1998 results about "Phosphogypsum" patented technology

The invention belongs to the technical field of building materials, and discloses a high-activity composite auxiliary cementing material based on carbonated steel slag-carbide slag as well as a preparation method and application of the high-activity composite auxiliary cementing material. The high-activity composite auxiliary cementing material is prepared from the following raw materials in parts by mass: 40 to 55 parts of carbonated steel slag-carbide slag composite micro powder, 30 to 40 parts of high titanium slag, 20 to 25 parts of metakaolin, 3 to 5 parts of ardealite, 3 to 5 parts of calcium carbonate, 3 to 5 parts of calcium carbonate and 3 to 5 parts of calcium carbonate. Wherein the carbonated steel slag-carbide slag composite micro powder is obtained by carrying out carbon sequestration reaction on steel slag and carbide slag in a solution consisting of a carbonization enhancer, an additive and water. On one hand, the CO2 storage amount of the steel slag and the carbide slag is increased, the stability and the activity are improved, on the other hand, the carbonized steel slag-carbide slag and other industrial solid waste are cooperated to achieve a composite superimposed effect, the cement mortar or the concrete can be improved in strength, stability and durability, the comprehensive performance is good, and the cost is low. And the method is green, low-carbon, energy-saving, environment-friendly and wide in popularization and application

The invention provides an ardealite road base material and a preparation method thereof, and belongs to the field of road base materials. The road base material is prepared from the following raw materials in parts by weight: 850 to 900 parts of phosphogypsum, 5 to 15 parts of quick lime, 40 to 60 parts of cement, 55 to 85 parts of composite curing agent and 8.5 to 13 parts of curing exciting agent. The phosphogypsum is modified, so that soluble phosphorus and soluble fluorine in the phosphogypsum are cured; the curing exciting agent is atomized and added into the mixture of the modified phosphogypsum, the cement and the composite curing agent, so that all the components are in full contact, the hydration effect is promoted, and the strength and stability of the base material are improved. The pavement base material provided by the invention consumes a large amount of phosphogypsum, can effectively relieve the problem of accumulation of a large amount of phosphogypsum, reduces environmental pollution, has good mechanical properties, water stability and durability, is applied to highway construction, and has important environmental protection significance and social benefits.

The invention relates to a high-performance solid-waste-based offshore wind power grouting material and a preparation method thereof, and a solid-waste-based cementing material is a hydraulic cementing material prepared by processing and grinding one or more solid wastes such as water-quenched blast furnace slag, steel slag, desulfurized gypsum, fly ash, red mud, tailings, carbide slag and phosphogypsum as raw materials according to a certain proportion. The solid waste-based cementing material is adopted to replace 525 Portland cement, the prepared grouting material product is excellent in performance, the carbon emission of the grouting material product is remarkably reduced, the cost is also reduced, resource utilization of industrial solid waste is facilitated, meanwhile, the performance of the grouting material is obviously improved, and the grouting material is suitable for popularization and application. The advantages of ultrahigh strength, elasticity modulus, high flowability, low shrinkage and high durability are realized.

The invention relates to the technical field of filling materials, and particularly discloses an ardealite-based high-strength anti-seepage filling material and a preparation process thereof, the ardealite-based high-strength anti-seepage filling material comprises 50%-65% of pretreated ardealite, 15%-25% of Portland cement, 5%-15% of superfine slag powder, 5%-10% of electrolytic manganese residues, 5%-8% of silica fume, 3%-6% of metakaolin, 2%-4% of a composite alkali activator and 0.5%-1.2% of a polycarboxylic acid water reducer, 0.3%-0.8% of an organic silicon water repellent and 0.05%-0.1% of cellulose ether; according to the invention, through chemical reaction of Mn < 2 + > in the electrolytic manganese residue and SO4 < 2-> in the phosphogypsum, micron-sized manganite crystals (MnAl2 (SO4) 4. 22H2O) are generated to actively fill internal micro-cracks of the material, so that a filling body is endowed with a self-repairing function and the impermeability is improved, and a composite alkali activator composed of NaOH and water glass is used for synergistically activating potential gelling activity of the superfine slag powder and the silica fume, so that the self-repairing filling material is prepared. And the formation of hydration products is accelerated, and 0.3-0.5 T of pulsed magnetic field is applied in the stirring process, so that the manganite crystals are guided to orderly grow along the expected stress direction of the filling body, and the compressive strength is improved.

