21 results about "Ammonium sulfite" patented technology

This invention discloses a system for producing ammonium sulfite using electrolytic manganese ammonium sulfate double salt. The system includes a drum high-temperature drying device. The electrolytic manganese ammonium sulfate mixture output from the drum high-temperature drying device is fed into a crushing device via an elevator. The electrolytic manganese ammonium sulfate mixture output from the crushing device is fed into an anaerobic calcining furnace. A three-stage electrostatic precipitator is connected to the rear end of the anaerobic calcining furnace. The exhaust gas, after dust removal by the three-stage electrostatic precipitator, is sent to a multi-stage absorption and conversion tower via an exhaust gas pipeline. The conversion liquid and the completed absorption liquid after passing through the multi-stage absorption and conversion tower are sent to an evaporation device. This system and method for producing ammonium sulfite using electrolytic manganese ammonium sulfate double salt improves the calcination effect through pretreatment such as drying and crushing, and ultimately converts the ammonium sulfate into sulfur dioxide through anaerobic calcination to prepare ammonium sulfite. The difference lies in the direct blending and calcination method used in domestic and international processes.

In a method for physical and thermochemical treatment of biomass, the biomass moisture content is reduced in a dryer and ammonia (NH3) is also released from the biomass during drying. The dried biomass is then either pyrolyzed in a pyrolysis reactor and the pyrolysis gas is forwarded to and combusted in a combustion device to form flue gas, or is combusted in a combustion facility unit to form flue gas. In either case the flue gas is fed to a mixer. Oxygen (O2) is metered to the flue gas in the mixer and is fed directly to the dryer as drying gas. As the drying gas passes through the dryer, the sulfur dioxide (SO2) contained in the drying gas and / or the sulfur trioxide (SO3) chemically reacts with the ammonia (NH3) to form ammonium sulfite ((NH4)2SO3) and / or ammonium sulfate ((NH4)2SO4). Also a treatment facility physically and thermochemically treats the biomass.

The invention discloses a preparation method of 4-bromophenylhydrazine hydrochloride, and relates to the technical field of organic synthesis, and the preparation method comprises the following steps: S1, diazotization: mixing 4-bromoaniline and concentrated hydrochloric acid, adding a sodium nitrite aqueous solution under a stirring condition, and reacting to obtain a reaction solution; step S2, reduction: adding concentrated hydrochloric acid and ammonium sulfite into the reaction liquid obtained in the step S1, reacting, separating out crystals, and filtering; s3, salifying: dissolving a product obtained after filtering in the step S2 in concentrated hydrochloric acid, stirring at 80-85 DEG C until crystals are separated out, and performing suction filtration and drying to obtain 4-bromophenylhydrazine hydrochloride; in the diazotization process in the step S1, the speed of adding the sodium nitrite aqueous solution is controlled to be 70-85 mL / min in the stirring process. By controlling the adding speed of the sodium nitrite, the speed of the sodium nitrite aqueous solution is controlled to be 70-85 mL / min, so that the diazonium salt decomposition caused by high sodium nitrite adding speed and excessive nitrous acid in the reaction is avoided, and meanwhile, the diazotization reaction time can be reasonably shortened.

This invention discloses a combined sulfur and arsenic inhibitor and its application, belonging to the field of mineral processing and flotation. The inhibitor comprises 1-2 parts calcium cyanamide and 4-8 parts ammonium salt, wherein the ammonium salt is one or both of ammonium thiosulfate and ammonium sulfite. This combined inhibitor exhibits good inhibition effects on pyrite and arsenopyrite, can be used under weakly alkaline conditions, reducing the amount of lime required; it has high selectivity, with virtually no inhibitory effect on copper sulfide ores; and it is highly adaptable, effectively inhibiting pyrite and arsenopyrite in copper sulfide concentrates containing chalcopyrite and bornite. The combined inhibitor of this invention requires a low dosage, effectively improving the grade of copper sulfide concentrate and reducing the arsenic content.

