158results about How to "Fine particle size" patented technology

The invention provides an engineering standardized construction process control method on the basis of BIM (building information modeling). The method comprises a construction scheme analysis step, a BIM model association step, an on-site task prompt step, and an on-site data collection step. The invention also provides a corresponding system. According to the engineering standardized construction process control method and system on the basis of the BIM, each construction procedure is created or searching is performed to obtain a corresponding subtask, the subtask is associated with building components in a BIM model, according to instructing information such as subtask prompt, operation instruction and the like, the engineering which is completed and executed step by step is namely standard engineering; retention of on-site data collection can be performed in a engineering process, is convenient for tracing in the future, and remote control on live on-site construction is also convenient to be performed.

The invention discloses a method for preparing a high-nickel concentrate from a low-grade red soil nickel ore, which comprises the following steps of: drying the low-grade red soil nickel ore until water content is 13 to 16 percent, crushing to ensure that the size of all particles is less than 3mm, grinding by using a high-pressure roller mill to ensure that particles with the size of less than 0.074mm account for 80 percent and specific surface area is not less than 2,000cm<2>/g, adding 15 to 20 percent of composite binder and 1 to 5 percent of coal powder, and pelletizing by using a disc pelletizer to obtain green pellets with the size of 6 to 16mm; drying and preheating the green pellets on a chain grate for water removal and solidification to ensure that each piece of pellet entering a kiln has the compression strength of over 500N; directly adding the preheated and solidified pellets into a rotary kiln, and reducing at the temperature of between 1,100 and 1,250 DEG C for 60 to 120 minutes by using pea coal as a reducing agent in a mass ratio of the reducing coal to the pellets of 0.8-1.0; and cooling a reduction product, sieving, performing magnetic separation to obtain a magnetic product, crushing, grinding, and performing magnetic separation to obtain the high-nickel concentrate, wherein the composite additive comprises the following components: Na2CO3 and CaO, iron oxide powder, the coal powder and sodium humate in a ratio of (30-60):(20-30):(20-30):(5-10). The method is high in adaptability and nickel recovery rate and suitable for mass production.

The invention relates to a course selection and scheduling system and method. The system includes a course selection system and a course scheduling system, and the course selection system and the course scheduling system can realize data exchange. The course selection system includes a first application service layer module, a first algorithm module, a data access layer module, a buffer layer module, a database module, and a database cluster level module. In addition, the course scheduling system includes a second application service layer module, a second algorithm module, a computing platform and a data storage layer module which are sequentially connected. The course scheduling mode is advantaged by flexibility, fine granularity, free constraint combination, combination of mobile learning and non-mobile learning classes, and high compatibility. The automatic schedule generation algorithm allows semi-automatic or manual distribution, the strength of course scheduling can be refined to each student, and the weight of each constraint can be flexibly adjusted to support course scheduling of mobile learning and non-mobile learning classes at the same time.

The invention relates to a low-grade fluorite silicon reduction mineral processing process. In addition to comprising the processes of roughing, fine selecting for at least five times and scavenging, the low-grade fluorite silicon reduction mineral processing process is characterized in that a regrinding process is added after first fine selection, and inhibitors are added into the second fine selection and the fourth fine selection. Accordingly, the invention can effectively separate quartz from fluorite and effectively prolong the medicine effect time, has the advantages of easiness of manufacture, convenience in use and obvious effect, can favorably improve the floating environment, reduce the influence of slurry on fluorite flotation and greatly improve the fluorite concentrate grade and is especially suitable for silicon reduction mineral processing of low-grade fluorite mineral.

Disclosed is a copper powder which has a good balance between oxidation resistance and electrical conductivity in spite of having a small grain size. Also disclosed is a copper powder for use in an electrically conductive paste, which is reduced in the variations in shape or grain size and has a low oxygen content. Further disclosed is an electrically conductive paste. In the copper powder for an electrically conductive paste, Si (silicon) is contained in the inside of each particle at a content of 0.1 to 10 atm%.