The invention provides a slag ardealite-based solid waste cementing material as well as a preparation method and application thereof, and belongs to the technical field of building materials. The slag ardealite-based solid waste cementing material is prepared from the following raw materials in percentage by mass: 45-55% of slag, 40-50% of ardealite, 0.5-5% of carbide slag and 2-10% of silica fume, the water-cement ratio is 0.35-0.50, the slag, the ardealite, the carbide slag and the silica fume are uniformly mixed, then water is added, stirring is performed to obtain slurry, and the slurry is uniformly mixed to obtain the slag ardealite-based solid waste cementing material. Pouring into a mold, standing, demolding, and carrying out standard curing to obtain the slag ardealite-based solid waste cementing material. According to the invention, two calcium-containing solid wastes of slag and ardealite are used as main raw materials, carbide slag is used as an alkaline activator, silica fume is added to further improve the performance of the solid waste cementing material, the cement has the characteristics of low carbon, low cost, high performance and the like, and environmental and ecological problems caused by accumulation of a large amount of solid waste materials are reduced at the same time.

The invention discloses low-alkali solid waste cementing material-based plant-growing concrete and a preparation method thereof. The vegetation concrete comprises a base layer framework and a surface layer material laid on the framework. Wherein the base layer framework is prepared from the following raw material components in parts by weight: 160 to 200 parts of low-alkali solid waste cement, 15 to 25 parts of phosphogypsum, 1380 to 2100 parts of mineralized concrete recycled aggregate, 62 to 102 parts of mineral admixture and 60 to 90 parts of mixing water. The surface layer material comprises the following raw material components: 1-5% of sodium alginate, 1-10% of calcium superphosphate, 1-10% of urea and the balance of soil. The mineralized concrete recycled aggregate is prepared by the following steps: soaking the concrete recycled aggregate in a diammonium hydrogen phosphate solution, and separating out the aggregate after soaking is completed, thereby obtaining the mineralized concrete recycled aggregate. According to the plant-growing concrete, alkalinity in concrete pores can be remarkably reduced, and the plant-growing concrete has stable later strength and good plant germination rate.

The invention discloses a process and system for recovering phosphorus and fluorine from ardealite leachate, which comprises the following steps: feeding the ardealite leachate into an induced crystallization reactor for induced crystallization, discharging generated large-particle fluorapatite crystals from a crystal discharge port at the bottom of the induced crystallization reactor, and collecting and recycling; aluminum hydroxide flocs and fine-particle fluorapatite crystals enter a cyclone separator along with the effluent, the fine-particle fluorapatite crystals are separated and then flow back to the induced crystallization reactor, the aluminum hydroxide flocs form precipitates in the flocculation sedimentation tank through flocculation to be removed, and the effluent of the flocculation sedimentation tank enters a multi-stage treatment system. According to the method disclosed by the invention, fluorine and phosphorus in the phosphogypsum leachate are recovered together, the recovered fluorapatite finished product is high in purity and can be recycled, and the amount of chemical sludge is also greatly reduced, so that the treatment cost of the sludge is reduced.

The present invention belongs to the field of resource utilization of building materials and solid waste, and relates to a red-mud-based cementing material based on efficient drying, component homogenization and activity improvement, and a preparation method therefor. The preparation method comprises: adding a filter aid to red mud to carry out sedimentation, then subjecting same to filter pressing until the water content is 14-16%, then drying the solid material, which has been subjected to filter pressing, until the water content is 4% or below, and finally grinding same to obtain the product. The filter aid comprises the following raw materials: 10-30 parts of polyaluminum chloride, 5-15 parts of polyaluminum sulfate, 1000-1200 parts of blast furnace slag or fly ash, 700-900 parts of steel slag, 400-600 parts of carbide slag or alkaline residues, and 300-400 parts of desulfurized gypsum or phosphogypsum or fluorgypsum. By means of the present invention, the dehydration efficiency of red mud can be improved, the red-mud-based cementing material can also be prepared in one step; the preparation process for the red-mud-based cementing material is simplified; and the prepared red-mud-based cementing material has the advantages of a high mechanical strength, high durability and erosion resistance.

