60 results about "Molybdenite" patented technology

The invention relates to the technical field of production and preparation of ammonium tetramolybdate, and particularly discloses a preparation method for producing high-purity ammonium tetramolybdate from low-grade molybdenite. The preparation method for producing the high-purity ammonium tetramolybdate from the low-grade molybdenite comprises the following steps: S1, pretreating the low-grade molybdenite to obtain slag, and roasting the slag to obtain roasted slag; s2, the roasted slag and an ammonia water solution are mixed and leached, and a leaching solution is obtained; s3, an impurity removal agent and an adsorbent are added into the leachate for adsorption and purification, the impurity removal agent comprises mercaptoacetic acid and disodium ethylene diamine tetraacetate, the adsorbent is modified calcium alginate, and after purified liquid passes through an anion exchange resin column, an ammonium molybdate solution is obtained; and S4, adding a nitric acid solution into the ammonium molybdate solution, adjusting the pH value, and then crystallizing to obtain high-purity ammonium tetramolybdate. According to the preparation method, the purity of the ammonium molybdate solution is effectively improved through three procedures, and then the purity of ammonium tetramolybdate prepared from low-grade molybdenite is effectively improved.

The present invention provides a flotation depressant for separating chalcopyrite and molybdenite, and a chalcopyrite and molybdenite beneficiation method, specifically relating to the field of mineral processing technology. The flotation depressant comprises sodium thioglycolate, a hydroxycarboxylic acid homologue, and a reducing agent in a mass ratio of (20-60):(1-5):(1-5). The hydroxycarboxylic acid homologue comprises at least one of 3-mercaptopropionic acid, β-mercaptopropionic acid, thiopropanoic acid, mercaptopropionic acid, and thiolactic acid. The flotation depressant provided by the present invention is economical to use and easy to add, effectively achieving efficient separation of molybdenite and chalcopyrite. Furthermore, the flotation depressant successfully solves the problem of excessive copper impurities in molybdenum concentrate when using only sodium thioglycolate, thereby reducing the overall cost of the depressant during flotation. The flotation depressant is not only highly efficient, but also clean and safe, effectively solving the difficulties in the separation of chalcopyrite and molybdenite.

The present invention belongs to the fields of catalysts and petrochemicals, and specifically relates to a catalyst, its preparation method, and its application. The catalyst comprises a composite support and an active metal Ni supported on the composite support. The composite support is composed of a modifier and a natural mineral compound, wherein the modifier comprises zirconium and a rare earth metal. The natural mineral is selected from one or more of diatomaceous earth, sepiolite, halloysite, attapulgite, vermiculite, and molybdenite. The rare earth metal is selected from one or more of yttrium, lanthanum, cerium, neodymium, samarium, europium, gadolinium, and ytterbium. The catalyst of the present invention has good structural stability and exhibits high activity and selectivity in the catalytic production of DMS. The catalyst of the present invention exhibits excellent performance in the hydrogenation of DMM to produce DMS, effectively improving DMS selectivity and reducing the production of GBL, BDO, and THF.

The invention discloses a method for removing iron and copper from molybdenite, which comprises the following steps: uniformly mixing the molybdenite and magnesium chloride, carrying out high-temperature vacuum melting, removing iron sulfide, copper oxide and other impurities in the molybdenite through vacuum chlorination melting, directly recycling magnesium chloride in a condensing disc in one step for reutilization, carrying out water leaching and acid leaching washing on roasting residues, and drying. Removing residual iron oxides and magnesium compounds generated by chlorination to obtain residues rich in molybdenum disulfide; according to the method, the iron and copper impurities in molybdenite are effectively removed in a vacuum chloridizing roasting and acid leaching mode, and the method has the advantages of being short in process, low in cost, high in metal recovery rate and small in environmental pollution.

This invention relates to the field of mineral processing technology, specifically to an environmentally friendly copper-molybdenum separation inhibitor, its preparation method, and its application. The method includes: mixing starch and formamide, stirring at room temperature, cooling in an ice-water bath at -5°C, slowly adding chlorosulfonic acid at this temperature to initiate a sulfonation reaction, neutralizing to pH 7-8 with sodium hydroxide solution after the reaction, adding anhydrous methanol to precipitate the product, and washing and drying to obtain the sulfonated anionic starch polymer DGSS. The inhibitor is applied to the flotation separation of copper-molybdenum mixed concentrates, combined with a closed-circuit process of one roughing, one scavenging, and four cleaning stages, employing a gradient reagent reduction and staged kerosene replenishment system from roughing to cleaning. This allows for selective inhibition of copper sulfide minerals such as chalcopyrite at extremely low dosages, with minimal impact on the floatability of molybdenite. It completely avoids the use of toxic substances such as cyanide, Knox reagent, or sodium sulfide, exhibiting good selectivity, low reagent consumption, environmental friendliness, and a simple preparation process that is easy to industrialize.

