58results about "Ammonium nitrates" patented technology

The application provides a cementing material based on electrolytic manganese residue and a preparation method, wherein the preparation method comprises the following steps: heating and treating original electrolytic manganese residue in a first preset temperature range to obtain a first electrolytic manganese residue material; heating and treating the first electrolytic manganese residue material in a second preset temperature range to perform desulfurization and ammonia fixation on the first electrolytic manganese residue material, and obtain a second electrolytic manganese residue material; heating and treating the second electrolytic manganese residue material in a third preset temperature range to solidify heavy metal ions in the second electrolytic manganese residue material, and obtain a target mineral phase with stable structure; the first preset temperature range < the second preset temperature range < the third preset temperature range; and cooling the target mineral phase to room temperature and grinding to obtain the cementing material. According to the scheme, the electrolytic manganese residue is harmlessly treated through multi-stage heating; and the cementing material is prepared according to the product after the heating treatment, so that the electrolytic manganese residue is maximally utilized.

The present application relates to the technical field of ammonium nitrate production equipment, and provides a neutralization reaction device for ammonium nitrate solution, which comprises a reactor, a dilute nitric acid conveying unit, an ammonia gas evaporation unit, a liquid-phase pH detection device and a controller; the dilute nitric acid conveying unit is in communication with a dilute nitric acid control valve; the ammonia gas evaporation unit is in communication with an ammonia gas control valve; the liquid-phase pH detection device is in communication with a liquid-phase pH detection sampling valve; the controller is electrically connected with the liquid-phase pH detection device, the liquid-phase pH detection sampling valve, the dilute nitric acid control valve and the ammonia gas control valve respectively; and the controller is also used for receiving detection parameters of the liquid-phase pH detection device and adjusting the opening degrees of the dilute nitric acid control valve and the ammonia gas control valve, so as to adjust the liquid-phase pH value in the reactor. By adjusting the feeding ratio of the two raw materials of dilute nitric acid and ammonia gas, the liquid-phase pH value in the reactor can be directly controlled to be stable in a safe range. The pressure fluctuation in the reactor can be reduced, and the flow stability of ammonia gas and dilute nitric acid entering the reactor can be improved.

The invention discloses a method for comprehensively recycling yellow phosphorus slag of an electric furnace, and belongs to the technical field of chemical engineering. Comprising the following steps: grinding slag, adding nitric acid in proportion, reacting dicalcium silicate in the slag with nitric acid to generate calcium nitrate and silicon slag, and reacting calcium nitrate with ammonium carbonate to prepare an ammonium nitrate product and a calcium carbonate product; and washing and separating the silicon slag to obtain orthosilicic acid, returning one part of orthosilicic acid to be re-blended with the phosphate ore to enter the furnace so as to recycle the slag, and calcining the rest part of orthosilicic acid to obtain a white carbon black product. The use amount of silica is reduced, mineral resources of silica are saved, and the use amount of silica produced from yellow phosphorus reaches self-balance.

The present application belongs to the technical field of energy saving and consumption reduction of titanium dioxide production, and particularly relates to a method for energy saving and pollution reduction in the calcination process of sulfuric acid method titanium dioxide. The present application realizes the cascade utilization of high-temperature to medium-low-temperature waste heat through the integrated scheme of "preheating and quality improvement + oxygen-rich calcination + tail gas synergistic desulfurization and denitrification + resource utilization of by-products", that is, the calcination tail gas (1000-1100℃) is first used to generate steam for production through a waste heat boiler, and then is used for preheating and drying metatitanic acid after being cooled, thereby realizing the cascade utilization of high-temperature to medium-low-temperature waste heat, and simultaneously, the oxygen-rich combustion improves the fuel efficiency, the natural gas combustion is more sufficient, the energy consumption per unit product is reduced by 30-40%, and the ammonia method is used to simultaneously remove SO2 and NO x in a single reactor, the desulfurization efficiency is greater than or equal to 95%, the denitrification efficiency is greater than or equal to 85%, the concentration of dust in the tail gas after being removed by a bag filter is less than or equal to 10 mg / Nm3 for emission, the unity of environmental benefits and economic benefits is realized, and a new path is provided for the green upgrading of the sulfuric acid method titanium dioxide industry.

