455 results about "Lead zinc" patented technology

The invention provides a process for recovering various valuable elements such as lead, zinc, silver and potassium from soot of a steel mill. The process comprises the following steps of water leaching, fluorine removal, high-temperature concentration, primary cooling crystallization, secondary cooling crystallization, secondary leaching, ammonia leaching and ammonia distillation. According to the recovery process, potassium in the soot of the steel mill is recovered in the form of potassium chloride, zinc is recovered in the form of zinc sulfate, silver is recovered in the form of silver chloride, only auxiliary materials such as sulfuric acid, ammonia water and calcium chloride which are low in price are used in the whole recovery process, the cost is low, no waste water or waste residues are generated in the whole process, the direct recovery rate of lead and zinc is 95% or above, and the production cost is low. The direct recovery rate of silver is 98% or above, and the method has practical application value.

The invention relates to the technical field of artificial intelligence, and discloses an intelligent dosing method and system for lead zinc ore flotation to improve the efficiency, stability and economic benefits of a flotation process. The method comprises the following steps: calculating a first cross-modal feature and a second cross-modal feature, fusing the first cross-modal feature and the second cross-modal feature with a bubble image feature and an element grade feature through residual connection, and then processing to obtain a multi-modal feature sequence; inputting the multi-modal feature sequence of each time step into an LSTM network to obtain a corresponding LSTM hidden state sequence; calculating the time attention weight of the hidden state sequence of each time step in the time window, and performing weighted summation on the corresponding LSTM hidden state sequence according to the time attention weight to obtain a context vector in the time window; and finally, sharing the weighted and summed context vector serving as an input to a full connection layer corresponding to the two detection heads so as to respectively obtain probability distribution of predicted medicament types and a dose value of each medicament.

The invention belongs to the technical field of slag metallurgy, and relates to a coprocessing method for copper smelting slag and zinc leaching slag, which comprises the following steps: S1, mixing the copper smelting slag, the zinc leaching slag, a vulcanizing agent and a flux to obtain a mixture; introducing a mixture of pulverized coal and air, and reacting at 1150-1300 DEG C for 2-4 hours to obtain a gas phase, a slag phase and matte; s2, the gas phase is subjected to dust removal, and zinc oxide smoke dust rich in zinc, lead and silver is obtained; zinc is leached from the zinc oxide smoke dust through a wet method; and S3, the slag phase is subjected to slow cooling, ore grinding and copper flotation, copper concentrate is obtained, and gold, silver and copper elements are recycled. According to the method, heat of the high-zinc hot-state copper smelting slag is used for processing the high-copper normal-temperature zinc hydrometallurgy slag, and the slag processing energy consumption of the zinc hydrometallurgy slag is reduced. Through mixing treatment, lead and zinc in the mixed slag enter the secondary zinc oxide smoke dust to be recovered, and the recovery rate of the lead and the recovery rate of the zinc both reach 80% or above; and the total recovery rate of copper in the mixed slag is greater than 85% after copper enters matte recovery.

The invention discloses a quality-divided treatment and recycling method for lead-zinc beneficiation wastewater, and belongs to the technical field of beneficiation wastewater treatment.The method comprises the steps that beneficiation tail water is introduced into a Fenton reaction tank, a catalyst is added firstly, then hydrogen peroxide is added, a Fenton oxidation reaction is conducted, after the Fenton oxidation reaction is finished, the beneficiation tail water is introduced into a coagulation reaction tank, caustic soda liquid is added, and the mixture is stirred and mixed uniformly; adding a precipitating agent, a flocculating agent and a stabilizing agent, and flocculating and settling the precipitate; introducing the beneficiation tail water added with the treatment agent into a honeycomb inclined tube sedimentation tank, further flocculating and settling, then returning flocculated precipitates in a bottom tank to a coagulation reaction tank, and discharging redundant bottom mud into a tailing pond; and settled clear water enters a clear water tank and is used as production water for ore grinding classification and flotation operation. According to the invention, through quality-divided treatment-quality-divided recycling of the beneficiation wastewater, it is ensured that the beneficiation tail water meets the requirements of ore grinding and flotation production indexes, the treatment cost of concentrate overflow water and filtered water is reduced, and the purpose of 100% recycling of the beneficiation wastewater after quality-divided treatment is achieved.

