196 results about "Reduction treatment" patented technology

This invention belongs to the field of catalytic material preparation technology, specifically relating to a method for preparing high specific surface area pure phase α-type molybdenum carbide by hydrogen intercalation modification of MoO3 and its application, including the following steps: (1) adding MoO3 powder to hydrochloric acid and dispersing it to prepare a mixture of MoO3 and hydrochloric acid; (2) adding metal powder to the mixture in step (1) and performing pre-reduction treatment by in-situ hydrogenation of the metal and hydrochloric acid to prepare H x MoO3 precursor; (3) H prepared in step (2) x The MoO3 precursor is carbonized under a carbon source gas to obtain a pure α-type molybdenum carbide with a high specific surface area. This method is simple and effective, avoids the use of corrosive NH3 gas during carbonization, and does not require a metal as a medium, thus solving the current problem of not being able to prepare metal-free modified pure α-MoC in one step.

The invention discloses a high-strength and high-plasticity copper alloy and a preparation method thereof. The high-strength and high-plasticity copper alloy is prepared by mixing Cu-Al pre-alloyed spherical powder and CuO powder according to the mass ratio of (100-150): 1, wherein the Cu-Al pre-alloyed spherical powder and the CuO powder are different in particle size range. The solid solution state Al element part in the high-strength plastic copper alloy is oxidized into Al2O3 through CuO, and the Al2O3 exists in a Cu matrix. The preparation method comprises the following steps: (1) mixing Cu-Al pre-alloyed spherical powder with CuO powder, and drying; (2) cold isostatic pressing treatment; (3) vacuumizing, sintering at a high temperature in a protective atmosphere, and cooling; (4) vacuumizing, reducing in a reducing atmosphere, and cooling; and (5) after preheating, the copper alloy reduction blank is placed in a rotary forging die, rotary forging and air cooling are conducted, and the copper alloy is obtained. The high-strength plastic copper alloy is good in conductivity and mechanical property and high in plasticity. The method is simple in process, environmentally friendly, low in cost and suitable for industrial production.

The invention relates to the technical field of composite metal materials, in particular to a silver-coated graphene copper composite material and a preparation method thereof, and aims at solving the problems that traditional silver-coated copper powder is high in silver consumption, copper is oxidized due to the fact that a silver layer is prone to being damaged, and conductivity is insufficient. The method comprises the steps that a graphene coating layer is formed on a copper powder substrate in situ through chemical vapor deposition, and graphene copper powder is obtained; performing etching treatment on the graphene copper powder to controllably expose part of the copper substrate so as to form anchoring points for silver ion deposition; carrying out reduction treatment on the etched graphene copper powder so as to ensure that an anchoring site has chemical activity; in a reductive liquid phase environment, enabling a chemical silver plating solution to react with the graphene copper powder subjected to reduction treatment, and guiding silver ion deposition by utilizing an anchoring point, so as to form a silver coating layer on the surface of the graphene coating layer; and separating and drying the reacted system to obtain the silver-coated graphene copper composite material. The material is better in oxidation resistance and conductivity, and the process is free of waste liquid.

This method for treating a paper diaper involves: a step for crushing a used paper diaper and washing same; and a pulp content reduction treatment step for reducing the pulp content ratio of a pulp-containing plastic fraction produced in the previous step by fracturing treatment and sorting treatment. The sorting treatment is performed by wind power sorting treatment, sieving sorting treatment, wet specific gravity sorting treatment, or the like.

The embodiment of the invention belongs to the technical field of electrochemical gas sensors, and relates to a preparation method of a counter electrode of an NO sensor, which comprises the following steps: adding a polymer adhesive into an organic solvent to prepare a polymer adhesive mother solution; mixing manganese dioxide powder with the polymer adhesive mother liquor, and stirring to form uniform slurry; coating a substrate with the slurry, and performing drying treatment to form a counter electrode plate; and putting the counter electrode plate into an environment with reducing gas or inert gas to carry out high-temperature reduction treatment so as to improve the oxygen vacancy concentration, thereby obtaining the counter electrode of the NO sensor. The invention further provides an NO sensor and an NO detection method. The counter electrode of the NO sensor and the NO sensor prepared by the embodiment of the invention have the advantages of low cost and high anti-interference capability while keeping high oxygen reduction catalytic activity, and are particularly suitable for high-selectivity and high-sensitivity detection of NO gas in the fields of environmental monitoring, medical diagnosis and the like.

