134 results about "Hemihydrate" patented technology

The invention discloses a method for selectively and efficiently removing impurities in desulfurized gypsum and preparing high-quality alpha-semi-hydrated gypsum, which comprises the following steps: (1) removing organic impurities in the desulfurized gypsum by utilizing flotation, then removing soluble impurities by washing, and aerating air to oxidize calcium sulfite into calcium sulfate dihydrate while washing, then carrying out acid leaching in a hydrochloric acid solution to remove insoluble impurities, taking out and drying to obtain treated desulfurized gypsum; and (2) adding the desulfurized gypsum treated in the step (1) into a carboxylic acid aqueous solution to carry out solution crystallization reaction, adding potassium carboxylate into the carboxylic acid aqueous solution to regulate and control the crystallization rate and crystal morphology, carrying out solid-liquid separation after the reaction is finished, and washing, drying and ball-milling the solid to obtain the high-quality alpha-semi-hydrated gypsum powder. The alpha-semi-hydrated gypsum product obtained by the invention is high in purity, and the hydrated body has high absolute dry compressive and flexural strength.

The invention relates to the field of preparation of concrete materials, and particularly discloses a high-matching-degree concrete shrinkage compensation additive and application thereof. The additive comprises the following components in parts by weight: 3-20 parts of aluminoferrite mineral powder and 6-26 parts of a modified regulating agent. Wherein the preparation of the modified regulating agent comprises the following steps: (1) mixing a composite modifier composed of dihydrate gypsum powder, a regulating agent and sulfate, calcining in stages, and quenching after the calcination is completed, so as to obtain the beta-type modified semi-hydrated gypsum. And (2) uniformly mixing the beta-type modified semi-hydrated gypsum with anhydrous gypsum powder, then uniformly mixing the obtained mixed powder with liquid polyethylene glycol, standing and aging to obtain the modified regulating agent. According to the high-matching-degree concrete shrinkage compensation additive, expansion can be precisely regulated and controlled in stages, and the adopted industrial solid waste serves as the raw material, so that the cost is reduced, and resource utilization is achieved.

To provide a cement composition comprising Portland cement and hemihydrate gypsum, which can form a mortar hardened body having excellent dimensional stability in water.SOLUTION: There is provided a cement composition comprising a hydraulic component composed of Portland cement and hemihydrate gypsum and a fine aggregate. The total amount of soluble silica and soluble alumina, measured in accordance with JIS A 1145:2017 [Method of test for alkali-silica reactivity of aggregates by chemical method], is less than 50 mmol / L per 25 g of a fine aggregate. The content of the fine aggregate is 30 to 80 mass% based on the total amount of the cement composition. The content of the Portland cement is 20 to 60 mass% and the content of the hemihydrate gypsum is 40 to 80 mass%, based on the total amount of the hydraulic component.SELECTED DRAWING: None

A process for the production of alpha-calcium sulphate hemihydrate, the process comprising the steps of: providing an input comprising particulate gypsum and an impurity; providing water; mixing the input and the water to form a gypsum slurry; maintaining the gypsum slurry under raised pressure and temperature to convert the particulate gypsum into alpha-calcium sulphate hemihydrate; and providing an alpha-calcium sulphate hemihydrate slurry; in order to provide an output comprising alpha-calcium sulphate hemihydrate with a reduction in the amount or activity of an impurity compared to the input or wherein the output comprises the impurity in a changed form compared to the input.

The invention discloses a preparation method of low-alkali plant-growing concrete with full-dosage phosphogypsum and recycled aggregate, and belongs to the technical field of resource utilization of industrial solid waste and building solid waste and ecological building materials. The low-alkali plant-growing concrete containing the full-dosage phosphogypsum and the recycled aggregate is prepared from the following raw materials in parts by weight: 180 to 190 parts of semi-hydrated phosphogypsum, 1365 to 1375 parts of the recycled aggregate, 55 to 65 parts of cement, 17 to 22 parts of fly ash, 0.4 to 0.6 part of a water-retaining agent, 32 parts of electrolytic manganese residues and 0.8 to 1.2 parts of a water reducing agent. The low-alkali plant-growing concrete prepared by the invention realizes full utilization of solid wastes, construction of a low-alkali environment and cooperation of a suitable pore structure and plant nutrition supply, and the comprehensive performance meets ecological engineering requirements.

