3554 results about "Tailings" patented technology

The invention provides a solid waste filling material ratio optimization method of a magnesium slag-steel slag composite cementing material, and relates to the technical field of solid waste filling. The method comprises the following steps: mixing magnesium slag, steel slag, desulfurized gypsum and mineral slag to prepare a cementing material, and carrying out pretreatment and physicochemical property analysis on raw materials by taking tailings and waste rocks as filling aggregates; then designing a cementing material proportioning scheme and carrying out strength test to obtain an optimal ratio of the cementing material; then considering different slurry concentrations and plastic-to-bone ratios, and carrying out an all-solid waste filling slurry rheological test and an all-solid waste cementitious body strength test; and finally, according to the two test results, establishing a multi-objective optimization model taking the on-way resistance and the filling material cost as optimization objectives and taking the strengths of cementitious bodies at different ages as constraint conditions, and determining optimal parameters of the full-solid waste filling material. According to the invention, resource utilization of the metallurgical solid waste and the mine solid waste is realized, the bottlenecks of high carbon emission and high cost of a cement-based filling material are broken through, and a solution is provided for co-processing of the mine solid waste.

The invention provides an iron tailing-based geopolymer electromagnetic wave attenuation performance optimization control method and system, and relates to the technical field of electromagnetic wave attenuation, and the method comprises the steps: 1, setting a synthesis condition parameter set of an iron tailing-based geopolymer in a simulation environment, comprising virtual matching of raw materials, particle size distribution, concentration gradient of an alkali activator and curing temperature-time coupling parameters, and a forming process is deduced through an amorphous phase topological configuration and a pore network evolution rule of aluminosilicate gel in a geopolymer microstructure; and step 2, constructing an interface reaction kinetics process based on the synthesis condition parameter set, and generating an enhanced interface digital mapping system with periodically arranged aluminum oxide and silicon oxide regular tetrahedrons through virtual iteration of mineral admixture ratio and forming process parameter boundary conditions. According to the method, a strengthened interface is constructed through simulation synthesis, a loss layer database is established, and microstructure regulation and control and multi-band electromagnetic wave efficient attenuation are achieved.

The invention provides an intelligent early warning method and system for phosphorus tailing improved soil heavy metal migration, relates to the technical field of computers, and accurately predicts the main migration direction of heavy metal pollutants by combining factors such as terrain gradient, hydrological flow direction and soil structure heterogeneity. The method comprises the following steps: acquiring soil information of a to-be-detected area and soil potential information of a detection point in the to-be-detected area; determining heavy metal concentration information of the detection point according to the soil potential information; the heavy metal concentration information is used for reflecting heavy metal concentration distribution conditions corresponding to different soil depths of the detection points; determining migration direction information of the heavy metal at the detection point; the migration direction information is used for reflecting the corresponding heavy metal migration direction distribution condition of the heavy metal of the detection point in the three-dimensional space; and predicting a pollution diffusion area based on the migration direction information, the organic decomposition rate and the underground water level fluctuation information, and performing visual display.

The invention belongs to the technical field of roadbed engineering, and particularly relates to a construction uniformity evaluation method for a clay improved copper tailing roadbed. The method comprises the following specific steps: S1, determining the proportion of the clay improved copper tailing roadbed filler; s2, applying the blended clay improved copper tailings to roadbed construction; and S3, carrying out construction detection on the clay-improved copper tailing roadbed, calculating a mixing uniformity coefficient, and comparing the mixing uniformity coefficient with a uniformity coefficient in a laboratory to evaluate the construction uniformity of the clay-improved copper tailing roadbed. According to the method, after roadbed construction is completed, a working project of measuring the compactness through a field sand filling method is combined, the mixing uniformity coefficient is calculated with the deviation between the composition proportion of roadbed filler sampled through the sand filling method and a proportion design result as a parameter, and the construction quality can be effectively evaluated conveniently.

