153 results about "Mineral flotation" patented technology

The invention belongs to the technical field of oil-gas-water separation equipment, and discloses an ultrasonic detonation rotational flow microbubble flotation device which comprises a vertical container tank with inner and outer stepped double-barrel design and a separation inner barrel, an oil gathering umbrella is arranged on the upper portion of the interior, an oil discharge connector is arranged on the outer wall of one side, and surrounding physical demulsification coalescence filler is arranged on the upper portion of the area between the tank and the inner barrel. And the lower part of the separation inner cylinder is provided with a reverse symmetrical double-tangential rotational flow inlet, the bottom of the separation inner cylinder is externally provided with a purified backflow water inlet and is communicated with the purified water diversion outlet in a process manner, and the bottom of the separation inner cylinder is internally provided with a gas-water mixer and an ultrasonic knocker. By combining ultrasonic cavitation, rotational flow centrifugation, micro-nano bubbles and physical coalescence demulsification technologies, the diameter of the bubbles is reduced by 15 microns or below through the ultrasonic detonation cavitation effect, fine oil drops and suspended particles which are difficult to treat through traditional flotation and are 10 microns or below can be captured, the method is suitable for multi-phase separation of discrete high-concentration fine pollutants, and the flotation efficiency is improved. Complex separation scenes such as oily sewage, micro-plastics and mineral flotation can be treated.

The invention discloses a flotation froth image feature extraction method based on adaptive multi-scale weighted fusion, and belongs to the technical field of intelligent monitoring and image processing in the mineral flotation process, and the method comprises the steps: fusing a color histogram, texture and edge features, and depth features extracted by VGGNet, GoogLeNet and ResNet; and mapping and fusion of multi-modal features are realized by using a self-adaptive multi-scale weighted feature fusion network. And dynamic weighting and fusion are carried out on different characteristic modes through a nonlinear neural network model, and unified characteristic representation is generated to be used for accurate representation of the flotation froth state. The method has the advantages of high recognition precision, high robustness and flexible deployment, online monitoring, optimal control and index prediction of the flotation process can be effectively supported, and reliable technical support is provided for an industrial field.

The invention relates to the technical field of mineralogy, and provides a prediction method for mineral flotation yield. According to the method, the content and dissociation degree of the target minerals under different size fractions are accurately obtained through the technologies of ore grinding, system screening and automatic mineralogy analysis, the yield prediction method based on the mineral selectability physical model is established, the crossing from elements to minerals and from the whole to the size fractions can be achieved, and the yield prediction accuracy is improved. And a brand-new, scientific and reliable technical reference is provided for precise prediction and process optimization of the sulfide ore flotation yield.

The invention provides a collecting agent for micro-fine particle quartz ore and a preparation method and application of the collecting agent, and relates to the technical field of mineral flotation. Specifically, the preparation method of the collecting agent comprises the steps that a mixture containing the graphene and the sodium oleate is subjected to cold plasma treatment, and the graphene and the sodium oleate are grafted to obtain the collecting agent. The collecting agent can be used for mineral flotation, and high-purity quartz can be efficiently obtained; on the basis of the net capturing performance of graphene and functional groups corresponding to grafted sodium oleate, the flocculation effect on micro-fine quartz is achieved, so that the quartz is efficiently captured, the problem that the fine quartz is free in ore pulp due to large free energy in the flotation process and is difficult to capture and float is solved, the flotation separation efficiency is improved, the separation index is improved, and the flotation cost is reduced. Good application prospects are realized.

The invention belongs to the technical field of mineral flotation, and particularly relates to a nanocellulose-based coal slime collecting agent and a preparation method and application thereof. Wet-grinding the dried absorbent cotton, drying again, acidizing, filtering, washing and centrifugally drying to obtain precursor cellulose; dissolving the precursor cellulose in deionized water, adjusting the pH value to 10, adding an ethanol solution of alkyltriethoxysilane, heating, stirring for reaction, naturally cooling, centrifuging, washing and drying to obtain hydrophobic nano cellulose; and the hydrophobic nanocellulose and the non-polar hydrocarbon oil are evenly mixed, and the coal slime collecting agent is obtained. The prepared coal slime collecting agent contains the hydrophobic nanocellulose which is high in softness and has a net-shaped structure, in the flotation process, adhesion of bubbles and minerals can be promoted, diffusion of the bubbles is promoted, and the flotation efficiency and the recovery rate are improved.

