443 results about "Pyrite" patented technology

The invention discloses a preparation method of high-polarization bismuth ferrite-lead titanate-barium zirconate titanate-based ferroelectric ceramic, which comprises the following steps: preparing oxide raw materials according to the chemical formula of the bismuth ferrite-barium titanate ceramic-based ferroelectric ceramic, mixing to obtain mixed powder, pre-sintering the mixed powder to obtain pre-sintered powder, granulating the pre-sintered powder to obtain granules, and sintering the granules to obtain the high-polarization bismuth ferrite-lead titanate-barium zirconate titanate-based ferroelectric ceramic. Performing compression molding on the granules to obtain a green body, performing degumming sintering on the green body to obtain sintered ceramic, and performing annealing treatment on the sintered ceramic to obtain the bismuth ferrite-lead titanate-barium zirconate titanate based ferroelectric ceramic. According to the invention, annealing treatment is carried out on sintered ceramic, after annealing treatment, defect dipoles generated by volatilization of Pb and Bi in the ceramic are rearranged under the action of a temperature field, relaxor ferroelectric-ferroelectric phase change occurs in a ceramic phase, a ferroelectric hysteresis loop reflects that the girdling of the loop is opened, and the rectangularity is increased; a bipolar strain curve is converted into a typical butterfly shape of ferroelectric from a bud shape, and the ferroelectricity of the ceramic is further greatly improved.

The invention discloses a high-efficiency sulfur-iron-based nitrogen and phosphorus removal and autotrophic denitrification composite filler and a preparation method thereof. The high-efficiency sulfur-iron-based nitrogen and phosphorus removal and autotrophic denitrification composite filler is characterized by comprising the following raw material components in percentage by mass: 1-60% of activated pyrite powder, 30-95% of sulfur, 1-10% of trivalent iron salt and 1-10% of limestone powder. And forming through a thermal compounding process. The preparation method comprises the following specific steps: firstly, activating the pyrite and the magnetic pyrite at high temperature under the protection of protective gas; sulfur is heated to be in a molten state; uniformly mixing the activated pyrite powder, trivalent iron salt and limestone powder to obtain a powdery mixed material; adding the powdery mixed material into molten sulfur, raising the temperature to 125-145 DEG C, and fully and uniformly mixing; and finally, cooling and curing the obtained material to obtain the autotrophic denitrification composite filler. According to the high-efficiency sulfur-iron-based autotrophic denitrification nitrogen and phosphorus removal composite filler prepared by the preparation method, pyrite is calcined and activated, ferric iron salt is used as an oxidizing agent to promote decomposition of the activated pyrite, and the electron donor release capability of the pyrite is improved, so that the high-efficiency nitrogen and phosphorus removal effect of the filler is realized.

The invention discloses an experimental device and method for controlling migration and mineralization of ore-forming fluid in a wrinkle deformation process, and belongs to the technical field of ore deposit geology. The device comprises an ore liquid synthesis unit and a mechanical deformation simulation and mineralization analysis unit. The mechanical deformation simulation unit comprises a box body, an extrusion deformation system, a liquid injection system and a heating temperature control system, and can synchronously realize visual analysis of structure extrusion, fluid injection and mineralization precipitation at high temperature. The experimental method comprises the following steps: firstly, preparing a simulated metallogenic fluid containing FeS2 (pyrite); laying simulated surrounding rock and wrinkles in the box body, arranging a separation layer, and heating; extruding the sand layer and injecting fluid to simulate a mineralization process; and slicing, sampling and analyzing after model consolidation, and establishing a mineralization space distribution model. The device is simple in structure and convenient to operate, the whole process of fold extrusion, crack extension, fluid migration and mineral precipitation can be repeatedly represented, and an experimental basis is provided for hydrothermal deposit mineralization mechanism research and prospecting prediction.