The invention discloses a method for recycling iron and manganese and preparing a cementing material by synergistically utilizing electrolytic manganese residues and waste incineration fly ash and a product thereof, the method comprises the following steps: mixing ardealite and electrolytic manganese residues, and uniformly stirring to obtain gypsum manganese residues; calcining the gypsum manganese slag to obtain activated slag; mixing the activated slag material, municipal sludge and waste incineration fly ash, and uniformly stirring to obtain an initial roasting material; the initial roasting material is subjected to continuous pyrolysis carbonization, pyrolysis flue gas dust recycled in the first pyrolysis process is coarse iron powder, pyrolysis flue gas dust recycled in the second pyrolysis process is coarse manganese powder, solid residues obtained in the second pyrolysis process are gelatinized activated residues, the gelatinized activated residues are ground into powder, and the cementing material is obtained. The preparation process is simple, and the required raw materials are only electrolytic manganese residues, waste incineration fly ash and common industrial solid wastes.

The invention relates to the technical field of solid waste treatment, in particular to a phosphogypsum source harmless treatment method. Washing the tail section of the crystal growing slurry filtering system with clean water, and obtaining phosphogypsum after washing, wherein the ratio of the water consumption of the clean water to the phosphogypsum is (1: 10)-(1: 1) cubic / ton; performing size mixing on filter cloth washing water in a crystal growing slurry filtering system and the obtained ardealite to obtain ardealite slurry with the concentration of 20wt%-60wt%; adding a harmless treatment agent A into the obtained ardealite slurry, uniformly stirring and mixing, and reacting for 5-60 minutes to obtain first-stage reaction slurry; adding a harmless agent B into the obtained first-stage reaction slurry, uniformly stirring and mixing, reacting for 20-60 minutes, and filtering to obtain filtrate and harmless ardealite. The comprehensive recovery rate of fluorine and phosphorus valuable components in the wet-process phosphoric acid industry is realized through simple process improvement, and the pollutant content of the phosphogypsum after washing and filtering is reduced; according to the phosphogypsum harmless treatment method, the idea that industrial solid waste is used for treating pollution with waste is utilized, the agent preparation raw materials are wide in source and low in cost, and the agent is a toxic representative for solid waste pollution prevention and control cooperative control and assistant pollution reduction and carbon reduction synergistic interaction.

The invention relates to the technical field of building materials, and particularly discloses a lightweight high-strength waterproof gypsum board and a preparation method thereof, the lightweight high-strength waterproof gypsum board comprises alpha-type high-strength gypsum, phosphogypsum, gradient lightweight aggregate, hydrophobic fiber, temperature-sensitive waterproof capsule and the like. The preparation method comprises the following steps: preparing the hydrophobic fiber, the gradient lightweight aggregate and the temperature-sensitive waterproof capsule, dry-mixing the components, mixing the dry-mixed components with water to form slurry, and pouring and curing. Lightweight and high strength are realized through cooperation of the gradient lightweight aggregate and the hydrophobic fiber, and the temperature-sensitive waterproof capsule releases components to fill pores during curing, so that the problem of insufficient early-stage waterproof performance is solved; the prepared gypsum board has the advantages of light weight, high strength, good waterproofness and durability.

The invention discloses ardealite-based concrete and a preparation method thereof, and belongs to the technical field of building materials. The ardealite-based concrete is prepared from the following raw materials in parts by weight: 40 to 60 parts of ardealite powder, 10 to 15 parts of cement, 8 to 10.5 parts of slag powder, 5 to 7 parts of fly ash, 4 to 6 parts of desulfurized fly ash, 5 to 10 parts of natural sand, 10 to 15 parts of ardealite-based artificial aggregate, 3 to 5 parts of eggshell powder, 1.5 to 3 parts of nano silicon dioxide, 0.5 to 1.5 parts of a water reducing agent, 0.05 to 0.2 part of a retarder, 0.1 to 0.5 part of an exciting agent and 0.3 to 1 part of an antifreeze agent. According to the invention, through process innovation of multi-component collaborative design and gradient aggregate doping, the technical bottlenecks of low strength, poor durability, high environmental protection risk and the like of traditional ardealite concrete are overcome while large-scale resource utilization of ardealite is realized, and a new thought is provided for high-valued utilization of industrial solid wastes.

The invention belongs to the technical field of new building materials, and provides a low-alkalinity and early-strength ardealite filling and curing material and a preparation method thereof.The low-alkalinity and early-strength ardealite filling and curing material is prepared from ardealite, a curing agent and water, the curing agent comprises silica fume, limestone powder, superfine granulated blast furnace slag powder, metakaolin, calcium aluminate powder, Portland cement clinker powder, a suspension stabilizer and hydroxypropyl methyl cellulose ether. The problems of delayed coagulation, low early strength and high alkalinity of a common cement-based ardealite filling material can be solved, and the technical requirements of ardealite cemented filling are met.

