42 results about "Ammonium sulfite" patented technology

The invention discloses a method for producing a green packaging material by using field planting tobacco waste, which comprises the following steps: by taking tobacco stems as raw materials, extracting to obtain high-purity nicotine, extracting active chemical components to obtain tobacco stem residues, primarily treating the residual tobacco stems by an extruding and tearing machine to cut off and separate the tobacco stems into shreds, and drying the shreds to obtain the green packaging material. The cut tobacco stems enter a closed reaction bin, steam heating is adopted, ammonium sulfite or sodium sulfite and sodium hydroxide are added, EDTA and the ammonium sulfite or sodium sulfite and sodium hydroxide solution can dissolve fibrous adhesive lignin in the tobacco stems, and the tobacco stems can be used for producing green packaging materials after further mechanical treatment. Tobacco stem waste residues obtained after nicotine and pectic substance extraction are used as plant fiber paper pulp for producing the green packaging material, holocellulose in the tobacco stem residues is fully recycled and subjected to high-value resource utilization, the waste recycling value is increased, and the problem of waste environmental pollution is solved.

The invention belongs to the technical field of environmental science and resource utilization, and relates to a rapid enteromorpha humification method and application, under the action of a catalyst, enteromorpha is humified by a hydrothermal method to obtain an enteromorpha-based bio-organic fertilizer; the catalyst is more than one of nano ferric oxide, nano ferric chloride, nano cuprous chloride and ammonium sulfite. According to the method, rapid humification of the enteromorpha is realized, the high-activity fertilizer is prepared, the pollution problem of the enteromorpha is effectively solved, and resource utilization of the enteromorpha is promoted.

A polyhydric alcohol amine absorbent suitable for a CO2 capture process from a flue gas with a low CO2 partial pressure, which takes continuous operation stability and safety into account. The polyhydric alcohol amine absorbent comprises the following main components: a main absorbent, an auxiliary absorbent, an antioxidant, a corrosion inhibitor and water, and the concentration of the absorbent is 22-58% by mass fraction, wherein the main absorbent comprises one or two of diethylenetriamine, N,N-diethylethanolamine and hydroxyethyl ethylenediamine; the auxiliary absorbent comprises one or two of monoethanolamine, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-ethyl-1,3-propanediol and 2-amino-2-methyl-1-propanol; the antioxidant comprises one or two of butanone oxime, acetoxime, hydrazine carbonate and ammonium sulfite; the corrosion inhibitor is sodium vanadate; and the balance is desalinated water.

The invention discloses a method and a system for adding a 3N electrolytic manganese metal additive. The method comprises the steps that S1, a manganese sulfate neutral solution is prepared, after manganese carbonate ore powder is subjected to acid dissolution, sodium dimethyl dithiocarbamate and a barium sulfide purifying agent are added to conduct impurity removal, purification and acid collection on the manganese sulfate solution, then air is introduced to remove iron, the manganese sulfate solution obtained after filter pressing is neutralized with ammonia water, the pH value of the solution is adjusted, and the qualified manganese sulfate electrolyte is prepared. According to the 3N electrolytic manganese metal additive adding method and system, an ammonium sulfite adding method is changed from adding in a manganese sulfate neutral liquid tank to dropwise adding an ammonium sulfite aqueous solution at a liquid inlet port of an electrolytic bath, and the concentration and the liquid inlet speed of the ammonium sulfite aqueous solution are controlled, so that the content of ammonium sulfite in the electrolytic bath is stable, and the condition of the electrolytic bath is stable; the addition amount of the additive is reduced, introduction of impurities is avoided, and meanwhile, oxidation-reduction reaction caused by too long retention time of ammonium sulfite in the liquid is reduced.

