32 results about "Molybdenite" patented technology

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 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 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.

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 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 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.

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 invention belongs to the technical field of production and preparation of ammonium tetramolybdate, and particularly relates to a preparation method for producing high-purity ammonium tetramolybdate by utilizing low-grade molybdenite. According to the method, the surface of molybdenite is selectively oxidized and activated under the mild condition, and meanwhile, ammonium ions are used for inhibiting dissolution of associated metal sulfide. A collaborative purification strategy of lime milk sulfur fixation-carbon dioxide carbonation is adopted, sulfate radicals are efficiently precipitated with low-cost lime milk, ammonia gas is synchronously recovered, the pH is precisely regulated and controlled through the mild acidification effect of carbon dioxide, and residual calcium, magnesium and heavy metal ions are deeply removed in the form of carbonate. And finally, by virtue of the specific chelation of the aminophosphonic acid functionalized mesoporous adsorbent on heavy metal ions and the membrane separation and resource recycling of an electrodialysis-mother liquor circulating system on foreign ions, the purity of the ammonium tetramolybdate product is ensured, and meanwhile, a production process which is free of roasting and high in resource utilization rate is formed.

This invention discloses a flotation separation method for copper-molybdenum mixed concentrate. The method involves de-reagenting the copper-molybdenum mixed concentrate obtained by flotation, adding inhibitor I, and then adding a frother for further flotation to remove impurities, yielding flotation foam A and product B in the flotation tank. Inhibitor II is added to flotation foam A, and flotation yields copper-molybdenum mixed concentrate C and product D in the flotation tank. Product B in the flotation tank is mixed with copper-molybdenum mixed concentrate C, and inhibitor III and collector B are added for flotation of molybdenite, yielding molybdenum concentrate and copper concentrate. This invention comprehensively considers the influence of flotation reagents on the separation of copper, molybdenum, and talc in copper-molybdenum mixed flotation. Through the precise synergistic effect of flotation reagents and their optimized combination with the flotation process structure, the separation of copper, molybdenum, and easily floatable gangue minerals such as talc in the copper-molybdenum mixed concentrate is achieved. This method features a short process flow and high separation efficiency, and has significant practical value.

The present application provides a kind of molybdenite flotation method of micro fine particle, and the molybdenite ore of micro fine particle is stirred into ore slurry by adding water, and then the pH of ore slurry is adjusted;First, a certain concentration of emulsified composite hydrocarbon oil is added to adjust the pulp, then AEO-3P or AEO-9P is added to adjust the pulp, and finally a foaming agent is added to adjust the pulp, and then flotation is carried out;Air flotation is carried out to obtain froth concentrate product and tailings.The present application can simultaneously control the hydrophobicity of molybdenite "face" and "edge" in the combined collector, significantly improve the floatability of micro fine particle molybdenite, and the compatibility between each component of the reagent is good.The combined collector provided by the present application has a significantly stronger collecting effect than the emulsified hydrocarbon oil or anionic surfactant used alone, has a small amount and a low cost.

The invention discloses a method for oxidizing molybdenite and synchronously fixing sulfur through high-iron manganese ore, and belongs to the technical field of non-ferrous metallurgy smelting. The method comprises the following steps: respectively crushing high-iron manganese ore and molybdenite, grinding to predetermined fineness, sieving with a 200-mesh sieve, and stirring and mixing according to the molar ratio of manganese element to molybdenum disulfide, namely n (Mn): n (MoS2), of 1.0: 1-2.5: 1; then in a pure oxygen atmosphere, oxidizing roasting is carried out by adopting two-stage temperature control, heat preservation is carried out at the first stage of 440-460 DEG C, heat preservation is carried out at the second stage of 540-560 DEG C, molybdenum in molybdenite is oxidized, meanwhile, sulfur is fixed into sulfate, and a roasted product containing molybdenum oxide and manganese sulfate is obtained; according to the method, the oxidizability of MnO2 and the catalytic action of Fe2O3 in the high-iron manganese ore are utilized, sulfur is efficiently fixed into manganese sulfate while molybdenite is completely oxidized, the sulfur fixation rate can reach 80% or above, value-added utilization of two mineral resources is synchronously achieved, SO2 emission is greatly reduced, and the method has the advantages of being short in process, low in energy consumption, low in cost, environmentally friendly and the like.

