93 results about "Cassiterite" patented technology

The invention provides a beneficiation method of micro-fine particle low-grade tin ore. The beneficiation method comprises the following steps: (1) feeding; (2) physical reselection: a centrifugal drum of the physical concentrator rotates horizontally, and ore pulp is fed to the inner surface of the drum by an ore feeding device and is driven by the centrifugal drum to rotate along with the drum; (3) thickening; (4) the flotation process comprises the following steps: S1, feeding; s2, pulp mixing, wherein a flotation reagent is added into the ore pulp; the flotation reagents comprise a desulfurization flotation reagent and a floating tin flotation reagent, the desulfurization flotation reagent is added into the ore pulp for desulfurization flotation, and then the floating tin flotation reagent is added for floating tin flotation; s3, air inflation is carried out; s4, separating; and (5) secondary concentrate upgrading is conducted, specifically, flotation concentrate enters the physical concentrating machine again, secondary upgrading is conducted, and tin concentrate is obtained. According to the beneficiation method, the tin-containing grade of a tin concentrate product reaches 50% or above, and the comprehensive recovery rate reaches 55% or above.

The invention discloses a reselection-flotation synergetic recovery stage grading process for tin-containing spodumene ores, stage separation is realized by adopting a reselection-flotation synergetic beneficiation method, the process is efficient and green, ore properties such as specific gravity, granularity and dissemination relationship of the tin-containing spodumene ores are fully utilized, metal loss of lithium and tin caused by over-grinding is avoided, and the quality of the tin-containing spodumene ores is improved. And meanwhile, recovery of spodumene and associated cassiterite in coarse and fine particle fractions is achieved through the dense medium mineral separation, reselection and flotation processes, minerals in different particle fractions are recovered in a stepped mode under the optimal equipment environment and technological parameters, and valuable metal resources such as tin and lithium are recovered to the maximum extent. In addition, the invention creatively provides the method for recycling tin through reselection of the lithium concentrate smelting slag, and full recycling of resources can be truly achieved.

The application discloses a multi-metallic sand tin ore beneficiation process, adopts the equal floatation-mixed floatation-gravity separation backwater process, lead concentrate yield is 0.39%, lead grade is 16.62%, recovery rate is 15.93%; zinc concentrate yield is 1.08%, zinc grade is 39.32%, zinc recovery rate is 46.92%, the gravity separation indexes are as follows: tin concentrate yield is 0.39%, tin content is 40.57%, tin recovery rate is 51.66%; low-grade tin concentrate yield is 0.51%, tin content is 3.17%, tin recovery rate is 5.28%. The beneficiation process recovers lead, zinc and tin in the sand tin ore, has high beneficiation indexes and good beneficiation effect.

A combined beneficiation method for low-grade, high-mud-content and fine-grained tin tailings, comprising the following steps: (1) gravity pre-enrichment: preparing a pulp from raw ore having a particle size of -0.074 mm, and then using a suspended vibration concentrator to perform primary roughing pre-enrichment on the obtained ore pulp to obtain a pre-enriched product; (2) desulfurization flotation: concentrating and dehydrating the pre-enriched product, and if the pre-enriched product contains sulfur, performing desulfurization flotation, wherein the desulfurization flotation comprises roughing, scavenging and concentration, and if the pre-enriched product does not contain sulfur, directly entering step (3); (3) cassiterite flotation: performing cassiterite flotation on the sulfur-free pre-enriched product or desulfurized product in step (2), wherein the cassiterite flotation comprises roughing, scavenging and concentration; and (4) gravity concentration: using a gravity concentrator to separate the finally concentrated product in the cassiterite flotation in step (3) to obtain high-grade tin concentrate and low-grade tin concentrate. The beneficiation method has the advantages of reducing the costs, and improving the beneficiation recovery rate and the product quality.