The application discloses a magnetic separation process for separating fine-grained copper-molybdenum mixed concentrate, and comprises the following steps: roasting and deoiling the fine-grained copper-molybdenum mixed concentrate to obtain copper-molybdenum mixed dry concentrate; preparing a slurry by mixing the copper-molybdenum mixed dry concentrate and water, and sequentially adding an inhibitor, a magnetic intensifier, a strong oxidant and an adjusting agent into the slurry to obtain a copper-molybdenum mixed slurry; and feeding the copper-molybdenum mixed slurry into a wet high-intensity magnetic separator to perform copper-molybdenum magnetic separation, so as to obtain copper concentrate and molybdenum concentrate. The inhibitor, the magnetic intensifier, the strong oxidant and the adjusting agent jointly solve the problem of easy agglomeration of chalcopyrite and molybdenite. During the magnetic separation process of the wet high-intensity magnetic separator, a large amount of flushing water needs to be added, and the reagents on the surface of the copper concentrate can be washed away by the flushing water, so that a good reagent removal effect can be achieved. The obtained magnetic separation concentrate is copper concentrate (copper content is greater than or equal to 12%), which not only increases the economic benefit of the product, but also improves the resource utilization rate.

The present application belongs to the field of non-ferrous metal dressing process, and relates to a grinding-flotation short process separation method for processing fine molybdenite. The process uses a high-pressure roller mill and a tower mill crushing and grinding process to replace the fine crushing and two-stage continuous ball milling operation in the traditional crushing and grinding process, and uses a flotation column to replace a flotation machine for flotation operation, thereby simplifying the production process flow of molybdenite. The present application has the advantages that the high-pressure roller mill and the tower mill change the crushing and grinding mode of the ore, significantly reduce the crushing and grinding energy consumption, and more effectively protect the flaky structure of molybdenite. The particle size distribution of the grinding product is reasonable, and the amount of fine and micro-fine particles (-20 μm) is reduced, thereby creating good conditions for the flotation operation. The flotation column is used for flotation, compared with the flotation machine, the recycling of middling slurry is reduced, the fine molybdenite that has been dissociated is fully recovered, and the recovery rate of molybdenite is improved. In addition, the flotation column flotation is beneficial to obtaining high-grade concentrate product, and improves the separation index and economic benefits of molybdenite.

The invention discloses a microemulsion collecting agent for flotation of high-mud-content and high-oxidation molybdenite and preparation and application of the microemulsion collecting agent and belongs to the technical field of mineral processing, kerosene, xanthate or black powder collecting agents, a main emulsifier, a cosurfactant and water are mixed according to a certain proportion and then subjected to ultrasonic emulsification treatment, and the microemulsion collecting agent is obtained. According to the micro-emulsion collecting agent prepared through the method, after one-time roughing and two-time scavenging are conducted, the molybdenum recovery rate is remarkably increased compared with the molybdenum recovery rate when a kerosene collecting agent is singly used, the micro-emulsion collecting agent is simple in preparation method, high in emulsion stability, high in dispersity in ore pulp and free of slime interference, and the separation and recovery problem of high-argillization molybdenite is well solved.

The present invention discloses an activator for lime-inhibited molybdenite flotation and a molybdenite flotation method, belonging to the field of mineral processing technology. The activator comprises a compound having a nitrogen-containing five-membered heterocyclic ring, having the following molecular structure: #imgabs0#, wherein R1 is a C1-C5 alkyl group or hydrogen, X is N or C-H, and R2 and R3 are independently selected from a C1-C6 alkyl group, a benzene ring, or a benzene ring containing a C1-C6 alkyl group. The use of this activator can significantly alleviate the inhibitory effect of lime on molybdenite flotation in a sulfide ore flotation system, thereby improving the flotation efficiency of the molybdenite, effectively saving collector costs, and reducing the environmental protection pressure brought about by the use of sulfur-containing reagents.