The invention provides application of sodium 2, 3-dimercaptopropanesulfonate as an inhibitor in low-alkalinity copper-sulfur flotation separation, and relates to the technical field of mineral separation. When the compound serves as an inhibitor, the compound, a collecting agent and a foaming agent are prepared into a composite flotation reagent and used for low-alkalinity flotation separation of chalcopyrite and pyrite, flotation separation is conducted through the steps of one-time roughing, at least one-time scavenging and at least one-time concentration after ore grinding and grading, and copper concentrate is collected; the method can effectively solve the problems that the copper-iron separation effect is poor in the process of flotation separation of the chalcopyrite and the pyrite, the copper recovery rate is low due to addition of a large amount of lime and the like, the chalcopyrite and the pyrite can be efficiently separated under the low-alkalinity condition through the specific flotation process, and the flotation effect on the chalcopyrite is improved.

The invention discloses a composition for deeply removing trivalent arsenic in wastewater from an iron-based mineral aggregate and application of the composition. The composition comprises an iron-oxidizing bacteria solution and an iron-based mineral aggregate, the iron-based mineral aggregate comprises red mud and pyrite, and the mass ratio of the red mud to the pyrite is 1: (0.9-1.1). When the composition is used for deeply removing trivalent arsenic in wastewater, the process comprises the following steps: culturing iron-oxidizing bacteria to a logarithmic phase, centrifuging, washing and resuspending to obtain an iron-oxidizing bacteria solution; the method comprises the following steps: adding a composition containing an iron-oxidizing bacteria solution and an iron-based mineral aggregate into wastewater containing trivalent arsenic to carry out arsenic removal reaction, and separating after the reaction is finished. According to the composition, the synergistic effect of all the components is utilized, the oxidation-adsorption-precipitation process of trivalent arsenic in wastewater is achieved through a one-step method, no strong oxidizing agent needs to be added for pre-oxidation treatment, especially when the arsenic concentration in the wastewater is 20-200 mg / L, the excellent removal effect is achieved, and the trivalent arsenic removal efficiency can reach 90%.

The utility model discloses a treatment device capable of accelerating starting of autotrophic denitrification of pyrite, and belongs to the technical field of sewage treatment. The Fe < 3 + > dosing unit comprises a Fe < 3 + > dosing tank (4) and a dosing pump (6); according to the water inlet unit, an aeration head (2) is arranged in a raw water tank (3), the aeration head (2) is connected with a nitrogen cylinder (1) through a valve, filler filled in the reactor is modified pyrite filler particles and modified ceramsite, the bottom of the reactor is connected with an aeration pump, and a Fe < 3 + > dosing tank (4) is connected with a water inlet (7) in the bottom of the reactor (13) through a dosing pump (6). The method comprises the following steps: aerating sludge, standing, discharging water, and adding ferric iron into the water subjected to nitrogen aeration treatment to carry out accelerated reaction. By adopting the technology of the utility model, the starting can be quickly carried out for more than 10 days.

The utility model provides harmless treatment equipment for arsenic-calcium slag. The harmless treatment equipment comprises a mixer, a medium-temperature volatilization furnace, a high-temperature decomposition furnace and a tail gas purification device, the mixer is provided with a mixed material inlet and a mixed material outlet, and the mixed material inlet is used for inputting arsenic-calcium slag and pyrite. The medium-temperature volatilization furnace is provided with a volatilization furnace material inlet, a volatilization furnace gas inlet, a volatilization furnace gas outlet and a volatilization furnace tailing outlet. And the volatilization furnace material inlet is connected with the mixed material outlet. The high-temperature decomposing furnace is provided with a decomposing furnace material inlet, a decomposing furnace gas inlet, a decomposing furnace gas outlet and a decomposing furnace tailing outlet. The material inlet of the decomposing furnace is connected with the tailing outlet of the volatilization furnace. The tail gas purification device is provided with a purification inlet and a purification outlet, and the purification inlet is connected with the volatilization furnace gas outlet and the decomposition furnace gas outlet. The harmless treatment equipment for the arsenic-calcium slag can effectively remove arsenic in the arsenic-calcium slag, avoid arsenic pollution, improve the utilization rate of pyrite and save cost and heat.

