331results about How to "Improve sintering quality" patented technology

The invention discloses a method for preparing a high-temperature resistant anti-infrared thermal radiation energy-saving coating. The method comprises the following steps of: adding inorganic crystal whisker or / and fiber materials to sol containing titanium and kalium elements, evenly stirring the mixture to form pulp; and coating the pulp on the surface of heat insulating materials, fireproof materials or thermal insulating materials, and sintering the pulp at the temperature of between 200 and 700 DEG C for 0.5 to 5 hours to form compact coatings with the thickness of 0.1 to 5mm, wherein the content of the inorganic crystal whisker or / and fiber materials in the pulp is 5 to 70 weight percent. In the temperature range of between 400 and 1,200 DEG C, the reflectivity of the compact coating which is prepared by the method in a thickness of 0.1 to 5mm on the infrared thermal radiation with the wave length of 500 to 2,500nm is over 90 percent, and after the coating of the invention undergoes 5 thermal shock stability tests at the temperature of 1,000 DEG C, no crack occurs.

The invention discloses a device and a process for generating power through efficient recovery of waste heat of sintered ores and belongs to the technical field of cogeneration. The device comprises a sintered ore cooling system, a waste heat power generating system and a smoke system, wherein the sintered ore cooling system and the waste heat cycling power generating system are connected through the smoke system to form a loop. The process comprises the steps of 1), cooling of sintered ores; 2) the smoke system; and 3) waste heat power generating. The device and the process for generating power through waste heat have the advantages that discharged waste heat is used fully during cooling of sintered ores, the electric energy production is improved significantly, the power rate of the system is reduced significantly, and the energy-saving effect is significant.

The invention discloses a vertical cooling and waste heat recovery furnace for sinters, which comprises a feeding hopper and a discharge hopper, wherein the feeding hopper and the discharge hopper are respectively communicated with the top and the bottom of a cooling chamber; first and second air ducts are sequentially sleeved in the cooling chamber; the walls of the first and second air ducts are respectively provided with a plurality of air outlet holes; the top of the first air duct is provided with a cone distributor; the bottom of the second air duct is communicated with a cold air inlet pipe; the cooling chamber is provided with an inner sleeve; a plurality of vent holes are distributed in the wall of the inner sleeve; a hot air collecting cavity is formed between the inner sleeve and a housing of the cooling chamber; the upper part of the hot air collecting cavity is communicated with a hot waste gas exhaust pipe; and the bottom of the hot air collecting cavity is communicated with the discharge hopper. The invention provides a cooling system integrating sinter cooling with closed hot flue gas recovery and waste heat utilization; the vertical cooling and waste heat recovery furnace for the sinters operates under a negative pressure in the cooling process; emission of pollutants can be greatly reduced; the field environment is improved; and the heat recovery rate is improved.

The invention discloses a preparation method of a porous copper-based shape memory alloy and relates to manufacturing of the porous shape memory alloy. Cu-Al-Mn prealloying powder prepared by compounding of original metal pure Cu powder, pure Al powder and pure Mn powder serves as a base material; the base material is uniformly mixed with absolute ethyl alcohol and then uniformly mixed with decrystallization water NaCl particles, and pressing is conducted to obtain a green body; and the green body is subjected to sinter molding, then placed in boiling water of 100 DEG C to thoroughly removing the residual NaCl particles in holes in a boiling mode and finally placed in a dryer of 60 DEG C to be subjected to heat preservation for 20-30 minutes, and the porous copper-based shape memory alloy with a through hole structure, the average porosity being 50-80% and the average pore diameter being 0.2-1.5 mm is prepared. The defects that in the prior art, the preparation cost of a product is high, and production safety is low are overcome.

