421 results about "Acid water" patented technology

The invention belongs to the technical field of building materials, and particularly relates to a micro-expansion anti-cracking waterproof composite deep groove filler and a preparation method thereof. The micro-bulking anti-cracking waterproof composite deep groove filler provided by the invention comprises cement, gypsum, mineral powder, nano silicon oxide, coarse aggregate, fine aggregate, modified fibers, an expanding agent, a polycarboxylate superplasticizer and water. According to the invention, polyacrylamide, calcium sulphoaluminate and magnesium oxide are adopted to jointly form an expanding agent, and early-stage-late-stage full-period shrinkage compensation is jointly formed in a concrete hydration process, so that the density of the concrete is effectively improved, and the waterproof performance of the concrete is further improved; according to the invention, sodium dodecyl benzene sulfonate and propylene glycol block polyether are adopted to carry out compound modification on graphene oxide, and gamma-aminopropyltriethoxysilane is connected to the surface of basalt fiber, so that the bonding strength of basalt fiber and a cement matrix and the compactness of the cement matrix are improved, and the waterproof and anti-cracking properties of concrete are further improved.

The invention discloses proportioning and feeding equipment for preparing a polycarboxylate superplasticizer and a feeding method of the proportioning and feeding equipment, and relates to the technical field of polycarboxylate superplasticizer preparation, the proportioning and feeding equipment comprises a feeding tank body and a bearing bracket fixedly mounted below the outer part of the feeding tank body; a proportioning mechanism is arranged at the upper part in the feeding tank body, and the proportioning mechanism comprises a proportioning chassis; wherein the proportioning partition plates are distributed in an equal-angle manner; a feeding mechanism is arranged at the bottom of the proportioning chassis, the feeding mechanism comprises a feeding shaft barrel, and a telescopic sliding rod is arranged on the outer side of the bottom end of the feeding shaft barrel. According to the proportioning and feeding equipment for preparing the polycarboxylate superplasticizer and the feeding method of the proportioning and feeding equipment, various raw materials are stored through the areas separated by the proportioning partition plates in the feeding tank body, so that proportioning and feeding are performed under various requirements, and meanwhile, the mixing branches below the feeding tank body and the inclined scraping plates assist proportioning and mixing of the various raw materials; the preparation efficiency of the polycarboxylate superplasticizer is improved.

The invention relates to the technical field of building materials, and particularly discloses an aluminate amorphous strength accelerator for steam-curing-free concrete as well as a preparation method and application of the aluminate amorphous strength accelerator. The invention discloses an aluminate amorphous strength accelerator for steam-curing-free concrete. The aluminate amorphous strength accelerator is prepared from the following raw materials in parts by weight: 35 to 45 parts of calcium aluminate amorphous powder, 55 to 65 parts of high-activity gypsum, 1 to 2 parts of an early strength type powder polycarboxylic acid water reducing agent, 0.1 to 1 part of lithium salt, 0.1 to 0.5 part of a retarder, 0.02 to 0.05 part of a reinforcing agent and 1 to 3 parts of a nano early strength agent, the proportion of amorphous glass in the calcium aluminate amorphous powder is greater than 85%; the calcium aluminate amorphous powder and the high-activity gypsum are doped into the Portland cement for synergistic hydration, and the early strength type powder water reducing agent, the lithium salt, the reinforcing agent and the nano early strength agent are utilized for synergistic interaction, so that the early strength and the volume stability of the prefabricated part are improved.

The invention discloses a novel composite filling material for a coal mine and a preparation method thereof, and relates to the technical field of coal mine filling materials, the novel composite filling material comprises the following raw materials: a main gel system: magnesium slag powder, sulphoaluminate cement, calcined desulfurization gypsum, ordinary portland cement and fly ash; the pore and water locking system comprises water-absorbent resin and expanded perlite; the additive system comprises a composite additive, a polycarboxylic acid water reducer, hydroxypropyl methyl cellulose and sodium alginate; the sodium alginate is composite sodium alginate composed of high G type sodium alginate and low G type sodium alginate; by optimizing the component proportion and the preparation process and establishing an ordered construction mechanism of a gel network, the homogeneity, the stability and the mechanical property of the material are improved while high fluidity is maintained, and the material has a loose and light porous structure, shows relatively low density and good light property, and has good application prospects. And under the condition of high water-solid ratio, the concrete has excellent bleeding resistance, reasonable coagulation characteristic and continuous strength development capability.