The application discloses a kind of composite gel-physical foaming synergistic carbon dioxide foam concrete preparation process, carbon dioxide foam concrete, by mass parts, consisting of following components: sulphate cement 15-45 parts, hemihydrate gypsum 10-50 parts, Portland cement 5-15 parts, mineral powder 0-30 parts, gypsum retarder 0-0.3 parts, retarder 0.2-0.4 parts, water reducing agent 0.2-0.4 parts, calcium stearate 0.2-0.6 parts, hydroxypropyl methylcellulose ether (HPMC) 0.1-0.3 parts, water-cement ratio 0.2-0.45, prefabricated foam 5-15 parts.Sulphate cement, Portland cement and hemihydrate gypsum are mixed to prepare carbon dioxide foam concrete when specific mass ratio, can play the hydration synergistic effect between three, and then can greatly improve the mechanical properties of carbon dioxide foam concrete.

The invention relates to the technical field of civil engineering materials, in particular to a cement-based composite coiled material for emergency rescue and a rapid construction method.The cement-based composite coiled material for emergency rescue comprises a stereoscopic three-dimensional structure fabric and hydraulic cement-based filler, the stereoscopic three-dimensional structure fabric is filled with the hydraulic cement-based filler, and the hydraulic cement-based filler is arranged in the stereoscopic three-dimensional structure fabric. One side of the bottom of the three-dimensional structure fabric further comprises a waterproof wear-resistant coating; the hydraulic cement-based filler is prepared from the following components in parts by weight: 30 to 45 parts of high belite sulphoaluminate cement, 10 to 20 parts of ordinary Portland cement, 10 to 15 parts of fly ash, 5 to 8 parts of alpha-semi-hydrated gypsum, 3 to 5 parts of an expanding agent, 0.5 to 1.5 parts of a polycarboxylic acid type water reducing agent, 25 to 35 parts of silica sand and 0.1 to 0.8 part of a thickening time control agent. The prepared cement-based composite coiled material for emergency rescue has good tensile property, and the prepared cement-based composite coiled material meets the one-day compressive strength gt; the 28-day compressive strength is gt; the pressure is 65 MPa; the one-day tensile strength is gt; 3.5 MPa, 28-day tensile strength gt; and the performance index requirement of 5.5 MPa is met.

A crystalline aceclodine HCl hemihydrate of formula (I): having a DSC onset peak at a value between 137.08 DEG C and 139.08 DEG C and / or an X-ray powder diffraction pattern with a characteristic peak at 17.7 + / -0.2 and / or 20.47 + / -0.2, represented by a 2-theta value (2 theta).

The present invention belongs to the field of pharmaceutical synthesis technology, and in particular to a new crystal form of fosfomycin sodium and its preparation method and application. The X-ray powder diffraction pattern of the new crystal form of fosfomycin sodium has characteristic peaks at the following 2θ angle positions: 6.59 ± 0.2°, 6.90 ± 0.2°, 15.88 ± 0.2°, 18.43 ± 0.2°, 18.72 ± 0.2°, 20.94 ± 0.2° and 30.65 ± 0.2°. Its preparation method includes: fosfomycin left phosphorus right amine salt is dissolved in sodium hydroxide aqueous solution, liquid separation, water layer is added to alcohol solvent and stirred for crystallization, filter cake is washed after filtration, filter cake is passed through saturated water nitrogen and purged to the filter cake surface to appear molten state, vacuum drying, obtains fosfomycin sodium new crystal form. Fosfomycin sodium provided by the present invention is a hemihydrate crystal form, and its hygroscopicity is low, which is more conducive to subpackaging and mixing in production.

