16 results about "Oxidative pyrolysis" patented technology

The invention provides a method and a system for strengthening sludge treatment and nanometer material co-production through synergy of electrochemistry and ozone catalysis, and application of the method and the system, and relates to the technical field of environmental governance and resource recovery, in particular to the method for strengthening sludge treatment and nanometer material co-production through synergy of electrochemistry and ozone catalysis. Comprising the following steps: (a) performing electrochemical catalytic oxidation treatment on sludge slurry; (b) pyrolyzing the sludge treated in the step (a) to obtain volatile components; and (c) converting the volatile component into nano silicon dioxide through a vapor deposition reaction. According to the electrochemical-ozone catalysis synergistic enhanced sludge treatment and nano material co-production method provided by the invention, electrochemical catalytic oxidation, pyrolysis and vapor deposition processes are organically integrated, so that efficient removal of pollutants in sludge and synchronous conversion of high-value nano materials are realized.

The application discloses an experimental device for studying gas generation and seepage of an in-situ combustion front of an oil reservoir, comprising a rotating assembly, a combustion assembly, an injection assembly, an observation assembly and a separation and detection assembly, wherein the combustion assembly is arranged on the rotating assembly, the injection assembly is communicated with the combustion assembly, the observation assembly is arranged on the combustion assembly to observe the generation and seepage of the gas of the in-situ combustion front of the oil reservoir, and the separation and detection assembly is connected with the combustion assembly to detect the generated hydrogen. Through the cooperation of the observation assembly and the combustion assembly, the gas seepage condition generated by the oxidative pyrolysis reaction in the combustion assembly can be directly observed by the experimental personnel in the experiment, and the experimental error is avoided, so that the actual engineering condition can be fitted.

The present application relates to a kind of nitrogen-doped fibrous carbon materials and its preparation method and application.The preparation method uses animal feather as raw material, and the transformation of keratin macromolecule from chain structure to cross-linked structure is carried out by mild condition oxidation-pyrolysis coupling reaction, which significantly improves the thermal stability of animal feather material.On this basis, the animal hair material can maintain high nitrogen doping level during subsequent pyrolysis process, compared with the carbon material obtained by direct pyrolysis of the original animal feather material, the retention rate of nitrogen and carbon elements is significantly improved.The lithium-sulfur battery positive electrode modification coating prepared by the keratin-based nitrogen-doped fibrous carbon material prepared by the present application effectively improves the rate performance and cycle stability of lithium-sulfur battery.

The utility model discloses a biomass fluidized bed gasification system suitable for a downstream conversion device. The biomass fluidized bed gasification system comprises a fluidized bed gasification furnace, a cyclone separator, an oxidation cracking furnace, a venturi scrubber, a cyclone hydraulic separator and a water scrubber, the fluidized bed gasification furnace, the cyclone separator, the oxidation cracking furnace, the venturi scrubber, the hydrocyclone and the water scrubber are sequentially connected along the flow direction of synthesis gas to form a synthesis gas flow route; the system disclosed by the utility model adopts a chilling process, the water-vapor ratio can be about 0.8, a downstream conversion device does not need to be supplemented with water vapor, the consumption and the investment are saved, and the fluidized bed gasification furnace has a high-temperature oxidation area, so that tar can be fully cracked, and the energy consumption is reduced. The tar content at the outlet of the fluidized bed gasifier is effectively reduced or no tar exists at the outlet of the fluidized bed gasifier.

This invention discloses a method for preparing artificial soil from solid waste, belonging to the field of solid waste resource utilization technology. The preparation method includes first subjecting mixed solid waste to pre-oxidative pyrolysis and alkali-assisted high-temperature activation, then generating Ca-Mg-Al layered double hydroxide (LDH) in situ under gradient alkaline regulation, followed by granulation with composite nutrients and carbon source and pulsed wet curing to obtain artificial soil with high water stability, low risk of heavy metal migration, and synergistic fast-acting and slow-release fertilization. The artificial soil product of this invention has a TCLP-Pb ≤ 2.8 mg L⁻¹ and a water-stable aggregate content of > 0.25 mm of 80–86%, suitable for mine revegetation, slope greening, and saline-alkali land improvement. The preparation method of this invention fully utilizes the active components of coal-based solid waste and achieves carbon sequestration, improving resource utilization efficiency and ecological benefits.

