2189 results about "Gangue" patented technology

The invention discloses a negative carbon coplanar filling system arrangement and mining method, which comprises the following steps of: stoping by adopting a rear gangue high-porosity filling coal mining technology, retaining a stoping roadway on one side of a filling section by utilizing a gob-side entry retaining technology, and reinforcing by adopting a roadway-side support body; the mining roadway serves as a CO2 filling roadway of the working face and a mining roadway on one side of an adjacent filling working face; when the working face advances by 300-500 m, the working face is separated from a rear goaf through a sealing wall, and a sealed storage space is formed; then, drill holes are formed in the goaf through the CO2 injection and filling roadway, and CO2 injection and filling pipelines are arranged in the mining roadway and the drill holes; and CO2 is injected into the goaf by the CO2 injection pump through the CO2 injection pipeline, and after injection is completed, CO2 injection in the next closed space is started until injection of the working face is completed. The system is simple in arrangement, CO2 filling and coal mining filling do not interfere with each other, operation is flexible, the sealing performance of the sealing space is good, the dual purposes of solid waste disposal and CO2 sealing are achieved, and green mining of coal resources is achieved.

The invention relates to the technical field of gangue filling, in particular to a coal mine gangue roadway type filling method which comprises the following steps: (1) screening gangue, and classifying the gangue into corresponding particle size groups according to particle sizes; (2) designing grading schemes according to the particle size groups divided in the step (1), performing simulation by using PFC2D numerical simulation software to obtain stress-strain curves of the grading schemes, and selecting the grading scheme with the maximum peak stress as the optimal grading scheme; and (3) filling the roadway type filling area according to the optimal grading scheme determined in the step (2). According to the method, the optimal grading scheme is determined by simulating the stress damage process of the internal structure of the original waste rock filling body under different particle size grading schemes through PFC2D, simulation verification shows that the stress concentration condition of the left side and the right side of the filled roadway is improved, the filling body filled in the roadway can replace roadway surrounding rock to bear part of pressure, and the working efficiency is improved. The problem that the crushing pressure is large when small-particle gangue is used in the prior art is solved.

The invention discloses a negative carbon filling mining method for a gangue high-porosity material, and relates to the technical field of CO2 storage and filling mining, which comprises the following steps: spraying a rapid cementing material while blanking a gangue bulk material, forming a high-porosity filling body in a goaf, continuously injecting liquid CO2 into the closed high-porosity filling body through a pipeline, and filling the high-porosity filling body into a high-porosity filling body. The underground efficient sealing of CO2 is realized; the method is simple in design, the filling technology and CO2 storage are combined, efficient mining and filling are achieved, coal resource mining is not affected, the mine green mining and negative carbon filling construction process is promoted, a new concept of carbon storage is provided, wide application and research significance is achieved, and compared with a solid filling mining method, the method has the advantage that the method has a wide application prospect. And the gangue is fixed by using the rapid binding material to form a high-porosity material with bearing performance, so that the cost of a filling mining technology is reduced, and the original tamping process is simplified.

The invention discloses a carbon storage space construction method for an artificial reconstruction plugging key layer, and the method comprises the following steps: S1, carrying out geological exploration, and determining the thickness and lithology of each overlying rock stratum; s2, determining the height of a gas guide fissure zone generated after the coal seam is mined by filling based on theoretical analysis and actual measurement data; s3, on the basis of geological data and the height of the gas-conducting fissure zone, the position of an artificial reconstruction plugging key layer and the position of a grouting layer are determined; s4, filling mining is carried out, grouting is carried out on overlying strata to reconstruct and block a key layer, and a carbon storage space is formed; and S5, carbon dioxide gas is injected into the goaf through a pipeline, carbon dioxide concentration monitoring is conducted on the working face while negative carbon filling is conducted, earth surface rock movement monitoring is conducted on the earth surface, and the negative carbon filling effect is judged. According to the method, the carbon storage space is formed by manually rebuilding and blocking the key layer while the gangue is filled, the space after coal mining can be effectively utilized for storing carbon dioxide, and emission of greenhouse gas is effectively reduced.

