126results about "Silicon halogen compounds" patented technology

This invention discloses a process for purifying and concentrating dilute fluorosilicic acid solution using chemical extraction. The main steps are as follows: 1. Extraction: Dilute fluorosilicic acid and extractant are mixed in a certain ratio for chemical extraction. After extraction, the aqueous phase and the organic phase are separated. 2. Back-extraction: The organic phase and back-extraction solution are mixed in a certain ratio. Under certain operating conditions, fluorosilicic acid is back-extracted from the organic phase to obtain a concentrated fluorosilicic acid solution and raffinate. 3. Raffinate treatment: A saturated solution of soluble heavy metal salt is added to the raffinate in a certain ratio, and a chemical reaction is carried out under certain operating conditions. After the reaction is completed, centrifugation is performed to obtain heavy metal sulfate, which is recovered as a byproduct. The organic phase is then subjected to vacuum distillation to separate the extraction aid. The remaining organic matter is further decomposed by vacuum heating to obtain an organic extractant and inorganic acid vapor. The organic extractant is reused, and the inorganic acid vapor is condensed and recovered. This invention has good purification effect, simple process, and the extractant can be recycled.

The invention belongs to the field of coal gangue resource utilization, and particularly discloses a method for separating and recovering silicon and aluminum elements from coal gangue. The coal gangue is used as a raw material, and efficient resource utilization of the coal gangue is realized through crushing and ball milling, high-temperature roasting activation and acid-base combined treatment. The coal gangue is subjected to high-temperature fluorination roasting by adopting an activating auxiliary agent fluorinating agent to form soluble fluosilicate (H2SiF6) and a fluorine-aluminum compound (AlF3), so that the subsequent silicon-aluminum separation is obviously promoted. The method comprises the following steps: desiliconizing through alkali treatment, leaching and converting silicon in the coal gangue into sodium silicate, and carrying out solid-liquid separation to obtain sodium silicate filtrate and aluminum-rich leaching residues; and then acid treatment is conducted on the aluminum-rich leaching residues, aluminum salt or aluminum hydroxide is prepared, and finally efficient separation of silicon and aluminum is achieved. According to the method, through high-temperature activation roasting, the normal-pressure alkaline leaching desiliconization effect is improved, the acid extraction aluminum efficiency is remarkably improved, the advantages of an acid method and an alkaline method are effectively combined, and the problems that coal gangue resources are difficult to utilize and the resource recovery rate is low are solved.

The invention belongs to the technical field of industrial wastewater treatment and resource recovery, and particularly relates to an enhanced treatment method for recovering fluorine resources in semiconductor processing fluorine-containing wastewater. And step-by-step efficient recovery of sodium fluosilicate and calcium fluoride is realized through cooperation of precipitant compounding and pH regulation. The method comprises the following steps: firstly, adding a NaCl-NaHCO3 composite precipitator and sodium fluosilicate seed crystals to induce crystallization and recover hexagonal prism-shaped sodium fluosilicate single crystals; and after filtering, adding a CaCl2-Ca (OH) 2 composite precipitator and calcium fluoride seed crystals into the filtrate to generate large-particle calcium fluoride. And the impurity content in the recovered product respectively reaches the industrial sodium fluosilicate superior product standard and the metallurgical grade calcium fluoride secondary product standard. And the treated wastewater is neutral or weakly alkaline, so that the subsequent mixed treatment with other wastewater is facilitated.

A sulfide-based solid electrolyte has an argyrodite-type crystal structure which is doped with an element having an oxidation number of 4 and a transition metal having an oxidation number of 6 so as to improve moisture stability and ionic conductivity of the sulfide-based solid electrolyte.