The invention belongs to the technical field of resource recycling, and discloses lead-zinc tailing ceramsite and a preparation method thereof. The lead-zinc tailing ceramsite is mainly prepared from the following raw materials in parts by mass: 100 parts of lead-zinc tailings; 20 to 30 parts of limestone tailings; 6-8 parts of active mullite nano powder; 1-3 parts of glass micro powder; and 8-12 parts of dry sludge powder. The invention also provides a preparation method of the lead-zinc tailing ceramsite. The lead-zinc tailings are used as main raw materials to prepare the lead-zinc tailings ceramsite, through compounding of the lead-zinc tailings and the limestone tailings, the synergistic effect of the lead-zinc tailings and the limestone tailings is achieved, resource utilization of the lead-zinc tailings and the limestone tailings is achieved, and good economic benefits and social benefits are achieved. The density grade of the ceramsite prepared by the invention is 600-900, the cylinder compressive strength is 6.8-9.8 MPa, the water absorption rate is 9.4-11.4%, and the ceramsite has relatively good strength and relatively low water absorption rate.

The invention relates to the technical field of flue gas treatment equipment, in particular to a flue gas desulfurization and denitrification treatment device and method for lead-zinc smelting, a desulfurization mechanism is arranged, flue gas and a desulfurizer solution can be fully mixed, compared with a traditional spray mixing mode, the reaction efficiency is higher, blockage is not prone to occurring in the desulfurization process, and the desulfurization effect is better. The dedusting mechanism and the cleaning mechanism are arranged, the dedusting mechanism is beneficial for dedusting flue gas and removing dust and impurities carried in flue gas, meanwhile, the cleaning mechanism can be used for cleaning the spraying layer and removing accumulated reactants or products, and the anti-blocking mechanism is arranged, so that the desulfurization process is kept smooth; and the whole flue gas desulfurization and denitrification process can be smoothly carried out.

The invention relates to the technical field of cement-based material preparation, and particularly discloses a preparation method of an anti-carbonization all-solid waste slag-sulphoaluminate cementing material, which comprises the following steps: (1) putting a wet material formed by lead-zinc tailing powder and water into a reaction container, sealing, and heating; and mixing the obtained product with iron powder and / or iron oxide powder and water, stirring, separating out a solid product, and heating and drying in an air atmosphere to obtain the anti-carbonization tailing powder. And (2) mixing the anti-carbonization tailing powder with sulphoaluminate cement powder, and carrying out mechanical grinding treatment to obtain the modified sulphoaluminate cement. And (3) uniformly mixing blast furnace slag powder, the modified sulphoaluminate cement, fly ash, waste gypsum powder, an alkali activator, gypsum and a water reducing agent serving as raw materials to obtain the cementing material. According to the invention, the resource utilization of industrial solid waste is realized, the carbonization resistance of the cementing material is effectively improved, and the service durability of the cementing material is improved.

According to the low-temperature separation and enrichment system and method for the elements in the multi-element complex metallurgical material, the multi-element complex metallurgical material is pretreated to form powder with a certain particle size, the powder is mixed with pulverized coal and subjected to a reduction reaction with hydrogen in a reaction chamber, meanwhile, different valuable metal elements are separated and enriched through the difference between melting points and boiling points, and the elements in the multi-element complex metallurgical material are separated and enriched. The method not only realizes efficient separation and recovery of elements such as iron, lead, zinc, potassium and sodium in the multi-element complex metallurgical material, but also solves the problems of high energy consumption, low reduction rate and the like in the reduction process of the multi-element complex metallurgical material, and has the advantages of short flow, less equipment, safety in operation, economy, high efficiency and easiness in industrial large-scale production.

