223 results about "Phosphogypsum" patented technology

The present application belongs to the technical field of solid waste resource utilization, and relates to a kind of microbial mineralization solid waste based three-level interpenetrating heat storage body and its preparation method.The heat storage body includes microporous silica skeleton, and the solid waste activation component loaded in its interior;The solid waste activation component includes three-level functional material and red mud matrix;With the total mass of solid waste activation component being 100%, red mud matrix accounts for 30%-50%, and three-level functional material accounts for 50%-70%;With the total mass of three-level functional material being 100%, three-level functional material includes: 50%-60% titanium dioxide quantum dots, 20%-30% gallium oxide exciton, 10%-20% activated phosphogypsum sulfate powder;Three-level functional material forms three-level interpenetrating network structure in microporous silica skeleton.In the prior art, there is a problem in the solid waste treatment method that cannot realize the application of solid waste reenergy storage field through quantum dot and exciton coupling mechanism in solid waste.

This invention discloses a solid waste cemented board sound barrier and its preparation method. The solid waste cemented board sound barrier material is prepared from industrial solid wastes such as phosphogypsum, steel slag powder, and fly ash as the main raw materials, realizing the resource utilization of solid waste, significantly reducing raw material costs, and being environmentally friendly and low-carbon. The board production process has low energy consumption, simple and controllable technology, and is easy to mechanize for continuous production. The resulting material has high strength and stable performance, and is lightweight, fireproof, and corrosion-resistant. It does not crack or discolor under extreme climates, and its key indicators meet the requirements of highway sound barrier specifications. Based on its excellent strength, the solid waste cemented board sound barrier board prepared by this invention can be made into 4-5 meter long boards, suitable for installation with H-shaped steel columns spaced 4-5 meters apart. Compared with the traditional 2-meter boards, it can reduce the amount of column and foundation engineering, significantly reduce the overall cost, and has significant economic benefits and broad application prospects.

This invention relates to a high-efficiency sulfur recovery system and method for phosphogypsum based on microwave-plasma synergy, belonging to the field of industrial solid waste resource utilization and clean energy technology. The system includes a microwave-plasma coupled reactor, an ionic liquid absorption-pulse electrolysis module, a CO₂ mineralization unit, and an intelligent control center. Through the synergistic effect of 2.45GHz microwaves and Ar / H₂ plasma (H₂ volume fraction 8%), sulfur is efficiently released from phosphogypsum at approximately 750℃. After SO₂ is absorbed by the [BMIM][HSO₄] ionic liquid, high-purity sulfur (purity ≥99.4%) is generated through 100Hz pulse electrolysis. The byproduct CaO reacts with CO₂ to form CaCO₃. This system can achieve efficient sulfur recovery and byproduct resource utilization, featuring low energy consumption and good environmental compatibility, and is suitable for solid waste treatment and sulfur resource recycling.

The application discloses a method for rapidly and harmlessly treating phosphogypsum, and particularly relates to the harmless treatment technical field of industrial solid waste. The method comprises the following steps: mixing raw materials with an alkaline neutralizing agent, a trapping agent and an activating agent, adding a phosphorus solidifying agent and a fluorine solidifying agent, mixing, carbonizing and aging, and obtaining harmless phosphogypsum. The method adopts the alkaline neutralizing agent to rapidly neutralize free acid and improve the pH of the system; the trapping agent adsorbs heavy metals; the activating agent promotes As, Cd and the like to form a difficult-to-dissolve iron oxide gel or a precipitate; the phosphorus solidifying agent and the fluorine solidifying agent perform deep chemical precipitation to form a stable iron-calcium-phosphate / ferric fluoride composite solidified body. The functions of the agents are clear, and the agents have synergistic effects; the solidification effect of the agents on high water-solubility phosphorus, fluorine and various heavy metals is far better than that of a single or simply compounded agent system; and the leaching concentration can be reduced to a level far lower than the national standard.