The invention relates to the technical field of spinal fracture treatment, in particular to a spinal fracture controllable expansion reset device which comprises a first insertion screw rod, a first locking bolt is arranged in the first insertion screw rod, and a middle connecting piece is arranged at the top of the first insertion screw rod. According to the spinal fracture controllable expanding and resetting device, by arranging the adjusting and locking assembly, a first insertion screw rod is screwed into the spine, then a second insertion screw rod can be pushed to rotate around a rotating shaft rod, and the angle of the second insertion screw rod needs to be adjusted according to a pointer and a scale ring plate when the second insertion screw rod is arranged at the initial position; the second insertion screw rod is inserted into the vertebral column, it is ensured that the second insertion screw rod is aligned with the bent vertebral column when placed into the vertebral column, after the second insertion screw rod is adjusted to the vertical direction, a locking screw rod and a nut need to be used for locking, and therefore the angle of the second insertion screw rod is locked, centrum reduction treatment is completed, spine fracture distraction reduction can be achieved in a posterior operation, the reduction effect is excellent, and practicability is high.

The invention discloses a pretreatment method for recycling phosphorus in sludge, which is characterized in that the sludge is subjected to reduction treatment by adopting aerobic biological decomposition drying, phosphorus is screened and fixed, and then phosphorus is recycled through pickling, the pretreatment method for recycling phosphorus in sludge is provided, the method is simple to operate, the cost is low, and the method is suitable for industrial production. The sludge is subjected to reduction treatment, resource recovery of phosphorus in the sludge is realized, and the problem of environmental pollution caused by loss of phosphorus in wastewater is prevented.

The utility model discloses underwater deposited sludge reduction treatment equipment which comprises an aeration device and a supporting device, the aeration device comprises a submersible pump, a micropore aeration head connected with a water outlet pipe of the submersible pump and an air inlet pipe communicated with the micropore aeration head, and the upper end of the air inlet pipe is located above the water surface; the supporting device comprises a bottom plate and a supporting frame located on the upper portion of the bottom plate, and an inner tetrahedral cone composed of four slopes is arranged in the middle of the supporting frame. The lower part of the submersible pump is provided with a movable support, the movable support comprises a mounting plate, and the lower part of the mounting plate is provided with an outer four-side cone consisting of four inclined planes; the outer tetrahedral cone of the movable support is installed in the inner tetrahedral cone of the supporting device in a matched mode. According to the utility model, the modes of mobile aeration and medicament feeding are adopted, so that bio-enzyme can be in direct contact with sludge deposited at the bottom of an activated riverbed, the effect of rapid decomposition can be achieved along with the great increase of dissolved oxygen in an aeration state, and the efficiency of sludge reduction treatment is improved.

The application relates to the technical field of MOF-based catalysts, in particular to a noble metal MOF-based catalyst, a preparation method and application. The catalyst is prepared by the method. The method comprises the following steps: preparing a noble metal-ligand chelation solution; adding manganese salt, a second organic ligand, a second organic solvent and water into the noble metal-ligand chelation solution in sequence, adjusting the pH value to 3-5 after stirring and dissolving, and obtaining a precursor suspension; cooling the precursor suspension to room temperature after a crystallization reaction; then, performing suction filtration, and performing first washing treatment on the obtained solid until the washing liquid is colorless and transparent; performing first vacuum drying treatment on the obtained solid, and obtaining a precursor powder; and performing reduction treatment, second washing treatment and second vacuum drying treatment on the precursor powder in sequence, and obtaining the catalyst. The application is the application of the catalyst in adsorptive catalytic oxidation of formaldehyde, and the conversion rate of formaldehyde can be greater than or equal to 95% at room temperature.

