22 results about "Oxidation process" patented technology

The application discloses a method for repairing chlorinated groundwater pollution based on carbon dioxide nanobubbles, and the method is characterized in that nZVI, H2O2 and EDDS reagents are injected in a time sequence at different stages, and CO2 nanobubbles are used as a multifunctional medium throughout the process. The CO2 nanobubbles not only continuously remove the passivation layer through in-situ acidification, thereby fundamentally promoting the reduction effect of nZVI on chlorinated organic matter, but also couple a subsequent Fenton oxidation process, thereby greatly promoting the complete oxidation effect of toxic intermediates, effectively inhibiting the conversion of the final reaction product Fe 2+ Into secondary minerals, and controlling the risk of blockage from the source. Through the design of in-situ generation of catalyst Fe 2+ And the final removal of iron ions, the application maximizes the dosage of exogenous chemicals and the final residual, overcomes the environmental risks that may be introduced by traditional technologies or cause permanent physical damage, and realizes efficient, complete and sustainable repair of chlorinated organic pollutants in groundwater. 3+ ​

The application provides a method for efficiently recycling valuable elements by synergistically smelting neodymium iron boron waste and electronic waste, which comprises the following steps: preparing a mixture of powdered neodymium iron boron waste, fine-grained electronic waste, a slagging agent and a solid reducing agent; and using a top-blown smelting furnace to oxidize and reduce the mixture; by controlling the conditions of the oxidation process, the iron and rare earth in the mixture are oxidized into oxides and enter the slag, copper is not oxidized and captures rare and precious metals such as gold and silver to form crude copper and sink to the bottom of the furnace and is discharged; by controlling the conditions of the reduction process, the iron oxide in the mixed rare earth slag is reduced to metallic iron, and the rare earth oxide is not reduced and remains in the slag layer; the iron with a larger density than the rare earth slag sinks to the bottom of the furnace, and after static stratification, the iron and the rare earth slag are discharged from the metal outlet and the slag outlet respectively, so that the separation of the rare earth and the iron is realized; and finally, the synchronous recovery of the rare earth, the iron in the neodymium iron boron waste and the copper, gold and silver in the electronic waste is realized; the method has a short process flow, low energy consumption and good economic and environmental benefits.

This invention discloses a method for oxidative leaching of selenium and mercury from copper smelting acid sludge, belonging to the field of solid waste comprehensive utilization technology. The leaching system in the oxidative leaching is a ternary synergistic oxidative leaching system of "sulfuric acid-sodium chloride-oxidant". Under the action of the synergistic leaching system, efficient and selective leaching of selenium and mercury from copper smelting acid sludge is achieved. This method avoids the corrosion of equipment by volatile acids and the problem of excessive oxidation of the nitric acid system, and significantly improves the stability of the oxidation process and the efficiency of reagent utilization, ultimately achieving multiple goals such as efficient recovery of valuable metals, low-carbon and energy-saving process flow, and compliant and harmless treatment of hazardous waste.

The application discloses a method for reducing lime consumption in smelting stainless steel from ferro-nickel water, and belongs to the technical field of stainless steel smelting. The method mainly comprises nine steps of iron adding, desiliconizing period, main decarburization period, secondary decarburization period, side gun decarburization first stage, side gun decarburization second stage, side gun decarburization third stage, reduction stage and adjustment stage. The method can significantly reduce lime consumption, indirectly reduce ferrosilicon and fluorite consumption, and reduce production cost by stabilizing the alkalinity and silicon content in the desiliconizing period, improving the carbon content at the end of the main decarburization period and the secondary decarburization period, and reducing the oxygen supply intensity in the secondary decarburization period and the oxidation of Cr elements in the oxidation process.

The invention discloses a method for measuring low-temperature oxidation reaction rate of crude oil by using pressure changes under different atmosphere conditions, and belongs to the technical field of oil reservoir development. According to the technical scheme, a pressure-bearing container is adopted, and an air and high-purity nitrogen parallel contrast experiment is designed, so that the oxidation process of crude oil at low temperature is accurately quantified; the interference of nitrogen on oxygen consumption evaluation is effectively eliminated by accurately monitoring and comparing the change of pressure in the two containers along with time, so that the oxidation reaction of oxygen and crude oil is accurately reflected; and calculating the oxidation reaction rate in combination with a gas state equation. The method has the beneficial effects that the data accuracy can be remarkably improved, the oxidation characteristics of the crude oil can be quickly evaluated, and the production process and safety management are optimized; meanwhile, understanding of an oxidation mechanism is deepened, and development of a kinetic model is promoted. The method is widely applicable to evaluation of oxidation stability of chemicals in the fields of energy, chemical industry and the like, and industrial green transformation and technical innovation are promoted.

