490 results about "Phosphorite" patented technology

The embodiment of the invention discloses a mineral resource exploration data analysis method and device based on three-dimensional space modeling. The method comprises the steps that back-flushing pushing-covering structure feature information is extracted through structure interface occurrence measurement, lithology combination analysis and structure movement trace recognition and converted into geologic structure feature parameters; stratigraphic age data and lithology distribution information are integrated, and a three-dimensional stratigraphic model is constructed with a stratigraphic superposition relation as a constraint; geophysical data are imported to extract geophysical response characteristics of stratums with different depths, and lithologic boundary correction is combined to obtain deep fracture characteristic parameters; sedimentary system division is carried out on lithofacies paleogeographic information, and deep fracture characteristic parameters are fused to establish a fracture system three-dimensional model; the multi-feature association relationship is identified, the ore body prediction model is established, the spatial data is input to obtain the three-dimensional visual prediction result of the hidden ore body spatial distribution, and the exploration efficiency and accuracy in the deep phosphorite exploration process are improved.

The invention relates to the technical field of mineral processing visual detection, and discloses a visual analysis system for detecting the grade of a phosphorite flotation froth layer. The system comprises an image acquisition and decomposition module, a parallel feature extraction module, a dynamic feature fusion module, a foam evolution analysis module and a grade decision output module. The system performs multi-scale decomposition on a foam image, extracts physical and semantic features in parallel, constructs a dynamic fusion network based on bidirectional mapping to perform iterative interaction, and generates a multi-modal feature descriptor. Therefore, self-organizing growth of a foam evolution graph is driven, an evolution track of a key foam primitive is positioned and tracked, a foam grade state vector is formed, and finally, a regulation and control decision is output in combination with external control parameters. According to the system, deep fusion of physical and semantic features and deep analysis of the foam dynamic evolution process are achieved, the accuracy and predictability of foam grade state sensing are improved, and an effective means is provided for accurate control over the flotation process.

The invention relates to the technical field of phosphoric acid production, in particular to an intelligent optimization management method for phosphoric acid production process parameters. Obtaining adaptive window ranges at different moments according to data change characteristics of the phosphoric acid concentration sequence; obtaining a phosphoric acid production benefit value according to the phosphoric acid concentration in the self-adaptive window range; obtaining a benefit reference value according to the phosphoric acid production benefit value in the historical batch production process; obtaining a benefit comparison value according to the phosphoric acid production benefit value at the current moment and a benefit reference value; judging whether the production process is adjusted according to the benefit contrast value; obtaining a parameter deviation coefficient according to the difference characteristic of the sulfuric acid concentration of the production process corresponding to the benefit reference value and the current production process; and according to the parameter deviation coefficient and the benefit contrast value, obtaining a phosphorite putting amount difference coefficient. According to the parameter deviation coefficient, the phosphorite feeding amount difference coefficient and the benefit contrast value, the sulfuric acid concentration or the phosphorite feeding amount at the current moment is iteratively adjusted, and the quality of the phosphoric acid production process is improved.

The invention relates to the field of environment, phosphorite resource utilization and agricultural biotechnology, in particular to a phosphate ore-containing phosphate-solubilizing bacterial agent, a preparation method thereof, a biological bacterial fertilizer and application, the phosphate ore-containing phosphate-solubilizing bacterial agent comprises phosphate-solubilizing bacteria, hydroxyapatite and a culture medium, and the phosphate-solubilizing bacteria are enterobacter hormaechei HS-6. The hydroxyapatite is used for preparing the phosphate ore-containing phosphate-solubilizing bacterial agent, so that the phosphate ore resource can be greatly promoted to be fully utilized, and the dissolution of insoluble phosphorus in the phosphate ore is realized. According to the phosphate-containing ore phosphate-solubilizing bacterial agent, the enterobacter hormaechei HS-6 is combined with the hydroxyapatite, so that the phosphate-solubilizing capacity of the enterobacter hormaechei HS-6 can be utilized, and the phosphorus resource of the hydroxyapatite can be fully utilized. The phosphate-containing ore phosphate-solubilizing bacterial agent has good prospects in application to preparation of biological bacterial fertilizer, application to agricultural soil improvement, application to phosphate ore resource recovery and application to promotion of wheat growth.