This invention belongs to the technical field of medicinal chemistry, specifically relating to a novel crystal form of cariprazine, specifically the cariprazine-4-hydroxybenzoic acid-methanol-hemihydrate crystal form and its preparation method. The novel cariprazine-fumaric acid crystal form provided by this invention comprises a basic unit of one molecule of cariprazine, one molecule of 4-hydroxybenzoic acid, one molecule of methanol, and 0.5 molecules of water. Its preparation method is simple to operate, the crystallization process is easy to control, and it has good reproducibility. The formation of a eutectic significantly enhances the solubility of cariprazine, exhibiting strong pharmaceutical value.

The invention discloses an efficient retarding and strength-retaining composite retarding formula and application of the efficient retarding and strength-retaining composite retarding formula in alpha-semi-hydrated gypsum, and the composite retarding formula is prepared from the following raw materials in parts by weight: 0.01 to 0.06 part of sodium tripolyphosphate, 0.02 to 0.08 part of a retarding auxiliary agent and 0.01 to 0.04 part of a reinforcing agent; the retarding auxiliary agent is a composition of protein substances and carbohydrates. The composite retarding formula developed by the invention has a synergistic effect, aims to realize efficient retarding under a low mixing amount, meanwhile, the used raw materials are low in price and easy to obtain, the operation is simple and convenient, and the composite retarding formula shows a wide prospect for high-valued application of alpha-HH.

To provide a cement composition comprising Portland cement and hemihydrate gypsum, which can form a mortar hardened body having excellent dimensional stability in water and has excellent rapid hardening properties.SOLUTION: There is provided a cement composition comprising a hydraulic component composed of Portland cement and hemihydrate gypsum, a limestone fine aggregate, a carbonate, a water-reducing agent, a thickening agent and a defoaming agent. Based on the total amount of the hydraulic component, the content of the Portland cement is 20 to 60 mass% and the content of the hemihydrate gypsum is 40 to 80 mass%. The content of the limestone fine aggregate is 50 to 250 pts.mass and the content of the carbonate is 0.30 to 1.8 pts.mass, the content of the water-reducing agent is 0.03 to 6.0 pts.mass, the content of the thickening agent is 0.03 to 4.0 and the content of the defoaming agent is 0.03 to 4.0 pts.mass, based on 100 pts.mass of the hydraulic component.SELECTED DRAWING: None

The application provides a method for testing gypsum moisture content based on nuclear magnetic resonance, comprising the following steps: performing nuclear magnetic resonance test on a gypsum sample to be tested to obtain a nuclear magnetic resonance signal amplitude; the magnetic field strength of the nuclear magnetic resonance test is less than or equal to 1T; obtaining the mass of water in the gypsum sample according to a predetermined standard curve and the signal amplitude; obtaining the gypsum moisture content according to the mass of water in the gypsum sample and the mass of the gypsum sample to be tested; and the predetermined standard curve is a linear relationship curve of the mass of water in the gypsum and the signal amplitude. The application adopts a low-field nuclear magnetic resonance method (magnetic field strength less than or equal to 1T) to non-destructively determine the water content in the gypsum, thereby determining the type of the gypsum (anhydrite, hemihydrate gypsum and dihydrate gypsum). The method provided by the application does not need to dry the gypsum sample to be tested, has the advantages of rapidness and non-destructiveness, and has a wide application prospect in the determination of water content in the gypsum field and the determination of different types of gypsum.

