39 results about "Phosphorus pentasulfide" patented technology

The invention discloses a preparation method of a high-performance lithium-phosphorus-sulfur-chlorine solid electrolyte, and relates to the technical field of solid-state lithium batteries. The method comprises the following steps: in an inert atmosphere environment, selecting lithium sulfide, phosphorus pentasulfide, sulfur and lithium chloride as raw materials, carrying out mechanical alloying treatment through a high-energy ball milling method, then promoting crystallization through heat treatment, and finally optimizing the particle size distribution of the material through powder grading. The method provided by the invention can effectively improve the ionic conductivity of lithium phosphorus sulfur chlorine, and the solid electrolyte with good fluidity and stability is obtained.

The invention provides a preparation method of sulfide electrolyte and a solid-state battery. The method comprises the following steps: uniformly mixing lithium sulfide and lithium chloride, and pre-sintering the uniformly mixed substance at the temperature of 600-1000 DEG C to obtain a composite precursor; and uniformly mixing the composite precursor with phosphorus pentasulfide, and sintering the uniformly mixed substance to obtain the sulfide electrolyte. The method is used for achieving the effect of improving the ionic conductivity of the sulfide electrolyte.

The invention provides a sulfide electrolyte material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing lithium sulfide, phosphorus pentasulfide, rare earth sulfide and a solvent, and reacting to obtain a sulfide electrolyte precursor; and carrying out pressing treatment on the sulfide electrolyte precursor, and carrying out low-temperature sintering on the material obtained by pressing at 250-500 DEG C to obtain the sulfide electrolyte material. According to the method disclosed by the invention, the synthesis of the rare earth element doped sulfide precursor is realized by adopting a pure liquid phase method, particles are dispersed in a liquid phase solvent, and the particle uniformity and dispersity of the obtained finished product are obviously superior to those of a solid phase method. After the precursor obtained by the liquid phase method is pressed and sintered at low temperature, the crystal boundary between crystals of the electrolyte material is relatively small, the energy barrier of ion transmission is remarkably enhanced, the conductivity of the electrolyte is optimized, and the long-cycle stability of the all-solid-state battery is improved.

The invention discloses a synthesis method of lithium phosphorus sulfur chloride, and relates to the technical field of preparation of sulfide solid electrolyte for all-solid-state lithium ion batteries, and the scheme is as follows: the synthesis method of lithium phosphorus sulfur chloride comprises the following steps: pretreatment of raw materials: mixing lithium carbonate (Li2CO3), phosphorus pentasulfide (P2S5), lithium chloride (LiCl) and elemental sulfur (S) according to a preset ratio, and then adding a catalyst, grinding and dispersing for a preset time to obtain uniformly dispersed mixed powder; reduction reaction: fully mixing the mixed powder with a reducing agent, heating to a first preset temperature condition, and carrying out reduction reaction to obtain a reduction product; sintering and purifying: heating the reduction product to a second preset temperature, and sintering to form a lithium phosphorus sulfur chloride (Li6PS5Cl) crystal phase to obtain a lithium phosphorus sulfur chloride (Li6PS5Cl) product; the raw material cost can be remarkably reduced, the process safety and economy are optimized, and large-scale industrial preparation of lithium phosphorus sulfur chlorine is realized.

This invention relates to a method for preparing high-purity phosphorus pentasulfide using a low-temperature liquid phase and its application, belonging to the technical field of key materials for lithium-sulfur batteries and solid-state batteries. It solves the technical problems of high reaction temperature and high energy consumption in existing phosphorus pentasulfide preparation processes. The method includes the following steps: Step 1: Select phosphorus pentachloride, dry it, and place the treated phosphorus pentachloride in an organic solvent to form a suspension or slurry system; Step 2: Place the suspension or slurry system in a closed reactor; Step 3: Introduce a sulfur source into the reactor to allow phosphorus pentachloride to undergo a sulfidation reaction with the sulfur source; Step 4: Raise the temperature to a set point and maintain a deep sulfidation reaction to generate phosphorus pentasulfide; Step 5: After the reaction, cool, separate the solid and liquid phases, and dry to obtain the solid product of phosphorus pentasulfide. This invention features mild reaction conditions, a simplified process flow, high safety, and recyclable solvents, making it suitable for continuous and large-scale production.

