18 results about "Recovery" patented technology

The invention discloses a method and device for preparing a mixed crystal structure material through friction stir solid-phase deposition, and belongs to the technical field of heterostructure material preparation. According to the method, firstly, a deposition head is used for carrying out single-layer friction stir solid-phase deposition on a needed material, then a special corrugated roller is used for carrying out cold rolling to enable different positions of the surface of the deposition material to be subjected to different degrees of cold deformation, and therefore uneven high dislocation density is introduced into a deposition layer, and then next-layer friction stir solid-phase deposition is carried out on the surface of the deposition layer. In the friction-stir solid-phase deposition process, static recrystallization and static recovery rapidly occur in a local high-dislocation-density area to maintain fine grains, and grain growth rapidly occurs in a low-dislocation-density area due to heating, so that the whole deposition layer shows the mixed crystal structure characteristic that fine grains and coarse grains coexist; the block mixed crystal structure material can be prepared through stirring friction solid phase deposition and cold rolling circulation.

This invention provides a method for producing 270MPa grade hot-dip galvanized deep-drawing steel strip. The method controls the chemical composition, the hot rolling process (including soaking temperature, final rolling temperature, and coiling temperature), and the hot-dip galvanizing process (including annealing temperature, galvanizing temperature, finishing, and tension leveling). This results in hot-dip galvanized steel strip with excellent mechanical properties (Rp0.2 = 185–255 MPa, Rm ≥ 270 MPa, A50mm ≥ 42%, n90 ≥ 0.17). It effectively overcomes the problems of mixed crystals and performance deterioration in the pickling-hot-dip galvanizing technology during annealing due to lack of deformation recovery, recrystallization, and grain growth. The product's microstructure is 100% ferrite with a ferrite grain size of 8.0–10.5. Furthermore, the pickling-direct hot-dip galvanizing process used in this invention omits the conventional cold rolling step, reducing process costs.

The application provides a superfine nanocrystalline silver alloy and a preparation method thereof, and belongs to the technical field of superfine crystal preparation.The superfine nanocrystalline silver alloy is prepared by the following steps: firstly, rolling the silver alloy; secondly, breaking the original grains in the silver alloy by rolling; thirdly, transforming the broken grains into equiaxed grains by annealing; fourthly, cross-extruding under ultralow temperature to inhibit recovery recrystallization; fifthly, breaking the equiaxed grains into superfine equiaxed grains by cross-extruding; sixthly, further refining the grains by ultralow-temperature rolling; and finally, recrystallizing the broken grains by annealing after rolling, so that the superfine nanocrystalline silver alloy with nanometer grain size is obtained; the superfine nanocrystalline silver alloy has uniform microstructure, obvious strength improvement, good conductivity and ductility, and the preparation method is simple, easy to popularize in large scale, and has wide application prospect in industry.

The invention discloses a beneficiation process for improving the magnetic iron recovery rate of wide-fraction tailings, and belongs to the technical field of beneficiation. The magnetic iron grade of tailings can be effectively reduced, and the magnetic iron recovery rate is increased; the problems that in the prior art, iron tailings are low in concentration, wide in particle size distribution range and difficult to recycle, and resource waste is caused are solved. According to the invention, the magnetic separation operation is carried out on the fine-grain tailings after wet-type pre-separation and classification and the micro-fine-grain tailings generated by stage grinding separation and elutriation and concentration, and the advantages of good coarse-grain recovery effect of the disc magnetic separator, high magnetic field intensity, large gradient and good fine-grain recovery effect of the cage magnetic separator are utilized; the technical effect of improving the magnetic iron recovery rate of the wide-fraction tailings is achieved, the effects of resource recovery and comprehensive utilization and compliance and yield increase are achieved, meanwhile, the whole improvement cannot cause waste of existing equipment, the improvement cost is relatively low, and the method is suitable for large-scale production.

The invention discloses a low-power-consumption variable-frequency starting PTC (Positive Temperature Coefficient) thermistor and a preparation method thereof, and belongs to the technical field of PTC thermistors. The resistor comprises a PTC ceramic base material, a glass phase material, a semiconducting agent and a manganese additive, wherein the high-temperature-resistant ceramic material comprises the following raw materials in percentage by mass: 48%-62% of BaCO3, 22%-38% of TiO2, 0.5%-1.2% of SrCO3, 4%-8% of CaCO3, 4%-8% of PbO, 0.3%-0.6% of a glass phase material, 0.25%-0.45% of a semiconducting agent and 0.3%-0.6% of Mn (NO3) 2. Through the synergistic effect of component regulation, dual coating modification and segmented atmosphere sintering, a grain boundary structure and a potential barrier are effectively regulated, the contradiction between size reduction and reliability, between Curie temperature reduction and recovery time, and between chip temperature rise and thermal shock resistance is solved, and high reliability and excellent performance of a product under low power consumption are achieved.