The application discloses a kind of carbon sequestration type concrete internal curing material based on NaX molecular sieve and preparation method thereof, belong to building material technical field.It is prepared by the following component raw materials by weight fraction: 15%~18% NaX molecular sieve, 8%~10% carboxymethyl cellulose, 6%~8% bagasse cellulose, 5%~10% polyvinyl alcohol, 24%~30% N-methylol acrylamide, 10%~15% maleic anhydride, 3%~4% xanthan gum, 2%~3% calcium silicate, 8%~10% pentaerythritol allyl ether, 10%~13% propylene glycol polyoxyethylene ether, 0.15%~0.2% glycerol dimethacrylate, 0.2%~0.4% triethylene glycol dimethacrylate, 0.3%~0.7% diallyl dimethyl ammonium chloride, 0.08%~0.5% ammonium sulfite, 1%~3% ammonia.The application develops a kind of concrete internal curing material with CO2 capture and storage function, not only presents good alkali absorption characteristics, improves the mechanical properties of concrete, simultaneously realizes carbon sequestration curing and carbon sequestration service in concrete internal curing process and service process, realizes the new building field carbon sequestration mode of CO2 capture-solidification-storage.

This invention discloses a method for preparing aluminum vanadate using waste SCR denitrification catalyst, comprising the following steps: (1) leaching the waste SCR denitrification catalyst with sulfuric acid and ammonium sulfite, filtering to obtain acid leaching solution and acid leaching residue; (2) oxidizing the acid leaching solution obtained in step (1) by passing ozone through it to obtain a precursor suspension; (3) subjecting the precursor suspension obtained in step (2) to a hydrothermal reaction, collecting the precipitate, filtering, washing, and drying to obtain aluminum vanadate. This invention also provides aluminum vanadate and its applications. The method for preparing aluminum vanadate using waste SCR denitrification catalyst of this invention comprehensively and efficiently utilizes vanadium and aluminum elements in the waste SCR denitrification catalyst. Without element separation, aluminum vanadate products are directly synthesized in solution and can be used as an adsorbent to adsorb uranium. This invention comprehensively utilizes both elements, greatly reducing waste liquid generation and shortening the process flow.

The invention belongs to the field of waste gas treatment, and particularly relates to a flue gas ammonia process desulfurization recovery method and system.The method comprises the steps that flue gas enters the bottom of a desulfurization tower, is evenly distributed through a first gas distribution brick layer and then continues to rise, the flue gas and desulfurization liquid sent by primary tail absorption liquid circulation are subjected to countercurrent removal, and most SO2 is removed; and then the flue gas is removed from the reverse flow of the desulfurization liquid circularly sent by the second-stage tail absorption liquid, and SO2 in the flue gas is further removed, so that the flue gas meets the standard requirement. And the desulfurized flue gas enters a second gas distribution brick layer to uniformly distribute the gas again, the uniformly distributed gas is washed, the entrained desulfurization liquid is removed, washing and cooling are performed, and finally the gas is discharged into the atmosphere. According to the method, ammonium sulfite is directly utilized, a drying and concentrating facility is omitted, an oxidation process is omitted, investment is reduced, and processes are reduced.

This invention discloses a coupled system and method for flue gas desulfurization and iodine-sulfur cycle hydrogen production based on ammonium sulfite cycling. The system consists of an ammonium sulfite cycling desulfurization unit and a semi-open-ring iodine-sulfur cycle hydrogen production unit. The ammonium sulfite cycle achieves efficient capture and enrichment of SO₂ from flue gas, with zero ammonia consumption and no escape. It constructs a closed-ring iodine and open-ring / semi-open-ring iodine-sulfur hydrogen production system, using flue gas SO₂ as the external sulfur source. The traditional 850℃ high-temperature decomposition step of iodine-sulfur with sulfuric acid is eliminated; hydrogen is produced only by decomposing hydrogen iodide at 300–450℃. Iodine is recycled in a closed-ring manner, with sulfuric acid as a byproduct. This invention simultaneously achieves deep flue gas desulfurization, sulfur resource utilization, and low-cost hydrogen production, significantly reducing energy consumption and operating costs. It possesses excellent environmental and economic benefits and is applicable to sulfur-containing flue gas treatment and hydrogen co-production scenarios in thermal power, steel, coking, and chemical industries.