The utility model relates to the technical field of phosphorite processing equipment, in particular to a phosphorite flotation system for producing multi-quality phosphate concentrate, which comprises a ball mill, the output end of the ball mill is connected with a first flotation column, one side of the top of the first flotation column is connected with a flotation machine, and one side of the bottom of the first flotation column is connected with a concentrate thickener. The bottom of one side of the flotation machine is connected with a reverse sweeping conveying pipe, the other side of the bottom of the first flotation column is connected with a buffering groove, and an ore pulp pump is installed at the output end of the buffering groove. According to the phosphorite flotation system for producing the multi-quality phosphate concentrates, equipment such as the ball mill, the flotation column, the flotation machine, the concentrate thickener, the buffer tank, the ore pulp pump and the swirler is creatively integrated, the technological process is optimized, and the target of producing the multi-quality phosphate concentrates on line is achieved. The system not only improves the comprehensive utilization rate of phosphorite resources, but also remarkably enhances the flexibility and diversity of production, and meets the requirements of the market on differentiated and high-quality phosphorus chemical products.

The invention discloses a deep niobium phosphate ore positioning physical and chemical exploration method based on multi-method cooperation, and belongs to the technical field of geological mineral exploration. According to the method, a three-stage exploration system of region optimization, target region delineation and fine verification is constructed, multi-parameter cooperation of a magnetic method, an electromagnetic method, an induced polarization method, a three-component magnetic logging method and a geochemical method is combined, and each step is constrained by a basic rock-niobium phosphorite metallogenic model. An ore prospecting mark is determined through regional geological background analysis and metallogenic model construction, a metallogenic prospective region is delineated through regional optimization, a specific target region is delineated and locked, engineering verification is carried out through fine verification, and finally, a result is integrated to estimate the resource quantity. According to the method, the multiplicity of solutions of a single method is effectively reduced, the positioning precision of the deep niobium phosphorite is improved, the exploration efficiency and the target area ore finding rate are improved, and the method is suitable for accurate exploration of the deep niobium phosphorite.

The invention relates to the field of solid waste resource utilization, and discloses a phosphate tailing filling material and application thereof, the phosphate tailing filling material comprises phosphorite tailings and a consolidation agent which are independently preserved or preserved in a mixed manner; the weight ratio of the consolidation agent to the phosphorite tailings is 1: (6-10); the pH value of the phosphorite tailings is 4-6 under the condition that the mass ratio of the phosphorite tailings to the water is 2: 1; the fineness of the phosphorite tailings ranges from 100 meshes to 200 meshes; based on the total weight of the consolidation agent as 100 parts, the consolidation agent contains 40-80 parts of a first precursor material, 0-20 parts of a second precursor material, 5-20 parts of a sulfate material, 0-11 parts of an early strength agent and 1-12 parts of an exciting agent. The phosphate tailing filling material provided by the invention is excellent in early strength and later strength performance, the used raw materials are wide and easy to obtain, a large amount of industrial solid waste can be consumed, and the phosphate tailing filling material has good economical efficiency.

The invention relates to the technical field of mineral resource recovery and environment-friendly beneficiation, and discloses a method for recovering phosphorite from micro-fine fraction tailings, which comprises the following steps: grading by a cyclone: micro-fine fraction ore pulp is introduced into the cyclone for grading, an overflow product enters an overflow pipe, and a sand setting product enters a subsequent desulfurization flotation process; carrying out copper-sulfur separation flotation: carrying out dehydration treatment on the crude copper concentrate obtained after desulfurization, and then entering a copper-sulfur separation flotation process to separate out copper fine powder and sulfur fine powder; the desulfurized minerals enter the micro-fine particle grade phosphorus selection process, the flotation process of one-roughing, one-sweeping and four-concentrating is adopted, and phosphorus concentrate is selected. According to the method, high-efficiency purification of copper and sulfur concentrates is achieved and tailing pollution is reduced through concentration classification of a cyclone, impurity removal of an inclined plate, desulfurization flotation and copper-sulfur separation flotation, in the phosphorite recycling process, the flotation process of one-time roughing, one-time sweeping and four-time concentration is adopted, automatic control equipment is arranged, and the recycling rate and purity of the phosphate concentrates are remarkably improved.