The invention relates to a metal sheet blanking surface quality control method which comprises the following steps: applying micro-plastic excitation to a metal sheet before blanking to obtain an instantaneous recovery parameter of a material under low-energy deformation so as to judge a shear response state of the metal sheet; judging the deformation stability of the material in the current stress field according to the shear response state, and classifying the characteristics as shear offset or strain concentration characteristics; aiming at a shearing offset type material, a sliding shear path of low-speed feeding and gap reduction is adopted; aiming at a strain concentration type material, adopting a splitting path of high-speed rushing-in and strengthening front angle fracture; monitoring derivative changes of blanking force and a displacement curve in the blanking process, identifying a fracture critical stage, dynamically adjusting the feeding speed of a punch, and regulating and controlling the fracture morphology through acceleration or deceleration; and the edge springback behavior of the punch in the return stroke stage is detected at the blanking tail end, if a warping trend exists, the tail end calendaring correction action is activated, and secondary shaping of the edge area is achieved by combining an obtuse-angle pressing head or a conical structure of the punch with material springback kinetic energy.

The invention discloses a radial forging forming method of a variable cross-section long shaft type forging.The method comprises the steps of blanking, overall drawing-out, intermediate shaft radial forging, transition part forging and the like, in the overall drawing-out process, high-frequency and low-frequency alternate forging is adopted, carbides can be effectively broken, the comprehensive performance of metal materials is improved, and the yield is improved. The crystal mixing phenomenon is eliminated, and the forging quality is improved. And the final heating number deformation is larger than 30%, and a forge piece with fine and uniform grains can be obtained. And the final forging temperature is controlled to be not lower than the recrystallization temperature of the metal material, so that the recovery and recrystallization processes of crystal grains can be completed completely, the crystal grains are further refined, and the performance of the forge piece is improved. The method is suitable for forging forming of the variable-cross-section long-shaft type forgings.

The invention discloses a preparation method of a high-hardness and high-strength ultra-fine grain copper plate, and belongs to the technical field of copper material processing. The method comprises the following steps: polishing and cleaning a copper plate; overlapping a plurality of copper plates and fixing edges; completely immersing the laminated copper plate in a low-temperature cooling medium and cooling the laminated copper plate to-196 DEG C to-190 DEG C; the pre-cooled sample is taken out and fed into a pre-cooled roller to be rolled, and single-pass rolling is completed within 60 seconds; the rolled plate is cut, surface treatment, overlapping fixing and low-temperature cooling are carried out again, and next circulation is carried out; and repeatedly carrying out multi-pass rolling, wherein the sample is kept in a low-temperature state every time. According to the method, two technologies of cryogenic treatment and accumulative ply rolling are organically combined to generate a synergistic effect, dynamic recovery and recrystallization processes are greatly inhibited by utilizing low temperature, the dislocation density is improved, the refining limit of a traditional processing mode on the grain size is broken through through large dependent variable, an ultra-fine grain even nanocrystalline structure with a uniform structure is obtained, and the method is suitable for large-scale production. And the hardness and tensile strength of the material are effectively improved.

The invention discloses a recovery method of a quartz crucible after application of a Czochralski single crystal, and relates to the technical field of waste recovery. The method comprises the steps of sorting, grading and screening, preliminary cleaning, high-temperature treatment (500-1000 DEG C, heat preservation for 4-8 hours), water quenching and cooling, secondary screening, high-purity fused quartz treatment and cristobalite treatment. The core is that the fused quartz and the cristobalite are efficiently separated by utilizing the thermophysical property difference between the fused quartz (the thermal expansion coefficient is 0.5 * 10 <-6 > / DEG C) and the cristobalite (the thermal expansion coefficient is 11 * 10 <-6 > / DEG C) and the stress generated by crystal form transformation (beta-alpha, and the volume expansion is 2.8%) of the cristobalite. The fused quartz silica powder (used for ceramic crucible coatings, PCBs and the like) and the high-purity cristobalite silica powder (used for high-end ceramics, coatings and the like) with the purity larger than or equal to 99.995% can be obtained, the fused quartz recovery rate reaches 74% or above, the whole process is environmentally friendly and free of pollution, the problems that an existing recovery method is low in additional value and poor in product quality are solved, and the method is suitable for industrial production. And high value-added utilization of the scrapped quartz crucible is realized.