The invention belongs to the technical field of mineral flotation, and particularly discloses a xanthate collecting agent and a preparation method and application thereof, and the xanthate collecting agent is obtained by taking ether alcohol, carbon disulfide and caustic alkali as raw materials to react; the xanthate collecting agent is selected from at least one of formulas I-VI. The xanthate collecting agent has the advantages of being free of peculiar smell, easy to degrade, high in yield, high in purity, efficient in mineral flotation and the like, the working environment of the xanthate collecting agent in the production and using process can be effectively improved, operation is easy and convenient, cost is low, and industrial production is easy to achieve.

The invention discloses an efficient mineral selective flotation reagent and application thereof, and aims to improve the selectivity and recovery rate of mineral flotation. The composition comprises a first precursor (P1), a second precursor (P2), and a resonance activation adjuvant (Aux). The first precursor P1 has an anchoring group capable of acting on the surface of a target mineral and a first reactive functional group; the second precursor P2 includes a hydrophobic group and a second reactive functional group capable of a ligation reaction with the first reactive functional group of P1. The application method comprises the following steps: adding P1 and Aux into ore pulp to react with minerals; and applying an external energy field (such as ultrasonic wave or illumination with specific wavelength) to activate P1 and Aux adsorbed on the surface of the mineral. Through an in-situ interface reaction strategy assisted by an external energy field, directional adsorption and effective coverage of the agent on the surface of the mineral are remarkably improved, flotation dynamics is improved, flotation requirements of different mineral types can be met, and a new technical approach is provided for efficient utilization of complex and refractory ores.

The invention belongs to the technical field of mineral flotation, and particularly relates to a cellulose-based coal slime collecting agent and a preparation method and application thereof. The method comprises the following steps: performing wet grinding on recycled waste paper to obtain a paper pulp solution, stirring until paper pulp fibers are uniformly dispersed, adding excessive lithium chloride and sodium periodate, performing stirring reaction, cleaning and centrifuging to obtain precursor cellulose, performing amino alkylation modification to obtain amino alkyl cellulose, preparing the amino alkyl cellulose into a 20 g / L solution, and performing vacuum drying to obtain the lithium ion battery cathode material. And then uniformly mixing with non-polar hydrocarbon oil according to the volume ratio of 1: 2 to obtain the coal slime collecting agent. The prepared coal slime collecting agent contains the hydrophobic nanocellulose with the large length-diameter ratio, in the flotation process, adhesion of bubbles and minerals can be promoted, diffusion of the bubbles is promoted, and the flotation efficiency and the recovery rate are improved.

The invention discloses a low-temperature-resistant spodumene flotation collector as well as a preparation method and application thereof, and relates to the technical field of mineral flotation. The flotation collecting agent is prepared from the following raw materials in percentage by mass: 60%-80% of an anionic fatty acid collecting agent, 5%-20% of a sulfonate auxiliary collecting agent, 5%-15% of a hydroximic acid auxiliary collecting agent and 3%-15% of a nonionic surfactant. The flotation collecting agent still has excellent collecting performance and selectivity under the low-temperature condition of 6 DEG C, the problem that the low-temperature activity of a conventional flotation collecting agent is suddenly reduced is effectively solved, pre-desliming or calcium chloride activation is not needed when the flotation collecting agent is used, the process is simple, the cost is low, and the flotation collecting agent is suitable for industrial flotation of spodumene ore.