The application discloses a method and system for preparing ammonium bifluoride from hydrofluoric acid waste liquid, which comprises the following steps: (1) adding the hydrofluoric acid waste liquid into an electrolytic cell, transporting the electrolytic cell to a first reaction kettle after electrodepositing treatment, adding silicon dioxide, then stirring and reacting, and returning the generated silicon tetrafluoride and hydrofluoric acid into a spray tower to react and then return to the first reaction kettle, and then adding ammonia water to perform neutralization reaction; (2) filtering the solid-liquid mixture I, evaporating and drying the obtained filtrate I to obtain an ammonium nitrate product, and returning the obtained filter cake I to a second reaction kettle, adding ammonia water to adjust the pH value, and then stirring and reacting; (3) filtering the solid-liquid mixture II, returning the obtained filter cake II to the first reaction kettle for reuse, transporting the obtained filtrate II to a reactor, adding hydrofluoric acid to perform reaction, and then performing evaporation and drying treatment to obtain an ammonium bifluoride product. The method is simple in process, low in energy consumption, convenient to operate and convenient for industrialized production and application.

According to the papermaking flue gas environment-friendly treatment process, sodium bicarbonate and ozone have a synergistic effect, and the SO2 / NOx removal rate is higher than that of a single dry process (contrast 2); compared with a wet process (contrast 1), flue gas reheating is not needed, and energy consumption is remarkably reduced. According to the scheme, the purity of the byproduct gypsum is 93 or above, the byproduct gypsum can be directly used for building materials, and compared with an existing scheme, the operation cost is remarkably reduced. Therefore, through the two-stage synergistic desulfurization and denitrification and by-product regeneration process, the removal efficiency, the recycling rate and the economical efficiency are remarkably superior to those of a traditional technology, and the method is particularly suitable for high-sulfur, high-humidity and multi-pollutant coexisting papermaking flue gas treatment scenes.

The application provides a method for preparing carboxylic acid by hydrolysis of nitrile, wherein the nitrile and protonic acid are subjected to hydrolysis reaction in a microwave reactor in the presence of solid inorganic medium to obtain the carboxylic acid; wherein the frequency of the microwave reactor is 0.9-3.0 GHz; the nitrile is aliphatic nitrile, aromatic nitrile or a mixture thereof; the relative dielectric constant ε of the solid inorganic medium is 30-500. r The application realizes microwave-high dielectric medium coupling reinforcement through the cooperation of the solid inorganic medium with specific relative dielectric constant and specific microwave reaction condition, can realize the efficient obtaining of high-purity carboxylic acid product, and produces ammonium salt as by-product. The overall method has high yield, strong raw material universality, is easy to be industrialized and amplified, and has remarkable economic effect.

The utility model discloses a device for producing industrial ammonium nitrate and porous ammonium nitrate, belongs to the field of chemical treatment, solves the problem that an existing chemical production device cannot process different materials, and comprises a pretreatment assembly, a granulation part, a screening mechanism and an evaporation assembly, the pretreatment assembly is used for collecting and conveying an industrial ammonium nitrate solution and a porous ammonium nitrate solution, the industrial ammonium nitrate and the porous sodium nitrate can be efficiently and stably processed by arranging the pretreatment assembly, the granulation piece, the screening mechanism and the evaporation assembly, processing of the two solutions can be stably switched and changed, and the processing efficiency is improved. When two solutions are processed, all parts in the device need to be cleaned in advance, the situation that the two solutions pollute each other during processing is prevented, and therefore the stability of the whole device during operation is guaranteed, the processing cost during processing of the two solutions is reduced, and the working quality of the device is improved.

