64results about How to "Calcination temperature is high" patented technology

The invention relates to a heat accumulating type double-hearth lime kiln. The heat accumulating type double-hearth lime kiln comprises a feeding system, a discharging system, a combustion system, an air supply system, an exhaust emission system and two kiln bodies arranged in parallel, wherein each kiln body is respectively provided with a feeding port, a preheating zone, a calcining zone, a cooling zone and a discharging port; the two kiln bodies are communicated with each other through an annular channel on the upper parts of the cooling zones; a gas collecting device is arranged on the upper part of the preheating zone; an inserting type burner is arranged on the calcining zone; a cooled air inlet is formed in the cooling zone; a high-temperature calcining zone is arranged between the calcining zone and the cooling zone; the high-temperature calcining zone is provided with a fuel gas heat accumulator or 1 to 5 rows of fuel gas heat accumulating burners and 1 to 5 rows of combustion-supporting gas heat accumulating burners; and the fuel gas heat accumulating burners and the combustion-supporting gas heat accumulating burners are arranged at intervals and annularly arranged at the periphery of the kiln wall. The high-temperature calcining zone performs calcination in a secondary combustion manner, so that sulfur content of the calcined product is reduced and the quality of the calcined product is improved. The high-temperature calcining zone adopts the heat accumulating burners and utilizes oxygen for supporting combustion, thereby facilitating the improvement on intensity of combustion and reducing the energy consumption.

The invention relates to a calcining method for preparing aluminum-electrolytic pre-baked carbon anode petroleum coke, which is characterized in that calcination temperature is controlled at 1300-1350 DEG C; the fluctuation range of temperature is not larger than 30 DEG C; discharging amount is controlled by the volatile matter content in the petroleum coke, and the volatile matter is controlled in 10-15%; the secondary ventilation quantity of a rotary kiln is 2000-2600 m3/h, and the third ventilation quantity is 1600-2200m3/h; and negative pressure is controlled in 20- 40Pa. the invention causes a calcining process to obtain system optimization, the coke performance after calcination is greatly improved, the oxidation resistance and the electrical conductivity after calcination are significantly increased, and the true density is more than 2.05g/cm3. The produced anode quality is more uniform and stable, the ratio of first-grade products is significantly increased, and the electrolytic carbon consumption is greatly reduced.

The invention relates to a local oxygen-enriched combustor for a cement kiln furnace. Through the arrangement of an oxygen-enriched air passage outside an axial flow air passage of the combustor and the arrangement of a spray nozzle at an outlet of the oxygen-enriched air passage, the spray nozzle is arranged at the lower part of the outer side circumference of the air flow air spray nozzle and is near the clinker or analogue side, so the local concentration of the oxygen gas at the contact side of the lower part of the combustor and the oxygen-enriched air passage is raised, the combustion speed of the fuel can be accelerated, the local heat accumulation is directly caused, the adjacent fuel also begins to combust along with the proceeding of the diffusion, heat transfer and heat radiation processes, the temperature of the direct contact side of the clinker or analogue of a rotary kiln with the oxygen-enriched air passage is obviously raised, and the response to the raw material mass fluctuation caused by proportioning can be realized. In addition, a center angle corresponding to a distribution region in the circumferential direction is set to be smaller than or equal to 270 degrees, the angle range can completely cover the region of the fuel and the cement clinker or analogue rotating along with the rotary kiln, and the use precision and the economization of oxygen-enriched air can be ensured.

The invention discloses a petroleum coke calcining rotary kiln, which comprises a rotary kiln(9); an insert plate valve(1) is arranged below a calcining front chamber; an adhesive tape constant feeder(2) is arranged below the insert plate valve, and an adhesive tape conveyer(3) is arranged behind the adhesive tape constant feeder (2) and connected with the rotary kiln(9) by an oblique cutting feed tipping tube of an electric insert plate valve(6); the tail part of the rotary kiln(9) is connected with a dust deposition chamber(8), and the head part of the rotary kiln(9) is connected with a cooling machine(16) and provided with a burner nozzle(13) and a burner nozzle hanger(14); the petroleum coke calcining rotary kiln is also provided with a one-time combustion fan(10) matched with the burner nozzle; and a dust-containing waste gas processing system(15) is arranged beside the cooling machine(16). The petroleum coke calcining rotary kiln has the advantages of improving the unit volume capacity, greatly enhancing comprehensive utilization of waste heat and adaptability of other calcining materials such as needle coke, anthracite and the like, reducing burning loss of charcoal, saving raw materials and energy, improving automatization level and reducing labor intensity of a worker.