The invention discloses a plastic hollow plate and a manufacturing method thereof, the plastic hollow plate comprises the following components by weight: 30%-60% of a polypropylene matrix and 40%-70% of phosphogypsum powder, and polypropylene provides thermoplastic formability and toughness. The preparation method specifically comprises the following steps: 1) pretreating ardealite; 2) melt blending granulation; (3) forming a hollow plate; and 4) post-processing. The ardealite hollow plate has the advantages that the ardealite filling amount is increased, meanwhile, the bending strength and impact strength of a traditional hollow plate are improved, and the performance is improved by 20% or above compared with that of a traditional hollow plate with the same filling amount; the moisture content of the pretreated phosphogypsum is less than 6%, so that bubbles in the processing process are avoided, and the interface bonding strength is improved; the comprehensive utilization rate of industrial byproduct phosphogypsum is improved, and the production cost is reduced.

The invention relates to a preparation method of a low-cost high-dosage phosphogypsum-based aggregate, and belongs to the technical field of artificial aggregate building materials. The invention aims to solve the problems of low mixing amount, high cost and low strength of the existing ardealite-based aggregate. The preparation method comprises the following steps: mixing ardealite powder, waste residue powder, namely S95 granulated blast-furnace slag powder and red mud, and inorganic cementing materials, namely PO42.5 cement and sulphoaluminate cement in proportion, granulating by a granulator, and curing to prepare ardealite-based aggregate with the particle size of 4.75-19 mm; the method is low in cost and large in phosphogypsum mixing amount, the prepared aggregate is high in strength, when the aggregate is used in concrete, consumption of natural aggregate and the concrete preparation cost are remarkably reduced, the environmental problem caused by accumulation of a large amount of phosphogypsum is effectively solved, and the method has important significance on environmental protection and economic development; the process flow is simple, industrial production is easy, a new thought is provided for high-value utilization of ardealite resources, and the method has a profound influence on promotion of circular economy and sustainable development.

The invention discloses high-performance fluid-state solidified soil for backfill based on composite ardealite of building residue soil, which is prepared by taking the building residue soil as a core raw material, taking a compound of a polycarboxylic acid water reducer and hydroxypropyl methyl cellulose as a fluidization regulator, and mixing the fluidization regulator and the building residue soil to prepare the high-performance fluid-state solidified soil for backfill. Superfine slag powder, fly ash, nano silicon dioxide, metakaolin and ardealite are used as curing agents, so that the fluid-state solidified soil with strong performance is obtained. Through the synergistic effect of all the components and innovative processes such as liquid nitrogen low-temperature grinding, nano material compounding and a segmented vacuum stirring process, the effect that the ultrahigh strength of the construction waste soil reaches 7.5 MPa within 14 days is achieved for the first time and is improved by 40% or above compared with that of conventional solidified soil, and the industrial problem that traditional waste soil is insufficient in solidification strength is solved; and collaborative optimization of strength and fluidity is realized. Meanwhile, efficient resource utilization of the construction waste is achieved, land occupation and environmental pollution caused by muck landfill are greatly reduced, and the requirement for green and sustainable development is met.

The invention discloses a road cementing material based on bulk solid wastes and a preparation method thereof, and belongs to the field of geopolymer cementing materials. The material is prepared from 35-38 parts of fly ash, 15-18 parts of acid-washed red mud, 22-25 parts of carbide slag, 20-23 parts of phosphogypsum, 5-8 parts of rice hull ash, 6-9 parts of a water reducing agent and water, and the water-binder ratio is (0.4-0.5): 1. Wherein the pickling red mud is treated by 5-6% dilute sulphuric acid (pH is 8-9, and heavy metal is reduced by 30%), and the rice hull ash (SiO2 is greater than or equal to 85%) and the nano silicon dioxide (10-30nm) synergistically optimize the microstructure. The 28-day compressive strength of the material is larger than or equal to 35 MPa, the load cycle strength loss rate is smaller than or equal to 5%, the CO2 emission amount is 62 kg / t, the heavy metal leaching concentration is lower than the national standard by 50%, and the cost is only 31.6% of that of traditional cement. According to the invention, efficient synergistic utilization of four solid wastes of fly ash, red mud, carbide slag and ardealite is realized, and the concrete has the characteristics of high strength, low pollution, salt corrosion resistance and the like, is suitable for heavy-duty road base and severe cold area engineering, and has remarkable environmental protection and economic values.