The invention provides a modified coal gangue-based large-flow-state grouting and water plugging material and a preparation method thereof. Comprising 80-90 parts of a coal gangue sample, 1-5 parts of Portland cement, 1-5 parts of sulphoaluminate cement, 0.51-3 parts of a polycarboxylic acid water reducing agent, 1-4 parts of cellulose ether with the viscosity of 200w, 0.1-5 parts of a calcium oxide expanding agent, 0.5-5 parts of a plastic expanding agent, 0.5-1 part of redispersible latex powder, 0.5-5 parts of polyacrylamide with the molecular weight of 1000 and water, and the water-material ratio is 0.4. According to the modified coal gangue-based large-flow-state grouting and water plugging material and the preparation method thereof, the cement consumption can be remarkably reduced, the cost is reduced, the utilization rate of solid wastes (such as coal gangue) is increased, and the material has good flow-state performance and adjustable setting time; the method is suitable for deep and large shaft surrounding rock water seepage treatment in coal mining and other mine engineering.

The invention discloses a low-carbon polymer modified all-solid waste premixed fluid-state soil, which is prepared from the following components in parts by weight: 10-30 parts of low-carbon polymer modified all-solid waste premixed fluid-state soil, the concrete is prepared from the following components in parts by weight: 5-10 parts of a modifier, 5-10 parts of an exciting agent, 1-5 parts of an additive, 1-5 parts of a retarder, 10-20 parts of coal gangue powder, 10-20 parts of carbide slag, 10-20 parts of bentonite, 35-40 parts of fly ash, 35-40 parts of slag powder, 100 parts of clay powder, 145 parts of machine-made medium sand and 150 parts of water. According to the invention, the polymer polyacrylamide is added into the fluid soil, so that the compressive strength of the fluid soil stone body is improved; when the polyacrylamide is mixed with the fluid soil, active components in the polymer emulsion and components in the fluid soil are subjected to a cross-linking reaction to form a more complex network structure, so that a dispersion system of the slurry can be remarkably improved, the repulsive potential energy among particles in a multiphase dispersion is reduced, and the integrity and the stability of the slurry are enhanced; the slurry is not easy to separate when being injected into underground rock strata or fractures, and good uniformity and flowability are maintained.

The invention discloses a coal gangue abandoned mine ecological restoration water retention technology, and belongs to the technical field of environmental protection. According to the remediation technology, after the surface soil of the mine is loosened, the alkaline waste and the heavy metal adsorbent are firstly added for neutralization and adsorption pretreatment, and then the composite soil conditioner is continuously added to sequentially cover and construct the improved composite layer soil in a gradient manner; the composite soil conditioner comprises fly ash, steel slag, local clay, straw fibers, water-retaining slow-release microcapsules, charcoal, papermaking white mud and humus soil, high-resistance vegetation is transplanted on the obtained improved composite layer soil, meanwhile, a microbial agent is inoculated, and remediation is completed after the soil is maintained to be stable. According to the method, multiple technical processes are integrated and matched and cooperated with one another, the purpose of long-acting water retention is finally achieved through the combined action of multiple remediation mechanisms of materials, vegetation and microorganisms, and compared with a traditional mine remediation technology, the method is better in stability and longer in acting time and has a good application prospect.

The invention belongs to the technical field of civil engineering materials, and particularly relates to a coal gangue-based solid waste cementing material as well as a preparation method and application thereof. The coal gangue-based solid waste cementing material is prepared from the following raw materials in percentage by mass: 60-80% of activated coal gangue powder, 5-20% of an exciting agent, 5-15% of superfine slag powder, 2-5% of silica fume, 1-3% of gypsum and 1-3% of fan blade short fibers. According to the invention, solid waste resources (coal gangue and superfine slag powder) are recycled, and on the basis of consumption of the solid waste resources, the coal gangue-based solid waste cementing material obtained by using the solid waste resources has good mechanical properties and durability, and can meet the use requirements of highway engineering base layers.