The invention discloses a metal oxide nanoparticle and a preparation method of the metal oxide nanoparticle, which comprises the following steps: preparing an organosol containing the metal element, mixing the organosol with a water-soluble salt, performing standing or centrifuging to precipitate the water-soluble salt, removing the superfluous organosol at the upper part, and keeping the temperature to convert the organosol into gel; along with evaporation of the solvent, shrinking the gel, and coating the surfaces of the water-soluble salt particles with a layer of xerogel film; and calcining the sample at a high temperature between 400 DEG C and a salt melting point, converting the dry gel film into metal oxide nanoparticles, dispersing and attaching the nanoparticles to the surfaces ofwater-soluble salt particles, cooling, and washing with water to remove the salt, thereby obtaining the high-dispersion metal oxide nanoparticles; if the calcined product is reduced in a reducing atmosphere, converting the metal oxide nanoparticles attached to the surfaces of the water-soluble salt particles into corresponding metal nanoparticles, cooling, and washing with water to obtain the high-dispersion metal nanoparticles. According to the method, the high-crystallinity and high-dispersion metal oxide and metal nanoparticles can be rapidly prepared in batches.

The invention discloses a preparation method for an early strength cement admixture containing red mud or coal gangue. The method includes: respectively mixing the red mud and the coal gangue or flue gas desulfurization gypsum and the red mud according to following proportions, by weight, 8:2-6:4 for the red mud to the flue gas desulfurization gypsum and 3:7-5:5 for the red mud to the coal gangue, grinding, calcining at a temperature of 600 to 800 DEG C, composing the red mud and the coal gangue with cement clinker and gypsum, or composing the flue gas desulfurization gypsum and the red mud with the cement clinker to obtain the composite admixture capable of improving early strength of cement paste. The composite admixture obtained by industrial wastes such as the red mud, the coal gangue has good economic and environmental benefits, and the early strength cement admixture is low in firing temperature and economical in energy resources, meets national strategic guidelines on energy conservation and environment protection and has good development prospects.

The invention relates to the field of titanium dioxide preparation, in particular to a production method of non-coating rutile type titanium dioxide. The method includes the steps of (1), selecting ofraw materials; (2), preparation of a titanium solution; (3), preheating of the titanium solution; (4), manufacturing of seed crystals; (5), adding of the seed crystals; (6), hydrolyzing; (7), flushing; (8), washing; (9), calcining. The acid-split titanium solution can be hydrolyzed without being concentrated, the energy consumption is low, a crystal form accelerant is added when the seed crystalsare prepared, the titanium dioxide can be converted into rutile in the production process, a high crystal form conversion accelerating effect is achieved, the calcining temperature is low, and damageto equipment is greatly relieved; by means of the two links that the crystal form accelerant is added when the seed crystals are prepared, and heat preservation is carried out for 3 hours after calcining is completed, it can be promoted that the produced titanium dioxide is converted into the rutile, the conversion rate of the rutile is high, and therefore the non-coating rutile type titanium dioxide with high rutile content is obtained.

The invention belongs to the technical field of preparation of inorganic nonmetal nanocomposite materials, and concretely relates to a preparation method of magnetic Fe2O3/Fe3O4 nano-heteroplasmon particles. The method adopts metal iron salt, alcohol and an alcohol-soluble organic matter as raw materials, and comprises the following steps: adding the iron salt to alcohol or the alcohol-soluble organic matter according to a ratio of the iron salt to the alcohol of 1mol/7mL or less, stirring for dissolving to prepare a sol solution, igniting and combusting the sol solution in air to prepare a gel, calcining the gel at 150-450DEG C under a heating rate of 0.5-15DEG C/min for 0.1-12h, and naturally cooling to prepare the magnetic Fe2O3/Fe3O4 nano-heteroplasmon particles. The preparation method has the advantages of simple technology, convenient operation, easy process control, wide sources of the raw materials, low cost, environmental protection, low requirements on a required device, uniform diameter distribution of the particles, and convenience for large-scale industrial production. The microstructure and the morphology of the particles can be conveniently controlled by adjusting process factors and the chemical composition in order to control the performances of the particles.

The invention discloses an energy-saving and environment-friendly cement clinker preparation system, which includes a raw material preparation system, a raw material homogenization system, a fed raw material conveying system, a cement and pulverized coal preparation system and a cement clinker calcination system, wherein a material outlet of a loading bucket elevator is connected with a material inlet of a raw material homogenization air conveying chute; a material outlet of an unloading chain conveyer is connected with material inlets of two unloading bucket elevators respectively; a material outlet of a raw material feeding spiral conveyer is connected with a material inlet of a preheater; a material outlet of a spiral pneumatic conveying pump is connected with a material inlet of a decomposition furnace; a material outlet of another spiral pneumatic conveying pump is connected with a material inlet of a four-passage pulverized coal combustion device; a hot air outlet of an air-beam type grate cooler is connected with an air inlet of an air-swept coal mill; one material outlet of an electric tee scraper-trough conveyer and a material outlet of a kiln tail dust collection spiral conveyer are both connected with a material inlet of a re-homogenization loading chain conveyer. The system has the advantages as follows: the yield of the clinker is increased, the energy consumption is lowered, the emission is reduced, the quality of the clinker is improved, and the quality of the cement is stable.