The invention discloses a beneficiation process for improving the magnetic iron recovery rate through wide-particle-fraction tailing grading magnetic separation, and belongs to the technical field of beneficiation. According to the invention, fine-grain tailings after wet-type pre-selection and classification and micro-fine-grain tailings generated by stage grinding separation and elutriation and concentration are subjected to pre-classification operation, and underflow and overflow generated by classification are subjected to magnetic separation by utilizing the advantages that a disc type magnetic separator has a good coarse particle recovery effect and a cage type magnetic separator has a good fine particle recovery effect; coarse and fine particles containing magnetic iron in tailings are recovered in a balanced manner, so that the technical effect of improving the magnetic iron recovery rate of the wide-fraction tailings is achieved, the effects of resource recovery and comprehensive utilization and compliance and yield increase are achieved, meanwhile, the whole improvement does not cause waste and tailing pre-shunting of existing equipment, the equipment consumption and initial investment can be effectively reduced, and the economic benefit is improved. The system processing capacity is improved, the improvement cost is relatively low, and the method is suitable for large-scale production.

The application discloses a method and device for preparing a mixed crystal structure material by using a friction stir solid-phase deposition, and belongs to the technical field of preparing a heterogeneous structure material. The method first uses a deposition head to perform single-layer friction stir solid-phase deposition on a required material, then uses a special corrugated roller to perform cold roller pressing, so that different positions on the surface of the deposited material are subjected to different degrees of cold deformation, thereby introducing uneven high dislocation density to the deposited layer, and then performing next-layer friction stir solid-phase deposition on the surface. In the friction stir solid-phase deposition process, the local high-dislocation-density area rapidly undergoes static recrystallization and static recovery to maintain fine grains, and the low-dislocation-density area rapidly undergoes grain growth under heat, so that the whole deposited layer exhibits the mixed crystal structure characteristic of coexisting fine grains and coarse grains. Through the circulation of the friction stir solid-phase deposition and the cold roller pressing, the bulk mixed crystal structure material can be prepared.

The invention relates to the cross technical field of perovskite photovoltaic device manufacturing and material recycling, and particularly discloses a system and method for purifying C60 through a sublimation method. The system comprises a scraping unit, a collecting and sorting unit and a purifying unit, the scraping unit is used for stripping waste attached to the inner wall of the vacuum evaporation chamber; the collecting and sorting unit is used for separating magnetic metal oxides and directionally conveying waste materials; the purification unit is used for constructing a migration channel with a temperature gradient, and C60 is selectively deposited in sublimated waste. According to the system, through a triple impurity removal mechanism of physically screening out magnetic impurities, removing high-boiling-point pollutants through sublimation and stripping C60 polymer through gradient condensation, generation of C60 crystal structure defects is effectively avoided, the C60 purity is remarkably improved, and the problems that in an existing C60 recovery process, C60 crystal defects are prone to being caused by high temperature, C60 polymer is generated, other composite impurities cannot be effectively removed, and the production cost is low are solved. And finally, the purity of the recovered product is low, and the reusability is poor.

The embodiment of the invention discloses a method for detecting Cr isotope in a low-content sample by thermal ionization mass spectrometry. The method comprises the following steps: digesting a sample to obtain a to-be-loaded solution; the method comprises the following steps: cleaning and balancing a quartz glass column filled with AG 50W-X12 resin, loading a sample while the quartz glass column is hot, sequentially adding 1N HCl and collecting, eluting matrix elements by the 1N HCl and the 1N HCl and collecting, and combining collected liquids to obtain a to-be-loaded liquid; the method comprises the following steps: cleaning and balancing a PP micro column filled with AG 50W-X12 resin, loading a sample, sequentially adding 1N HF and 1N HCl to elute matrix elements and 6N HCl, and collecting; single rhenium belt sample application is carried out, and a thermal ionization mass spectrometer is adopted for testing. A stable Cr isotope analysis process which is high in recovery rate, low in blank, high in resolution and few in separation step is established on a thermal ionization mass spectrometry (TIMS) platform, and the method has remarkable advantages in high-precision analysis of low-Cr samples and is suitable for high-precision Cr isotope separation and determination of low-Cr-content samples.