A method of making a solid-state electrode sheet is provided. The method includes mixing precursors capable of chemically reacting to form a target solid-state electrolyte (SSE) together with one or more of a binder, an electrode active material, and a conductive carbon in a solvent to form a coating slurry. The precursors a undergoes a chemical reaction in the solvent to form the target SSE. The coating slurry is applied onto a current collector. The solvent is evaporated from the coating slurry on the current collector, thereby producing a solid-state electrode sheet having a target SSE. The precursors may be lithium sulfide (Li2S) and phosphorus pentasulfide (P2S5) reacting in a tetrahydrofuran (THF) solvent to produce a sulfide-base SSE such as Li3PS4.

This invention discloses a method for preparing a high water-resistant zinc dialkyl dithiophosphate additive. Specifically, the method involves: first, weighing an alkyl alcohol; then, under stirring conditions, adding phosphorus pentasulfide in batches to the alkyl alcohol; after the addition is complete, heating the reaction, followed by vacuum distillation, cooling, and filtration to obtain dialkyl dithiophosphate; second, stirring an aromatic solvent with zinc oxide to form a homogeneous phase; adding a fatty acid salt promoter and the intermediate dialkyl dithiophosphate; stirring; then adding zinc oxide in batches; after the addition is complete, heating and vacuum reactions are performed, followed by cooling; adding sulfides; and then heating, vacuum distillation, and filtration to obtain the high water-resistant zinc dialkyl dithiophosphate additive. This high water-resistant zinc dialkyl dithiophosphate additive can be used to formulate high-performance oil film bearing oils, giving the oil excellent water separation properties, anti-wear properties, and excellent filterability, hydrolytic stability, and outstanding load-bearing capacity.

The present invention relates to a kind of synthesis process of thiabendazole, including:Using lactic acid and o-phenylenediamine as raw materials, solid acid is used as catalyst condensation reaction in water to obtain 2 α hydroxyethyl benzimidazole;2 α hydroxyethyl benzimidazole, micron-grade magnetic iron powder are mixed and put into water, hydrogen peroxide is added for catalytic oxidation, and 2 acetyl benzimidazole is obtained;2 acetyl benzimidazole is put into glacial acetic acid, bromine is added, and the MOF powder of trivalent Fe as central metal is catalyst, bromine substitution reaction is carried out, and 2 dibromoacetyl benzimidazole hydrobromide is obtained;Formamide and phosphorus pentasulfide are put into ethyl acetate, 30 45 DEG C of reaction 1 2h, 2 dibromoacetyl benzimidazole hydrobromide is added, ammonia catalytic cyclization reaction is passed through, and reaction is filtered after terminating, and filtrate cools down and precipitates solid, separates solid, washes, and obtains thiabendazole. The present invention can obtain higher yield than prior art, and reaction conditions are mild, catalyst and solvent are easily separated and recycled, reduces waste of raw materials, and reduces resource recovery difficulty.

The invention belongs to the technical field of wet-process phosphoric acid purification, and provides a method for efficiently removing arsenic from wet-process phosphoric acid. According to the method, wet-process phosphoric acid is mixed with an arsenic removal agent A and an arsenic removal agent B for reaction, and efficient arsenic removal of wet-process phosphoric acid is completed; the arsenic removal agent A comprises one or more of phosphorus pentasulfide, hydrogen sulfide and sodium sulfide; and the arsenic removal agent B comprises one or more of a sulfate salt anionic surfactant, a sulfonate anionic surfactant and a carboxylate anionic surfactant. The method is simple, environment-friendly and low in production and operation cost, the sulfide and the anionic surfactant are used as the composite arsenic removal agent, the arsenic removal efficiency is improved, the use amount of the arsenic removal agent is greatly reduced, the advantage of arsenic removal of the sulfide is reserved, the defect of rapid decomposition of the sulfide is overcome, escape of H2S is reduced, and the method is suitable for industrial production. The safety is higher, and the application prospect is very wide.