The invention relates to a phosphorite wet processing method, and belongs to the technical field of chemical engineering. The phosphorite wet processing method comprises the following steps: A, phosphorite acid leaching: carrying out acidolysis leaching on a phosphorite raw material, and carrying out solid-liquid separation to obtain wet-process phosphoric acid; b, removing metal ions from wet-process phosphoric acid; and C, wet-process phosphoric acid defluorination: extracting fluosilicic acid in wet-process phosphoric acid at 10-70 DEG C by adopting a wet-process phosphoric acid defluorination extraction agent, and carrying out phase splitting to obtain defluorinated purified phosphoric acid and an organic phase loaded with fluosilicate. According to the invention, high-value utilization of low-grade phosphorite resources is realized. According to the method, impurities can be fully removed, the loss rate of phosphoric acid is low, the purity of the finally obtained phosphate product reaches 97% or above, the product quality is high, and the requirements of different fields for high-quality phosphate can be met. The method is simple in process, low in energy consumption and low in cost.

The present application belongs to the field of phosphate mining, and particularly relates to a method for mining a steeply inclined phosphate deposit without leaving a top and bottom pillar; the method comprises the following steps: dividing the phosphate layer in a mining section into several stages from bottom to top along the inclination, constructing a stage transport main in the lower part of each stage, and using the stage transport main of the previous stage as the stage auxiliary transport main of the next stage without leaving a bottom pillar and a top pillar; constructing an air return crosscut in the upper part of the uppermost stage from the air shaft, and then excavating an air return shaft from the air return crosscut downward along the inclination of the phosphate layer to connect with the stage auxiliary transport main and the stage transport main; arranging strip blocks along the strike on both wings of the stage to perform skip mining, first mining the odd strip blocks and filling them, and then mining the even strip blocks, the size of the strip blocks being determined according to the strength of the roof and floor, and no inter-pillar being left between the strip blocks; and thus mining all the stages from bottom to top. The present application greatly reduces the leaving of pillars and improves the resource recovery rate of one stoping.

The present invention provides a process for removing impurities from medium- and low-grade collophosphite, which first performs reverse flotation to remove magnesium after grinding, then performs gravity separation, and finally performs reverse flotation to remove silicon to obtain phosphate concentrate. After the powder ore is ground and heated, dolomite is preferentially removed by reverse flotation, reducing the content of fine and micro-grained gangue minerals entering gravity separation, improving the efficiency of spiral chute gravity separation to remove fine-grained iron-aluminum-silicate impurities, greatly reducing the content of fine-grained impurities entering the reverse flotation desiliconization process, greatly reducing the adverse effects of fine and micro-grained particles on reverse flotation desiliconization of cationic collectors, greatly exerting the desiliconization efficiency of cationic collectors, significantly improving flotation efficiency, and finally significantly reducing the content of aluminum, magnesium, and silicate in the phosphate concentrate.

The present application belongs to the field of phosphorite deposit mining technology, and particularly relates to a method for recovering a phosphorite layer bottom pillar under a filling body, which comprises arranging a segmented transport roadway in a sandwich in the top and bottom surface of the bottom pillar to reduce the construction engineering quantity of the rock drilling roadway and the ore roadway; first constructing a filling roadway intersecting on both sides of the segmented transport roadway, filling the filling body roadway with high-strength filling material, and then constructing the segmented transport roadway in the filling roadway, so that the segmented transport roadway is finally topped and bottomed with the sandwich rock, and both sides of the segmented transport roadway are high-strength filling bodies, which greatly improves the strength of the segmented transport roadway and reduces the influence of ore mining. Further, the present application proposes an invention point of leaving a permanent ore pillar in the ore body on one side of the sandwich bottom plate to improve the safety of the segmented transport roadway and the ore room mining; in order to further improve the safety of the ore room mining, the present application first proposes an ore room adopting an eight-character-shaped stope structure.