A sintering machine comprises a sintering pallet, an igniter, a wind cover and an air bellow. The sintering pallet allows a sintering raw material bed layer including solid fuel to move on the sintering pallet; the igniter is located on the front portion above the sintering pallet; the air cover is located on the rear portion above the sintering pallet; the air bellow is located below the sintering pallet, used for converging smoke obtained after combustion and connected with a smoke pipeline allowing the smoke to be exhausted. The sintering machine is characterized by further comprising at least one air inlet located in the top of the wind cover, at least one fuel gas inlet located in the top of the wind cover and connected with respective fuel gas supply pipelines, and a fuel gas blowing controller arranged on at least one fuel gas supply pipeline and used for controlling the fuel gas blowing amount entering the fuel gas inlets. According to the sintering machine, the energy efficiency of the sintering process can be remarkably improved, and the universality and operation controllability of a system are improved. Based on a variable-fuel-gas-flow blowing system of the sintering machine, the problem of outstanding sintering anisotropism can be effectively relieved.

The invention provides a method for improving the quality of high-chromium vanadium and titanium sinter and belongs to the technical field of ferrous metallurgy. The method mainly comprises the steps that sintering return mines, high-chromium vanadium and titanium concentrate fines, ordinary iron ore concentrate powder, boron iron ore concentrate, metallurgical lime, magnesite, coke powder and other sintering raw materials are subjected to secondary atomization injection and blowing blending, wetting and pelletizing at a certain proportion; then distribution, ignition and sintering are conducted; and finally grain settlement and screening are conducted to obtain the high-chromium vanadium and titanium sinter good in metallurgical performance. The method has the characteristics of being simple in process, high in raw material adaptability, high in production efficiency, low in cost and the like. The quality of the high-chromium vanadium and titanium sinter and the sintering production efficiency can be improved remarkably; the method has important realistic significance for development and utilization of the high-chromium vanadium and titanium sinter and has wide application prospects.

The invention provides a semiconductor laser tube core sintering device and usage thereof, belonging to the technical field of semiconductor optoelectronics; wherein the sintering device comprises a bottom supporting seat, a front baffle, heat sink, a pressure spring prop stay, a spring, a pushing plate, a pressing pin, a prop stay, a warp pressure lever, an elastic prop stay and a sliding foot; the heating and cooling processes of the sintering method are finished in a vacuum chamber and with the protection of nitrogen; firstly, the warp pressure lever is moved to a vacant position far away from the front baffle, then the warp pressure lever is moved under the observation of a microscope, the pressing pin is pressed on the chip exactly, then the device is placed in the vacuum chamber to be heated until the temperature increases to 170-200 DEG C, three minutes later the temperature of the device is decreased to 30-70 DEG C to finish the sintering of the tube core. The invention has the beneficial effects that the adoption of slide foot positioning sintering can simplify the exact positioning of the tube core sintering; the force on the chip applied by the pressing pin effectively reduces the serial resistance and thermal resistance of the tube core, thus resolving the problem of low lighting efficiency caused by tube core movement during melting; the process is simple and practical, the manufacture cost is low, and the productivity is high.

The invention discloses a sintering ratio calculation and sinter cost optimization method, which comprises the following steps of: establishing a linear programming model by taking cost as an optimization target according to a sintering raw material and sinter ratio relation; Acquiring test components of the sintering raw materials and calculating a mean value; Obtaining the average price of eachsintering raw material within a certain period; Inputting the TFe grade and price of each heaped iron ore into a linear programming model, and calculating an optimal solution of the sintering ratio; Inputting the test components and prices of the sintering raw materials into a linear programming model, and adjusting the proportion of the sintering solvent to minimize the cost of the sintering solvent on the premise that the alkalinity and the MgO content of the sintered ore meet the requirements; On the premise that the use amount of the sintering fuel is met, the ratio of the fuels in each pile-making sintering raw material is adjusted to minimize the cost of the sintering fuel; And inputting the result into a linear programming model to obtain the optimized cost and sintering proportionof the sintered ore. The method has the characteristics that the proportioned sinter is stable in quality, reasonable in cost control and high in calculation speed.