The invention relates to the technical field of mine filling, in particular to a filling method of a mine cementing material based on a volume ratio. The method comprises the following steps: for different filling strengths, adaptively generating a filling formula through an adaptive multivariable ratio optimization algorithm, and obtaining a reference formula set; during mine filling operation, process parameters are obtained in real time, and in combination with the reference formula set, the volume ratio of the cementing material to the tailing slurry in the finished product slurry is calculated; calculating the real-time addition amount of the cementing material based on the volume ratio of the cementing material to the tailing slurry; a delay compensation and multi-dimensional optimization predictive control algorithm is introduced, the real-time addition amount of the cementing material is optimized, and the corrected addition amount of the cementing material is obtained; and based on the corrected cementing material addition amount, filling of the mine cementing material is achieved. The technical problems that in the mine filling process, control over the adding amount of the cementing material is not accurate, and self-adaption is poor are solved.

The invention relates to acid-resistant sulfate reducing bacteria and application thereof, and belongs to the technical field of microorganisms. The acid-resistant sulfate reducing bacterium disclosed by the invention is Desulfovibrio desulfuricans QY411, and is preserved in the Guangdong Microbial Culture Collection Center on March 14, 2024, and the preservation number of the acid-resistant sulfate reducing bacterium is GDMCC No: 64412. The acid-resistant sulfate reducing bacterium provided by the invention can survive in an environment with the pH value of 4, and can be applied to ecological reconstruction of acid tailings and waste dump soil, the pH values of mining wasteland soil and surface water after ecological reconstruction are remarkably increased, the concentration of SO4 < 2-> in the soil is remarkably reduced, the acidification process in the mining wasteland soil is effectively inhibited, and the acid-resistant sulfate reducing bacterium has the advantages of being safe and reliable. Therefore, the acidification process in the mining wasteland is effectively controlled. Meanwhile, soil heavy metal pollution is reduced, and vegetation growth is recovered.

The invention provides low-carbon premixed concrete based on industrial solid waste synergistic activation and a preparation method of the low-carbon premixed concrete. The low-carbon premixed concrete is prepared from the following components: a nano silicon-based anti-corrosion early strength agent, a cementing material, recycled aggregate, electric furnace tailings, waste carbon fibers, a polycarboxylate superplasticizer and water, the preparation method comprises the following steps: S1, preparing a nano silicon-based anti-corrosion early strength agent through silane hydrolysis and modification reaction of nano silicon dioxide; s2, preparing a cementing material: mixing fly ash, steel slag, mineral slag and Portland cement, calcining, grinding, spraying a composite alkali activator, and aging; s3, mixing and forming: wet-mixing the cementing material, the recycled aggregate, the iron tailing sand, the waste fibrilia, the nano silicon-based anti-corrosion early strength agent, the polycarboxylate superplasticizer and water, and pre-injecting and forming; and S4, carbonization curing. According to the invention, efficient utilization of industrial solid waste is realized, and the low-carbon environmental protection performance and mechanical property of the concrete are improved.

The invention relates to the technical field of ultra-high-performance concrete materials, in particular to a low-carbon gold tailing-based ultra-high-performance concrete material suitable for a large-gradient pavement and a preparation method of the low-carbon gold tailing-based ultra-high-performance concrete material. According to the invention, the multi-stage gold tailings and the machine-made sand are adopted to replace quartz sand in a traditional ultra-high performance concrete material, and a low-carbon cementing material prepared from a large amount of solid waste and a limited early strength activator is adopted to replace traditional high-grade cement with a large mixing amount and is cooperated with a composite admixture and steel fibers; and the low-cost and environment-friendly ultra-high performance concrete material is prepared. The ultrahigh concrete material prepared by the invention has high compressive strength, high breaking strength, high toughness and excellent freezing resistance and chloride ion permeability resistance, and also has the performance of autonomously expanding flow, thereby meeting the construction requirements of cast-in-place of ultrahigh-performance concrete in a large-gradient pavement scene.