The invention provides a uranium-containing ore pulp efficient electro-Fenton activation leaching material based on peat and pyrite and an activation method, and belongs to the fields of inorganic nanometer material application and uranium purification and conversion. According to the leaching material, woody peat and natural pyrite particles are subjected to ball milling, so that uniform mixed powder is obtained, then reaction is conducted under the hydrothermal condition, steam chambering and activating treatment is conducted under the high-temperature condition, and the modified peat-pyrite iron-containing nano composite material with good catalytic activity is prepared; the material can effectively promote generation of an oxidizing agent in an electro-Fenton reaction, so that oxidation and dissolution of uranium are accelerated, U (IV) in uranium ore is rapidly converted into U (VI) with higher mobility, and the material has the advantages of being high in uranium resource recovery rate, small in environmental pollution, economical, applicable and the like, is suitable for efficient activation of uranium-containing ore pulp and has good application prospects. And an effective scheme is provided for sustainable development of uranium resources.

The invention provides a method for preparing high-purity manganese sulfate by taking pyrolusite and pyrite as raw materials, which comprises the following steps: carrying out reduction reaction on the pyrolusite and the pyrite by adopting acid leaching to obtain a manganese sulfate solution, and continuously feeding the pyrolusite until ferrous ions in the system are completely oxidized into iron ions; adding a pH regulator to remove iron, adding a vulcanizing agent to remove heavy metals, adding a pH regulator to remove silicon and aluminum, and carrying out solid-liquid separation to obtain a manganese sulfate solution containing calcium and magnesium; adding a fluorinating agent into the manganese sulfate solution containing calcium and magnesium to remove calcium and magnesium, and carrying out solid-liquid separation to obtain a fluorine-containing high-purity manganese sulfate solution; and extracting the fluorine-containing high-purity manganese sulfate solution to obtain a fluorine-containing organic phase and battery-grade high-purity manganese sulfate. According to the method, the medicament cost in the removal process is greatly reduced, namely, the raw material pyrolusite is used for replacing an external oxidant to oxidize Fe < 2 + > in a system, and a large amount of jarosite and sodium jarosite are generated in situ, so that complete removal of potassium, sodium and iron is realized.

The invention discloses a tetracycline hydrochloride-containing wastewater treatment method in the field of wastewater treatment, which comprises the following steps: introducing tetracycline hydrochloride-containing wastewater into a reactor, adding a multilevel structure iron and iron sulfide composite carbon material, and adjusting the system to a nearly neutral condition; then adding potassium peroxymonosulfate composite salt, starting a direct current system, and carrying out catalytic degradation reaction under specific current density; and finally recovering the catalyst through magnetic field separation. The preparation method comprises the following steps: grinding pyrite and hematite, ball-milling and mixing the ground pyrite and hematite with orange peel powder and sodium hydroxide, and carrying out microwave pyrolysis, acid washing and drying, hydrogen peroxide surface treatment and the like to obtain a final product. According to the method, efficient degradation of tetracycline hydrochloride under the neutral condition is achieved, the catalyst can be magnetically recycled, secondary pollution is avoided, and the method has the advantages of being low in cost, easy and convenient to operate, environmentally friendly and the like.

The invention relates to the technical field of material detection and analysis, and discloses a pyrite classification test method, which comprises the following steps: crushing and grinding a to-be-detected sample to prepare a standard detection sample; performing parameter detection on the standard detection sample to obtain spectrum time sequence data, component analysis data and microscopic image data; extracting spectral dynamic characteristics from the spectral time sequence data, extracting component composition characteristics from the component analysis data, extracting microscopic morphological characteristics from the microscopic image data, and then generating a phase determination index and a core characteristic subset; determining a phase classification result through a tree classification decision model according to the core feature subset; and generating a confidence label of a phase classification result according to the phase judgment index, and performing parameter detection on the standard detection sample again when the phase judgment index is lower than a preset threshold value. And the pyrite classification efficiency and accuracy are improved.

The application discloses a kind of synchronous denitrification and phosphorus removal light materials and its preparation and application method, belong to environmental functional materials and sewage treatment technical field.The application is obtained by fully melting and dispersing sulfur and iron-based component, and the iron-based component is a mixture of pyrite and calcium-magnesium carbonate.The molten mixture is foamed to form a synchronous denitrification and phosphorus removal light material.The synchronous denitrification and phosphorus removal light material has high porosity, large specific surface area, light weight and high reactivity.The light material is used as a microbial carrier and an electron donor for biochemical reactions, and is applied to fixed bed, fluidized bed and other reactors for sewage treatment.The light material has good microbial adhesion performance, high denitrification rate and good phosphorus removal effect.