The invention discloses a high-strength high-ductility CNTs-SiCp enhanced aluminum-based composite material which comprises the following components: less than or equal to 5vol.% of a carbon nano tube, less than or equal to 5 vol.% of silicon carbide particles and the balance aluminum powder. A preparation method for the high-strength high-ductility CNTs-SiCp enhanced aluminum-based composite material comprises the following steps of: adding raw material components and grinding balls into a ball-milling tank in proportion, adding a process control agent into the ball-milling tank, ball-milling and dispersing under the protection of inert gases, thereby obtaining uniformly dispersed mixed powder; filling a graphite mould with the mixed powder, pre-pressing the mixed powder, and sintering pre-pressed block bodies; and pre-heating a sintered and formed composite material in a tubular furnace under the protection of inert gases, and carrying out thermal extrusion, thereby obtaining the CNTs-SiCp enhanced aluminum-based composite material. The CNTs-SiCp enhanced aluminum-based composite material has very good mechanical property, and also keeps high ductility and high electrical conductivity.

The invention discloses ferrite for an anechoic chamber and a preparation method and applications thereof, and belongs to the field of ferrites. The ferrite is composed of the following components in percentage by mass: 64.6% of Fe2O3, 19.6% of MnO, 13.6% of ZnO, 1.5% of CuO, 0.6% of CoO, 0.06% of SiO2, 0.02% of CaO, 0.01% of Cr2O3 and 0.01% of Cl; and the average grain diameter of the ferrite is 13-22.3 mu m. According to the invention, under the precondition of satisfying the test requirements of the anechoic chamber on the ferrite, compared with wave-absorbing materials of ferrites for anechoic chambers commonly used in the domestic market, the production cost of the ferrite is reduced by 7-10%, the weight is lighter, and the thickness is smaller; and the installation of the ferrite is more convenient.

A device with a griddle and a process for generating power by efficiently recycling sinter waste heat relate to the technical field of waste heat power generation. The device comprises a sinter cooling system, a waste heat power generation system and a smoke system. The sinter cooling system and the waste heat circulation power generation system are connected through the smoke system to form a loop. The process includes 1) sinter cooling, 2) the smoke system and 3) waste heat power generation. The device and the technological process for waste heat power generation have the advantages of completely utilizing waste heat discharged in the sinter cooling process, obviously increasing power generation quantity, obviously reducing system self power utilization rate and being remarkable in energy-saving effect.

The invention discloses a drying sintering furnace which comprises a conveying table. A conveying belt is arranged on the upper plane of the conveying table. A single motor controls two stick wheels to drive the conveying belt to carry out transporting. The conveying table is successively provided with a silicon slice preheating zone, a waste gas combustion zone, a sintering zone and a silicon slice cooling zone from the feeding end to the discharging end. A number of drying preheating furnaces are arranged in the silicon slice preheating zone at intervals. The temperature of a number of drying preheating furnaces gradually rises. A combustion tower is arranged in the waste gas combustion zone. A number of sealed sintering furnaces whose temperature is independently controlled are arranged at intervals in the sintering zone. The temperature of each sintering furnace is the same. A number of blowing devices and suction devices are arranged at intervals in the silicon slice cooling zone. A control device is arranged before or after the conveying table. According to the invention, the structure is simple; the temperature of each sintering temperature zone is balanced; and harmful waste gas is sufficiently combusted.

The invention discloses a belt-type sintering machine material layer steam jetting humidifying device and a humidifying method. The belt-type sintering machine material layer steam jetting humidifyingdevice comprises a steam introducing system and a steam jetting system; the steam introducing system comprises a steam introducing pipeline and steam drying pipes; an inlet of the steam introducing pipeline is connected with a steam source; introduced steam enters the steam drying pipes; the steam drying pipes are arranged at the parts, in the advancing direction of a sintering machine, of the two sides of a sintering machine trolley; the steam jetting system comprises a plurality of nozzle collecting pipes; a plurality of steam nozzles are arranged on the nozzle collecting pipes; and the nozzle collecting pipes are arranged on the steam drying pipes. The heat exchange rate of a sintering material layer is increased obviously, the vertical sintering speed of the sintering is increased, and the utilization coefficient of the sintering machine is further increased; and sintering solid fuels are facilitated being thoroughly burnt, heat generated by burning the sintering solid fuels is increased, the quality stability of sintering ore is ensured, and the guarantee is provided for further reducing the sintering solid fuel consumption.