The present invention relates to the field of thiabendazole preparation, specifically an improved thiabendazole preparation method. Comprise the following steps: S1 methylglyoxal is added to a container, the temperature is raised to 30-35 DEG C to melt, a catalyst is added, stirred evenly, air is blown in, and then o-phenylenediamine and acetic acid are added in batches, and the temperature is raised to 50-60 DEG C after adding, and the reaction is carried out for 2-5h to obtain a reaction solution containing 2-acetylbenzimidazole; S2 The reaction solution obtained in step S1 is added with liquid bromine, reacted, and after the reaction is completed, cooled, filtered, washed, and dried to obtain 2-dibromoacetylbenzimidazole hydrobromide; S3 The 2-dibromoacetylbenzimidazole hydrobromide obtained in step S2 is added to ethyl acetate, and then formamide and phosphorus pentasulfide are added for ring-closure reaction to obtain a closed-loop reaction liquid; S4 The thiabendazole in the closed-loop reaction liquid obtained in step 3 is purified to obtain a thiabendazole product. The process is simple, the prepared product has high purity, and the purity is 99.3%, and it is expected to be industrialized as soon as possible.

The phosphorus pentasulfide discharger comprises a shell, the shell sequentially comprises a feeding bin, a transfer bin and a discharging bin from top to bottom, one side face of the transfer bin is closed, and the other side face of the transfer bin is covered with a cover plate; the impeller is installed in the transfer bin through a rotating shaft, and one end of the rotating shaft penetrates through the closed side face of the transfer bin and is connected with the motor; and the multiple gas inlet bins penetrate through the side faces of the discharging bin correspondingly, and the gas inlet bins are connected with the nitrogen pipeline through pipelines and valves. According to the discharger, the multiple gas inlet bins connected with the nitrogen pipeline are arranged, and nitrogen in the nitrogen pipeline is introduced into the discharging bin, so that the oxygen content and the moisture content in the gas inlet bins are reduced, and the situation that phosphorus pentasulfide is hydrolyzed in the discharging process, is subjected to friction and then burns and breaks out of fire can be prevented.

The invention belongs to the technical field of solid electrolyte, and provides a method for regenerating sulfide solid electrolyte, which is characterized by comprising the following steps: (S1) mixing Li2S (lithium sulfide), P2S5 (phosphorus pentasulfide) and sulfide solid electrolyte waste powder to obtain regenerated powder; (S2) carrying out heat treatment on the regenerated powder to obtain a sintered body; and (S3) molding the sintered body to obtain the regenerated sulfide solid electrolyte, because the regenerated sulfide solid electrolyte does not contain LiCl, it can be ensured that the regenerated sulfide solid electrolyte has high ionic conductivity, and the prepared battery has excellent electrochemical performance.

The invention provides a preparation method of an LMPSC sulfide solid electrolyte, which comprises the following steps: adding an additive into a main raw material, calcining and doping metal elements to obtain the LMPSC sulfide solid electrolyte, wherein the main raw materials comprise phosphorus pentasulfide, lithium sulfide and lithium chloride; the additive is metal chloride. The invention further provides the obtained LMPSC sulfide solid electrolyte and application of the LMPSC sulfide solid electrolyte in a power automobile. According to the preparation method, by introducing metal elements, the LMPSC sulfide solid electrolyte capable of providing capacity and transmitting Li < + > can be obtained.

This invention discloses a dithiophosphoryl-substituted azine compound and its synthetic method, belonging to the field of organic synthesis technology. The synthetic method uses azine compounds, phosphorus pentasulfide, and alcohols as substrates. In a membrane-free electrolytic cell, using tetrabutylammonium bisulfate as the electrolyte and acetonitrile as the solvent, a three-component dehydrogenation coupling reaction is achieved by constant current electrolysis at room temperature. No metal catalyst or external chemical oxidant is required. Inexpensive phosphorus pentasulfide serves as both the sulfur and phosphorus source. By controlling the electrolysis time, mono- or bis-dithiophosphoryl-substituted azine compounds can be selectively prepared with moderate to excellent product yields. Mechanistic studies show that the reaction proceeds via a free radical-mediated pathway. This method is mild, simple to operate, and has a wide range of applicable substrates, meeting the requirements of green chemistry and providing a new route for the efficient synthesis of functionalized phenoxazine derivatives.