The invention discloses a cassiterite reselection-multi-gradient flotation combined enhanced recovery method. The method comprises the following steps that cassiterite raw ore is crushed and then subjected to pre-desliming and wet ball milling; carrying out magnetic separation on the obtained ore grinding product; performing primary table separation on the non-magnetic product to obtain table concentrate 1 and table middling 1; carrying out secondary table separation on the obtained table middling 1 to obtain table concentrate 2 and table middling 2; the table concentrate 1 and the table concentrate 2 are combined to serve as final table concentrate; the obtained table middling 2 is reground, then one-time roughing, two-time concentration and two-time scavenging are carried out, and flotation concentrate 1 is obtained; the obtained mud table tailings 2 are combined and then subjected to one-time roughing, three-time concentration and two-time scavenging, and flotation concentrate 2 is obtained; and the flotation concentrate 1 and the flotation concentrate 2 are combined to serve as final flotation concentrate. According to the method, the cassiterite is separated through combination of gravity separation, classification and flotation, the high-grade tin concentrate is obtained through gravity separation of the table concentrator, then the low-grade tin concentrate is obtained through separation by adopting different flotation processes and reagent systems after middlings of different size fractions are classified, and the comprehensive recovery rate of raw ore is increased.

The invention discloses a beneficiation method for recovering micro-fine particle cassiterite and fluorite from cassiterite tailings, and belongs to the technical field of beneficiation. The method comprises the steps that cassiterite tailings are subjected to reselection, obtained reselected bulk concentrate is subjected to ore grinding and then sequentially subjected to magnetic separation iron removal and flotation desulfurization, and the desulfurized tailings are subjected to cassiterite flotation with metal ion modified water glass with the valence higher than bivalent as an inhibitor and a metal-based multi-ligand organic complex as a collecting agent, so that cassiterite concentrate and flotation tailings are obtained; and the flotation tailings and the gravity separation tailings are combined, water glass or acidified water glass serves as an inhibitor, aliphatic carboxylic acid and heavy alkyl benzene sulfonate serve as a composite collecting agent, fluorite flotation is conducted, and fluorite concentrate is obtained. According to the method, the technological process is simple, the ore grinding and agent cost can be remarkably reduced, and selective separation of cassiterite and fluorite is achieved while efficient recycling of micro-fine particle cassiterite is achieved.

The application discloses a high-efficiency grinding process for tin ore, which effectively separates coarse particles and makes them enter into sand by precisely controlling the pressure of a cyclone in a pressure range of 0.02-0.04 MPa, can effectively ensure that the content of +0.35 mm particles in overflow of the first-stage cyclone is strictly less than 5%, realizes the target of no coarse particles in the overflow, controls the ore concentration to be 30-40% at the same time, ensures the stable flow state of the ore slurry in the cyclone, makes the cyclone more accurately perform the grading operation, reduces the concentration of the sand in the first-stage cyclone, and ensures that the ore entering into the ball mill is basically +1 mm particle size ore through efficient screening, thereby reducing the over-grinding phenomenon of the ball mill, makes the material with a particle size of -0.074 mm particle grade stable between 50-55%, and the proportion of the material with a particle size of -0.01 mm particle grade is about 18%, thereby improving the tin recovery rate, and improving the economic benefit and resource utilization rate of the tin ore beneficiation.

This invention discloses an efficient separation and beneficiation method for scheelite, wolframite, and cassiterite in a tungsten-tin mixed concentrate, comprising the following steps: (1) pre-treatment by grinding, flotation desulfurization, and weak magnetic separation to remove iron from the tungsten-tin mixed concentrate to obtain weak magnetic tailings; (2) concentration and drying of the weak magnetic tailings obtained in step (1) followed by electrostatic separation to obtain electrostatic concentrate and electrostatic tailings; (3) stirring and slurry conditioning of the electrostatic concentrate obtained in step (2) followed by strong magnetic separation to obtain strong magnetic concentrate and strong magnetic tailings; stirring and slurry conditioning of the electrostatic tailings obtained in step (2) followed by scheelite upgrading flotation to obtain scheelite concentrate and scheelite flotation tailings. Based on the differences in conductivity, magnetism, and flotation properties of scheelite, wolframite, and cassiterite, this invention employs a “cassiterite / wolframite electrostatic separation-wolframite / cassiterite strong magnetic separation-scheelite upgrading flotation” process to achieve efficient separation of wolframite, scheelite, and cassiterite.

