79 results about "Scheelite" patented technology

According to the raw ore classification method, device and equipment provided by the invention, the recognition performance of a YOLOv8 model is optimized by training and verifying a raw ore image data set, especially a scheelite calcareous degree image data set, and setting an overlapping degree IoU loss function for measuring the matching degree of the position and the scale between a prediction frame and a target frame, so that the recognition efficiency is improved. The precision and the speed of raw ore automatic identification are improved, and the double requirements of an ore separation system for real-time performance and accuracy are met.

The invention discloses a normal-temperature efficient recovery method for low-grade tungsten in gold, antimony and tungsten multi-metal symbiotic ore. The method comprises the steps that raw ore is ground and then subjected to shaking table reselection, reselected concentrate, reselected middling and reselected tailings are obtained, foam flotation is conducted on the reselected middling, sulfide ore is floated out, coarse-grain tungsten minerals are recycled through reselection of the flotation tailings, ore grinding is conducted on the reselected tailings, gold and antimony bulk flotation is conducted, then scheelite flotation and tungsten concentrate flotation are conducted under the action of a combined collecting agent, and finally tungsten concentrate is obtained. According to the method, aiming at the characteristic that the granularity of the tungsten mineral in the gold-antimony-tungsten symbiotic ore is uneven in thickness distribution, a proper ore grinding separation process and proper ore grinding fineness are selected, the tungsten mineral is prevented from being over-crushed, and underground wastewater is reasonably utilized, so that the use amount of clear water is effectively reduced, and meanwhile, the underground wastewater is recycled; furthermore, an ore pulp heating process is omitted in the tungsten ore concentration stage, the fuel cost is greatly reduced, and therefore the production cost is greatly reduced on the premise that the tungsten concentrate recovery rate is guaranteed.

The invention discloses a system and method for improving the leaching rate of low-grade scheelite, and relates to the technical field of mineral recycling. S2, pulping; s2, pulping; s4, crushing and activating by a vertical mill; s5, pressure cooking and leaching; s6, carrying out primary solid-liquid separation; s7, enrichment is carried out; and S8, carrying out secondary solid-liquid separation. According to the technical scheme of cooperation of the rotational flow and the vertical mill in the system, heavy and light phases are separated, the efficiency of the vertical mill is improved, the activation energy of ore pulp obtained after ore grinding is increased, the leaching reaction is facilitated, the yield of the whole process is improved, valuable metal enrichment of low-grade raw ore can be achieved, consumption of raw and auxiliary materials is low, multiple times of solid-liquid separation and enrichment are achieved, and the comprehensive utilization rate of the raw ore is improved. Enriched mineral powder and return water are returned to the front section for recycling, so that energy conservation and emission reduction are realized.

This invention relates to the field of scheelite processing technology, and particularly to a method for processing scheelite ore, comprising the following steps: first, slurry conditioning; pH adjustment, the method for controlling the pH value of the reaction solution includes: after controlling the reaction solution to a first pH value, lowering the pH value to a second pH value every first time period, and finally controlling the residual acid concentration of the reaction solution to be controlled at 8-11 g / L and maintained for a second time period; first filtration; second slurry conditioning; leaching; second filtration. Using the scheelite ore processing method provided by this invention, after treating the scheelite ore with a first reagent under certain conditions, followed by leaching treatment, effectively reduces the tungsten content in the slag and reduces tungsten loss. This method has the advantages of a short process, less reagent addition, less slag and solution formation, and significantly reduced tungsten loss.

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 utility model relates to the technical field of filling mining, and discloses a gently inclined medium-thickness ore body filling mining device which comprises a vehicle body, limiting sliding grooves are formed in the front inner wall and the rear inner wall of the vehicle body, a feeding hopper is fixedly installed at the left end of the bottom of the vehicle body, and a first conveying mechanism is arranged on the right side of the feeding hopper. A discharging hopper is fixedly installed at the right end of the bottom of the vehicle body, a second conveying mechanism is arranged on the left side of the discharging hopper, two crushing rollers are arranged between the first conveying mechanism and the second conveying mechanism, a second rotating shaft is fixedly inserted in each crushing roller, and a transverse plate is arranged at the bottom of each crushing roller; and it is ensured that discharged scheelite is fully crushed, later fine treatment is facilitated, and the practicability of the device is effectively improved.