The invention relates to a temperature control system of a sintering furnace, in particular to a multiple furnace section configuration monitoring system based on the temperature field analysis. The multiple furnace section configuration monitoring system based on the temperature field analysis comprises a continuous sintering furnace which comprises a degreasing section, a low-temperature sintering section, a high-temperature sintering section and a cold treatment section; each section is provided with at least one sensor and one solid state relay and connected with a temperature control instrument which is connected with an upper computer by a conversion interface; and the upper computer comprises an expert control subsystem and a configuration monitoring subsystem which are connected by ODBC. The multiple furnace section configuration monitoring system based on the temperature field analysis provided by the invention completes the development of the temperature control system of the continuous sintering furnace by the characteristics of non-linear, large lag and strong coupling of the temperature control of the continuous sintering furnace, the temperature field analysis and the configuration software design and the like, thus improving the precision of the temperature control significantly.

The invention provides a pressure sintering furnace with a rapid cooling function. The pressure sintering furnace with the rapid cooling function comprises a draught fan, heat exchangers, gas diversion covers, airflow diversion plates, cooling water inlet and outlet pipes, a furnace shell water jacket, thermal insulation door air cylinders, material box door air cylinders, furnace doors and a furnace body. Thermal insulation doors, material box doors, thermal insulation cylinders and a high temperature product area are arranged in the furnace body; and material boxes are arranged in the high temperature product area. The draught fan and the heat exchangers are installed on the furnace doors; the heat exchangers are connected with the cooling water inlet and outlet pipes correspondingly; the gas diversion covers are installed on the corresponding thermal insulation doors and attached to the corresponding thermal insulation cylinders; the airflow diversion plates are uniformly distributed on the periphery of the inner wall of a furnace shell; the cooling water inlet and outlet pipes communicate with the furnace shell water jacket, and the furnace shell water jacket is located between the furnace shell and the inner wall of the furnace body; carbon felt doors and the material box doors are of a double-air-cylinder independent opening-closing structure; and the thermal insulation door air cylinders and the material box door air cylinders are installed on the corresponding furnace doors and connected with the thermal insulation doors and the material box doors correspondingly. The pressure sintering furnace with the rapid cooling function is stable and reliable in using, improves production efficiency and product quality, and is especially suitable for sintering of small-sized hard alloy products.

The invention relates to a method for producing diffusion couple with powders including the following steps: (1) powder material A is filled in a metal casing which do not diffuse or react with the contacted powder and then is pressed to form a compact; (2) the compact is punched by a die with a diameter which is 4-6 mm smaller than the inner diameter of the metal casing; (3) another powder material B is filled in the holes and then treated by compaction, sintering at a certain temperature, air-cooling to get a diffusion couple. The ring canning diffusion couple produced by compacting powder in the invention utilizes the high shrinkage of the outer powder in the sintering process to provide a interfacial binding force to the powder material of each layer in the jacket, thereby guaranteeing a full integration of the powder in each layer and providing a possibility to the preparation and the interface study of the layered composite powder materials.

The invention discloses a material temperature control method of a sinter-circle-cooling machine and belongs to the technical field of measurement and control of the metallurgical industry. The material temperature control method includes the steps that the surface temperature values of materials on a trolley of the sinter-circle-cooling machine in all blasting sections in the cooling process are measured by non-contact temperature measurement devices arranged at the blasting sections of the sinter-circle-cooling machine, and the temperature values are transmitted to a central control unit, so that the actual temperature change value of a temperature field of the sinter-circle-cooling machine is obtained; the ventilation quantities of outlets of air blowers in the cooling process are obtained through measurement by flow meters at the outlets of the air blowers, and the ventilation quantities are transmitted to the central control unit, so that the flow change value of the outlets of the air blowers is obtained; according to the technical requirement for the thermal parameters of the sinter-circle-cooling machine, an ideal temperature curve needed in the production progress is set, that is, the initial temperature set value is determined, the deviation between the actual temperature change value of the temperature field of the sinter-circle-cooling machine and the initial temperature set value serves as a system disturbance, the flow change value of the outlets of the air blowers serves as a system feedback, and the ventilation quantities of the air blowers are controlled by controlling the opening degrees of air gates of the air blowers.