The invention provides a beneficiation method for recovering copper and silver from complex tin-silver-copper-zinc polymetallic ore. The beneficiation method comprises the steps of rough grinding, copper-silver optimal flotation, zinc-sulfur mixed flotation, classification, concentration, ore grinding, zinc-sulfur separation, shaking table reselection, middling regrinding, flotation desulfurization, copper-silver-sulfur separation and the like. Aiming at the characteristics of coarse cassiterite inlaying and fine and non-uniform sulphide ore inlaying, the problem that sulphide ore and cassiterite in tin polymetallic ore are difficult to recover at the same time is solved through the processes of quality classification, stage grinding and centralized treatment. According to the method, the tin recovery rate is guaranteed, meanwhile, copper and silver which are wide and fine in disseminated particle size are recovered in a segmented mode, the grade of the zinc concentrate is improved, efficient comprehensive recovery of valuable metal such as tin, silver, copper and zinc is achieved, the resource economic benefits are maximized, and the problems of excessive grinding of tin and loss of copper and silver are effectively solved.

The invention discloses a method for screening ore-contained rock masses in a tungsten-tin ore prospecting prospective area, and a tungsten-tin ore metallogenic specificity distinguishing system and a screening method are constructed on the basis of fusing rock ore total rock geochemical data, a partial fusion numerical simulation experiment, a Rayleigh shunt numerical simulation experiment and a crystal porridge body model. According to the method, through quantitative analysis of essential differences of the ore-containing rock mass, the lean ore rock mass and the non-ore-containing rock mass in the magma differentiation degree, rapid and accurate screening of the hidden mineralized rock mass in the prospecting distant view area is achieved, and the ore-containing rock mass with the most mineralization potential can be rapidly screened out from the non-ore-containing rock mass or the lean ore rock mass.

The invention relates to the technical field of mineral recycling, in particular to a beneficiation method for recycling fine cassiterite from tin-containing tailings. According to the beneficiation method for recycling the micro-fine cassiterite, through screening, spiral chute, table shaking and centrifugation combination and process optimization, efficient pre-enrichment of the micro-fine cassiterite can be achieved, and by throwing and removing slime in advance, the adverse effect of the slime on the subsequent beneficiation process is avoided from the source.

The invention discloses a beneficiation method for efficiently separating scheelite, wolframite and cassiterite in tungsten-tin bulk concentrate. The beneficiation method comprises the following steps that (1) the tungsten-tin bulk concentrate is firstly subjected to ore grinding, flotation desulfurization and magnetic separation iron removal, and iron-removed tailings are obtained; (2) performing scheelite normal-temperature flotation on the iron-removed tailings to obtain scheelite rough concentrate and scheelite flotation tailings; (3) the scheelite rough concentrate is subjected to flotation upgrading, scheelite upgraded rough concentrate is obtained, and wolframite and cassiterite are deeply inhibited in the flotation upgrading process; the scheelite quality-improved rough concentrate is subjected to quality-improved fine selection, and scheelite concentrate is obtained; (4) the scheelite flotation tailings are subjected to magnetic separation to achieve separation of wolframite and cassiterite, and wolframite concentrate and tin rough concentrate are obtained; and (5) gangue minerals are removed from the tin rough concentrate through electric separation, and tin concentrate is obtained. According to the beneficiation method, tungsten and tin resources can be efficiently and comprehensively recycled.