The invention discloses a building exterior wall freeze-thaw crack repairing material, a building exterior wall material and a preparation method thereof, relates to the technical field of building materials, and solves the problem that freeze-thaw cracks are easy to appear in the existing building exterior wall in severe cold areas. The repairing material is prepared from butyl acrylate, glycidyl methacrylate, ethyl p-methoxycinnamate, PEG (Polyethylene Glycol)-S-S-PEG (Polyethylene Glycol), N-TiO2 (at) PANI (Polyaniline) composite particles, bacillus pasteurii microcapsules, nutritive salt microcapsules and a photoinitiator HMPP (Hydroxymethyl Propionic Acid). The building exterior wall material further comprises quartz sand, shale ceramsite, P.O 42.5 cement, beta-semi-hydrated gypsum powder, a polycarboxylic acid type water reducing agent, hydroxypropyl methyl cellulose, ethylene glycol, an organic silicon type defoaming agent, nano calcium carbonate and chopped cellulose fibers. The overall maintenance cost can be reduced, the structural safety is improved, and the requirements of northern buildings are met.

The application discloses a kind of phosphoric acid extraction semi-water-two water alternate crystallization system and method, belong to the technical field of wet-process phosphoric acid production, the system is by the reaction tank unit of series connection and semi-water and two water reaction tank alternate arrangement, with the sulfuric acid dilution mixed heat exchanger group connected with reaction tank, simple heat exchanger group is arranged between tank to realize heat transfer.Construction.The method includes: material is temperature-adjusted after passing through sulfuric acid dilution mixed heat exchanger, in turn into the reaction tank sequence of alternate arrangement, heat circulation is carried out in adjacent tank by simple heat exchanger, under the control of PLC in 75~85 DEG C and 88~95 DEG C interval, realize the alternate crystallization of semi-water-two water calcium sulfate.The application replaces traditional flash evaporation external discharge with heat internal circulation between tank, solves the technical problems of high steam energy consumption, low phosphorus recovery rate, insufficient phosphoric acid concentration and high upgrading cost of stock device in traditional process, and has the comprehensive advantages of energy saving, yield, low-cost transformation and phosphogypsum resource.

The invention discloses a self-leveling gypsum base plate. The self-leveling gypsum base plate comprises a base layer and a self-leveling layer, the base layer is prepared from 100 parts of building gypsum, 0.2 to 0.4 part of composite retarder, 0.3 to 0.7 part of high-performance polycarboxylic acid water reducing agent, 6 to 12 parts of mixed fiber and 15 to 25 parts of functional filler; the self-leveling layer is arranged on the upper surface of the base layer and comprises the following components in parts by weight: 80-120 parts of semi-hydrated gypsum, 2-6 parts of redispersible latex powder, 0.1-0.5 part of cellulose ether, 0.05-0.2 part of a defoaming agent, 0-5 parts of pigment and 30-60 parts of water. Meanwhile, the invention discloses production equipment of the gypsum base plate. The self-leveling gypsum base plate disclosed by the invention has good flatness, high strength and good durability; meanwhile, the production equipment can realize automatic production, improve the production efficiency, reduce the energy consumption, accurately control various parameters in the production process, and ensure the stability and consistency of the product quality.

A method for producing phosphoric acid, comprising attack in an aqueous medium of phosphated rock with sulfuric acid, with formation of a first dihydrate slurry suspended in an aqueous phase having a free P2O5 content between 38 and 50% and a free SO3 content of less than 0.5%, conversion of this first slurry by heating with recrystallization of the solubilized calcium sulfate giving rise to a second hemihydrate slurry, and separation in the second slurry between a production phosphoric acid and a hemihydfate cake, characterized in that it comprises'during the attack, addition of a fluorine source in the first slurry in a content from 1 % to 5% by weight of F relatively to the P2O5 contained in the phosphated rock.

