119 results about "Reverse flotation" patented technology

The invention discloses a method for preparing high-purity quartz sand through reverse flotation, which comprises the following steps: S1, ore pretreatment: pretreating raw ore to obtain quartz sand; the quartz sand obtained in the first step is placed in a flotation tank, the mass concentration of ore pulp is adjusted to be 30%-60%, an adjusting agent is added into the ore pulp, the pH value of the ore pulp is adjusted to be 2-4, then an inhibitor is added, stirring is conducted for 3-5 min, a collecting agent continues to be added, stirring is conducted for 10-20 min, finally a foaming agent is added, air is introduced, reverse flotation is conducted, stirring, foam scraping and washing are conducted, and quartz sand concentrate is obtained; the inhibitor is modified starch with the particle size being smaller than 500 nm and the substitution degree being 0.1-1.0, the dosage is 50-250 g / t, and carboxyl and aldehyde groups are introduced into the modified starch; quartz sand concentrate obtained after flotation is subjected to secondary acid leaching and high-temperature chlorination to obtain high-purity quartz sand, modified starch serves as an inhibitor, meanwhile, hydroxyl (-OH) in starch molecules and the surface of quartz form hydrogen bonds, the surface of the quartz is covered, adsorption of a collecting agent to the quartz is hindered, and quartz loss is reduced.

The invention discloses a fluoride-free strong-acid-free reverse flotation method for extracting a high-purity quartz sand flotation product from granite pegmatite, and belongs to the technical field of mineral flotation. The method comprises the following steps: carrying out graded crushing and ore grinding on granite pegmatite to obtain slurry to be treated; carrying out wet magnetic separation on the to-be-treated slurry to obtain ore pulp after magnetic separation and magnetic-containing minerals; the pH value of the ore pulp is not adjusted, reverse flotation is carried out in the presence of a quartz mixed inhibitor, and a feldspar product and a quartz product are obtained; the quartz mixed inhibitor is a combination of a component A and a component B, wherein the component A is selected from at least one of sodium metasilicate, sodium tripolyphosphate, sodium hexametaphosphate, carboxymethyl cellulose and salinized water glass; the component B is selected from at least one of guar gum, Arabic gum, sodium humate and citric acid. The method is free of fluorine and strong acid, green and efficient, and is a method for preparing high-purity quartz sand from pegmatite with high industrial application feasibility.

The application belongs to the technical field of battery recycling, and discloses a flotation depressant, a preparation method and application thereof. The flotation depressant comprises catechol, an oxidizing agent and a weak acid buffer solution, and the pH value of the flotation depressant is 4-6.5. The catechol and the oxidizing agent are dissolved in the weak acid buffer solution to prepare the flotation depressant, the flotation depressant can selectively inhibit the flotation of the positive electrode material, and thus the positive electrode material and the negative electrode material are separated through reverse flotation. The flotation depressant is used for flotation to obtain the positive electrode material rich in cobalt, and the grade and the recovery rate of the positive electrode material are as high as 90% and 83% respectively. The preparation method of the flotation depressant is simple, the cost is low, the flotation depressant is friendly to the environment, and the flotation depressant has a good application prospect in industrial battery recycling.

The application discloses a method for removing magnesium from phosphate ore by reverse flotation and application, and comprises the following steps: S1, crushing, screening, grading and grinding calcium-magnesium-containing phosphate ore to obtain phosphate ore powder; S2, adding water to the phosphate ore powder to adjust the slurry, and then adjusting the pH value to 4.5-9.0 to obtain a mineral slurry; S3, adding an inhibitor solution and a collector solution into the mineral slurry in sequence, and performing flotation to remove impurities to obtain tailings and phosphate concentrate; the inhibitor solution is a fulvic acid and / or fulvic acid salt solution; the application has the advantages of no phosphorus, no pollution, small dosage, mild applicable pH range, no corrosion damage to the flotation equipment and the like by using the inhibitor fulvic acid or the salt thereof to perform the flotation, and the removal of impurities of the calcium-magnesium-containing phosphate ore can be realized only by using the short process of the reverse flotation, and the flotation and impurity removal effect is good.