Provided is a method for producing a catalyst that makes it easier to produce a supported metal catalyst for ammonia synthesis, which has limitations in production methods or production facilities, particularly, has large limitations in industrial-scale production, and that can produce the catalyst with high activity. This method for producing a catalyst for ammonia synthesis is characterized by comprising a first step for preparing 12CaO. 7Al2O3 having a specific surface area of 5 m2 / g or more, a second step for supporting a ruthenium compound on the 12CaO. 7Al2O3, and a third step for reducing the ruthenium compound-supported 12CaO. 7Al2O3 obtained in the second step. The reduction treatment is performed until the average particle diameter of the ruthenium after the reduction treatment is increased by at least 15% relative to the average particle diameter of the ruthenium before the reduction treatment.

The invention relates to the technical field of solid waste treatment, and discloses a sludge harmless and reduction treatment process which comprises a central control system, and a hydrolysis unit, an anaerobic reaction unit, a digestive juice temporary storage unit, a centrifugal dewatering unit, a sunlight drying unit and a sludge temporary storage and packaging unit which are sequentially connected in series. Marsh gas generated by the anaerobic reaction unit is purified and then enters the marsh gas utilization unit, and a heat energy recovery device configured in the marsh gas utilization unit conveys waste heat to the hydrolysis unit, the anaerobic reaction unit and the sunshine drying unit through a heat medium water circulation pipe network to form a heat circulation loop. The central control system is used for blending feeding based on a dry matter mass balance principle, controlling anaerobic temperature by utilizing cascade feedforward logic, and adjusting drying ventilation according to an indoor and outdoor absolute moisture content difference value. The energy self-sufficiency rate and the operation stability of sludge treatment are improved by constructing a closed-loop system for material conveying and energy recovery and combining a multi-parameter coupling control strategy.

The invention discloses an electroplating sludge reduction treatment device. The treatment device comprises an outer box body, a drying mechanism and a synergistic mechanism, the drying mechanism comprises a conveying part and a drying part, the conveying part is arranged in the outer box body, and the air exhaust position of the drying part is located under the conveying part; the efficiency increasing mechanism comprises a lifting assembly and a knocking assembly; wherein the lifting assembly is arranged on the inner side of the conveying part, and the lifting assembly swings under the rotation of the conveying part; the knocking assembly is located above the portion, conveying the mud strips, of the conveying part, the knocking assembly does vertical lifting reciprocating motion under swinging of the lifting assembly, and the knocking assembly is provided with at least two alternate knocking point positions. In the invention, the lifting assembly is designed, and the lifting assembly can enable the conveying mesh belt to generate periodic horizontal micro-amplitude vibration, so that not only can wet sludge be effectively prevented from being adhered to the mesh belt, but also upper-layer sludge strips can tend to be loosely arranged and be lifted by vibration.

The invention relates to the technical field of industrial solid waste resource utilization and chemical product preparation, and particularly discloses a preparation process for producing ferrous sulfate by utilizing tailings. According to the process, iron-rich tailings (such as pyrite acid-making cinder and titanium dioxide production byproduct ferrous sulfate) are used as main raw materials, and the high-purity ferrous sulfate heptahydrate (FeSO3.7H2O) product is prepared through the steps of crushing and grinding, acid leaching reaction, reduction treatment, purification and impurity removal, cooling crystallization, centrifugal separation, drying and the like. The method is characterized in that the sulfuric acid concentration, the reaction temperature and the liquid-solid ratio in the acid leaching stage are optimized, a specific reducing agent (such as iron powder or pyrite) is introduced, it is ensured that iron elements are efficiently dissolved out in a divalent form, and meanwhile harmful impurities such as heavy metal and arsenic are effectively removed through a step-by-step purification method. According to the method, high-added-value resource utilization of the industrial solid waste is achieved, the technological process is simple, the cost is low, the product purity is high, the problem of environmental pollution caused by tailing stockpiling is solved, and remarkable economic benefits and environmental benefits are achieved.