The invention discloses a ternary solid waste gelling system mine cemented filling material, a preparation method and application, phosphogypsum and water-quenched slag powder are used as main gelling components, carbide slag is used as an exciting agent, and phosphate tailings and phosphorus tail mud are used as filling body aggregate to form the high-content phosphogypsum ternary solid waste gelling system mine cemented filling material. Wherein the ternary solid waste gel system comprises the following components in percentage by weight: 10-18% of carbide slag, 36-54% of ardealite and 36-54% of water-quenched slag powder, and the ratio of ardealite / (ardealite + water-quenched slag powder) is 0.4-0.6. The mine cemented filling material disclosed by the invention is prepared by taking solid wastes of industrial byproducts of a phosphorite mountain and the periphery of the phosphorite mountain as main raw materials, and the mechanical property of the prepared filling slurry after solidification needs to meet an engineering filling strength index, so that efficient resource utilization of a large amount of industrial solid wastes for phosphorite resource development can be realized; good mechanical properties and remarkable economic and environmental benefits are achieved.

The invention relates to a high-temperature acidolysis reaction defluorination method, and belongs to the technical field of phosphorus chemical resource recycling. The technical problem to be solved by the invention is to provide a high-temperature acidolysis reaction defluorination method which is simple to operate and high in defluorination rate. According to the method, phosphorite powder / white fertilizer is subjected to high-temperature acidolysis, fluoride in the phosphorite powder / white fertilizer reacts with strong acid, fluorine is separated from a reaction system in a gas form, and hydrofluoric acid is obtained through condensation. The method is simple, is simple and convenient to operate, and is easy to realize technologized large-scale production. Meanwhile, due to the destructive effect of the strong acid on the lattice structure of the phosphorus-calcium compound, citrate-soluble phosphorus can be converted into soluble phosphate, subsequent phosphorus recovery is facilitated, comprehensive utilization of phosphorite and elimination of white fertilizer output are achieved, meanwhile, the problems of material accumulation and resource waste of enterprises are solved, and the method conforms to the circular economy concept of green development.

The invention discloses artificial soil based on manganese slag, red mud and ardealite. The artificial soil is mainly prepared from a manganese slag-red mud-ardealite mixed matrix and a modifier, the weight ratio of the manganese slag to the red mud to the ardealite in the manganese slag-red mud-ardealite mixed matrix is (0.4-1.6): (0.1-0.5): (0.5-0.9); the modifier comprises calcium oxide, and further comprises rice straw, biochar, zeolite or a combination thereof, and the modifier accounts for 1-15% of the weight of the artificial soil. Accordingly, a corresponding preparation method is also established. According to the method, the three solid wastes are mixed according to the characteristics, so that specific pollutants such as ammonia nitrogen, phosphorus, fluorine and Mn < 2 + > can be fixed, the reduction of heavy metals is realized, the nutrients beneficial to plant growth are reserved, the artificial soil with rich nutrients is synchronously reconstructed, the qualitative change from waste residues to resources is realized, the process is simple, and the effect is good. The obtained artificial soil can be used for greening planting, supplementing manganese ore, aluminum ore and phosphorite surrounding soil deficiency areas, and solving the problems of no soil, ploughability and ecological restoration of mining areas.

The invention discloses a potassium-containing phosphorite mineral-based soil conditioner and a preparation method thereof.The preparation method comprises the steps that firstly, potassium-containing phosphorite is smashed and sieved, then the potassium-containing phosphorite, an alkali roasting agent and an activating auxiliary are mixed in proportion, water is added for full stirring, then calcination is conducted, roasted clinker is obtained, the roasted clinker is cooled and smashed, and the soil conditioner is obtained. According to the technical scheme, the potassium-containing phosphorite is subjected to alkali roasting to prepare the soil conditioner for the first time, dissolution of soluble potassium is promoted through an alkali roasting agent and an activating auxiliary agent, and loose and porous filter residues which contain citric potassium, phosphorus, silicon and calcium and are high in water absorption and slow in ion release are generated and used as the soil conditioner; the preparation process of the soil conditioner has the advantages of simplicity in operation, low reaction temperature, less pollution, low requirements on equipment and the like, realizes pollution-free and zero-emission high-added-value comprehensive utilization of potassium-containing phosphorite resources, and has a good industrial application prospect.