The invention belongs to a comprehensive utilization device and a comprehensive utilization method for acid gas of a synthetic ammonia device. Comprising a gasification system acid gas unit, a low-temperature methanol washing system acid gas unit and a conversion stripping tower acid gas unit, wherein the gasification system acid gas unit is respectively connected with a heat tracing gas inlet of a Claus combustion furnace and a heat tracing gas inlet of a waste gas combustion furnace in a sulfur preparation unit; an acid gas unit of the low-temperature methanol washing system is connected with an inlet of the Claus combustion furnace, and an acid gas unit of the conversion stripping tower is connected with an inlet of the waste gas combustion furnace; a top tail gas outlet of the waste gas combustion furnace is connected with a tail gas treatment unit, the tail gas treatment unit is coupled with an ammonium sulfite solution preparation unit, and the ammonium sulfite solution preparation unit is connected with an ammonium sulfate preparation unit; the system has the advantages that the acid gas in the ammonia synthesis device is comprehensively treated, the circulating operation of the whole system is realized, the environment-friendly emission problem of an enterprise is solved, and meanwhile, relatively large profits are brought to the enterprise.

The present invention relates to the technical field of flue gas purification. Specifically, it relates to a low-temperature desulfurization and denitrification flue gas purification device and a purification method. The bottom of the reaction tower of the device is provided with a flue gas inlet, and the top is provided with a flue gas outlet; the bottom of the reaction tower is also provided with an ammonia inlet; the bottom of the reaction tower is also provided with an ammonium sulfite powder inlet, and the ammonium sulfite powder inlet is communicated with an ammonium sulfite grinding device. The method first crushes and grinds ammonium sulfite solid, and then simultaneously feeds the ammonium sulfite powder, ammonia, and the flue gas to be purified into the reaction tower and mixes them; the temperature of the flue gas is 50°C to 200°C, and the pressure is 500 Pa to 2000 Pa; after the reaction is completed, the purification is completed. This method has a low reaction temperature and does not require a catalyst; it can simultaneously purify nitrogen oxides and sulfur dioxide in the flue gas in the same reaction tower, with low operating costs, simple process flow, and by-products being easy to recycle and reuse.

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 relates to the field of flue gas desulfurization, in particular to a system and a method for improving the quality of ammonium sulfate as a byproduct of ammonia desulfurization. The system comprises a desulfurization tower, a delivery pump, an oxidation circulation tank and a post-treatment device, two layers of sprayers are arranged in the desulfurization tower, and an ion exchange column is arranged in the oxidation circulation tank. The method comprises the following steps: (S1) reacting boiler flue gas with a lower spraying absorbent to obtain crude ammonium sulfite I and desulfurized flue gas; (S2) carrying out reaction on the desulfurized flue gas and the upwards sprayed circulating material to obtain crude ammonium sulfite II and purified flue gas; (S3) converting the crude ammonium sulfite I and the crude ammonium sulfite II into crude ammonium sulfate in an oxidation tank; (S4) in the presence of an absorbent and an oxidant, removing impurities from the crude ammonium sulfate in an oxidation circulation tank to obtain an ammonium sulfate solution; and (S5) taking part of the ammonium sulfate solution as a circulating material, and carrying out post-treatment on the rest to obtain an ammonium sulfate product. The carbon steel pipelines are adopted for conveying materials among the devices, and linings of the desulfurizing tower and the carbon steel pipelines are made of fluorine-containing materials, so that corrosion of the linings and the spraying devices can be reduced, and the quality of ammonium sulfate is improved.

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 invention provides a method for preparing ethanol and co-producing fulvic acid from straws, which comprises the following steps: adding a catalyst into the straws in an ammonium sulfite aqueous solution to carry out cooking treatment, and carrying out solid-liquid separation to obtain straw residues and filtrate; the filtrate comprises fulvic acid. The process flow is simple, and large-scale production is easy to realize.

The invention provides a method for preparing manganese sulfate from low-grade pyrolusite based on sulfite circulation, a manganese-based material is prepared through the difference of the solubility of sulfite by utilizing the characteristic that the solubility of manganese sulfite is far smaller than that of calcium sulfite and magnesium sulfite, and manganese sulfate widely applied to the battery positive electrode industry is obtained. The by-product sulfur dioxide is used as a reducing agent to leach pyrolusite, the leaching cost is reduced, compared with a pyrite leaching method, the slag yield is reduced, recyclable ammonium sulfite is used as an intermediate manganese precipitation impurity removal agent, compared with an existing high-purity manganese sulfate preparation technology, the method is more efficient, the reagent cost is reduced, the quality of the prepared manganese sulfate is kept at the high-purity level, and the method is suitable for industrial production. The calcium and magnesium impurity removal effect is good, materials are simple, cost is low, recycling of main substances can be achieved, and environment friendliness is achieved.