The mining area tailing grading filling system is composed of a tailing collecting device, a grading module, a filling slurry preparing module, a conveying module and a filling module and is designed according to the characteristics that tailings of lead-zinc-silver ore and copper-tin-silver-zinc ore contain heavy metal and are complex in particle size. A heavy metal adsorption layer is arranged at the bottom of a collection pool of the tailings collection device, and a sulfide adsorbent is adopted, so that heavy metal ions such as lead, zinc and copper in the tailings can be effectively adsorbed; a cyclone of the grading module is made of a corrosion-resistant material, erosion of chemical substances in the tailings is prevented, the tailings are accurately graded, and grading of filling materials is optimized; the tailings with different particle sizes are accurately separated according to the characteristics of the tailings of the lead-zinc-silver ore and the copper-tin-silver-zinc ore by using the cyclone and multi-layer vibrating screen combined grading equipment; equipment parameters are adjusted to accurately control the granularity of the tailings, so that reasonable grading raw materials are provided for preparation of filling slurry, and the compactness and the stability of a filling body are improved.

The invention provides a poly-like flocculation flotation method for micro-fine particle galena and micro-fine particle sphalerite. The method comprises the following steps: firstly, mixing to-be-treated ore samples containing micro-fine particle galena and micro-fine particle sphalerite with the particle sizes of less than or equal to 20 microns with water to obtain to-be-treated ore pulp, then sequentially adding zinc sulfate, diethyldithiocarbamate, polyoxyethylene, polyaluminum chloride and a foaming agent, and carrying out air inflation flotation and foam scraping to obtain galena concentrate and tailings. ZnSO4 is adsorbed on the surface of the micro-fine-particle sphalerite in advance and generates a synergistic effect with polyaluminum chloride added subsequently, and N, N '-diethyldithiocarbamate is adsorbed on the surface of the micro-fine-particle galena in advance and generates a synergistic effect with polyoxyethylene added subsequently, so that galena hydrophobic floccules and sphalerite hydrophilic floccules with proper apparent particle sizes are formed; on one hand, the flotation recovery rate of the micro-fine particle galena can be increased, and on the other hand, mechanical entrainment of the micro-fine particle sphalerite can be reduced, so that the flotation separation efficiency of the micro-fine particle lead zinc ore can be effectively improved.

The invention discloses a lead-zinc ore preferential flotation method, which relates to the field of mineral processing, and comprises the following steps: S1, pretreating lead-zinc ore to remove impurities in the lead-zinc ore to obtain ore pulp; s2, a lead preferential flotation reagent is added into the ore pulp, lead concentrate and zinc concentrate are obtained, and the adding amount and adding time of the flotation reagent are adjusted through an intelligent control system; s3, according to the ore property and the flotation effect, operating parameters of a flotation machine are intelligently adjusted; and S4, a dynamic simulation model of the flotation process is established, and the flotation process is optimized in real time through a model prediction control algorithm in combination with real-time monitoring data. Through intelligent control and dynamic simulation model optimization, the flotation efficiency and selectivity of the lead-zinc ore are improved, the problems of low flotation efficiency and poor selectivity in the prior art are solved, and the recovery rate and economic benefits of the lead-zinc ore are improved.

The invention provides a method for continuously measuring gold, silver, copper, lead and zinc in gold-based alloy, and belongs to the technical field of gold alloy element content detection. According to the method, through combined use of a gravimetric method, an electrolytic method and a titration method, by taking chemical means such as extraction and back extraction, electrochemistry and complex reaction as a theoretical basis, the aim of continuously and accurately measuring gold, silver, copper, lead and zinc in the gold-based alloy can be achieved through one-time sample weighing and sample digestion, the efficiency is improved, the complexity of multiple times of treatment is reduced, and the method is suitable for large-scale popularization and application. The method is accurate and reliable. Different masking agents, buffer reagents, precipitants and the like are selected in a targeted manner to be used in one solution one by one, and the problems that an element method is not applicable, measurement is out of range, and elements interfere with one another are solved.