The invention discloses a green mixed crystallization dihydrate wet-process phosphoric acid production process, which at least comprises a reaction process and a filtration process, in the reaction process, phosphoric ore pulp prepared from raw material phosphorite, sulfuric acid and returned acid from the filtration process are added into circulating slurry in multi-grid reaction tanks connected in series for reaction to obtain reaction slurry, and the reaction slurry is filtered by the filtration process to obtain the green mixed crystallization dihydrate wet-process phosphoric acid. One part of the reaction slurry discharged from the last grid of the reaction tank is fed into a plurality of grids of digestion tanks which are connected in series to eliminate supersaturation, and then is fed into a subsequent filtering process, and the rest part of the reaction slurry is fed back into the first grid of the reaction tank as circulating slurry, and the reaction process is divided into two stages, by controlling the ion product Q of Ca < 2 + > and SO4 < 2-> in the reaction slurry and eliminating the degree of supersaturation, the adding opportunity and the adding amount of the phosphoric ore slurry and the sulfuric acid can be well controlled, and the product quality is well improved while the consumption of the sulfuric acid is reduced.

The present invention belongs to the technical field of phosphate ore beneficiation and relates to a large-scale process method for a siliceous-calcareous phosphate ore spiral chute. Specifically, it includes: (1) Raw ore desliming: The raw ore is deslimed, and the deslimed raw ore enters the next step; (2) Classification and gravity separation: The deslimed raw ore is classified into several relatively narrower particle sizes according to certain conditions, and the products of each particle size are respectively subjected to gravity separation using a chute (with a diameter greater than 1200 mm). The concentrates and tailings after gravity separation of the products of each particle size are respectively combined into gravity separation concentrates and gravity separation tailings; (3) Flotation of gravity separation products. The present invention adds desliming and classification and gravity separation operations, which can effectively reduce the problem of entrainment of fine particle sizes in each strip in the chute (with a diameter greater than 1200 mm) and the problem of poor separation accuracy of the chute (with a diameter greater than 1200 mm) caused by equal-settling particles, improve the grade difference between the concentrates and tailings separated by the chute (with a diameter greater than 1200 mm), enhance the adaptability of the reagents in the subsequent flotation process, and improve the fluidity of the flotation foam.

The invention belongs to the field of phosphorite flotation, and particularly relates to a reagent and a method for removing potassium feldspar in collophanite and reducing the potassium content through step-by-step flotation, the removal of the potassium feldspar in the collophanite is realized through two-stage ore grinding and fine column machine-combined step-by-step flotation, namely, for fine-fraction mineral particles, firstly, a dispersing agent is adopted for fully dispersing the mineral particles, and then the fine-fraction mineral particles are added into the dispersing agent; then a collecting agent with high selectivity is added, meanwhile, a filling type microbubble countercurrent contact type flotation column is adopted to reduce the bubble size, the collision probability of the micro-fine-particle potassium feldspar and the bubbles is increased, and efficient flotation of the micro-fine-particle potassium feldspar is achieved; the foam phenomenon deterioration caused by excessive grinding is avoided through second-stage ore grinding; for roughing concentrate pulp, an improved compound collecting agent is added, the flotation froth stability is improved, and the collecting performance is enhanced; the ultrasonic device is additionally arranged, foam can be efficiently crushed, ore pulp transfer is facilitated, potassium feldspar in collophanite can be fully removed, the flotation process is stable, simple and convenient, and phosphorite resources are efficiently recycled.