The invention discloses integrated equipment for preparing sodium fluosilicate through photovoltaic wastewater resource utilization, and particularly relates to the field of photovoltaic wastewater, the integrated equipment comprises a filtering unit, a chemical adding unit, a reaction unit, a centrifugal unit and an online detection system, the filtering unit comprises a raw water tank and a precision filter, the raw water tank is connected with the precision filter through a pipeline, and the chemical adding unit is connected with the reaction unit through a pipeline; an online hydrofluoric acid concentration detector is arranged at the water outlet end of the precision filter; the online detection system comprises a fluorine ion detector, a pH meter module and a PLC (Programmable Logic Controller) control unit, and the PLC control unit is used for quantitatively conveying filtered wastewater to a reaction tank in the reaction unit through a water pump according to the detected hydrofluoric acid concentration. According to the equipment, efficient resource utilization of photovoltaic wastewater is realized through precise filtration, dosing and reaction control, and a sodium fluosilicate product is generated.

The invention discloses a production method of hexachlorotrisiloxane. Production devices mainly comprise a reaction synthesizer, a condensation system, a rectification system, a final-stage condensation system and a storage system. The method comprises the following steps: reacting raw materials silicon tetrachloride and primary alcohol according to a certain ratio under the catalytic action of a boron Lewis acid catalyst in an environment that the reaction temperature is controlled to be 650-800 DEG C and the reaction pressure is controlled to be 0.6-0.8 MPa to obtain a mixed gas of hexachlorotrisiloxane and a by-product; and the high-purity hexachlorotrisiloxane is obtained after cooling of the condensation system and separation of the rectification system. The invention breaks through the blank of the production process of the hexachlorotrisiloxane in China, thereby eliminating the dependence of the demand of the hexachlorotrisiloxane product in China on foreign import, providing a stable production process, expanding the productivity of the hexachlorotrisiloxane, and realizing the production of the high-purity hexachlorotrisiloxane product. The problems of high-end industries in China are solved, and sustainable development of related industries in China is promoted.

Disclosed herein are methods for preparing fluorided solid oxides by contacting an acidic fluorine-containing compound with an inorganic base to form an aqueous mixture having a pH of at least 4, followed by contacting a solid oxide with the aqueous mixture to produce the fluorided solid oxide. Also disclosed are methods for preparing fluorided solid oxides by contacting an acidic fluorine-containing compound with a solid oxide to produce a mixture, followed by contacting the mixture with a inorganic base to produce the fluorided solid oxide at a pH of at least about 4. The fluorided solid oxide can be used as an activator component in a catalyst system for the polymerization of olefins.

The invention provides a lithium ion halide solid electrolyte, the chemical composition of the lithium ion halide solid electrolyte is LixMa + Nb + yClx + a + by, a is the valence of an element M, and b is the valence of an element N; 1 < = x < = 4, 0lt; y < = 1, 2 < = a < 5, and 2 < = b < = 5. The lithium ion halide solid electrolyte provided by the invention not only has high room-temperature ionic conductivity, but also has relatively good negative electrode contact stability due to relatively low valence. The invention also provides a preparation method of the lithium ion halide solid electrolyte, the raw materials adopted by the method are low in cost, and the synthesis technical route is simple.

Silicon subhalide-containing composite particles along with processes for producing and uses for the same. Where the silicon subhalide-containing composite particles have a Si content >30% by weight. Wherein the silicon is placed in and on the pores of a porous matrix. The silicon subhalide-containing composite particles include a halogen concentration of 0.0003 to 16% by weight, a pH of 3 to 9, a volume-weighted particle size distribution having diameter percentiles d50 of 0.5 to 20 μm, and a specific BET surface area of at most 170 m2 / g.

The present invention relates to the technical field of new energy materials, and in particular to a lithium argyrodite-type solid electrolyte containing an in-situ precipitation phase of lithium halide, and a preparation method and application thereof. The electrolyte is obtained by doping a lithium argyrodite compound with a cation M, wherein the ionic radius of the cation M is greater than the ionic radius of phosphorus. The electrolyte induces a cation M (specifically Al, Si, Sc, Y, Zr) with a large ionic radius to occupy the P position through high-energy ball milling, realizes the doping of the P position, and forms a series of new cation M-doped lithium argyrodite sulfide electrolyte materials, thereby improving the uniform distribution of halogen X inside the grains and avoiding the formation of a LiX coating layer on the surface of the grains; metastable halogen X atoms accompany Li atoms to precipitate LiX microparticles in situ, which are dispersed at the grain boundaries, greatly inhibiting the deposition and growth of metallic lithium inside the electrolyte, greatly improving the ability to inhibit lithium dendrites, and enabling all-solid-state batteries to operate at high current density.