The invention discloses a grading magnetic-flotation combined beneficiation method for sulfur-oxygen mixed copper ore. The grading magnetic-flotation combined beneficiation method comprises the steps of ore grinding and screening, magnetic separation, grading, copper sulfide flotation, copper oxide roughing and copper oxide enhanced scavenging. According to the method, strong magnetic separation is adopted in the mill grading system to recover part of coarse-grain copper oxide, excessive grinding of copper oxide minerals in the ore grinding process is reduced, early recovery can be achieved, the comprehensive recovery rate of copper oxide is increased, meanwhile, release of copper ions in the ore grinding process is reduced, and the adverse effect on follow-up copper sulfide flotation is relieved. The efficient copper oxide vulcanizing agent is composed of sodium sulfide and sodium pyrosulfite, the stability of a film in the vulcanizing process is enhanced, meanwhile, the inhibition effect on pyrite is enhanced, and the flotation separation efficiency of copper oxide is improved. In addition, by adopting an efficient reagent and precise regulation and control, copper oxide concentrate is directly obtained through open circuit of copper oxide roughing and enhanced scavenging concentrate, and the copper metal falling loss caused by closed cycle is reduced.

The present invention relates to the technical field of desulfurization of coal gangue, specifically a high-sulfur coal gangue separation and desulfurization device and process; the steps of the process are as follows: S1: Screen and crush the high-sulfur coal gangue to less than 30 mm to effectively separate the pyrite and gangue in the coal gangue; S2: Feed the crushed high-sulfur coal gangue below 30 mm into the separation and desulfurization device for separation treatment. Due to different specific gravities, it is separated into primary pyrite, pure gangue, medium coal, and power coal by jigging gravity separation; the medium coal is washed again; the process provided by the present invention obtains primary pyrite, pure gangue, and power coal through preliminary crushing and separation of high-sulfur coal gangue; then the primary pyrite is crushed and separated again to obtain pyrite and gangue; the pyrite is directly sold, the pure gangue is backfilled for land reclamation, and the power coal is directly sold; in this way, the process thoroughly treats the high-sulfur coal gangue, and all classified materials can be comprehensively utilized.

The invention belongs to the technical field of comprehensive utilization of metallurgical and chemical resources, and discloses a method for improving the productivity of magnet powder and sulfuric acid by adding pyrite in copper smelting. According to the method, a heat release rate, SO2 generation kinetics and an iron oxide phase change path are synergistically optimized by constructing a gradient blending mechanism of pyrite and an in-furnace oxygen potential directional oxidation regulation and control system. The method is characterized in that on the basis of real-time feedback of the molten pool temperature, the flue gas SO2 concentration and the slag phase FeO activity, the pyrite blending rate, the granularity and the carrier gas oxygen concentration are dynamically regulated and controlled in a staged mode; a reduction microenvironment in which logpO2 is approximately equal to-11 is created on a slag-sulfonium interface, and growth of Fe3O4 crystal nucleus is promoted; and the flue gas cooling and acid-making gas inlet stability is optimized. According to the method, the capacity of the magnet powder and the capacity of the sulfuric acid are synchronously improved, the stability and the high efficiency of the copper smelting main process are guaranteed, and an engineering-oriented technical path is provided for comprehensive utilization of resources of copper smelting enterprises.

A bioretention pond includes a pond body and an overflow weir. The pond body includes a pond wall and a layered substrate. The layered substrate includes from bottom to top: a gravel layer, a transition layer, a pyrite layer, a plant layer, a pebble water layer, an organic layer, and a water storage layer. The overflow weir is disposed on the pebble water layer with a space left above the center of the pebble layer. The organic layer is disposed in the space and covers the pebble layer. The water storage layer is disposed onto the organic layer. The pond body further includes a perforated pipe disposed in the gravel layer; and the perforated pipe includes an outlet end disposed at the top part of the pyrite layer.