The invention belongs to the field of synthesis of molybdenum dioxide dichloride, and particularly relates to a synthesis method of molybdenum dioxide dichloride. Comprising the following steps: S1, pretreating a molybdenite raw material; s2, the pretreated molybdenite raw material is placed in a reactor, chlorine trifluoride, oxygen, fluorine mixed gas and inert gas are introduced into the reactor and react with the pretreated molybdenite raw material at the reaction temperature of 20-50 DEG C, and a crude product of dichloromolybdenum dioxide and a crude product of sulfur tetrafluoride are generated; and collecting a dichloromolybdenum dioxide crude product from the bottom of the reactor. The raw ore molybdenite is used as the molybdenum raw material, the cost of the synthesis process is reduced, the process route is simple, and the reaction conditions are milder; in addition, the byproduct sulfur tetrafluoride in the invention is a product with high added value.

The invention belongs to the technical field of mineral flotation, and particularly relates to a molybdenite flotation accelerant and a preparation method and application thereof.The preparation method of the molybdenite flotation accelerant comprises the following steps that citric acid (sodium), polyvinyl alcohol and gluconic acid (sodium) are dissolved in water according to the mass ratio of 1: (0.1-10): (0.1-10), and the total mass concentration is controlled to range from 20% to 80%; slowly adding caustic alkali into the mixture until the pH is increased to 10-14 and the temperature does not exceed 40 DEG C; carbon disulfide is slowly dropwise added under the stirring condition, the reaction temperature is kept at 0-40 DEG C, after the carbon disulfide is dropwise added, the temperature is increased to 10-40 DEG C at the speed of 1-3 DEG C / min, a heat preservation reaction is conducted for 1-6 h, cooling is conducted to the room temperature after the reaction is completed, and the molybdenite flotation accelerant is obtained. According to the method, the molybdenum grade in the concentrate can be remarkably improved, and meanwhile the grades of copper, lead and zinc in the concentrate are effectively reduced.

The application belongs to the technical field of two-dimensional material preparation, and relates to a two-dimensional transition metal compound and a preparation method and application thereof, and the preparation method comprises the following steps: 1) grinding molybdenite into micron-sized mineral powder; 2) mixing the micron-sized mineral powder with a chlorine salt, and performing high-temperature molten salt reaction under a reaction atmosphere and then cooling to room temperature to obtain a reaction product; and 3) washing and drying the reaction product to obtain molybdenum nitride or molybdenum phosphide. The application realizes efficient conversion from a bulk layered transition metal sulfide to a two-dimensional transition metal compound nanosheet by using the fluxing, intercalation and exfoliation effects of molten chlorine salt; different two-dimensional molybdenum-based nitrides or phosphides of different phases can be selectively prepared by adjusting the reaction temperature and chlorine salt composition; the method has simple synthesis process, controllable cost and high production efficiency, and the by-product salt after the reaction is easy to recycle and reuse, and belongs to a green and industrialized two-dimensional material preparation process, and has wide popularization and application prospects.

The invention relates to a collecting agent for flotation of mud-gangue-containing molybdenum sulfide ore and a flotation method, in particular to the field of mineral flotation, and aims to overcome the defects that in the flotation of the mud-gangue-containing molybdenum sulfide ore, due to the influence of mud gangue, the grade and the recovery rate of molybdenum concentrate are low. The collecting agent comprises light white oil, ethionine ester, a non-ionic surface active agent and polyethylene glycol. According to the collecting agent, through the synergistic effect of all the components, surface-edge double-site full-coverage adsorption of molybdenite is achieved, meanwhile, interference of slime and metal ions is effectively avoided, and on the premise that pre-desliming is not needed, efficient recycling of mud-containing gangue molybdenum sulfide resources is achieved; and meanwhile, all the components are industrial conventional environment-friendly agents, are easy to degrade and are suitable for flotation of the mud gangue-containing molybdenum sulfide ore, and the utilization efficiency of molybdenum ore resources and the environment-friendly level of the ore dressing process are remarkably improved.

The application discloses a method for preparing molybdenum trioxide from molybdenite, and the molybdenite is soaked in acid to remove impurities, and refined molybdenite is obtained through filtration; the refined molybdenite is high-temperature oxidized and roasted, and after the end, sodium molybdate solution or hydrogen peroxide is used to selectively dissolve molybdenum from molybdenum calcine, the obtained molybdenum solution is contacted with cation exchange resin or cation extraction agent, and after impurity removal, a pure molybdenum solution is obtained. The pure molybdenum solution is placed in an autoclave, and after adding molybdenum trioxide powder and a control agent, thermal decomposition is carried out, and molybdenum trioxide is obtained. After filtration, washing and drying of the molybdenum trioxide, molybdenum trioxide powder is obtained.