The invention provides a high-throughput screening method for an AI energized beneficiation flotation reagent, and belongs to the technical field of mineral flotation reagent screening. According to the method, high-throughput screening of multiple candidate mineral flotation reagents is achieved through the flotation performance prediction model constructed through the artificial intelligence model, the research and development cycle and test cost of the mineral flotation reagents can be reduced, and the screening efficiency of the mineral flotation reagents can be improved.

This invention belongs to the field of mineral flotation technology, and discloses a flotation collector for non-ferrous metal sulfide ores, its preparation method, and its application. The collector uses O,O-dialkyldithiophosphate as a starting material, and reacts sequentially with a halocarboxylic acid ester, hydrazine hydrate, potassium hydroxide, and carbon disulfide in anhydrous ethanol in a three-step reaction to obtain the target product, O,O-dialkyldithiophosphate hydrazide-N′-dithiocarbamate potassium. Its molecular structure simultaneously contains three active groups: a dithiophosphate group, an hydrazide group, and a dithiocarbamate group. This invention achieves efficient process connection and smooth transition by optimizing the material ratio, temperature, and time of each reaction step, and has advantages such as mild reaction conditions, simple operation, few side reactions, high yield, and stable product. The prepared collector exhibits excellent collecting performance and good selectivity for non-ferrous metal sulfide ores such as chalcopyrite, and is suitable for widespread application in sulfide ore flotation processes.

The present application belongs to the field of mineral flotation, and particularly relates to a method for enriching rubidium and / or cesium in a mineral by flotation, wherein a target mineral containing at least one target element of rubidium and / or cesium is mixed with a flotation reagent containing a collector of formula 1 to perform flotation, and a flotation concentrate enriched with the target element is collected. 10 ~C 18 The alkyl group, M is H, Na, K or ammonium ion. The present application shows that the collector of formula 1 is used innovatively, which can realize synergy based on the combination of intramolecular-COO and R-N- in the alpha position, so as to adapt to the collection characteristics of rubidium and / or cesium minerals, and excellent collection and enrichment effect of rubidium and / or cesium minerals can be obtained.

The invention belongs to the technical field of mineral flotation, and particularly relates to a collecting agent for niobium mineral flotation and a preparation method and application of the collecting agent. Hydroximic acid groups of the hydroximic acid medicament are chelated with Nb < 5 + > on the surface of the niobium mineral to form a stable chelate; and through the synergistic effect of the dihydroxamic acid groups on the surface of the niobium mineral, the adsorption effect is enhanced. Moreover, the hydroximic acid medicament and the nonionic surfactant form stable micelles on the surface of the mineral, so that the hydrophobicity of the surface of the mineral is improved, and the enhanced recovery and efficient enrichment of the niobium mineral are realized. The prepared collecting agent is easy to dissolve in water, has good selectivity, high collecting capacity and wide adaptability to Bayan obo niobium minerals during flotation operation, can meet the requirements of various flotation processes, and can effectively collect niobium minerals under the condition that other gangue ores are not collected.

A method for treating process water of a flotation arrangement, the flotation arrangement including a flotation arrangement including a mineral flotation line and a process water treatment arrangement for treating underflow of the of the mineral flotation line. The method includes the steps of a) dewatering underflow from the flotation in a gravitational solid-liquid separator; b) subjecting supernatant from step a) to cleaning flotation for collecting at least fine particles and residual flotation chemicals, for separating at least fine particles and residual flotation chemicals from the supernatant into cleaning flotation overflow, and for forming purified process water as cleaning flotation underflow; c) removing cleaning flotation overflow as tailings, and d) recirculating purified process water into the mineral flotation line.