The invention discloses a method for regulating the length-diameter ratio of calcium sulfate hemihydrate whiskers prepared from ardealite, and belongs to the field of ardealite resource utilization. According to the invention, carbohydrates, alcohols and other substances containing hydroxyl groups are used as the crystal modifier, and the calcium sulfate hemihydrate whisker is prepared by regulating and controlling phosphogypsum through a normal-pressure hydrothermal method, so that the length-diameter ratio of the whisker is regulated and controlled within a certain range. The method solves the problems that the length-diameter ratio of the whisker in the calcium sulfate hemihydrate whisker product prepared from ardealite is not uniform and cannot be regulated and controlled, the preparation process is tedious, the corrosivity is strong due to excessive salt solution in the reaction system, and the waste liquid has great harm to the environment, and has a good application prospect.

The invention relates to the technical field of building materials, and particularly discloses a slag and ardealite synergetic activated gypsum batten and a preparation method thereof.The slag and ardealite synergetic activated gypsum batten comprises pretreated ardealite, superfine slag powder, a composite exciting agent, reinforced fibers, self-repairing microcapsules, a foaming agent and water, and the composite exciting agent is formed by compounding nano SiO2, CaO and metakaolin; the preparation method comprises the following steps: mixing nano silica sol and a lignin solution, performing spray drying, and performing heat treatment to obtain the self-repairing microcapsule; the preparation method comprises the following steps: carrying out dry mixing on pretreated phosphogypsum, superfine slag powder and a composite exciting agent, adding water, adding reinforced fibers, self-repairing microcapsules and a foaming agent, stirring to form slurry, carrying out injection molding on the slurry, and carrying out stepped maintenance of pre-maintenance, main maintenance and carbonization treatment to prepare the modified red mud-pretreated phosphogypsum-based self-repairing self-repairing composite phosphogypsum-based self-repairing self-repairing composite phosphogypsum-based self-repairing composite phosphogypsum-based self-repairing composite phosphogypsum-based self-repairing composite phosphogypsum. The composite excitant synergistically activates the activity of the slag, and is matched with the reinforced fibers, the self-repairing microcapsules and stepped curing, so that solid waste resource utilization is realized, the compression resistance, bending resistance and impact resistance of the batten are improved, and the environment-friendly and high-performance effects are achieved.

The invention provides a self-compacting ardealite road base material and a preparation method thereof, and belongs to the technical field of building materials, the base material comprises the following components in percentage by mass: 40-55% of ardealite, 4-13% of a cementing material, 35-50% of aggregate, 0.2-0.7% of an additive and the balance of water, wherein the cementing material comprises cement and slag powder, and the water-cement ratio is 4.5-7.5. According to the self-compacting phosphogypsum road base material, the properties of phosphogypsum and a cementing material are fully exerted, the filling slump expansion index of the formed self-compacting phosphogypsum road base material reaches SF1 level (550-655 mm), the expansion time T500 index reaches VS1 level (larger than or equal to 2 s), the 28-day compressive strength is larger than or equal to 8 MPa, the water softening coefficient is larger than or equal to 85%, and the water absorption rate is smaller than or equal to 10%. According to the phosphogypsum road base material disclosed by the invention, cement with a relatively low mixing amount is used, so that early-stage diseases of a road base are effectively overcome or avoided; and meanwhile, the ardealite with medium and high doping amount is used, so that the ardealite can be quickly consumed, the inventory is reduced, the stacking problem is relieved, and remarkable environmental, economic and social benefits are achieved.

The invention provides an all-solid waste geopolymer grouting material and a preparation method thereof, and relates to the technical field of solid waste resource utilization and geopolymer grouting material preparation. The all-solid waste geopolymer grouting material comprises the following raw materials in parts by weight: 100-200 parts of an all-solid waste mixture, 40-50 parts of an alkaline activator, 0.1-0.5 part of an early strength agent, 0.5-1 part of a water reducing agent, 3-7 parts of a modifier and 70-90 parts of water, the all-solid waste material comprises slag powder, steel slag powder, phosphogypsum and fly ash; the modifying agent is prepared from aluminum dihydrogen phosphate, vinyl triacetoxysilane and ethylenediamine terminated polyethyleneimine. The all-solid waste geopolymer grouting material provided by the invention has the characteristics of good working performance, high early strength, micro-expansibility and the like.