The invention provides a mesoporous gypsum block and a preparation method thereof, and relates to the technical field of building materials and novel wall materials, the mesoporous gypsum block is prepared from the following raw materials by weight: 35-65 parts of hemihydrate gypsum, 40-60 parts of anhydrous II gypsum, 1.5-2.5 parts of nano mesoporous silica or modified nano mesoporous silica, 0.1-0.15 part of a polycarboxylic acid water reducer, 2-5 parts of a fiber reinforced material, and 90-150 parts of water. According to the invention, nano mesoporous silica is selected as a hard template agent and is compounded with two kinds of biphase gypsum, i.e., semi-hydrated gypsum and anhydrous II gypsum, so that the mesoporous gypsum block is generated, and the mesoporous gypsum block has a relatively strong pore skeleton structure and relatively good thermal stability, and has more excellent heat insulation performance compared with a traditional heat insulation material; energy is saved, consumption is reduced, space is saved, auxiliary materials are saved, and the service life is long.

An underlayment material composition is disclosed that includes a binder, a filler, a polymer, and a retarder. The binder includes calcium sulphate alpha hemihydrate, the filler includes cork, the polymer includes superplasticizer, and the retarder includes modified amino acid. The underlayment material exhibits a thermal resistance value that exceeds a threshold value for a defined thickness value. Further, a method of using the underlayment material composition in non-structural applications of one or more construction-related activities includes mixing the underlayment material composition, that includes the binder, the filler, the polymer, and the retarder, with a defined amount of water for a defined amount of time to produce an underlayment material composition mix having a defined consistency. The method further includes applying a coat of the underlayment material composition mix on a primer-coated surface.

According to a first aspect, the invention relates to a process for the production, preferably continuous, of calcium sulfate alpha hemihydrate, the process comprising: - the preparation of an aqueous gypsum suspension comprising gypsum in particulate form, water and at least one superplasticizing polymer selected from phosphate polyethers, sulfonated melamine formaldehyde (SMF) and sodium poly(styrene sulfonate); - the calcination of the aqueous gypsum suspension at a suitable temperature and pressure to obtain a suspension of calcium sulfate alpha hemihydrate; - optionally, the filtration of the calcium sulfate alpha hemihydrate suspension to separately obtain a concentrated alpha hemihydrate suspension and an aqueous filtrate.The invention also relates, according to a second aspect, to a process for preparing a gypsum-based product comprising the preparation of a plaster suspension comprising calcium sulfate alpha hemihydrate obtained by the process according to the invention. Furthermore, the invention relates to a plaster-based product obtained using a process according to the invention. The invention also relates to a gypsum-based product obtained using a process according to the invention, such as a plasterboard. Figure 2.

The application discloses a kind of phosphogypsum solid waste's step-by-step modification calcination preparation method, belong to solid waste treatment technical field.The method includes: (1) pre-coating treatment: the original state of containing attached water dihydrate phosphogypsum is mixed with composite modifier and is ground, and pre-coated phosphogypsum is obtained;(2) temperature control calcination: the pre-coated phosphogypsum obtained in step (1) is sent into calcining kiln, and dehydration reaction is carried out at 165 DEG C~180 DEG C temperature, and hemihydrate gypsum powder is obtained;(3) hygroscopic aging: the hemihydrate gypsum powder obtained in step (2) is cooled and aged 24h~48h, and the components in powder are used to absorb moisture in air to carry out hydration reaction, and the final product is obtained.The method is free of water washing, short process, and the obtained phosphorus building gypsum standard consistency water consumption is 45%~50%, and 2 hour compressive strength is greater than or equal to 6.5MPa.

This invention discloses a method for purifying and classifying low-quality, compacted phosphogypsum to prepare building materials, comprising the following steps: 1) feeding low-quality, compacted phosphogypsum into a ceramic ball mill for grinding to obtain phosphogypsum slurry; 2) feeding the phosphogypsum slurry into an ultrasonic cleaner for ultrasonic vibration cleaning; 3) obtaining a foam product as high-silica tailings and an underflow product as high-purity phosphogypsum slurry; 4) feeding the high-silica tailings into a filter for filtration, and then adding fly ash and an alkali activator to the filtered high-silica tailings to obtain a phosphogypsum-based polymer; 5) filtering the high-purity phosphogypsum slurry through a filter, drying it in an oven, and finally calcining it in a calcining furnace to obtain high-quality β-hemihydrate gypsum powder. This invention is simple and feasible, and particularly effective in purifying low-quality phosphogypsum with many impurities and severe compaction, without generating secondary solid waste. It also provides a reasonable and reliable full-scale application technology route for the resource utilization of low-quality, compacted phosphogypsum.