The invention discloses a beneficiation method of high-quality phosphoric ore pulp for producing hemihydrate-dihydrate phosphoric acid, and relates to the technical field of phosphorite beneficiation. The method comprises the following steps: primarily crushing medium-low-grade collophanite, grinding and grading to obtain flotation pulp; after sulfuric acid and a reverse flotation collecting agent are added into flotation pulp for pulp mixing and mineralization, the flotation pulp is pumped into a roughing flotation column for roughing, and roughing concentrate is obtained; the roughing concentrate is subjected to size mixing and pumped into a cyclone set to be subjected to cyclone classification, and sand setting ore pulp with sesquioxide reduced is obtained; carrying out size mixing on the sand setting ore pulp, and pumping the ore pulp into a fine flotation column to obtain fine phosphoric ore pulp; concentrating the concentrated ore pulp through a thickener, pressurizing and filtering, and supplying the concentrated ore pulp to a semi-hydrated-dihydrated phosphoric acid device for use. A flotation column is adopted for roughing, part of sesquioxide in the phosphoric ore pulp is removed through low-pressure rotational flow grading, deep magnesium removal is conducted through a fine selection technology, magnesium oxide in the ore pulp is further reduced, and the phosphoric ore pulp meeting the production requirement of the semi-hydrate-dihydrate phosphoric acid technology is obtained through concentration and filter pressing dehydration of a thickener.

The invention discloses a phosphoric acid production process which comprises the following steps: S1, mixing phosphoric acid and phosphorite in a reactor for reaction, and filtering and washing reaction liquid to obtain monocalcium phosphate filtrate; s2, the monocalcium phosphate filtrate enters a bipolar membrane electrodialyzer, the bipolar membrane electrodialyzer is formed by sequentially arranging a cation exchange membrane, an anion exchange membrane and a bipolar membrane, and an acid chamber, a salt chamber and an alkali chamber are formed respectively; the monocalcium phosphate is converted into phosphoric acid and calcium hydroxide under the action of the electrodialyzer. According to the method, phosphoric acid with relatively high purity can be directly prepared, and phosphogypsum is not generated. Compared with the traditional wet-process phosphoric acid, the produced solid waste amount is sharply reduced and is about one tenth to one twentieth of that of the traditional wet-process phosphoric acid, and the phosphoric acid is rich in silicon, magnesium, iron and the like and can be used as a fertilizer additive.

The invention discloses a method for smelting yellow phosphorus and alloy by using high-magnesium low-grade phosphorite, which comprises the following steps of: proportioning the high-magnesium low-grade phosphorite, a calcium flux, a siliceous flux, iron ore and a carbonaceous reducing agent, and carrying out reduction smelting treatment, so that part of apatite is reduced to generate yellow phosphorus steam, and part of phosphorus steam and reduced iron are chemically combined to form the alloy; calcium oxide, magnesium oxide, silicon oxide and aluminum oxide form low-melting-point smelting slag, and activated slag is obtained through water quenching. The method can provide technical reference for efficient resource utilization of low-grade phosphorite, especially high-magnesium and high-iron type low-grade phosphorite, three products of high-quality yellow phosphorus, high-added-value ferrophosphorus and activated smelting slag are obtained at the same time, and no new solid waste is generated in the process.

The invention discloses a phosphorus slag field percolate concentrated water evaporative crystallization desalting system which comprises a filtering mechanism, an evaporation mechanism is installed at the lower end of the filtering mechanism, a crystallizer is installed at the lower end of the evaporation mechanism, the filtering mechanism comprises a filtering box and a filtering plate, a liquid inlet pipe is installed at the upper end of the filtering box, and a conveying pipe is installed at the lower end of the filtering box. A plurality of filtering plates are arranged in the filtering box, the diameters of filtering holes of the filtering plates are different, the left ends of the filtering plates penetrate through the filtering box, sealing plates are installed at the right ends of the filtering plates, a matching plate is installed at the left end of the filtering box, and clamping mechanisms are symmetrically installed at the left end of the matching plate. The filtering plate with the corresponding filtering hole diameter can be selected according to the filtering requirement, the percolate concentrated water is stirred through the stirring plate, and the heating evaporation efficiency of the percolate concentrated water is improved; meanwhile, heat exchange is conducted in the annular cavity through the spiral heat exchange pipe, the temperature of the outer surface of the evaporation box is increased, the heat preservation effect of the evaporation box is improved, and heat loss of the evaporation box is reduced.