The invention discloses a sprayable ECC for early-strength tunnel repair and a preparation method thereof. The sprayable ECC comprises the following components in parts by mass: 300-380 parts of Portland cement clinker, 25-40 parts of silica fume, 30-50 parts of superfine slag, 100-150 parts of quartz sand, 5-15 parts of a polycarboxylic acid water reducer, 5-10 parts of a nano CSH crystal nucleus suspension, 5-15 parts of mixed fibers, 0.4-1.2 parts of a polyether defoamer and 10-16 parts of an accelerator. And 72-92 parts of tap water. The jettable ECC has the technical requirements of ultrahigh early strength, ultrahigh ductility and jettable performance.

The invention discloses a polycarboxylate superplasticizer with a linear water-reducing rate as well as a preparation method and application of the polycarboxylate superplasticizer. The water reducing agent is prepared from a polyether macromonomer phosphating derivative, a carboxylic acid monomer, a sulfonic acid monomer, an ester slump retaining monomer, a linear regulation and control monomer and other units through a free radical emulsion polymerization process. Compared with a traditional polycarboxylic acid water reducer, the water reducer has more regular side chain arrangement, higher charge density, higher adsorption capacity and more stable dispersing performance, the water-reducing rate can be linearly increased along with the increase of the mixing amount within the effective mixing amount range, and the water-reducing efficiency is improved. The problem that the concrete fluidity is difficult to control due to nonlinear fluctuation of the water reducing rate of a traditional polycarboxylic acid water reducing agent is solved, and the method has important significance on improving the concrete construction stability and the engineering quality. The product provided by the invention has excellent mud resistance and slump loss resistance besides high linear water-reducing rate, is suitable for various cast-in-place and precast concrete projects, and has remarkable economic value and application prospect.

The invention discloses tetragonal system germanium dioxide and a hydrothermal synthesis method thereof. According to the method, hexagonal crystal system germanium dioxide is taken as a raw material, a hydrothermal reaction is carried out in an acidic aqueous solution, and efficient conversion from a hexagonal crystal system to a tetragonal crystal system is realized by controlling the reaction temperature to be 120-240 DEG C, the reaction time to be 24-48 hours and the pH value to be 1-3. According to the preferable scheme, the raw materials are subjected to calcination pretreatment at the temperature of 500-600 DEG C, the yield of the tetragonal crystal phase can be remarkably increased, and the synthesis temperature can be reduced to 120 DEG C. According to the invention, stable synthesis of tetragonal system germanium dioxide is realized for the first time under the mild condition of 240 DEG C and below, and the technical problem that high-temperature transformation at 1000 DEG C or above is needed in the traditional method is solved. The tetragonal crystal system germanium dioxide prepared by the method is of a regular polyhedral structure, has the particle size of 400-500nm, and can be used as a high-efficiency catalyst for polyester synthesis. The process is energy-saving and environment-friendly, the total utilization rate of the raw materials is increased by recycling the waste liquid, and the process has remarkable industrial application value.

The application provides an ultra-high performance concrete and a preparation method thereof, and the concrete comprises the following raw materials in parts by weight: cement 260-280 parts, modified quartz sand powder 120-160 parts, modified steel fiber 8-15 parts, fly ash 20-26 parts, polycarboxylic acid water reducing agent 7-12 parts, EVA emulsion 16-24 parts, alkali-resistant glass fiber 4-7 parts, and water 140-180 parts. The preparation method of the modified steel fiber is as follows: the steel fiber is soaked in a potassium hydroxide solution and then dried, the dried steel fiber is added into a calcium hydroxide slurry, potassium carbonate is added for a first stirring reaction, a mixed solution of nano-SiO2 and a coupling agent is further added for a second stirring reaction, filtration and drying are performed, and the modified steel fiber is obtained. The ultra-high performance concrete prepared by the application has scientific proportioning of various raw materials, good toughness, strength and crack resistance, and can effectively improve the service life of the concrete.