The application provides a recovery method and a recovery device, the recovery method comprising the following steps: performing chlorine ion electrolytic oxidation treatment on a phosphorus-iron system to obtain a dechlorinated phosphorus-iron residue system; performing trivalent iron electrolytic reduction treatment on the dechlorinated phosphorus-iron residue system to obtain a reduction system; performing impurity removal treatment on the reduction system to obtain a divalent iron system; and performing divalent iron electrolytic oxidation treatment on the divalent iron system to obtain a trivalent iron system. The recovery method provided by the application takes the phosphorus-iron system as a recovery object, realizes the separation of trivalent iron and impurity elements to the greatest extent, has low recovery cost, and is helpful to the popularization and application in the industrial field.

The application provides a method and device for removing impurities, and the method comprises the following steps: performing trivalent iron-electrolytic reduction treatment on a delithiated phosphorus-iron slag system to obtain a reduction system; and performing impurity removal treatment on the reduction system to obtain a divalent iron system. The method for removing impurities can efficiently remove and recover iron elements in delithiated oxidation products of lithium iron phosphate at a lower cost.

The invention provides a mine sludge curing agent and a preparation and in-situ treatment method thereof, and relates to the cross technical field of solid waste recycling and mine filling materials. The curing agent is prepared from a solid-phase component and water, and the solid-phase component comprises the following components in parts by mass: 30-60 parts of mine sludge, 8-42 parts of cement and 16-56 parts of mineral powder; the mass ratio of the water to the solid-phase component is 60: 100 by taking the total mass of the solid-phase component as 100 parts. Mine sludge is used as a core solidification object, and the slag is combined to realize solid waste collaborative absorption. The prepared material has good fluidity, early strength and structural stability, not only meets the construction and strength requirements of mine grouting, but also realizes efficient solidification and recycling of sludge, greatly reduces the material and solid waste treatment cost, and explores a way for recycling and reduction treatment of mine solid waste and low cost of mine engineering materials.

The invention discloses a heavy metal emission reduction and sludge reduction treatment process method for circuit board wastewater. The invention provides a layered precipitation strategy of'first acid, second alkali and second sulfur '. The method comprises the following steps: performing acid precipitation on alkaline organic wastewater by using acidic wastewater, and recovering printing ink residues; carrying out air stripping treatment on the copper ammonia wastewater by utilizing an alkaline condition, and precipitating high-purity copper hydroxide; and finally, carrying out deep precipitation on residual complexing heavy metals by utilizing excessive sulfides in the pretreatment stage, and further recovering copper resources in the comprehensive water tank through coprecipitation of copper hydroxide and copper sulfide. Sludge generated in each process is classified and treated; printing ink slag, biochemical residual sludge and copper / nickel sulfide sludge are subjected to synergistic pyrogenic process treatment; copper hydroxide sludge is selectively subjected to acid dissolution to prepare copper sulfate. Lime, ferrous sulfate and polyaluminum are not used in the whole process. According to the method, the medicament is utilized to the maximum extent, the sludge is reduced by 50% or above, and the resource value of valuable metal is increased by 3-5 times.

The application belongs to the technical field of wave-absorbing materials, and particularly relates to a simple method for in-situ synthesis of FeSi@SiC high-temperature-resistant wave-absorbing material. The method comprises the following steps: dissolving Fe(NO3)3.9H2O in anhydrous ethanol, adding SiC powder, stirring, evaporating anhydrous ethanol in the solution, and heating to remove the combined water in the solid; grinding the solid after the combined water is removed into a powder sample, adding Fe powder and KCl, mixing uniformly, and performing reduction treatment; grinding the reduced solid powder thoroughly, adding hydrochloric acid solution, filtering, washing, and drying to obtain FeSi@SiC. The FeSi@SiC material is in-situ synthesized by the impregnation reduction method in one step, the preparation method is simple, the obtained FeSi@SiC material has high-temperature resistance and wave-absorbing performance, the physical properties do not change under the condition of 1300 DEG C, the material still has magnetism at 673K and excellent wave-absorbing performance, and has considerable industrial application value.