The utility model discloses a safe, efficient and energy-saving ammonium nitrate solution production system which comprises an efficient tubular reactor, a reactor flash tank and a reflux mixer, the efficient tubular reactor is communicated with the reactor flash tank and the reflux mixer, and an ammonia gas pipe and a nitric acid pipe are connected to the efficient tubular reactor. An adjusting loop is connected among the ammonia gas pipe, the nitric acid pipe and the efficient tubular reactor, the reflux mixer comprises a neutralization washing tower, and the reactor flash tank is further connected with a falling film primary evaporator. Compared with the prior art, the system provided by the utility model has the advantage that the ammonium nitrate solution can be prepared safely, efficiently and in an energy-saving manner by utilizing the pressurized tubular reactor and the MVR evaporator.

The invention relates to the technical field of wastewater treatment, and provides a method for recovering free ammonia in ammonium nitrate process wastewater, which comprises the following steps: S1, reacting gaseous ammonia with dilute nitric acid by using a pressurization neutralization process to obtain alkaline steam and an ammonium nitrate solution; s2, carrying out ammonium nitrate removal treatment on the alkaline steam through a fiber demisting catcher, and carrying out heat exchange to obtain condensate containing free ammonia; s3, the condensate containing free ammonia enters the upper section of an ammonia recovery system to be subjected to steam stripping treatment and then reacts with dilute nitric acid in the lower reaction section, pretreated ammonium nitrate process wastewater and an ammonium nitrate solution are obtained, and the ammonium nitrate solution is returned to an ammonium nitrate production system to serve as cooling liquid to be recycled; and S4, carrying out ion exchange resin treatment on the pretreated ammonium nitrate process wastewater to obtain a treatment solution. According to the technical scheme, the problems that the recovery effect of free ammonia in ammonium nitrate process wastewater is poor and the content of ammonium nitrate is high in the prior art are solved.

The present application discloses a denitrogenation method and various applications thereof. The denitrogenation method comprises: reacting a nitrogen-containing heteroaromatic compound, a hydrogen donor, a catalyst and a solvent in an oxygen-free environment to generate a nitrogen-containing inorganic compound and an organic compound without nitrogen-containing heteroatoms, wherein the hydrogen donor is not hydrogen.

This invention provides an apparatus and method for producing ammonium nitrate using air and water as raw materials. Compared with the prior art, the apparatus provided by this invention consists of a nitrogen generator, a plasma discharge device, a fixed-bed reactor, and an absorption tower. It employs sliding arc discharge and utilizes the heat generated by the discharge to heat the fixed-bed reactor, thereby achieving the discharge synthesis of NH3 and NO from nitrogen and water. x The method utilizes oxidation absorption to ultimately obtain ammonium nitrate solution. It uses only air and water as raw materials and avoids the high temperature and high pressure reaction conditions in the industrial synthesis of ammonium nitrate. It realizes a synthesis process driven only by renewable energy and can be applied to scenarios such as distributed energy storage and small-scale agricultural nitrogen fertilizer production.

The application discloses a kind of based on ammonium salt leaching agent cycle's smelting slag efficient low-consumption leaching method, belong to metallurgical solid waste resource utilization technical field.Water leaching is carried out to smelting slag, and the obtained water leaching residue is subjected to multistage countercurrent leaching using ammonium salt solution to obtain calcium-rich leaching solution, and the calcium-rich leaching solution is subjected to carbon fixation reaction with excess carbon dioxide gas to generate calcium bicarbonate solution;The calcium bicarbonate solution is subjected to neutralization precipitation with the obtained water leaching solution, liquid-solid separation, to obtain light calcium carbonate and ammonium salt solution, and the obtained ammonium salt solution is recycled for multistage countercurrent leaching.The method designs an ammonium salt solution closed-loop process and a calcium carbonate open-loop process, which not only reduces the acid and alkali consumption cost in the smelting slag leaching process, but also produces high-value light calcium carbonate products, realizes the resource utilization of all components of smelting slag, reduces the processing cost of smelting slag, and provides a new way for harmless, efficient and high-value utilization of steel smelting slag.