A method of production of Zinc dust, which includes melting Zinc products in a melting furnace on a semi-continuous basis, transferring at least a part of the molten Zinc products to a vaporizing furnace, vaporizing the molten Zinc in the vaporizing furnace into Zinc vapour on a substantially continuous basis, transferring Zinc vapour from the vaporizing furnace to a condenser, and condensing the Zinc vapour to form Zinc dust and cycling the Zinc vapour in the condenser and making the Zinc vapour pass through a cyclone type cooler. A Zinc dust production device includes a vertical crucible melting furnace (12), a vertical crucible vaporizing furnace (14), a condenser (18) in fluid flow communication with the vaporizing furnace for receiving Zinc vapour into the condenser, wherein the condenser is provided with a heat exchanger in the form of a vapour cycle system (58).

The invention discloses a rare-earth nanometer metasilicate red fluorophor and the method for preparation. It contains the following setups: dissolving sensitizer activator substrate yttrium oxide in norbiline (or azotic acid), pressure-reduced distilling to eliminate water and excess acid, adding alcohol to prepare clear and transparent solution, and adding substrate silicon material to prepare transparent sol, pressure-reduced distilling to eliminate alcohol and acquiring powder solid, and adglutinating in 550-750 Deg. C by 2-4 hours to prepare the product. It prepares rare-earth nanometer red fluorescent powder in a low temperature (600 Deg. C) and a short time (3 hours), the average grain diameter being about 60-80 nm, the luminous intensity strong, chemical and optical property stable, the material easily obtained and cheap. Chemical expression formula of the rare-earth nanometer red fluorescent powder is as following: (YxSiy0z: Euj, Mn.

The invention provides a method for rapidly preparing AlON ceramic powder by means of carbon thermal reduction. The method takes low-cost gamma-Al2O3 powder and a carbon source, uniformly mixing the raw materials by means of wet-process ball milling, then drying and putting the raw materials in a zirconium oxide crucible, conducting a high-temperature carbon thermal reduction nitridation reaction at the high-pressure nitrogen atmosphere of 0.1-1MPa, quickly synthesizing the AlON powder, and then removing carbon at the low temperature of 500-900 DEG C to obtain the superfine, high-purity and uniformly dispersed single-phase AlON powder. Compared with the prior art, rapid sintering and carbon thermal reduction are combined under the condition of high nitrogen pressure, so that the activity of the AlON powder is improved, the preparation process is simplified, the preparation cost is lowered, and the method has an excellent industrialized application prospect.

The invention discloses a selective flocculation-column flotation recovery method and system of micro-fine particle molybdenum cleaner tailings. The method includes the following steps that: a dispersing agent and a collecting agent are added, so that first stirring and pulp conditioning is performed, and therefore, mineral particles can be fully dispersed, and the surface hydrophobicity of target mineral particles can be improved; a flocculating agent and a foaming agent are added, so that second stirring and pulp conditioning is performed, and therefore, the target mineral particles can be flocculated selectively; the cyclonic-static fine bubble floatatation column is utilized to perform copper-molybdenum mixed floating, and a roughing-concentration-scavenging floatation process is adopted, and as a result, copper-molybdenum mixed floated concentrates and tailings can be obtained; an inhibitor is added in the copper-molybdenum mixed floated concentrates, so that third stirring and pulp conditioning is performed; and the cyclonic-static fine bubble floatatation column is utilized to perform copper-molybdenum separation, and a roughing-concentration floatation process is adopted, so that molybdenum concentrates and copper concentrates can be obtained. According to the selective flocculation-column flotation recovery method and system of micro-fine particle molybdenum cleaner tailings of the invention adopted, two kinds of micro-fine particle separation ways, namely, selective flocculation and column flotation, are adopted to recover molybdenum and copper in molybdenum concentrates and tailings, and therefore, the comprehensive utilization rate of mineral resources can be improved, and the selective flocculation-column flotation recovery method and system have excellent economic benefits and social benefits.