This invention belongs to the field of acidic wastewater treatment technology, specifically disclosing a purification device for acidic wastewater using phosphogypsum filtration. The device includes a sedimentation tank with a baffle plate inside, a reinforcing frame fixedly connected to the outer wall of the sedimentation tank, and several drain pipes connected to one side of the lower end of the sedimentation tank. The key feature is that a filter assembly for adjusting the filtration sequence is provided on one side of the sedimentation tank. One end of the filter assembly is equipped with a feeding component for different filtration sequences. The filter assembly includes a drain pipe fixedly installed on one side of the sedimentation tank. A servo motor drives a transmission plate to rotate the filter cake 180 degrees. The process of "gypsum filter cake preferential neutralization" or "activated carbon filter cake preferential adsorption" can be switched simply by adjusting the filter cake sequence. This eliminates the need for two separate sets of equipment, directly reducing the initial cost of equipment purchase and installation, while also saving the factory space required for two sets of equipment, thus reducing the company's initial investment and site constraints.

The application belongs to the technical field of solid waste resource utilization, and specifically discloses a method and device for preparing silicon-calcium aggregate, sulfuric acid and CO2 by phosphogypsum oxygen-rich high-temperature decomposition. The method uses the adsorption method to obtain pure nitrogen products and oxygen-rich combustion-supporting gas, and provides different reaction temperatures and reaction atmospheres for different reaction stages of the rotary kiln reactor through the multi-point combustion mode, thereby ensuring the controllable high-temperature environment and atmosphere in the kiln. The method improves the combustion efficiency, greatly reduces the amount of flue gas after decomposition, effectively improves the concentration of SO2 in the flue gas and the efficiency of the subsequent sulfuric acid preparation system, and realizes CO2 emission reduction and resource utilization by using the CO2-rich tail gas of the sulfuric acid preparation system for adsorption recovery. The application also provides a device for realizing the method, which combines gas adsorption, oxygen-rich combustion and rotary kiln multi-point combustion equipment, thereby ensuring the effective realization of the process.

The application discloses a quaternary solid waste-based soil stabilizer (GSCP) for a base layer, which is composed of slag (GGBFS), steel slag (SSA), calcium carbide slag (CS) and phosphogypsum (PG) and has a weight ratio of GGBFS:SSA:CS:PG=56:24:12:8. The stabilizer forms C-S-H colloid and ettringite (AFt) through alkaline activation and sulfate activation, does not need to add cement or chemical activator, is used for stabilizing silty clay and steel slag mixed soil, and significantly improves the unconfined compressive strength, splitting tensile strength, water stability and freeze-thaw resistance. Compared with a traditional cement-based stabilizer, the application reduces carbon emission by 82% and cost by 31.25%, provides a low-carbon and economical solution for road engineering, and is suitable for the base layer and the subbase layer of a secondary road or above.

This application relates to the field of heap leaching simulation devices, and more particularly to a heap leaching simulation device for efficient separation of impurities in phosphogypsum. The technical solution includes a modular heap leaching column, multi-layer independently controlled spray support components, a liquid supply system, a liquid return system, and a control unit. Each layer within the heap leaching column is equipped with independently operable spray components. The control unit can sequentially activate different spray levels from top to bottom or bottom to top, and return the leachate collected at the bottom to the top for re-rinsing. By having each layer of phosphogypsum sequentially act as the top, middle, and bottom layers in the circulation, the leachate repeatedly passes through multiple layers of phosphogypsum in various sequences, effectively eliminating the concentration gradient formed by the consumption of effective components and the accumulation of impurities during traditional drip leaching, achieving balanced impurity removal from each layer of phosphogypsum. This invention has advantages such as uniform impurity removal, high reagent utilization, and flexible operation, and is suitable for simulation research of phosphogypsum heap leaching impurity removal processes.

The application provides a method for preparing calcium sulfate hemihydrate whiskers by using a low water activity system, and belongs to the technical field of calcium sulfate hemihydrate whiskers. The method comprises the following steps: aging, washing and drying treatment are performed on phosphogypsum raw materials to obtain modified phosphogypsum; inorganic salt, alcohol for reducing water activity and deionized water are mixed to obtain a mixed solution; the mixed solution is heated to a crystallization temperature, and then the modified phosphogypsum and a polyhydroxy alcohol crystallization regulator are added to perform a crystallization reaction; after the crystallization reaction is completed, solid-liquid separation, washing and drying are performed to obtain calcium sulfate hemihydrate whiskers. The method has simple process conditions and a controllable crystallization process, and can stably prepare calcium sulfate hemihydrate whiskers with a high length-diameter ratio.