This invention provides a method for preparing carbon quantum dots from petroleum coke, relating to the field of carbon nanomaterials technology. The method includes calcining petroleum coke and then subjecting it to adaptive oxidative pyrolysis with an additive containing phosphotungstic acid, an ionic liquid, and hydrogen peroxide; nitrogen doping; and surface stabilization treatment with a stabilizer composed of sodium hyaluronate, poloxamer 188, and sodium citrate; finally, carbon quantum dots are obtained by pH adjustment flocculation, centrifugation, dialysis, and drying. This method achieves efficient and green conversion of petroleum coke under mild conditions through the synergistic effect of specialized additives and stabilizers. The prepared carbon quantum dots have the advantages of high fluorescence quantum yield, good dispersion stability, and high yield, providing a new approach for the high-value utilization of petroleum coke.

The invention concerns an integrated process of slow oxidative pyrolysis (SOP) of an organic material, e.g. biomass, and an anaerobic co-digestion (AD) process of the aqueous phase of APL pyrolysis in order to enhance the production of biomethane.

The application discloses a preparation method of a graphene nanosheet layer oxidation intermediate, which comprises the following steps: 1 part of graphite powder particles is placed in a pure oxygen sealed container, and the sealed container is heated to 600-1200 DEG C, and then ultrasonic pulses are emitted into the sealed container to prepare oxidized pyrolytic graphite; the oxidized pyrolytic graphite is stirred and mixed with 40-100 parts of concentrated sulfuric acid, and then 1 part of an expanding agent, 1 part of a water absorbing agent and 2-8 parts of an oxidizing agent are added to react, and the reaction product is cooled to room temperature after the reaction is completed; a pH stabilizer is added dropwise into the above reaction product, and stirring is conducted to obtain a precipitate, and the precipitate is washed and dried. The application further discloses the graphene nanosheet layer oxidation intermediate prepared by the above preparation method; the oxidation intermediate has very high reaction activity, is easy to transport and store for a long time, can be used as a reaction precursor of novel high-performance materials such as graphene oxide, sulfur-graphene oxide and nitrogen-graphene oxide, and has unique advantages in large-scale synthesis of graphene-based high-performance nanomaterials.

A kind of gold cyanidation tailings resource and harmless treatment method, belong to mineral processing technical field, including steps (1) the cyanide tailings of gold smelting enterprise cyanidation leaching process gold extraction after pressure filtration dehydration;(2) the cyanide tailings after dehydration into to suspension furnace and carry out preheating dehydration, toxic and harmful substances in tailings are destroyed at high temperature oxidation, pyrolysis, cyanide tailings can remove all or part of the attached water after this process;(3) the cyanide tailings after preheating roasting treatment enter the inside of reactor and carry out oxidation roasting, get de-cyanation tailings after oxidation roasting treatment;(4) the de-cyanation tailings after cooling enter electric furnace smelting, this process further smelt de-cyanation tailings into water slag and pig iron, water slag can be used as building material and cement after treatment, pig iron can be used for steelmaking cast iron after treatment.The cyanide is not detected in cyanide tailings after the method of the application, and the gold tailings resource and harmless are truly realized.

A pressurized oxidative pyrolysis system comprising a vessel configured to contain a solid feedstock and a gas phase; a gas inlet in fluid communication with the vessel and configured to introduce an oxidizing gas into the vessel at an initial pressure; a heating assembly thermally coupled to the vessel and configured to raise a temperature of the solid feedstock while the vessel remains closed; and a product outlet configured to permit removal of a carbonaceous solid product from the vessel after heating, wherein an exothermic reaction between the oxidizing gas and the solid feedstock during heating supplies heat for conversion of the solid feedstock to the carbonaceous solid product.

The invention discloses a coal gangue and high-humidity organic solid waste coupling self-sustaining heat decarburization synergistic activation method, and belongs to the technical field of solid waste comprehensive utilization, and the method comprises the following steps: preparing a mixed material from coal gangue particles and high-humidity organic solid waste; distributing the mixed material in a self-sustaining heat decarburization reactor; the bottom of the material is preheated to trigger self-sustaining flameless combustion of the mixed material, a dynamic pyrolysis-oxidation front surface is formed, the dynamic pyrolysis-oxidation front surface is spread from bottom to top, and decarburization and activation of the mixed material are completed; and carrying out quenching treatment to obtain high-activity mixed ash. According to the method, a material pore structure and a heat value synergistic effect are utilized, and a fixed bed heat storage and oxidation-pyrolysis-drying integrated principle is combined, so that solid waste heat value complementation and activation synergy are realized, a self-sustaining heat reaction of a mixed material can be triggered only by a small amount of external heat, a relatively high reaction temperature can be maintained without additional fuel, and the energy consumption is reduced. Efficient decarbonization of the mixed material is achieved, the activity of the material is improved, efficient utilization of solid waste is achieved, and the solid waste utilization cost is reduced.