The invention relates to the technical field of mine solid waste treatment and carbon dioxide sealing and storage, and particularly discloses a system and a method for sealing and storing carbon dioxide by utilizing coal-based solid waste and mine water to prepare slurry. The system comprises a cement bin, a gangue bin, a coal ash bin, a gasified slag bin, a mine water storage tank, a stirring reaction kettle, a carbon dioxide storage tank, a slurry temporary storage tank, a vacuum pump and a slurry pump, and the stability and adsorption efficiency of carbon dioxide fixation are improved in the mode that coal-based solid waste, mine water and carbon dioxide are subjected to chemical reaction and physical adsorption; meanwhile, the prepared backfill slurry has high-strength anti-pressure ability, the stability of the backfilled underground goaf is better improved, further, coal-based solid waste and mine water are utilized for waste recycling, and the carbon dioxide storage cost is reduced.

The invention relates to a flotation method for niobium-containing minerals, and belongs to the technical field of mineral separation. The method comprises the steps that niobium-containing ore is subjected to crushing, ore grinding and size mixing, obtained ore pulp is subjected to weak magnetic treatment to remove strong magnetic minerals, after the pH of magnetic separation tailings is adjusted, a flotation reagent containing an iron mineral inhibitor and an amine collecting agent is added for silicon-niobium bulk flotation, and after the pH of obtained silicon-niobium bulk concentrate is adjusted, the obtained silicon-niobium bulk concentrate is subjected to flotation separation. And a flotation reagent containing a hydroximic acid metal organic complex collecting agent and a siliceous mineral inhibitor is added for silicon-niobium separation flotation, and niobium concentrate is obtained. According to the method, iron gangue mineral removal is achieved through step-by-step flotation by means of the amine collecting agent, silicon separation is achieved by means of the hydroximic acid metal organic complex collecting agent, efficient enrichment of the niobium mineral is achieved, the step of strong magnetic iron removal is avoided, the process is simplified, and the loss rate of the niobium mineral is reduced.

The invention belongs to the field of coal solid waste resource utilization, and relates to a method for preparing a NaP type molecular sieve by utilizing kaolinite rock type coal gangue. The method comprises the following steps: 1) crushing and grinding blocky kaolinite rock type coal gangue into powder; 2) roasting and activating the coal gangue powder to obtain metakaolin; 3) mixing and stirring metakaolin, sodium hydroxide, a silicon source and deionized water to obtain an initial solution; 4) standing and aging the initial solution to obtain a precursor solution; 5) performing dynamic hydrothermal crystallization treatment on the precursor solution to obtain crystals; and 6) washing, neutralizing, centrifuging and drying the crystal to obtain the NaP type molecular sieve. The kaolinite rock type coal gangue is used as a raw material to replace a traditional chemical raw material required by molecular sieve synthesis, and resource utilization of aluminosilicate solid waste is promoted. According to the method, seed crystals or guiding agents are not required to be added in the molecular sieve crystallization process, and special crystallization methods such as microwaves and ultrasound are also not required, so that the process is simple, the cost is low, and the method is environment-friendly.

The invention relates to a concrete composition, concrete as well as a preparation method and application of the concrete. The concrete composition comprises the following components: coal gangue aggregate, a gel material and a water reducing agent, the coal gangue aggregate comprises crushed coal gangue, a coarse coal gangue material and coal gangue stone powder, and the average particle size of the coarse coal gangue material is larger than that of the coal gangue stone powder and smaller than that of the crushed coal gangue; the gel material comprises slag, gypsum and carbide slag. According to the concrete composition, the coal gangue of different grades is adopted as the aggregate and compounded with the gel material and the water reducing agent to prepare the concrete, all the raw materials have a synergistic effect, the durability, workability, crack resistance and other performance of the concrete are improved, the production cost is reduced, and the requirement of coal mine construction for high-performance concrete is met.

The invention discloses a laser-electric pulse-water jet synergistic fluidized coal mining device and method, and the device comprises a gas extraction system which is used for extracting gas in the coal mining process; the laser perforation system is used for perforating the coal seam through a laser; the high-voltage electric pulse fracturing system is used for fracturing the to-be-fractured coal body between two adjacent perforations through high-voltage electric pulses to obtain a crushed coal body and a to-be-crushed coal body; the water jet coal breaking system is used for performing hydraulic cutting on the to-be-broken coal body to obtain a coal-rock mixture; the fluidization coal mining system is used for conveying the coal and rock mixture into the ground sedimentation tank to complete coal mining; and the backfilling system is used for backfilling the goaf with the gangue mixed mortar separated in the sedimentation tank. The coal mining technology under the synergistic effect of laser, electric pulse and water jet is adopted, accurate drilling and efficient crushing of a coal seam can be achieved, waste of water resources is reduced, and the coal mining efficiency is remarkably improved.