The invention provides a precise separation method for high-power and half-high-silica phosphorite. The precise separation method comprises the steps of photoelectric separation pretreatment, selective crushing, ore grinding, screening and targeted flotation. The method comprises the following steps: carrying out photoelectric separation on high-power and half-high siliceous phosphorite to obtain photoelectric separation concentrates and photoelectric separation tailings, carrying out selective ore grinding on the photoelectric separation concentrates, and screening the particle sizes of ore grinding products to distinguish mineral products with different particle size distributions and impurity components. And finally, precise separation and enrichment of the high-power and half-high siliceous phosphorite are realized through targeted flotation. Multi-section double reverse flotation is adopted, and collaborative separation of multiple elements such as magnesium, silicon, iron and aluminum is achieved. Compared with a conventional double-reverse flotation process, the process has the advantages that mineralogical ore properties and the process flow are coupled, so that the flotation process has selectivity; the precise separation method provided by the invention has the advantages of stable beneficiation process flow, good separation effect, high concentrate recovery rate, high phosphate concentrate grade, low content of iron and aluminum sesquioxide in concentrate products and the like.

The invention discloses a phosphorite mining method which comprises the following steps: constructing and cutting an uphill along a top plate of an ore body from a lower layered gate way to an upper layered gate way, and supporting by adopting a resin anchor rod, a reinforcing mesh and a mining anchor cable; cutting groove construction is conducted, medium-length holes are formed in the lower layered gate way, explosives are loaded in the medium-length holes to conduct blasting layer by layer, a cut uphill bottom plate is continuously lowered till an ore body bottom plate is reached, and the cutting grooves are formed; fan-shaped medium-length holes are constructed in the lower layered gate way, a plurality of rows of fan-shaped medium-length holes are formed in the vertical direction, a plurality of holes are formed in each row of fan-shaped medium-length holes in the vertical direction, blasting is conducted with the cutting groove as a vertical free face, and the fan-shaped medium-length holes are blasted in batches; and charging powder in the lower layered roadway, and after blasting, entering a stope by adopting a remote control forklift for ore removal. The vertical free surface blasting technology is adopted for blasting the medium-length holes in batches, and the method has the advantages that the top plate operation safety is improved, the mining period is shortened, and the ore recovery rate is increased.

The invention discloses a collophanite gravity-flotation combined beneficiation backwater utilization method, which comprises the following steps: carrying out ore grinding and grading on collophanite, introducing into a reverse flotation magnesium removal process to obtain magnesium removal concentrate a and magnesium removal tailings b, carrying out gravity concentration on the magnesium removal concentrate a to obtain gravity concentration concentrate c and gravity concentration tailings d, and carrying out gravity concentration reverse flotation dealumination process on the gravity concentration concentrate c to obtain phosphate concentrate e and tailings f; and the direct utilization of the backwater refers to collecting the magnesium-removed tailings b, the phosphate concentrate e, the tailings f and the phosphate concentrate g, respectively thickening and filtering to obtain the backwater, feeding the backwater into a No.1 backwater pool, and directly returning the backwater to the processes of ore grinding, reverse flotation magnesium removal, reselection, reconcentration and reverse flotation dealumination for reuse. According to the method for utilizing the collophanite gravity-flotation combined mineral separation backwater, a process capable of reducing the treatment and utilization amount in the utilization of the separation backwater of the collophanite and impurities magnesium and aluminum contained in the collophanite is found, so that the backwater recycling in the whole process is realized, and the separation index of removing the impurities magnesium and aluminum from the collophanite is not influenced.

The present application belongs to the field of phosphate ore filling mining, and particularly relates to a phosphate ore deposit bottom pillar and ore block coordinated stage empty field subsequent filling mining method, which comprises the following steps: dividing the ore bed into a plurality of ore blocks along the strike of the ore bed, wherein the ore block comprises an ore room and a bottom pillar; constructing a roadway for transportation and ventilation; first mining the ore bed with a smaller rock mass strength coefficient and filling; retaining or blasting the interlayer; mining the ore bed with a larger rock mass strength coefficient and filling; and mining the ore bed in the bottom pillar of the previous middle section. The present application does not need to fill the empty area formed by the bottom pillar recovery, can reduce the filling process and filling material, reduce the filling cost and construction process, and improve the mining efficiency. The present application can realize the full mining of the ore bed, does not leave the top pillar, and recovers the bottom pillar without filling, so that the ore recovery rate is close to 100%, and good economic benefits can be achieved.