This invention provides a method for removing phosphorus from iron ore. [Solution] By supplying a reducing gas to a heating furnace into which iron ore containing phosphorus has been introduced, phosphorus is removed from the iron ore. The temperature of the reducing gas is set to 600°C or higher and less than 750°C. Furthermore, the composition of the reducing gas and the processing time of the reduction treatment are set so that the reduction rate of iron in the iron ore is 7.4% or higher and 56.1% or lower, and the metallization rate of iron in the iron ore is 0.4% or higher and 41.2% or lower. Here, the composition of the reducing gas can be fixed and the processing time can be set, or the processing time can be fixed and the composition of the reducing gas can be set.

Provided is a method for treating nickel oxide ore that enables efficient recovery of nickel as a recovery target. A method for producing a sulfide, which is a method for producing a sulfide from nickel oxide ore, includes: a mixing process in which nickel oxide ore and a reducing agent are mixed to obtain a mixture; a reduction process in which the mixture is charged into a reduction furnace and subjected to reduction treatment to obtain a reduction product including a metal that is a ferro-nickel and a slag that is an oxide; a separation process in which the metal and the slag are separated from the reduction product; and a sulfidation process in which a sulfidation agent is added to the metal obtained in the separation process to obtain a sulfide containing nickel.

The invention discloses a supported Ni-based alloy catalyst preparation method, which comprises: S1, dissolving a tungsten compound in water, loading on an Al2O3 carrier through an impregnation method, aging, drying, and roasting in air to obtain an intermediate; and S2, dissolving a nickel compound in water, loading the nickel compound on the intermediate through an impregnation method, aging, drying, roasting in air, and performing reduction treatment in an H2 atmosphere to obtain the catalyst. The catalyst is high in activity, good in selectivity and stability, simple in preparation method and low in cost.

The invention discloses an efficient preparation method of perdeuterated 3-methyl-3-butene-1-alcohol. The efficient preparation method comprises the following steps: S1, preparing deuterated 3-methyl-2-ethyl crotonate; s2, carrying out isomerization treatment on the deuterated 3-methyl-2-ethyl crotonate, and introducing a deuterium atom by taking deuterium water as a deuterium source, so as to obtain the deuterated 3-methyl-3-ethyl crotonate; and S3, under the water-free and oxygen-free conditions, carrying out reduction treatment on the deuterated 3-methyl-3-ethyl crotonate by adopting a deuterated reducing agent, so as to obtain the perdeuterated 3-methyl-3-butene-1-ol. According to the method, the perdeuterated 3-methyl-3-butene-1-ol can be prepared easily, mildly and efficiently, and technical support is provided for isotope labeling research of a terpenoid biosynthesis mechanism.

The invention relates to the technical field of metallurgy, in particular to a preparation method of a high-nitrogen vanadium-nitrogen alloy and the high-nitrogen vanadium-nitrogen alloy.The preparation method comprises the following steps that 1, wet-based industrial-grade ammonium vanadate, a graphite carbon powder reducing agent, a metal iron powder catalyst and a water-based binder are mixed and stirred according to the mass ratio of 100: (18-22): (0.2-0.5): (8-20), and a mixture is obtained; 2, the mixed material is subjected to compression molding, and a preformed material is obtained; and 3, the preformed material is sequentially subjected to low-temperature pre-sintering dehydration treatment, high-temperature nitridation reduction treatment and cooling annealing treatment, and the high-nitrogen vanadium-nitrogen alloy is obtained. According to the preparation method, industrial-grade wet-based ammonium vanadate is directly adopted as a raw material, pretreatment is not needed, and the production cost is further reduced.

The embodiment of the invention relates to a semiconductor structure and a preparation method thereof. The preparation method comprises the following steps: providing a substrate, and forming an initial gate structure on the substrate; the initial gate structure comprises a gate and an initial side wall; forming a metal silicide layer on the surface, exposed in the interval between the adjacent initial gate structures, of the substrate; performing at least one etching cleaning process on the initial side wall to obtain a side wall with the thickness meeting a target value; the etching and cleaning process comprises the following steps: transversely etching an initial side wall along a direction parallel to the substrate; cleaning a structure obtained after transverse etching of the initial side wall by using a cleaning solution; performing reduction treatment on the cleaned structure to form a protective layer on the surface of the metal silicide layer; wherein if the thickness of the side wall obtained after transverse etching of the initial side wall is larger than a target value, the next etching cleaning process is executed; and if the thickness of the side wall obtained after transverse etching of the initial side wall meets a target value, removing the protection layer. And the electrical property of the semiconductor structure is improved.