The invention provides a method for efficiently recycling molybdenum in molybdenite ammonia leaching residues based on a composite leaching agent, and belongs to the technical field of molybdenum smelting and resource recycling. The method comprises the following steps that firstly, the molybdenite ammonia leaching residues are ground, and an oxidizing agent is added for pre-activation at the room temperature; then a NaOH aqueous solution and a Na2CO3 aqueous solution are sequentially used for two-stage normal-pressure alkaline leaching, wherein H2O2, NaOH and Na2CO3 form a composite leaching agent; and finally, filtering to obtain molybdenum-containing leaching liquid and low-molybdenum leaching residues. According to the method, through the synergistic effect of the composite leaching agent, H2O2 oxidizes low-valence molybdenum and MoS2 to generate a soluble state, Na2CO3 replaces insoluble molybdate, NaOH maintains high pH to inhibit molybdic acid precipitation, deep recovery of insoluble molybdenum is achieved, high-pressure equipment is not needed, energy consumption and equipment cost are low, H2O2 is clean and free of corrosion, the impurity leaching rate is low, adaptability to different sources, high-calcium type and other difficult-to-treat ammonia leaching residues is high, and the method is suitable for industrial production. The operation is simple.

The invention discloses a polycarboxylic sulfur-nitrogen carboxylic ester compound as well as a preparation method and application thereof. The polycarboxylic sulfur-nitrogen carboxylic ester compound has a structure of R1-S-C (= S)-N-R2-COOR3, and in the structure, R1 is a C1-C5 carboxyl group, R2 is a C1-C6 alkyl group, and R3 is any one of H < + > or a C1-C6 alkyl group. When the polycarboxylic sulfur-nitrogen carboxylate compound is added into a copper-molybdenum mixed ore flotation system, copper minerals can be selectively inhibited under the weakly alkaline condition. Compared with a traditional inhibitor, the multi-carboxyl sulfur-nitrogen carboxylic ester compound has the outstanding advantages that the synthesis route is simple, raw materials are easy to obtain, and the environment compatibility is excellent, the surface wettability difference of copper-molybdenum minerals can be remarkably enlarged through the selective inhibition effect of the compound, and efficient separation of chalcopyrite and molybdenite in associated ore is achieved.

The application discloses a method for separating copper-molybdenum mixed concentrate by advanced oxidation flotation, which comprises the following steps: S1, adding the copper-molybdenum mixed concentrate into a flotation tank with water, and adding peroxysulfate; S2, adding a divalent iron salt to the treated ore pulp, and then adding a collector and a foaming agent, so as to obtain a molybdenum rough concentrate and a copper rough concentrate by flotation; and S3, obtaining a molybdenum concentrate by 4-5 times of cleaning of the molybdenum rough concentrate, and obtaining a copper concentrate by 2-3 times of scavenging of the copper rough concentrate. By adding the peroxysulfate and the divalent iron salt, the application can generate sulfate radicals SO4 ‑ · and hydroxyl radicals ·OH, which have the characteristics of high activity and strong oxidizing property, can effectively decompose organic collectors in the copper-molybdenum mixed concentrate, and can reduce the difficulty of copper-molybdenum separation; and can also oxidize chalcopyrite to generate hydrophilic substances such as oxides and sulfates on the surface of the chalcopyrite, so that the chalcopyrite is inhibited; and the hydrophobicity of molybdenite can be restored by adding the collector, so that the copper-molybdenum efficient and clean flotation separation can be realized.

The application discloses a molybdenite inhibitor APASP and application and a beneficiation method, and the molybdenite inhibitor APASP comprises polyaspartic acid sodium and concentrated hydrochloric acid, and the mass ratio is (5-10):1; when used, two components are respectively configured as aqueous solutions, the mass concentration of the polyaspartic acid sodium aqueous solution is 0.5%-2.5%, the mass concentration of the HCl aqueous solution is 1.0%-5.0%, and the two aqueous solutions are mixed according to the mass ratio (2.5-10):(1-2.5) to obtain the molybdenite inhibitor APASP. The polyaspartic acid sodium is acidified to obtain the molybdenite inhibitor APASP, the molybdenite can be selectively inhibited according to the existing form of the APASP in the ore pulp, and the talc is not affected. The application can improve the beneficiation difficulty of high-talc molybdenum ore, effectively improve the recovery of molybdenum, and has the inhibiting capacity, high selectivity and strong chelating capacity compared with the existing inhibitors, has a large application prospect, and has the scale inhibition capacity, can effectively reduce the equipment scaling, is an excellent green water treatment agent, and can prevent the secondary pollution of water bodies.