The invention provides a preparation method of an LPSC sulfide solid electrolyte, which comprises the following steps: (1) adding an additive into a main raw material, and calcining for Si doping to obtain a first sintered material; wherein the main raw material is a first raw material and comprises phosphorus pentasulfide, lithium sulfide and lithium chloride; the additive is a first additive and is a Si-containing compound; (2) repeating the step (1) by taking a second raw material as a main raw material and taking a second additive as an additive to perform CaF2 coating to obtain a secondary sintered material, namely an LPSC sulfide solid electrolyte; wherein the second raw material is a sintered material; and the second additive is CaF2. The invention further provides the obtained LPSC sulfide solid electrolyte and application of the LPSC sulfide solid electrolyte in a power automobile. According to the preparation method, the high-chlorine LPSC sulfide solid electrolyte is subjected to secondary sintering and CaF2 coating treatment, and the prepared LPSC sulfide solid electrolyte has the dual effects of high magnification and low side reaction.

This invention relates to the field of solid-state lithium battery technology, and in particular to a method for preparing a sulfide solid electrolyte. The method includes the following steps: under an inert atmosphere, lithium sulfide, sulfur, red phosphorus, and lithium chloride are mixed; the mixed raw materials are ball-milled to obtain a precursor; and the precursor is then sintered, cooled, and ground to obtain the sulfide solid electrolyte. The sulfide solid electrolyte preparation method provided by this invention allows the in-situ generated P2S5 to bind more tightly with surrounding substances during the formation of lithium phosphorus, sulfur, and chloride, thus improving product purity. Using sulfur and red phosphorus instead of phosphorus pentasulfide provides readily available and cost-effective raw materials, avoids the toxicity of phosphorus pentasulfide, and further avoids the risk of severe exothermic reactions caused by localized overheating when directly using P2S5.

The utility model provides a cyclone dust removal device suitable for phosphorus pentasulfide feeding, which comprises a cyclone dust removal device body, and a main pipeline is arranged at the end part of an exhaust pipe of the cyclone dust removal device body and is used for guiding clean airflow to be discharged to form negative pressure in the cyclone dust removal device body. Inert gas is introduced into the cyclone dust collector body through the main pipeline when materials are discharged, a three-way reversing valve is arranged at one end of the main pipeline, a breather pipe is connected to one connector of the three-way reversing valve and used for introducing the inert gas into the main pipeline, one end of the breather pipe is connected with a gas outlet of an inert gas storage tank, and the other end of the breather pipe is connected with a gas outlet of the inert gas storage tank. According to the utility model, the main pipeline is matched with the adjustment of the electric three-way ball valve, so that positive pressure is formed in the cyclone dust collector body, phosphorus pentasulfide dust can be conveniently discharged and recycled, reentrainment of dust is inhibited, phosphorus pentasulfide is prevented from being hydrolyzed with moisture in the air, the safe operation of equipment is guaranteed, and the risk of environmental pollution is reduced.

The utility model discloses an industrial phosphorus pentasulfide vacuum suction system, which relates to the technical field of vacuum suction, comprises a reaction tank, a vacuum pump system, a gas-solid separation tank, a storage tank and a tail gas treatment device, and is characterized in that the reaction tank is connected with the gas-solid separation tank through a pipeline and the vacuum pump system; the pipeline is made of a high-corrosion-resistance PTFE (Polytetrafluoroethylene) pipeline, the vacuum pump system comprises a PTFE coating rotary vane pump and a standby dry centrifugal pump, the gas-solid separation tank is connected with the storage tank and the tail gas treatment system through the pipeline, the tail gas treatment system at least comprises a chemical adsorption tower and a tail gas combustion device, and the chemical adsorption tower and the tail gas combustion device are respectively connected with the storage tank and the tail gas combustion device. 3, for the solution treated by the chemical adsorption tower, if residual phosphorus pentasulfide or other pollutants exist, the solution can be further treated through a tail gas combustion device. The device can burn residual substances at high temperature and convert the residual substances into harmless carbon dioxide and water, so that environmental pollution is effectively reduced. Through the combined application of the chemical adsorption tower and the tail gas combustion device, the industrial phosphorus pentasulfide vacuum suction system not only meets the requirements of environmental regulations, but also can remarkably reduce the treatment cost and the resource consumption.