The invention provides a treatment method for low-grade multi-metal gold concentrate, and relates to the technical field of comprehensive utilization of minerals. According to the treatment method of the low-grade multi-metal gold concentrate, most of iron and copper form iron-copper matte through pyrogenic smelting, meanwhile, gold is captured into the iron-copper matte, then iron-copper matte powder is obtained after water quenching and ball milling, the iron-copper matte powder is subjected to oxidation ammonia leaching, copper in the iron-copper matte is extracted, and the iron-copper matte powder is subjected to oxidation ammonia leaching to obtain the low-grade multi-metal gold concentrate. The obtained copper-containing ammonia leaching liquid is subjected to a traditional extraction-reverse extraction-electrodeposition process to obtain an electrodeposited copper product, ammonia leaching residues obtained after copper extraction are subjected to cyanidation leaching, gold in the ammonia leaching residues is extracted, cyanidation liquid is subjected to a traditional gold extraction process to obtain a gold product, the cyanidation tailings mainly comprise iron sulfide, the content of iron and sulfur in the tailings is high, and the content of sulfur in the tailings is high. And the subsequent cinder can be directly sold as an iron-making raw material. The amount of iron-silicon slag generated by the method is extremely low, and compared with a traditional molten pool smelting method, the comprehensive utilization rate of iron in the multi-metal gold concentrate is greatly increased.

The invention relates to the technical field of industrial solid waste resource utilization, and particularly discloses a geopolymer-based rare earth tailing curing material and a preparation method thereof, the geopolymer-based rare earth tailing curing material comprises 8%-15% of mineral powder, 20%-25% of fly ash, 20%-35% of rare earth tailings, 0.5%-3% of fiber, 0.5%-1% of nano oxide, 15%-20% of an alkaline activator and 15%-36% of water. The geopolymer-based rare earth tailing curing material provided by the invention has the advantages of excellent mechanical properties, good fluidity, appropriate curing time, environmental friendliness and the like, and is suitable for ecological restoration of mines, treatment of tailings ponds and preparation of road base materials; according to the invention, industrial wastes (such as fly ash, slag and rare earth tailings) are used, so that resource recycling is realized; the carbon emission is low in the production and use process of the material, and the sustainable development requirement is met.

The invention discloses a steel slag dry-method treatment system and a whole-process waste heat recovery process, and belongs to the technical field of steel slag treatment and waste heat recovery. According to the technical scheme, the system comprises a high-temperature section waste heat recovery system, a medium-low temperature section waste heat recovery system and a steel slag secondary separation and tailing digestion system. Firstly, steel slag discharged from a smelting furnace enters a high-temperature section waste heat recovery system, and heat is recovered by adopting a vertical waste heat recovery device through air heat exchange. Afterwards, the steel slag subjected to rolling crushing enters a medium-low temperature section waste heat recovery system, and heat of the steel slag is directly exchanged and recovered through a kiln type waste heat recovery device. And finally, iron-containing materials and tailings are separated from the steel slag through magnetic separation, and the tailings can be comprehensively utilized after being digested by digestion gas. The method has the beneficial effects that the whole-process waste heat recovery of the steel slag discharged from the smelting furnace can be realized, the resource recovery rate is improved, and the problems existing in steel slag treatment in the current steel industry are effectively solved.

The invention relates to an anorthite material and a preparation method thereof. The adopted technical proposal comprises the following steps of: according to (ZL200510019664.3) patent technology, namely a method for preparing titanium and a titanium alloy by utilizing titanium-containing furnace slag, taking molten tailings which is extracted with the titanium alloy as a raw material, adding 20 to 50 weight percent of silica, 0 to 60 weight percent of clay and 0 to 40 percent aedelforsite, and cooling a melt to obtain the anorthite material after the mixture is completely molten and a bath composition is uniform; or taking cold tailings extracted with the titanium alloy as the raw material, adding 20 to 50 weight percent of the silica, 0 to 60 weight percent of the clay and 0 to 40 percent the aedelforsite, carrying out mix grinding on the raw material and the admixture until the particle size is less than 0.1 mm, performing blank compression, and calcining the mixture at a temperature of between 1,200 and 1,400 DEG C to obtain the anorthite material. The method takes the tailings extracted with the titanium as the raw material, saves precious bauxite resources, has low cost, ensures that industrial residue is utilized with high added value, is environment-friendly and has simple process.