This invention discloses a flotation separation method for removing talc from molybdenite using sodium alginate sulfate. The method involves preparing a raw slurry from talc-type molybdenite, controlling the pH of the slurry to be 6.0–10.0. Sodium alginate sulfate is added to the slurry and stirred. Then, an anisopolar collector is added and stirred to condition the slurry. A frother is then added to obtain a mixed slurry. Finally, the mixed slurry is subjected to aerated flotation. The collected frothy product is the molybdenum concentrate, and the product in the tank is the talc-containing tailings. This invention, by adding sodium alginate sulfate (SAS), which has high electronegativity and strong chelating ability, as a specific inhibitor to the flotation system, blocks the contact between the collector and talc. Simultaneously, its strong electrostatic repulsion effectively prevents non-specific adsorption on the negatively charged molybdenite surface. This invention significantly improves the grade and recovery rate of molybdenum concentrate and has extremely high industrial promotion and engineering application value.

The present application relates to the technical field of adsorbent, in particular to a kind of biochar load molybdenite adsorbent, preparation method and application thereof, its preparation method includes the following steps: S1.the preparation of biochar;S2.molybdenite pretreatment;S3.the preparation of biochar load molybdenite;S4.the preparation of adsorbent.The key problem of active component easy to fall off in physical simple mixing is solved by the synergistic effect of modified cleaning solution and modified impregnation solution, the stability of adsorbent is improved, and an internal Mo-Ni synergistic catalytic system is constructed with molybdenite.The synergistic effect of modified cleaning solution, modified impregnation solution and adsorption modifier greatly improves the activation efficiency and pollutant degradation capacity, and enhances the electrostatic adsorption capacity for typical anionic pollutants (such as sulfamethoxazole) in water.

This invention discloses a beneficiation method for complex altered copper-molybdenum ore with high sulfur, iron, talc, and zinc content. Before grinding, harmful metal ions are removed from the raw ore to weaken the floatability of sphalerite and pyrite. The pretreated slurry rapidly floats out talc and coarse-grained copper minerals with high degree of liberation, separating the talc to obtain a high-grade coarse-grained copper concentrate. The rapidly floating tailings float out copper, molybdenum, zinc, and sulfur minerals with complex intergrowth characteristics, as well as some floatable individual minerals. An inhibitor is added, and the ore is re-ground to further weaken the floatability of easily floatable sphalerite and pyrite, thereby separating a mixed concentrate of fine-grained copper minerals and molybdenite. The separated tailings are incorporated into the copper-molybdenum scavenging tailings to recover sphalerite, and the fine-grained copper-molybdenum mixed concentrate is incorporated into the coarse-grained copper concentrate for copper-molybdenum separation, yielding copper concentrate and molybdenum concentrate products. This invention achieves the separation and recovery of copper, molybdenum, and zinc by intervening in harmful metal ions in advance and employing staged grinding and staged flotation, thereby progressively enhancing the differences in surface hydrophobicity of the polymetallic minerals.

The invention discloses an inhibitor for copper sulfide minerals and application of the inhibitor in copper-molybdenum bulk concentrate, and belongs to the technical field of mineral flotation separation. The triazine ring is applied to flotation separation of the copper sulfide and molybdenum bulk concentrate, the technological process of one-time roughing and multiple times of concentration and scavenging is adopted, and a specific amount of triazine ring is added in the roughing stage and the concentration stage. The triazine ring inhibitor used in the invention shows relatively strong chemical adsorption selectivity on copper sulfide minerals, and has relatively small influence on molybdenite. And the triazine ring is a low-toxicity organic compound and can replace traditional chemicals with relatively high toxicity, such as cyanide and sodium sulfide. The inhibitor is high in selectivity, environmentally friendly and low in dosage, efficient separation of copper and molybdenum can be achieved under the neutral pH condition, the obtained molybdenum concentrate is high in grade and low in copper-containing impurity, and remarkable technical advantages and industrial application prospects are achieved.