The utility model belongs to the technical field of flue gas purification, and particularly relates to a semi-dry flue gas treatment system for denitration by utilizing ammonium sulfite generated by urea desulfurization. The system at least comprises a mixer and a bag-type dust collector which are communicated in sequence, the gasifier is communicated with the mixer; and the urea desulfurization system is communicated with the gasifier. According to the semi-dry flue gas treatment device, the cloth bag is used as a reactor, and ammonium sulfite generated by urea desulfurization is subjected to denitration semi-dry flue gas treatment. Based on the flue gas desulfurization system, the dedusted original flue gas is discharged after being denitrated and desulfurized, and ammonium sulfite is generated through urea desulfurization reaction and is further used for denitration.

The invention provides a rubber vulcanizing aid, a preparation method and application thereof. The rubber vulcanization aid is prepared from the following components in parts by weight: 60 to 80 parts of urea formaldehyde-ammonium sulfite compound, 3 to 8 parts of aminopropyl silane, 10 to 30 parts of carrier and 0.5 to 1 part of antioxidant, the rubber vulcanizing aid provided by the invention is stable in structure and resistant to high temperature, the aid is ensured to be still effective in rubber processing and vulcanizing processes, and high thermal stability is provided by covalent grafting; the molecular weight is large, the structural rigidity and mobility are reduced, and the appearance and physical property consistency of the product are improved; a plurality of active ammonium sulfite sites are uniformly distributed, multi-point activation is provided, and the vulcanization rate is increased; the stable covalent network structure can form a microcosmic uniformly dispersed auxiliary phase, is more beneficial to a rubber cross-linked network, reduces stress concentration points, has positive effects on aging resistance, heat resistance and oxidation resistance, and enhances the physical properties of rubber.

The application discloses a kind of ammonia desulfurization processing equipment and process of synergic oxidation, including tower cauldron, tower cauldron is sequentially provided with exhaust pipe, spray layer, air supplement layer, waste gas inlet, pulse aeration mechanism, liquid discharge pipe from top to bottom, pulse aeration mechanism includes outer cylinder, inner cylinder, main gas pipe, motor, inner cylinder is arranged in outer cylinder, inner cylinder is tubular structure, main gas pipe is connected with the inside of inner cylinder, the inner circumferential surface of outer cylinder and the outer circumferential surface of inner cylinder are tightly sealed and arranged, first vent hole is provided on outer cylinder, first vent hole is provided on inner cylinder, and first vent hole is matched with first vent hole, motor is used to drive inner cylinder relative to outer cylinder rotation.The application is oxidized by air in desulfurization reaction, reduces the concentration of ammonium sulfite, improves desulfurization efficiency, and uses pulse aeration oxidation to replace existing continuous aeration, further improves oxidation effect, saves energy, and reduces enterprise waste gas desulfurization cost.

The invention relates to the technical field of grass plant fiber raw material pulping, and particularly discloses a cotton stalk ammonium sulfite pulping cooking process which comprises the following steps: S1, adding dry cotton stalks, water, ammonium sulfite, a cooking aid A, a cooking aid B and a buffering agent into a cooking utensil, and sealing; wherein the weight of the cotton stalks is 1000 parts, the weight of the water is 2.5-3 times that of the cotton stalks, the weight of the ammonium sulfite is 240-260 parts, the weight of the cooking aid A is 0.8-1.2 parts, the weight of the cooking aid B is 0.8-1.2 parts, the weight of the buffering agent is 25-35 parts, anthraquinone is selected as the cooking aid A, and the cooking aid B is a cooking penetrant; s2, when the pressure of the digester is increased to 130 DEG C, steam is released slightly, then the temperature is increased to 135 + / -5 DEG C, heat preservation is conducted for 20-30 minutes, then the temperature is continuously increased, the temperature increasing time is not shorter than 40 minutes, and after the highest temperature reaches 175 + / -5 DEG C, heat preservation is conducted for 100 + / -5 minutes. The scheme is used for solving the problem that the potassium permanganate value is too high after cotton stalk pulping at present.