The wavelength conversion element includes a phosphor layer having a plurality of phosphor particles and a binder configured to bind one of the phosphor particles adjacent to each other and another of the phosphor particles adjacent to each other out of the plurality of phosphor particles, and a substrate provided with the phosphor layer, wherein the binder includes glass, and the binder binds a part of a surface of the one of the phosphor particles and a part of a surface of the another of the phosphor particles to each other.

The invention discloses a novel method for reducing nitrogen oxide emission through preheating calcination. The method comprises the following steps of: (1) air supply: preheating fresh air through anair preheater and then feeding the preheated fresh air into a calcination chamber; (2) drying: before calcining, drying a raw material and pulverized coal through high-temperature airflow to reduce the water content of the raw material and the pulverized coal; (3) preheating: preheating the dried raw material and pulverized coal by secondary air, mixing tail gas and air to reduce the air oxygen content of the secondary air, and generating a certain amount of combustible gas with reducibility such as CO to reduce NOx generated through pyrolysis; (4) calcining: calcining the preheated raw material and pulverized coal at high temperature; and (5) cooling: forming clinker from the calcined raw material and pulverized coal, cooling the clinker, and entering the next process. The problems of high consumption of ammonia water and high denitration cost in flue gas denitration treatment corresponding to clinker production are solved.

The invention relates to a preparation method for a Ca-Bi-O series visible-light photocatalysis material, and belongs to the technical field of inorganic nano materials. The preparation method comprises the steps of preparing a precursor by using a chemical solution method and annealing for 10 to 15 hours at the temperature of between 450 and 800 DEG C. The method for preparing the Ca-Bi-O series visible-light photocatalysis material by using the chemical solution method through even reaction overcomes the defect of high reaction temperature in the prior art, and can obtain single-phase or heterogenous compound photocatalysis functional materials by controlling the annealing temperature respectively. The method has the advantages of simple operation, easy reaction control and good repeatability; and the obtained heterogenous compound photocatalysis functional material has remarkably-improved photocatalysis activity.

The invention relates to a blue fluorescence luminescent material and a preparation method thereof, pertaining to the technical field of luminescent material. The technic proposal adopted by the invention is to prepare strontium phosphate barium stone, of which a chemical formula is M(Srx, Ba1-x)PO4:Eu, wherein, M is equal to Li+, Na+, K+, Rb+, x is equal to 0-1, doping content of rare earth element europium (Eu2+) is 0.0005-10 percent mol of the total amount of strontium and barium. An excitation field of the invention tallies closely with vacuum uv (VUV) generated by ionomer such as mixed gas of xenon and ne (Xe plus Ne) which is applied presently. Excited by vacuum uv less than 200nm, the invention emits blue fluorescence; the invention has high crystallinity, good luminescent quality, low cost, simple preparation technique and no pollution and is especially applicable to ionomer plate displaying technology and luminescent and displaying devices with vacuum uv as an excitation source, such as a noble gas discharge lamp, etc.

The invention relates to a high-nickel positive electrode material with a reconstructed surface layer and a preparation method thereof, and belongs to the field of chemical energy storage batteries. The chemical formula of the material is Li(Ni<x>Co<1-x>)<1-y-z>M<y>N<z>O<2>, x is larger than 0.7 and smaller than 1, y is larger than 0 and smaller than or equal to 0.1, z is larger than 0 and smallerthan 0.1, the ratio of y to z is m:1-m, and m is larger than 0.6 and smaller than 1. According to the material, a layered nickel-cobalt positive electrode material is used as a matrix, metal elementsM and N are doped in the surface layers of primary particles of the matrix, and the outermost layer of the surface layers of the primary particles is a rock salt phase NiO thin layer. Surface layer doping is performed on the high-valence metal element M and the trivalent metal element N after high-temperature calcinations to enable more Ni on the surface layer to exist in the form of Ni<2+> by utilizing a charge compensation effect, and a rock salt-like phase NiO thin layer is formed on the surface layer of the primary particle, direct contact between the material and an electrolyte can be effectively isolated, and irreversible phase transformation of the material is inhibited, so that the cycling stability of the material is improved.