The application belongs to the technical field of mineral processing, and particularly relates to a method for optimizing copper-molybdenum mixed concentrate flotation, which comprises the following steps: S1: drying; S2: grinding; S3: electroseparation pretreatment; S4: flotation machine flotation; S5: flotation scavenging; and S6: quasi-asynchronous flotation. The copper-molybdenum mixed concentrate is subjected to desmearing and impurity removal through the three pretreatments of drying, grinding and electroseparation. The effect of flotation reagents on minerals is significantly improved due to the desmearing treatment, which is conducive to the inhibition of chalcopyrite in the copper-molybdenum mixed concentrate. In addition, the grade of the selected ore is improved through quasi-asynchronous flotation, which is conducive to flotation. Since the scavenging concentrate contains reagents, the use of flotation reagents can be appropriately reduced, the cost is saved, the environment is friendly, the recovery rate of molybdenite is significantly improved, and the method has the potential for popularization and application.

The invention provides a chalcopyrite inhibitor and application of the chalcopyrite inhibitor in copper-molybdenum ore flotation separation, and relates to the technical field of mineral processing. The chalcopyrite inhibitor is xanthic acid-based cellulose, and in copper-molybdenum ore flotation, the xanthic acid-based cellulose is used as the inhibitor, and copper-molybdenum ore flotation separation is carried out through a closed-loop flotation process including one-time roughing, six-time concentration, two-time scavenging and middling sequential returning. According to the method, the chalcopyrite is selectively inhibited by adding xanthate cellulose serving as an inhibitor, the floatability difference between molybdenite and the chalcopyrite is enlarged, and therefore effective separation of the molybdenite and the chalcopyrite is achieved by adding the collecting agent. The inhibitor xanthate cellulose has the advantages of being simple to synthesize, wide in material source, high in selectivity, environmentally friendly and the like, floating of the chalcopyrite can be strongly inhibited, the influence on the floatability of molybdenite is small, and efficient separation of the chalcopyrite and the molybdenite is achieved.

The invention relates to the technical field of mineral resource flotation recovery, in particular to a method for inhibiting surface oxidation of fine-fraction molybdenite and enhancing the flotation effect. Comprising the following steps that molybdenite is ground and then introduced into a flotation tank, the ore pulp concentration is regulated and controlled, stirring is conducted for 15-20 min, and a component A is obtained; regulating and controlling the concentration of dissolved oxygen in the component A, adding a reducing regulator, regulating the pH value, and stirring for 2-3 minutes to obtain a component B; kerosene and No.2 oil are added into the component B, then flotation is conducted for 3-4 min, and concentrate and tailings are collected. The method is easy to operate, surface oxidation is inhibited by introducing the protective gas and adding the reducibility regulator, the molybdenite flotation recovery rate is increased, and the method has remarkable economic benefits and application prospects.

The utility model relates to a device for recovering molybdenite from fine silt in the field of preparation equipment. The device comprises a thickener I, a discharging pipe of the first thickener is connected with a sand pump pool, the sand pump pool is connected with a swirler through a guide pipe, the discharging end of the swirler is connected with a first stirring barrel, the discharging end of the first stirring barrel is connected with a first flotation machine, the discharging end of the first flotation machine is connected with a second thickener, and the discharging end of the second thickener is connected with a second stirring barrel. The discharging end of the second stirring barrel is connected with a second flotation machine, and tailings of the second flotation machine are conveyed into the first thickener through a first feeding pump. The device is reasonable in structure, easy to operate, low in reaction condition requirement and the like, the removal rate of mud ranging from-5 mu m to 10 mu m is high, the contact opportunity of fine-fraction molybdenite and beneficiation reagents is increased, therefore, the recovery rate of the molybdenite is improved, it is guaranteed that the flotation concentration can meet the process requirement, the automation degree is high, mud removal and concentration control are more accurate, and the production efficiency is improved. Molybdenum concentrate grade and recovery rate can be better improved, and mineral resource utilization rate is improved.

The invention discloses quaternary ammonium cation modified lignin, a preparation method of the quaternary ammonium cation modified lignin and application of the quaternary ammonium cation modified lignin as a chalcopyrite inhibitor, and belongs to the technical field of mineral separation. The molecular structural formula of the quaternary ammonium cation modified lignin is shown in the specification. Wherein R1, R2, R3 and R4 are independently selected from hydrogen or quaternary ammonium salt groups, and at least one of R1, R2, R3 and R4 is a quaternary ammonium salt group; the preparation method comprises the following steps: alkalizing lignin to obtain alkalized lignin; and then carrying out etherification reaction with quaternary ammonium salt to obtain quaternary ammonium cation modified lignin. The product has a selective inhibition effect on the flotation of the chalcopyrite, and is particularly suitable for the flotation separation of metal sulfide ores (such as molybdenite, galena and the like) and the chalcopyrite.