A method for extracting copper from sulphide mineral ore, comprising the following steps: stacking the ore to form a pile (heap), a leaching step, irrigating the pile with a first irrigating solution containing an acidic nitrate solution and nitrite, thereby causing the oxidation of sulfide minerals inside the pile, oxidation of gaseous nitrogen oxide released during the oxidation of sulfide minerals inside the pile with oxygen to form nitrogen dioxide, and hydrolysis of nitrogen dioxide to form nitric acid and / or nitrous acid in the first irrigating solution inside the pile, to continue the leaching stage and reduce nitrogen oxide losses from the pile.

The present application belongs to the field of preparation of cracking furnace tube, and particularly relates to an anti-coking furnace tube with an oxidation layer with good high-temperature stability and a preparation method thereof. The present application generates a complete and dense, single and uniformly distributed Al2O3 oxidation layer on the surface of the furnace tube by optimizing the alloy composition and adopting a two-step low-temperature and high-temperature pre-oxidation process, i.e. after low-temperature heat treatment of the furnace tube in a low-oxygen partial pressure atmosphere, the furnace tube is heated to high temperature at a constant heating rate for heat treatment, and the oxidation layer can exhibit excellent high-temperature stability and adhesion during high-temperature cyclic oxidation at 1000 DEG C for 460 h.

The present application relates to a kind of phosphogypsum method and system of sulfuric acid.The method includes the following steps: (a) phosphogypsum and reducing agent are mixed granulation, and raw material particle is obtained;(b) raw material particle is treated by reduction, and after reduction material is obtained, after reduction material is treated by oxidation, and calcium oxide and flue gas are obtained;(c) flue gas is carried out gas-solid separation, after heat exchange of gas phase and oxygen-containing gas, preheated oxygen-containing gas and heat exchanged flue gas are obtained;(d) after heat exchanged flue gas is treated by impurity removal, sulfur dioxide in converted impurity-removed flue gas is converted into sulfur trioxide, and converted flue gas is obtained;(e) converted flue gas is absorbed by sulfuric acid with mass fraction of more than 98%, and sulfuric acid product and absorption tail gas are obtained;Wherein, preheated oxygen-containing gas is divided into two, and is respectively introduced into reduction process and oxidation process.The method of the present application can greatly reduce production cost, improve calcium sulfate decomposition rate, improve flue gas sulfur dioxide concentration and product quality.

The application discloses a COD degradation treatment method and system for industrial wastewater, and relates to the field of wastewater treatment, which comprises the following steps: introducing the industrial wastewater into a micro-electrolysis unit, monitoring water quality parameters in real time, dynamically setting the pH value of the micro-electrolysis unit according to the water quality parameters and a preset optimization algorithm model, and obtaining pretreated effluent; introducing the pretreated effluent into a heterogeneous Fenton treatment unit, adding hydrogen peroxide and a heterogeneous Fenton catalyst composed of iron and carbon to the pretreated effluent, dynamically controlling the oxidation process based on real-time monitoring data, and obtaining oxidized effluent; adding reagents to the oxidized effluent, intelligently controlling the flocculation and sludge discharge process based on real-time monitoring data, realizing solid-liquid separation, and obtaining purified effluent. By combining micro-electrolysis treatment with heterogeneous Fenton treatment, the working efficiency and quality of the degradation treatment of industrial wastewater are improved, and a large amount of hazardous waste iron sludge is reduced, thereby reducing the secondary pollution risk of industrial wastewater treatment.