The invention discloses a copper-molybdenum bulk concentrate flotation separation combined inhibitor and application thereof, and belongs to the technical field of mineral flotation separation. The combined inhibitor is formed by mixing isomaltose and sodium hexametaphosphate. The method for using the combined inhibitor for flotation separation of the copper-molybdenum bulk concentrate specifically comprises the steps that the copper-molybdenum bulk concentrate is subjected to scrubbing, reagent removal and pulping; a combined inhibitor, a collecting agent and a foaming agent are sequentially added into the ore pulp, primary roughing is conducted, and roughing concentrate and roughing tailings are obtained; the roughing concentrate is subjected to three times of concentration, a combined inhibitor is supplemented in each time of concentration, and copper concentrate is obtained; and the roughing tailings are subjected to two times of scavenging, the collecting agent is supplemented in each time of scavenging, and molybdenum concentrate is obtained. According to the method, the floatability difference of the copper ore and the molybdenum ore is enlarged by inhibiting molybdenum and floating copper, the use of high-toxicity agents can be reduced, meanwhile, copper can be efficiently recycled, the grade of molybdenum concentrate can be guaranteed, and good environmental compatibility and industrial application prospects are achieved.

The invention relates to the technical field of mineral flotation, and discloses a method for compounding a lithium oxide collecting agent in a low-temperature environment, and the lithium collecting agent comprises the following compounding raw materials in percentage by mass: 15-25% of palmitic acid soap; 10%-20% of sulfonated petroleum; 5% to 10% of iso-tridecanol polyoxyethylene ether; 8%-15% of fatty alcohol-polyoxyethylene ether; 3%-8% of polyoxyethylene ether sodium sulfonate; 5%-10% of dipropylene glycol monomethyl ether; 8%-15% of sodium carbonate; 2%-5% of sodium hydroxide; 0.5%-2.0% of sodium fluoride; 0.5%-2.0% of aluminum sulfate; 1%-4% of tannic acid; a synergistic surfactant system is formed by constructing palmitic soap and sulfonated petroleum as a main collecting frame and compounding isomeric alcohol ether, fatty alcohol-polyoxyethylene ether and polyoxyethylene ether sodium sulfonate, dipropylene glycol monomethyl ether is introduced as a low-temperature mutual solvent, and the low-temperature mutual solvent is used for collecting the high-temperature-resistant oil-displacing agent for the oil-displacing oil-displacing agent for the oil-displacing oil-displacing oil-displacing oil-displacing oil-displacing oil-displacing oil-displacing oil. The freezing point and viscosity of a collecting agent system are greatly reduced, the liquidity, uniformity and dispersion stability of the collecting agent are still kept when the collecting agent is used in the low-temperature environment of 0-15 DEG C, and the failure problem caused by low-temperature solidification or layering is fundamentally avoided.

The invention provides a gold enhanced flotation method based on electrochemical bubble interface electronic state regulation and control, and belongs to the technical field of mineral flotation. The method comprises the following steps: grinding gold-bearing ore and pulping to obtain ore pulp; performing micro-nano bubble treatment on water to obtain bubble water; applying external potential to the sparkling water for electrochemical regulation and control to obtain functionalized sparkling water; and the ore pulp, the functionalized bubble water, a collecting agent and a foaming agent are mixed and then subjected to flotation, and gold concentrate is obtained. A bubble interface is used as a core regulation and control object, and the electronic state of the bubble interface is regulated through external potential, so that the bubble interface forms a functional interface with stable charge distribution and interface polarization characteristics, and the interface interaction between bubbles and gold and gold-loaded sulfide particles is enhanced; and the collision and attachment probability of fine mineral particles and bubbles is improved. Under the condition that the using amount of the collecting agent is low, the total flotation recovery rate of gold can be increased, meanwhile, the recovery efficiency of micro-fine particle gold is remarkably improved, and the stability of the flotation process is improved.