The present application relates to the technical field of mineral processing, and in particular, relates to a method for recovering electrically fused zirconia cyclone dust and application thereof. The method for recovering electrically fused zirconia cyclone dust comprises the following steps: mixing electrically fused zirconia cyclone dust with water to form a slurry, and then performing gravity separation roughing to obtain gravity separation roughing concentrate and gravity separation roughing tailings; performing gravity separation scavenging on the gravity separation roughing tailings to obtain gravity separation scavenging concentrate; mixing the gravity separation scavenging concentrate and the gravity separation roughing concentrate, and then performing screening to obtain oversize and undersize; performing gravity separation cleaning on the oversize to obtain gravity separation cleaning concentrate and gravity separation cleaning tailings; mixing the undersize with a collector solution and a foaming agent, and then performing reverse flotation roughing to obtain reverse flotation roughing concentrate and reverse flotation roughing tailings; and mixing the reverse flotation roughing concentrate and the gravity separation cleaning concentrate to obtain zircon concentrate. The method can efficiently recover zircon concentrate, and improve the economic added value of electrically fused zirconia cyclone dust waste.

The invention provides a preparation method of an amphoteric collecting agent and application of the amphoteric collecting agent in direct and reverse flotation of medium-low-grade phosphorite, and belongs to the technical field of mineral processing engineering. According to the amphoteric collecting agent, R can regulate and control hydrophobic chains, hydrophobic adsorption energy and molecular dispersity are optimally balanced, then the surface activity and dispersity of the amphoteric collecting agent are improved, and efficient dispersion at the temperature of 25 DEG C is achieved; the quaternary ammonium salt structure has the advantages that the cation characteristic of the quaternary ammonium salt structure is kept stable in the whole pH range and is not influenced by the environmental pH, so that a foundation is provided for effectively playing a cation collecting role in two distinct pH environments of direct flotation and reverse flotation; the problem that a traditional amine collecting agent loses positive charges under the alkaline condition and loses efficacy is solved.

A method for desilication of magnesite flotation by using a collector SAA belongs to the technical field of magnesite beneficiation and purification process, and steps are as follows: high-silicon low-grade magnesite is crushed, and ball-milled to obtain magnesite powder; at room temperature, the magnesite powder is placed in a flotation device, and deionized water is added to carry out slurry preparation; then, HCl solution is added to adjust the pH value, and stirring is carried out to obtain magnesite slurry; the collector SAA is added to the magnesite slurry, and stirring is uniformly carried out, and then one-roughing one-cleaning one-scavenging reverse flotation purification is carried out to obtain low-silicon magnesite concentrate. The application of a new collector SAA is developed, because the collector SAA has strong selective collecting property for silicon-containing minerals, the desilication process is shortened and simplified, the flotation process operation is more stable, the operation is more simple, and the collector SAA has more environmental protection compared with other chemical collectors. The ore treated by the method has low grade, and the content of SiO2 in the crude ore is high; the obtained magnesite concentrate can reach the special-grade standard of metallurgical industry.

The invention discloses a fluoride-free and acid-free method for recycling high-grade quartz from sulfide tailings, and belongs to the technical field of comprehensive utilization of mineral resources. According to the method, through the technical route of directional grading pretreatment and fluoride-free and acid-free collaborative reverse flotation separation, the separation problem of quartz and gangue minerals in the sulfide tailings is effectively solved, the quartz concentrate with the SiO2 grade larger than or equal to 90% is obtained, the cost of a beneficiation reagent per unit quartz concentrate is smaller than 50 yuan / ton, and the standard requirements of the glass and ceramic industry are met. The method not only improves the quartz recovery rate, but also effectively avoids fluoride and acid wastewater pollution in the traditional process, has good environmental protection property and economical efficiency, is suitable for large-scale industrial production, and provides a new technical solution for resource utilization of the sulfide tailings.

This invention discloses a combined collector for low-temperature iron ore flotation desilication and its application, belonging to the field of iron ore flotation technology. The combined collector of this invention is an anionic combined collector, composed of three components: component 1 is sodium oleate, component 2 is sodium linoleate, and component 3 is sodium decanoate. Components 1, 2, and 3 are each prepared into 5% (w / w) aqueous solutions. The ratio of the aqueous solutions of components 1, 2, and 3 is adjusted and mixed evenly to obtain the combined collector for low-temperature iron ore flotation desilication. This combined collector is used for reverse flotation desilication of difficult-to-process iron ores under low-temperature conditions (10℃-15℃). This combined collector overcomes the shortcomings of traditional anionic collectors, which have poor collection ability under low-temperature conditions. It reduces the pulp temperature required for reverse flotation desilication of iron ore (no heating required), effectively reducing the energy consumption of the concentrator. Furthermore, the components of the combined collector are widely available, commercially accessible, and low in cost, which is conducive to industrial-scale promotion and application.