This invention relates to a method for treating high-grade bottom-blown furnace slag. The method involves slowly cooling complex high-grade bottom-blown furnace smelting slag in its molten state, with an average copper content >6%, to obtain recycled copper ore with a certain crystallization particle size. The recycled copper ore is pre-crushed to obtain high-grade slag bottoms with an average Cu content ≥44% and high-grade slag with an average Cu content >4%, Au content ≥1.4 g / t, and Ag content ≥35 g / t. The high-grade slag bottoms are processed by a direct grinding process to obtain a high-grade concentrate with a copper content ≥44%. The high-grade slag is then processed by a series-parallel grinding and flotation process to obtain a slag concentrate with a Cu content >20%, Au content ≥5.79 g / t, and Ag content ≥118 g / t, and tailings with a copper content ≤0.28%. This invention features low energy consumption, simple process, and high recovery rate.

The invention belongs to the technical field of high-temperature alloy, and particularly relates to a recovery heat treatment method of a novel pre-deformed nickel-iron-based high-temperature alloy pipe. The method comprises the following steps: carrying out 5%-35% room temperature plastic deformation on the alloy pipe; the pre-deformed alloy pipe is subjected to heat preservation at the temperature of 1080-1130 DEG C and then cooled to the room temperature; and secondary recovery heat treatment is conducted at the temperature of 960-1050 DEG C, heat preservation is conducted, the temperature is lowered to the room temperature, tissue damage is eliminated, and gamma'phase precipitation is induced. After the alloy pipe is subjected to restorative heat treatment, the recrystallization process can be caused under the driving of relatively high strain storage energy, so that the grain size is recovered to the normal size, and the comprehensive strength of the material is further improved; the Sigma CSL (Sigma < = 29) grain boundary proportion is stabilized at 30% or above, and the special grain boundary proportion returns to normal and is close to the original state; the high-proportion special grain boundary inhibits crack propagation, and compared with a pre-deformed alloy, the high-temperature durability of the alloy is remarkably improved.

The application discloses a micro-fine particle grade ilmenite magnetic field reinforced recovery device and method, relates to the magnetic separation field of separating solid materials from fluid, and solves the problem that micro-fine particle grade ilmenite and gangue are difficult to separate. The technical scheme is as follows: the micro-fine particle grade ilmenite magnetic field reinforced recovery device comprises a shell and an inclined plate, the shell has an inner cavity in the shape of an inclined quadrangular prism, at least two inclined plates are fixed in the inner cavity of the shell, the inclined plates are double-layer structures, the double-layer structures are respectively upper layers and lower layers, the upper surface of the lower layer is provided with continuous or intermittent tines; a separation channel is formed between the two adjacent inclined plates, the upper and lower ends of the separation channel are overflow outlets and underflow outlets, the underflow outlet is provided with an opening adjusting device, each separation channel is provided with a feeding port and a water inlet, and the shell is further provided with a magnetic field generator. The tines of the lower layer of the inclined plate form a magnetic field reinforced area in the separation channel, the force and the movement direction of the ore particles are changed, and the purpose of separating ilmenite and gangue is achieved.

The invention relates to the technical field of metal heat treatment, in particular to a metal rolled plate gradient annealing device and method. The cooling assembly is arranged below the heating assembly, and an annealing space used for bearing the plate is formed between the heating assembly and the cooling assembly; wherein the heating assembly and the cooling assembly are parallel to each other, and under the condition that the heating assembly and the cooling assembly are assembled together, uniform temperature is provided for the upper surface and the lower surface of a plate, so that the plate forms a temperature gradient in the thickness direction. And respectively heating and cooling the upper surface and the lower surface of the rolled plate by adopting an asymmetric heat treatment mode so as to form a temperature gradient in the thickness direction. Different annealing temperatures are obtained in different layers in a rolled plate, so that the layers are subjected to different recovery, recrystallization and grain growth processes, an effective gradient microstructure is formed, and the overall performance is improved.

A method for predicting the mixed crystal grade in the hot forging discontinuous deformation process of a large forge piece belongs to the technical field of material forming simulation, a grain structure evaluation port is moved forward to have the characteristics of defect prediction and process optimization, and the mixed crystal defect in the hot forging process of the large forge piece is favorably controlled. Comprising the following steps: S1, establishing a microstructure cellular automaton model in the hot forging discontinuous deformation process; s2, carrying out macro-micro multi-scale FE-CA coupling on the hot forging discontinuous deformation; wherein the step S1 sequentially comprises the following steps: establishing an evolution model of a microstructure in a dynamic recrystallization process, establishing an evolution model of cellular dislocation density in a static recovery process, determining a static recrystallization nucleation rate, establishing an evolution model of a microstructure in a sub-dynamic recrystallization process, coarsening crystal grains, and establishing a microstructure CA model; and the step S2 comprises acquisition of node physical field quantity, data processing and a simulation process.