The invention belongs to the technical field of solid waste utilization, and discloses a low-cost mine filling material and a preparation method thereof. The low-cost mine filling material comprises the following raw materials in parts by mass: 100 parts of red mud, 15-25 parts of an acid activator, 4-10 parts of fly ash, 4-10 parts of coal gangue, 5-12 parts of basalt fiber waste silk, 1-8 parts of a waste molecular sieve-based self-repairing material and 70-100 parts of water. Various industrial solid wastes such as the red mud, the ardealite, the fly ash, the coal gangue, the basalt fiber waste filaments and the waste silicon-aluminum molecular sieves are adopted, so that the source of the mine filling material can be effectively expanded, the cost is low, the environmental pressure caused by waste stacking is reduced, and good economic and environmental benefits are generated.

The invention belongs to the technical field of filling of an aluminum goaf under coal, and particularly relates to a bag type filling synergistic mineralization carbon dioxide sequestration method for mining a red mud-based filling material based on an aluminum strip under coal. Comprising the following steps that S1, filling bags are arranged; s2, grouting the aluminum layer bottom plate; s3, CO2 is conveyed; s4, red mud slurry is injected; s5, grouting between coal and aluminum layers; according to the method, through aluminum layer bottom plate grouting and coal aluminum interlayer grouting, Ordovician limestone water is effectively prevented from protruding out, harmful substances are effectively prevented from permeating underground water, meanwhile, a sealing cover layer for CO2 injection is also used, and the mineralization amount of CO2 is effectively increased. The main components of the red mud slurry are red mud, fly ash and crushed coal gangue, solid waste accumulation and environmental pollution are effectively reduced while the filling cost is remarkably reduced, recycling is achieved, the red mud is sealed in a flexible filling bag in a goaf, and if necessary, valuable elements in the red mud can be used for filling the goaf. And the tea leaves can also be extracted.

The invention discloses a method and system for designing the roof cutting height of coal-pillar-free self-forming roadway mining, and belongs to the technical field of coal mining, and the method comprises the following steps: according to the size of a stope, the advancing length of a working face and the thickness of an overlying strata top plate, analyzing the crushing and expanding characteristics of roof cutting caving rock mass through numerical simulation and similar simulation tests; on the basis of the crushing and swelling characteristics of the roof-cutting caving rock mass, the crushing and swelling amount of caving gangue in the bilateral roof-cutting range is calculated; and when the actual mining amount reaches the collapsed gangue crushing and swelling amount, the mining height at the moment serves as the optimal roof cutting height. According to the method, the collapse thickness of the overlying strata can be increased, more broken and expanded gangues are generated, the goaf can be fully filled, the broken and expanded balance of the overlying strata is realized, and the broken and expanded gangues are utilized to compensate the coal seam mining space, slow down the deformation of the overlying strata and relieve the damage to the surface ecological environment.

The invention discloses a method for converting niobium minerals in niobium rough concentrate into pyrochlore. The method comprises the following steps: (1) mixing the niobium rough concentrate with a modifier, a fluorine-containing reagent, a reducing agent and a binder, and carrying out compression molding; and (2) roasting the mixed blank for a set time, preserving heat, and quenching to obtain pyrochlore type rough concentrate. The method comprises the following steps: (1) carrying out magnetic separation on pyrochlore type rough concentrate; (2) performing heating and acid leaching on the magnetic separation tailings; and (3) carrying out flotation to obtain niobium concentrate. According to the method, iron components in the rough concentrate are reduced into magnetic iron minerals, niobium minerals are converted into non-magnetic pyrochlore, follow-up niobium-iron separation is facilitated, and the grade of niobium in the niobium concentrate obtained through production can be effectively improved; and the method is high in adaptability to niobium rough concentrate, is also applicable to alkaline or acidic niobium rough concentrate, is relatively small in gangue mineral change and low in conversion reaction temperature, and has the advantages of energy conservation and emission reduction compared with other regulation and control processes.