The application is a beneficiation method for removing iron and aluminum sesquioxide from high-grade collophanite, and belongs to the technical field of mineral processing. The material obtained by crushing, superfine grinding and grading of raw ore is fed into a heavy separation operation to obtain a heavy separation concentrate and a heavy separation tailing; the heavy separation concentrate is fed into a reverse flotation magnesium removal operation buffer tank, and the heavy separation tailing is thickened, re-ground, classified, and then subjected to positive flotation desliming and positive flotation desilication, and the obtained concentrate is fed into the reverse flotation magnesium removal operation; three backwater pools are built to store positive flotation desilication backwater, reverse flotation magnesium removal backwater and heavy separation operation backwater respectively. The method mainly aims at high-grade high-sesquioxide calcareous collophanite, adopts heavy and float combined separation, divides the raw ore into a heavy separation concentrate and a heavy separation tailing through a heavy separation device, and subjects the heavy separation tailing to positive and reverse flotation to obtain a heavy tailing flotation concentrate. The separation process fully utilizes the advantages of positive and reverse flotation and heavy separation, the process flow is stable, the separation effect is good, high-quality phosphorus concentrate is realized, and low-quality phosphorus concentrate can be used.

The invention relates to a pre-separation process for reducing the phosphorus loss rate of micro-fine particle collophanite. According to the technical scheme, the method comprises the steps that phosphoric ore pulp is introduced into pre-separation operation, an emulsifying collecting agent and a foaming agent are added into the phosphoric ore pulp, pre-separation is conducted, an in-tank product I and a foam product I are obtained, and the foam product I is tailings I; the product I in the tank is introduced into reverse flotation roughing operation, a dealumination collecting agent is added into the product I in the tank for roughing, and a product II in the tank and a foam product II are obtained; and the foam product II is introduced into scavenging operation, a dealumination collecting agent is added into the product I in the tank for scavenging and roughing, a product III in the tank and a foam product III are obtained, the foam product III is tailings II, and the product III in the tank and the product II in the tank are combined into phosphate concentrate. According to the method, pre-separation is conducted on the micro-fine-particle collophanite, the problem that the micro-fine-particle collophanite is poor in separation performance is effectively solved, the grade of tailings can be greatly reduced, the phosphorus loss rate of micro-fine-particle collophanite separation is reduced, meanwhile, scavenged middlings do not enter a circulation and are directly combined into phosphorus concentrate, the phosphorus concentrate yield is further increased, the whole technological process is an open circuit, and the method is suitable for industrial production. The process is short and easy to control, and industrialization can be realized.

The application belongs to the technical field of phosphate ore dressing, and particularly discloses a method for improving double reverse flotation froth of siliceous-calcitic collophanite, which comprises the following steps: first, adjusting the pH of the phosphate ore slurry to be acidic by oxalic acid, adding a demagnesium collector to perform reverse flotation demagnesium, obtaining a demagnesium concentrate slurry, adding active carbon to the demagnesium concentrate slurry and mixing, then diluting the slurry, adjusting the pH value to 6.5-8, adding a foam inhibitor and mixing; adding a cationic collector to perform reverse flotation for removing aluminum and silicon, and performing solid-liquid separation on the reverse flotation slurry to obtain a phosphate concentrate. The method provided by the application adjusts the pH by using oxalic acid when performing reverse flotation demagnesium, and after demagnesium, the slurry is mixed with active carbon to adsorb the reagent, and a foam inhibitor is added; then, reverse flotation is performed for removing aluminum and silicon, which can change the physicochemical properties of the froth surface, greatly shorten the half-life of the froth, and ensure the ore dressing effect.