The application relates to a method for preparing high-purity phosphorus pentasulfide in a low-temperature liquid phase and application thereof, and belongs to the technical field of key materials for lithium-sulfur batteries and solid-state batteries. The method solves the technical problems of high reaction temperature and large energy consumption in the existing preparation process of phosphorus pentasulfide. The method comprises the following steps: step 1, selecting phosphorus pentachloride, drying the phosphorus pentachloride, and placing the treated phosphorus pentachloride in an organic solvent to form a suspension phase or a slurry system; step 2, placing the suspension phase or the slurry system in a closed reactor; step 3, introducing a sulfur source into the reactor to make the phosphorus pentachloride and the sulfur source undergo a sulfuration reaction; step 4, keeping the deep sulfuration reaction after being heated to a set temperature to generate phosphorus pentasulfide; and step 5, cooling, solid-liquid separation and drying after the reaction to obtain a phosphorus pentasulfide solid product. The application has the advantages of mild reaction conditions, simplified process flow, high safety, recyclable solvent and suitability for continuous and large-scale production.

This invention proposes a fully sulfurized DOPO flame retardant, its preparation method, and its application. The preparation method of the fully sulfurized DOPO flame retardant includes the following steps: reacting 2-mercapto[1,1'-biphenyl], trifluoromethanesulfonic acid, and phosphorus trichloride to introduce a cyclic Cl-P-S bond, then reacting with water to replace Cl with O, yielding a semi-sulfurized DOPO flame retardant; reacting the semi-sulfurized DOPO flame retardant, anhydrous toluene, and phosphorus pentasulfide to replace O with S, yielding a fully sulfurized DOPO flame retardant. This invention replaces the oxygen element that supports combustion in DOPO with sulfur, which has flame-retardant properties, thus synthesizing a fully sulfurized DOPO flame retardant with better flame-retardant effects.

The invention relates to the technical field of all-solid-state lithium battery materials, and discloses a manufacturing method and application of a high-performance sulfide solid electrolyte which comprises the following components in parts by mole: 2.50-2.90 parts of lithium sulfide, 0.10-0.40 part of phosphorus pentasulfide, 0.20-0.80 part of germanium disulfide and 0.80-1.20 parts of lithium chloride. The manufacturing method comprises the following steps: carrying out ball milling on raw materials in an inert atmosphere to obtain amorphous precursor powder; sealing the amorphous precursor powder in a carbon coating quartz tube for vacuum constant-temperature heat treatment; and controlling the heating device to slowly reduce the temperature to below 200 DEG C after the heat treatment is finished. According to the invention, a lithium ion transmission channel is expanded through multi-element co-doping, and the crystallinity is improved and the grain boundary impedance is reduced in cooperation with a controlled slow cooling process. The obtained high-performance sulfide solid electrolyte has high ionic conductivity and excellent electrochemical stability, and is suitable for preparing an all-solid-state battery with a wide voltage window.

The invention provides a solid sulfide electrolyte and a preparation method thereof. The preparation method of the solid sulfide electrolyte comprises the following steps: S1, mixing phosphorus pentasulfide, lithium sulfide, lithium chloride and a first solvent, and carrying out ball milling to obtain a precursor; s2, performing heat treatment on the precursor to obtain precursor powder; s3, performing tabletting treatment on the precursor powder to obtain a flaky precursor; s4, sintering the flaky precursor in an inert protective atmosphere to obtain a sintered product; s5, mixing the sintered product with a second solvent, and performing graded liquid-phase grinding to obtain a graded grinding final product; and step S6, carrying out heat treatment on the graded grinding final product to obtain the solid sulfide electrolyte. According to the preparation method of the solid-state sulfide electrolyte, the particle consistency of the solid-state sulfide electrolyte product can be improved through the synergistic effect of tabletting treatment and graded liquid-phase grinding.