The invention discloses a manufacturing method of anion far infrared acrylic fibre yarn, which is characterized by the following: adding 20: 1-1: 80 super-fine nanometer titanium oxide and tourmaline composite particle additive at 0.1-6 percent (o.w.f) in the polyacrylonitile flux weight. The invention can produce H3O2- ion and far-infrared electromagnetic wave, which purifies air and modifies environment to keep healthy for people.

The invention discloses a train running monitoring system station data production method and system based on imaging, thus realizing the accuracy and intuitiveness of station data, and overcoming the defect that the existing data production way is abstract with lots of repeated and inaccurate data. According to a technical scheme, the method comprises the following steps: drawing a station plan; setting working line information of various lines in the station plan; adopting rail junctions and signal machines as segmentation points, and segmenting station tracks and junction lines in the plan into a plurality of line sections connected with one another; setting a starting mileage of each line section; producing corresponding basic data on the line section on the basis of the working line information; and combining the data of the line section by which a train passes according to a train joint route and a train depart route of the train to form train joint access data and train depart access data of various rail tracks.

The invention discloses a semiconductor emitting material that is stimulated by near ultraviolet or ultraviolet. The constituents are ZnO: Sx, My and 10-4<=x<=10-2, 0<=y<=0.2. M is selected from Li, Na, K or rare earth of Eu, Tb. When M is Na, it has better emitting effect. The invention also discloses the manufacture method and the performance testing result. The invention has strong absorption near 370-440nm wavelength ultraviolet and blue light zone, and has strong emission between 450-600nm wavelengths. It could be used in LED and LD.

The invention belongs to the related technical field of internal combustion power fuel oil, and discloses a preparation device of dispersed-phase emulsified oil with an ultrafine particle size. The device comprises an emulsifying tank, a stirring mechanism, an ultrasonic emulsifying mechanism, a sliding mechanism and a temperature control mechanism, the tank body of the emulsifying tank is used for containing liquid to be subjected to micronization treatment, the stirring mechanism is arranged in the tank body, and is used for stirring liquid to be subjected to micronization treatment in the tank body, the sliding mechanism is arranged outside the tank body, is connected with the stirring mechanism, and is used for adjusting the height of the stirring mechanism in the tank body, the ultrasonic emulsifying mechanism is arranged below the tank body and is used for sending ultrasonic waves to conduct ultrasonic high-frequency shearing and smashing on the liquid to be subjected to micronization treatment in the tank body, and the temperature control mechanism is used for regulating and controlling the temperature in the tank body so that the requirements for surfactant activity and precise component content can be met; through the invention, the ultrafine particle size of the emulsified oil is realized, the micro-explosion of spray droplets is favorably realized, the oil-gas mixingis promoted, the combustion efficiency is improved, and the emission of harmful gas is reduced.

A laser 3D printing method for an in-situ synthesized alumina particle reinforced nickel base composite comprises the steps that firstly, nickel base alloy and pure aluminum powder are subjected to mechanical ball milling, particle size screening is carried out on the powder obtained after ball milling, and a laser 3D printing technological window is initially optimized; a temperature changing curve of a molten pool is recorded regularly with a colorimetric pyrometer, and the average peak temperature T of the temperature curve, the intercept t of the solid phase line and the temperature curveand the average cooling rate Xi of the molten pool are extracted and calculated; and technological parameters are optimized according to the principles that T is higher than or equal to 1.4 Tm and lower than or equal to 1.8 Tm, t is larger or equal to 0.55 s and smaller than or equal to 0.95 s and Xi is larger than or equal to 3.5*103 DEG C/s, and an optimized technological window is obtained, wherein the laser output power is 800-1200 W, the defocusing amount is -2.5 mm, the diameter of a laser spot is 2-3 mm, the scanning speed is 8-14 mm/s, and the powder feeding amount is 12-16 g/min. By means of the laser 3D printing method, in-situ synthesis of alumina particles can be achieved in the forming process, and the mechanical performance of nickel base forming parts can be improved.