The invention discloses a method for controlling the defect of sintering expansion of powder metallurgy material and products thereof and a mold. In the sintering process of powder body, three-dimensional restraint compressive stress is applied to the body, thus generating restraint action to the body, restraining volume expansion generated by physical or chemical reactions of the body in the sintering process, realizing restraint sintering, controlling sintering densification thereof and eliminating the defects of sintering expansion. A restraint mold (1) is internally provided with an external mold; the matching conicity between the restraint mold (1) and the external mold is Theta which is larger than 5 degrees and smaller than 15 degrees; the external mold is internally provided with an internal mold; and a spacer (6) which is used for preventing the reaction of the body and the mold is arranged between the internal mold and the sintering body. The invention is a restraint sintering method which can effectively prevent the powder metallurgy material and products thereof from generating expansion, deformation, cracking and pore / hole and the like and can improve the sintering density and quality; and the using method of the mold is simple and easy to operate.

The invention discloses a preparation method of pore-opening foamy copper having controllable porosity and pore diameter. The method comprises the steps: adopting a powder metallurgy method, mixing uniformly rock candy particles with an electrolytic copper powder and an additive anhydrous ethanol, then pressing to obtain a green blank, placing the green blank in boiling water, rinsing to thoroughly dissolve and remove the rock candy particles, after washing and drying, placing the obtained article in an inert gas atmosphere for sintering, cooling together with a furnace to the room temperature, and thus obtaining the pore-opening foamy copper product constructed by a three-dimensional interconnected space network and having the porosity of 50-85% and the average pore diameter of 0.2-2 mm. The obtained pore-opening foamy copper has higher sintering quality, and has quite good mechanical properties and compressive energy absorption characteristic.

The invention belongs to the technical field of metallurgy, and relates to a rotary sintering machine system. The system comprises a rotary sintering machine and a discharging device, and a cutting device is arranged at the discharging end of the rotary sintering machine. The cutting device is a horizontal shearing device or a vertical pressure cutting device, and the cutting device moves synchronously with sintered ore cakes during cutting. The discharging device is a driving pushdown discharging device and moves synchronously with the sintered ore cakes during discharging, and a steel wire brush is arranged on the lower part of a pushing head. Through the rotary sintering machine system, the effective area of the single sintering machine can reach 800 square meters, the air leakage rate of the sintering machine is less than 1 percent, and the investment of a supporting dust removal and desulfurization system is reduced by half. When the sintering machine with the scale of 3 million tons of sintered ore per year is constructed by adopting the system, the power consumption can be reduced by 40 million kW.h per year, the power fare of a main exhaust fan is reduced by 20 million yuan per year, the discharge of CO2 is reduced by 41 million tons per year, and the maintenance cost is reduced by 10 million yuan per year, and the discharge of SO2 is reduced by 30 million tons per year.

The invention relates to a ternary ferroelectric solid solution lead niobate ytterbate-lead zinc niobate-lead titanate. The chemical formula of the solid solution is xPb(Yb1 / 2Nb1 / 2)O3-yPb(Zn1 / 3Nb2 / 3)O3-(1-x-y)PbTiO3, wherein x is more than 0 and less than 1, and y is more than 0 and less than 1, and the solid solution belongs to a typical composite perovskite structure. The system is good in piezoelectric and electromechanical performance, high in Curie temperature and good in thermal stability, and has a wide application prospect.

A furnace type efficient recovery system for flue gas waste heat of cooled sinter comprises an air blower, a cooling furnace, a primary dust remover, an emergency blow-off valve, a waste heat boiler, a secondary dust remover, a draft fan and a chimney. An outlet of the air blower is communicated with a cooling air inlet on the lower portion of the cooling furnace. A flue gas outlet on the upper portion of the cooling furnace is communicated with the primary dust remover, the waste heat boiler, the secondary dust remover, the draft fan and the chimney through pipelines successively. The emergency blow-off valve is arranged on a pipeline between the primary dust remover and the waste heat boiler. A connection pipeline is arranged between the draft fan and the air blower. The furnace type efficient recovery system for flue gas waste heat of cooled sinter has the advantages that the sinter quality is improved, the sinter return rate is reduced, flue gas parameters are stable, the system own power consumption rate is reduced, and the energy-saving effect is apparent.