This invention discloses a modular, controllable atmosphere high-temperature oxidation device for the recovery of substandard sponge zirconium, relating to the fields of nuclear fuel cycle and materials technology. The device includes: a furnace body system, comprising, from the outside to the inside, a steel outer shell, a refractory insulation layer, and a detachable furnace liner; multiple independently controlled heating zones arranged along the furnace body axis, each equipped with an independent heating element and thermocouple; an atmosphere control system including nitrogen and oxygen sources, an inert gas source, a mass flow controller, and a mixer; a sealing and cooling system employing a high-temperature sealing ring and a double-layer furnace shell design, with circulating cooling water flowing through the interlayer; and an automatic control system equipped with a temperature-atmosphere-time automated control program for fully automated operation and remote monitoring of the oxidation process. The device provided by this invention can achieve efficient and uniform oxidation treatment of irregular porous sponge zirconium within the range of 500-1000℃, transforming it into zirconium oxide with consistent physical properties.

The invention discloses a coal flame retardant based on calcium salt substances, which consists of the following components in percentage by weight: 50-90% of a main flame retardant which is one or more calcium salt substances; 5%-30% of a catalytic synergist which is a metal oxide or hydroxide; the surfactant is used for improving the wettability and adhesiveness of the flame retardant on the surface of coal; and the balance of a filler. According to the coal flame retardant based on the calcium salt substances, the characteristic that calcium salt (such as calcium carbonate and calcium hydroxide) is decomposed and releases carbon dioxide and water when heated is utilized, the oxygen concentration on the surface of coal can be effectively reduced, a large amount of heat is absorbed, and therefore the oxidation process of coal is efficiently inhibited from the two aspects of the gaseous state and the heat source.

The invention provides a deep trench isolation structure and a manufacturing method thereof, and the method comprises the steps: providing a substrate, and forming a deep trench in the substrate; a first oxidation process and a second oxidation process are sequentially executed, a first oxidation layer and a second oxidation layer are sequentially formed on the side wall and the bottom of the deep trench, the first oxidation process is oxidation in the atmosphere of chlorine-containing gas, and the second oxidation process is wet oxidation; executing a high-density plasma chemical vapor deposition process, and forming a third oxide layer on the side wall and the bottom of the deep trench; and filling polycrystalline silicon in the deep trench. According to the invention, through the combination of the two oxidation processes and the chemical vapor deposition process, under the condition of not changing the film thickness of the traditional oxidation layer, an outward concave sharp corner which is easy to appear after the oxidation layer is grown at the bottom of the deep trench in the traditional process can be eliminated, so that filling material cracks caused by stress accumulation during filling of polycrystalline silicon are reduced, and the quality of the polycrystalline silicon is improved. And meanwhile, the process compatibility is improved, and the performance and the reliability of the device are improved.

The invention belongs to the technical field of metal surface treatment, discloses a preparation process of a steel plate with black appearance and a product, and aims to realize accurate control of the black appearance, according to the method, a black oxidation film with an anoxic structure is generated in situ by introducing a multi-phase coating with obvious oxidation activity difference and utilizing the ordered oxidation process of each phase. Specifically, the surface of the steel plate is plated with a zinc-aluminum-magnesium plating layer, and two-stage water vapor oxidation treatment is conducted, specifically, in the first stage, an Al-rich phase is preferentially oxidized to form a base film, and in the second stage, an MgZn2 phase is oxidized to form a black oxidation film. The brightness value of the obtained steel plate is less than or equal to 35, the thermal radiation heat dissipation performance is excellent, the film layer is crack-free, and the steel plate is suitable for long-term use. By limiting the reaction endpoint at the MgZn2 phase oxidation completion stage, the defects caused by Zn-rich phase oxidation are avoided, the problems that a traditional method is difficult in appearance control and poor in environmental protection property are solved, and the method is suitable for the field of high-end equipment shells.

The invention relates to the technical field of non-ferrous metal metallurgy, in particular to a comprehensive recovery method for low-grade lead-zinc oxidized ore resources. According to the method, through a side-blown smelting furnace oxidation process and a fuming furnace reduction process, firstly, pyrometallurgy oxygen-enriched smelting is carried out, high-lead smoke dust and zinc-germanium-containing slag are produced, zinc oxide smoke dust is obtained through fuming reduction volatilization, then the zinc oxide smoke dust enters a zinc hydrometallurgy process, the high-lead smoke dust enters a pyrometallurgy lead smelting process for batching, and the zinc-germanium-containing slag is obtained. And finally, lead metal (rich in silver), zinc metal, germanium concentrate and tailings are generated. The method aims at achieving comprehensive recovery of low-grade lead-zinc oxidized ore resources by improving the recovery rate of lead and zinc in the low-grade lead-zinc oxidized ore and conducting cooperative treatment on silver, germanium and cadmium at the same time, and a new thought is provided for comprehensive recovery and large-scale industrial production of the low-grade lead-zinc oxidized ore resources.