The invention discloses a method for removing lead and zinc in underground water of a mining area by using carboxymethyl cellulose modified nano zero-valent iron, which is characterized in that the underground water of the lead-zinc mining area is treated by using the carboxymethyl cellulose modified nano zero-valent iron, and the carboxymethyl cellulose modified nano zero-valent iron comprises nano zero-valent iron particles, the surface of the modified nano zero-valent iron is modified with carboxymethyl cellulose, and the mass ratio of the carboxymethyl cellulose to the iron element in the modified nano zero-valent iron is 1: (5-6). According to the invention, the adopted carboxymethyl cellulose modified nano zero-valent iron has the advantages of large specific surface area, many active sites, good mobility, good dispersibility, strong anti-interference capability and the like, can quickly adsorb lead and zinc in the water body, and can stably fix lead and zinc in the carboxymethyl cellulose modified nano zero-valent iron for a long time; the method has the advantages of simple process, low cost, high treatment efficiency, good removal effect, capability of ensuring long-term stability of heavy metal ions and the like, and is particularly suitable for long-term repair and treatment of lead and zinc pollution in underground water in mining areas.

The invention relates to the technical field of industrial flue gas purification, in particular to a method for removing NOX in flue gas through cooperation of iron-extracted and depleted molten lead-zinc slag desulfurization tail liquid and an oxidizing agent, and the method comprises the following steps that S1, iron-extracted and depleted molten lead-zinc slag is ground till the particle size is not larger than 0.075 mm, water is added according to the solid-to-liquid ratio of 1: 200 g / mL, and ore pulp is prepared; s2, flue gas containing SO2 is introduced into the ore pulp, and SO2 in the flue gas is removed; s3, raising the temperature of the desulfurization tail liquid from which SO2 is removed to 25-65 DEG C, adding an oxidizing agent, introducing NOX-containing flue gas, and removing NOX in the flue gas; according to the method, the nitric oxide can be effectively removed by utilizing the desulfurization tail liquid of the molten lead-zinc slag after iron extraction and dilution, so that the comprehensive utilization of resources is realized.

The invention discloses a beneficiation method for tin-silver symbiotic polymetallic ore and application of the beneficiation method, and relates to the technical field of mineral separation. Comprising the steps that after tin-silver symbiotic polymetallic ore is ground, undersize minerals are obtained through a high-frequency screen, silver-copper flotation is conducted on the undersize minerals, and silver-copper concentrate and silver-copper tailings are obtained; the silver-copper tailings are subjected to lead-zinc-sulfur flotation, and lead concentrate and zinc-sulfur tailings are obtained; and the zinc-sulfur tailings are subjected to zinc-sulfur flotation, and zinc-sulfur concentrate and tin-sulfur tailings are obtained. The concentration of ore pulp in the ore grinding process is controlled, it is guaranteed that cassiterite and sulfide minerals are fully dissociated, then a first inhibitor is added in the lead-zinc-sulfur flotation process, the valuable metal recovery efficiency can be enhanced by optimizing the flotation process and collaboratively innovating a reagent formula according to the complex characteristics of tin-silver symbiotic polymetallic ore, and the recovery rate of the tin-silver symbiotic polymetallic ore is increased. The contents of silver, copper and tin in the tailings are obviously reduced, and efficient utilization of resources and reduction of solid wastes are realized.

The invention relates to the technical field of heavy metal adsorption, in particular to a preparation method and application of a heavy metal adsorption material based on lead-zinc tailings, and the preparation method comprises the following steps: S1, grinding the lead-zinc tailings until the particle size is less than 75 microns, and drying; s2, putting the lead-zinc tailings treated in the step S1 into a microwave reactor, and carrying out microwave thermal modification treatment for 5-15 minutes at the power of 600-1000W; s3, the lead-zinc tailings subjected to microwave treatment are soaked in a sodium sulfide solution with the mass concentration being 0.5%-2%, and surface vulcanization treatment is conducted; and S4, heating the lead-zinc tailings subjected to sulfuration treatment to 800-950 DEG C at the speed of 3-10 DEG C / min under the protection of nitrogen, calcining for 1-3 hours, cooling, washing and drying to obtain the heavy metal adsorption material. The adsorption material with a good heavy metal treatment effect is synthesized through microwave thermal modification assisted by surface vulcanization treatment and high-temperature sintering of the lead-zinc tailings.

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.