The invention discloses a filtering and recycling method and system for concentrated slurry of uranyl carbonate and ammonium diuranate in crystallization mother liquor, and relates to the technical field of uranium purification, the recycling method comprises the following steps: S1, adopting at least two solid-liquid separation devices which are arranged in parallel to carry out alternate circulating filtering treatment on tower bottoms of crystallization mother liquor containing uranyl carbonate and / or ammonium diuranate, filtering to obtain filtered clear liquid and an ammonia-containing filter cake; s2, carrying out air stripping treatment on the ammonia-containing filter cake obtained in S1 to separate ammonia-containing gas and obtain a solid material with low ammonia content; s3, carrying out absorption treatment on the ammonia-containing gas separated in S2 to obtain an ammonium-containing product; and S4, carrying out pyrolysis treatment on the solid material with low ammonia content obtained in S2 to obtain a uranium-containing product. Through cooperation of double-machine alternate circulating filtration, air stripping separation, absorption recovery and pyrolysis conversion, the technical problems of ammonia nitrogen pollution transfer, dependence on manual operation, long flow and high water content of a filter cake are solved.

Provided herein are systems and methods for producing renewable nitrogen products.

The invention discloses a preparation and application method of a photocatalytic denitration microreactor capable of realizing in-situ thermal regeneration of a catalyst, and relates to the technical field of photocatalytic denitration. The reactor is subjected to simple heating treatment, nitrate generated on the surface of the catalyst in the pyrolysis denitration process is converted into gaseous NO2 to be discharged out of the reactor, and in-situ regeneration of the catalyst is achieved. The method provided by the invention is used for long-acting removal of NO, is simple to operate, avoids complicated reactor disassembly and assembly steps, avoids a large amount of water resources required by traditional washing regeneration, and meets the production requirement of continuous denitration. The provided in-situ thermal regeneration micro-reactor denitration system not only improves the utilization rate of the catalyst, the energy efficiency and the space utilization rate, but also has a lasting and efficient denitration effect, certain economic value is generated while green denitration is guaranteed, and the in-situ thermal regeneration micro-reactor denitration system has wide application prospects.

In order to simply and efficiently treat nitrogen dioxide in cement exhaust gas and reduce environmental burden by a method for producing ammonium nitrate, the present invention comprises: a nitrogen dioxide recovery step for bringing nitrogen dioxide in cement exhaust gas into contact with water to form a liquid containing NOx; a reduction reaction step in which ammonia is generated by bringing a reducing catalyst into contact with the NOx-containing liquid; an ammonia recovery step in which the ammonia is gasified using the waste heat gas; a solid-liquid separation step in which the remaining part after ammonia recovery is subjected to solid-liquid separation and iron hydroxide is separated from the remaining part of NOx that is not used; a neutralization step for producing ammonium nitrate by bringing the separated liquid containing nitrate nitrogen and / or nitrite nitrogen and the separated liquid containing NOx into contact with ammonia recovered by gasification; and a catalyst production step in which the magnetite used in the reduction reaction step is obtained by reacting ferric sulfate with an aqueous sodium hydroxide solution and performing solid-liquid separation, and the aqueous sodium sulfate solution during the solid-liquid separation is separated into sodium hydroxide and sulfuric acid by electrodialysis, the sodium hydroxide is recycled in the preparation of the magnetite.

The application provides a recycling method of lithium iron phosphate black powder. The recycling method comprises the following steps: mixing the lithium iron phosphate black powder and a nitric acid solution, performing self-thermal oxidation to obtain an acidolysis recovery gas and an acidolysis solution, the acidolysis recovery gas containing carbon dioxide and nitrogen oxides; performing one-stage impurity removal leaching and oxidative leaching on the acidolysis solution, and performing solid-liquid separation to obtain an oxidative leaching solution and a filter cake; calcining the filter cake to obtain a ferric phosphate product; performing two-stage impurity removal leaching on the oxidative leaching solution to obtain a two-stage impurity removal leaching solution; introducing the acidolysis recovery gas into the two-stage impurity removal leaching solution to perform three-stage impurity removal leaching, and performing solid-liquid separation to obtain a three-stage impurity removal leaching solution and a lithium carbonate product; and concentrating and crystallizing the three-stage impurity removal leaching solution to obtain a nitric acid product and a carbonic acid product. The lithium iron phosphate black powder is comprehensively utilized by using the nitric acid solution, the comprehensive recovery of carbon, lithium, phosphorus and nitrogen elements is realized, the lithium recovery rate is greater than 95%, and the phosphorus recovery rate is greater than 98%.