The application provides a quartz sand acid washing waste liquid resource treatment method, and belongs to the field of industrial waste water treatment, and comprises the following steps: adding magnetic composite seeds to the quartz sand acid washing waste liquid, and performing magnetic separation after stirring treatment; adding soluble potassium salt to the treated waste liquid to recover potassium fluosilicate; treating the filtrate through diffusion dialysis to obtain recovered acid and dialysis residual liquid; the diffusion dialysis treatment adopts an asymmetric membrane, the asymmetric membrane has a physical gradient of one side being a dense structure and the other side being a loose structure, and the dense structure side is in contact with the waste liquid; and adding calcium oxide or calcium hydroxide to the dialysis residual liquid for deep treatment and calcium recovery. The application provides a quartz sand acid washing waste liquid resource treatment method which is low in treatment cost, high in resource recovery rate and friendly to the environment, and realizes the differentiated resource recovery of the quartz sand acid washing waste liquid.

The utility model discloses green low-carbon water alkaline washing equipment for preparing monochlorodifluoromethane. The green low-carbon water alkaline washing equipment comprises a water washing tower and an alkaline washing tower, the upper end of the water washing tower is communicated with a series pipe, and the other end of the series pipe is communicated with the lower end of the alkaline washing tower; a plurality of grating plates are arranged in the water washing tower and the alkaline washing tower; fillers are arranged on the grating plates; observation windows are arranged on the water washing tower and the alkaline washing tower and are higher than the filler; a heat utilization structure is arranged between the water washing tower and the alkaline washing tower; a waste liquid utilization structure is arranged. According to the utility model, gas led out from the alkaline washing tower enters the heat exchanger to be condensed into liquid, heat release occurs in the process, water in the water storage tank circulates in the heat exchanger, the heat can be utilized and absorbed, the temperature of the water is changed, and the washing effect can be improved when the water enters the water washing and alkaline washing procedure subsequently; and waste liquid flowing out of the water washing tower can be recycled.

The invention discloses a wet-process phosphoric acid defluorination residue recycling coupling device and a production method, the coupling device is arranged in a wet-process phosphoric acid production system, and the coupling device comprises a spiral mixing reactor (1), a mixing reactor (2) and a fluorine-containing gas washing and recycling device (3) which are sequentially arranged and connected; the production method comprises the following steps: adding concentrated sulfuric acid with the temperature of 80-90 DEG C into the wet-process phosphoric acid defluorination residues and silica fume in a spiral mixing reactor according to the mass ratio of 100: (5-10), reacting for 40-60 minutes, controlling the reaction temperature to be 90-100 DEG C, returning slurry B to a wet-process phosphoric acid production pre-extraction system, and separating and purifying the slurry B to obtain the wet-process phosphoric acid defluorination residues. Fluorine-containing gases SiF and HF generated by the mixing reaction are sent to a fluorine-containing gas washing and recycling device through a waste gas main pipe to be washed to obtain a 8-15% fluosilicic acid solution. The coupling device is coupled with an existing wet-process phosphoric acid production system, a large number of newly-added equipment and procedures are reduced, the whole process is free of three-waste emission, the method is simple in process, the fluorine recovery rate is larger than or equal to 83%, meanwhile, phosphorus is efficiently recovered, and pollution of fluorine resources to the environment is reduced.