The invention relates to the technical field of mineral flotation, and discloses a reaction device for preparing an environment-friendly gold ore dressing agent, the reaction device comprises a base, the top end of the base is connected with a heat preservation cylinder, the top end of the heat preservation cylinder is connected with a fixed shell, and the top end of the fixed shell is rotatably provided with a rotating cover; the top end of the rotating cover is connected with a hydraulic cylinder, and the output end of the hydraulic cylinder penetrates and extends into the rotating cover. According to the device, the mixing effect can be improved while mechanical stirring and mixing can be achieved, mixed slurry can be extruded out and discharged into the reaction assembly in cooperation with a hydraulic cylinder, linkage is guaranteed, the heating effect and the reaction efficiency are effectively improved through a micro channel in the reaction assembly, and the reaction efficiency is improved. The high-temperature slurry can be rapidly cooled through the refrigeration sheet below the material receiving groove, and the stirring frame for stirring can ensure the cooling uniformity, so that the reaction efficiency of preparation is further improved.

The invention relates to a phase volume fraction monitoring and dynamic mapping device and method suitable for fluidized bed flotation, belongs to the technical field of mineral flotation, and solves the technical problems that in the prior art, in existing fluidized bed flotation, single-point pressure or single-layer resistance tomography measurement is mostly adopted, and the measurement accuracy is high. Three-phase partition detection along the axial direction is difficult to realize, and the problems of bed structure evolution and inaccurate relation between the bed structure evolution and flotation dynamics are reflected. The system comprises a fluidized bed flotation unit and a data acquisition unit, the fluidized bed flotation unit comprises a fluidized bed column body, and the data acquisition unit comprises an electrical resistance tomography electrode and a pressure sensor; the resistance tomography electrodes and the pressure sensors are arranged in a staggered mode in the axial direction of the fluidized bed column body, and the multiple layers of resistance tomography electrodes and the multiple layers of pressure sensors are arranged in the axial direction of the fluidized bed column body. According to the method, conductivity and pressure drop data are fused, partition dynamic reconstruction of the three-phase volume fraction can be achieved, and the accuracy of reflecting bed layer structure evolution and the relation between the bed layer structure evolution and flotation dynamics is improved.

The application provides a gangue mineral dispersion inhibitor and a preparation method and application thereof, and relates to the field of mineral flotation. The preparation method of the gangue mineral dispersion inhibitor comprises the following steps: mixing phytic acid, oxalic acid and sodium silicate with water to obtain a sodium silicate solution; wherein the mass ratio of the phytic acid, the oxalic acid and the sodium silicate is 1:(1-2):(2-4). The gangue mineral dispersion inhibitor can be used in the process of recovering ilmenite from iron ore tailings. The phytic acid, the oxalic acid and the sodium silicate cooperate with each other, can effectively inhibit various gangue minerals, effectively improve the grade and recovery rate of ilmenite, and improve the problem that ilmenite in the iron ore tailings is difficult to be efficiently recovered.

The invention provides an ilmenite collecting agent and a preparation method and application thereof, and relates to the technical field of mineral flotation separation. According to the preparation method, the ilmenite collecting agent can be efficiently and stably prepared by performing a hydroximation reaction on the cycloalkane carboxylic acid methyl ester compound and the free hydroxylamine solution and combining a preparation process of methanol separation treatment, acidification treatment and freeze-drying treatment; the preparation method is simple and easy to operate, large-scale production is easy, and great innovation is brought to large-scale obtaining of high-grade and high-recovery-rate concentrates through a flotation process of oxidized minerals. The molecular formula of the ilmenite collecting agent is Cn + 1H2n + 1O2N; or is Cn + 2H2n + 2O2N (n is an integer from 3 to 10). And the method can show remarkable advantages in ilmenite flotation. The high-temperature-resistant environment-friendly paint can keep excellent performance under the conditions of different pH values and temperatures, is high in adaptability and low in toxicity, and meets the environment-friendly requirements of green mines.

The present application belongs to the field of calcium-containing mineral flotation, and particularly relates to a combined collector, which comprises a collector A and a collector B, wherein the collector A is at least one compound with the structural formula of formula 1; the collector B is a collector capable of collecting scheelite; in R1-R4, at least two substituents are substituents of formula a, and the remaining substituents are H, C1-C3 alkyl or formula a. The present application also includes the use of the combined collector for the collection and flotation of scheelite. The combined collector can synergistically improve the flotation of scheelite and help to improve the selective flotation separation of scheelite and calcium-containing gangue.