The present invention relates generally to an ammonia capture system or method comprising plasma NOx and, more particularly to such system and method for ammonia capture comprising a two-tank NOx absorption system. Furthermore the present invention concerns a system to produce ammonium nitrate in solution or as a solid from atmospheric ammonium.

A method for producing ammonium nitrate includes a nitrogen dioxide recovery step of bringing nitrogen dioxide in a cement exhaust gas into contact with water to obtain an NOx-containing solution, a reduction reaction step of producing ammonia by bringing a reducing catalyst into contact with the NOx-containing solution, an ammonia recovery step of vaporizing the ammonia with a waste heat gas, a solid-liquid separation step of separating a residue after the ammonia recovery into iron hydroxide and an unused residue of NOx, a neutralization step of bringing the separated nitrate / nitrite nitrogen-containing solution and the NOx-containing solution into contact with the ammonia vaporized and recovered to prepare ammonium nitrate, and a catalyst production step in which magnetite used in the reduction reaction step is obtained by reacting iron sulfate with a sodium hydroxide aqueous solution and separating the mixture into solid and liquid, the sodium sulfate aqueous solution in the solid-liquid separation is separated into sodium hydroxide and sulfuric acid by electrodialysis, and the sodium hydroxide is used in a circulatory manner for preparing the magnetite, where the nitrogen dioxide in the cement exhaust gas is treated simply and efficiently while reducing environmental burden.

The disclosure pertains to an ammonium nitrate reactor with a first type static mixer in the mixing zone upstream of the tube bundle and / or a second type static mixer downstream of the tube bundle.

The present application relates to the technical field of reactor, and provides a safe starting method of ammonium nitrate volumetric reactor, which comprises the following steps: S1, saturated steam is introduced into a steam pipeline connected with the reactor to carry out hydrophobic preheating and pressure increasing operation until the pressure in the steam pipeline is stable; S2, liquid medium is added into the reactor to establish an initial liquid level; S3, saturated steam is introduced into the bottom of the liquid phase in the reactor by using the steam pipeline to heat and pressurize the liquid phase in the reactor, and ammonia gas is introduced into the liquid phase in the reactor to adjust the pH value of the liquid phase; S4, when the temperature of the liquid phase in the reactor, the top pressure, the pH value of the liquid phase and the pH value of the gas phase all reach preset starting conditions, ammonia gas and dilute nitric acid are put into the reactor to start the neutralization reaction to produce.The present application can eliminate the huge temperature difference between the reaction zone and the surrounding liquid phase from the source, improve the safety and stability of the starting process of the device, and improve the production efficiency.

An integrated process for the synthesis of ammonia and nitric acid, comprising the production of hydrogen from water electrolysis, controlled by selective switching between a first mode of operation and a second mode of operation, wherein in the first mode of operation, an excess of ammonia is produced and stored in a suitable ammonia reservoir; in the second mode of operation, ammonia from the ammonia reservoir is used to provide an additional input amount of ammonia for the production of nitric acid; the switching between the first and second modes is based on the amount of power delivered to the water electrolysis.