The invention relates to the technical field of magnesium fluosilicate production, in particular to a preparation method of magnesium fluosilicate for a concrete hardener, which comprises the following steps: adding a magnesium-containing compound into a fluosilicic acid solution to obtain a mixed solution; when it is judged that the preparation of the mixed solution does not meet the preset standard according to the turbidity gradient of the mixed solution, the preset adding rate is reduced; adding an impurity removal agent into the mixed solution meeting the preset standard, stirring, standing, precipitating and filtering to obtain magnesium fluosilicate filtrate; concentrating the magnesium fluosilicate filtrate until crystals are separated out to obtain magnesium fluosilicate crystal slurry; judging whether the preparation of the magnesium fluosilicate crystal slurry meets a preset standard or not according to the gray value variance; and carrying out centrifugal separation on the magnesium fluosilicate crystal slurry meeting the preset standard to obtain wet magnesium fluosilicate crystals, and drying the wet magnesium fluosilicate crystals to obtain a magnesium fluosilicate product. The preparation efficiency of the magnesium fluosilicate is improved.

Disclosed herein are methods for preparing fluorided solid oxides by contacting an acidic fluorine-containing compound with an inorganic base to form an aqueous mixture having a pH of at least 4, followed by contacting a solid oxide with the aqueous mixture to produce the fluorided solid oxide. Also disclosed are methods for preparing fluorided solid oxides by contacting an acidic fluorine-containing compound with a solid oxide to produce a mixture, followed by contacting the mixture with a inorganic base to produce the fluorided solid oxide at a pH of at least about 4. The fluorided solid oxide can be used as an activator component in a catalyst system for the polymerization of olefins.

The invention discloses a homogeneous reactor and application thereof, and belongs to the technical field of reactors. Comprising a stirring tank and a stirrer, wherein the stirrer comprises a stirring shaft coaxially arranged in the stirring tank, a motor for driving the stirring shaft and stirring blades on the stirring shaft; the lower part of the stirring tank is provided with a feed port, the top of the stirring tank is provided with an exhaust port, the lower part is a straight cylinder section, and the upper part is an expansion part; a lower guide cylinder is coaxially arranged at the lower part in the straight cylinder section, an upper guide cylinder is coaxially arranged at the upper part in the straight cylinder section, a plurality of spoilers are uniformly distributed on the inner wall of the top of the straight cylinder section, and a discharge hole is formed in the side wall of the top of the straight cylinder section; an upper plug flow blade, a lower plug flow blade and a floating foam scattering blade are sequentially arranged on the stirring shaft from bottom to top; the upper flow pushing blade is positioned at the lower part in the lower guide cylinder and is used for pushing liquid upwards; the lower flow pushing blade is positioned at the upper part in the upper guide cylinder and is used for pushing liquid downwards; the floating foam scattering blade is located in the expansion part, located above the liquid level in the stirring tank and used for scattering floating foam on the liquid level.

The application discloses a device for preparing potassium fluosilicate by using mixed acid and belongs to the technical field of potassium fluosilicate preparation, which comprises a fixing frame, the inner side of the fixing frame is provided with a reaction kettle shell, and the inside of the reaction kettle shell is provided with a stirring device; the top of the stirring device is fixedly connected with a gear one, the top sides of the reaction kettle shell are movably connected with a rotating shaft one, the top of the rotating shaft one is fixedly connected with a gear two, the bottom of the rotating shaft one is fixedly connected with a reciprocating screw rod, the outer side of the reciprocating screw rod is movably connected with a sliding plate, the inner side of the reaction kettle shell is fixedly connected with a sliding rod, the outer side of the sliding rod is movably connected with a sliding plate, the outer side surface of the sliding plate is provided with a groove, the inside of the groove is movably connected with a rotating shaft two, the outer side of the rotating shaft two is fixedly connected with a disturbance plate, and the bottom of the disturbance plate is fixedly connected with a flow guide fin. The application is used to solve the problem that the silicon powder is mixed with the mixed acid solution slowly in the early stage of reaction, thereby reducing the overall production efficiency.

This solid electrolyte includes M1, M2, and X, wherein: M1 is an element that forms a monovalent cation, and includes at least one element selected from the group consisting of Li, Na, and K; M2 is at least one element that forms a trivalent cation; X is at least one element selected from the group consisting of F, Cl, Br, and I; and the axial angles α, β, and γ in the unit lattice of the crystal structure are 90°. As a result, a solid electrolyte having high ionic conductivity can be provided.