The safe and environment-friendly storage and transportation device comprises a storage box, the upper portion of the storage box is provided with an air inlet and a feeding port, the bottom of the storage box is provided with a discharging port, the air inlet is provided with a quick connector, and one end of the quick connector is connected with a breather pipe. The nitrogen inlet is arranged in the storage box and used for introducing inert gas into the storage box to form inert gas protection in the storage box, a rotary valve is arranged at the feed port, a connecting pipe is arranged at the feed end of the rotary valve, a sealing cover is arranged at the upper end of the connecting pipe, and an exhaust valve is arranged at the upper part of the storage box. A dynamic inert gas protection layer is formed to isolate outside moisture and oxygen, the hydrolysis reaction of phosphorus pentasulfide is remarkably inhibited, corrosive phosphoric acid and highly toxic hydrogen sulfide gas are prevented from being generated, the caused explosion risk is avoided, and transportation safety and stable chemical properties of materials are guaranteed.

This invention provides a flotation collector for high-sulfur complex lead-zinc polymetallic ores, its preparation method, and its application. The collector is N,N'-dibromophenyl dithioaminophosphate, prepared by reacting o-bromoaniline with phosphorus pentasulfide in toluene. This collector exhibits strong collecting ability, good selectivity, non-sticky flotation froth, low middlings recycling volume, and strong adaptability for lead sulfide minerals. It is convenient to use, requires a small dosage, and simplifies the flotation process, reducing flotation costs and environmental impact, thus achieving better flotation separation of high-sulfur lead-zinc ores. Furthermore, this collector can also recover various associated gold and silver minerals in high-sulfur complex lead-zinc polymetallic ores, demonstrating broad applicability and strong adaptability, especially for fine-grained associated gold and silver minerals with a particle size less than 37 μm, exhibiting strong collecting ability and good selectivity.

The present invention discloses a method for preparing alprazolam and its impurity LAP. The method uses 7-chloro-5-phenylbenzodiazepine as a starting material, undergoes an acylation reaction with acetyl chloride, and then undergoes a cyclization reaction with hydrazine hydrate to obtain an alprazolam finished product. The method can avoid the production of impurity LAP, while avoiding the use of phosphorus pentasulfide and the risk of poisoning caused by the generation of hydrogen sulfide during the reaction, thereby greatly improving the safety of the process. The present invention uses 7-chloro-5-phenylbenzodiazepine as a starting material, reacts with chloroacetic acid, and then undergoes a cyclization reaction with hydrazine hydrate under the catalysis of a condensing agent N,N'-carbonylbis(1,2,4-triazole) to obtain the impurity LAP. The method can be widely used in the quality research of alprazolam raw materials and their preparations, thereby improving the safety, effectiveness and quality controllability of the drug. #imgabs0#

The invention relates to a wet-process phosphoric acid deep cadmium removal method based on dialkyl dithiophosphate, which comprises the following steps: (1) taking mixed alcohol of one or more than one straight-chain or branched-chain alcohol as a raw material, reacting with phosphorus pentasulfide, filtering to obtain thiophosphoric acid filtrate, and reacting the thiophosphoric acid filtrate with metal oxide to synthesize dialkyl dithiophosphate (DDP); (2) roughly dividing the conventional wet-process phosphoric acid process into phosphorite pretreatment, phosphorite decomposition, dilute acid sedimentation, dilute acid concentration and concentrated acid sedimentation; and mixing the DDP with the cadmium-containing wet-process phosphoric acid slurry, dilute phosphoric acid or concentrated phosphoric acid for reaction to generate hydrophobic cadmium complex precipitate, and filtering after the reaction is finished to obtain purified phosphoric acid, thereby realizing removal of cadmium. According to the method, no HS gas is generated, and occupational hazards are avoided; raw material cost is low; the cadmium removal rate is gt; the phosphorus loss is as low as 0.5%; the method is suitable for wet-process phosphoric acid slurry, dilute phosphoric acid and concentrated phosphoric acid and can be directly integrated to an existing production line, the cadmium content of the cadmium-containing phosphoric acid after cadmium removal is smaller than or equal to 2 ppm, and the phosphorus loss rate is smaller than or equal to 3%.