An embodiment of the invention discloses microwave sintering equipment, which comprises a vacuum furnace body, a material shifting mechanism, a microwave sintering device and a microwave source. The microwave sintering device is arranged on the material shifting structure, and the material shifting structure which is capable of sliding along an extension direction of the vacuum furnace body is mounted in the vacuum furnace body. The material shifting mechanism can slide inside the vacuum furnace body in a reciprocating manner, accordingly, the material sintering device is driven to reciprocate under the heating effect of the microwave source, materials can be uniformly heated, and problems of deformation, cracking and the like of sintered articles due to local heating are avoided. In addition, by the aid of the microwave sintering equipment, the materials can be uniformly heated, and the sintering quality of the materials is improved.

The invention relates to a self-cyclic utilization device for sinter machine tail smoke and tail wind box smoke. The self-cyclic utilization device comprises a trolley (1), wherein a seal cover (8) is arranged above the trolley (1); the tail of the trolley (1) is provided with a dust-removing cover (9); a plurality of wind box (2) are connected below the trolley (1); a large gas flue (6) is arranged below the air bellows (2); and all the air bellows (2) are communicated with the large gas flue (6). The self-cyclic utilization device is characterized in that the top of the dust-removing cover (9) is closed; the seal cover (8) is internally provided with a clapboard II (11); the seal cover (8) is divided into front and back sections by the clapboard II (11), the front section of the seal cover (8) is closed, and the back section of the seal cover (8) is communicated with the dust-removing cover (9); and a clapboard I (10) is arranged inside the large gas flue (6) and divides the large gas flue (6) into the front and back sections, the front section of the large gas flue (6) is sequentially connected with a dust remover (5), a main draft fan (4) and a chimney (3), and the back section of the large gas flue (6) is connected to the front section of the seal cover (8) through a pipeline.

The invention relates to novel oxidizing-resistant nanometer copper soldering paste and a preparation method and application thereof. By adopting a magnetron sputtering process, the surface of nanometer copper powder is evenly coated with a metal film. Silver, gold and the like can be selected as the components of the metal film as required; then a traditional nanometer copper soldering paste formula continues to be used, a proper amount of forming auxiliaries are added; and finally, the novel oxidizing-resistant nanometer copper soldering paste resistant to oxidizing and cracks is prepared. Compared with the prior art, according to the novel nanometer copper soldering paste, mutual connection between a chip and a substrate can be achieved by means of a low-temperature sintering process or a pressurizing low-temperature sintering process, a traditional nanometer copper soldering paste function is achieved; and oxidizing resistance, crack initiation resistance and an extending performance are achieved at the same time, the novel oxidizing-resistant nanometer copper soldering paste can be used in large-power high-temperature electronic device packaging, and is especially suitable for packaging of third-generation semiconductor devices, after packaging, a connector is good in performance, fault-free service under high temperature can be achieved for a long time, and the novel nanometer copper soldering paste is matched with an existing lead-free solder packaging process.

The invention relates to a thick material layer sintering ore sintering distribution control method and a distribution device thereof. 5-7 parts are transversely uniformly distributed on an upper material layer of a bogie; 5-7 fine adjustment gates which correspond to the parts and are transversely arranged along the bogie of a sintering machine are arranged below a main gate, and each fine adjustment gate is used for adjusting a gap between a feeding roll on the corresponding part and the main gate and adjusting the size of feed at the position, so that the thicknesses of the material layers of the corresponding parts on the bogie are controlled. 5-7 layer thickness gauges which correspond to the 5-7 fine adjustment gates are arranged at a sintering end point in front of a multi-roll distributor, change of the thickness of a middle material layer is obtained according to detection results of the layer thickness gauges, the rotation speed of the feeding rolls and / or the opening of the corresponding fine adjustment gates on the different parts are correspondingly adjusted, and concave bevel edges with certain slope are formed on the material layers in the transverse thickness direction of the bogie of the sintering machine after distribution. Accordingly, requirements on a flue gas desulfurization process for large-scale production of the sintering machine are met to the greatest extent while the quality and the yield of sintering ores are stably increased, and annular cooling afterheat recycling heat is improved.