The present application relates to the field of lithium-ion battery preparation, and provides a method for synthesizing a ferrous sulfide material from a pyrite raw material and an application. A pyrite raw material is crushed and then physically mixed with iron powder and carbon source powder, and is heated in an inert atmosphere to obtain ferrous sulfide powder; the ferrous sulfide powder is mixed with deionized water and then subjected to wet ball milling and high-speed fine grinding to obtain a ferrous sulfide suspension; then, the ferrous sulfide suspension is spray-dried to obtain a precursor of ferrous sulfide microspheres, and the precursor is annealed to obtain a ferrous sulfide material. In the present application, the ferrous sulfide material is applied to a lithium-ion battery to serve as an active material of a negative electrode. By introducing a reducing agent, the present application can solve the problem in conventional methods that pyrite cannot be directly used to synthesize ferrous sulfide due to the presence of an impurity phase. In addition, the present application involves low costs, a simple process and low energy consumption, and is environmentally friendly and easy to realize large-scale production.

The invention discloses an in-situ remediation method for uranium pollution and application of the in-situ remediation method. According to the in-situ remediation method for uranium pollution, pyrite is driven to be hydrolyzed, oxidized, subjected to atomic rearrangement and biomineralized through interaction of microorganisms and pyrite, uranium pollutants are fixedly sealed and stored in reconstructed product iron oxide lattices, uranium pollution areas are remedied, and the microorganisms comprise one or more of brucella, geobacter and clostridium. If the uranium polluted area contains microorganisms, natural humus is used as an electron donor to stimulate in-situ microorganisms. The natural humus solution is injected into the uranium polluted area in a circulating pumping and injecting mode, in-situ microorganisms are stimulated, the concentration of the natural humus solution is 0.05-5 g / L, and the dosage of the natural humus solution is 5-500 g / day. According to the method, in-situ minerals, microorganisms and geochemical resources are fully considered and reasonably utilized, the engineering cost is saved by means of the in-situ occurrence interaction relation of the minerals and the microorganisms, and the remediation efficiency is high.

In one aspect, a preparation method of iron phosphate includes: mixing pyrite cinder and an sulfite evenly in water to obtain a first mixed system; adding phosphoric acid and a buffer to the first mixed system to perform a leaching reaction; performing a first solid-liquid separation on a slurry obtained from the leaching reaction to obtain a first filtrate and a first residue; introducing air into the first filtrate and then performing a first stirring reaction on the first filtrate; performing a second solid-liquid separation on a slurry obtained from the first stirring reaction to obtain a second filtrate and a second residue; and calcining the second residue to obtain iron phosphate.

The present invention relates to the field of coal gangue processing technology, and in particular to a system and method for sorting clean coal and pyrite in coal gangue, comprising a pretreatment mechanism, a screening mechanism, a sample analysis mechanism, and an intelligent sorting mechanism, wherein the intelligent sorting mechanism comprises a frame body, a first sorting section, a second sorting section, and an execution controller, wherein the first sorting section and the second sorting section are sequentially arranged on the frame body from top to bottom, and the execution controller is used to control the first sorting section and the second sorting section to sort the ore; the pretreatment mechanism, the screening mechanism, and the intelligent sorting mechanism are sequentially connected, and the sample analysis mechanism is communicatively connected to the execution controller. The sorting system first screens and grades the coal gangue according to the presence form of pyrite in the coal gangue, and then intelligently sorts the graded coal gangue, effectively solving the problems of low grade, low sorting efficiency, and difficulty in large-scale production in the process of directly selecting coal and pyrite in coal gangue mainly by gravity separation and flotation.

The invention discloses a process method for preparing high-spinning nano pyrite through physical field-chemical method coupling regulation and control, which comprises the following steps: dissolving bovine serum albumin in deionized water, adding an iron source, uniformly mixing, adjusting the pH value of the solution to 10.0-11.0, adding a sulfur source, and uniformly mixing, thereby obtaining the high-spinning nano pyrite. Carrying out a coupling regulation reaction of a physical field and a chemical method on the reaction system under the protection of inert gas, and then dialyzing and purifying to prepare the high-spin-state FeS2 nanosheet. The chemical method comprises one or more of a coprecipitation method, a solvothermal method and a hydrothermal method; the physical field comprises one or more of an alternating magnetic field, a static magnetic field and a rotating magnetic field. Through coupling regulation and control of a physical field and a chemical method, accurate conversion of the FeS2 nanosheet from a low spinning state to a high spinning state is realized, chemical doping can be effectively avoided, natural biological suitability of FeS2 is reserved, and the method has a good clinical conversion application prospect.