The utility model provides a foam gathering device for a tailings conveying trough in a black metal reverse flotation process, which comprises a water storage tank, a water supply pipeline communicated with the water storage tank is arranged at the top of the water storage tank, and a water outlet plate is arranged at the bottom of the water storage tank; the water supply pipeline is L-shaped and comprises a vertical pipe and a horizontal pipe, the end part of the vertical pipe is inserted into the water storage tank, a water flow distributor is arranged at the end part of the vertical pipe, the horizontal pipe is provided with an adjusting valve, and two sectional splitter plates which are symmetrically arranged are arranged below the water flow distributor. Foam in the tailing conveying groove can be gathered, repeated foaming of the foam groove caused by flowing of ore pulp and tumbling of the bubbles under the action of foaming agents is avoided, the working efficiency of the flotation tailing pulp suction machine is improved, the tailing conveying capacity of a flotation machine is guaranteed, the tailing output rate of the flotation process is increased, and the flotation efficiency is improved. Therefore, flotation production indexes are guaranteed, and the method is of great significance to production of reverse flotation processes of flotation procedures of dressing plants.

The invention belongs to the technical field of mineral processing flotation reagents, and particularly relates to an iron ore reverse flotation low-temperature collecting agent and a preparation method thereof, the iron ore reverse flotation low-temperature collecting agent comprises the following raw materials by weight: 60-100 parts of sodium aliphatate, 10-30 parts of MES, 10-30 parts of soybean oleic acid, 5-10 parts of an anionic surfactant, 1-5 parts of sodium dodecyl benzene sulfate, and 5-15 parts of a palm light component. The iron ore reverse flotation low-temperature collecting agent is wide in raw material source, good in stability, simple in manufacturing process and low in production cost; and meanwhile, the low-temperature collecting agent for reverse flotation of the iron ore is high in beneficiation efficiency at low temperature, the grade of obtained fine iron powder is high, and the yield of concentrate is increased. The iron ore reverse flotation low-temperature collecting agent does not cause harm to the environment and human bodies, belongs to a green and environment-friendly collecting agent, and has a wide application prospect.

The application discloses a harmless treatment method of aluminum electrolysis overhaul slag, and comprises the following steps: removing large particle iron through magnetic separation, recovering aluminum particles, high-temperature roasting in a clinker kiln, carbon removal through flotation, obtaining high-purity carbon through carbon acid and alkali purification, obtaining iron minerals through flotation, obtaining solid cryolite Na3AlF6 through drum drying, realizing aluminum and silicon mineral separation through reverse flotation desilication, obtaining aluminum mineral liquid, and obtaining aluminum oxide after roasting the aluminum mineral liquid.The application adopts a method of high-temperature roasting, flotation and acid-alkali treatment cooperation, high-temperature roasting makes fluoride in the overhaul slag into harmless calcium fluoride, and toxic cyanide is cracked in high temperature to generate nitrogen oxide, realizing harmless treatment of cyanide.The application realizes effective separation of carbon material, iron ore powder, aluminum ore powder and solid cryolite and other substances in the overhaul slag through multiple flotation treatments, realizes resource utilization of useful elements, opens up a new way for harmless disposal and resource utilization of the overhaul slag, and has very significant economic benefits.

The invention discloses a combined collecting agent and method for reverse flotation desiliconization of iron ore, and belongs to the technical field of ore dressing. The combined collecting agent comprises long-carbon-chain aliphatic amine and small-molecule polyamine. The long carbon chain fatty amine comprises a long carbon chain with the carbon atom number of C10-C20 and at least one active group of a primary amine group, a secondary amine group, a tertiary amine group and a quaternary ammonium group; the total number of carbon atoms of the micromolecule polyamine is C2-C8, and the micromolecule polyamine at least comprises a primary amine group and a secondary amine group. The combined collecting agent is used for reverse flotation desilicication of refractory iron ore, has good selectivity and foamability on siliceous minerals, overcomes the defects that a traditional long-carbon-chain fatty amine collecting agent is poor in selectivity and needs to be additionally added with a foaming agent, improves the iron recovery rate and the iron grade of iron ore concentrate in the actual ore flotation process, effectively reduces the dosage of agents, and reduces the cost. And the combined collecting agent is wide in component source, convenient to commercially obtain, low in cost and beneficial to industrial application and popularization.

