142results about How to "Advanced and reasonable technology" patented technology

The invention relates to a method for extracting platinum, rhodium and palladium from a failed platinum alloy gauze, which comprises the following steps of: separating to extract precious metals such as the platinum, the rhodium and the palladium from the failed platinum alloy gauze; dissolving through hydrochloric acid and nitric acid; removing nitro group, transforming sodium and leaching; obtaining platinum, rhodium and palladium complexing solution; adopting an ammonium chloride precipitation method to separate the platinum; adopting a sodium nitrite complexometry to separate the palladium and the rhodium; adopting a six nitroso rhodium acid ammonium method to purify the rhodium; adopting a dichlorodiamminopalladium method to purify the palladium; carrying out reduction to obtain spongy platinum, spongy palladium and rhodium powder through adding hydrazine hydrate; vacuum drying and roasting; and purifying again. The extracting method has advanced and reasonable process, and accurate and detailed parameters; the purity of the extracted spongy platinum, spongy palladium and rhodium powder is great than 99.9 percent, and the quality is stable; and the method is a very ideal method for extracting the precious metals such as the platinum, the rhodium and the palladium from the failed platinum alloy gauze.

The invention relates to a method for preparing an aluminum-based boron carbide neutron absorption board. According to a requirement on nuclear device protection, the compact aluminum-based boron carbide neutron absorption board is formed by mixing aluminum powder, boron carbide powder, silicon powder, titanium powder and boracic acid crystal, performing powder metallurgy to make a rectangular board, and performing hot extrusion molding on the rectangular board on a pressing machine in a die in a heating state; the compound neutron absorption board is grey white; the neutron absorption rate is more than or equal to 90 percent, the boron carbide is distributed uniformly, and particles and a base body are tightly combined together; the micro hardness of the base body is up to 185.8HV and the micro hardness of the particles is up to 2,022.2HV; a corrosion resistance level on the surface of the board is -0.45 voltage, the anti-bending angle is more than or equal to 10 degrees, the tensilestrength is more than or equal to 200 MPa, the fracture elongation rate is 1.8 percent and the fracture contractibility rate is more than or equal to 1.0 percent. The preparation method is advanced and rational in process, and is full and accurate in parameter; and the preparation method is an ideal method for preparing the aluminum-based boron carbide neutron absorption board.

The invention discloses a system for predicting the fatigue limit of a magnesium alloy member based on infrared thermal imaging, and a method thereof. The system comprises: fatigue tester jigs (1); a fatigue test piece (2) comprising a magnesium alloy base material and a welded joint test piece; a fatigue test control system (3); a fatigue test system (4) used for the fatigue test of the magnesium alloy base material and the welded joint test piece to obtain a magnesium alloy fatigue limit under a cycle frequency of 10<7 >; an infrared temperature measurement system (8) for obtaining the surface temperature change curve of the fatigue test piece (2) in the fatigue test process and recording the temperature change data of the fatigue test piece (2) in the fatigue process; and a comprehensive analysis system (5) applying origin software to compare the obtained magnesium alloy fatigue limit with a fatigue limit obtained through routine fatigue tests in order to judge the measurement accuracy. The system and the method can be used for estimating the dangerous point and the fatigue limit of a welding structure in service.

The invention relates to a method for purifying N-methylpyrrolidone, which is a method for producing a heterocyclic compound. The method comprises the following steps: adding a water repellent agent accounting for 0.1 to 2 percent of a crude product into crude product solution, and then continuously throwing the mixture into a three-tower combined rectifying system. By adopting good-quality stuffing and three-tower continuous pressure reduced rectification, adopting an advanced rectifying operation method according to the optimal principle of reflux separation effect, and adopting a reflux ratio of 1.5 to 3 to extract a product, the method effectively controls the contents of impurities such as metal ions and the like.

The invention relates to a method for predicting thefatigue limit of a magnesium alloy component, and belongs to the technical field of magnesium alloy material mechanical properties. The method is characterized by comprising the following steps: by aiming at a deformation process of magnesium alloy under action of a cyclic load, obtaining an average cyclic strain curve along with a regular change of strain since a magnesium alloy sample can generate irreversible deformation under higher cyclic stress; through analyzing a linear relation between an average cyclic strain curve stabilization value and the cyclic load, determining an intersection point of two straight lines, and thus obtaining the fatigue limit of the magnesium alloy. The method does no need experimenters to observe the sample all the time, and has the advantages of convenience, quickness, accuracy and the like.