The application provides a method for preparing regenerated soil by using phosphogypsum, which takes bulk solid waste phosphogypsum as raw material, and through harmless treatment, microbial alternate fermentation and trace element compound treatment, a regenerated soil with high fertility, stable structure and strong water and fertilizer retention capacity is obtained, which can be directly used for crop planting. The method can promote the plant absorption of Ca, S, P and other elements in the phosphogypsum, and realize the land utilization of all components of the phosphogypsum. In addition, through the formation of organic-inorganic complex by the compounding fermentation technology, the complex can not only promote the formation of soil aggregate structure, but also improve the biological effectiveness of trace elements and the stability of organic matter in the soil, and then build a high-quality regenerated soil with strong water retention and air permeability and long-lasting fertilizer efficiency. The application can not only effectively solve the problem of phosphogypsum storage, but also apply the prepared regenerated soil to farmland improvement, land reclamation and crop planting, and realize the goal of turning waste into treasure.

The present application relates to the technical field of bulk solid waste and road, and provides a pouring type phosphogypsum road stable base mixture, a preparation method, a construction method and application thereof, wherein the high-temperature modified phosphogypsum with specific properties is used as a cementing material, and is mixed with water, an additive and the like in a large amount to form a mixture, the mixture can realize a paving and pouring type process, reduces construction operation and mechanical cost, in addition, for the area that cannot be directly operated by a road roller in the construction of a traditional road stable base, the quality defects of the area that cannot be compacted in the dead angle area or the edge area are avoided, and the obtained base structure is free of curing, can be quickly solidified, has high early strength and good quality.

This application relates to the field of road engineering materials technology, and discloses a method for preparing modified phosphogypsum base material for road engineering, comprising the following steps: mixing aged phosphogypsum with ferrous sulfate heptahydrate, sodium fluorosilicate, and manganese sulfate monohydrate, utilizing the inherent moisture of the phosphogypsum to dissolve the salts and form an acidic slurry; adding heat-curing dry powder and high-speed shearing, utilizing the heat of hydration to raise the temperature to 65℃-85℃ to create a high-temperature strong alkaline environment, initiating manganese catalytic oxidation and slag thermal etching; subsequently, high-pressure injection of a rapid cooling conditioning liquid, utilizing the latent heat of vaporization to rapidly cool to below 45℃ to complete rapid cooling quenching and slow setting locking; unloading and aging to obtain the modified phosphogypsum base material. This invention, through the release of chemical energy by quicklime hydration to construct a high-temperature strong alkaline reaction field, achieves deep mineralization of impurities and reconstruction of the cementitious material network, significantly improving the water stability and mechanical properties of the base material.

The application provides a phosphogypsum residue field water treatment process based on a membrane coupling chemical reactor, relates to the technical field of wastewater resource treatment, and can selectively perform gradient precipitation on fluorine, phosphorus, nitrogen and sulfur, cooperates with a membrane filter for targeted design, realizes a membrane separation process resistant to high-concentration suspended solids, and can make the membrane flux attenuation rate less than 5% / day. The application can effectively separate fluorine, phosphorus and nitrogen from water to form mud with resource value, the value of the resource product per ton of water treatment is higher than the treatment cost, 80% of the recovered water meets the industrial recycling standard, and the phosphogypsum residue field water can be advantageously used for quasi-zero emission and deep high-value resource utilization.