The invention relates to the technical field of non-ferrous metal beneficiation, in particular to a copper-molybdenum bulk concentrate flotation separation inhibitor, a preparation method thereof and a beneficiation method for copper-molybdenum bulk concentrate separation. The inhibitor comprises D-erythorbic acid and sodium ethylene diamine tetramethylene phosphonate. D-erythorbic acid is used as a strong reducing agent, elemental sulfur and high-valence metal ions generated on the surface of the chalcopyrite due to oxidation or adsorption of the collecting agent can be rapidly reduced, a hydrophobic collecting agent adsorption layer is destroyed, and efficient'reagent removal 'is achieved. Sodium ethylenediamine tetramethylene phosphonate is a polydentate organic phosphonic acid chelating agent, and four phosphonic acid groups of the sodium ethylenediamine tetramethylene phosphonate and Cu < + > / Cu < 2 + > exposed on the surface of the chalcopyrite can form an extremely stable multi-core chelate. The firm adsorption layer enables hydrophilic phosphonic acid groups to face ore pulp, so that the surface of the chalcopyrite is strongly hydrophilic and is deeply inhibited, the two agents do not adsorb molybdenite at all, and under the cooperation of the two agents and under the condition that the using amount of sodium sulfide is low, copper sulfide minerals are effectively inhibited, and efficient separation of copper and molybdenum is achieved.

The invention provides a flotation inhibitor for separating chalcopyrite and molybdenite and a beneficiation method for the chalcopyrite and the molybdenite, and particularly relates to the technical field of beneficiation. The flotation inhibitor comprises sodium thioglycolate, hydroxycarboxylic acid homologues and a reducing agent according to the mass ratio of (20-60): (1-5): (1-5). The hydroxy carboxylic acid homologues comprise at least one of 3-mercaptopropionic acid, beta-mercaptopropionic acid, thiopropanolic acid, mercaptopropionic acid and thiolactic acid. The flotation inhibitor provided by the invention is economical in dosage and simple and convenient to add, and efficient separation of molybdenite and chalcopyrite can be effectively realized. In addition, the flotation inhibitor successfully solves the problem that copper impurities in molybdenum concentrate exceed the standard when only sodium thioglycollate is used, and therefore the overall use cost of the inhibitor in the flotation process is reduced. The flotation inhibitor is efficient, clean and safe, and the problem in the separation process of chalcopyrite and molybdenite is effectively solved.

The present application provides emulsified kerosene, which comprises an emulsifier and kerosene, the emulsifier being selected from C10-16 alcohol alkoxylate and / or polyethylene glycol 600 monooleate. The mass percentage of the emulsifier is 10% to 35% of the kerosene; when the emulsifier is C10-16 alcohol alkoxylate and polyethylene glycol 600 monooleate, the mass ratio of C10-16 alcohol alkoxylate to polyethylene glycol 600 monooleate is 0.3-3:1. The combined collector provided by the present application can synergistically regulate the hydrophobicity of the surface and edge of molybdenite, significantly improve the flotation performance of fine-grained molybdenite, and meanwhile, good compatibility is shown between the components of the collector. The combined collector provided by the present application is significantly superior to emulsified kerosene or non-ionic surfactant used alone in terms of collecting effect, and has lower dosage and cost.

This invention discloses a beneficiation method for high-talc molybdenum ore based on the anisotropy of mineral crystals, comprising the following steps: 1) grinding of the raw ore; 2) molybdenum pre-selection; 3) regrinding with planetary ball mill; 4) molybdenum reverse flotation; and 5) molybdenum direct flotation. Based on the anisotropy of mineral crystals, this invention changes the grinding method by using planetary ball milling, exposing more easily oxidized and hydrophilic end faces of molybdenite before it enters the flotation stage, reducing the difference in hydrophilicity and hydrophobicity of the mineral surface controlled by flotation. Then, by adding the oxidant sodium persulfate and the combined inhibitors dextran and polyepoxysuccinic acid, the hydrophilicity of the molybdenite surface is synergistically enhanced, resulting in talc concentrate and molybdenum rough concentrate. The grade of the molybdenum rough concentrate is then improved through molybdenum direct flotation. This beneficiation method eliminates the need for pre-selection to remove talc, reducing the loss of molybdenum ore during desliming. Using this method, a molybdenum grade of not less than 50% and a molybdenum recovery rate of not less than 72% can be obtained in the molybdenum concentrate, achieving efficient flotation separation of high-talc molybdenum ore.

