279results about "Calcination" patented technology

The present invention relates to a metal nanocomposite powder reinforced with carbon nanotubes and to a process of producing a metal nanocomposite powder homogeneously reinforced with carbon nanotubes in a metal matrix powder.

The invention discloses a process for material treatment, which includes the step of subjecting used siliceous material to heat to obtain treated siliceous material. The process may be used to recycle used siliceous material. The invention also discloses a material treatment apparatus for treating used siliceous material, which includes heating means for heating used siliceous material to obtain treated siliceous material. The used siliceous material may be perlite and/or diatomaceous earth.

Disclosed are porous silica-based particles having high surface smoothness, a method for producing the porous silica-based particles, and a cosmetic comprising the porous silica-based particles. The porous silica-based particles have an average particle diameter of 0.5 to 30 μm and have a surface smoothness of a level to such an extent that, when the entire surface of the particle is observed from a photograph thereof taken by a scanning electron microscope (SEM) with a magnifying power of 10,000, a foreign matter attached to the surface thereof can be hardly seen.

The present invention is directed to a method of producing nano-size graphene-based material and an equipment for producing the same. The present invention provides a method of producing graphitic oxide by forcing graphite sulfuric slurry and KMnO₄ sulfuric solution into a lengthy micro-channel and by sustaining the mixture of the said graphite sulfuric slurry and the said KMnO₄ sulfuric solution in the said micro-channel at predetermined temperatures, by putting the said aqua solution of hydrogen peroxide to the reaction mixture to terminate oxidation, and by washing and drying the reaction mixture. The present invention provides a method of producing nano-size graphene-based material by exfoliating graphitic oxide by thermal shock in a vertical fluidized furnace. According to the present invention, graphitic oxide can be produced massively without risks of explosion by forcing all reagents as liquid phase continuously into a lengthy micro-channel surrounded and thermally controlled strictly by heat exchangers. Nano-size graphene-based material derived by exfoliating thus produced graphitic oxide can be imported into compositions and composites for various uses since it has physical characteristics comparable to carbon nanotube and dispersibility superior to carbon nanotube via residual functional groups.

Process and apparatus for the thermal treatment of pulverulent substances, in which the pulverulent substance is dispersed in a carrier gas and is passed in a continuous manner through a heated reactor where it is thermally treated and is then quenched by a cooling medium and is collected in a gas-solids separating unit.

An optical network (10) comprising an optical network element (12) comprising a first optical transmitter (14), a first controller (16), an optical receiver (18), a second optical transmitter (22), a second controller (24) and optical receiver apparatus (26). Said first controller is arranged to control said first optical transmitter to generate and transmit a first optical signal in response no second optical signal being detected. Said first controller is arranged to iteratively generate and transmit said first optical signal at different wavelengths of a plurality of wavelengths until said second optical signal is detected, and is further arranged to subsequently maintain generation and transmission of said first optical signal at said wavelength at which said second optical signal is detected. Said second controller is arranged to control said second optical transmitter to generate and transmit said second optical signal following detection of said first optical signal by said optical receiver apparatus.

The present invention discloses a continuous calcination vessel which can be used to prepare calcined chemically-treated solid oxides from solid oxides and chemically-treated solid oxides. A process for the continuous preparation of calcined chemically-treated solid oxides is also provided. Calcined chemically-treated solid oxides disclosed herein can be used in catalyst compositions for the polymerization of olefins.

The present invention disclosed preparation method of a visible-light-driven CC@SnS₂/SnO₂ composite catalyst, and application thereof, comprising the following steps: preparing CC@SnS₂ composite material in a solvent by using SnCl₄.5H₂O and C₂H₅NS as raw materials and carbon fiber cloth as a supporting material; calcining said CC@SnS₂ composite material to obtain the visible-light-driven CC@SnS₂/SnO₂ composite catalyst. The present invention overcomes defects of the traditional methods of treating chromium-containing wastewater, including chemical precipitation, adsorption, ion exchange resin and electrolysis, and the photocatalytic technology can make full use of solar light source or artificial light source without adding adsorbent or reducing agent. In this case, the use of semiconductor photocatalyst to convert hexavalent chromium in chromium wastewater into less toxic and easily precipitated trivalent chromium greatly reduces the cost and energy consumption.

