387 results about "Pyrite" patented technology

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 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 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 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 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 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 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.

The invention relates to a method for regulating and deacidifying in a bioleaching process of low-grade copper sulphide ore, aiming at the problem of excessive acid caused by excessive oxidation of pyrite in a dump leaching system, a thiocyanate bactericide is added into the bioleaching system of the low-grade copper sulphide ore, and the thiocyanate bactericide is dissolved in a spray liquid of the bioleaching system, and is added into the spray liquid of the bioleaching system; under the catalytic action of mineral leaching microorganisms, oxidation of ferrous ions is enhanced, so that the oxidation-reduction potential of a solution is increased, oxidation of pyrite is intensified, acid accumulation is excessive, the thiocyanate bactericide can remarkably inhibit the activity of part of sulfur-oxidizing bacteria and even kill part of sulfur-oxidizing bacteria, and therefore the activity of ferrous oxide is reduced; compared with the prior art, the method has the advantages that the sulfur oxidation activity of microorganisms is greatly influenced, but the oxidation influence on iron is relatively small, so that the acid leaching is reduced under the condition that the copper leaching of the copper sulfide ore is not influenced, the copper leaching is not influenced, the acid leaching is reduced, the production cost is reduced, the environmental influence is reduced, and the like.

The invention provides a sulfur-pyrite synergistic nitrogen and phosphorus removal composite filler as well as a preparation method and application thereof. The sulfur-pyrite synergistic nitrogen and phosphorus removal composite filler is of a three-dimensional porous structure prepared by melting and granulating sulfur and pyrite. Firstly, pyrite powder is subjected to acidification pretreatment, surface oxides are washed away, the pyrite powder is added into molten sulfur after being dried and screened, the pyrite powder is rapidly stirred to be uniform, and the pyrite powder is naturally cooled to be prepared into composite particles. Sulfur and pyrite with the main component of FeS2 in the composite filler serve as electron donors for autotrophic denitrification, iron ions generated through oxidation can react with phosphate radicals to form iron phosphate precipitates, and therefore the purpose of synchronous nitrogen and phosphorus removal is achieved.

The application discloses a beneficiation method for comprehensively recovering niobium, rare earth and pyrite from low-grade niobium ore, and comprises the following steps: (1) grinding: grinding the niobium ore after crushing to a fineness of 85% to 87% of 0.038 mm, and then adjusting the ore pulp concentration to 25% to 30%; (2) pre-concentration by strong magnetic separation; (3) re-concentration of the rough magnetic separation concentrate by gravity separation; (4) re-separation of the middling concentrate; and (5) flotation separation of the gravity separation concentrate: combining the gravity separation concentrate 1 in the step (3) and the gravity separation concentrate 2 in the step (4) to obtain a gravity separation concentrate, wherein the gravity separation concentrate is a mixed concentrate rich in niobite, rare earth and pyrite; and after the gravity separation concentrate is adjusted into an ore pulp with a concentration of 25% to 35%, the ore pulp is subjected to flotation separation. The application is aimed at the multi-metal low-grade niobium ore with niobite, rare earth and pyrite being associated, realizes efficient separation among the niobium ore, the rare earth ore, the pyrite ore and the gangue ore, and achieves the purpose of comprehensively recovering the niobite, the rare earth and the pyrite.

The present invention belongs to the field of wastewater denitrification and phosphorus removal, and specifically relates to a novel magnetic pyrite filler and its application in wastewater denitrification and phosphorus removal. The invention comprises the following components by weight: 15-25 parts of pyrite powder, 12-15 parts of modified powder, 1-3 parts of calcium sulfide, 5-8 parts of sodium lignin sulfonate, 100-120 parts of deionized water, and 150-200 parts of mixed bacterial solution. The invention comprises the following steps: mixing the pyrite powder with the modified powder and calcium sulfide, stirring, adding sodium lignin sulfonate and deionized water, stirring, granulating, drying, heating to 350-400°C, and keeping warm for 1-3 hours to obtain a mixed filler; immersing the mixed filler in the mixed bacterial solution, oscillating and culturing, filtering, and drying to obtain a novel magnetic pyrite filler; the obtained novel magnetic pyrite filler has both excellent mechanical stability and efficient nitrogen and phosphorus removal efficiency, and achieves efficient removal of nitrogen and phosphorus pollutants in wastewater through the synergistic effect of physical adsorption and biodegradation.

The invention relates to the technical field of industrial solid waste resource utilization, in particular to a method for preparing ferrous phosphate octahydrate by taking pyrite cinder as a raw material, which comprises the following steps: 1) taking pyrite cinder as a raw material, and carrying out ball milling to obtain fine powder; 2) rinsing the fine powder with dilute acid and water respectively to obtain red slag; 3) mixing the red slag with a reducing agent, and calcining to obtain reducing slag; (4) under the protection of inert gas, leaching the reducing slag with sulfuric acid, filtering to obtain a leaching solution, and adjusting the iron ion concentration and the iron-phosphorus ratio to obtain an iron-phosphorus solution; (5) under the protection of inert gas, dilute alkali is added into the iron-phosphorus solution to adjust the pH value, filtering is performed after full reaction, and an iron-phosphorus purified solution is obtained; (6) under the protection of inert gas, dilute alkali is added into the iron-phosphorus purified liquid to adjust the pH value, filtering is performed after full reaction, and a filter cake is obtained; and 7) washing the filter cake, and carrying out vacuum drying to obtain ferrous phosphate octahydrate. The problems of environmental pollution and serious resource waste caused by difficult recycling of pyrite cinder can be solved.