The invention discloses a skarn tin ore exploration method and system, and is applied to the technical field of tin ore exploration. Comprising the following steps: collecting geologic feature data and tin ore distribution data of a mined skarn type tin ore area, and constructing a tin ore exploration database; training a metallogenic prediction model; dividing a to-be-explored mining area into a plurality of sub-areas, collecting geologic feature data of each sub-area, and inputting the geologic feature data into the metallogenic prediction model for prediction; a key exploration sub-region is judged according to the prediction result, and the tin ore distribution condition is explored in the key exploration sub-region in a physical exploration mode; and establishing a three-dimensional physical model based on the geological feature data of the to-be-explored mining area, and synchronizing the tin ore distribution condition to the three-dimensional physical model of the to-be-explored mining area. According to the method, the key exploration sub-region is predicted through the metallogenic prediction model, the accuracy of the prediction result can be improved, the exploration cost is reduced, and a reference is provided for skarn type tin ore exploration.

A polymetallic low-grade tin ore beneficiation process, comprising the following steps: 1) grinding; 2) classification; 3) magnetic separation: a first middling, a second rough concentrate, and a second middling are combined for wet magnetic separation to obtain magnetic tailings and a magnetic concentrate, a flotation agent is added to the magnetic tailings for conditioning, then flotation is performed to obtain a flotation concentrate and flotation tailings, and the flotation tailings are thickened, ground, and returned to a first-stage shaking table for re-beneficiation; 4) bulk flotation of sulfide minerals; and 5) re-beneficiation of a tin concentrate using a shaking table.

The invention relates to a cassiterite flotation collecting agent and application thereof, and belongs to the technical field of mineral flotation. The collecting agent is di (2-ethylhexyl) phosphate, the molecular structure of the collecting agent has a plurality of hydrophobic branched chains and phosphate groups, the adsorption strength of the collecting agent on the cassiterite surface can be remarkably enhanced, and the hydrophobic performance of the mineral surface is effectively improved. And high-selectivity separation of cassiterite and common gangue minerals can be realized in an alkalescent to neutral ore pulp environment. The collecting agent is environmentally friendly, low in toxicity, good in dispersity and chemical stability, easy to disperse under the ore pulp stirring condition, convenient to use, high in collecting efficiency, excellent in selectivity and beneficial to obtaining high-grade cassiterite concentrate with the high recovery rate.

The invention relates to a combined separation and recovery process for low-grade associated tantalum-niobium-tin ores. The combined separation and recovery process comprises the following steps: feeding raw ores into a linear sieve for sieving; oversize products are fed into a first-section ball mill, and ore is discharged into a spiral classifier for classification; graded returned sand is returned to the second-stage ball mill for regrinding, graded overflow is fed into a weak magnetic roller, iron-removed non-magnetic ore pulp is fed into a high-frequency coarse screen, oversize products are fed into the second-stage ball mill for fine grinding, undersize products are fed into a hydrocyclone, and underflow of the hydrocyclone is fed into a first-stage distribution chute; second-section rough concentrate and first-section rough concentrate produced by second-section distribution are combined and fed into a high-frequency fine screen, oversize products are fed into a ball mill to be ground again, and undersize products are fed into a first-section high-gradient magnetic separator; feeding the non-magnetic product into a second-stage high-gradient magnetic separator, and reselecting the non-magnetic product generated by the second-stage high-gradient magnetic separator to obtain a tin concentrate product; and the first-section magnetic separation product and the second-section magnetic separation product are combined for reselection to obtain a tantalum-niobium concentrate product. According to the method, tantalum, niobium and tin in the extremely-low-grade tantalum-niobium-tin ore can be efficiently and comprehensively recycled.

The invention discloses a method for obtaining cassiterite concentrate by utilizing tin polymetallic ore, and relates to the technical field of ore dressing. Sulfur concentrate products are obtained through hydrocyclone desliming and sulfur flotation firstly, then a grading-flotation-reselection-flocculation-flotation linkage process is adopted for sulfur tailings, different ore selection processes are adopted for coarse particles and fine particles, tin is fully recycled by optimizing the fine particle treatment process, and the recovery rate of the tin is increased. And comprehensive recovery of valuable elements is realized. According to the process provided by the invention, the dosage of chemicals can be reduced under the same flow condition, the cassiterite recovery rate is higher, and the cost is lower.