The invention discloses a method for recovering valuable elements in phosphorite step by step through gradient acid leaching, which comprises the following steps: firstly, mixing high-magnesium phosphorite and high-silicon phosphorite in proportion for ore blending, and carrying out crushing, grading and ball milling until the particle size is less than or equal to 200 meshes; then, adopting a gradient acid leaching process: (1) leaching with low-concentration inorganic acid (1-3wt%), and preferentially and selectively removing dolomite and calcite to obtain phosphate concentrate and leachate rich in calcium and magnesium; (2) leaching the phosphate concentrate by using medium-concentration inorganic acid (5-8wt%), and dissolving the phosphate concentrate to obtain a phosphate concentrate leachate and residues mainly containing iron, aluminum and silicon; and (3) leaching the residues by using high-concentration inorganic acid (30-40wt%) to obtain silicon-rich residues and a leaching solution rich in iron and aluminum. (4) neutralizing and carbonizing the calcium-magnesium leaching solution, and respectively precipitating and recovering magnesium hydroxide and calcium carbonate; (5) carrying out fractional precipitation on the phosphate concentrate leachate to obtain rare earth enrichment and calcium hydrogen phosphate; (6) carrying out alkali dissolution and carbonization reaction on the silicon-rich slag to prepare high-purity white carbon black; and (7) carrying out iron powder reduction, neutralization aluminum removal and oxidation iron precipitation on the iron and aluminum lixivium to prepare the battery-grade iron phosphate. The method is simple and convenient to operate, energy-saving and environment-friendly, various valuable elements in the phosphorite are efficiently recycled, and the economic added value of phosphorite resources is increased.

The invention discloses a long-acting stable filling agent for phosphorite mining and a preparation method and application thereof, the long-acting stable filling agent takes cement, slag powder, phosphogypsum and fly ash as matrix components, and is supplemented with additives such as a nano modified liquid, a retarder and an early strength agent. The 3d compressive strength reaches 4.6-5.5 MPa, the 28d compressive strength reaches 13.5-15.5 MPa, the 90d strength retention rate in a simulated acid environment is larger than or equal to 84%, the volume shrinkage rate is smaller than or equal to 0.5%, and the early strength and the excellent long-term acid-resistant stability are both high. Through a synergistic effect of a nano-micron composite structure, pores are filled with nano particles and secondary hydration is promoted, basalt fibers are bridged to resist cracking, and nano montmorillonite blocks acid etching, so that unification of high early strength and long-acting acid resistance is realized. The material is simple and convenient in preparation process, can be efficiently used for mining and filling of phosphorite mountains, and meets the requirements of rapid support and long-term acid medium erosion resistance.

The invention belongs to the technical field of phosphorite beneficiation, and particularly discloses a method for improving silicon-calcium collophanite double-reverse flotation froth, which comprises the following steps: adjusting the pH value of phosphorite pulp to be acidic by using oxalic acid, adding a magnesium removal collecting agent for reverse flotation magnesium removal to obtain magnesium-removed concentrate pulp, adding activated carbon into the magnesium-removed concentrate pulp, uniformly mixing, diluting the ore pulp, adjusting the pH value to be 6.5-8, and filtering to obtain the silicon-calcium collophanite double-reverse flotation froth. Adding the foam-inhibiting agent and uniformly mixing; and a cation collecting agent is added for dealumination and desiliconization reverse flotation, and ore pulp obtained after reverse flotation is subjected to solid-liquid separation, so that phosphate concentrate is obtained. According to the method provided by the invention, the pH is adjusted by adopting oxalic acid during reverse flotation magnesium removal, activated carbon is added into ore pulp after magnesium removal to mix an adsorption agent, and a foam inhibition agent is added; the physical and chemical properties of the surface of the foam can be changed, the half-life period of the foam is greatly shortened, and the beneficiation effect is ensured.