The invention relates to the technical field of building materials, and discloses a mortar containing a nanometer material and a preparation method thereof, the mortar comprises 70-80 parts by weight of cement, 8-12 parts by weight of fly ash, 0.4-0.5 part by weight of a polycarboxylic acid water reducer, 0.4-0.6 part by weight of hydroxypropyl methyl cellulose, 1-2 parts by weight of the nanometer material, 2-3 parts by weight of modified silk fibroin and 40-50 parts by weight of water. Wherein the modified nano silicon dioxide is modified by gamma-aminopropyltriethoxysilane, the modified cubic nano calcium carbonate is subjected to compound modification by fumaric acid, sodium stearate and palmitic acid, and the modified silk fibroin is prepared by grafting modification by bis-aminopropyl terminated polysiloxane. According to the mortar, through optimization of component matching and modification treatment of the nano material and the silk fibroin, the mechanical property, durability and crack resistance of the mortar are remarkably improved, and the cost is controllable.

The utility model discloses a sodium humate purifying device which comprises a hopper, a water inlet and a water outlet, the reaction assembly is assembled at the bottom of the hopper and is used for producing sodium humate; the precipitation assembly is assembled on one side of the reaction assembly and is used for precipitating the reacted solution; the acid water treatment assembly is assembled on one side of the precipitation assembly and is used for absorbing acid liquor; when the sodium humate purifying device is used, firstly, a sodium humate solution subjected to primary treatment is fed into the neutralizing tank through the connecting pipe, at the moment, the pH value of the solution is monitored in real time through the pH value detector, and if the pH value does not meet the requirement, the adding amount of the neutralizing solution in the input pipe is adjusted through the control valve; the sodium humate purifying and drying barrel is used for purifying sodium humate, the solution reaches a proper pH value, then the solution enters the heat preservation barrel through the conveying pipe, the electromagnetic heater is used for heating and drying the solution, the purified sodium humate is dried in the purifying and drying barrel, and finally the product is taken out through the discharging port.

The invention discloses an ultrahigh-fluidity hydrophobic toughening composite grouting material and a preparation method and application thereof, and belongs to the technical field of geotechnical engineering, the ultrahigh-fluidity hydrophobic toughening composite grouting material comprises the following raw materials: cement, fly ash, silica fume, a polycarboxylic acid water reducer, a polyether defoaming agent, calcium stearate, an ethylene-vinyl acetate copolymer and water. According to the invention, through the collaborative design of a composite gel system composed of cement, fly ash and silica fume, calcium stearate and ethylene-vinyl acetate copolymer (EVA), a novel grouting material which can synergistically give consideration to ultrahigh fluidity, excellent hydrophobicity and good mechanical properties is prepared; and a high-performance grouting material support is provided for effective prevention and control of water inrush disasters under complex hydrogeological conditions of deep mines.

The invention provides a collagen nano dispersion preparation as well as a preparation method and application thereof. The preparation method of the collagen nano dispersion preparation comprises the following steps: S1, dissolving type I collagen and type III collagen in an acidic aqueous medium to prepare a collagen solution; s2, regulating and controlling the temperature, the pH value and the ionic strength of the collagen solution, so that the collagen solution is self-assembled; and S3, when the average particle size of the collagen fibers reaches a target range, performing dynamic freezing on the self-assembly system. The preparation and stable dispersion of the nano-scale collagen fiber can be realized without chemical crosslinking, the uniformity, biocompatibility and safety of the product are remarkably improved, and the nano-scale collagen fiber has excellent water-light effects and the like, and can be widely applied to the field of medical cosmetology.

The invention provides a condensate water treatment device for a gas water heater and the gas water heater, and the condensate water treatment device comprises a water collecting tank used for collecting acidic condensate water generated in the heat exchange process; the neutralization material box is filled with a neutralizer and is used for carrying out a neutralization reaction on the acidic condensate water; the atomizer is used for atomizing the neutralized condensate water; one end of the U-shaped diversion channel is communicated with the bottom of the water collecting tank, the other end of the U-shaped diversion channel is communicated with the atomizer, and a neutralization box is formed at the bottom of the U-shaped diversion channel. The bottom of the U-shaped flow guide channel is constructed to be a neutralizing material box, so that acidic condensate water must pass through a U-shaped bottom area filled with a neutralizing agent in the process of flowing from the water collecting tank to the atomizer. According to the structure, the condensate water is forced to finish neutralization reaction under the driving of gravity and then enters the atomizer, so that the atomized liquid is neutral water, and the environment or a building structure is prevented from being corroded by discharge of acidic water mist. The whole process depends on gravity to naturally flow, and extra power components are not needed.