The invention relates to the field of gypsum-based building materials, and particularly discloses a preparation method of a lysine-tannic acid compound retarder and a gypsum-based building material.The preparation method comprises the following steps that 1, tannic acid and copper acetate are added into water to be stirred, and a copper-tannic acid pre-coordination solution is obtained; then adding L-lysine into the mixture, and stirring for reaction to obtain precursor liquid after the reaction is completed; and (2) adding glyoxal into the precursor liquid for reaction, and then adding dialdehyde polyethylene glycol for continuous reaction to obtain the compound retarder. The gypsum-based building material comprises the following components: alpha-semi-hydrated gypsum, cement, slag powder, the lysine-tannic acid compound retarder, a water reducing agent and mixing water. The retarder provided by the invention not only has a good retarding effect on the gypsum-based building material, but also can improve the early strength of the gypsum-based building material, and effectively overcomes the contradictory problem of retarding and early strength.

The application discloses a kind of thermal insulation wall repair materials and preparation method thereof.The thermal insulation wall repair material of the application includes the following components by weight parts: modified burnt magnesium oxide 125-166 parts, ammonium dihydrogen phosphate 120-165 parts, fly ash floating bead 72-105 parts, water glass 20-55 parts, steel slag powder 25-55 parts, aluminum powder 18-40 parts, alpha-hemihydrate gypsum 10-40 parts, xanthan gum 15-45 parts, water 185-286 parts.The application fuses surface modification technology, polymer enhancement technology and the like, so that the modified magnesium oxide particles have good fluidity, controllable setting time in the later hydration process, and can improve the bonding performance of the material in the later period.After fully mixing modified burnt magnesium oxide, ammonium dihydrogen phosphate, mixed mineral admixture, water glass and foaming agent, the prepared thermal insulation wall repair material has high permeability, high fluidity, high cohesiveness, operability, and prolongs the service life of the thermal insulation wall.

This invention discloses a synthetic gypsum and gypsum boards produced therefrom. Limestone (Calcium Carbonate), slaked lime (calcium hydroxide), water, and sulfuric acid are mixed, and alpha hemihydrate gypsum is optionally added as crystal seed to produce synthetic gypsum. The synthetic gypsum is then used to make gypsum boards. The gypsum board produced according to this invention contains at least 10% alpha hemihydrate gypsum.

The invention discloses high-crack-resistance fly ash-based all-solid-waste foam concrete and a preparation method thereof, and belongs to the technical field of solid waste resource utilization and building materials. The all-solid waste foam concrete is prepared from pretreated fly ash, S95-grade slag powder, semi-hydrated phosphogypsum, an organic-inorganic composite anti-cracking agent, a foaming component sodium peroxide and mixing water. The crack resistance and the mechanical property of the material are remarkably improved through the processes of synergistic activation pretreatment of the fly ash and the alkaline residues, in-situ synthesis of the organic-inorganic composite anti-cracking agent and the like. The bleeding rate of the obtained product is lower than 5%, the 28-day compressive strength is larger than 0.5 MPa, the crack area is smaller than 100 mu m < 2 >, all the raw materials are industrial solid waste, and high-value utilization of the solid waste is achieved. The composite material has the characteristics of low energy consumption, high crack resistance and environmental protection, and is suitable for building thermal insulation and filling engineering.

