquid separator is simple in structure and capable of separating mixed acid liquid.

The invention belongs to the technical field of tire manufacturing, and particularly relates to a stirring system for improving film separant covering uniformity, which comprises an accommodating groove for accommodating a separant, a stirrer for stirring the separant is arranged at the bottom of the accommodating groove, and an ultrasonic oscillator is mounted on the side wall of the groove; a closed-loop circulation pipeline is connected outside the containing groove, a centrifugal pump and a concentration sensor are arranged in the circulation pipeline, an overflow buffer weir is arranged at an inlet of the containing groove, and a slope type guide plate is additionally arranged at an outlet of the containing groove; a defoaming spray head is arranged above the liquid level; a liquid supplementing valve, a concentration sensor and a liquid level meter are also arranged in the accommodating groove; through the structure, the concentration uniformity of the separant is dynamically maintained, and precipitation layering is eliminated; the liquid level can be stabilized, bubbles can be eliminated, and coverage missing is avoided; meanwhile, the concentration and the liquid level can be monitored in real time, and automatic and accurate liquid supplementing is achieved.

The invention discloses an underwater non-dispersible cement slurry system for ocean well cementation based on charge self-attraction and a preparation method thereof.The cement slurry system comprises oil well cement, a lightening agent, a suspending agent, a fluid loss agent, a retarder, a self-separating agent, a defoaming agent and fresh water, is a low-density cement slurry system, has good high viscosity and thixotropy, and can be used for well cementation. The influence of water invasion is avoided; meanwhile, when ocean oil and gas leakage occurs, the charge self-attraction underwater non-dispersion cement paste system can perform a leakage point plugging technology in a seawater environment, and effective strength is rapidly formed. In the prior art, conventional cement paste cannot form a structure and cannot form strength after being poured into the seabed and mixed with seawater; the charge self-attraction underwater non-dispersible cement paste system is not influenced by seawater, can quickly form effective strength after being poured into the seawater, charges among cement particles are adsorbed, the cement structure is not dispersed, and the cement structure can be stacked at a relatively high height, so that oil and gas leakage points of a seabed are blocked, and the ocean is prevented from being further polluted.

The present application relates to a kind of high-efficiency oil sludge separating agent, preparation method and its application in oil sludge cleaning.The high-efficiency oil sludge separating agent includes the following weight parts of component, coconut oil diethanolamide 25-45 parts, sulfonated succinic acid dioctyl ester sodium salt 15-25 parts, sodium dodecyl sulfate 3-10 parts, propylene glycol 1-5 parts, alpha-pinene or limonene 3-10 parts, alpha-terpineol or menthol 3-10 parts, acetyl linaloe 3-8 parts, citral 1-5 parts, water 15-25 parts.The application of the high-efficiency oil sludge separating agent in oil sludge cleaning includes the following steps, S1, oil sludge and agent are loaded into first container;S2, add cleaning water, keep the temperature of mixed solution at 50-70 DEG C, use stirrer to carry out high-speed shearing stirring, stirring speed is above 3000r / min;S3, after stirring, mixed solution is transferred to second container, continue to add cleaning water;S4, continue to stir, stirring speed is above 100r / min.The present application has good oil sludge separation efficiency.

The invention relates to a method for monitoring and / or controlling a CO2 separation apparatus (10) for separating CO2 from a supplied gas flow (14), in particular air flow (14), from the surroundings, in which method the weight and / or expansion of in particular free flowing CO2 separation agents are / is measured, in particular by means of a sensor unit (42), when the CO2 separation process and / or the CO2 release process is carried out, and an information signal and / or control signal are / is output.

A method is proposed for operating a CO2 separation device (10) for separating CO2 from a supplied gas stream (14), in particular an air stream (14) from an environment, comprising at least one chamber (16) for receiving a CO2 separation agent (19) for a CO2 separation process, in particular a sorption process, and a CO2 release process, in particular a desorption process, wherein CO2 released by the release process is cooled and subsequently recirculated back into the chamber (16) to cool the CO2 separation agent (19) for the following CO2 separation process.