The invention discloses a novel process for separating tin and lead from low-grade tin-lead-zinc smoke dust produced by a fuming furnace. Low-grade tin-lead-zinc smoke dust produced by treating a low-tin material through a fuming furnace vulcanization volatilization method is used as a raw material, and the method comprises the processes of impurity removal and dezincification, desulfurization by adding a desulfurizing agent, desulfurization and dearsenification by roasting, reduction and precipitation of crude lead, strong reduction smelting treatment in an electric furnace and the like. The invention provides a novel smelting process aiming at a low-grade tin high-lead zinc smoke dust raw material produced by a low-tin material treated by a fuming furnace vulcanization volatilization method, so that the energy consumption cost is greatly reduced, the lead is thoroughly removed, the lead and tin separation effect is good, the technical and economic indexes are further improved, and the smelting efficiency and the economic benefits are improved.

The invention relates to the technical field of non-ferrous metal metallurgy, in particular to a comprehensive recovery method for low-grade lead-zinc oxidized ore resources. According to the method, through a side-blown smelting furnace oxidation process and a fuming furnace reduction process, firstly, pyrometallurgy oxygen-enriched smelting is carried out, high-lead smoke dust and zinc-germanium-containing slag are produced, zinc oxide smoke dust is obtained through fuming reduction volatilization, then the zinc oxide smoke dust enters a zinc hydrometallurgy process, the high-lead smoke dust enters a pyrometallurgy lead smelting process for batching, and the zinc-germanium-containing slag is obtained. And finally, lead metal (rich in silver), zinc metal, germanium concentrate and tailings are generated. The method aims at achieving comprehensive recovery of low-grade lead-zinc oxidized ore resources by improving the recovery rate of lead and zinc in the low-grade lead-zinc oxidized ore and conducting cooperative treatment on silver, germanium and cadmium at the same time, and a new thought is provided for comprehensive recovery and large-scale industrial production of the low-grade lead-zinc oxidized ore resources.

The invention provides a lime-free efficient flotation process for lead-zinc-silver ore, and belongs to the technical field of ore dressing processes. The efficient flotation process solves the problems that in the prior art, the use cost of lime is high, the return water treatment cost needs to be improved, and the product quality needs to be improved. The flotation process provided by the invention has the following effects: the lime consumption is reduced, and the lime cost is saved by about 3 million yuan per year. The product quality is improved, the arsenic impurity content in the zinc concentrate is reduced from 2% to below 0.8%, the economic benefit is improved by about 280,000 yuan per year, the copper grade in the lead concentrate is improved from 1.7% to above 2%, and the economic benefit is improved by about 7,000,000 yuan per year. The pH value in the pond is reduced from 11 to 7, and the surrounding environment of the tailing pond is improved. The Ca < 2 + > concentration in the tailing pond return water is reduced, the pipeline structure influence is reduced, and the production efficiency is improved.

The invention provides a lead zincate niobate-lead zirconate titanate based perovskite ceramic material and a preparation method thereof, the general formula of the chemical composition of the perovskite ceramic material is (1-x) Pb [(Zn1 / 3Nb2 / 3) 0.3 (Zr1 / 2Ti1 / 2) 0.7] O3-xBi (Zn1 / 2Ti1 / 2) O3, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, xlt; 1; a Bi (Zn1 / 2Ti1 / 2) O3 component is introduced into a lead zincate niobate-lead zirconate titanate matrix, local structure distortion is formed in a perovskite structure by utilizing the high polarizability of Bi < 3 + > and the synergistic effect of (Zn1 / 2Ti1 / 2) < 3 + > composite ions, and meanwhile, a long-range ordered perovskite framework is kept; wherein lead zincate niobate-lead zirconate titanate is used as a matrix to provide a high piezoelectric basis, and due to the introduction of Bi (Zn1 / 2Ti1 / 2) O3, a high Curie temperature is kept through a hardness-like effect, so that the material shows more comprehensive and excellent piezoelectric constant and coercive field and excellent wide-temperature piezoelectric thermal stability compared with commercial soft / hard piezoelectric ceramics.

According to the beneficiation method for lead-zinc separation of the lead-zinc sulfide ore containing the extremely low copper sulfide content, the ore pulp is pretreated through the heavy metal ion shielding agent, the zinc blende activity removing agent is added and stirred, and finally the collecting agent is added for collecting the lead ore, the technology is environmentally friendly, and applicability is good. When the lead-zinc sulfide ore with the copper grade not larger than 0.05% is treated, the lead grade of the lead concentrate is 60% or above, the zinc grade is not larger than 6%, the lead recovery rate is 90% or above, the zinc grade of the zinc concentrate is 42% or above, and the zinc recovery rate is 90% or above.