The invention relates to the technical field of precious metal refining, in particular to a preparation method of high-purity rhodium powder, which comprises the following steps: S1, mixing a raw material with rhodium content greater than or equal to 1% with caustic alkali and alkali metal peroxide, and carrying out alkali fusion treatment to obtain filter residues; s2, dissolving the filter residues with aqua regia to obtain filtrate. And S3, controlling the rhodium concentration and oxidation potential in the filtrate, adding ammonium chloride to obtain filtrate, and continuously adding sulfamic acid into the filtrate to obtain filtrate. And S4, dissolving the filter residue with an acid solution to obtain a filtrate. And S5, adding ammonium sulfite into the filtrate to obtain a new filtrate. S6, alkali liquor is continuously added, filter residues are obtained, the filter residues are dissolved, and new filtrate is obtained. And S7, adding ammonia water into the filtrate to obtain rhodium precipitate, and calcining and post-processing to obtain high-purity rhodium powder. The preparation method is generally suitable for low-grade and high-grade raw materials, the process is short, complex pretreatment is not needed, impurities such as ruthenium and iridium can be effectively removed, and the product purity is larger than or equal to 99.95%.

The present application relates to geothermal water composite corrosion and scale inhibitor, the scale inhibitor contains the following components: long chain alkyl-dimethyl-polyethylene glycol ammonium sulfite, organic phosphine compound, organic alkali, water-soluble inorganic zinc salt and water.The composite corrosion and scale inhibitor provided by the present application has good corrosion and scale inhibition effect in the low-temperature, oxygen-containing environment geothermal water system.

The invention relates to a method for the physical and thermochemical treatment of biomass (5), wherein the biomass (5) is reduced in its water content in a drying device (4) and additionally ammonia (NH3) is released from the biomass (5) during drying. Subsequently the dried biomass (5) is pyrolyzed in a pyrolysis reactor (2) and the pyrolysis gas is further conducted to a combustion device (3) and combusted there to flue gas, or combusted to flue gas in a combustion plant unit (17), which flue gas is introduced into a mixing device (9), respectively. In the mixing device (9) oxygen (O2) is metered into the flue gas and introduced as drying gas directly into the drying device (4). While the drying gas is conducted through the drying device (4), sulfur dioxide (SO2) and / or sulfur trioxide (SO3) contained in the drying gas chemically reacts with ammonia (NH3) to form ammonium sulfite ((NH4)2SO3) and / or ammonium sulfate ((NH4)2SO4). Additionally, the invention relates to a treatment device (1) for the physical and thermochemical treatment of biomass (5).

The invention discloses a low-sulfur flue gas spray washing and heat exchanger integrated desulfurization and white elimination treatment system and a treatment method thereof. The system comprises a heat exchanger and a four-zone desulfurization device along the flow direction of flue gas. According to the desulfurization device from bottom to top, an aeration device oxidized ammonium sulfite is arranged in a slurry pool area; the absorption washing area is provided with a liquid distributor I for spraying desulfurization slurry to absorb acid gas in a countercurrent manner; a liquid collector, a water washing filler layer, a liquid distributor II and a circulating water washing system are arranged in the ultra-clean water washing area; and the demisting area is provided with a ridge type demister for demisting. And the DCS system intelligently regulates and controls operation. The method comprises the following steps: cooling flue gas, desulfurizing and washing, washing with water to remove glue, demisting and dehydrating, and exchanging heat to eliminate white smoke. The four areas cooperate to realize desulfurization and dust removal, and the outlet flue gas is heated to eliminate white smoke; the problems of large occupied area, high energy consumption and visual pollution in the traditional technology are solved by integrated heat exchange desulfurization white smoke elimination.

This invention provides a long-lasting salt-alkali resistant concrete internal curing material and its preparation method, belonging to the field of building materials technology. The material, by weight fraction, is made from the following components: 12%–17% nano-calcium carbonate, 3%–5% halloysite, 10%–12% sodium humate, 6%–8% 3-aminopropyltriethoxysilane, 5%–10% sodium carboxymethyl cellulose, 3%–4% λ-type carrageenan, 1%–2% locust bean gum, 1%–1.8% slaked lime, 26%–30% first part N-hydroxymethylacrylamide, 20%–23% hydroxyethyl methacrylate, 5%–8% methacrylic acid, 0.2%–0.3% alumina, 0.2%–0.5% second part N-hydroxymethylacrylamide, and 0.5%–1% ammonium sulfite. This material not only possesses salt-alkali resistance but also significantly reduces concrete shrinkage and improves mechanical properties.