The present application relates to a kind of catalyst for medical waste salt melting organic flue gas cracking oxidation.The present application utilizes sol-gel method to load perovskite type metal oxide on silica-alumina molecular sieve, form the catalyst with cracking oxidation characteristics, and further load a layer of transition metal oxide on the above-mentioned catalyst by chemical reduction method, for regulating the cracking oxidation performance of catalyst.The catalyst prepared by the present application has abundant acid sites and oxidation sites, can crack macromolecular organic matter in medical waste salt melting organic flue gas into gaseous small molecules at lower temperature, and then oxidize completely into harmless substances by deep oxidation, effectively avoiding the problems of high purification temperature and low efficiency of medical waste salt melting organic flue gas;And low energy consumption, little secondary pollution, wide application range, can effectively replace the second combustion chamber to degrade macromolecular organic matter in medical waste salt melting organic flue gas, and the concentration of non-methane total hydrocarbon in purified tail gas is reduced to 40 mg / Nm 3 The following.

The invention relates to a multi-section oxidation pyrolysis cleaning and recycling process and system for an aluminum-plastic film soft package lithium ion power battery, and belongs to the field of waste lithium ion battery recycling. According to the process, after an aluminum plastic film and an electrode material are pyrolyzed in a branch way in a medium-temperature inert atmosphere, solid products of the aluminum plastic film and the electrode material and aluminum plastic film pyrolysis gas are sent into an inner layer of a double-layer high-temperature reaction furnace together for synergistic reduction, and then reduced solids are sent into an oxidizing atmosphere cooling area for controllable oxidation; meanwhile, harmful gas in each link is introduced into the outer layer of the double-layer furnace for high-temperature oxidation and then is purified. The system comprises two medium-temperature reaction furnaces and a double-layer high-temperature reaction furnace which are connected through pipelines to realize material cooperative treatment. According to the method, the components of the aluminum-plastic film serve as a reducing agent to achieve waste control with waste, precise control over the valence state of the metal is achieved through regional treatment, the lithium leaching efficiency reaches 99% or above, the nickel-cobalt-manganese leaching efficiency reaches 98% or above, the fluorine collection rate is increased to 87%, and the technical problems that a traditional recycling technology is low in metal recycling rate and serious in pollution are solved.

The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a preparation method of a silicon-carbon composite negative electrode material capable of simultaneously improving safety and rate capability, which comprises the following steps: adding resorcinol, cardiotonic phenol, a formaldehyde aqueous solution and isopropanol into a reaction container, adding a basic catalyst and a sulfonating agent, and reacting for 2-4 hours; reacting to obtain semi-solid resin; transferring the semi-solid resin to a curing reactor, curing, then crushing, sieving, dipping in a transition metal salt solution under ultrasonic conditions, drying, pre-oxidizing, pyrolyzing and carbonizing to obtain pyrolytic carbon; the pyrolytic carbon is activated and subjected to pore forming to obtain porous carbon, and the porous carbon is subjected to vapor phase silicon deposition and carbon coating to obtain the product silicon-carbon composite negative electrode material. According to the preparation method, the safety and the rate capability of the silicon-carbon composite negative electrode can be improved at the same time.

The invention relates to a pyrolysis process for dismantling photovoltaic modules, comprising different thermal phases and operating in a pyrolysis chamber having an internal atmosphere insulated from the outside. The thermal phases are as follows: - a pyrolysis phase, referred to as the first phase, during which polymers contained in the photovoltaic modules are decomposed into pyrolysis gases, said gases passing from the pyrolysis chamber to a post-combustion chamber for incineration; - an oxidation phase, referred to as the second phase, following the first phase, to oxidize carbonaceous residues generated during the pyrolysis phase. According to the process of the invention, a temperature sensor measures a temperature in the post-combustion chamber, referred to as the core temperature, and a carbon monoxide sensor measures the carbon monoxide concentration in the pyrolysis chamber.The second phase is not initiated until at least one of the following two conditions is met: - first condition: the difference between the core temperature and a setpoint temperature is less than a predefined threshold temperature difference, - second condition: the carbon monoxide concentration in the pyrolysis chamber is less than a predefined threshold concentration. Figure to be published with the abbreviation: -.