The invention discloses a disposing method to supply aluminum sulfate slag as cement dosage, which comprises the following steps: mixing aluminum sulfate slag and acetylene gas slag and coal ash as finite ratio; producing blank independently; disposing mature blank block with high-temperature roasting steps; grinding into powder separately; using to cement or concrete; or grinding mature blank block and cement clinker to cement. This invention is a good disposing method, which can improve the antiwear property of cement markedly.

The invention discloses an assoeted sweet potato agar-agar jelly and a preparation method thereof. The assoeted sweet potato agar-agar jelly is mainly characterized in that an agar-agar jelly body (1) of the assoeted sweet potato agar-agar jelly contains one or more than one food and/or subsidiary foodstuff (2), and the blocky or sheet or bar-shaped agar-agar jelly body (1) is sterilized and packaged in a packing bag (3). The preparation method of the assoeted sweet potato agar-agar jelly takes sweet potato starch as a main material, and is mainly characterized in that the sweet potato starch is performed according to eight steps: stirring, heating, adding of auxiliary material food and/or the subsidiary foodstuff, plate loading, steaming, cooling, cutting, and packing. The assoeted sweet potato agar-agar jelly has the characteristics of good taste, high edible value, good sanitary conditions, convenient storage and transportation, long quality guarantee period and so on. The preparation method of the assoeted sweet potato agar-agar jelly has the characteristics of reasonable and advanced process, high production efficiency, capability of ensuring the quality of a finished product of the assoeted sweet potato agar-agar jelly and so on. The invention develops a novel finished product and provides a novel preparation method for a traditional food sweet potato agar-agar jelly in our country.

The invention relates to a method for producing low-temperature cement clinker from straw ash, which mainly comprises the following steps of: feed preparation, burdening, pelletizing, steam curing, low-temperature calcining, grinding and the like. Cement of the low-temperature cement clinker, which can be comparable to the cement of Portland cement clinker, is produced by taking dry and wet strawash as a main raw material and steel slag and aluminum slag as auxiliary materials, and the cement of the low-temperature cement clinker has various characteristics of high cement strength, high concrete compatibility, good abrasion resistance, low hydration heat, minimum inflation, freezing resistance, corrosion resistance and the like. The low-temperature cement clinker can be directly used forengineering construction of dams, underwater constructions, roads, bridges, civil constructions and the like. The method for producing the low-temperature cement clinker from the straw ash also has the advantages of simple and reasonable process, low energy consumption, high benefit, investment saving, no secondary pollution, environmental protection and the like. Compared with regular cement produced by traditional methods, the investment is saved by 80 percent, the cement cost is reduced by 60 percent, the energy consumption is reduced by 80 percent, the carbon dioxide emission is reduced by 80 percent, the straw ash and other industrial waste residues can be largely digested, and the environmental pollution is reduced. The method for producing the low-temperature cement clinker from the straw ash is a good method which is favor of protecting environment and is capable of turning waste into wealth.

The invention relates to a preparation method of industrial waste residue mixed ore powder, which mainly comprises the following steps: proportionally mixing and forming waste alkali residue discharged after producing industrial crystal soda in salinization plants, waste steel residue discharged by steel plants, waste residue straw ash discharged by straw power plants and waste residue titanium gypsum discharged by titanium white plants, drying at 250 DEG C, and the like. The method can change piled unmanageable alkali residue (which pollutes the underground water resources) and other industrial waste residues into valuable substances to obtain the industrial waste residue mixed ore powder product which can completely substitute the resources-short price-increasing slag powder. Various properties of the produced mixed ore powder product can achieve or exceed quality indexes for slag powder, and thus, the mixed ore powder product is a high-quality concrete admixture; the maximum doping amount of the mixed ore powder product in the concrete is up to 50%, and thus, the method can change wastes into valuable substances and perform harmless and decrement treatment on the industrial waste residues; and the method has the advantages of advanced and reasonable technique, low investment, low cost, high benefit, no pollution or waste residue emission in the production process, and the like.