This invention belongs to the technical field of solid electrolytes and discloses a method for preparing a liquid-phase doped silver-germanium sulfide solid electrolyte with high ionic conductivity. The method includes: 1) dispersing lithium sulfide and phosphorus pentasulfide in an organic solvent, heating and stirring to obtain a precursor solution containing Li3PS4; 2) mixing lithium iodide, sulfur powder, and additives with the precursor solution, heating and stirring to remove the organic solvent, and obtaining a powder; 3) sintering the powder under a protective atmosphere to obtain a silver-germanium sulfide solid electrolyte; the additives are one or more of SiS2, GeS2, SnS2, As2S3, and Sb2S3. This invention is simple, and the prepared silver-germanium sulfide electrolyte undergoes elemental doping during thermal crystallization, improving the electrolyte's ionic conductivity and air stability. This method is suitable for industrial production.

The invention relates to a cadmium removal aid and a preparation method and application thereof, the cadmium removal aid is partially saponified dialkyl dithiophosphate, and is prepared by reacting mixed alcohol with phosphorus pentasulfide to generate thiophosphoric acid and then partially saponifying the thiophosphoric acid with metal oxide, wherein the content of free acid in the partially saponified dialkyl dithiophosphate is 0.01%-99.99% of the total molar percentage of substances, the cadmium removal auxiliary agent prepared by the method is used for removing cadmium in wet-process phosphoric acid slurry, the use amount of the cadmium removal auxiliary agent is 0.1%-1% of the mass of the slurry, stirring is performed for 10-120 minutes under the conditions of 60-80 DEG C and 80-300 r / min, then filtering is performed, cadmium removal is realized, and purified dilute phosphoric acid is obtained. The method is applied to cadmium removal in wet-process phosphoric acid production, is simple in process and low in cost, does not generate toxic gas, and meets the requirements of industrial production.

The utility model discloses a phosphorus pentasulfide feeding device, belongs to the field of refined sulfuric acid, and particularly discloses the phosphorus pentasulfide feeding device which is characterized in that a first hopper, a second hopper, a third hopper, a first gate valve and a second gate valve are arranged, heated nitrogen is introduced into the first hopper, in the phosphorus pentasulfide feeding process, the nitrogen is introduced into the second hopper, and the nitrogen is introduced into the second hopper; and after the humidity and oxygen concentration in the first hopper, the second hopper and the third hopper meet the requirements, the materials are sequentially fed, so that in the whole process of feeding phosphorus pentasulfide, the phosphorus pentasulfide does not react with water vapor to generate toxic hydrogen sulfide, and the safety of the phosphorus pentasulfide feeding process is improved.

The invention relates to a preparation method of a lithium-containing sulfide, lithium thiophosphate and a sulfide solid electrolyte. The preparation method comprises the following steps: providing a first raw material containing liquid phosphorus pentasulfide and / or liquid sulfur and a second raw material containing a lithium element; wherein the second raw material containing the lithium element comprises lithium sulfide powder or liquid lithium; in an inert gas atmosphere, the first raw material and the second raw material are contacted and react in a reactor; the reaction temperature ranges from 280 DEG C to 500 DEG C. According to the method, the liquid phosphorus pentasulfide and the second raw material containing the lithium element are contacted and react at a relatively low temperature, so that the problem of low purity possibly caused by a grinding process is avoided, the lithium-containing sulfide with high purity and controllable particle size can be obtained through rapid, continuous and large-scale production, and the production cost is reduced.