The invention discloses a lead-zinc slag recycling device and method, and relates to the technical field of slag recycling. The device comprises a pretreatment system for crushing and screening lead-zinc slag; the physical sorting unit is used for sorting the lead-zinc slag; the chemical leaching unit is used for leaching the lead-zinc slag to obtain a lead-zinc leaching solution; the metal extraction unit is used for performing metal extraction on the leachate to obtain metal lead and zinc and waste slag liquid; the waste treatment unit is used for detecting and treating harmful substances in the waste slag liquid; and the intelligent control unit is used for carrying out optimization analysis on the recovery process by utilizing artificial intelligence and automatically adjusting an optimal recovery processing scheme. Advanced physical separation, chemical leaching, metallurgical refining and waste treatment technologies are comprehensively applied, and efficient automatic control means are matched, so that the recovery efficiency of lead-zinc slag treatment is remarkably improved, the more efficient recovery treatment effect is achieved, resource waste is reduced, environmental pollution is reduced, and the environment-friendly and green production targets are achieved.

The invention provides a complete parallel flow electrolysis device and method.The device comprises a liquid feeding tank, multiple electrolytic tanks and a liquid return tank which are sequentially arranged, a plurality of first through holes are formed in the side, close to the electrolytic tanks, of the liquid feeding tank, and the multiple electrolytic tanks are sequentially arranged; a plurality of second through holes and a plurality of third through holes are formed in the two sides of each electrolytic cell respectively, a plurality of fourth through holes are formed in the side, close to the electrolytic cells, of the liquid return tank, the first through hole of the liquid supply tank corresponds to the second through hole of the first electrolytic cell, and the second through holes and the third through holes of the adjacent electrolytic cells correspond to one another. And the third through hole of the last electrolytic tank corresponds to the fourth through hole of the liquid return tank. According to the complete parallel flow electrolysis device, parallel and uniform flow of the electrolyte between the polar plates in the electrolysis device is achieved, and the complete parallel flow electrolysis device can be used for electrolysis of metals such as copper, lead, zinc, nickel and manganese.

Aiming at the problem of low resource utilization value of the existing copper slag, the invention discloses a method for resourceful treatment of the copper slag, through a pyrogenic process and wet process mineral separation coupling method of high-temperature reduction, selective corrosion, magnetic-gravity combined separation and selective leaching, the transformation form and trend of key elements are accurately regulated and controlled, and the utilization rate of the copper slag is improved. The purposes of extracting lead, zinc, iron, copper and silicon elements in the copper slag step by step and converting the elements into corresponding high-value products are achieved. In addition, through process optimization and improvement, a low-temperature reaction system and a reagent cyclic regeneration mechanism are adopted, energy and chemical consumption is effectively reduced, generation of secondary hazardous waste is basically eradicated, and a new solution path is provided for green, high-value and efficient utilization of metallurgical solid waste.

The utility model discloses a system for recovering lead and silver in zinc-sulfur separation tailings. The concentrate outlet of a zinc-sulfur separation flotation machine is connected with a feed port of a zinc concentration flotation machine, the tailing outlet of the zinc-sulfur separation flotation machine is connected with a feed port of a zinc scavenging flotation machine, the tailing outlet of the zinc scavenging flotation machine is connected with a feed port of an inclined plate thickener; the liquid discharge port of the inclined plate thickener is connected with a water inlet of a return water system, the ore discharge port of the inclined plate thickener is connected with a feed port of a lead roughing flotation machine, the lead roughing flotation machine is connected with a discharge port of a sulfide ore powder ore bin, the tailing outlet of the lead roughing flotation machine is connected with a feed port of the lead scavenging flotation machine; the concentrate outlet of the zinc concentration flotation machine and the tailing outlet of the lead scavenging flotation machine are connected with a feed port of a zinc roughing ore selection system. After dehydration, the tailings from the zinc-sulfur separation of oxide ore are mixed with sulfide ore powder for lead selection. This can effectively recover the lead, zinc and silver in the tailings from the zinc-sulfur separation of oxide ore without affecting the recovery effect of the original sulfide ore system.

