221 results about "Reverse flotation" patented technology

The invention discloses a magnetic separation-flotation combined stepped deep iron removal method for granite tailings. According to the method, after granite tailings are subjected to ore grinding treatment, magnetic separation impurity removal, black and white mica ore removal through reverse flotation and fine ferrodolomite ore removal through reverse flotation are conducted in sequence, after the pH of reverse flotation tailings is adjusted, fluoride-free and acid-free separation is conducted, low-iron quartz concentrate and feldspar rough concentrate are obtained, the feldspar rough concentrate is subjected to regrinding and secondary magnetic separation impurity removal, and the low-iron quartz concentrate and the feldspar rough concentrate are obtained. And low-iron feldspar concentrate is obtained. According to the method, no strong acid is involved in the whole process, the technical problem that in the prior art, strong acid is introduced in quartz and feldspar flotation, and consequently waste water and waste liquid pollution is caused is fundamentally solved, and efficient and deep removal of iron impurities in the granite tailings is achieved through the magnetic separation pre-enrichment-three-section flotation separation-step deep iron removal technology. And the overall removal efficiency of the iron impurities is remarkably improved, and comprehensive utilization of granite tailings resources is achieved.

The invention provides a method for quality-divided regeneration of silicon dioxide from ardealite by using a flotation and acid leaching coupling melting purification technology, and relates to the technical field of regeneration of silicon dioxide from ardealite, the method comprises the following steps: S1, adding a nonionic collecting agent into ardealite ore pulp for reverse flotation to obtain rough machining ardealite; s2, carrying out direct flotation on the rough machining ardealite obtained in the step S1 to obtain silicon ardealite tailings; s3, drying and crushing the silicon phosphogypsum tailings, uniformly mixing the silicon phosphogypsum tailings with a washing agent, and acidizing to remove impurities, so as to obtain silicate; and S4, adding the silicate obtained in the step S3 into a dissolving agent, reacting to obtain silicon dioxide colloid, and calcining to obtain silicon dioxide with the purity as high as 99.9%.

The invention discloses a separation reagent for promoting flotation of iron ore and associated iron-containing silicate, which is used for adsorbing excessive Ca < 2 + > ions in flotation circulating water and selectively separating specularite and chlorite for reverse flotation. The agents are sequentially added in a proper pH environment and are subjected to reverse flotation operation, floatability difference between iron ore and iron-containing silicate can be effectively promoted, redundant Ca < 2 + > in flotation circulating water is reduced, and the quality of iron ore concentrate can be improved through a reverse flotation means. Compared with the prior art, the flotation agent has the advantages that the flotation agent is high in flotation environment applicability, good flotation performance can be kept in a common environment with the pH being 6-8, meanwhile, the excellent separation effect can be achieved under the low-dosage condition, and the phenomenon that Ca2 + ions are excessive due to the fact that mining filling bodies fall and are mixed into concentrate can be effectively improved. Compared with single use of traditional iron ore inhibitor starch and dextrin, the method has the advantages that better iron ore concentrate indexes can be obtained through a reverse flotation means by using a pre-adsorption agent system, and meanwhile, the phenomenon that excessive Ca < 2 + > ions are entrained and dissolved out from concentrate gangue is further reduced.

The invention belongs to the technical field of beneficiation of vanadium-containing minerals, and discloses a beneficiation method for removing calcium and enriching vanadium from vanadium-containing shale through gravity-flotation combined separation, which comprises the following steps: S1, crushing raw ore, adding water and ball-milling to prepare ore pulp, and carrying out gravity separation on the ore pulp through a spiral launder to obtain a coarse-grained vanadium ore product and a fine-grained vanadium ore product; s2, water is added into the coarse-fraction vanadium ore product for size mixing, reverse flotation operation is carried out, and vanadium concentrate I and tailings I are obtained; s3, the fine-fraction vanadium ore product is firstly subjected to desliming treatment, vanadium concentrate II and deslimed minerals are obtained, water is added into the deslimed minerals for size mixing, then direct flotation operation is conducted, and vanadium concentrate III and tailings II are obtained; and S4, the vanadium concentrate I, the vanadium concentrate II and the vanadium concentrate III are combined to obtain final concentrate, and the tailings I and the tailings II are combined to obtain final tailings. The method has the characteristics of high V recovery rate, good Ca separation effect, simple process and environmental friendliness.