The invention discloses a talc type molybdenum ore short-process comprehensive utilization method. The method comprises the following steps: carrying out bulk flotation on talc type molybdenum ore to obtain low-grade molybdenum concentrate; adding a magnesium-aluminum additive into the low-grade molybdenum concentrate to prepare a mixture; and finally, heating the mixture to 1250-1400 DEG C, and roasting to obtain the molybdenum-rich volatile matter and the lightweight refractory material. In the beneficiation stage, deep separation of talc and molybdenite is not needed, and high-grade molybdenum concentrate does not need to be selected; and in the roasting stage, metallurgy and material processing are integrated, and deep molybdenum separation and talc component appreciation are synchronously achieved. In conclusion, the method has the remarkable advantages of few procedures, high molybdenum recovery rate, less solid waste and the like, and is suitable for industrial application.

The present application provides a method for measuring the content of molybdenum minerals, which belongs to the field of process mineralogy, wherein the sample to be tested is subjected to grinding, washing and desludging treatment to obtain ore slime and washed ore concentrate; the washed ore concentrate is subjected to gravity separation to separate gravity separation concentrate and gravity separation tailings; the ore slime and gravity separation concentrate are mixed to obtain a mixed sample, and molybdenum phase analysis is performed to obtain the molybdenum oxide content; automatic mineralogical analysis samples of the mixed sample and gravity separation tailings are prepared separately, and automatic mineralogical analysis is performed to calculate the correction coefficient of the molybdenite content and the correction coefficient of the molybdenum oxide content; the content of various molybdenum minerals in the sample to be tested is calculated by combining the correction coefficient and the mineral content data. The present application reduces the oxidation of molybdenite and improves the accuracy of mineral identification by optimizing the sample preparation process. Molybdenum oxide and molybdenum sulfide are treated separately, and different correction processes are adopted to specifically improve the accuracy of ore molybdenum mineral measurement.

The invention discloses a beneficiation method for the tiered separation of copper-molybdenum mixed concentrates. The method comprises the following steps: subjecting the copper-molybdenum mixed concentrate slurry to drug removal treatment under weakly acidic conditions to achieve preliminary separation of the copper-molybdenum mixed concentrate, removing some low-grade copper middlings, and obtaining a higher-grade copper-molybdenum mixed concentrate; then, selectively enriching non-magnetic molybdenite to further separation, and producing a higher-molybdenum-grade mixed concentrate. This method achieves the purpose of reduction in the next sorting process, greatly reduces the amount of inhibitor used when entering the next molybdenum flotation and copper suppression process, further reduces the COD value of wastewater obtained after beneficiation, and can reduce the cost of wastewater treatment in the later stage.

The present invention relates to the field of basalt fiber technology, and discloses a high-temperature resistant basalt fiber and its preparation method and application. The preparation method of the high-temperature resistant basalt fiber provided by the present invention comprises the following steps: mixing basalt, zircon, potassium feldspar, rutile and molybdenite, melting and drawing to obtain a matrix material; mixing a zinc source and a nickel source to obtain a mixed solution; immersing the matrix material in the mixed solution, and solidifying and pressing to obtain. Zinc and nickel elements have high thermal stability. By immersing the matrix material in the mixed solution of the zinc source and the nickel source, the functional groups on the surface of the basalt fiber form chemical bonds with the two ions, so that the zinc source and the nickel source can be firmly adsorbed on the fiber surface, thereby improving the high-temperature resistance and antioxidant capacity of the basalt fiber; and the damage to the basalt fiber itself is small, which helps to maintain the original performance and structural integrity of the basalt fiber, and no harmful gases are generated, and the process is more environmentally friendly.