The invention relates to scheelite matrix non-rare earth activated dark red fluorescent powder. The composition of the material is M3A2 (W, Mo) (1-x-y) O9: xMn < 4 + >, yBi < 3 + >, in the formula, M is any one of alkaline earth metals Ca, Sr and Ba; a is any one of Y, Gd and La; 0 lt; 0 < = y < = 1%. The dark red fluorescent powder provided by the invention is stable in matrix structure and performance, relatively good in physical and chemical stability, stable in luminescence performance, firm and uniform in particle, and relatively high in crystallinity and purity. A tungsten molybdate solid solution is used as a matrix, Mn < 4 + > is used as a luminescence center, Bi < 3 + > is used as a sensitizer, the raw materials are easy to obtain and non-toxic, and the prepared product can effectively absorb near ultraviolet light in the range of 300-400 nm and emit dark red light in the range of 650-700 nm, and has a certain beneficial effect of supplementing red light in the field of current white light LEDs and plant illumination LEDs.

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 provides a beneficiation method for recovering scheelite from low-grade tailings, and belongs to the technical field of ore separation processes. According to the method, the tungsten-containing tailings which are low in grade, low in value and difficult to recover are converted into valuable and easy-to-recover ore resources at low cost through the magnetic separation / centrifugal machine reselection combined physical mineral separation technology, and the reagent cost of subsequent flotation is greatly reduced. Then carrying out a flotation test, and discarding tailings of flotation middlings by adopting a centrifugal machine so as to remove gangue which is easy to float and argillization and avoid continuous circulation and accumulation of the gangue in a closed circuit to influence the floating of target minerals and the quality of concentrate; meanwhile, a nontoxic and environment-friendly gangue inhibitor CD-6 is adopted and matched with a CK-3 composite collecting agent, efficient separation of gangue minerals and tungsten minerals is achieved, finally, comprehensive recycling of extremely-low-grade tungsten-containing tailing resources is achieved, and a new effective method is provided for development and utilization of similar tungsten-containing tailing resources.

The utility model discloses preparation equipment for fluorite and scheelite associated ore. The preparation equipment comprises a first crushing barrel, a separation barrel, a second crushing barrel, a third crushing barrel, a flotation barrel and an acid leaching barrel which are arranged from top to bottom, the first crushing barrel is used for crushing ores to a first preset particle size; the sorting barrel comprises a sorting device, a first sorting discharge port, a second sorting discharge port and a third sorting discharge port, and the sorting device sorts scheelite coarse ore and fluorite coarse ore from the coarse ore through X rays; the scheelite coarse ore and the fluorite coarse ore sequentially fall into the first separation discharging opening and the second separation discharging opening; the second crushing barrel is used for crushing the scheelite coarse ore to a second preset particle size; the third crushing barrel is used for crushing the fluorite coarse ore to a third preset particle size; the flotation barrel is connected with the second crushing barrel and used for flotation of scheelite concentrate and scheelite tailings; the acid leaching barrel is connected with the flotation barrel and the third crushing barrel and used for conducting acid leaching on the scheelite tailings and the fluorite coarse ore to form fluorite concentrate. The fluorite and scheelite associated ore separator can realize separation of fluorite and scheelite associated ore.

The invention belongs to the field of mineral processing and secondary resource recycling, and particularly relates to a method and a system for recovering tungsten from scheelite heating concentrate tailings, the method comprises the following steps: blowing carbon dioxide-containing gas into slurry containing the scheelite heating concentrate tailings, and carrying out gas-solid-liquid three-phase activation treatment to obtain activated ore pulp; and then the activated ore pulp is directly subjected to roughing without an additional collecting agent, and scheelite roughing concentrate is obtained. According to the method, carbon dioxide is creatively adopted for carrying out gas-solid-liquid three-phase modification activation on the tailings, in this way, the surface property of the tailings can be optimized, scheelite surface calcium sites are selectively activated, and the recovery rate and the collecting selectivity of tungsten in the tailings can be effectively improved through further cooperation with subsequent direct flotation treatment without additional agents.