A magnetite-hematite micro-fine refractory iron ore separation method, comprising the specific steps: 1) performing crushing and screening on micro-fine-particle magnetite-hematite mixed raw iron ore and performing grinding and screening on same to obtain an ore grinding product; 2) performing weak magnetic and strong magnetic grading operation on the ore grinding product to obtain magnetic separation concentrate and magnetic separation tailings; 3) performing nanobubble pretreatment on a flotation reagent and then adding the pretreated flotation reagent to the magnetic separation concentrate to obtain the flotation feed mineral slurry; and 4) performing ultrasonic pretreatment on the flotation ore feeding slurry, and then performing reverse flotation closed-loop operation to obtain reverse flotation concentrate and reverse flotation tailings.

The invention discloses a combined beneficiation process for weathering crust type high-mud-content magnetic, red and brown mixed iron ore, which comprises the following steps: carrying out crushing, dry screening, ore washing, high-pressure roller milling and wet screening on raw ore to obtain selected products with qualified granularity, and carrying out low-intensity magnetic separation on the selected products to obtain magnetic separation iron ore concentrate and low-intensity magnetic separation tailings; the low-intensity magnetic separation tailings are subjected to high-intensity magnetic separation, rotational flow classification and chute gravity separation to obtain gravity separation iron ore concentrate, chute gravity separation tailings and rotational flow classification overflow and high-intensity magnetic scavenging tailings, and the chute gravity separation tailings are subjected to ore grinding classification and high-intensity magnetic roughing to obtain high-intensity magnetic roughing concentrate and high-intensity magnetic roughing tailings; the strong magnetic roughing concentrate and the rotational flow grading overflow are combined and then subjected to reverse flotation, flotation iron concentrate and reverse flotation total tailings are obtained, and a reverse flotation collecting agent MX is a mixture of ether amine, ether diamine and quaternary ammonium salt according to the molar ratio of 1: (1.2-2.0): (1.5-2.5). The method has the advantages of being good in separation effect, stable and reliable in technological process, high in applicability, relatively low in mineral separation energy consumption and cost, extremely small in environmental pollution and high in comprehensive economic benefit.

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 beneficiation method for recovering iron ore concentrate from superfine hematite mud, which comprises the following steps: carrying out strong magnetic roughing on the superfine hematite mud to obtain strong magnetic roughed iron ore concentrate, and discharging strong magnetic roughed tailings; the strong magnetic roughing tailings are subjected to open-circuit strong magnetic scavenging twice, and first strong magnetic scavenging concentrate and second strong magnetic scavenging concentrate are obtained respectively; the strong magnetic roughing iron ore concentrate, the strong magnetic scavenging concentrate 1 and the strong magnetic scavenging concentrate 2 are combined and then fed into reverse flotation roughing operation, and the reverse flotation roughing operation is one-time roughing and three-time open-circuit scavenging. According to the method, full-open-flow fine sorting is adopted in strong magnetic separation and reverse flotation, strong magnetic roughing and scavenging bulk concentrates are subjected to flotation, reverse roughing and scavenging concentrates are combined into total concentrates, under the condition that it is guaranteed that the iron grade of the iron concentrates is larger than 63.0%, the iron ore concentrate recovery rate is increased to the maximum extent, the full-flow recovery rate is 72% or above, and the iron ore concentrate recovery rate is increased to the maximum extent. The contradiction between improvement of the iron ore concentrate grade and great reduction of the recovery rate is solved to the maximum extent, and an unexpected technical effect is achieved.