A kind of lean oxidized ore suspension magnetization roasting comprehensive utilization method, it is related to a kind of lean oxidized ore suspension magnetization roasting to realize the method of efficient utilization of lean iron ore, also enriches rare earth ore.It includes the following steps: step 1: crushing grinding operation, step 2: pre enrichment operation, step 3: suspension magnetization roasting operation, step 4: multi-stage grinding operation, step 5: reverse flotation operation, finally obtain the iron grade 65% or more, iron recovery rate 80% or more, F content less than 0.30% iron concentrate index.The present application uses gas to suspend magnetization roasting of ore, compared with static roasting, not only high heat and mass transfer efficiency, but also solve the problem of incomplete reduction, low equipment processing capacity, high operation cost and other problems in static roasting process.The process flow of the present application is simple, equipment and system runs stably, large processing capacity, low unit energy consumption and cost, product properties are easy to control, easy to realize equipment large-scale.

The application discloses a method for continuously preparing elemental arsenic from arsenic-containing materials. The method comprises the following steps: mixing the arsenic-containing materials with carbon powder to perform reduction roasting, so as to obtain arsenic-containing steam; contacting the arsenic-containing steam with spraying water to perform condensation, so as to obtain slurry containing gamma-state elemental arsenic; and after the slurry containing gamma-state elemental arsenic is subjected to reverse flotation and impurity removal, solid-liquid separation and drying are performed, so as to obtain the elemental arsenic product. The method can not only effectively solve the problems of discontinuous work and low direct yield existing in the collection process of the existing elemental arsenic condenser, but also greatly reduce the content of impurities in the elemental arsenic, and the method is simple, fast, efficient and low in cost, and meets the industrial production.

The application discloses a reagent for promoting the flotation separation of iron ore and associated iron-containing silicates, which is used for adsorbing excessive Ca 2+ Ions in the flotation circulating water and selectively separating specularite and chlorite by reverse flotation. The reagent is sequentially added in a suitable pH environment and reverse flotation operation can effectively promote the difference in floatability between iron ore and iron-containing silicates and reduce the excessive Ca 2+ Ions in the flotation circulating water. The quality of iron concentrate can be improved by reverse flotation. The reagent has high adaptability to the flotation environment and can maintain good flotation performance in a common environment with pH=6-8. Excellent separation effect can be achieved under the condition of low dosage, and the phenomenon of excessive Ca 2+ Ions in the flotation circulating water caused by the collapse of the mining filling body into the concentrate can be effectively improved. Compared with the conventional iron ore depressant starch and dextrin used alone, the pre-adsorption reagent system can obtain better iron ore concentrate index through reverse flotation, and further reduce the gangue inclusion and dissolved Ca 2+ Ions in the flotation circulating water.

The invention relates to the technical field of mineral separation, in particular to a method for synchronously removing silicon and magnesium impurities by reverse flotation of collophanite, which comprises the following steps of: grinding raw ore, and synchronously removing the silicon and magnesium impurities in the collophanite by adopting a closed-loop process comprising primary roughing, primary scavenging, secondary concentration, middling regrinding-concentration and primary fine scavenging; wherein a compound of amino trimethylene phosphonic acid and sodium ardronate is used as an inhibitor of collophanite; a compound of 11-aminoundecanoic acid, dodecyl trimethyl ammonium bromide and sodium oleate is adopted as a synchronous reverse flotation collecting agent of the magnesium-silicon gangue minerals; flotation is carried out in a weakly alkaline ore pulp system, and the pH value of ore pulp is 8-10. According to the method, silicon-calcium gangue minerals are subjected to synchronous reverse flotation by selectively inhibiting apatite-multi-component collecting agent under weak base.

The invention relates to a beneficiation method for improving the metal recovery rate of lean magnetic and hematite, which comprises two sections of closed-loop continuous ore grinding operation, one section of weak magnetic operation, two sections of strong magnetic operation, three-time grading closed-loop ore grinding operation and flotation operation, and is characterized in that the reverse flotation operation is closed-loop reverse flotation operation consisting of one section of roughing, one section of concentration and three sections of scavenging; and combined sorting is carried out on a suspended vibration conical surface concentrator. The method has the advantages that the flotation tailings are subjected to fine separation through the suspended vibration conical surface concentrator, the iron ore concentrate recovery rate can be increased by 1-5%, the grade of the flotation tailings is reduced by 1.5% or above, and efficient recovery of poor magnetic and hematite metal is achieved.