This invention discloses a method for preparing a composite flotation reagent using biomass hydrothermal liquefaction products, comprising the following steps: Raw material preparation: providing biomass raw materials rich in lipids or proteins; Catalytic hydrothermal liquefaction: placing the biomass raw materials and a composite catalyst in a reactor, reacting at a temperature of 250-350℃ and a pressure of 4-20 MPa, wherein the water content of the biomass raw materials is 70-95%, and the composite catalyst contains alkaline components, metal oxide components, and rare earth element components; Product separation: separating the reaction products into oil and water to obtain bio-crude oil containing amphiphilic molecules; Flotation application: applying the bio-crude oil as a composite flotation reagent to mineral flotation, where the bio-crude oil simultaneously functions as a frother and a collector. This invention uses waste biomass as raw material to prepare a composite flotation reagent with both frother and collector functions, realizing the resource utilization of waste and the green upgrading of flotation reagents, and has the characteristics of wide raw material sources, excellent reagent performance, and environmental friendliness.

The invention discloses a method for flotation separation of galena and sphalerite, and belongs to the technical field of mineral flotation. The method comprises the steps that sodium hypochlorite and manganese sulfate are added into lead-zinc bulk concentrate pulp for an oxidation reaction, filtering is conducted after the reaction, polyvinyl alcohol is added into filter residues for continuous reaction, and treated pulp is obtained; and then a collecting agent and a foaming agent are added, and efficient separation of galena and sphalerite is achieved through the flotation process of one-time roughing, three-time refining and two-time sweeping. Sodium hypochlorite and manganese sulfate have a synergistic effect in ore pulp, a hydrophilic oxide layer and an inorganic film are formed on the surface of the sphalerite, and polyvinyl alcohol further forms a compact organic adsorption layer through hydrogen bonds, so that inhibition on the sphalerite is enhanced. The method can effectively inhibit sphalerite and improve lead-zinc separation selectivity and efficiency, and is especially suitable for separation of complex lead-zinc ore.

The application discloses a kind of iron wurtzite and sulphide iron ore mineral asynchronous flotation separation method, belong to nonferrous metal sulphide mineral flotation technical field;The application promotes the flotation of iron wurtzite by slurry aeration, realizes the asynchronous flotation of iron wurtzite, pyrite and pyrrhotite by means of high selectivity collector CTB-2 and oxidant calcium hypochlorite, solves the problem of difficult separation of iron wurtzite and pyrrhotite, and uses high concentration copper sulfate as depressor to rapidly improve the grade of zinc concentrate, uses ferrous sulfate to realize the sulfur-free flotation of sulfur concentrate, and finally obtains high-quality zinc concentrate, first sulfur concentrate (pyrite) and second sulfur concentrate (pyrrhotite) products.The application optimizes and simplifies the beneficiation process, cancels the magnetic separation step in the traditional process, and realizes efficient separation of zinc and sulfur through single flotation method.

The application provides a method for fluorite flotation containing calcite, and belongs to the technical field of mineral flotation, and comprises the following steps: after grinding the fluorite crude ore containing calcite, the fluorite crude ore is mixed with water to obtain a first ore slurry; a hydroxyl carboxylic acid chelating agent is added to the first ore slurry to obtain a second ore slurry; an inhibitor is added to the second ore slurry to obtain a third ore slurry; a collector is added to the third ore slurry to obtain a fourth ore slurry; a frother is added to the fourth ore slurry for flotation to obtain fluorite concentrate. Based on the strong calcium ion chelation reaction, the hydroxyl carboxylic acid chelating agent and the calcium ions on the surface of calcite selectively form stable complexes, which not only enhances the hydrophilicity of the surface of calcite, but also generates a chemical bond with extremely high strength, so as to replace the fluorite precipitate on the surface of calcite, and achieve the purpose of cleaning the surface of calcite and eliminating the phenomenon of homogenous transformation.