The invention discloses an automatic preparation and supply system for a film separant, and the system comprises a centralized preparation unit which is connected with an anti-blocking conveying unit and a concentration feedback adjustment unit, and can achieve the automatic and accurate preparation of the separant; the anti-blocking conveying unit comprises a conveying pipeline and a circulation loop, the conveying pipeline comprises a main conveying pipe, the main conveying pipe is connected to the circulation loop and is a constituent part of the circulation loop, the starting end of the circulation loop is connected with the output port of the preparation tank, and the raw materials are conveyed and returned to the preparation tank after passing through the circulation loop; and the concentration feedback adjustment unit comprises an online monitoring device and an execution device, the online monitoring device monitors the concentration information of each automatic adjustment point in real time and obtains the concentration adjustment information of the separant through a concentration closed-loop control algorithm according to different glue type information, and the execution device executes concentration adjustment according to the concentration adjustment information of the separant. The non-blocking smooth delivery of the separant is realized, the concentration of the separant can be quickly adjusted according to different glue types, and the accurate control of the concentration of the separant is realized.

The utility model discloses an adjustable nozzle structure which comprises a connecting body, an adjustable liquid inlet connector, an adjustable air inlet connector and a rotatable spraying rod, the adjustable liquid inlet connector, the adjustable air inlet connector and the rotatable spraying rod are connected with the connecting body, and a connecting channel communicated with the adjustable liquid inlet connector, the adjustable air inlet connector and the rotatable spraying rod is arranged in the connecting body. The adjustable liquid inlet connector is connected with the container provided with the separating agent, the adjustable air inlet connector is connected with the pneumatic system, when the pneumatic system inputs about 1-8 kilograms of compressed air into the adjustable air inlet connector, the air pressure in the connecting body is increased, and the container provided with the separating agent does not need to be pressurized by a water pump. Liquid can be sucked in from the adjustable liquid inlet connector, mixed and then sprayed out through the rotatable spraying rod, the equipment structure is simplified, and later maintenance of the equipment is facilitated.

The present invention provides an annealing separation agent containing MgO, with a CaO content of 0.10 to 1.00 mass%, a Fe2O3 content of 0.01 to 0.50 mass%, an Al2O3 content of 0.01 to 0.50 mass%, a Cl content of 0.005 to 0.100 mass%, a F content of 0.001 to 0.100 mass%, a Na content of 0.0001 to 0.0100 mass%, a K content of 0.00001 to 0.01000 mass%, a SO3 content of 0.010 to 0.500 mass%, a SiO2 content of 0.01 to 1.00 mass%, and a B content of 0.001 to 1.00 mass%. The present invention provides an annealing separation agent that yields grain-oriented electrical steel sheets with excellent film adhesion.

This invention discloses a novel ultrafine all-metal separating agent and its preparation method, belonging to the field of separating agent technology. The agent comprises, by mass parts: 38-45 parts of an ultrafine nano-core-shell unwrapping component, 22-28 parts of a dual-center targeted coordination trapping component, 12-16 parts of a carbon-sulfur-arsenic tri-redirection inhibition component, 7-11 parts of a stealthy noble metal in-situ activation component, 4-6 parts of a nanoscale dispersed rheological stabilizing component, and 5-7 parts of a weakly alkaline synergistic buffering and enhancing component. The beneficial effects of this invention are: it integrates fracture penetration unwrapping, directional inhibition of harmful components, in-situ activation of stealthy noble metals, coordination trapping of multi-valence metals, and simultaneous fractional separation of multiple minerals into one process. Multiple effects can be achieved with a single addition, significantly simplifying the mineral processing flow. It simultaneously inhibits carbonaceous gold robbery, sulfur oxidation interference, and arsenic toxicity, passivates active sites on impurity surfaces, and improves the stability and selectivity of the mineral processing system.