The invention relates to the technical field of metallurgy, and particularly discloses a process for enriching copper and nickel from secondary nickel return charge, the secondary nickel return charge, cassiterite and a slag former are blended and then calcined in a reducing atmosphere, the main component of the cassiterite is SnO2, the cassiterite is reduced into Sn in the reducing atmosphere, the Sn has a lower melting point, the melting point of the Sn is higher than that of the slag former, and the copper and nickel are enriched in the secondary nickel return charge. The tin-nickel-copper low-melting-point alloy has the advantages that the tin-nickel-copper low-melting-point alloy can permeate into alloy crystal grains of the secondary nickel return material, the original compact structure is destroyed, the dissolving and leaching difficulty of nickel and copper in the secondary nickel return material is effectively reduced, and then the dissolving and leaching efficiency is improved; and meanwhile, the cassiterite is doped, so that the smelting temperature is reduced, and compared with the smelting temperature of about 1400-1500 DEG C in the prior art, the smelting can be performed at 1000-1100 DEG C, so that the energy consumption is saved, and the tin in the cassiterite can be effectively recycled.

The invention provides an alkyl ether hydroxamic acid collecting agent and a preparation method and application thereof, and belongs to the technical field of flotation beneficiation. The alkyl ether hydroxamic acid collecting agent is prepared through a hydroxylamine method, namely, alkyl ether acetic acid and methyl alcohol are subjected to an esterification reaction firstly, then hydroxylamine and alkali are subjected to a hydroximation reaction, and a final product is obtained. On the basis of a traditional hydroximic acid collecting agent, an alkyl ether functional group is introduced to enhance the selectivity, and the alkyl ether functional group and a hydroxime group in a molecular structure have a synergistic effect, so that the collecting performance and the selectivity are further improved. The alkyl ether hydroxamic acid collecting agent prepared through the method can be applied to the field of flotation of various minerals such as rare earth ore, tungsten ore, cassiterite, apatite, malachite and ilmenite. In addition, the collecting agent can reduce the use amount of flotation reagents, and has important significance in mineral flotation operation.

The present invention discloses a flotation method for fine-grained cassiterite oxide ore, which belongs to the field of mineral processing technology. For fine-grained cassiterite oxide ore with extremely fine particle size and high content of mud minerals and iron oxide minerals, which is difficult to select, the method comprises the following steps: 1) re-grinding the fine-grained cassiterite oxide ore to a content of more than 65% of ‑37μm and a flotation pulp concentration of 30‑35%; 2) reducing the sulfur content to less than 1% through a flotation desulfurization process; 3) adding a desludging collector and using flash flotation to remove some of the fine mud. 4) adding a sludge dispersant. 5) adding a mixed collector and an auxiliary collector to float out the tin minerals to obtain a tin concentrate product. The present invention has the advantages of strong adaptability to materials, stable indicators, low dosage of reagents, and high recovery rate, and is an economical and efficient method for flotation recovery of fine-grained cassiterite oxide ore.

The invention belongs to the technical field of mineral separation, and particularly relates to a method for improving the tin recovery rate through mineral ceramic ball regrinding and recleaning in a shaking table. According to the method, ore in a tin ore table is ground, ore pulp is obtained, and an ore grinding medium used for ore grinding comprises ceramic balls; carrying out desulfurization flotation on the ore pulp to obtain sulfur concentrate and flotation tailings; and the flotation tailings are subjected to shaking table gravity separation operation, and tin concentrate is obtained. According to the method, a porcelain ball grinding and floating weight combined method is adopted for tin ore table middling, argillization of tin ore can be relieved from the source, monomer dissociation of the ore is improved, the influence of iron pollution on desulfurization is reduced, the grade and the recovery rate of tin concentrate are improved, efficient recycling of tin resources is guaranteed, and the method is suitable for industrial production. And the method has important significance for improving the tin ore recovery rate. Meanwhile, the method has the advantages of being low in energy consumption, easy to operate, low in sorting cost and the like, the tin recovery rate can be increased by 3-5%, and economic benefits are obvious.