The invention provides a method for preparing yttrium aluminum garnet nanoparticles, which comprises the following steps: preparing organic sol containing aluminum and yttrium, mixing the organic solwith water-soluble salt, performing standing or centrifuging to precipitate the water-soluble salt, removing superfluous organic sol at the upper part, and keeping the temperature to convert the organic sol into gel; along with evaporation of the solvent, contracting the gel, and coating the surfaces of the water-soluble salt particles with a layer of xerogel film, and calcining a sample at a hightemperature between 600 DEG C and a salt melting point, converting a dried gel film into yttrium aluminum garnet nanoparticles, dispersing and attaching the yttrium aluminum garnet nanoparticles to the surfaces of water-soluble salt particles, cooling, and washing with water to remove the salt, thereby obtaining the yttrium aluminum garnet nanoparticles with favorable dispersity and crystallinity. According to the method, the high-dispersion and high-crystallinity yttrium aluminum garnet nanoparticles can be rapidly prepared in batches, and the method is suitable for preparing LED fluorescentpowder, YAG transparent ceramic and other materials.

The invention provides a preparation method of colored magnetic pearlescent pigment, and relates to the technical field of pigment. The method comprises the following steps: weighing 100 g of a pretreated base material, adding 1000 ml of distilled water, adjusting the pH value to 1.9-2.1, heating to 70-80 DEG C, adding a titanium tetrachloride solution until different colors appear, stopping stirring for 30-45 min after addition is finished, heating to 72-82 DEG C, and adding an alkali to adjust the pH value to 8.9-9.2; adding 0.2-0.5 mol/l of a sodium silicate solution, stopping stirring for30-45 minutes, and adding hydrochloric acid to adjust the pH value to 3.3-3.5; adding a ferric trichloride solution, stopping stirring for 30 minutes after addition is finished, and adding alkali to adjust the pH value to 7.5-8.0; and adding a ferrous chloride mixture, stopping feeding when the magnetism is strongest, performing filtration, washing and drying to obtain a finished product. The colored magnetic pearlescent pigment prepared by the preparation method is high in quality and outstanding in stability and has remarkable magnetic conductivity.

The invention discloses a preparation method of a magnetoplumbite type CH4-CO2 reforming catalyst. According to the preparation method, alkaline sodium aluminate NaAlO2 is taken as an aluminum source, nickel nitrate Ni (NO3)2 is taken as a nickel source, strontium nitrate Sr (NO3)2 is taken as a strontium source, a nickel strontium aluminate precipitation copolymer is obtained with an ultrasonic copolymerization method, a hydrothermal reaction is performed for 16-20 h at the temperature of 160-180 DEG C, a pre-crystallization body with a magnetoplumbite structure is prepared, finally, crystallization sintering is performed for 6-8 h at the lower temperature of 750-850 DEG C, and a magnetoplumbite-structured SrNiAl11O19 reforming catalyst material with higher purity and good crystallization condition can be prepared.

The invention discloses a high-temperature structural ceramic preparation machine, which structurally comprises a placement box, a supporting plate, a workbench, a preparation box, a handle and a boxdoor, wherein the bottom of the placement box is welded to the top of the supporting plate, and the lower end of the supporting plate is welded to the upper surface of the workbench. According to theinvention, heat is conducted into a transmission pipe through a pipeline and is conducted through hot air of a conduction rod in a sealed mode, so that the outer side of a forming cavity is subjectedto high temperature more uniformly, and the overall calcining temperature of a ceramic sealing ring is increased; after an extrusion mechanism completely enters a box body, and an opening and closingplate is automatically closed, so that the high-temperature loss in the forming device is reduced; an extrusion round block is subjected to extrusion buffer adjustment through a spring, so that the extrusion round block is prevented from generating excessive extrusion force on the formed ceramic sealing ring; and a sliding outer ring abuts against the ceramic sealing ring through upward lifting ofan air cylinder and downward pressing of the sliding outer ring, and the ceramic sealing ring is prevented from falling off from the extrusion round block, so that the ceramic sealing ring is prevented from being embedded in the outer side of the extrusion round block.

The invention belongs to the technical field of composite material preparation, and discloses preparation of a ZnMn2O4/Mn2O3 composite material and a method for testing the electrochemical performanceof the ZnMn2O4/Mn2O3 composite material. The preparation method of the composite material comprises the following steps: dissolving KOH and NaOH with deionized water to prepare a solution A; pouring0.5 mol/L of Zn (CH3COO) 2 solution into 1.0 mol/L of Mn (CH3COO) 2 solution to prepare a solution B; dropwise adding the solution A into the solution B; transferring the mixed solution into a high-pressure kettle, reacting at 180 DEG C for 24 hours, naturally cooling to room temperature, and centrifugally separating a product; and placing the centrifuged substance in a tubular furnace, calciningfor 5 hours at 500 DEG C in an air atmosphere, and naturally cooling. By comparing the impedance curves of the material before and after charging and discharging, the material has good stability, andan electrochemical test shows that the material has good rate capability and cycle performance.