The invention discloses a collaborative recovery device and method for pulverized coal, pyrite and tailings in high-sulfur coal gangue, and belongs to the technical field of solid waste resource utilization. The device comprises a flotation box body, a coal gangue slurry input mechanism, an aeration mechanism, a pulverized coal collecting hopper, a tailing collecting hopper and a pyrite collecting hopper, and a slurry output port of the coal gangue slurry input mechanism penetrates through the left side wall of the flotation box body and horizontally extends into the flotation box body; the aeration mechanism penetrates through the left side wall of the flotation box body and extends into the flotation box body, the pulverized coal collecting hopper is fixedly installed on the upper portion of the right side wall of the flotation box body, a pulverized coal discharging port communicated with the pulverized coal collecting hopper and the interior of the flotation box body is formed in the right side wall of the flotation box body, and the bottom edge of the pulverized coal discharging port is higher than the bottom face of the pulverized coal collecting hopper. According to the invention, the device and the method are matched, so that the pulverized coal, the pyrite and the tailings in the high-sulfur coal gangue are effectively and efficiently separated, the resource utilization rate of the high-sulfur coal gangue is enhanced, and the resource waste is reduced.

The invention discloses a preparation method of a composite biological nitrogen and phosphorus removal filter material, and relates to the technical field of sewage treatment. The preparation method of the composite biological nitrogen and phosphorus removal filter material comprises the following steps: loading sulfur and pyrite with oyster shells to prepare an integrated composite biological carrier with a foaming structure; sulfur loaded in the oyster shells can provide electrons for the denitrification nitrogen removal process; pyrite in the structure is rich in iron element, and can also participate in auxiliary phosphorus removal while providing nitrogen removal electrons; meanwhile, the foamed porous structure of the novel filter material is also beneficial to improving the specific surface area of a carrier, and bacteria can be efficiently and rapidly enriched; according to the present invention, the oyster shell is adopted as the carrier of the filler, the organic matter component is adopted as the slow release carbon source to provide a part of electrons so as to achieve heterotrophic denitrification, and the calcium carbonate component in the oyster shell can provide alkalinity so as to make up the insufficient alkalinity problem during the autotrophic denitrification process;

The application discloses a low-alkalinity inhibitor for pyrite in secondary copper-sulfur ore and a method. The method comprises the following steps: adding trisodium trithiocyanate in the process of ore grinding; and adding a second inhibitor to adjust the pH value of the ore slurry to 9.5-10.5 in the process of flotation. The second inhibitor is calcium oxide and an organic copolymer, the organic copolymer is an acrylamide-acrylic acid-maleic anhydride copolymer, and the molecular weight of the organic copolymer is 5000-10000. The method can reduce the activation of copper ions on pyrite, realize low-alkalinity inhibition of pyrite, and avoid problems such as high pH value of mineral processing waste water, easy pipe blockage, and low recovery rate of precious metals.

The invention discloses a method for analyzing an existence form of an As element in pyrite based on multi-method combination. The method comprises the following steps: S1, selecting pyrite particles containing multi-stage annular bands as a to-be-detected object; s2, carrying out electron probe analysis, and delineating a further analysis area; s3, the substitution property of As to Fe or S is judged, and the existence form of the As element is preliminarily judged; s4, performing focused ion beam processing and spherical aberration transmission electron microscope analysis, and shooting HAADF and ABF images; and S5, analyzing the spherical aberration transmission electron microscope image by using DigilMicrograph data processing software, and analyzing the intensity difference of Z-contrast microscopic images of different atomic sites and the atomic space occupation abnormal conditions of heavy elements and light elements in the ABF image. Based on the combination of the electron probe and the spherical aberration transmission electron microscope, the existence form of the As element in the pyrite is finely analyzed from the micron scale to the nanometer scale, the credibility is high, and the substantive evidence is sufficient.