The embodiment of the invention provides a cassiterite high-precision tin isotope determination method which comprises the following steps: selecting a cassiterite sample, grinding, and weighing the ground cassiterite sample; adding the weighed cassiterite sample into a sample dissolving tube, slowly adding high-purity hydrobromic acid into the sample dissolving tube, and heating and sealing the sample dissolving tube to completely dissolve cassiterite; taking out the dissolved sample, and diluting the dissolved sample to a constant volume; sequentially carrying out evaporation acid removal and redissolution on the diluted and constant-volume sample to obtain a sample to be measured; establishing a cup structure for Sn isotope static determination; and performing high-precision Sn isotope measurement on the to-be-measured sample according to the cup structure. According to the method, complete dissolution of cassiterite can be achieved, the extremely high tin recovery rate is ensured, the problem of extra isotope fractionation caused by solution volatilization in the processes of tin recovery incompleteness, dissolution and evaporation drying to medium conversion can be effectively solved, and therefore the accuracy and reliability of Sn isotope analysis are ensured.

The application discloses a beneficiation method of low-grade tin ore by using magnetic separation and flotation. The beneficiation method of low-grade tin ore by using magnetic separation and flotation comprises the following steps: step (1), crushing and grinding the low-grade tin ore, using water as a leaching agent, and separating by a wet magnetic separator to obtain magnetic minerals and magnetic tailings; step (2), drying the magnetic tailings after the magnetic separation, and then placing the tailings in a flotation agent to perform a flotation treatment to obtain flotation minerals and flotation tailings; step (3), concentrating the flotation tailings after the flotation treatment to obtain concentrated tailings; and step (4), smelting the concentrated tailings to finally obtain tin metal, sulfide, silicate, oxide and impurities. The application combines the magnetic separation and the flotation to improve the ore separation efficiency and the recovery rate, the water is used as a leaching liquid in the magnetic separation process to reduce the cost, and no new impurities are introduced, and the flotation agent can reduce the surface tension of the tin ore to improve the leaching rate.

The present invention discloses a tin tailings classification and recovery device, which includes a frame, a turntable, a water spraying mechanism, a watering pipe and a shaking table. Also disclosed is a tin tailings classification and recovery process, which includes the following steps: feeding, particle size sorting, collecting tin ore, and screening tin ore. The tin tailings classification and recovery device has the advantage of convenient screening and recovery of tin tailings. The beneficial effects achieved by the present invention are: the equipment layout is reasonable and compact, and the floor space is small. During the sorting and screening process, no conveying device is required to transport the tin tailings. The operator only needs to operate on one device to complete the sorting, suspension vibration separation and shaking table separation of the tin ore, thereby achieving the advantage of convenient screening and recovery of the tin tailings.

The invention discloses a flotation collecting agent and a preparation method and application thereof, and relates to the technical field of mineral separation. The flotation collecting agent comprises carbonized methyl carbamate, zinc diethyldithiocarbamate, butyl octanol and sulfate according to the mass ratio of (3-6): (1-12): (2-3): (3-8). According to the prepared composite flotation reagent, in the cassiterite ore flotation treatment process, after one-time roughing, three-time scavenging and three-time concentration, the loss of easily-argillized fine-grain and micro-fine-grain cassiterite in tailings is reduced, the cassiterite content in cassiterite ore is reduced through precise adsorption of the reagent, efficient recovery of the fine-grain and micro-fine-grain cassiterite is achieved, and the cassiterite flotation efficiency is improved. The effective recovery of cassiterite is improved, and the tin grade and the recovery rate in the tin concentrate are also remarkably improved.