The invention discloses a method for producing iron powder by solid reduction treatment of copper smelting slag in a rotary kiln. Copper slag powder is obtained by crushing the copper smelting slag; carrying out solid-state reduction on the pellets containing the copper slag powder in a rotary kiln; carrying out magnetic separation on the reduced material to obtain iron powder and tailings; the pellets are fed into the rotary kiln from the tail of the rotary kiln, air is blown into the rotary kiln from a kiln head, and the reduced materials are discharged from the kiln head; the raw materials of the pellets comprise copper slag powder, limestone powder and pulverized coal. According to the method, the copper smelting slag is subjected to solid-state reduction treatment through the rotary kiln to comprehensively recover and produce the iron powder, and treatment and resource recycling of the copper smelting slag are achieved; the reduction, harmlessness and recycling of the industrial waste residues are realized, the investment is saved, the energy is saved, the consumption is reduced, the operation cost is low, and the popularization is easy.

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 a co-treatment process for high-iron red mud and various carbon-containing solid wastes. The co-treatment process comprises the working procedures of raw material preparation, ball pressing, drying and pre-reduction, iron reduction, titanium-silicon reduction, tailing treatment and the like. According to the method, the problems of low iron grade and high impurity aluminum content of a red mud iron recovery process are solved, the comprehensive utilization problem of other solid wastes and the utilization problem of tailings after extraction are synchronously realized, and the purpose of treating wastes with wastes is realized.

The invention belongs to the technical field of comprehensive utilization of industrial solid wastes, and particularly relates to a sawing mud-graphite tailing road base material as well as a preparation method and application thereof. The road base material is prepared by mixing saw mud, graphite tailings, a red mud-based cementing material, a reinforcing agent and water. The sawn mud-graphite tailing road base material is applied to a heavy traffic load road base with the strength requirement of 4.0-6.0 MPa. According to the sawing mud-graphite tailing road base material, all aggregates in a traditional road base material are jointly replaced by sawing mud-graphite tailings, and the red mud-based cementing material is adopted for curing, so that the utilization efficiency of solid waste recycling is greatly improved; and the problems of shortage of sand and gravel resources and high material cost of construction engineering in the road engineering construction process are relieved.

The invention discloses a method for asynchronously recovering copper and cobalt in sulfur-oxygen mixed copper-cobalt ore tailings through dressing and smelting combination. The sulfur-oxygen mixed copper-cobalt ore tailings are divided into a coarse fraction, a medium fraction and a fine fraction according to particle sizes; the coarse fraction is subjected to ore grinding and copper sulfide flotation, part of copper and cobalt are recycled, and coarse fraction tailings are obtained; the medium fraction is subjected to copper sulfide flotation, copper oxide flotation and magnetic separation, part of copper and cobalt are recycled, and medium fraction tailings are obtained; the fine fraction is subjected to magnetic separation, part of copper and cobalt are recycled, and fine fraction tailings are obtained; and neutralizing one or more than two of the coarse-fraction tailings, the medium-fraction tailings and the fine-fraction tailings to recover part of copper and cobalt. According to the characteristics of the sulfur-oxygen mixed copper-cobalt ore tailings, the sulfur-oxygen mixed copper-cobalt ore tailings are divided into different size fractions, and different grading processes are adopted for treatment. And efficient enrichment and recovery of copper minerals and cobalt minerals with different properties in the sulfur-oxygen mixed copper-cobalt ore tailings are realized through a multi-process combined grading process.

The invention discloses an energy storage battery box based on light high-performance concrete and a preparation method of the energy storage battery box, and belongs to the technical field of energy storage equipment. The energy storage battery box provided by the invention comprises a light high-performance concrete base body and a metal net embedded in the light high-performance concrete base body, according to the lightweight high-performance concrete matrix, a multi-component gel system composed of ordinary Portland cement, a shrinkage reducing agent, a solid waste-based geopolymer and steel slag micro powder is adopted, and solid waste-based artificial sand, fibers and a solid waste-based filling material in a specific proportion are compounded, so that a lightweight high-strength intrinsically fireproof concrete material is successfully prepared; meanwhile, a large amount of industrial solid wastes such as the desulfurized gypsum, the red mud, the steel slag tailings and the fly ash are utilized, efficient resource utilization is achieved, the raw material cost and full-life-cycle carbon emission are remarkably reduced, and the production efficiency is high.