The invention discloses a method for intensively separating molybdenite and pyrophyllite based on roasting-reverse and direct flotation. According to the process, concentrate containing molybdenite and pyrophyllite is roasted, and the roasted ore is subjected to reverse flotation separation. The surface of the sulfide ore can be oxidized through roasting, the hydrophobic performance of the sulfide ore is reduced, the surface structure of the pyrophyllite is not changed, and the hydrophobic performance of the pyrophyllite is not changed. And the grade of molybdenite in the sulfide ore concentrate can be further improved through reverse flotation. And feeding tailing pulp subjected to reverse flotation into a multi-stage pulp mixing tank to adjust the pH value to be alkaline, and then carrying out direct flotation. According to the method, the flotation difference of molybdenite and pyrophyllite is expanded through oxidizing roasting, the content of the molybdenite in the sulfide ore concentrate is reduced through reverse flotation, the grade of the sulfide ore concentrate is improved, then the floatability of the molybdenite is improved by adjusting the pH of tailing pulp obtained through reverse flotation, and then the grade of the pyrophyllite in the sulfide ore concentrate is reduced through direct flotation. The process is simple and controllable, the obtained concentrate product is high in purity, and industrial application is facilitated.

The invention provides a molybdenite inhibitor and a method for separating copper and molybdenum from molybdenite through the molybdenite inhibitor, and belongs to the field of mineral separation inhibitors. Efficient separation of copper and molybdenum is achieved by designing a double-function synergistic effect mechanism in the molybdenite inhibitor, oxyorthosulfate (-O-C (= S)-S-) in a molecular structure serves as a powerful ore-philic group, and it is ensured that inhibitor molecules are firmly anchored to the surface of a target mineral; in addition, high-density hydroxyl of a molecular skeleton forms a strong hydrophilic group, the surface hydrophilicity is remarkably improved, and adsorption of the collecting agent is hindered. Meanwhile, a double thioester structure (-S-C (= S)-C (= S)-S-) in a molecule is subjected to dipole interaction through an intermolecular disulfide bond (-S-S-) or a thiocarbonyl group (C = S), so that the inhibitor molecule is promoted to generate transverse self-assembly and close packing on the surface of the molybdenite, a compact supramolecular co-adsorption network is formed, and a hydrophilic group is exposed; and finally, a stable and compact super-hydrophilic barrier is constructed on the surface of the molybdenite, an action channel of a collecting agent is thoroughly blocked, and efficient selective inhibition of the molybdenite is achieved.

A preparation method for a molybdenite / ZnO nanorod-based pillared structure and an application thereof are provided, belonging to the field of gas sensing technology. The specific steps include: (1) dispersing commercially available molybdenite in a zinc acetate methanol solution to obtain a solution A; (2) adding a sodium hydroxide methanol solution to the solution A to obtain molybdenite / ZnO nanoparticles; (3) dispersing the molybdenite / ZnO nanoparticles in deionized water to obtain a molybdenite / ZnO nanoparticle suspension; (4) adding the molybdenite / ZnO nanoparticle suspension to a sodium hydroxide solution of ε-Zn(OH)2, heating and aging, stirring, washing, and drying overnight to obtain molybdenite / ZnO nanorods with pillared heterostructure.

The present application relates to the technical field of mineral flotation, and particularly relates to a combined collector and application thereof in flotation of micro-fine molybdenite. The combined collector comprises emulsified non-polar hydrocarbon oil and phosphate anionic surfactant. The combined collector is simple to prepare, can simultaneously control the hydrophobicity of the "face" and "edge" of molybdenite, realizes effective flotation of micro-fine molybdenite, especially micro-fine molybdenite with a particle size of-20 mu m, and shows excellent positive synergistic effect in a wide pH range.

The application provides a flotation separation method of copper-molybdenum mixed concentrate, relates to the technical field of non-ferrous metal dressing and metallurgy, and solves the problems of large amount of existing inhibitor for enlarging the floatability difference of molybdenite and chalcopyrite and serious environmental pollution. The method comprises the following steps: inserting a cathode and an anode into an electrolytic cell respectively, adding a salt solution into the electrolytic cell, adding a copper-molybdenum mixed concentrate slurry into the electrolytic cell while stirring, wherein the anode material is one of Pt-WO3, Ti-SnO2-PbO2, Ti / IrO2-Ta2O5, Ti / SnO2-Sb2O3 or Ti / SnO2-Sb; the salt solution is one or more of sodium nitrate or potassium nitrate; after stirring, the stirring is continuously maintained, a constant current source is turned on, an electric current is applied to the electrolytic cell, and the constant current pretreatment is maintained for 15-35 min to obtain a mixed slurry; and the mixed slurry is transferred to a flotation system for flotation operation to obtain molybdenite and chalcopyrite. The method can adjust the hydrophilicity and hydrophobicity of molybdenite and chalcopyrite, and then separate the two.