The application belongs to a synthetic ammonia device acid gas comprehensive utilization device and a comprehensive utilization method; including a gasification system acid gas unit, a low-temperature methanol washing system acid gas unit and a shift stripping tower acid gas unit, the gasification system acid gas unit is connected with the heat tracing gas import of the Claus combustion furnace and the heat tracing gas import of the waste gas combustion furnace in the sulfur preparation unit respectively; the low-temperature methanol washing system acid gas unit is connected with the import of the Claus combustion furnace, the shift stripping tower acid gas unit is connected with the import of the waste gas combustion furnace; the top tail gas outlet of the waste gas combustion furnace is connected with a tail gas treatment unit, the tail gas treatment unit is coupled with an ammonium sulfite solution preparation unit, the ammonium sulfite solution preparation unit is connected with an ammonium sulfate preparation unit; having comprehensive treatment of the acid gas in the synthetic ammonia device, and realizing the circulating operation of the whole system, not only solving the environmental protection emission problem of the enterprise, but also bringing great profit to the enterprise.

The invention provides an ammonia leaching recovery process taking ammonium sulfite and hydrazine hydrate as reducing agents, and belongs to the technical field of lithium ion battery recovery. The process provided by the invention comprises the following steps: mixing ammonia water, a reducing agent and a buffering agent to obtain an ammonia leaching solution; mixing the ammonia leaching solution with the waste ternary lithium ion battery positive electrode powder to carry out reduction reaction, and filtering to obtain a leaching solution and manganese-containing leaching residues; the reducing agent is ammonium sulfite and hydrazine hydrate. According to the method, efficient leaching of lithium, nickel and cobalt is selectively completed through an ammonium sulfite and buffering agent system, manganese is almost not leached and left in leaching residues, meanwhile, through cooperation with strengthened reduction leaching of hydrazine hydrate, sufficient leaching of lithium, nickel and cobalt is completed, reaction proceeding is accelerated, and the leaching efficiency is improved. The problem that the leaching efficiency is not high when a single reducing agent is used in the reduction ammonia leaching stage is solved, and subsequent separation steps are reduced.

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.

The invention discloses ammonia desulfurization synergistic oxidation treatment equipment and process, the ammonia desulfurization synergistic oxidation treatment equipment comprises a tower kettle, the tower kettle is sequentially provided with an exhaust pipe, a spraying layer, a gas supplementing layer, a waste gas inlet, a pulse aeration mechanism and a liquid discharge pipe from top to bottom, the pulse aeration mechanism comprises an outer cylinder, an inner cylinder, a main gas pipe and a motor, the inner cylinder is arranged in the outer cylinder in a penetrating manner, and the inner cylinder is of a tubular structure; the main air pipe is communicated with the interior of the inner cylinder, the inner circumferential surface of the outer cylinder is tightly attached to the outer circumferential surface of the inner cylinder in a sealed mode, a first ventilation outer hole is formed in the outer cylinder, a first ventilation inner hole matched with the first ventilation outer hole is formed in the inner cylinder, and the motor is used for driving the inner cylinder to rotate relative to the outer cylinder. Air is introduced in the desulfurization reaction for partial oxidation, the concentration of ammonium sulfite is reduced, the desulfurization efficiency is improved, existing continuous aeration is replaced with pulse aeration oxidation subsequently, the oxidation effect is further improved, energy is saved, and the waste gas desulfurization cost of enterprises is 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 invention discloses a system for quickly cooking and delignifying hard straws by an alkaline ammonium sulfite method, relates to the technical field of pulping and papermaking, and mainly aims to quickly soften and decompose the hard straws in the cooking process and create favorable conditions for taking the hard straws such as cotton stalks as pulping and papermaking raw materials. According to the main technical scheme, the system for rapidly cooking and delignifying the hard straw through the alkaline ammonium sulfite method comprises a pin drum meter, a pre-steaming spiral mechanism, a spiral feeder, a T-shaped pipe, a transverse pipe digester, a pressure rubbing and grinding machine, a vertical boiler digester and a spraying bin which are connected in sequence, wherein the pin drum meter, the pre-steaming spiral mechanism, the spiral feeder, the T-shaped pipe, the transverse pipe digester, the pressure rubbing and grinding machine, the vertical boiler digester and the spraying bin are connected in sequence; wherein the ammonium sulfite liquid inlet pipe and the magnesium oxide liquid inlet pipe are respectively connected to the T-shaped pipe.