The invention relates to the technical field of iron ore tailing resource utilization, in particular to a method for preparing iron oxide yellow by leaching iron ore tailings through an advanced oxidation technology, which comprises the following steps: adding a required amount of iron ore tailing powder into a persulfate solution, stirring to react, adding a reducing agent, boiling, filtering, adding alkali liquor to adjust the pH value, and filtering, thereby obtaining the iron oxide yellow. Pure liquid containing ferrous ions is obtained; taking part of the pure solution containing ferrous ions, and adding a potassium hydroxide solution to obtain an iron oxide yellow seed crystal solution; adding a pure solution containing ferrous ions into the iron oxide yellow seed crystal solution, adding an alkali solution to adjust the pH value, reacting, and separating and drying a product to obtain the iron oxide yellow. According to the method, the persulfate is adopted to leach iron from the iron ore tailings, and the iron oxide yellow is prepared from the leachate; harmless treatment of the iron ore tailings and value-added utilization of valuable resources are achieved, the raw material source of the iron oxide yellow industry is widened, and a wider prospect is provided for development of iron oxide yellow.

The invention discloses a fluoride-free flotation-microbiological leaching-multistage magnetic separation synergistic tailing purification process, which takes mine tailings as raw materials and is realized by the following steps: 1, fluoride-free flotation desliming and impurity removal: replacing hydrofluoric acid with a novel anion collector (fatty acid derivative), and preferentially removing mica and feldspar under the condition that the pH is 2.5-3.5; 2, removing iron and aluminum by microbiological leaching: leaching for 48 hours at the temperature of 35 DEG C by utilizing an acidophilus bacillus ferroxidans bacterial solution, and dissolving Fe2O3 and Al2O3 in a wrapped state; 3, high-gradient magnetic separation refining: removing magnetic minerals through 1.2 T strong magnetic separation, and then separating weak magnetic impurities through 0.8 T weak magnetic separation; the indexes of the final product are as follows: the purity of SiO2 is greater than or equal to 99.9%, the whiteness is greater than or equal to 94% (ISO standard), the content of Fe2O3 is less than or equal to 80ppm, Al2O3 is less than or equal to 1200ppm, and the requirements of electronic grade (IOTA-4 standard) quartz powder are met.

The invention relates to the technical field of ceramic materials, in particular to high-corrosion-resistance environment-friendly ceramic and a preparation method of the high-corrosion-resistance environment-friendly ceramic. 20 to 22 percent of Al2O3; 4 to 6 percent of Fe2O3; 2.0 to 3.5 percent of CaO; 0.5 to 1.0 percent of MgO; 0.8% to 1.2% of K2O and Na2O; sO3: less than or equal to 0.03%; pb + Cd + Cr < 6 + >: < = 2 ppm; the balance is impurities. According to the scheme, the craft ceramic can be prepared from the tailings, meanwhile, residues such as the heavy metal content are strictly controlled, components are controlled to be stable, and therefore unification of high corrosion resistance and environmental friendliness is achieved.

The invention belongs to the technical field of mine ore washing equipment, and relates to improvement of the production efficiency of an elutriation machine, in particular to an elutriation system for efficient iron ore washing and separation and a control method thereof.The elutriation system comprises a concentrate pulp mixer, an overflow groove, an elutriation barrel, a supporting platform, an ore washing water path and a control system; the concentrate pulp mixer is arranged above the elutriation barrel, the overflow groove is formed in the lower portion outside the concentrate pulp mixer and is in an inclined table shape, the tailing outlet is formed in the bottom of the inclined table, the middle of the interior of the overflow groove is connected with the elutriation barrel, a middle barrel body of the elutriation barrel is divided into an inner barrel body and an outer barrel body, and multiple sets of magnet exciting coils are arranged between the inner barrel body and the outer barrel body. The lower part of the inner cylinder is connected with an inverted-cone cylinder; a stirring impeller is arranged below the concentrate pulp mixer; the lower part of the elutriation barrel is filled with direct-flow water and rotational flow water through an ore washing water path; the system automatically recognizes working condition changes according to the ore feeding property, the material amount, field data and database set values, the optimal operation mode is selected, a magnetic field, an ore removal valve, a water supply valve and the like are controlled, efficient and intelligent separation of iron ore powder is achieved, and the optimal ore washing effect is achieved.