The invention discloses a high-sulfur iron ore concentrate pellet desulfurizing agent and a method for strengthening high-sulfur iron ore concentrate pellet desulfurization, and belongs to the technical field of iron ore pellet production. The high-sulfur iron ore concentrate pellet desulfurizing agent comprises calcium peroxide powder, direct reduction iron powder dust and manganese dioxide powder, the desulfurizing agent participates in pyrite-containing iron ore pelletizing, obtained green pellets are sequentially subjected to forced air drying, preheating and roasting, and finished pellets are obtained. According to the method, the desulfurization efficiency of the high-sulfur iron ore concentrate pellets in the drying and preheating process can be remarkably improved through the desulfurizer, and meanwhile the technical problem that the pellet strength is reduced due to the fact that a large amount of SO2 is adsorbed when the pellets are dried and sulfate shells are formed on the surfaces of the pellets can be solved by removing air draft drying. The method is simple to operate, low in production cost and environment-friendly, and meets the requirements of industrial production.

The invention relates to the technical field of sewage treatment, and discloses a preparation method of a porous ceramic loaded sulfur-based composite filler and application of the porous ceramic loaded sulfur-based composite filler in nitrogen and phosphorus removal of sewage. Porous ceramic is taken as a carrier, active components are loaded in a layered manner by adopting a gradient filling process, an inner-layer siderite composite gel and calcite complex dynamically neutralizes H < + > generated by sulfur autotrophy, and pH buffering is realized through sulfo group reversible proton exchange; the compressive strength of the middle-layer pyrite composite gel is improved through C-O-Fe bonding, a Pi-Pi conjugate electron pathway is constructed by polypyrrole-coated hybrid gel, electron transfer is accelerated, and Fe < 2 + > is released to precipitate phosphate; sulfur-charcoal on the outer layer forms nano sulfur crystals, and denitrification is quickly started by utilizing a high specific surface area. Sulfur consumption and sulfate accumulation are reduced through sulfur-iron oxidation-reduction circulation. The filler realizes high-efficiency nitrogen and phosphorus removal of sewage under the condition that a carbon source and a pH regulator are not required to be additionally added.

The invention discloses a pyrite coupled corncob mixed nutritional denitrification vertical flow artificial wetland system, relates to the field of sewage treatment and water ecological restoration, and relates to an artificial wetland. The invention aims to solve the problem that nitrate nitrogen pollutants in farmland recession enter peripheral surface water and underground water due to excessive application of nitrogen fertilizer. The artificial wetland system consists of wetland plants, a coarse sand layer, a functional layer and a gravel layer from top to bottom. According to the iron ore coupled corncob mixed nutritional denitrification vertical flow constructed wetland system, full supply of autotrophic and heterotrophic electron donors is realized in the integrated vertical flow constructed wetland, and high-efficiency treatment of wastewater with different types of carbon-nitrogen ratios is facilitated. The nitrate nitrogen removal rate and the TN removal rate can exceed 98% and 90% respectively.

The invention relates to the field of metallurgical solid waste resource utilization, and particularly provides a method for recycling valuable metals in tungsten smelting slag. The method comprises the following steps: (1) mixing tungsten smelting slag containing W, Ni, Co and optional Cu, molybdenum smelting slag containing Mo and Cu, a carbonaceous reducing agent and pyrite to obtain a mixture; and (2) the mixture is subjected to reduction vulcanization smelting, a smelting product comprising an alloy phase, a sulfonium phase and a slag phase is obtained, W, Mo, Co and Ni are enriched in the alloy phase, and Cu is enriched in the sulfonium phase. According to the method, the smelting temperature can be reduced, valuable metal can be efficiently recycled, additional fluxing agents do not need to be added, the distribution state of the metal can be optimized, and then the recycling cost is reduced.

This invention relates to a method for the recovery of metal from a material comprising: contacting a material with a first reagent comprising a thiocarbonyl group and a second reagent under various conditions. The metal may be a base metal, a precious metal, or a combination thereof. The conditions include, but are not limited to, recovery in the presence of a microbe; optimal material size and / or shape; geolocation parameters; elemental sulfur; added pyrite; or a combination thereof.