A method for preparing pentaerythrite oleic ester used in cold-rolling oil belongs to the technical field of ester compound synthesis in organic chemistry. Pentaerythrite and oleinic acid are adopted as raw materials and p-toluenesulfonic acid or/and tributyl phosphate is/are adopted as catalyst; toluene or benzol is adopted as a water carrier, and esterification reaction lasting 4 to 6 hours is performed under the protection of high-purity nitrogen and under the temperature of 140 to 180 DEG C; after the reaction, continuous vacuumization lasting 40 to 60 mins is performed under the high-vacuum condition with a vacuity of 40 to 60Pa; and pentaerythrite oleic ester is obtained after the filtration of remains after vacuumizing. The pentaerythrite oleic ester prepared by adopting the method provided by the invention is specially used in cold-rolling oil, and has the advantages of excellent lubricity, temperature characteristics, annealing detergency and excellent mill housing cleanness.

The invention discloses a crude oil pressure-reduced distillation method and a crude oil pressure-reduced distillation device. A flash tower is arranged between a reduced-pressure furnace and a reduced-pressure distillation tower, an oil transfer line is eliminated, a reduced-pressure distillation raw material is heated in the reduced-pressure furnace and directly enter the flash tower, a small amount of stripping gas is introduced into the flash tower, and the liquid phase, namely flash bottom oil, obtained by gas-liquid separation in the flash tower is introduced into the reduced-pressure distillation tower; and a gas phase, namely flash top gas, discharged from the top of the flash tower is condensed into a liquid phase to be led out of the device. A high-temperature hydrogen or inert gas is introduced into the bottom of the flash tower. When the pressure-reduced distillation method and the pressure-reduced distillation device, in which the flash tower for high-temperature hydrogen or inert gas stripping flash tower is arranged behind the reduced-pressure furnace, are used, the yield of a reduced-pressure fraction oil is increased, the conventional reduced-pressure oil transfer line is not used, the operation load of the reduced-pressure furnace is lowered, and the tower diameter of the reduced-pressure tower can be reduced properly; therefore, equipment investment is reduced, and operation cost is reduced.

The invention provides an absorption-stabilization technology and system for refining. The absorption-stabilization system comprises a gas-liquid balance tank, a rich gas compressor, a rich gas balance tank, an absorption tower, a desorption-stabilization dividing wall tower, a re-absorption tower, a regeneration tank, a desorption gas balance tank and a vacuum pump. The invention further provides the absorption-stabilization technology utilizing the absorption-stabilization system. By adopting the absorption-stabilization technology and system, provided by the invention, the concentration of liquefied gas in dry gas is greatly reduced; and meanwhile, the yield of catalytic gasoline and the liquefied gas can be improved and the energy consumption of the system is greatly reduced.

The invention discloses a technique of preparing 3-fluorin-5-bromobenzotrifluoride which is an intermediate for novel medicine, belonging to the technical field of fine chemicals intermediate. The technique of preparing 3-fluorin-5-bromobenzotrifluoride takes 4-fluorin-6-nitrobenzotrifluoride as the initial material,and the 3-fluorin-5-bromobenzotrifluoride is prepared by reduction, bromination and deamination in sequence. The invention has reasonable and advanced technology, each involving reaction is regular unit reaction, and the 3-fluorin-5-bromobenzotrifluoride is an intermediate for the novel medicine; besides, the invention is easy in industrial production and ensures high yield.

The invention discloses a crude oil distillation method. A primary flash distillation tower is arranged between a normal pressure distillation tower and a pressure reduction furnace, a pressure reduction oil line from an outlet of the pressure reduction furnace to a pressure reduction distillation tower is omitted, a secondary flash distillation tower is arranged between the pressure reduction furnace and the pressure reduction distillation tower, tower bottom heavy oil of the normal pressure distillation tower, i.e. normal bottom oil enters the primary flash distillation tower after being mixed with cyclic pressure reduction slag oil, the tower top gas phase of the primary flash distillation tower is converted into a liquid phase to be used as products through heat exchange and condensing, bottom oil of the primary flash distillation tower enters the secondary flash distillation tower through being heated by the pressure reduction furnace, the tower top gas phase of the secondary flash distillation tower is converted into a liquid phase to be used as products through heat exchange and condensing, and bottom oil of the secondary flash distillation tower is introduced into a flash distillation section of the pressure reduction distillation tower for pressure reduction distillation. Compared with the prior art, the method has the advantages that on one hand, the yield of the pressure reduction slag oil is reduced, and the economic benefits of devices are improved; and on the other hand, the load of the pressure reduction furnace and the pressure reduction distillation tower is reduced, the device investment is saved, and the energy consumption of the devices is reduced.