The application provides a Rhodopseudomonas palustris SX2 and an application thereof, an iron oxidation method, a composition and a culture, and belongs to the technical field of environmental microorganisms. The strain is preserved in the China General Microbiological Culture Collection Center, and the preservation number is CGMCC No. 38191. The strain can efficiently oxidize free state and organic combined state Fe(II) under anaerobic light conditions, especially has stronger oxidation capacity for the organic combined state Fe(II), and the oxidation process is coupled with cell growth and inorganic carbon fixation; the photo-iron oxidation product is goethite short-range ordered nanocrystalline state iron mineral, and the iron minerals formed under different iron forms are different in spatial distribution and particle size. The Rhodopseudomonas palustris SX2 provided by the application provides a microbial material with excellent performance for environmental remediation, iron resource, sewage treatment and divalent iron pollution treatment.

The invention discloses a device for in-situ determination of the iron ammonia oxidation rate of tidal estuary sediments and overlying water, which comprises a bottomless hollow experiment bin, the lower part of the experiment bin is arranged in the sediments, the upper part of the experiment bin is immersed in the overlying water, the top of the experiment bin is provided with an exhaust port sealed by a sliding cover, the outside of the experiment bin is provided with a liquid injection device, and an injection port is arranged in the experiment bin; a helium channel is arranged outside the experimental chamber, an outlet of the channel is arranged at the interface of sediment and overlying water in the experimental chamber, the upper part of the channel is provided with an overlying water sampling port and an overlying water sampler connected outside the channel, and the lower part of the channel is provided with a pore water sampling port and is connected with the pore water sampler through a hose; and a plurality of probes in communication connection with the signal receiver are also arranged in the upper part. The method is high in applicability and simple to operate, can realize in-situ synchronous determination of the iron ammonia oxidation rate of the tidal estuary sediments and the overlying water, and has a relatively high practical value and a wide popularization prospect for deeply understanding and mastering the iron ammonia oxidation process of the tidal estuary with relatively rich nitrogen and iron.

The application discloses a device for in-situ determination of iron ammonia oxidation rate of tidal estuary sediment and overlying water, comprising: a bottomless hollow experimental bin, the lower part of which is arranged in the sediment, the upper part of which is immersed in the overlying water, the top of which is provided with an exhaust port closed by a sliding cover, the outside of which is provided with a liquid injection device, the injection port being in the experimental bin, the outside of which is further provided with a helium gas channel, the outlet of the channel being arranged at the interface between the sediment and the overlying water in the experimental bin, the upper part of which is provided with an overlying water sampling port connected with an overlying water sampler outside, the lower part of which is provided with a pore water sampling port connected with a pore water sampler through a hose, and the upper part of which is further provided with a plurality of probes in communication connection with a signal receiver. The application has strong applicability, simple operation, can realize in-situ synchronous determination of iron ammonia oxidation rate of tidal estuary sediment and overlying water, and has high practical value and broad popularization prospect for deep understanding and mastering of the iron ammonia oxidation process of the tidal estuary rich in nitrogen and iron.

The application provides a surface alkaline oxidation treatment method of an alloy steel material, which comprises the following steps: removing the carbon layer on the surface of the alloy steel material by machining, removing the oil stains and impurities on the surface of the alloy steel material, immersing and etching the alloy steel material in an acid activation treatment solution, removing the rust on the surface of the alloy steel material, dissolving the original oxidation film on the surface of the alloy steel material, exposing the surface of the alloy steel material, performing three times of alkaline oxidation treatment on the activated alloy steel material, oxidizing the surface of the alloy steel material to form a film, performing hot water cleaning on the alloy steel material after the alkaline oxidation film formation, and controlling the drying or saponifying and then blowing dry of the alloy steel material after oil immersion. The application can improve the film formation quality and corrosion resistance, solve the red hanging ash problem and the poor adhesion problem of the metal oxidation at room temperature in the traditional metal alkaline oxidation process, improve the oxidation film formation quality and corrosion resistance, has high process operability, low cost and is easy to realize continuous production.