The invention discloses a lithium ion battery pole piece separation and recovery method and application thereof, and belongs to the technical field of waste lithium battery recovery. The method comprises the following steps: (1) mixing the lithium ion battery pole piece to be separated and recycled with separating agent powder to obtain a mixture, the separating agent powder comprising at least one of LiOH, NaOH and KOH and at least one of LiI, AlBr3 and ZnCl2; (2) heating the mixture obtained in the step (1), keeping heating and performing ultrasonic treatment on the mixture after the separating agent powder is converted into molten salt, so that the current collector of the lithium ion battery pole piece is separated from the active material; and (3) taking out the active material and the current collector in the step (2) from the molten salt, washing the current collector, and washing and filtering the active material to complete separation and recovery of the lithium ion battery pole piece. The separation and recovery method provided by the invention can realize high-efficiency and high-quality separation and recovery of the current collector and the active material on the basis of low cost, low energy consumption and environmental protection.

The present application relates to a kind of paper plastic aluminum packaging waste resource utilization system and method, its system includes water supply unit, material pretreatment unit, reactor, electromagnetic induction heater and three-phase separator, wherein water supply unit is connected with reactor, material pretreatment unit is connected with the feed inlet of reactor, condensing coil is arranged in the interior of reactor and is connected with water supply unit to form cooling water supply circuit, electromagnetic induction heater is arranged in the middle and lower part of reactor;The feed inlet of three-phase separator is connected with the discharge port of reactor.The system uses hydrothermal liquefaction method to process paper plastic aluminum packaging waste, realizes the in-situ online synthesis of high-quality bio-oil, and recycles high-value-added hydrated alumina;While reducing energy consumption and pollution emissions, resource utilization efficiency is significantly improved.The present application is green and environmentally friendly, avoids the use of organic solvents or high-acidity separating agent in traditional recycling methods, reduces secondary pollution;By-product hydrogen can be used as clean energy, and carbon emissions are reduced.

The application relates to the technical field of biomedical engineering industry, and discloses a circulating feeding demolding separating agent smearing equipment for false tooth processing, which comprises a shell, a working cavity formed in the inner side of the shell, a diaphragm pump, a spraying assembly and a positioning assembly. The shell is internally formed with a closed working cavity, the diaphragm pump is fixedly assembled on the outer side wall of the shell, the spraying assembly is vertically installed on the top of the working cavity, the positioning assembly is fixedly installed in the working cavity, and the positioning assembly is arranged below the spraying assembly. The circulating feeding demolding separating agent smearing equipment for false tooth processing is characterized in that the separating agent falling back after spraying is returned along the return water end of the circulating conveying pipeline, flows through the pipeline filter arranged in series, the pipeline filter can intercept and filter the solidified debris, dust impurities and particle precipitates in the circulating liquid in real time, the return demolding agent can be continuously purified, and impurities can be prevented from entering the nozzle to cause blockage and poor atomization.

To provide a method for producing a directional electromagnetic steel sheet having excellent film adhesion and magnetic characteristics, and a directional electromagnetic steel sheet, and an annealing separation agent.SOLUTION: There is provided a method for producing a directional electromagnetic steel sheet, including the steps of: heating a slab comprising a predetermined component composition and a remainder made up by Fe and an impurity to 1280°C or higher and then subjecting the heated slab to a hot-rolling procedure to produce a hot-rolled steel sheet; subjecting the hot-rolled steel sheet to a hot-rolled sheet annealing procedure and then subjecting the resultant product to one round of cold rolling procedure or two or more rounds of cold-rolling procedures including intermediate annealing to produce a cold-rolled steel sheet; decarburization-annealing the resultant steel sheet; applying an annealing separation agent whose main component is MgO containing a Ti compound, a rare earth metal compound, a B compound, and a predetermined compound onto a surface of the decarburization-annealed cold-rolled steel sheet and then subjecting the resultant steel sheet to a final annealing procedure; and applying an insulation coating film onto the final annealed steel sheet and then subjecting the resultant steel sheet to a flattening annealing procedure.SELECTED DRAWING: Figure 1