The invention discloses a combined reagent for mixed flotation of copper-nickel sulfide ores and application, and belongs to the technical field of mineral flotation reagents. The combined medicament is composed of a component 1 (amine compound) and a component 2 (composite oil phase) which are independently subpackaged, and the component 2 is prepared by compounding sulfur-nitrogen ester, 2 # oil, N, N-dialkyl dithiocarbamate and a nonionic surfactant. Through step-by-step addition of the two components and synergistic compounding of the interior of the component 2, the agent has high collecting performance and good foaming performance, and the recovery rate of pentlandite and chalcopyrite is remarkably increased; meanwhile, the problems that a conventional medicament is easy to crystallize at low temperature and poor in flowability are effectively solved, and the medicament system is simple and low in cost. The method is particularly suitable for bulk flotation of the copper-nickel sulfide ore and has a wide industrial application prospect.

The invention provides a synthesis method of an acrylamide-hydroxyethyl methylacrylate binary polymer and application of the acrylamide-hydroxyethyl methylacrylate binary polymer in pyrite beneficiation. The method comprises the following steps: water-phase free radical copolymerization: dissolving acrylamide in deionized water, dropwise adding hydroxyethyl methylacrylate under the protection of an inert atmosphere, heating to 55-65 DEG C, then adding an ammonium persulfate-sodium hydrogen sulfite initiator into a mixed system in batches, carrying out a heat preservation reaction at 55-65 DEG C for 4-6 hours, adjusting the pH value of a product to 6.5-7.5 after the reaction is finished, and carrying out water-phase free radical copolymerization; the binary polymer is obtained. The prepared polymer is used as an inhibitor in ore pulp, when the dosage is 100-500 g / t according to the mass of treated ore and the pH value of the ore pulp is 6-9, the pyrite recovery rate can be effectively reduced, the pyrite removal effect is improved, meanwhile, the influence on target mineral flotation is small, and the method is suitable for industrial production. The method does not need an organic solvent, the condition is mild, the product performance is stable, the repeatability is good, and the method is suitable for industrial preparation and application.

The application discloses a sulfuric acid-free and hydrofluoric acid-free reverse flotation method for preparing high-purity quartz sand from pegmatite, and belongs to the technical field of mineral flotation. The application removes iron impurities from the crushed and ground pegmatite by magnetic separation to obtain non-magnetic mixed ore; then, a combined collector 1 composed of anion and cation collectors is added into the non-magnetic mixed ore, mica flotation is carried out without adjusting the pH of the ore slurry, and mica foam products and mixed mineral slurry containing feldspar and quartz are obtained; then, mixed depressants and a combined collector 2 are added into the mixed mineral slurry containing feldspar and quartz to carry out quartz reverse flotation, and feldspar foam products and quartz products with a purity of more than 2N are obtained; finally, the feldspar foam products can be further subjected to fine selection to obtain final feldspar products. The process flow is simple, the conditions are mild, and the process is sulfuric acid-free and hydrofluoric acid-free, so that the corrosion degree of the equipment is low, the environmental pollution is small, and the process is suitable for industrial application.

The invention discloses an iron oxide ore combined collecting agent and application thereof, and belongs to the technical field of mineral flotation. According to the combined collecting agent, a multi-element mixed coordination field is constructed through dihydroxamic acid and oximido, a stable composite adsorption layer is formed, and meanwhile, a dense hydrophobic layer is constructed on the surface of a mineral through the hydrophobic synergistic effect of a flexible aliphatic chain and a rigid benzene ring. The application of the combined collecting agent in iron oxide ore flotation comprises the steps that after iron oxide ore is smashed and subjected to size mixing, the combined collecting agent and a foaming agent are added, an oxidizing agent can also be added, and concentrate is obtained after air inflation flotation. The combined collecting agent can achieve efficient flotation of ilmenite, hematite and siderite under the mild condition, and has the advantages of being good in selectivity, high in recovery rate, small in dosage and environmentally friendly.