The invention relates to a reverse flotation collecting agent and a preparation method and application thereof, and belongs to the technical field of bauxite reverse flotation desilicication. The reverse flotation collecting agent has a chemical structural formula as shown in a formula (I): R1-NH-R2-NH2. In the formula (I), R1 and / or R2 comprises at least one of the following functional groups: a-CN3H4 functional group and a-SO3H functional group. A diamine group and-CN3H4 in the reverse flotation collecting agent can enhance the action with groups such as hydroxyl, silicon and oxygen on the surface of the aluminosilicate mineral, and the selectivity of the reverse flotation collecting agent is improved; the interaction between-SO3H and metal ions in hard water can be reduced, the hard water resistance is improved, the adaptability of the collecting agent in the hard water is improved, meanwhile, alkyl non-polar macromolecular chains in R1 and / or R2 strengthen the hydrophobicity of the surfaces of ore grains after the collecting agent acts, and the collecting capacity of the reverse flotation collecting agent is improved. Therefore, the reverse flotation collecting agent gives consideration to selectivity and adaptability to minerals.

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 invention discloses an efficient beneficiation method for niobium ore, and belongs to the technical field of beneficiation. The method comprises the steps that raw niobium ore is crushed and then subjected to weak magnetic treatment to remove strong magnetic iron ore, weak magnetic tailings are subjected to desliming treatment and then subjected to strong magnetic treatment, and strong magnetic concentrate and strong magnetic tailings are obtained; the strong magnetic concentrate is subjected to desilicication reverse flotation, and desilicication tailings are obtained; the desilicication tailings are subjected to dehydration, reagent removal and desliming and then subjected to niobium flotation I, and niobium concentrate I is obtained; the strong magnetic tailings are subjected to niobium flotation II, and niobium concentrate II is obtained; and after the niobium concentrate II is subjected to dehydration and reagent removal treatment, upgrading flotation III is carried out, and niobium concentrate III is obtained. According to the method, according to the mineral composition characteristics of the niobium ore, magnetic separation is firstly carried out, and different flotation methods are respectively adopted for magnetic niobium-containing minerals and non-magnetic niobium-containing minerals for enrichment of the niobium ore, so that not only is the total recovery efficiency of the niobium ore improved, but also the niobium concentrate grade is improved, and the reagent consumption is reduced.

The application discloses a method for separating aluminosilicate minerals and purifying quartz sand under neutral conditions and application thereof. The method for separating aluminosilicate minerals and purifying quartz sand under neutral conditions adopts one or more times of reverse flotation operations, and the reverse flotation operation comprises the following steps: adding a quartz depressor into quartz raw sand slurry or low-aluminum-content fine quartz sand slurry obtained through previous reverse flotation operation and mixing; then adding an aluminosilicate mineral collector and mixing; subsequently, adding a foaming agent under the condition of air agitation and stirring, and performing quartz reverse flotation, during which, stirring is kept and bubbles are scraped; and finally, washing the remaining slurry to obtain low-aluminum-content fine quartz sand. The reverse flotation process of the application is performed under neutral conditions, avoids the use of traditional strong acid and strong alkali, and further reduces the harm of the purification process to production equipment, ecological environment and operating personnel.

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 invention provides a flotation method for separating residual slope product titanium placer, and belongs to the field of beneficiation, the flotation method comprises the following steps: grinding a titanium placer flotation raw material until the titanium placer flotation raw material accounts for 60-70% by mass of-0.074 mm, preparing the titanium placer flotation raw material into ore pulp with the concentration of 25-30%, adding a gangue collecting agent for reverse flotation roughing, and separating to obtain a foam product and an in-tank product; a gangue inhibitor and an ilmenite collecting agent are added into a product in the groove for direct flotation roughing, and roughing rough concentrate and roughing tailings are obtained; the roughing rough concentrate is subjected to three times of concentration to obtain titanium concentrate; a gangue inhibitor and an ilmenite collecting agent are added into the roughing tailings for scavenging, and scavenged concentrate and scavenged tailings are obtained; and the foam product and the scavenging tailings are combined, and tailings are obtained. The reverse flotation desliming process is adopted, it is guaranteed that gangue minerals with good floatability in an ore sample are removed as far as possible, the adverse effect of the gangue minerals on ilmenite flotation is reduced, recycling of fine-fraction ilmenite is effectively enhanced, and the TiO2 recycling rate is increased under the action of the efficient inhibitor and the collecting agent.