The application discloses a combined collector and application thereof in potassium feldspar reverse flotation desilication, and belongs to the technical field of mineral processing engineering. The combined collector is composed of sodium oleate and cetyltrimethylammonium chloride. When the total dosage of the medicament is 1*10 ‑4 mol / L to 6*10 ‑4 mol / L, pH is 10.0, and the molar ratio of cetyltrimethylammonium chloride to sodium oleate in the combined collector is 1:3 to 1:2, the high-efficiency reverse flotation separation of potassium feldspar and quartz can be realized. The combined collector has the advantages of strong collecting capacity, low production cost, small medicament dosage, good selectivity, environmental protection and safety, and can balance the separation effect and economic benefits. The combined collector of sodium oleate and cetyltrimethylammonium chloride is used for the flotation separation of potassium feldspar and quartz.

The application provides a flotation upgrading method for high-ash aluminum electrolysis fine residue, and belongs to the field of solid waste resource recovery. The method comprises the following steps: ball milling the high-ash aluminum electrolysis fine residue to obtain ultra-fine particle material; slurry conditioning is performed on the ultra-fine particle material to obtain first slurry; a surfactant is added to the first slurry for pre-dispersion treatment to obtain second slurry; a composite collector and a foaming agent are added to the second slurry for roughing flotation to obtain roughing carbon slurry and roughing tailings; the roughing carbon slurry is subjected to slurry conditioning to obtain third slurry; the composite collector and the foaming agent are added to the third slurry for cleaning flotation to obtain cleaning carbon slurry and cleaning tailings; an inhibitor is added to the cleaning carbon slurry for reverse flotation to obtain low-ash fine carbon. Through the cooperation of the process steps, the fine particle mud agglomeration of the high-ash aluminum electrolysis fine residue is broken, the surface impurities are efficiently removed, and the carbon and inorganic impurities are deeply separated, so that the low-ash high-purity fine carbon is finally obtained.

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.

This invention discloses a method for the comprehensive utilization of high-silicon hematite reverse flotation tailings. Hematite reverse flotation tailings with a TFe grade between 11.0% and 15.0%, SiO2 content >78.0%, and hematite comprising more than 95% of the total iron minerals are processed through a first-stage high-intensity magnetic separation, a first-stage grinding-second-stage high-intensity magnetic separation, and a cationic reverse flotation. The resulting products are: a first-stage high-intensity magnetic scavenging concentrate with a TFe grade >25.0%, suitable for use as an iron correcting agent in cement production; a first-stage high-intensity magnetic scavenging tailings with a SiO2 purity >96.0%, suitable for use as raw material for high-purity quartz sand production; and grinding tailings suitable for use as iron and silicon correcting agents in cement production. This method achieves comprehensive utilization of high-silicon hematite reverse flotation tailings. The method has advantages such as a short process flow, low energy consumption, and high resource utilization rate, and is particularly suitable for the efficient treatment and comprehensive utilization of high-silicon hematite reverse flotation tailings.

This invention discloses a method for deep purification of medium-to-high grade magnetite concentrate to prepare ultrapure iron concentrate, relating to the field of iron ore beneficiation technology in mineral processing engineering. The method includes the following steps: medium-to-high grade magnetite concentrate is sequentially mixed, reduced in size, and impurity removed to obtain beneficiation feed; the beneficiation feed is subjected to a first-stage closed-circuit grinding and a first-stage weak magnetic roughing to remove low-grade tailings, resulting in a first-stage magnetic rough concentrate; the first-stage magnetic rough concentrate is subjected to a second-stage closed-circuit tower grinding, followed by a gradient weak magnetic separation operation consisting of weak magnetic roughing and weak magnetic cleaning, removing magnetic tailings to obtain a second-stage magnetic clean concentrate; the second-stage magnetic clean concentrate is demagnetized to obtain a demagnetized concentrate; the demagnetized concentrate is fed into a two-stage reverse flotation process (roughing and cleaning), where sodium carbonate is used as a modifier and modified dodecylamine MKC-4 is used as a collector for reverse flotation desilication under ambient temperature conditions to obtain the final ultrapure iron concentrate. This invention effectively achieves deep purification of medium-to-high grade magnetite concentrate.