The processes disclosed herein are environmentally friendly technologies to produce biocarbon products with low water intensity as well as low carbon intensity. Some variations provide a low-water-intensity process for producing a biocarbon product, comprising: providing a starting feedstock comprising biomass and water; drying the starting feedstock to generate a dried feedstock and a first vapor; pyrolyzing the dried feedstock to generate hot solids and a second vapor; condensing the first vapor to generate a first condensed liquid having a first pH from about 1 to about 7; condensing the second vapor to generate a second condensed liquid having a second pH from about 1 to about 7; forming acid water comprising the first condensed liquid, the second condensed liquid, or a mixture thereof; washing and cooling the hot solids using the acid water, to generate washed, cooled solids; and recovering the washed, cooled solids as a low-water-intensity biocarbon product.

The application discloses a kind of acid mine wastewater treatment system and processing technology thereof, belong to wastewater treatment technical field, the system includes acid mine wastewater regulating tank, tailings slurry tank, first thickening tank, secondary thickening tank, sludge regeneration tank and sludge thickening tank, acid mine wastewater regulating tank is connected by acid water pump with the water inlet of first thickening tank, tailings slurry tank is connected with the first thickening tank, the water outlet of first thickening tank is connected with secondary thickening tank, the sludge inlet of secondary thickening tank is connected with sludge thickening tank;The sludge inlet of sludge regeneration tank is connected with the sludge discharge port of secondary thickening tank, the sludge discharge port of sludge regeneration tank is connected with the sludge inlet of sludge thickening tank, and waste water treatment is carried out using the system.The application utilizes pyrite beneficiation process tailings slurry cooperates fly ash and active sludge to treat acid mine wastewater, can remove heavy metal simultaneously, realizes acid mine wastewater resource utilization, protects the ecological environment of mining area, reaches the purpose of green production of mine safety.

The invention belongs to the technical field of waste acid treatment, and particularly relates to an efficient concentration process for waste acid in phenylenediamine production. According to the high-efficiency concentration process for the waste acid generated in phenylenediamine production, multi-stage concentration and resource recycling are combined, impurities are removed through pretreatment of the composite adsorbent, and the adsorbent is recycled and regenerated through magnetic separation; according to the invention, waste acid is extracted from 70-75% to 95.5-96% through first-stage vacuum concentration, second-stage vacuum concentration and pot-type three-stage concentration, and the waste acid can be reused in a second-stage nitrification process, so that cyclic utilization is realized, and the consumption of raw materials is reduced. According to the process, pot-type concentrated high-temperature tail gas is used as a first-stage vacuum concentration heat source to recover waste heat, and external energy consumption is reduced; diluted acid water is separated through a pervaporation membrane, recycled water is used for washing, concentrated dilute acid is recycled for pretreatment, closed cycle emission reduction is formed, and the requirements for green, low carbon and circular economy are met. Meanwhile, by means of composite adsorbent magnetic separation, corrosion-resistant material application and an efficient composite membrane technology, the system stability and efficiency are improved, the service life of equipment is prolonged, and the maintenance cost is reduced.

Exemplary methods and techniques anodize a metallic substrate. Exemplary metallic substrates may include aluminum or aluminum alloys. The formation of a metal oxide layer on the metallic substrate may occur in an electrolytic system. Exemplary electrolytic systems may comprise at least one electrode connected to a voltage-generating device and an aqueous acid solution. Exemplary aqueous acid solutions may comprise phosphoric acid, boric acid, and water.