The application discloses a kind of low-carbon composite cementitious material for deep foundation pit engineering and preparation method thereof, belong to building material technical field.The low-carbon composite cementitious material for deep foundation pit engineering, including following weight parts raw materials: 70-90 parts of slag, 5-10 parts of cement, 10-30 parts of phosphogypsum, 5-20 parts of modified secondary aluminum ash, 2-10 parts of modified 5A zeolite, 5-10 parts of organic curing agent, 1-5 parts of carbide slag, 0.03-0.2 parts of alcohol amine early strength agent, 0.5-8 parts of potassium dihydrogen phosphate, 2-8 parts of magnesium oxide, 2-3.5 parts of acid activator, 20-50 parts of water, by making full use of industrial waste slag, secondary aluminum ash, carbide slag, phosphogypsum, reduce resource waste and environmental pollution, convert industrial solid waste into environmental protection building material, realize the diversification of product, functionalization, green, can replace traditional reinforced concrete material, significantly reduce the carbon emission in deep foundation pit engineering, help building industry low-carbon transformation.

This invention discloses a drilling and insertion machine for phosphogypsum, relating to the field of phosphogypsum processing. It includes a frame, a lifting and insertion platform, a guide and limiting mechanism, and an automatic switching device. The frame has four vertically arranged rectangular columns, each with a vertically mounted hydraulic cylinder. The lifting and insertion platform is horizontally mounted between the columns via a positioning roller device. A vertically downward-pointing drill rod is evenly distributed on the lifting and insertion platform. The positioning roller device is hinged to a connecting frame at the upper end of the telescopic rod of the drive hydraulic cylinder device. A pressure block is fixedly connected to the telescopic rod. The guide and limiting mechanism is horizontally connected to the columns via the automatic switching device. This invention reliably guides and limits the swing amplitude of the drill rod during its downward insertion process and achieves synchronous cleaning during the upward return stroke, greatly improving the overall strength of the drill rod and the operational reliability of the equipment.

The application belongs to the technical field of phosphogypsum resource utilization, and particularly relates to a method for directionally recovering fluorapatite from phosphogypsum leaching solution. The method comprises the following steps: performing rough filtration and flocculation pretreatment on the phosphogypsum leaching solution to remove suspended solid matters; then adding an alkaline precipitant to adjust the pH to 6-12 to remove precipitates; then adding a Ca source according to a Ca:P:F molar ratio of (4.8-5.2):(2.8-3.2):(0.8-1.2), or simultaneously adding the Ca source and a P or F source, adjusting the pH to a favorable crystallization interval of 7-9, introducing fluorapatite crystal seeds to stir and crystallize or to stir and crystallize by cooling, and performing solid-liquid separation, so that the obtained solid phase is Ca5(PO4)3F. Through specific synergistic regulation, conditioning, adjustment and induced crystallization process, the method can directionally recover high-purity fluorapatite from the phosphogypsum leaching solution.

The application provides a steam pressure aerated concrete block prepared from phosphogypsum and a method, and belongs to the technical field of resource utilization of bulk solid waste. The method directly uses dry desulfurization phosphogypsum generated in flue gas purification of smelting silicon industry to replace natural gypsum in full amount, and prepares high-performance steam pressure aerated concrete blocks, and provides an industrial production method. The method realizes the consumption of industrial solid waste in bulk, guarantees the mechanical properties, size stability and long-term durability of the final product, thereby promoting the steam pressure aerated concrete industry to complete the resource utilization task of solid waste in high quality, and creating significant environmental, economic and social benefits.

Systems and methods are provided for separation / extraction of rare earth elements (REE), yttrium (Y), and / or radium (Ra) from phosphogypsum. Extraction of REE, Y, and / or Ra can be achieved by treating phosphogypsum with acidic aqueous media at ambient temperature in a reactor at low liquid:solid (L:S) ratios (e.g., L:S in a range of from 1:1 to 15:1), followed by ion exchange chromatography or solvent extraction of relevant anions and / or cations to ensure that the mineral hosts remain undersaturated while the gypsum remains saturated in the solvent. Grinding of the phosphogypsum (e.g., in a slurry mill) can be performed to ensure that minor mineral inclusions are fully accessed by the solvent.