The utility model relates to the technical field of preparation of anhydrous hydrogen fluoride from fluosilicic acid, in particular to a fluosilicic acid concentration system for anhydrous hydrogen fluoride production, which comprises a fluorine-containing waste gas scrubber group, a dilute fluosilicic acid feeding tank, a fluosilicic acid concentrator group and a silicon dioxide separation tank which are connected in sequence, and a liquid phase outlet at the bottom of the silicon dioxide separation tank is also connected with a fluosilicic acid concentrator through a concentration circulating pump. The system disclosed by the utility model is simple, low in investment and operation cost, high in absorption rate of SiF4 gas, energy-saving and consumption-reducing.

The invention relates to the technical field of chemical product preparation, in particular to pure sandy sodium fluosilicate as well as a preparation method and application thereof. The preparation method of the pure sandy sodium fluosilicate comprises the following steps: S1, adding industrial sodium sulfate into hot water, dissolving, filtering to obtain a sodium sulfate solution, slowly adding the sodium sulfate solution into a fluosilicic acid solution according to a molar ratio of the fluosilicic acid solution to the sodium sulfate solution of 1: 1, stirring, centrifuging, and filtering to obtain a sodium fluosilicate filter cake; s2, dissolving the sodium fluosilicate filter cake in pure water according to a ratio of 1: 30 to obtain a colorless and transparent sodium fluosilicate saturated solution; s3, mixing the crushed ice blocks frozen by the pure water with cold pure water at 0-5 DEG C to obtain an ice-water mixture; preparing a sandy sodium fluosilicate seed crystal; s4, adding an ice-water mixture into the sodium fluosilicate saturated solution; meanwhile, adding sandy sodium fluosilicate seed crystals; s5, sodium fluosilicate crystals are separated out, the sodium fluosilicate crystals are centrifuged and dried, and a sand-like sodium fluosilicate finished product is obtained.

The solid electrolyte contains Na, M [alpha], M [beta], and F, where M [alpha] is at least one element that is a trivalent cation, and M [beta] is at least one element that is a tetravalent or higher cation. As a result, it is possible to provide a solid electrolyte having high ion conductivity. Preferably, M [beta] is an element having a tetravalent cation, the solid electrolyte contains a component represented by the compositional formula Na3-xM [alpha] 1-xM [beta] xF6, and 0 < x < 1 is satisfied.

The invention discloses a production system of hexachlorodisiloxane, which includes a reactor, a primary condensation system, a distillation system and a final condenser. A method for producing hexachlorodisiloxane, which includes the following steps: S1: reaction; S2: primary condensation; S3: distillation; S4: final condensation. Advantages: The invention utilizes silicon tetrachloride and anhydrous ethanol to react under the catalysis of a catalyst to produce hexachlorodisiloxane, and produces hydrogen chloride gas and methane as by-products. After primary condensation, the hydrogen chloride gas is discharged as a light component, and the liquid obtained by the primary condensation is separated and purified by a distillation system to obtain liquid hexachlorodisiloxane, and high-purity hexachlorodisiloxane can be obtained by reasonably controlling the raw material ratio and the reaction temperature.

A sulfide solid electrolyte includes: a Li element; a P element; a S element; and a Ha element. The sulfide solid electrolyte has an argyrodite crystal structure. The crystal structure includes a plurality of PS4 tetrahedrons where the P element may be substituted and at least a part of the S elements may be substituted. The crystal structure includes 16 elements serving as the vertices of the PS4 tetrahedrons T1 in a unit cell. When the 16 elements are made to correspond to 16 S elements constituting vertices corresponding to 16e sites of PS4 tetrahedrons T2 in a space group F-43m, an average value of a distance Δ between respective positions of the 16 elements in the PS4 tetrahedrons T1 and respective positions of the 16 S elements in the PS4 tetrahedrons T2 corresponding thereto is 0.05 Å to 0.30 Å.