The invention discloses a method for preparing Sr < 0.6 > Ba < 0.4-x > MoO4: xPr < 3 + >, yPEG-200 system scheelite type red fluorescent powder by a combustion method, Sr (NO3) 2, Ba (NO3) 2 and (NH4) 6Mo7O14. 4H2O are used as reaction raw materials, Pr < 3 + > is used as rare earth ion doping, citric acid is used as a combustion improver, and the Sr < 0.6 > Ba < 0.4-x > MoO4: xPr < 3 + > fluorescent powder is synthesized by combustion. A combustion method is adopted for synthesis, the advantages of being low in reaction temperature, short in time and small in synthesized sample particle are achieved, and the Sr0. 6Ba < 0.4-x > MoO4: xPr < 3 + >, yPEG-200 red fluorescent powder synthesized through the experiment is high in luminescence performance and can be used as red fluorescent powder for a white light LED. According to the invention, the surfactant PEG-200 is added to improve the morphology of the sample and enhance the luminescence property of the sample, and the trivalent praseodymium ions are doped in the molybdate with the scheelite structure, so that the luminescent material has high emission intensity in a dark red region.

This invention belongs to the field of mineral processing technology, specifically disclosing a method for recovering scheelite and fluorite from scheelite rough concentrate by ambient temperature flotation. It replaces the traditional reagents used in laboratory-scale tests with a reagent combination of sodium carbonate, brine glass, and a lead nitrate-hydroxyvalerate complex. Combined with grinding, concentration, and de-removal pretreatment, this method achieves efficient recovery of scheelite and fluorite from scheelite rough concentrate under ambient temperature conditions. The recovered scheelite concentrate has a WO3 grade of over 32.95%, with an operational recovery rate of over 61.55%; the fluorite concentrate has a CaF2 grade of over 93.22%, with an operational recovery rate of over 51.25%. This method achieves comprehensive recovery and utilization of associated resources, eliminating the need for heating or acid leaching treatment and significantly reducing energy consumption.

The present application belongs to the field of calcium-containing mineral flotation, and particularly relates to a combined collector, which comprises a collector A and a collector B, wherein the collector A is at least one compound with the structural formula of formula 1; the collector B is a collector capable of collecting scheelite; in R1-R4, at least two substituents are substituents of formula a, and the remaining substituents are H, C1-C3 alkyl or formula a. The present application also includes the use of the combined collector for the collection and flotation of scheelite. The combined collector can synergistically improve the flotation of scheelite and help to improve the selective flotation separation of scheelite and calcium-containing gangue.

The application discloses a combined depressor for recovering scheelite from ultra-low-grade tungsten-molybdenum associated ore and a method, the combined depressor comprising sodium humate, sodium mercaptoacetate, ammonium citrate, sodium pyrophosphate, sodium fluosilicate and lead nitrate, and the six kinds of substances are configured into the combined depressor in a proportion of 1:1:(2-5):(1-5):(1-3):(2-5). The application aims at recovering scheelite from low-grade refractory ore, improves the separation effect of scheelite and gangue minerals, improves the scheelite recovery rate and the concentrate grade, and improves the economic benefit.

The system comprises a crushing box, a magnetic separation tank I, a magnetic separation tank II, a mixing tank I, a flotation machine I, a mixing tank II, a flotation machine II and a centrifugal unit, and scheelite concentrate and fluorite concentrate are obtained. According to the method, magnetic separation and flotation are conducted in sequence, corrosion of ore pulp acidity to magnetic separation equipment is reduced, meanwhile, the ore pulp is acid through oxalic acid pickling, and oxalic acid serves as organic acid, has high chelation capacity and reducibility and can effectively react with oxides and pollutants on the surfaces of minerals, and the oxides and the pollutants are removed from the surfaces of the minerals. Meanwhile, oxalic acid can also react with sulfide minerals to change the surface properties of the sulfide minerals, so that the sulfide minerals are more easily captured and recycled in the flotation process. Under an acidic condition, oxalic acid can more effectively react with metal ions on the surface of fluorite to form a stable complex. The hydrophobicity of fluorite particles is enhanced, the fluorite particles are captured by a flotation agent and float to the surface of ore pulp, fluorite flotation is enhanced, and interference to scheelite flotation is reduced.