This invention provides a method for predicting the equilibrium adsorption capacity of an adsorbent material for an adsorbate at any initial pH value, belonging to the field of phosphorus removal technology for phosphogypsum lightweight aggregates. The prediction method of this invention includes the following steps: using a Langmuir isotherm adsorption model, obtaining the theoretical maximum adsorption capacity and affinity constant of the adsorbent material for the adsorbate at at least four different initial pH values; establishing empirical functions for the theoretical maximum adsorption capacity and affinity constant with the initial pH value as the independent variable, and substituting these functions into the Langmuir isotherm adsorption model to obtain a pH-corrected isotherm adsorption model; and based on the pH-corrected isotherm adsorption model, predicting the equilibrium adsorption capacity of the adsorbent material for the adsorbate at any initial pH value. The prediction method of this invention can predict the equilibrium adsorption capacity of the adsorbent material for the adsorbate at any initial pH value, eliminating the need for repeated experiments, saving time and effort, and reducing costs.

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.

The present application relates to the technical field of kiln waste heat utilization, and discloses a kiln waste heat utilization device and a rotary kiln system, which comprise an outside cylinder waste heat utilization assembly, the outside cylinder waste heat utilization assembly comprises a shell and a pushing piece, the shell is arranged on the kiln cylinder of the calcining kiln, a processing cavity is formed between the shell and the kiln cylinder, the shell is provided with a first feeding port and a first discharging port which are communicated with the processing cavity, the pushing piece is fixed to the outer wall of the kiln cylinder and is arranged in the processing cavity, and the pushing piece is used for pushing the material to move from the first feeding port to the first discharging port. When the phosphogypsum material is treated, the phosphogypsum material is introduced into the processing cavity, the rotary kiln drives the pushing piece to rotate, the pushing piece pushes the phosphogypsum material to move in the processing cavity, the surface of the hot kiln cylinder exchanges heat with the phosphogypsum material through contact, and the heat is transferred to the phosphogypsum material to dehydrate and dry the phosphogypsum material; the kiln waste heat is actively recovered as a heat source for phosphogypsum modification.

The application relates to the field of detection, and discloses an on-line liquid-solid dual-phase detection system for phosphogypsum, which comprises an equipment preparation module, a sample pretreatment module, a sample detection module, a sample data acquisition module, a sample data analysis module and a sample data evaluation module. The required detection equipment is prepared through the equipment preparation module, the phosphogypsum sample is pretreated through the sample pretreatment module, the phosphogypsum sample is more fully reacted, the accuracy of subsequent data information is improved, the content of each substance in the phosphogypsum sample is detected through the sample detection module, data for subsequent data analysis is provided, the collected data is summarized through the sample data acquisition module, each aspect of data is analyzed through the sample data analysis module, comprehensive evaluation is carried out through the sample data evaluation module, whether the treated phosphogypsum sample can be recycled is more accurately judged, and the resource conversion utilization rate of the phosphogypsum is effectively improved.

This invention relates to the field of mine backfilling technology and discloses a process for backfilling phosphogypsum solid waste in phosphate mine goafs. The process includes: erecting a wavy backfilling pipeline along the base plate, consisting of alternating uphill and downhill pipe sections; pumping prepared phosphogypsum slurry into the pipeline for transport; as the slurry flows through the uphill pipe section, its own weight increases the axial extrusion pressure, driving free water to seep into the pipe wall to form a boundary liquid film; as it flows through the downhill pipe section, its own weight reduces the extrusion pressure, generating negative pressure to draw the boundary liquid film back into the slurry; by alternating pipe sections, a periodic seepage and backflow cycle of free water is established, transporting the slurry to the goaf for consolidation. This invention utilizes the undulation of the pipeline to induce stress alternation in the slurry, spontaneously constructing a lubricating liquid film regeneration mechanism, blocking liquid phase dissipation, eliminating the need for additional components, reducing friction along the route, and ensuring stability during long-distance transport.