The application discloses a method for extracting phosphorus and reducing aluminum in a hemihydrate-dihydrate wet-process phosphoric acid process, and belongs to the technical field of the wet-process phosphoric acid. The method is characterized in that: after phosphorite and return acid are uniformly mixed, hemihydrate acidolysis reaction is carried out in the presence of concentrated sulfuric acid, a mixed slurry of stable hemihydrate calcium sulfate crystals and intermediate acid is obtained, then a hydroxyquinoline compound is added, and after continuous reaction, hemihydrate gypsum and intermediate acid with low Al2O3 content can be obtained by filtration; dihydrate gypsum can be obtained by carrying out dihydrate conversion reaction of the hemihydrate gypsum in the presence of concentrated sulfuric acid. The method couples a chemical precipitation method in the hemihydrate-dihydrate wet-process phosphoric acid acidolysis process, can reduce the Al2O3 content in the intermediate acid by the chemical precipitation method, the generated precipitate can be filtered together with the phosphogypsum, and the separation of impurities is easy to realize; meanwhile, the generated precipitate can promote crystal growth in the dihydrate conversion reaction of the hemihydrate gypsum, uniform and bulky dihydrate calcium sulfate crystals are obtained, the washing and filtering performance of the filter cake is improved, and the phosphorus yield is increased.

The present application relates to a desulfurization gypsum upgrading technology field, specifically relates to a kind of desulfurization gypsum upgrading hydrothermal synthesis sectional reactor, including sequentially connected and assembled mixed incubation device and sectional pressurized reaction device.Mixed incubation device includes the premixing reactor with steam injection mixed into material port and fast stirring mixing device.Sectional pressurized reaction device includes pressurized reactor, material rolling throwing and transport device and steam spraying device.Pressurized reactor has rotatable barrel, barrel is configured with main reaction zone and residual reaction zone;And the arrangement density of the pipe steam injection port of main reaction zone is greater than the arrangement density of the pipe steam injection port of residual reaction zone.The present application realizes the sufficient mixing reaction of gypsum slurry in pressurized reactor on the basis of reducing energy consumption, solves the problems, such as product quality fluctuation, relatively low strength, large energy consumption and low reaction efficiency in the process of traditional autoclaved process and high-pressure aqueous solution method upgrading preparation α-hemihydrate gypsum.

The application discloses a desulfurization gypsum dechlorination and quality improvement process system and belongs to the technical field of alpha hemihydrate gypsum production. In the material step-by-step drying system of the process, the material outlet of a reaction device is communicated with the material inlet of a high-pressure slurry separation and dehydration device, the material outlet of the high-pressure slurry separation and dehydration device is communicated with the material inlet of a flash device, the material outlet of the flash device is communicated with the material inlet of a high-temperature drying device, and the separation steam outlet of the flash device is communicated with the steam inlet of a solid-liquid mixing device. The separation water outlet of the high-pressure slurry separation and dehydration device is communicated with the high-pressure inlet of a multi-stage water circulation system, the separation water outlet of the flash device is communicated with the steam inlet of a raw material reaction system, and the separation water outlet of the high-temperature drying device is communicated with the low-pressure inlet of the multi-stage water circulation system. The process reduces system energy consumption through a step-by-step drying method, effectively utilizes drying water with different pressures through a multi-stage water circulation system, and reduces system heat loss through heat recovery.

This disclosure pertains to the field of phosphogypsum technology, specifically relating to a hemihydrate phosphogypsum gel material, its preparation method, and its applications. The gel material is prepared using hemihydrate phosphogypsum, an alkaline activator, and a water-reducing agent. This reduces water consumption while achieving a good retarding effect. By introducing silicate compounds and crystal form regulators with succinic acid groups and silane groups, the synergistic effect of these compounds and regulators provides a cementing network for the dihydrate phosphogypsum crystals, increasing bonding strength and thus improving the strength of gypsum products. Therefore, the hemihydrate phosphogypsum gel material provided by this disclosure maintains the mechanical properties of the gel material while reducing water consumption and extending setting time.