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 invention relates to a combined inhibitor for reverse flotation magnesium removal of medium-low grade phosphorite and application thereof. The combined inhibitor comprises sodium sulfate, 1, 2, 4-butanetricarboxylic acid and sulfuric acid. The application method comprises the following steps: grinding raw ore, adding water and mixing to obtain ore pulp; the pH of the ore pulp is adjusted, then the combined inhibitor is sequentially added and mixed, then a collecting agent is added and mixed, flotation is conducted, and phosphate concentrate and phosphate tailings are obtained; the flotation process comprises one-time rough flotation, at least one-time fine flotation and at least one-time scavenging; the combined inhibitor provided by the invention is good in calcium and magnesium interference resistance and high in selectivity, the dosage of sulfuric acid is remarkably reduced, the pH value of ore pulp is increased, magnesian gangue in phosphorite is effectively removed through the synergistic effect of all the components, the grade of phosphate concentrate is increased, meanwhile, the recovery rate is high, and the combined inhibitor has good industrial application prospects.

The invention discloses a low-temperature combined collector for flotation and desilicication of iron ore and application of the low-temperature combined collector, and belongs to the technical field of iron ore flotation. The combined collecting agent is an anion combined collecting agent and is prepared from three components, the component 1 is sodium oleate, the component 2 is sodium linoleate, the component 3 is sodium caprate, the component 1, the component 2 and the component 3 are prepared into aqueous solutions with the mass concentration being 5% respectively, the proportion of the aqueous solutions of the component 1, the component 2 and the component 3 is adjusted, the aqueous solutions of the component 1, the component 2 and the component 3 are mixed to be uniform, and the low-temperature type iron ore flotation desilicication combined collecting agent is obtained. The combined collecting agent is used for reverse flotation desilicication of refractory iron ore at the low temperature of 10-15 DEG C. According to the combined collecting agent, the defect that a traditional anion collecting agent is poor in collecting capacity under the low-temperature condition is overcome, the ore pulp temperature needed by iron ore reverse flotation desilicication is reduced (heating is not needed), the energy consumption of a dressing plant is effectively reduced, and the combined collecting agent is wide in component source, convenient to commercially obtain, low in cost and beneficial to industrial application and popularization.

The invention discloses a method for preparing high-strength ceramsite through reverse flotation decarburization and desulfurization of coal gangue, which comprises the following steps: (1) crushing and finely grinding the coal gangue to obtain finely ground coal gangue; (2) mixing the finely ground coal gangue with water to obtain coal gangue ore pulp; (3) adding an inhibitor, a collecting agent and a foaming agent into the coal gangue ore pulp, carrying out reverse flotation decarburization and / or desulfurization on the coal gangue, and carrying out suction filtration and drying on precipitates in a flotation tank to obtain a decarburized and / or desulfurized coal gangue filter cake; (4) crushing and finely grinding the decarbonized and / or desulfurized coal gangue filter cake, pelletizing after fine grinding, pelletizing while adding water to obtain a ceramsite green body, and screening the green body to obtain a green body with qualified granularity for subsequent ceramsite firing; (5) paving backing materials and rim charges on a trolley, and carrying out material distribution, drying, preheating, roasting and cooling treatment on the green bodies with qualified particle sizes to obtain roasted pellets; and (6) screening the roasted pellets obtained in the step (5) to obtain roasted pellets with qualified granularity, namely the high-strength ceramsite.

The present invention relates to a combined inhibitor for lead-zinc oxide ore in lead-zinc sulfide tailings and its application, belonging to the technical field of lead-zinc oxide ore beneficiation. The combined inhibitor comprises sodium fluorosilicate, sodium sulfide, and sodium humate, wherein the mass ratio of the sodium fluorosilicate, sodium sulfide, and sodium humate is 2:5:1. The present invention also includes applying the combined inhibitor to a reverse flotation recovery process for lead-zinc oxide ore in lead-zinc sulfide tailings. The combined inhibitor and reverse flotation process employed in the present invention achieve simultaneous recovery of lead oxide and zinc oxide while ensuring flotation recovery efficiency, and have the advantages of a simple process and low equipment investment.