The invention relates to the field of ammonium nitrate solution preparation, and particularly discloses a method for purifying chloride ions in an ammonium nitrate solution and application of the method. The invention discloses a method for purifying chloride ions in an ammonium nitrate solution. The method comprises the following steps: performing reverse osmosis impurity removal on source water, and adding a chloride ion adsorbent to obtain desalted water; ammonia gas and oxygen react to generate nitrogen oxide, and the nitrogen oxide and desalted water react to generate dilute nitric acid; gasifying the liquid ammonia to obtain ammonia gas, carrying out neutralization reaction on the ammonia gas and dilute nitric acid, and evaporating to obtain a high-concentration ammonium nitrate solution; the chloride ion adsorbent is sodium alginate coated activated carbon loaded silver ions. According to the method, the chloride ion adsorbent is added into the source water used during preparation of the ammonium nitrate solution, so that the concentration of chloride ions in the source water is reduced, and the chloride ions in the prepared ammonium nitrate solution are removed.

The utility model relates to a tubular reactor which can be used for producing ammonium nitrate. What is proposed is a tubular reactor for producing ammonium nitrate, comprising a chamber I for the introduction of reagents, to which a pipe A for supplying nitric acid and a pipe B for supplying ammonia are connected, a chamber II for mixing the reagents, a chamber III for the introduction of additional ingredients, to which a pipe C for supplying additional ammonia is connected, and an outlet chamber IV, the tubular reactor being characterized in that the chamber III for the introduction of additional ingredients has a pipe D connected thereto for supplying a cooling solution. The technical result consists in enhancing the safety of the ammonium nitrate production process by reducing the possibility (risk) of the thermal decomposition of ammonium nitrate and the accompanying risk of explosion.

The invention belongs to the field of ammonia recovery, and discloses a dynamic closed-loop dual-channel air plasma efficient ammonia capture intelligent regulation and control system, which mainly comprises a plasma discharge unit, an NH3 input unit, a mixed reaction chamber, a gas product detection module and an intelligent regulation and control system, all the units form an integral working system with interconnected functions through a gas circuit, a signal line and a control circuit. According to the invention, a continuous operation mode of discharging, trapping, reacting and regulating at the same time is realized through a modular design and a dual-channel collaborative reaction architecture, the resource utilization efficiency is improved, the complexity and the operation cost of a traditional ammonia treatment system are remarkably reduced, and the system has good engineering adaptability and popularization prospects.

The invention discloses a method for synthesizing ammonium nitrate through nitric acid reduction based on a palladium membrane reactor. According to the method, nitric acid generated by converting waste gas NOx through plasmas is used as a raw material, and electrochemical water electrolysis and chemical hydrogenation reaction are integrated in a double-chamber structure reactor separated by a hydrogen permeable palladium membrane. In the reaction process, active hydrogen generated by water electrolysis in the electrochemical cell is migrated to the side of the chemical cell through the palladium membrane, under the catalytic action of the catalyst loaded on the palladium membrane, the active hydrogen and nitric acid are subjected to a hydrogenation reaction to generate ammonia, and the generated ammonia is further combined with nitric acid in the chemical cell to generate ammonium nitrate. The method is simple and convenient to operate and mild in reaction condition, high-purity ammonium nitrate solutions with different concentrations can be prepared by regulating and controlling the initial concentration of nitric acid, and the method has the potential of being directly applied to crop fertilization and irrigation.

The invention relates to an ammonium nitrate reactor with a first type of static mixer in a mixing zone upstream of a tube bundle and / or with a second type of static mixer downstream of the tube bundle.

The disclosure pertains to an ammonium nitrate reactor with a first type static mixer in the mixing zone upstream of the tube bundle and / or a second type static mixer downstream of the tube bundle.

The present invention relates to an apparatus for production of ammonium nitrate from nitric acid and ammonia, where the apparatus has a recirculation circuit with a neutralization reactor (10) disposed within said recirculation circuit, where the neutralization reactor (10) has at least a first region (12) and a second region (14), where the first region (12) is upstream of the second region (14) in the recirculation circuit for flow purposes, where the first region (12) has at least one nitric acid supply apparatus (20), where the second region (14) is a shell-and-tube reactor, where the tubes (30) of the shell-and-tube reactor are designed for supply of ammonia, characterized in that the first region (12) has at least a first perforated plate (40), where the first perforated plate (40) is arranged at right angles to the flow direction, where the first perforated plate (40) is upstream of the nitric acid supply apparatus (20) in flow direction.