This invention discloses the application of a combined collector in reverse flotation separation of lithium chlorite, belonging to the field of mineral flotation separation technology. The combined collector comprises dodecylamine, acetic acid, and sodium oleate. The mass ratio of dodecylamine, acetic acid, and sodium oleate in the combined collector is 1:0.1-0.2:9-11. This invention uses a combined collector composed of NaOL, DDA, and acetic acid as a collector for reverse flotation separation of lithium chlorite, which can effectively separate lithium chlorite from boehmite and kaolinite in clay-type lithium ores, thereby achieving pre-enrichment of clay-type lithium ores and reducing the amount of material processed in subsequent roasting for lithium extraction. The combined collector used in this invention has advantages such as wide availability of raw materials, low cost, simple preparation, convenient use, strong collecting ability, and good foaming performance.

A collector for reverse flotation, and a preparation method therefor and the use thereof. The collector for reverse flotation has a chemical structural formula as shown below: R1-NH-R2-NH2, wherein in the formula, R1 and / or R2 comprise(s) at least one of the following functional groups: a -CN3H4 functional group and a -SO3H functional group. The method comprises: S1, providing a diamine compound; and S2, introducing a -CN3 4 functional group and / or a -SO3H functional group into the diamine compound, so as to obtain a collector for reverse flotation. A diamine group and -CN3H4 in the collector for reverse flotation can enhance the interaction with a hydroxyl group, silicon, oxygen and other groups on the surface of an aluminosilicate mineral, thereby improving the selectivity of the collector for reverse flotation; -SO3H can reduce the interaction with metal ions in hard water, thereby improving the hard water resistance and enhancing the adaptability of the collector to hard water; moreover, a hydrocarbyl non-polar macromolecular chain in R1 and / or R2 enhances the hydrophobicity of the surface of mineral particles after the action of the collector, and therefore the collector for reverse flotation has an improved collecting capacity, and also has selectivity for and adaptability to minerals.

The invention relates to an Anshan type magnetite-hematite mixed iron ore diversion separation method which comprises the following steps: feeding raw ore into a first-section closed circuit grinding system and a second-section closed circuit grinding system, performing overflow feeding of a second-section cyclone into first-section barrel type low-intensity magnetic separation operation to obtain first-section low-intensity magnetic concentrate and tailings, performing second-section electromagnetic concentration operation on the first-section low-intensity magnetic concentrate to obtain first-section low-intensity magnetic concentrate and tailings, and performing second-section electromagnetic concentration operation on the first-section low-intensity magnetic concentrate; the first-section weak magnetic tailings and the second-section electromagnetic concentration tailings are combined and fed into high-intensity magnetic separation operation to obtain high-intensity magnetic concentrates and tailings, the high-intensity magnetic concentrates are fed into reverse flotation operation to obtain reverse flotation concentrates and tailings, and the reverse flotation concentrates and the electromagnetic concentration concentrates are combined to serve as final qualified iron concentrates. The strong magnetic tailings and the reverse flotation tailings are combined and discharged as final tailings. According to the method, easy-to-separate strong magnetic magnetite is recovered through a single low-intensity magnetic separation process, weak magnetic hematite is recovered in combination with a strong magnetic-reverse flotation process, and reselection operation is not needed, so that the separation process is simplified, the separation efficiency is improved, and the production cost is reduced.

The present disclosure belongs to the field of phosphogypsum treatment and resource utilization, and particularly relates to a method for decolorizing and whitening phosphogypsum. The method for decolorizing and whitening phosphogypsum provided by the present disclosure removes organic matter from phosphogypsum by reverse flotation using a decolorizing collector, then precipitates soluble phosphorus and fluorine by adjusting pH, and separates insoluble phosphorus and fluorine precipitates, undecomposed phosphate rock and quartz by two cyclone grading, thereby obtaining phosphogypsum CaSO4·2H2O with high content and good whiteness. The decolorizing collector of the present disclosure mainly consists of diesel oil, a foaming agent and naphthenic acid soap. The diesel oil makes the ore slurry hydrophobic, while the naphthenic acid soap contains a polar carboxylic acid group at one end and a cycloalkane group connected to a methylene group at the other end, which has very strong hydrophobicity and strong adsorption to charged slime and fine particles of carbon in the decolorizing process. Meanwhile, the decolorizing collector also contains a foaming agent, which provides a large amount of stable foam during reverse flotation, thereby achieving better decolorizing and desliming effects.