The present application relates to the field of fluidized solidified soil, and discloses a kind of high-flow self-compacting fluidized solidified soil and its preparation process, including dry base engineering slag soil, mixing water, sodium hexametaphosphate, L (+) -tartaric acid, composite cementitious material, warm rubber dry powder and isoamyl alcohol polyoxyethylene ether polycarboxylic acid water reducing agent are made.The composite cementitious material is premixed with warm rubber dry powder;Slag soil is mixed with water and sodium hexametaphosphate to disperse internal mud group;Under continuous stirring, add tartaric acid aqueous solution, control the drop amount by using real-time monitoring of liquid phase pH value and closed-loop mechanism of tartaric acid consumption ratio, neutralize alkaline and inhibit early hydration heat release of cementitious material;Finally, add powder and water reducing agent for secondary stirring, and discharge and pour when liquid phase pH value jumps.The present application overcomes the hydration out of control caused by the fluctuation of different slag components through chemical synergy and dynamic feeding feedback of multiple components, avoids settlement stratification and bleeding, and ensures the stable development of high-flow state and later mechanical strength of slurry.

The utility model relates to a novel polycarboxylate water reducing agent liquid drying device belongs to water reducing agent processing technical field. Mainly include frame, drying tank, main stirring shaft, vice stirring shaft, electric heating tube and drive mechanism, drying tank is double -layer shell structure, interlayer spiral coiled electric heating tube, and main stirring shaft and vice stirring shaft cooperate through drive mechanism, and vice stirring shaft can realize positive -negative rotation, and the uniformity of liquid turning over is improved significantly, and vice stirring blade and vice stirring blade are set up in the reverse direction, form cross flow effect, further strengthen stirring efficiency, drying tank shell is wrapped and is kept warm shell cover, and the heat loss is reduced, and the heat energy utilization rate is improved. The utility model can effectively solve the existing drying device turning over not fully, the problem of uneven heating, greatly shorten drying time, improve drying efficiency and product quality.

This utility model discloses a furnace ash acidic water treatment system, including a furnace ash conveying mechanism, a treatment mechanism connected downstream of the furnace ash conveying mechanism, and an intelligent control system. The treatment mechanism is also connected to an acidic water source for the synergistic treatment of acidic water and furnace ash. The intelligent control system is connected to the furnace ash conveying mechanism and the treatment mechanism to form a control and regulation loop that collects, stores, calculates, and regulates the output. This utility model combines the treatment of furnace ash and acidic water in an acrylonitrile co-processing unit, achieving "waste-to-waste" treatment, reduction of waste, and resource utilization, reducing the consumption of alkaline solutions for acidic water, and improving the economic efficiency of the system. Simultaneously, the intelligent control system enables automated operation of the system, reduces the frequency of manual operation, and solves the problems of over-adjustment, frequent adjustment, and instability that easily occur in traditional PID logic control, achieving rapid, stable, and precise control of the system.

The invention relates to the technical field of concrete admixtures, in particular to a preparation method of a high-performance concrete retarder. According to the method, graft copolymerization and supramolecular chemical modification are organically combined, firstly, straw fibers serve as a matrix and are subjected to free radical graft copolymerization with acrylic acid and acrylamide, carboxyl and amide functional groups are introduced, and nanofibers with a slow release function are formed; then constructing a dynamic network structure with sodium gluconate and zinc ions through supramolecular self-assembly (hydrogen bonds and coordinate bonds), compounding with the modified sweet potato powder, and performing swelling treatment to obtain the retarder. According to the retarder prepared by the method, the initial setting time reaches 9-10 hours, the final setting time reaches 10-11 hours, the compressive strength of 3d exceeds 45MPa, the compressive strength of 28d reaches 75MPa or above, and the retarder has good compatibility with a polycarboxylate superplasticizer and is free of the problem of condensation sensitivity. The method is suitable for the low-carbon fields of maritime work cement, light building materials and the like.

An apparatus (100) for producing an acidic aqueous solution includes: an electrodialyzer (110) that has a monovalent ion perm-selective ion-exchange membrane and separates wastewater containing chloride ions and alkali metal ions into electrodialysis concentrated water and electrodialysis diluted water by an electrodialysis treatment; an electrolyzer (120) includes an anode that that electrolyzes the electrodialysis concentrated water to produce an acidic aqueous solution; and a first circulator (13) that circulates at least some of the acidic aqueous solution to the wastewater supplied to the electrodialyzer (110), and that adjusts a pH of the wastewater supplied to the electrodialyzer to 3 to 9.