The invention belongs to the field of oil-gas field development. The invention discloses a method for judging the position of a thermal oxidation front in an air injection process. The method comprises the following steps: filling sand grains into a model pipe based on the target permeability of an oil field reservoir to be simulated; performing vacuumizing operation on the model pipe; the injection end of the model pipe is connected to prepared formation water, and the formation water is introduced into the model pipe; using the target crude oil to displace saturated formation water in the model pipe until no water is produced; heating the model pipe to the temperature of the stratum to be simulated; after the starting temperature is reached, air is injected into the model pipe at the set ventilation intensity, the temperature of the set position of the model pipe is measured, a temperature curve is drawn according to the temperature data of the temperature measurement positions, and the position of the on-way oxidation front in the oxidation process is monitored based on the temperature curve.

The invention relates to the technical field of silver-coated copper powder, in particular to a preparation and surface modification method of oversized silver-coated copper powder. Comprising the steps of pretreatment, electroplating, cleaning and surface modification treatment, a surface modifier is used for optimizing the structure of a silver plating layer, the silver plating layer is more compact, a protection layer can be formed on the surface of silver-coated copper powder, corrosive substances in the environment are further isolated, and therefore contact between a copper core and oxygen and water is effectively isolated, the oxidation process is delayed, and the corrosion resistance of the copper core is improved. And the compatibility of the silver-coated copper powder and organic slurry can be greatly improved, and the application effect of the silver-coated copper powder in aqueous slurry is improved.

This invention relates to the fields of ultrapure stainless steel smelting, nitrogen removal from molten steel, and steelmaking heat balance. A method for smelting ultrapure 409 series steel using AOD (Alkali Oxide) includes the following steps: Step 1: After the blast furnace hot iron undergoes three decarburization treatments to achieve P≤0.025%, AOD is added for carbon removal; Step 2: In the initial stage of decarburization, inert gas is blown from the side of the AOD to remove dissolved nitrogen from the molten steel using CO generated from the carbon-oxygen reaction; Step 3: When the carbon content in the molten pool decreases to 0.3-0.4%, the molten pool temperature is corrected by measuring the temperature of the molten steel in the furnace using a secondary lance, and the total amount of ferrosilicon to be added is calculated based on the measured temperature and the total oxygen blowing volume; Step 4: During the decarburization period, the slag basicity is controlled at 1.8-2.0, and the amount of lime added = total metal content * silicon content * 2.14 * 2.0 / 0.85. No more lime is added after the temperature rises following the addition of ferrosilicon; Step 5: After sampling to confirm the composition of the molten steel, the temperature and composition of the molten steel are adjusted. At the end of the oxidation process, the temperature of the molten pool is rapidly increased to 1700-1720℃ by adding ferrosilicon, so as to achieve preferential oxidation of carbon and chromium, thus achieving decarburization and chromium preservation and improving chromium yield.

The invention belongs to the technical field of metallurgy, and provides a method for preparing ferric oxide powder based on atomized oxidation of molten pure iron, pure molten iron raw materials are selected, impurities are prevented from being brought into the raw materials, the product purity is effectively guaranteed, compared with wet-process FeCl3 and FeSO4 raw materials, subsequent precipitation and washing procedures are not needed, the production process is shortened, industrial wastewater is avoided, and the method is suitable for industrial production. The green industrial production requirements are met. Dry pure oxygen is used as a unique atomization and oxidation medium, atomization crushing of pure molten iron is achieved, synchronous oxidation is completed, the process link is simplified, compared with a dry oxidation roasting and secondary grinding process, an additional grinding process is not needed, production energy consumption is reduced, and meanwhile impurities introduced by equipment abrasion in the grinding process are avoided. The secondary oxidation procedure ensures sufficient oxidation, the problem of insufficient product purity caused by incomplete oxidation in the prior art is solved, and finally the purity of the ferric oxide product can break through the prior art; the use requirements in the high-purity field are met.