The invention relates to a mercerised denim production, wherein it uses colored woven denim as raw material; and the production comprises: burning hair of blank cloth, desizing, mercerizing, tensioning, and contracting; said mercerizing is characterized in the wet mercerizing step which immerging it with alkali liquid and stacking at normal temperature; and the production comprises: desizing and dewatering in wet state; immerging and rolling it with alkali liquid in wet state; stacking in normal temperature; washing and drying. The invention has high mercerized degree and high barium value.

The invention discloses a reduced pressure distillation method with low energy consumption and deep total distillation rate. By arranging a reduced pressure flashing tower behind a reduced pressure heating furnace, light fractions vaporized by heat are separated out, load of a reduced pressure distillation tower is reduced and energy consumption of an apparatus is reduced; by arranging a reduced pressure flashing tank behind the reduced pressure distillation tower, relatively light fractions in reduced pressure residues can be further flashed under a vacuum degree higher than that of the bottom of a reduced pressure distillation tower, yield of reduced pressure distillate oil is increased, and thus a reduced pressure distillation operation with low energy consumption and deep total drawing rate can be realized. With the reduced pressure distillation method, the content of fractions with a temperature lower than 500 DEG C in the reduced pressure residues can be reduced to the minimum, so that the distillation rate of the reduced pressure distillation is increased and economic benefits of the apparatus can be increased.

The preparation process of nanometer composite Si-Al material with pyrophyllite as material includes soaking pyrophyllite powder in water, adding silane coupling agent and hydrophobic treatment, coating with surfactant, and dispersing in corresponding solvent to prepare nanometer dispersed emulsion. The said pyrophyllite contains aluminum in 10-30 wt%, and the temperature of water for soaking pyrophyllite powder is 60-95 deg.c. The prepared nanometer composite Si-Al material has high dispersivity, small size effect of nanometer material and excellent modifying effect. The preparation process is advanced, low in cost, less in environmental pollution and suitable for industrial production.

The invention relates to a preparation method of an aluminum base gadolinium oxide neutron absorbing plate. The compact aluminum base gadolinium oxide neutron absorbing plate is prepared to meet a protection requirement of neutron radiation shielding for a spent fuel storage rack of a nuclear power station, and is prepared with aluminum powder, gadolinium oxide powder and copper powder as raw materials after powder metallurgy is performed and rolling is performed. The neutron absorbing plate is silver white. The neutron absorption rate is 95%. The gadolinium oxide distributes uniformly. Particles are closely connected with a matrix. The tensile strength is 170MPa and the elongation is 12%. The preparation method is advanced and reasonable in technology and accurate and full in parameter, and is an advanced method for preparing the aluminum base gadolinium oxide neutron absorbing plate.

The invention relates to a preparation method for a layered aluminum-based neutron absorption plate. The preparation method aims to meet the protection requirement for neutron radiation shielding in aspent fuel storage grillage of a nuclear power station. According to the technical scheme, aluminum powder, boron carbide powder, copper powder, silicon powder, boric acid and carbon fibers are adopted and taken as raw materials, a compact layered aluminum-based neutron absorption plate is manufactured through powder metallurgy blank making and rolling, the neutron absorption plate is silver white, the neutron absorption rate reaches 99%, the interface between all layers is obvious, all the layers are mutually infiltrated, particles are tightly connected with a base body, the tensile strengthreaches 240 MPa, and the elongation is 7%. According to the preparation method, the process is advanced and reasonable, parameters are accurate and detailed, and the preparation method is an advancedmethod for preparing the layered aluminum-based neutron absorption plate.

The invention discloses a coal mine dust removal system and dust removal method. The coal mine dust removal system comprises a trapping device, a pneumatic suction device, an entrainment dust removaldevice, a cyclone separation device, a multi-phase flow division device and a dust exhauster which are connected in sequence, wherein the trapping device, the pneumatic suction device, the entrainmentdust removal device, the cyclone separation device and the multi-phase flow division device are all of tubular structures, every two adjacent devices are integrally connected through a flange, and the pneumatic suction device is connected with a coal mine ventilation pipe through a telescopic hose; a slag discharge port of the multi-phase flow division device is connected with a coal mine slag discharge system through a telescopic pipeline, the entrainment dust removal device is connected with a coal mine water supply system through a hose, and stop valves are arranged on the telescopic hoseand a pipeline of the hose. The coal mine dust removal system is reasonable in unit combination design and small in size, and has the advantages of being small in investment, small in occupied area, low in energy consumption, high in dust removal rate and the like, and the coal mine dust removal method has the advantages of being short in process, low in operation cost and the like.