The invention relates to the technical field of concrete admixtures, and particularly discloses a rapid dispersing type polycarboxylate superplasticizer and a preparation method thereof.The rapid dispersing type polycarboxylate superplasticizer is prepared from, by mass, 200-300 parts of polyether monomer, 1.5-3.5 parts of oxidizing agent, 0.2-0.5 part of reducing agent, 1.2-3 parts of chain transfer agent, 25-33 parts of unsaturated acid, 10-20 parts of self-made functional monomer modified alkyl glycoside, 5-10 parts of aconitic acid and 250-300 parts of tap water. The preparation method comprises the following steps: dissolving, preparing a solution A, preparing a solution B and synthesizing to prepare the quick dispersing type polycarboxylic acid water reducing agent. By introducing alkyl glycoside, wetting of cement particles is promoted, water-cement interfacial tension is rapidly reduced, meanwhile, cement particle aggregation is hindered through stereoisomerization of alkyl glycoside, the effect of rapid dispersion of cement particles is achieved, and modified alkyl glycoside provides adsorption points and electrostatic repulsion of cement particles to hinder cement particle aggregation, so that the cement particles are dispersed rapidly. The cement particles can be quickly dispersed in a low-temperature environment.

The invention provides an intelligent fermentation system and method used based on a building pig house. The system comprises a hot water source system, a fermentation system, an acid supply system, a monitoring system and an automatic acid preparation system, the hot water source system is used for providing hot water for different fermentation tanks and ensuring that the temperature of the whole fermentation room is constant; the fermentation system is used for controlling different valves and motors to operate in different fermentation stages; the acid supply system is used for realizing acid-water proportioning in the fermentation room and supplying the mixed fermentation liquor into a trough of the building pig house; the monitoring system is used for acquiring monitoring information, supply information and abnormal information, and sending the monitoring information, the supply information and the abnormal information to the cloud platform; and the automatic acid preparation system is used for receiving the acid preparation instruction sent by the fermentation system, automatically preparing acid according to the acid preparation instruction, and directly storing the prepared acid in a temporary storage barrel.

The utility model relates to a tail end liquid-gas separation device of an acid regeneration washing tower, which comprises a tower drum of the washing tower, a circle of supporting step is arranged on the inner wall of the tail end of the tower drum, a liquid-gas separation mechanism is arranged on the supporting step, the liquid-gas separation mechanism comprises a supporting rod and a plurality of baffles, each baffle is provided with a through hole, and the through holes are communicated with the supporting rod. The supporting rods connect all the baffles in series through the penetrating holes, the outer contours of the baffles connected in series are matched with the shape of the inner wall of the tower barrel, and an overflowing gap is formed between every two adjacent baffles. According to the utility model, acidic water mist in the flue gas is effectively intercepted before the flue gas is discharged out of the washing tower, so that liquid-gas separation is realized, and the problem of environmental pollution caused by high content of acidic liquid drops in the flue gas discharged by the acid regeneration chimney is solved.

The utility model discloses an electric control cabinet with a built-in electrolytic bath for an acidic electrolyzed oxidizing water generator, which comprises a cabinet body, the electrolytic bath, a brine pump and a PLC (programmable logic controller) are arranged in the cabinet body, a brine port is arranged on the left side of the cabinet body, and an acid water port, an alkaline water port and a waste water port are arranged on the right side of the cabinet body. The saline water connector is connected with the saline water pump, the saline water pump is connected with the electrolytic bath, the electrolytic bath is connected with the acid water connector, the alkaline water connector and the waste water connector, and the PLC is electrically connected with the electrolytic bath and the saline water pump. The acidic electrolyzed oxidizing water generator has the advantages that the electrolytic bath is arranged in the electric control cabinet of the acidic electrolyzed oxidizing water generator, so that on one hand, the occupied space of the whole acidic electrolyzed oxidizing water generator can be reduced, and the service life of the electrolytic bath is prolonged; on the other hand, the cost can be reduced because an outer frame does not need to be independently made for the electrolytic bath.