The invention belongs to the technical field of green preparation of environmental-friendly catalysts, discloses a preparation method and application of a mesoporous FeCu-ZSM-5 molecular sieve, and particularly relates to a method for synthesizing the mesoporous FeCu-ZSM-5 molecular sieve through a one-pot method, and the application of the mesoporous FeCu-ZSM-5 molecular sieve in selective catalytic reduction (SCR) denitration reaction. Two times of roasting carried out after demoulding and ion exchange are firstly combined into one, namely, through exchanging and one-time roasting the synthesized raw powder, the FeCu-ZSM-5 molecular sieve with the characteristics of wide temperature window, low cost, good hydrothermal stability, high SCR denitration activity and the like can be directlyprepared, the defects of complicated steps, high cost and high pollutant discharge of a traditional dipping or ion exchange method are overcome, and during the synthesis process, no meso(large)poroustemplate agent is used, and no post-treatment method is adopted to construct a mesopore, so that the method provided by the invention not only has the advantages of simple process, simplicity and convenience in operation and the like, and has favorable economic and environment benefits.

A method for the calcination of powdery or fine-particled plaster includes steps in which the plaster is subjected to a flash-calcination in a calcinator and then post-calcinated in a reaction vessel. The post-calcination is carried out in the reaction vessel by adding humid gas, the reaction vessel not being heated. This post-calcination takes place over a long period of time, that is at least 10 times, preferably 50-100 times longer than, the amount of time taken for flash calcination. Complete calcination can take place without expending additional energy, and the remaining dihydrate produced during the flash calcination is also transformed into semi-hydrate and undesired anhydrite fractions are reduced. The method ensures consistency in the product quality and also increases product quality. The temperature in the upstream calcinator can be lowered to save energy. The method can also be used to accelerate the ageing of calcined plaster.

The invention discloses a molybdenum-vanadium double-metal oxide catalyst and application of the same to chemical-chain dehydrogenation of light alkanes. The molybdenum-vanadium double-metal oxide catalyst has a molecular formula of Mo1Vy, wherein y represents a molar ratio of vanadium atoms to molybdenum atoms; the molybdenum-vanadium double-metal oxide catalyst is prepared by using a dipping method; and the Mo1Vy oxygen carrier is prepared through dipping, drying, calcining and tableting. When the loaded molybdenum-vanadium double-metal oxide is applied to the dehydrogenation reaction of light alkanes for preparation of olefins and a reaction temperature is kept at 450-550 DEG C, high-activity high-selectivity oxidative dehydrogenation of propane into propylene can be achieved, the conversion rate of propane is maintained at 30 -40%, and the selectivity of propylene is 80-90%. After the fresh oxygen carrier reacts with propane, the fresh oxygen carrier turns from a high valence stateto a low valence state; a low-valence-state oxygen carrier reacts with air or oxygen and is oxidized into a high valence state, and lattice oxygen is regained and is circulated again; and after repeated regeneration, the oxygen carrier still has stable reaction performance. The catalyst provided by the invention can be used in reaction units such as fixed-bed reactors, moving-bed reactors or circulating fluidized beds.

A molecular sieve has a silica/alumina molar ratio of 100-300, and has a mesopore structure. One closed hysteresis loop appears in the range of P/P₀=0.4-0.99 in the low temperature nitrogen gas adsorption-desorption curve, and the starting location of the closed hysteresis loop is in the range of P/P₀=0.4-0.7. The catalyst formed from the molecular sieve as a solid acid not only has a good capacity of isomerization to reduce the freezing point, but also can produce a high yield of the product with a lower pour point. The process for preparing the catalyst involves steps including crystallization, filtration, calcination, and hydrothermal treatment.

A system and method for the calcination of minerals. The system comprises a vertically disposed reactor segment configured to impart horizontal forces on particles passing through the reactor segment in a vertical direction; an injector unit for receiving granular feedstock, the injector unit being disposed at a top portion of the reactor segment, whereby granules of the feedstock move through the reactor segment in a granular flow under at least one of a group consisting of a force of steam, gravitational force and a centrifugal force; a reactor heat exchange unit thermally coupled to a wall of the reactor segment for providing heat to the flowing granules inside the reactor segment through heat transfer through the wall of the reactor segment; one or more inlets formed in the reactor segment for introducing a superheated gas into the reactor segment to create conditions of a gas-solid multiphase system; and one or more exhaust openings formed in the retort segment such that gas products are at least partially flushed from the reactor segment under the flow of the superheated gas from the inlets to the exhaust openings.

A carbon dioxide adsorbent may include a complex oxide including barium and titanium, wherein the complex oxide has a perovskite crystalline structure and is represented by the general formula Ba_xTi_yO_z, and an atomic ratio of Ba/Ti ranges from about 0.95 to about 1.7. The carbon dioxide adsorbent may be included in a carbon dioxide capture module. The carbon dioxide adsorbent may also be used in a method of separating carbon dioxide.