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 novel ardealite double-reverse flotation purification system and process, and the system comprises a size mixing tank which is used for mixing ardealite slurry; the first dosing container is communicated with the downstream of the size mixing tank; the first reverse flotation column is communicated with the downstream of the first dosing container, and a first outer guide hopper is arranged outside the top end of the first reverse flotation column and used for guiding materials overflowing from the top of the first reverse flotation column outwards; the second dosing container is communicated with the downstream of the first reverse flotation column; the second reverse flotation column is communicated with the downstream of the second dosing container, and a second outer guide hopper is arranged outside the top end of the second reverse flotation column and used for guiding materials overflowing from the top of the second reverse flotation column outwards; and the first filter press is communicated with the downstream of the second reverse flotation column and is used for carrying out filter pressing on materials at the bottom of the second reverse flotation column.

This invention discloses a low-temperature reverse flotation collector for collophane and its preparation method, belonging to the field of collophane flotation technology. The low-temperature reverse flotation collector for collophane of this invention is prepared from the following raw materials: linoleic acid, linolenic acid, and gallic acid. This invention generates a low-temperature reverse flotation collector for collophane containing two OH groups and one COOH group through an esterification reaction of linoleic acid, linolenic acid, and gallic acid. In acidic pulp, the flotation recovery rate is 20-50% lower than before the esterification reaction, and the dosage is significantly improved, resulting in a substantial increase in concentrate P2O5 grade and recovery rate. Furthermore, the low-temperature reverse flotation collector for collophane can be used for flotation at a low temperature of 5-10℃. The flotation foam generated during the flotation process has a short duration, low foam stability, and is easily defoamed, which is beneficial for continuous operation and tailings recovery.

The present invention relates to a collector for collecting carbon and silicon by reverse flotation, and a preparation method and use thereof. The collector comprises a cyclohexane acid imidazoline derivative, mineral oil and ether alcohol. The use comprises using the collector to reverse flotate and remove carbon and silicon from phosphogypsum waste residue, specifically as follows: mixing and stirring the phosphogypsum waste residue slurry with the collector, and performing reverse flotation operation to obtain silicon-containing carbon tailings and phosphogypsum concentrate. The reverse flotation collector can realize an economical and efficient phosphogypsum mixed flotation and silicon-carbon removal process in a strongly acidic environment, which not only improves the grade and whiteness of phosphogypsum, but also ensures a high recovery rate of phosphogypsum, and provides qualified raw materials for multi-path large-scale utilization of phosphogypsum.

The invention discloses equipment and a method for producing a potassium chloride reverse flotation reagent by adopting a granular copper-nickel catalyst, and relates to the technical field of salt lake chemical engineering. The equipment comprises a reaction kettle, a stirring shaft, a stirring paddle, a stirring basket, an upper stirring paddle, a lower stirring paddle and the like; on the basis of a powder catalyst, macroporous pseudo-boehmite and an acid solution are added, the powder catalyst is prepared into particles, and the particle type catalyst is matched with special production equipment to be used for producing the potassium chloride reverse flotation reagent. Compared with the prior art, the invention has the beneficial effects that the granular catalyst is combined with the special production equipment provided by the invention, the technical effect equivalent to the activity of a powder catalyst can be realized, the content of the target product is 85% or above, the highest content reaches 93.07%, the content of copper and nickel in the product is 10 ppm or below, the harm to salt pan brine is greatly reduced, and the production cost is reduced. The problem that flotation reagents and catalysts are difficult to separate which puzzles enterprises for many years is solved.

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 discloses a combined activating agent suitable for phosphorite reverse flotation and application of the combined activating agent, and belongs to the technical field of phosphorite flotation. The combined activating agent comprises acid red 27 and propionic acid, the combined activating agent can generate a strong activation effect on dolomite within the pH range of 3-7, meanwhile, apatite flotation is not promoted, and therefore flotation separation of dolomite and apatite is achieved. The mass percent of the acid red 27 in the combined activating agent is 30%-60%, the dosage of the combined activating agent is 500-1000g / t, the reaction time of the combined activating agent and phosphorite pulp is 3-15 minutes, after the combined activating agent is activated, a hydroximic acid and butanol mixed collecting agent is used for flotation, meanwhile, a No.2 oil foaming agent is added, and the flotation time is 3-15 minutes. Phosphorus concentrate with the P2O5 grade of 27.81%-28.75% and the recovery rate of 85.33%-90.18% can be obtained through the reverse flotation closed-loop process of one-time roughing and one-time concentration.