The invention relates to the technical field of soil remediation, in particular to a soil remediation formula optimization method based on solid waste raw material charcoal improvement, which comprises the following steps: acquiring a coal gangue powder material flow and a sludge material flow, respectively performing component detection on a soil sample set, the coal gangue powder material flow and the sludge material flow to obtain a component content report, performing multi-factor combination on the plurality of biochar, the plurality of microbiota and the plurality of enrichment plants to obtain a plurality of first initial raw material combinations; and constructing a plurality of unit soil remediation experiment groups based on the component content report, the plurality of first initial raw material combinations, the soil sample set, the coal gangue powder material flow and the sludge material flow, and performing a soil remediation experiment on the plurality of unit soil remediation experiment groups based on a preset test pause condition to obtain an optimal scheme. According to the invention, the formula optimization of targeted soil remediation can be realized by utilizing the charcoal, the coal gangue and the municipal sludge.

The invention relates to lithium slag-based artificial soil based on different soil layer functions and a preparation method of the lithium slag-based artificial soil. The lithium slag-based artificial soil comprises a surface soil layer, a leaching layer, a deposition layer and a parent material layer according to soil profile layers. Compared with an existing technology for preparing artificial soil from solid waste materials such as lithium slag, red mud and coal gangue, the preparation process is simple, the cost is low, and the prepared soil is free of secondary pollution risk and is environmentally friendly; the preparation of the artificial soil of soil layers with different ecological functions in a soil profile configuration can be realized, so that the artificial soil meets the requirements of mine land reclamation and mine ecological restoration on the artificial soil with a stable soil body structure, the green restoration concept that lithium slag comes from a mine and then returns to the mine is embodied, and precious natural soil resources are not consumed; and a plurality of solid waste materials which are difficult to dispose can be recycled, the recovery and treatment cost of the mine ecological environment after mining is reduced, the pollution caused by solid waste stockpiling is reduced, and the ecological environment of a mining area and the surrounding of the mining area is improved.

The invention relates to the technical field of coal underground gasification control, in particular to a stable control method for the gasification process of deep coal passing through dirt band. The gas pressure distribution data and the pore change characteristic data of the deep coal gasification area are collected in real time through the distributed sensor array, the gas dynamic correction permeability is generated, the gas injection pressure is adjusted and dynamically corrected according to the gas dynamic correction permeability, and the gas pressure is kept stable; screening a potential risk area through a main stress direction deviation angle and a stress concentration coefficient in the dirt band layer, analyzing a shear stress threshold value of the potential risk area based on a stress-strain coupling model, and judging a stability evaluation index of the potential risk area; and when the stability evaluation index is lower than a threshold value, a multi-stage emergency regulation and control mechanism is triggered, and a dirt band layer reinforcement intervention scheme is generated. By means of multi-source data fusion and a dynamic feedback mechanism, the limitation of a traditional method for lagging response of the instability risk of the dirt band layer is broken through, and full-closed-loop intelligent stable control over the gasification process is achieved.

The invention relates to the technical field of bauxite mining, in particular to a green mining method for bauxite under coal, and mainly solves the technical problems that pollutants in a goaf of an upper coal seam easily enter an aluminum layer, the recovery rate is low, an overlying rock layer easily collapses and a large amount of solid waste polluting the environment is generated in existing mining of bauxite under coal. The method comprises the following steps: S1, selecting a target rock stratum; s2, permeability transformation is conducted on the target rock stratum; s3, in-situ presplitting of bauxite; and S4, pillar-free comprehensive mechanical bag type filling mining is carried out. According to the method, old kiln water and poisonous and harmful gas in a coal seam goaf can be prevented from entering an aluminum mining working face during aluminum layer recovery, and the safety of aluminum layer recovery operation is greatly improved; ore body strength weakening can be achieved, fully-mechanized coal mining equipment loss is reduced, and fully-mechanized coal mining efficiency is improved; the recovery rate of bauxite can also be improved, and an overlying rock layer is prevented from collapsing; the coal gangue and the red mud can be treated and utilized in a large-scale and green manner, and the influence of industrial solid waste of the coal gangue and the red mud on the ecological environment is avoided.