The invention relates to a Ga-ZSM-5 catalyst, a preparation method thereof and an n-butane catalytic cracking method. The preparation method comprises the following steps: mixing an H-type ZSM-5 molecular sieve with gallium oxide, carrying out reduction treatment in a reducing atmosphere, and carrying out oxidation treatment to obtain the Ga-ZSM-5 catalyst. The method comprises the following steps: mixing a metal source with an H-type ZSM-5 molecular sieve, and carrying out atmosphere treatment to obtain the Ga-ZSM-5 bifunctional catalyst. Compared with a traditional impregnation method for introducing metal, the method disclosed by the invention is simpler and more convenient in operation steps, and the catalyst obtained by the method disclosed by the invention can achieve catalytic activity equivalent to that of the catalyst obtained by the impregnation method. Compared with unmodified H-type ZSM-5, the Ga-ZSM-5 catalyst disclosed by the invention is used for the catalytic cracking reaction of n-butane, and can effectively improve the conversion rate of n-butane and improve the yield of low-carbon olefin and light aromatic hydrocarbon.

The invention relates to a CO adsorbent and a preparation method and application thereof, the method comprises the following steps: S1, contacting a porous carbon carrier, a first copper source, a second copper source and water to obtain a contacted carrier; s2, performing primary reduction treatment on the contacted carrier in a first inert atmosphere to obtain an adsorbent intermediate; s3, under the pressurization condition, performing secondary reduction treatment on the adsorbent intermediate in a second inert atmosphere; the first copper source comprises CuCl2; the second copper source comprises Cu (CH3COO) 2; in the step S1, in terms of copper element, the molar ratio of the first copper source to the second copper source is (0.9-1.0): (1.0-1.1); the temperature rise rate of the first reduction treatment is 5 DEG C / min or less. The method disclosed by the invention is simple in steps, industrial-grade production can be realized, Cl2 gas is not generated, and the prepared CO adsorbent is relatively high in monovalent copper content and has good adsorption performance.

According to the sludge reduction treatment process, a sedimentation tank is communicated with an adjusting tank, and the adjusting tank is communicated with an anaerobic tank, an anoxic tank and an aerobic tank and then communicated with a secondary sedimentation tank and a disinfection tank; the device is characterized in that the secondary sedimentation tank is communicated with the sludge concentration tank; one path of the sludge concentration tank is communicated with the filter-pressing dehydration device; the filter-pressing dehydration device is communicated with the regulating tank and the discharge port; supernate of the sludge thickening tank flows into the regulating tank; filtered water of the filter-pressing dehydration device flows into the adjusting tank; the sludge concentration tank is provided with a micro-nano aeration device, a microbial active enzyme MP16 is put into the sludge concentration tank, the MP16 enzyme and the efficient micro-nano aeration device are put into the sludge concentration tank to carry out biochemical reaction and accelerate the reaction rate, and 80%-90% of organic sludge can be degraded only in 4-6 hours; upper-layer treated clear water flows back into the adjusting tank to be continuously subjected to water treatment (can be used as a carbon source to be supplemented into the adjusting tank), and other inorganic sludge is conveyed to be subjected to filter pressing dehydration and then can be transported outwards for disposal.

Provided is a method for producing a catalyst capable of producing vinyl acetate at a particularly high selectivity while ensuring high catalytic activity. One method is a method for producing a catalyst for producing vinyl acetate, which comprises a carrier, copper, palladium, gold, and an acetate salt, and the method comprises the following steps in order: Step 1, a step of impregnating the carrier with an alkali solution; Step 2, a step of bringing the carrier into contact with a solution containing a compound containing copper, a compound containing palladium, and a compound containing gold; Step 3, a step of performing a reduction treatment; and Step 4, a step of supporting the carrier with an acetate salt.