The present invention provides a zinc smelting method, comprising the following steps: mixing zinc-lead materials, urban minerals and a regulator to obtain a mixed material; the elements and element mass fractions in the mixed material include: 10-50% lead, 10-40% zinc, and 2-15% copper; adding the mixed material to a molten pool reduction furnace, and after the mixed material is melted, a zinc-lead-copper melt entering the molten pool of the molten pool reduction furnace and a bed material maintained in situ are obtained; a first reaction gas, a zinc-lead-copper melt and a bed material are introduced into the molten pool, and a crude lead alloy, zinc vapor and slag are obtained through a reduction reaction; wherein the reduction reaction is carried out under non-oxygen-enriched conditions, the oxygen content in the atmosphere in which the reduction reaction is carried out is 0-20%, and at least one of the first reaction gas and the regulator includes a reducing agent. The present invention can selectively reduce the mixed material under non-oxygen-enriched and low reducing power conditions by controlling the ratio of the mixed material and the slag, thereby effectively improving the direct recovery rate of valuable metals and zinc.

The invention discloses a method for low-alkalinity flotation of lead-zinc (silver-containing) polymetallic ore based on a heterocyclic sulfydryl coordination polymer, which comprises the following steps of: adjusting the pH value of ore pulp to 7.5 + / -0.3, and sequentially carrying out roughing, scavenging and concentration by adopting a composite collecting agent according to a gradient flotation procedure; wherein the mass concentration of the ore pulp is 20-40%; the adding amount of the composite collecting agent is 150-300g / t of ore pulp; the composite collecting agent is composed of a modified heterocyclic sulfhydryl compound, C12-C18 alkylamine polyoxyethylene ether and a star-shaped branched nonionic surfactant according to the mass ratio of 1: (1-3): (0.5-2). According to the method, the complex silver polymetallic ore is subjected to efficient flotation under the low-alkalinity condition by applying the composite collecting agent based on the heterocyclic sulfydryl coordination polymer. Through deep exploration and optimization of a flotation reagent system, process parameters and a microcosmic action mechanism, the recovery rate of metal such as silver, copper and lead is remarkably increased, and the ore dressing cost is greatly reduced.

The invention relates to an iron ion inhibitor composition and application thereof. The iron ion inhibitor composition is prepared by combining 2 to 2.5 parts of soluble salt of oxalic acid, 1 to 1.5 parts of ammonium phosphate compound and 1.0 to 1.5 parts of triethanolamine. The iron ion inhibitor composition can be added in the ore grinding process, after ore grinding or in the flotation pulp mixing process of copper-lead-zinc oxide minerals, and then conventional flotation pulp mixing and flotation separation operation is carried out. The concentration of iron ions in ore pulp can be effectively reduced, iron species adsorbed on the surface of the ore can be stripped, accordingly, the flotation recovery rate and the concentrate grade of the copper-lead-zinc oxide ore are remarkably improved, agent consumption is reduced, and the method has the advantages of being simple in process, wide in applicability and the like.

The application discloses application of a combined inhibitor in associated gold-silver-lead-zinc sulfide ore flotation separation, wherein the combined inhibitor is a combination of zinc sulfate and methionine, and the mass ratio of the two combined is 2:1; the combined inhibitor is used to realize associated gold-silver-low-copper-lead-zinc polymetallic sulfide ore flotation separation in a low-alkali environment, has a good separation effect, high concentrate grade, effectively reduces the zinc content of lead concentrate, improves the gold and silver recovery rate in the lead concentrate, and has important significance for improving the quality and efficiency of associated gold-silver-low-copper-lead-zinc polymetallic sulfide ore flotation separation. In addition, the methionine in the combined inhibitor is a small-molecule organic substance, is non-toxic and non-polluting, and is easy to degrade, thereby avoiding the problems of traditional inhibitors, such as toxicity, environmental unfriendliness and human body unfriendliness. The combined inhibitor has small dosage, stable effect, and good process application prospect.