The invention relates to the technical field of soil remediation, in particular to a soil ecological remediation agent based on coal gangue-fly ash and a preparation method of the soil ecological remediation agent. The soil ecological restoration agent comprises the following components in parts by weight: 40-50 parts of coal gangue-fly ash mixed powder, 6-12 parts of a microbial agent, 15-20 parts of humic acid, 6-12 parts of sodium polyacrylate, 8-12 parts of straw carbon, 20-25 parts of bentonite and 4-6 parts of aluminum sulfate. The soil ecological restoration agent can supplement trace elements into soil, meanwhile, the coal gangue-fly ash can adsorb heavy metals in the soil so as to fix the heavy metals, the microbial agent can be loaded on the surface of the coal gangue-fly ash, the heavy metals adsorbed on the coal gangue-fly ash are precipitated through the microbial agent, and the heavy metals adsorbed on the coal gangue-fly ash can be fixed. The concentration of heavy metal ions in the soil is reduced.

The invention belongs to the technical field of solid waste concrete, and discloses fireproof sound-insulation heat-preservation light-weight high-strength all-solid waste concrete and a preparation method thereof.The fireproof sound-insulation heat-preservation light-weight high-strength all-solid waste concrete is prepared from an all-solid waste fireproof cementing material, all-solid waste light aggregate, water and a functional additive; the all-solid-waste fireproof cementing material comprises an alkaline activator component and an active powder component, the alkaline activator component comprises red mud and carbide slag in a mass ratio of (1.5-2.5): 1, and the active powder component comprises granulated blast furnace slag and low-temperature activated calcined coal gangue powder in a mass ratio of (1.0-1.8): 1; the all-solid-waste lightweight aggregate comprises coarse aggregate and fine aggregate in a mass ratio of (1-1.5): 1, wherein both the coarse aggregate and the fine aggregate comprise high-temperature expanded and roasted coal gangue lightweight aggregate; wherein the low-temperature activated and calcined coal gangue powder is obtained by performing gradient temperature control calcination on coal gangue at 650-800 DEG C and then grinding the coal gangue until the specific surface area is greater than or equal to 500m < 2 > / kg; the high-temperature expanded and roasted coal gangue lightweight aggregate is obtained by roasting and expanding coal gangue at 1100-1300 DEG C and then screening and grading.

The invention discloses a crushing and conveying device for coal gangue filling, and particularly relates to the field of ore conveying, the crushing and conveying device comprises two conveying belts which are the first conveying belt and the second conveying belt respectively, and an auger mechanism used for collecting materials, the second conveying belt is located on the first conveying belt in a sliding assembly mode, and the auger mechanism is located on the second conveying belt in a sliding assembly mode. The auger mechanism is located on the second conveying belt through the assembling base, rotates in multiple directions and can synchronously move on the first conveying belt along with the second conveying belt, the auger mechanism comprises a material receiving bin and spiral blades located in the material receiving bin and installed in the length direction, the material receiving bin rotates around the assembling base in multiple directions to receive materials, and through the two sets of conveying belts, the spiral blades can rotate in multiple directions; the second conveying belt is assembled on the first conveying belt in a sliding mode, the second conveying belt is controlled by the driving unit to move up and down along the first conveying belt, and meanwhile, the auger mechanism rotationally assembled at the end of the second conveying belt is matched, so that the blanking point of the first conveying belt is fixed, the receiving end completes fan-shaped receiving, and even distribution and accurate blanking of gangues are achieved. And the problem of sedimentation caused by non-uniform accumulation is avoided.

The invention discloses a method for extracting and separating rare earth elements from coal-based solid waste. Coal gangue and fly ash are used as raw materials. The extraction and separation method comprises the following steps: S1, roasting activation pretreatment of the coal-based solid waste; s2, carrying out sulfuric acid leaching on the coal-based solid waste subjected to activation pretreatment in the step S1, and carrying out solid-liquid separation to obtain a sulfuric acid leaching solution and solid residues; s3, an anti-solvent is slowly added into the sulfuric acid leaching solution separated in the step S2, and rare earth elements are selectively precipitated and recycled; and S4, evaporating the filtrate obtained by separation in the step S3, and recovering the anti-solvent for reutilization. According to the method provided by the invention, the technological process can be shortened, the technological steps are simplified, and the selective recovery of rare earth elements in the leachate is easier.