The invention belongs to the technical field of food additive preparation, and particularly relates to an acesulfame potassium hydrolysis process and application. The process adopts a secondary hydrolysis process, and comprises the following steps: introducing sulfonation liquid in a front section and washing acid water (2-4%) in a rear section into a first hydrolysis reactor, and accurately controlling the specific gravity of hydrolysis acid and temperature parameters (for example, the specific gravity is 1.2-1.3, and the temperature is-5 DEG C to 15 DEG C); materials in the middle of the first hydrolysis reactor continuously overflow into a second hydrolysis reactor (hydrolysis transfer kettle) containing a stirring pump and an external circulation pump, the reaction time is prolonged, mass transfer is enhanced through external circulation, and the material retention time is prolonged; and feeding the material in the second hydrolysis reactor into a hydrolysis layering tank, standing, separating an upper-layer acid phase, washing a lower-layer organic phase with water, and finally neutralizing with potassium hydroxide to obtain an acesulfame potassium crude product sugar water solution. The reaction sufficiency is improved through secondary hydrolysis, the temperature is stabilized, the ice maker load and the labor intensity are reduced, the process adaptability is enhanced, and the acesulfame potassium production stability and yield are effectively improved.

The invention relates to fiber composite reinforced concrete for maritime engineering and a preparation method thereof, and belongs to the technical field of building materials. The concrete per cubic meter is prepared from the following components: 580 to 650 kg of cement, 95 to 145 kg of active admixture, 1200 to 1320 kg of aggregate, 24 to 30 kg of fiber, 120 to 140 kg of mixing water, 16 to 20 kg of polycarboxylic acid type water reducing agent, 0.2 to 0.3 kg of industrial grade defoaming agent, 3 to 4 kg of composite type corrosion inhibitor and 0.8 to 1.0 kg of interface modifier. The preparation method comprises the steps of aggregate acid pickling, dry mixing, wet mixing, step-by-step fiber adding, pouring and composite curing forming. Through material compounding and process optimization, the problem that high strength, high durability and low cost of marine concrete are difficult to consider at the same time is solved, and the marine concrete is particularly suitable for severe ocean engineering such as offshore wind power foundations.

The invention provides a hyperbranched polycarboxylic acid water reducing agent as well as a preparation method and application thereof, and belongs to the field of synthesis of water reducing agents. When the hyperbranched polycarboxylate superplasticizer prepared by the preparation method provided by the invention is added into cement paste, the fluidity of the cement paste can reach 320mm; when the hyperbranched polycarboxylate superplasticizer is added into mortar, the water-reducing rate can reach 28.9%; when 0.5-1.5% of the hyperbranched polycarboxylate superplasticizer is added into experimental concrete, the slump is 200mm, the expansion degree is 387.5 mm, the compressive strength in 28 days can reach 27.4 MPa, the compressive strength is improved by 34% compared with the compressive strength of the concrete without the hyperbranched polycarboxylate superplasticizer, and the hyperbranched polycarboxylate superplasticizer has good dispersing performance and water-reducing rate for cement-based materials.

This application discloses a cobalt-supported peanut shell biochar / peracetic acid synergistic system for water treatment and its application. The synergistic system includes cobalt-supported peanut shell biochar, peracetic acid, and water. The cobalt-supported peanut shell biochar comprises a peanut shell biochar matrix and cobalt-containing substances supported on the matrix. The cobalt-containing substances include metallic cobalt and / or cobalt oxides. The mass ratio of cobalt-supported peanut shell biochar to peracetic acid is (2-132):1. The atomic ratio of cobalt to carbon in the matrix is ​​(0.2-0.3):1. The cobalt-supported peanut shell biochar has a mesoporous structure with a total pore volume of not less than 0.07 cm³ / g and a specific surface area of ​​not less than 100 m². 2 / g. When this synergistic system is used to treat water containing organic pollutants, especially sulfamethoxazole, it can achieve a removal rate of over 90% within 3-5 minutes. The system maintains high activity and good stability over a wide pH range and in the presence of common anions, exhibiting excellent continuous operation performance. The degradation pathway of this synergistic system is environmentally friendly and can effectively reduce the toxicity of the products.