The invention belongs to the field of scheelite flotation, and particularly discloses a collecting agent, a composite flotation reagent and a method for flotation separation of scheelite and calcium-containing gangue, and the flotation separation comprises the steps that the flotation reagent containing the collecting agent is adopted for flotation of mixed minerals containing the scheelite and the calcium-containing gangue, and the flotation reagent containing the collecting agent is adopted for flotation of the mixed minerals containing the scheelite and the calcium-containing gangue; scheelite concentrate and calcium-containing gangue tailings are obtained; the collecting agent comprises at least one of a collecting agent a # imgabs0 # and a collecting agent b # imgabs1 #; the R1 and the R2 are independently alkyl groups of C4-C12; m is H, Na, K or NH4. The collecting agent disclosed by the invention has obvious collecting selectivity on scheelite which is a calcium-containing mineral, and meanwhile, the collecting agent has excellent collecting capacity.

The utility model discloses a scheelite scavenging flotation machine, which relates to the technical field of tungsten ore mining, and comprises a box body, a plurality of support columns fixedly connected to the bottom of the box body, a discharge pipe fixedly connected to the front side of the box body, a rotating mechanism mounted at the bottom of the box body, a feeding mechanism arranged in the box body, and an inflating mechanism and a throwing mechanism mounted at the top of the box body, a protection mechanism is arranged at the top of the inflation mechanism, the rotating mechanism comprises a first rotating shaft, and the first rotating shaft is rotationally connected into a bottom plate of the box body. The device has the beneficial effects that a motor works to drive a first rotating shaft to rotate so as to drive second impellers to rotate, and meanwhile, the first rotating shaft rotates to drive a first gear to rotate so as to drive two second gears to rotate, so that two second rotating shafts are driven to rotate, and two first impellers are driven to rotate; and through rotation of the first impeller and the second impeller, solid particles and chemicals in the ore pulp can be fully mixed, and meanwhile uniform distribution of bubbles is promoted.

The invention provides a comprehensive treatment method of scheelite, and relates to the technical field of mineral treatment. Specifically, the method comprises the following steps: preparing a dispersion liquid containing scheelite, hydrochloric acid and an adsorbent (including at least one of an extraction agent or adsorption resin); performing ultrasonic treatment or microwave treatment on the dispersion liquid at 60-80 DEG C to obtain a mixed phase; standing the mixed phase, and separating to obtain an inorganic precipitate and an organic phase; sequentially carrying out ammonia dissolution treatment, anion resin purification treatment and evaporative crystallization treatment on the inorganic precipitate to obtain ammonium paratungstate; the organic phase is sequentially subjected to one of reverse extraction treatment or analysis treatment, and then a calcium product is obtained through separation. According to the method, the tungsten extraction efficiency is effectively improved, the negative influence of a tungsten wrapping layer in scheelite on acid leaching is reduced, and effective recovery and reutilization of calcium resources are achieved; the scheelite treatment cost is reduced, the resource utilization rate is increased, and the environmental pollution is reduced.

The invention belongs to the field of scheelite flotation, and particularly discloses a collecting agent, a flotation reagent and a method for scheelite flotation, and the method for scheelite flotation comprises the step that flotation is conducted on to-be-selected minerals containing scheelite and the flotation reagent containing the collecting agent, and scheelite concentrate is obtained. The collecting agent comprises at least one compound in a formula A # imgabs 0 # and a formula B # imgabs 1 #; r1 and R2 are independently alkyl groups of C2-C8; m is H, Na, K or NH4. The collecting agent disclosed by the invention has obvious collecting selectivity on scheelite which is a calcium-containing mineral, and meanwhile, the collecting agent has excellent collecting capacity.