The invention discloses a tunnel kiln environment conditioning method and a device of automatically adjusting the temperature in a kiln. The tunnel kiln environment conditioning method includes the following steps: S1, environmental information acquisition equipment is arranged in a tunnel kiln, wherein the environmental information acquisition equipment is used for acquiring environmental parameters of the environment to be conditioned in the tunnel kiln and sending the environmental parameters to a controller; S2, the controller generates an environment conditioning command according to the environmental parameters acquired by the environmental information acquisition equipment, and sends the environment conditioning command to an environment conditioning execution mechanism; and S3, the environment conditioning execution mechanism conditions the environment in the tunnel kiln according to the environment conditioning command sent from the controller. The tunnel kiln environment conditioning method can control the angle of a temperature adjustment burner, the combustion gas injection rate, the angular rate of the temperature adjustment burner, the kiln tail blast rate, and the like, of the tunnel kiln, and can perform sintering research on various refractory materials, thus increasing diversity of research.

The invention belongs to the field of sintering mixtures and particularly relates to a sintering mixture and an application thereof. The sintering mixture is characterized by consisting of the following components in parts by weight: 9-12 parts of quick lime, 1-3 parts of dolomite, 4-6 parts of fuel, 81-84 parts of uniformly-mixed mineral powder and 31-34 parts of return fines, wherein the fuel consists of coke powder and semicoke, and the part ratio by weight of the coke powder to the semicoke to (7-9):(1-3) according to the total weight of the fuel. The thickness of a feed layer is more than or equal to 700mm, and the ignition temperature is 1170-1200 DEG C. According to the sintering mixture and the application thereof, the problems of caking, blockage and the like in electrostatic precipitation are solved, the sintering production cost is reduced, and therefore the purposes of improving the quality of sintering ore, saving energy and protecting environment are achieved.

The invention discloses a metal powder pre-pressing device for a polycrystalline diamond wire-drawing die bushing. A metal powder pre-pressing process is realized by a pressure source operation mechanism using a mechanical jack as a pressure source, a lower press head operation mechanism and a pressure value display mechanism, so that the whole metal powder pre-pressing process is easy to operate, visible and controlled, and has an accurate pressure value, and the inconvenience caused by frequently changing pressure data through a pre-pressing device controlled by using a hydraulic device can be avoided. Meanwhile, the invention provides a metal powder pre-pressing method which is realized based on the metal powder pre-pressing device, an enough amount of base powder, an enough amount of circumferential powder and an enough amount of top powder which are put into the periphery of polycrystalline diamond blanks are pre-pressed for three times so that a metal bushing with good sintering quality can be formed around the polycrystalline diamond blanks in a sintering process of the polycrystalline diamond wire-drawing die. The metal powder pre-pressing device and the metal powder pre-pressing method are suitable for pre-pressing the metal powder before the bushing is sintered by using middle-scale and large-scale polycrystalline diamond blanks.

The invention provides a sintering method of super-thick material layer sinter. The thickness of a sintering material layer is 920-950mm, the sintering moisture is 6.2-6.4%, and the sintering negativepressure is 14.5-15.5kPa. The sintering method comprises the specific steps of (1) burdening, (2) mixing and pelletizing, (3) mixture preheating, (4) micro-negative pressure ignition, and (5) material loosening. According to the sintering method, through development and application of a low-moisture pelletizing technology, low-pressure steam efficient preheating of a mixture is conducted to increase the material temperature, development and application of a micro-negative pressure ignition technology and transformation and application of three rows of material loosening devices, the thicknessof the material layer is increased, the machine speed of a sintering machine is decreased, the sintering crystallization reaction is promoted, the internal return mine rate is decreased, and the quality and yield of the sinter are improved; the thickness of the material layer is increased to 930mm or above from 730mm, the sintering negative pressure is decreased to 14.5kPa-15.5kPa from 16.0kPa-17.0kPa, low-power-consumption and low-fuel-consumption sintering under the super-thick material layer condition is achieved, and the sintering cost is reduced; and NOx emission of sintering raw flue gas is reduced by about 37%, and efficient process emission reduction of the sintering flue gas NOx is achieved.