The invention relates to the technical field of coating compositions, and particularly discloses an ardealite-based heat-insulation fireproof coating and a preparation method thereof.The ardealite-based heat-insulation fireproof coating is prepared from titanium dioxide modified ardealite, hollow glass beads, styrene-acrylic emulsion, modified composite flame-retardant fibers, calcium sulfate whiskers, microencapsulated red phosphorus, redispersible latex powder, deionized water, a dispersing agent and a defoaming agent; the preparation method comprises the following steps: firstly, preparing titanium dioxide modified phosphogypsum, secondly, modifying the composite flame-retardant fiber, and finally, mixing and stirring all the components. Through the synergistic effect of the titanium dioxide modified phosphogypsum and the composite flame-retardant fiber and in combination with an ultrasonic-assisted preparation process, a double heat-insulating barrier and a synergistic flame-retardant mechanism is formed; and calcium sulfate whiskers are matched for toughening, so that the fireproof heat-insulating performance and the structural stability of the coating are improved, and the problem that the coating is easy to crack is solved.

The utility model discloses an ardealite water flotation device, which relates to the technical field of ardealite preparation, and comprises a device body, the bottom of the device body is provided with a discharge pipe and an anti-blocking assembly, the anti-blocking assembly comprises a support plate, a motor, a transmission shaft, a rotating shaft, a connecting ball, a spring, a knocking ball, a transmission wheel and a transmission belt, and the outer wall of the discharge pipe is provided with the support plate. A motor is installed on the supporting plate, a transmission shaft is installed on the motor, a transmission shaft is arranged on the supporting plate, transmission wheels are installed on the transmission shaft and a rotating shaft, a transmission belt and a cleaning assembly are movably installed on the transmission wheels, the cleaning assembly comprises a cleaning liquid box, a pump body, a guide pipe and a sealing valve, the cleaning liquid box is installed on the supporting plate, and the pump body is installed at the bottom of the cleaning liquid box; the pump body is provided with the guide pipe, the other end of the guide pipe is installed on the discharging pipe, the discharging pipe is provided with the sealing valve, and the anti-blocking assembly and the cleaning assembly are arranged, so that the discharging pipe can be prevented from being blocked, and the inner wall of the discharging pipe can be cleaned.

The invention provides a concrete composite expanding agent and a preparation method thereof, and belongs to the field of concrete admixtures. The concrete composite expanding agent comprises modified phosphogypsum, fly ash, bauxite, a modified oxide and an auxiliary agent, and is obtained by uniformly mixing the modified phosphogypsum, the fly ash, the bauxite, the modified oxide and the auxiliary agent which have different specific surface areas. According to the composite expanding agent, the modified ardealite and the fly ash synergistically provide an early-stage expansion source, early-stage shrinkage of concrete is compensated through calcium sulphoaluminate hydration products, meanwhile, modified magnesium oxide serves as a later-stage expansion source, magnesium hydroxide is generated through slow hydration, and long-term expansion compensation is achieved; the device has the advantages of good strength, compensation capability and the like; a large amount of industrial waste residues such as ardealite and fly ash are utilized, high-added-value utilization of the industrial waste residues is achieved, and remarkable economic benefits are achieved.

The invention belongs to the technical field of concrete preparation, and particularly relates to a preparation method of a large-mixing-amount concrete composite admixture with solid waste residues as raw materials. The large-dosage concrete composite admixture provided by the invention comprises the following raw materials: phosphogypsum subjected to activation and modification treatment, lithium slag powder subjected to calcination and fine grinding treatment, silica fume, redispersible latex powder, quartz powder and sodium silicate, and the raw materials are added into concrete to serve as cement replacement components. And the compressive strength, static elastic modulus, impermeability, freezing resistance and other properties of the concrete are not influenced.