A method for processing vanadium-titanium magnetite finished ores by using a wet process. The method comprises the steps: extracting vanadium from vanadium-titanium magnetite finished ores and processing, by using the vanadium extraction method, obtained leaching residue by using a wet process, so as to obtain titanium; and calcining the remaining liquid extracted during the vanadium extraction, so as to prepare ferric oxide. The flow of the method is short, and the energy consumption is low, thereby avoiding waste of a titanium resource.

The invention discloses a powder multistage suspension preheating kiln outside calcium oxide calcining method. The powder multistage suspension preheating kiln outside calcium oxide calcining method comprises following steps: 1, limestone powder is introduced into a multistage suspension preheating kiln for preheating to 800 to 900 DEG C; 2, the pre-heated material is introduced into a decomposition furnace, and calcining is carried out for 25 to 35s at 900 to 1100 DEG C; 3, the calcined material is conveyed back into a rotary kiln, and is subjected to calcining for 25 to 35min at 1100 to 1300DEG C, and is cooled to obtain calcium oxide. According to the method, the step in the prior art that block limestone is subjected to direct calcining is changed into the above steps that limestone is crushed into powder, and suspension preheating, decomposition furnace calcining decomposition, and rotary kiln calcining slaking are adopted to prepare powdery calcium oxide, the single line production capacity is 5 to 10 times higher than that of the conventional method, and energy saving and environment protection are realized.

A process and an apparatus for converting solid organic materials into carbon or activated carbon. The processing of solid organic materials is oxygen-free and wholly under endothermic condition. The apparatus comprises a pressure vessel (1), thermal insulation with protective cladding for pressure vessel (2), a perforated or non-perforated rotary drum (3), a sealed dish end (4), a rotating shaft (5), a geared motor with belt or chain drive (6), a steam super heater (7) for generating superheated steam, at least one inlet valve (8) for regulating the super heated steam, at least one feed pipe (9), tilting or swivel support (10), at least one cylindrical roller (11), an open or close door end (12), a feeding or removal port (13), a connecting chute (14), at least one pressure safety valve (15), a gas exit pipe (16), at least one outlet valve (17), a gas treatment unit (18) for treating the generated reaction gases, at least one pressure gauge (19) and at least one temperature indicator (20). The pressure vessel is tilted along with its accessories supported on a tilting or swivel support and solid organic materials are feeded into the rotary drum and then realigned. Gas or steam is feeded inside the pressure vessel till the entire air inside the pressure vessel is purged out and thereafter superheated steam continuously feeded into the rotary drum. The rotary drum is constantly rotated by geared motor and generated reaction gases are evacuated from the pressure vessel to the gas treatment unit wherein the organic solid materials are converted into carbon or activated carbon.

In an aspect, a method for making a metal-containing material comprises steps of: forming a metal-containing hydrogel from an aqueous precursor mixture using a photopolymerization; wherein the aqueous precursor mixture comprises water, one or more aqueous photosensitive binders, and one or more aqueous metal salts; and thermally treating the metal-containing hydrogel to form the metal-containing material; wherein the metal-containing hydrogel is exposed to a thermal-treatment atmosphere during the step of thermally treating; wherein a composition of the metal-containing material is at least partially determined by a composition of the thermal-treatment atmosphere during the thermally treating step.

The invention features methods and systems for recovering carbon dioxide, for producing commercial quality carbon dioxide (CO₂) of 90% to +99% purity using, wet calcium carbonate lime mud produced in a recausticizing process that also produces caustic soda, for instance, Kraft paper pulp mill lime mud (a.k.a., “lime mud”) as a feedstock to a multi-stage lime mud calcination process. This process may be fueled with low, or negative cost “carbon-neutral” fuels such as waste water treatment plant (WWTP) sludge, biomass, precipitated lignins, coal, or other low cost solid fuels. High reactivity, high-quality calcined lime mud (a.k.a. re-burned lime, or calcine), required in the Kraft paper pulp mill's recausticizing process is also produced, and superheated high pressure steam and hot boiler feed-water is generated and exported to the mill's steam distribution and generation system as well as hot process water for use in the mill's manufacturing operation. The system for calcining calcium carbonate lime mud produced from a recausticizing manufacturing operation and converting it to calcined lime mud and CO₂ comprises a calciner and a combustor linked by a moving media heat transfer (MMHT) system or apparatus. The MMHT system or apparatus thermally links separate fluid bed combustion (exothermic) and calcination (endothermic) stages with a solid particulate media. The system further comprises a flash dryer or spray dryer that utilizes exhausted enthalpy from the calcination stage.