The invention relates to a method for preparing YAG-Ce phosphor by using a combustion method. The method comprises: weighing a cosolvent, a combustion agent, and raw materials for preparing YAG-Ce phosphor; dissolving the raw materials in water; heating to a temperature of 80 DEG C, heating to a temperature of 300 DEG C by using a muffle furnace, carrying out thermal insulation for 3-6 h, carrying out calcining thermal insulation for 3-6 h at a temperature of 800 DEG C, and carrying out water washing or acid washing, suction filtration and drying; and placing the dried precursor under a reducing atmosphere, carrying out calcining thermal insulation for 3-6 h at a temperature of 900-1400 DEG C, cooling, taking out, and screening so as to obtained the required phosphor. According to the present invention, the starch or cellulose powder is adopted as the combustion agent, the combustion method is used to manufacture the YAG-Ce phosphor, the reaction temperature is lowered to about 900 DEG C from the traditional 1400-1700 DEG C, the obtained reaction product has characteristics of regular morphology and good uniformity, the method has characteristics of low temperature synthesis, simple process, low energy consumption, low equipment requirements and the like, and the phosphor has good light-emission intensity and is used for white light LED light source.

The invention discloses a solid phase interface induced precipitation method for preparing nickel oxide, cobalt oxide powder, which comprises preparing 0.01-2.0mol/L solution from the soluble metal salt of the oxides to be prepared, charging macromolecular dispersing agent by the ratio of cobalt or nickel content of 0.1-1%, weighing oxalic acid or oxalates solid powder by the ratio of 1-1.2 times of metal cobalt or nickel, grinding and sifting, charging in within one time or for several times, controlling the reaction temperature to be 25-90 deg. C, adjusting pH to be 1.0-5.0, agitating at the speed of 100-300 mps, reacting and ageing 0.5-3 hours, producing insoluble metallic oxalate powder, finally 4-12 hours at 350-1000 deg. C, thus metallic oxide powder is prepared.

The invention relates to a method for directly preparing high-purity white carbon black from fluorine-containing silicon slag. The method comprises the following steps: homogenizing, pulping and dispersing fluorine-containing silicon slag to disperse aluminum hydroxide powder wrapped by solid white carbon black particles so that the dispersed aluminum hydroxide powder reacts with fluosilicic acidadsorbed by the solid white carbon black to produce a water-soluble aluminum fluoride solution and a solid silicon dioxide material, removing an acid liquor containing aluminum fluoride, and carryingout homogenizing pulping, dispersing and ultrasonic fine washing on the obtained solid silicon dioxide material at least one time until washing water is neutral, and dehydrating and drying the neutralsilicon dioxide material to obtain the high-quality white carbon black. The method is simple, practical and capable of achieving industrial production, the SiO2 content (by dry basis) of the preparedwhite carbon black is greater than or equal to 92%, NSA is greater than or equal to 200 g/m<2>, the particle size is smaller than or equal to 0.044 micrometers, and the total iron content is smallerthan or equal to 0.01%, and other technical indexes all meet or exceed the national industrial standard HG/T3061-2009 requirements of precipitated white carbon black.

The invention provides a composite additive for strengthening high magnesium-type laterite-nickel ore direct reduction and an application of the composite additive. The composite additive comprises, by weight, 25-35% of desulphurization gypsum, 20-30% of sodium carbonate, 10-15% of sodium humate, 10-15% of polyacrylamide, 5-10% of coal powder, 5-10% of calcium oxide and 1-5% of iron powder. According to the composite additive for strengthening high magnesium-type laterite-nickel ore direct reduction, high-nickel concentrate can be prepared from high magnesium-type middle-low grade laterite-nickel ore and can be applied to direct reduction of high magnesium-type laterite-nickel ore. The application method of the composite additive comprises the steps that laterite-nickel ore and the composite additive are mixed, and a fresh pellet is obtained through pelletizing; the fresh pellet is dried, so that the fresh pellet is solidified to be a dried pellet, wherein the strength of the dried pellet exceeds 300 N; the dried pellet is placed into a rotary kiln, reduction coal is added into the rotary kiln to conduct segmented reduction, and a reduced product is obtained; and after water quenching and splat cooling are conducted on the reduced product, crushing ball-milling and wet magnetic separation are conducted, and high nickel iron ore concentrate is obtained.