The invention relates to the technical field of cement-based material preparation, and particularly discloses a preparation method of an anti-carbonization all-solid waste slag-sulphoaluminate cementing material, which comprises the following steps: (1) putting a wet material formed by lead-zinc tailing powder and water into a reaction container, sealing, and heating; and mixing the obtained product with iron powder and / or iron oxide powder and water, stirring, separating out a solid product, and heating and drying in an air atmosphere to obtain the anti-carbonization tailing powder. And (2) mixing the anti-carbonization tailing powder with sulphoaluminate cement powder, and carrying out mechanical grinding treatment to obtain the modified sulphoaluminate cement. And (3) uniformly mixing blast furnace slag powder, the modified sulphoaluminate cement, fly ash, waste gypsum powder, an alkali activator, gypsum and a water reducing agent serving as raw materials to obtain the cementing material. According to the invention, the resource utilization of industrial solid waste is realized, the carbonization resistance of the cementing material is effectively improved, and the service durability of the cementing material is improved.

The invention provides an alkali-activated gel material as well as a preparation method and application thereof. The alkali-activated gel material is prepared from a composite alkali activator and a solid waste gel material, the composite alkali activator is formed by mixing water glass and NaOH, and the mass ratio of the water glass to the NaOH is 2000: (350-520); the solid waste gel material is formed by mixing iron tailing sand, limestone and fly ash, and the ratio of the total mass of the limestone and the fly ash to the mass of the iron tailing sand is (70-80): (30-40); the mass ratio of the composite alkali activator to the solid waste gel material is (0.32-0.38): 1. The alkali-activated cementing material is prepared by cooperatively treating the iron tailing sand through the limestone and the fly ash, and the alkali-activated cementing material with good mechanical properties can be prepared by regulating and controlling the mass ratio of the raw materials.

The invention discloses a deep sea rare earth mining tailing in-situ backfill type double-station alternate mine collecting system which comprises two linear guide rails installed at the bottom of a mine car body, each linear guide rail is provided with a telescopic assembly through a carrying position of the linear guide rail, and the telescopic assemblies can be horizontally moved by the linear guide rails in the direction parallel to the advancing direction. A collecting pipe capable of independently and vertically stretching out and drawing back is arranged on a movable part of the telescopic assembly, and the collecting pipe can be driven by the telescopic assembly to horizontally move in the direction perpendicular to the advancing direction. A double-station alternate mine collection mode is adopted, and the two linear guide rails and the two telescopic assemblies are arranged at the bottom of the mine car body to control the two collection pipes, so that after any collection pipe completes collection, the collection pipes can be transferred to two stations in the mining direction through cooperation of the linear guide rails and the telescopic assemblies; the two collecting pipes can achieve double-station uninterrupted alternate ore collection, and the ore collection efficiency is effectively improved.

The invention relates to the technical field of jigging magnetic flotation columns, and discloses a jigging magnetic flotation column which comprises an inner cylinder, a magnet exciting coil is fixedly connected to the periphery of the inner cylinder, and an outer cylinder is arranged on the periphery of the magnet exciting coil; a conical concentrator is fixedly connected to the bottom of the inner cylinder, and a pulsation mechanism is arranged on one side of the conical concentrator; and the inner cylinder is connected with a feeding mechanism. The technical problems that a large amount of washing water needs to be used for elutriating the magnetic separator, and the concentration of reagents is affected by adding water into a flotation column are solved, the magnetic separation method for magnetite by applying magnetic levitation is possible, the magnetic separation magnetic field intensity is synchronously and reversely adjusted, and the problems of overflow tailing black running and magnetic ore concentrate magnetic inclusion caused by jigging pulsation are solved; the accidents that the ore pulp of the flotation column runs out of the groove and overflows and the elutriation magnetic separator runs out of the groove and overflows are prevented, and the product recovery rate and the concentrate index are also improved.