The invention relates to the technical field of building materials, and provides washing gangue concrete with high slump loss resistance and a mixing process thereof. The high-slump-retaining washed gangue concrete is prepared from the following raw materials in parts by weight: 200 to 220 parts of cement, 140 to 150 parts of mineral powder, 60 to 65 parts of fly ash, 680 to 720 parts of machine-made sand, 950 to 970 parts of washed gangue, 150 to 160 parts of water, 16 to 17.5 parts of a water reducing agent, 0.15 to 0.3 part of a slump retaining agent and 4 to 4.3 parts of polyethylene glycol. The slump retaining agent is hydroxypropyl methyl cellulose ether; and the viscosity of the hydroxypropyl methyl cellulose ether is 100 thousand mPa.s to 300 thousand mPa.s. According to the technical scheme, the problems of poor slump retaining performance and low compressive strength of washed gangue concrete in the prior art are solved.

The invention belongs to the technical field of rare earth element separation, and particularly relates to a fluidization, separation and enrichment method for rare earth element carrier ore of mine solid waste. Comprising the following steps that a mixture of pulverized coal and ferrosilicon powder serves as a separation medium and is added into a vibration gas-solid separation fluidized bed device, and the vibration frequency, the amplitude parameter and the gas speed of pulse airflow of the vibration gas-solid separation fluidized bed device are set according to the density of mine solid waste rare earth element carrier minerals, the separation granularity and the content of rare earth elements; the mine solid waste rare earth element carrier minerals form a scattered fluidization environment with uniform and stable density under the vibration-airflow synergistic effect of the vibration gas-solid separation fluidized bed, density gradient layering is carried out, and separation and pre-enrichment of rare earth elements in the mine solid waste rare earth element carrier minerals are achieved. According to the method, high-density coal gangue containing high rare earth elements is efficiently and accurately sorted, and the problem of pre-enrichment of the rare earth elements in mine solid waste rare earth element carrier minerals is effectively solved.

The invention relates to a method for synthesizing mordenite by using coal gangue as a raw material. The method comprises the following steps: firstly, carrying out acid treatment and activation on the coal gangue, extracting a silicon source and an aluminum source in the coal gangue as raw materials by accurately adjusting the use amount of sodium hydroxide, and finally preparing the pure-phase mordenite by accurately adjusting the content of acetic acid. The method for synthesizing the mordenite from the coal gangue is low in experiment cost, simple in process, good in repeatability and convenient for large-scale popularization to realize high value-added utilization of the coal gangue.

The invention discloses a caving zone filling method based on solid-liquid-gas three-waste synergistic mineralization, and relates to the technical field of mine filling. Comprising the following steps that goaf grouting filling parameters are determined through a multi-source data fusion analysis method; the filling material is prepared by taking mining area solid wastes, mining area liquid wastes and gas wastes as basic materials; filling materials are injected into the residual space of the caving zone of the goaf of the underground working face through a ground grouting filling system, the loose gangue structure in the goaf is cemented, and a filling body is formed; the method realizes the utilization of solid-liquid-gas three wastes in the mine, achieves the purposes of reducing ground surface settlement, protecting water resources and the like, and accords with the low-carbon and high-efficiency mineral development concept.

The invention relates to the technical field of coal gangue magnetic separation, in particular to a coal gangue magnetization fluidized roasting device which comprises a raw material preprocessing module, a fluidized magnetization roasting module, a magnetic separation module, a data center module and a mass feed module. The raw material preprocessing module realizes gradient crushing and dynamic screening of coal gangue through a multi-stage crushing unit and a closed cycle pneumatic classification device, and the online particle size analysis device monitors particle size data in real time and transmits the particle size data to the data center module; the fluidization and magnetization roasting module adopts a double-cavity reaction tower structure, and is combined with an infrared thermal imager array and a PI (Proportional Integral) controller to regulate and control the mixing proportion of fluidization gas and inhibit the oxidation of ferric oxide; through multi-module data driving optimization, the technical problems of insufficient multi-variable coupling regulation, low separation precision and high energy consumption are solved, and low-carbon efficient resourceful treatment of the coal gangue is realized.