The invention discloses a micro-fine particle cassiterite flotation combined inhibitor and a preparation method and application thereof, and belongs to the technical field of mineral processing flotation. The combined inhibitor is composed of sodium phosphinate, sodium alginate and DL-2-aminobutyric acid and can be used for the flotation process of micro-fine particle cassiterite, and excellent flotation indexes are obtained. The combined inhibitor can remarkably inhibit siliceous gangue minerals in micro-fine particle cassiterite flotation, efficient selective separation is achieved, through the synergistic effect of all the components, the combined inhibitor can greatly reduce the total agent dosage, and the combined inhibitor is easy to prepare, environmentally friendly and convenient to industrially store and implement. The method is of great significance in achieving efficient flotation separation and enrichment of micro-fine particle cassiterite and improving the comprehensive utilization rate of tin resources.

The invention provides a method for separating tantalum-niobium smelting slag. The method comprises the following steps of water leaching pretreatment, screening classification, cassiterite reselection and enrichment and high-strength magnetic separation of rare earth. Wherein in the water leaching pretreatment, tantalum-niobium smelting slag and water are mixed according to the liquid-solid ratio of (1-7): 1, stirring is performed at the temperature of 0-30 DEG C, and water leaching slag and filtrate are obtained through separation; and the particle size of the screening and grading is 38-74 microns. Soluble impurities are fully dissolved and separated through low-temperature water leaching, and interference of the soluble impurities on the follow-up sorting effect is avoided; the materials are split according to particle size differences in the screening and grading process, so that the coarse and fine particle materials are matched with optimal gravity separation equipment respectively, and density separation of cassiterite and rare earth ore can be achieved more easily; cassiterite extraction is achieved by means of density difference during reselection and enrichment of cassiterite, rare earth ore is accurately separated through high-strength magnetic separation by means of magnetic difference, and separation of all processes is more sufficient. In addition, the separation method is a physical beneficiation method and is low in cost, simple, environmentally friendly and friendly to the environment.

The present invention discloses a flotation collector, a preparation method, and an application thereof, and relates to the field of mineral processing technology. The flotation collector comprises carbonized methyl carbamate, zinc diethyldithiocarbamate, butyl octanol, and sulfate in a mass ratio of (3-6): (1-12): (2-3): (3-8). During the flotation treatment of cassiterite ore, the composite flotation agent prepared thereby reduces the loss of easily muddied fine and micro-grained cassiterite in tailings after one roughing, three scavenging, and three cleaning steps. The agent accurately adsorbs and reduces the cassiterite content in the cassiterite ore, achieves efficient recovery of fine and micro-grained cassiterite, improves the effective recovery of cassiterite, and significantly improves the tin grade and recovery rate in the tin concentrate.

This invention discloses a method for the flotation recovery of fine-grained cassiterite embedded in coarse sand of tin-containing polymetallic tailings, relating to the field of mineral processing technology. It introduces microwave pretreatment technology into the recovery of fine-grained cassiterite embedded in coarse sand at the tailings dam head, employing a combined process of "microwave pretreatment-grinding-intense magnetic separation for iron removal-fine-grained cassiterite flotation" to improve cassiterite recovery efficiency. This method utilizes the differences in microwave absorption capacity between cassiterite, iron-bearing minerals, and gangue to generate selective thermal stress and microcracks at the mineral interface, achieving efficient and selective dissociation of cassiterite from the intergrowth of iron-bearing minerals and gangue. Intensive magnetic separation then removes iron-bearing minerals, eliminating their interference with flotation. Finally, a ternary combined collector composed of SN01-1-hydroxyoxime acid, SN02-1-hydroxyoxime acid, and a flotation defoaming agent is used for cassiterite flotation. This method achieves efficient recovery of difficult-to-process cassiterite resources from coarse sand in tailings dams, providing an effective technical path for the resource utilization of historically inherited tailings.