The invention discloses a CaCeNbWO8-based high-entropy negative temperature coefficient thermal sensitive ceramic material and a preparation method thereof, belongs to the field of negative temperature coefficient thermistors, and aims to expand the temperature zone range of a scheelite structure negative temperature coefficient thermal sensitive ceramic material. The material is prepared by mixing and firing raw materials including calcium carbonate, cerium dioxide, tungsten oxide, niobium pentoxide, samarium oxide, europium oxide, lanthanum trioxide, holmium oxide or dysprosium oxide according to a stoichiometric ratio, the chemical formula is (Ca1 / 3Ce1 / 3M1 / 3) (Nb1 / 2W1 / 2) O4, and M is Sm, Eu, La, Ho or Dy; the electrical property parameters of the thermal sensitive ceramic material with the negative temperature coefficient are as follows: B200 DEG C / 1100 DEG C is equal to 6081-7210 + / -1.8% K, rho1100 DEG C is equal to 2.87 * 10 < 3 >-4.09 * 10 < 3 > + / -1.37% omega.cm, and the applicable temperature range is 200-1100 DEG C. The material has a wide temperature range of 200-1100 DEG C, can maintain high sensitivity at a high temperature due to a large material constant B value, and shows excellent aging stability at 1000 DEG C. Through measurement, the resistance drift rate of the thermal sensitive ceramic material with the negative temperature coefficient is less than 3.49 + / -0.03% after the thermal sensitive ceramic material is aged at 1000 DEG C for 500 hours.

The invention belongs to the technical field of multi-metal ore dressing, and particularly relates to a tungsten-containing multi-metal ore comprehensive ore dressing system. The system is provided with a crusher, an ore grinding machine, a magnetic separation unit, a stirrer I, a sulphide ore full-floating unit, a stirrer II, a scheelite-fluorite co-floating unit, a centrifugal unit I, a fluorite concentrate tank and a scheelite concentrate tank, and mineral crushing, ore grinding, magnet removal, weakly magnetic ore removal, sulphide ore full-floating, scheelite fluorite co-floating and scheelite fluorite gravity separation are carried out in sequence. And concentrate such as magnetite, wolframite, sulphide ore, fluorite and scheelite is obtained, the concentrate grade is high, and comprehensive recovery of resources is achieved.

The invention discloses a beneficiation process for beneficiation and recovery of scheelite and fluorite from argillized tungsten polymetallic ore. The beneficiation process sequentially comprises the steps of magnetite removal, low-intensity magnetic separation mineral removal, sulphide ore removal through acidification, scheelite-fluorite mixed concentration and centrifugal separation to obtain scheelite concentrate and fluorite concentrate. By adopting magnetic separation and flotation operation, corrosion to equipment can be reduced, meanwhile, the grade and the recovery rate of the scheelite concentrate and the fluorite can be improved, and under the condition that the strong magnetic tailings contain 0.34% of tungsten and 25.65% of fluorite, the scheelite concentrate with the tungsten content of 17.96% and the accumulative recovery rate of 20.42% can be obtained through tests; the content of fluorite in the fluorite concentrate is 77.86%, and the accumulative recovery rate is 47.72%.

The invention discloses a beneficiation method for efficiently and comprehensively recovering tungsten-molybdenum-bismuth polymetallic ore, and relates to the technical field of nonferrous metal beneficiation. Raw ore is subjected to ore grinding, grading and stirring to obtain feeding ore pulp, then bulk flotation roughing is conducted, and rough concentrate and roughing tailings are obtained; the roughing tailings are subjected to mixed flotation scavenging, and scavenged concentrate and scavenged tailings are obtained; the scavenging tailings are subjected to low-intensity magnetic separation, and iron ore concentrate and low-intensity magnetic tailings are obtained; performing strong magnetic roughing operation on the weak magnetic tailings to obtain wolframite rough concentrate and strong magnetic tailings; the wolframite rough concentrate is subjected to gravity separation to obtain wolframite concentrate and gravity separation tailings; the strong magnetic tailings are subjected to scheelite flotation, and scheelite concentrate and scheelite flotation tailings are obtained; fluorite flotation is conducted on scheelite flotation tailings, fluorite concentration first foam and fluorite scavenging tailings are obtained, the fluorite concentration first foam is subjected to repeated concentration for 2-8 times, fluorite concentrate products are obtained, and efficient multi-metal separation is achieved through the processes of molybdenum-bismuth-sulfur bulk flotation, iron low-intensity magnetic separation, wolframite high-intensity magnetic separation, wolframite gravity separation, scheelite flotation and fluorite flotation.