The invention belongs to the technical field of wastewater adsorption and purification, and particularly relates to a water-washing phosphogypsum wastewater purification treatment system which comprises a pretreatment module, an adsorption and purification module and a detection module, the pretreatment module performs preliminary filtration treatment on wastewater, the adsorption and purification module performs adsorption and purification treatment on the pretreated wastewater, and the detection module performs detection on the wastewater. The detection module is used for detecting the treated wastewater and judging whether the treated wastewater reaches a discharge standard or not; large water pressure is formed at the position of the liquid inlet pipe at the bottom through wastewater liquid level difference, and water flow formed through instant conduction impacts a purification cavity in the purification layer, so that adsorption materials which adsorb impurities and have the tendency of mutual adhesion and clustering are dissociated and dispersed under the action of the purification water flow which is violently impacted; the purification layer with unsmooth circulation is effectively self-cleaned, so that the smooth flow of the wastewater is ensured, the frequency of manual cleaning is reduced, and the purification efficiency of the phosphogypsum washing wastewater is improved.

The invention provides a phosphogypsum lightweight aggregate and a preparation method thereof. The phosphogypsum lightweight aggregate disclosed by the invention can be applied to mass concrete engineering, the utilization rate of sandstone is effectively reduced, and the ecological environment is protected. Meanwhile, the cylinder compressive strength of the prepared lightweight aggregate can reach 10 MPa or above, the apparent density is 1600-1920 kg / m < 3 >, the water absorption rate is 9-14%, when the lightweight aggregate acts in concrete, ultra-high performance concrete with the strength grade reaching 100 MPa or above can be prepared, and the hydration shrinkage condition of the concrete can be reduced while certain strength is kept. The method applied to engineering construction not only helps to solve the national problems of high consumption and utilization of ardealite and pollution prevention, but also can solve the shortage of materials required by infrastructure construction. Compared with common concrete, the concrete has higher market competitiveness.

The invention discloses a preparation method of a prefabricated autoclaved aerated concrete slab made of a solid-waste-based sulfur-aluminum-iron binding material. The preparation method comprises the following steps: preparing dry substances of the material; carrying out solid waste pretreatment by a mechanical ball milling method; adding ardealite, aluminum ash, coal gangue, fly ash, steel slag and carbide slag at the moment; calcining and directionally mineralizing after pretreatment; secondarily grinding the intermediate material; adding the secondarily ground intermediate material, cement, aluminum powder and water, and foaming; after the slurry is thickened, multi-frequency vibration is carried out in the pouring process; after pouring is completed, multi-temperature curing is conducted; after curing is completed, the highly-doped solid waste-based functional prefabricated autoclaved aerated concrete slab product is obtained. According to the autoclaved aerated concrete slab, dependence on natural resources is effectively reduced, meanwhile, carbon dioxide emission in the production process is reduced, and meanwhile, the compressive strength and the breaking strength of the autoclaved aerated concrete slab are improved; the service life of the material is prolonged; the preparation process is simplified, and the production difficulty and cost are reduced.

The invention discloses a preparation process of a waste concrete recycled aggregate gypsum-based wall material, which comprises the following steps: (1) mixing a water repellent agent with an anhydrous solvent to obtain a pretreating agent, and then adding concrete recycled aggregate for standing; and separating out the recycled aggregate and drying the recycled aggregate to obtain the pretreated recycled aggregate. (2) calcining the magnesium oxide whisker, and then adding the obtained calcined whisker into an ethanol solution of polyethylene glycol to form a suspension; and spraying the suspension on the continuously stirred pretreated recycled aggregate, and then carrying out heating and stirring treatment to obtain the modified recycled aggregate. And (3) uniformly stirring ardealite powder, silica fume, potassium hydroxide powder and fine aggregate, then adding water, a retarder and a water reducing agent, uniformly stirring, then adding the modified recycled aggregate, and uniformly stirring, thereby obtaining the product. The process provided by the invention not only reduces the adverse effect of the recycled aggregate on the gypsum-based material, but also improves the water resistance of the gypsum-based material and enhances the mechanical strength.

The invention discloses a phosphogypsum mixing plant which comprises a powder batching machine, an aggregate batching machine, a curing agent metering device, a conveying device, a mixing main machine and a finished product warehouse, the powder batching machine, the aggregate batching machine and the curing agent metering device feed materials into the first conveying device according to the mixing proportion, and accurate metering and stable conveying of all the materials can be achieved; the raw materials are conveyed into the mixing main machine to be continuously vibrated and mixed, then the finished materials are transferred into the finished product bin through the second conveying device, and in the process, the segregation of the finished products can be greatly reduced through the arranged anti-segregation mechanism. And the production efficiency is greatly improved through continuous stirring of the stirring main machine.