The invention discloses a carbon sequestration type concrete internal curing material based on a NaX molecular sieve and a preparation method of the carbon sequestration type concrete internal curing material, and belongs to the technical field of building materials. The invention discloses a preparation method of a medicine. The molecular sieve adsorbent is prepared from the following raw materials: 15%-18% of a NaX molecular sieve, 8%-10% of carboxymethyl cellulose, 6%-8% of bagasse cellulose, 5%-10% of polyvinyl alcohol, 24%-30% of N-hydroxymethyl acrylamide, 10%-15% of maleic anhydride, 3%-4% of xanthan gum, 2%-3% of calcium silicate, 8%-10% of pentaerythritol allyl ether, 10%-13% of allyl alcohol polyoxyethylene ether, 0.15%-0.2% of glycerol dimethacrylate and 0.2%-0.2% of glycerol dimethacrylate. The water-based adhesive comprises the following components in percentage by weight: 0.4% of triethylene glycol dimethacrylate, 0.3%-0.7% of diallyldimethylammonium chloride, 0.08%-0.5% of ammonium sulfite and 1%-3% of ammonia water. The concrete internal curing material with the CO2 capturing and sealing functions is developed, the good alkali absorption characteristic is shown, the mechanical property of concrete is improved, meanwhile, carbon sequestration curing and carbon sequestration service are achieved in the concrete internal curing process and the service process, and a novel carbon sequestration mode of CO2 capturing, curing and sealing in the building field is achieved.

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 discloses a high-activity liquid fertilizer as well as a preparation method and application thereof. The high-activity liquid fertilizer is prepared from the following raw materials in parts by mass: 20 to 30 parts of urea, 8 to 12 parts of potassium sulfate, 10 to 15 parts of water-soluble phosphate fertilizer and 1 to 2 parts of trace element fertilizer. The water-soluble phosphate fertilizer is prepared from a papermaking black liquid high-activity extract and dihydrogen phosphate, the trace element fertilizer is composed of an algae high-activity extract and trace elements. According to the method, phenolic substances and organic alkaline substances are added into the papermaking black liquid, effective breakage of C-C bonds is realized by utilizing substances such as potassium tert-butoxide, sodium tert-butoxide and sodium ethoxide, and repolymerization of degradation products is effectively inhibited by adding substances such as phenol and cresol, so that the high-activity extract of the papermaking black liquid is obtained; aiming at algae organisms, after acid treatment, ammonium sulfite and ammonia water continue to react under the high-temperature and high-pressure conditions, so that the high-activity algae extract rich in sulfonic groups is prepared, and the prepared high-activity liquid fertilizer does not generate precipitates after being stored for 180 days under the low-temperature (4 DEG C) condition.

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.

This invention relates to the field of water treatment technology, specifically disclosing a method for concentrating high-hardness, high-salinity wastewater. The method includes the following steps: pretreating the wastewater with a reducing agent and an adsorbent, followed by concentration treatment using a high-pressure nanofiltration membrane and a high-pressure reverse osmosis membrane; wherein the reducing agent is at least one of sodium sulfite, sodium sulfide, ferrous sulfate, or ammonium sulfite; and the adsorbent is a chitosan / modified lignin / nano-sodium titanate hybrid hydrogel, prepared by free radical polymerization of modified lignin, chitosan, acrylic acid, and nano-sodium titanate as monomers. The concentration method of this invention pretreats the wastewater with a reducing agent and an adsorbent, effectively reducing the wastewater's color and COD, removing heavy metal ions, simplifying the wastewater composition, significantly reducing scaling tendency, and allowing it to enter the nanofiltration system for treatment without complex pretreatment, thus reducing the pressure on subsequent systems and the scale requirements.