The invention discloses an efficient filling method for an underground small goaf group, and the method comprises the steps: constructing a three-dimensional model through laser radar scanning, and marking a communication relation and the stability of a top plate; dividing the goaf group into a main filling area and a secondary filling area, and designing a fractal topological structure drainage channel to form a gravity flow network; preparing filling slurry taking a cementing material, tailings and the like as main materials, and controlling parameters such as slump, initial setting time and the like; then, stepped pressure self-adaptive filling is adopted, slurry is injected in two stages, and the pressure and the flow speed are controlled; according to the method, the problems that traditional filling blind areas are large in number, material waste is serious and efficiency is low are solved, low-pump-pressure global coverage is achieved, the roof contact rate is remarkably increased, safe and efficient mining of mines is guaranteed, the comprehensive cost is reduced, and the method is suitable for underground small goaf group filling.

The invention discloses lightweight energy-saving fireproof soil-based foam lightweight soil, which is prepared from the following raw materials in parts by weight: 20 to 30 parts of magnesium slag powder, 20 to 30 parts of granulated blast furnace slag powder, 15 to 25 parts of iron tailing powder, 40 parts of soil, 6 parts of water glass, 10 parts of desulfurized gypsum, 0.28 to 0.43 part of polycarboxylate superplasticizer, 57 to 75 parts of water, 0.76 to 1.00 parts of AOS foaming agent, 0.16 to 0.26 part of HPMC foam stabilizer and 0.16 to 0.26 part of calcium stearate foam stabilizer. The preparation method comprises the following steps: 1, mixing and stirring dry powder; 2, preparing slurry; 3, preparing soil-based foam light soil; and 4, molding and curing in a mold. According to the invention, a three-dimensional skeleton dense structure is constructed by optimizing the composition and proportion of the raw materials, the soil-based foam light soil with low heat conductivity, low density and high strength is obtained, and the soil-based foam light soil is suitable for the fields of roof heat preservation, wall body, roadbed filling, abutment back, foundation pit, pipeline backfilling and landscape engineering.

The invention discloses an iron tailing-based all-solid-waste clinker-free cementing material and a preparation method thereof, and belongs to the technical field of building materials. The cementing material comprises the following components in parts by weight: 30-50 parts of activated iron tailings, 10-20 parts of steel slag, 20-40 parts of mineral slag, 5-20 parts of phosphogypsum and 5-20 parts of an activating agent; a preparation method of the activated iron tailings comprises the following steps that the iron tailings and the red mud are mixed, then an alkaline solution is added, alkali-heat combined treatment is conducted for 2-6 h at the temperature of 150-230 DEG C after even mixing, and the activated iron tailings are obtained after drying. According to the method, the activity of the iron tailings and the red mud is improved through component complementation in the iron tailing activity excitation process, the dosage of NaOH in the alkali-heat excitation process is reduced, and the cementing material with high hydration activity is prepared through multi-source solid waste synergistic interaction in the clinker-free cementing material preparation process.

The invention discloses a multi-component nano inhibitor for flotation separation of high-argillaceous copper sulphide ore and application, the nano inhibitor is a nano calcium carbonate-calcium oxide-sodium humate coating body, the nano inhibitor is applied to flotation separation of the high-argillaceous copper sulphide ore, collaborative optimization of slime inhibition and copper ore selective collection is achieved, and the flotation separation efficiency of the high-argillaceous copper sulphide ore is improved. And high-quality copper sulfide concentrate and sulfur concentrate are obtained. According to the method, the high specific surface area and the surface activity of the nano particles are utilized, under the weak alkaline environment without desliming, through the simple, convenient, economical and efficient mineral processing technology and reagent combination, efficient recovery of copper, gold and sulfur in the high-argillaceous ore is achieved, the use amount of lime is greatly reduced, and the technical problem of tailing sedimentation is solved.