The utility model discloses a kind of phosphogypsum filtrate screening machines, including support table, the top of the support table is fixedly connected with support frame, the top of the support table is fixedly connected with separation tank, the top of the support frame is fixedly connected with mixing tank, this phosphogypsum filtrate screening machine, by setting drive mechanism, when gypsum mixed solution processing ends, gypsum mixed solution is injected to the inside of filter cover, one motor is started at this time, so that one motor can be driven gear ring fast rotation by gear, that is, drive filter cover fast rotation, so that the liquid in filter cover inside is subjected to centrifugal force and can flow fast to the inside of separation tank, so that gypsum solid can be discharged by second discharge pipe, so that the automatic filtration separation effect of gypsum mixed solution is achieved, and then greatly improve gypsum filtrate screening convenience.

The application discloses a phosphogypsum-based desertification soil modifier and a preparation and application method thereof, and belongs to the technical field of soil modifiers. The preparation method of the modifier comprises the following steps: washing and pH regulator adjusting of phosphogypsum to obtain pretreated phosphogypsum; mixing the pretreated phosphogypsum, humic acid and / or biochar, calcium-based bentonite powder, rotten straw and the like, spraying an activated trace element liquid obtained by chelation of EDTA disodium salt and metal inorganic salt, and then atomizing and granulating the activated trace element liquid through a bonding water-retaining agent, and then low-temperature drying, cooling, and spraying of composite microorganism bacteria. The modifier has high environmental safety and strong wind erosion resistance, can significantly reduce soil bulk density, improve field water holding capacity and organic matter content, and significantly improve the survival rate of psammophyte, and is suitable for industrialized large-scale production and desertification treatment popularization.

The present application relates to the technical field of intelligent mortar preparation, and particularly relates to a phosphogypsum mortar process optimization method based on an intelligent sensor, the present application collects the cleanliness characteristic parameters of the target phosphogypsum mortar slurry at the discharge port in a historical period; analyzes the cleanliness index; determines whether the slurry of the target phosphogypsum mortar meets the preparation standard based on the comparison result of the cleanliness index and the predetermined cleanliness qualified threshold; if the slurry meets the preparation standard, the performance characteristic parameters of the target phosphogypsum mortar in the historical period are collected; the performance state index is analyzed; the product quality of the target phosphogypsum mortar is determined to be abnormal based on the comparison result of the performance state index and the predetermined performance state qualified threshold; if the product quality is abnormal, the performance deviation value is calculated; the cause of the abnormal product quality is determined based on the performance deviation value, and a corresponding processing strategy is executed. The present application improves the product qualified rate control precision of intelligent production of phosphogypsum mortar.

This invention discloses a method for preparing an acidic soil conditioner, belonging to the field of soil improvement technology. This method uses dolomite powder, phosphogypsum, and wood ash as core raw materials, without adding any additional components. By precisely controlling the raw material pretreatment parameters, mixing ratios, activation reaction conditions, and post-treatment processes, the prepared acidic soil conditioner can rapidly adjust soil pH, improve soil fertility and water retention capacity, and continuously improve soil physicochemical properties, suitable for various acidic soils (pH 3.5~6.0). The preparation process of this invention is simple, highly controllable, has high raw material utilization, produces no harmful byproducts, and has low preparation costs. The mixing ratio formulas and reaction parameter formulas involved are all independently designed.

This invention relates to a method and system for desilication of phosphogypsum. The method includes the following steps: preparing a gypsum slurry using phosphogypsum and a characteristic mixing solution; converting the gypsum slurry to concentrated sulfuric acid to obtain a crystallized slurry; subjecting the crystallized slurry to a silica-collecting agent for desilication to obtain low-silica anhydrous gypsum slurry and high-silica anhydrous gypsum slurry; and filtering the low-silica and high-silica anhydrous gypsum slurries to pressure filtration to obtain low-silica anhydrous gypsum and high-silica anhydrous gypsum, respectively. The phosphogypsum desilication system includes a reslurry tank, a crystallization tank, and a desilication device connected in series. The desilication device is also connected to a first filter press, a second filter press, a first reflux pipe, and a second reflux pipe, which extend into the reslurry tank. By employing the technical solution of this invention, the gypsum slurry is first converted to silica with concentrated sulfuric acid, releasing silicon elements trapped between the crystals, reducing the difficulty of desilication, reducing the consumption of silica-collecting agent, and reducing production costs.