The present invention discloses a device for recovering scheelite by strong magnetic-gravity separation of polymetallic ores. The device comprises a weak magnetic separator (100), a strong magnetic separator (200), a first buffer tank (300), a second buffer tank (500) and a centrifugal concentrator (600). Magnetite concentrate, scheelite coarse ore and tailings (discarded tails) can be separated through a single magnetic separation, thereby reducing the processing volume of strong magnetic separation and saving production costs. The scheelite coarse ore obtained by rough separation is concentrated and subjected to multiple centrifugal operations to obtain scheelite concentrate. The grade and recovery rate of the recovered scheelite in this manner are both improved.

The present invention discloses a beneficiation process for recovering scheelite and fluorite from muddy tungsten polymetallic ore. The process sequentially removes magnetite, removes weak magnetic ore, acidifies and removes sulfide ore, selects a mixed scheelite-fluorite mixture, and then centrifuges to obtain scheelite concentrate and fluorite concentrate. The process employs magnetic separation followed by flotation to reduce equipment corrosion while also improving the grade and recovery rate of the scheelite concentrate and fluorite. Under the conditions of a strong magnetic tailings containing 0.34% tungsten and 25.65% fluorite, experiments have shown that a scheelite concentrate with a tungsten content of 17.96% and a cumulative recovery rate of 20.42% can be obtained; a fluorite concentrate with a fluorite content of 77.86% and a cumulative recovery rate of 47.72% can be obtained.

This invention discloses a method for treating scheelite beneficiation wastewater based on gradient desiliconization and micro / nano bubble oxidation. The method includes the following steps: adding lime to the scheelite beneficiation wastewater for coagulation and sedimentation; collecting the primary supernatant after sedimentation separation; adding a calcium source for deep desiliconization; introducing micro / nano bubbles for oxidation treatment; removing scum from the upper layer of the water system; and adjusting the pH of the effluent to complete the deep treatment of the scheelite beneficiation wastewater. This method, through the synergistic effect of "gradient desiliconization" and "micro / nano bubble oxidation," can achieve simultaneous deep removal of silicon and organic pollutants from scheelite beneficiation wastewater. The treated effluent is of stable quality and can be directly reused in the tungsten flotation process, realizing closed-loop wastewater recycling and resource utilization. It is highly efficient, economical, has high practical value, and promising application prospects.

This invention relates to the field of mineral processing technology, specifically disclosing a beneficiation method for high-calcium and high-iron scheelite. The beneficiation method for high-calcium and high-iron scheelite provided by this invention removes calcium and iron in stages, achieving efficient extraction of scheelite and demonstrating strong applicability. This invention overcomes the interference of calcium- and iron-containing gangue minerals on scheelite flotation, reduces the addition of large amounts of water glass reagents during flotation, improves tailings settling performance, reduces tailings wastewater treatment and reuse costs, and achieves clean production of scheelite concentrate.

A kind of triclinic BiVO4, tetragonal scheelite BiVO4 and [Bi6O5(OH)3] (NO3) 5·3H2O nanosheet material and its preparation method, comprising: bismuth nitrate pentahydrate and cetyltrimethylammonium bromide are dissolved in distilled water, after stirring, solution A is obtained by reaction in microwave reactor at 100 DEG C;Ammonium metavanadate is dissolved in distilled water, stirring until completely dissolved to obtain solution B;Solution A is added dropwise to the flask containing solution B and stirred to obtain solution C;Solution C is obtained by reaction at 100 DEG C using microwave irradiation method, after suspension is obtained by centrifugation, washing, drying to obtain triclinic BiVO4, tetragonal scheelite BiVO4 and [Bi6O5(OH)3] (NO3) 5·3H2O three-phase coexistence material.

A flotation enrichment process is adopted, modified sodium silicate is added into the gold flotation tailings, the floatability of target minerals is improved, selective inhibition on gangue minerals is enhanced, hydroximic acid and sodium oleate are used in a matched mode to serve as a composite collecting agent, and the recovery rate of scheelite is improved. The collecting capacity and selectivity of the collecting agent are improved, pre-enrichment of scheelite is achieved, and a tungsten rough concentrate product is obtained. And the rough concentrate, sodium carbonate and sodium hydroxide are evenly mixed according to a certain proportion and then roasted, CaWO4 is converted into Na2WO4 and Ca3WO6, and high-efficiency leaching of tungsten can be achieved by using water as a solvent for cinder at normal temperature and normal pressure.