The invention discloses a preparation method of a standardized sheet for a thermoelectric test of minerals or mineral materials and alloys, belongs to the technical field of mineralogy, material science and prospecting prediction, and establishes a preparation process of a universal mineral or mineral material and alloy thermoelectric sheet. Covering all semiconductor mineral types or mineral material types such as pyrite, magnetite, graphite and sintered ore; accurate thickness control is achieved through a double-face polishing-loading sheet supporting structure, in-situ testing of the thermoelectricity of minerals or mineral materials and alloys is achieved, and the testing precision is improved; by adopting a conductive adhesive-copper plate composite structure, the interface resistance is reduced, the supporting strength is met, and the requirement of eliminating detection interference is met; residual colloid is thoroughly removed through ultrasonic cleaning, and the insulation effect is avoided; according to the standardized sheet, the hollow aminated phenolic resin nanosphere is used as a conductive substrate and is used for bonding a sample and a copper plate, the contact resistance between the sample and an electrode can be greatly reduced, and the accuracy of test data is improved.

A system for dynamic oxidation of a heap of copper ore includes a “process island” for formulating and dispensing oxidizing reactive mixtures having predetermined compositions, and irrigating the heap with the mixtures to progressively transform the ore and maintain conditions for enhanced recovery of metal by heap leaching, solvent-extraction and electrowinning. In embodiments, the system is adapted to obtain copper metal from the refractory copper mineral chalcopyrite.

The invention relates to an inhibitor for efficiently separating copper and sulfur under a low-alkalinity condition, a flotation reagent and a flotation method. The inhibitor is a compound as shown in a formula I (formula I), wherein R1, R2, R3 and R4 are respectively and independently selected from one of-R5X,-X,-H and-N + R6, R5 is alkyl of C1-C10, naphthenic base of C3-C10 or heterocyclic group of C3-C10, and the ring of the heterocyclic group is provided with or not provided with a substituent group; x is one of F, Cl, Br, I, tertiary amine positive ions, nitro, cyano, sulfo, formyl, acyl and carboxyl; r6 is a C1-C5 alkyl group or a C3-C5 cycloalkyl group; the inhibitor is low in viscosity and good in fluidity, pyrite and chalcopyrite in complex copper sulfide ore copper-sulfur ore can be effectively separated under the low-alkalinity condition, and the separation effect is remarkable.

The present invention discloses a method for desulfurizing phosphogypsum with low carbon emissions and preparing magnesium-modified low-carbon clinker. Phosphogypsum is proportioned with medium and low-grade pyrite, aggregate waste residue, and silico-aluminous raw materials according to the designed molar ratios of S:S and effective CaO:SiO2, mixed and ground, made into balls with water, and then dried. The dried balls are calcined in a rotary kiln lacking oxygen or oxygen-free after coal combustion, and cooled after calcination to obtain magnesium-modified low-carbon clinker. The present invention uses medium and low-grade pyrite to completely replace carbonaceous raw materials as a reducing agent to treat phosphogypsum, further reducing the coal consumption cost and carbon emissions when treating a large amount of phosphogypsum, and synergistically using aggregate waste residue to regulate the atmosphere, increase the magnesium content, and reduce the iron content. Through reasonable proportioning and processes, efficient and stable desulfurization of phosphogypsum is achieved, and magnesium-modified low-carbon clinker with high carbonation strength is simultaneously prepared, and the preparation method is more suitable for industrial promotion and application.

The invention discloses a preparation method of FePS3, which comprises the following steps: mechanically mixing pyrite powder, sulfur-containing small molecules and elemental phosphorus, calcining the fully mixed powder in two temperature stages under a protective atmosphere, and cooling to obtain FePS3 nano-powder; wherein in the first temperature stage, the temperature is 200-300 DEG C, and the heat preservation time is 120-240 minutes, and in the second temperature stage, the temperature is 400-600 DEG C, and the heat preservation time is 120-180 minutes; the sulfur-containing small molecules are thiourea, thioacetamide or a mixture of the thiourea and the thioacetamide; the molar ratio of sulfur atoms to phosphorus atoms in FeS2 molecules and sulfur-containing small molecules in the pyrite powder is (1: 3: 5)-(1: 1: 5). According to the method, pyrite is used as an iron source and a sulfur source, sulfur-containing small molecules are used as a second sulfur source, and the FePS3 nano-powder is directly obtained through solid-phase reaction with the simple substance phosphorus without additional purification treatment. The method is low in solid-phase reaction temperature and simple in process, does not need harsh reaction conditions, and is easy for large-scale production.

The application discloses a gold leaching method for pyrite-containing gold ore, and comprises the following steps: after the pyrite-containing gold ore is finely ground, water is added to obtain a slurry; a gold leaching reagent solution is added into the slurry to obtain a mixed leaching solution; the pH value of the mixed leaching solution is adjusted to alkaline, and leaching treatment is performed; and after filtration, a gold-containing leaching solution is obtained; the gold leaching reagent solution comprises polyphosphate, copper salt and thiosulfate; in the gold leaching reagent, polyphosphate is added; under alkaline conditions, polyphosphate ions can be selectively adsorbed or complexed on the surface active sites of pyrite to form a physical or chemical masking layer, thereby effectively blocking the direct contact of pyrite with dissolved oxygen and thiosulfate in the solution, inhibiting the catalytic decomposition of pyrite, significantly reducing the invalid consumption of thiosulfate, stabilizing the pH value and potential of the leaching system, and guaranteeing the efficient leaching of gold.