The utility model provides an ammonia-process flue gas desulfurization device, and relates to the technical field of chemical raw material production, the ammonia-process flue gas desulfurization device comprises a preliminary filter, tail gas flue gas formed after industrial production enters the preliminary filter, large-particle dust is preliminarily filtered through the preliminary filter to form preliminary flue gas, at the moment, the temperature is high, the flue gas enters a desulfurization tower body, and the flue gas enters the desulfurization tower body; the flue gas is in a concentration and crystallization section, is subjected to spray cooling through the concentration and crystallization section and continuously rises, an ammoniated mixed solution is conveyed to an absorption section through an oxidation section, the cooled primary flue gas in the absorption section is in countercurrent contact with the sprayed ammoniated mixed solution for desulfurization reaction, SO in the flue gas is absorbed to form ammonium sulfite, and the flue gas continuously rises to a demisting section; ammonia liquid and water mist in the flue gas are intercepted through the demisting section, so that relatively pure flue gas only containing a small amount of small particles and aerosol is obtained, and at the moment, the small particles and the aerosol are further removed through the electric dust remover, so that the flue gas is discharged into the atmosphere.

The application discloses a novel method and device for resource conversion of sulfur hexafluoride. The method comprises the following steps: firstly, performing primary discharge treatment on SF6 to dissociate SF6 into fluorine atoms and low-fluorine sulfides; secondly, performing fluorination reaction of the fluorine atoms and the low-fluorine sulfides with tungsten to convert the fluorine atoms and the low-fluorine sulfides into WF6 and reduce sulfur into elemental sulfur; thirdly, controlling the fluorination reaction temperature to be 120-160 DEG C to make the generated elemental sulfur into liquid state, so that the elemental sulfur is conveniently collected; fourthly, condensing mixed gas containing WF6, collecting the liquefied WF6, mixing the condensed mixed gas with water vapor, and performing secondary discharge treatment on the mixed gas containing water vapor; under the action of the water vapor, the mixed gas is further degraded, and the degradation products tend to be SO2 and HF; fifthly, separating the SO2 and the HF; sixthly, treating the HF by using a "hydrogen fluoride-liquid ammonia" liquid phase method to obtain ammonium fluoride and ammonium bifluoride; and seventhly, treating the SO2 by using a wet ammonia method to obtain ammonium sulfite and ammonium sulfate.

The invention provides caramel color, a preparation method thereof and a seasoning containing the caramel color. The preparation method of the caramel color comprises the following steps: S1, carrying out ammonia-process caramel color process pretreatment on syrup by using a first ammonium salt to obtain a pretreated caramel color product with a first color index; s2, adjusting the pH value of the pre-treated caramel color product to 1-10, and then continuously performing ammonia process caramel color process pre-treatment to obtain an intermediate caramel color product with a second color index; s3, the intermediate caramel color product is subjected to ammonium sulfite method caramel color process treatment through second ammonium salt and sulfite, a caramel color product with a third color degree is obtained, and the first color degree, the second color degree and the third color degree are sequentially increased. The tinting strength and the safety of the caramel color are improved.

This invention belongs to the field of solid ammonium sulfite technology, and provides a filling device and method for solid ammonium sulfite. The device includes a cylinder with a pre-discharge cylinder slidably connected to its bottom. A pre-discharge mechanism is located at the bottom of the pre-discharge cylinder. The filling mechanism includes a discharge cylinder located at the bottom of the pre-discharge mechanism. A tail gas extraction component is fixed to the outer wall of the discharge cylinder, and a tail gas pipe is provided on the tail gas extraction component. The tail gas pipe is connected to a tail gas treatment device. This invention provides simultaneous dust removal and exhaust, eliminating the need for manual bag compaction: through continuous negative pressure suction from the tail gas outer cylinder and tail gas holes, it can simultaneously extract ammonium sulfite dust and expanding air inside the bag during filling, suppressing dust overflow at the source. The material inside the bag remains compacted, eliminating the need for repeated manual lifting and compaction after filling, significantly improving efficiency.