Provided is a method for producing an inorganic fluoride luminescent material having exceptional luminescence characteristics by using a non-aqueous hydrogen-fluoride-containing liquid.　A method for producing an inorganic fluoride luminescent material, the method including bringing a first inorganic fluoride luminescent material and a non-aqueous hydrogen-fluoride-containing liquid that has a hydrogen fluoride content in the range of 20-100 mass% (inclusive) into contact with each other to obtain a non-aqueous solution containing ions derived from the first inorganic fluoride luminescent material, and bringing the non-aqueous solution and a non-aqueous organic liquid that has a hydrogen fluoride content of less than 20 mass% into contact with each other to precipitate a second inorganic fluoride luminescent material.　

The utility model provides a treatment system for slag slurry in a trichlorosilane production process. The treatment system comprises an evaporation unit, a chlorosilane recovery unit, a hydrolysis unit and a hydrolysis tank gas treatment unit, the evaporation unit comprises a slurry tank and a cylindrical cone dryer, and a slurry pump is arranged on a slurry pipeline; the chlorosilane recovery unit comprises a heat exchanger and a chlorosilane storage tank, and a liquid outlet of the heat exchanger is communicated with the chlorosilane storage tank; the hydrolysis unit comprises a screw pump, a hydrolysis tank, a rectification high-boiling pipeline and a calcium oxide adding groove, the inlet end of the screw pump is connected with a bottom outlet of the cylindrical cone dryer, the outlet end of the screw pump is connected with an upper feed port of the hydrolysis tank, the outlet end of the rectification high-boiling pipeline is connected with a feed port of the hydrolysis tank, and the calcium oxide adding groove is communicated with the top of the hydrolysis tank; and the hydrolysis tank gas treatment unit is connected with a top gas outlet of the hydrolysis tank. According to the invention, efficient recovery of chlorosilane in the slag slurry generated in the production process of trichlorosilane is realized, and pollution of hydrogen chloride to the environment in the slag slurry treatment process is avoided.

The invention provides a quartz sand pickling waste liquid resourceful treatment method, which belongs to the field of industrial wastewater treatment, and comprises the following steps: adding a magnetic composite seed crystal into quartz sand pickling waste liquid, stirring, and carrying out magnetic separation; adding soluble potassium salt into the treated waste liquid to recover potassium fluosilicate; carrying out diffusion dialysis treatment on the filtrate to obtain recycled acid and dialysis residual liquid; the diffusion dialysis treatment adopts an asymmetric membrane, one surface of the asymmetric membrane is of a compact structure, the other surface of the asymmetric membrane is of a physical gradient of a loose structure, and one side of the compact structure of the asymmetric membrane is in contact with the waste liquid; and adding calcium oxide or calcium hydroxide into the dialysis raffinate for deep treatment and calcium recovery. The resource treatment method for the quartz sand pickling waste liquid is low in treatment cost, high in resource recovery rate and environmentally friendly, and quality-divided resource recovery of the quartz sand pickling waste liquid is achieved.

The invention discloses a solid-state battery material recovery method, and relates to the technical field of solid-state battery recovery, and the method comprises the following steps: heating first mixed powder in air to obtain second mixed powder; the second mixed powder is leached through organic weak acid and a reducing agent, first leaching residues and first leaching liquid are obtained, and then the first leaching liquid is processed through a wet process; the first leaching residues are leached with sulfuric acid, and second leaching residues and second leaching liquid are obtained; precipitating lanthanum oxalate from the second leaching solution to obtain a first mixed solution; precipitating lithium carbonate from the first mixed solution; the second leaching residues are leached with hydrofluoric acid, and third leaching liquid and carbon are obtained; precipitating zirconium oxalate from the third leaching solution to obtain a second mixed solution, and concentrating the second mixed solution to obtain fluosilicic acid. Through heating, step-by-step leaching, a wet process, precipitation separation and the like, valuable metals, silicon and carbon are efficiently separated and recycled, copper and aluminum impurities are removed, the resource utilization rate is effectively increased, and the feasibility of industrialization is remarkably improved.

This invention relates to heterovalent substituted argyrodite-type solid electrolytes. These solid electrolytes exhibit increased ionic conductivity.

The invention provides a photovoltaic waste acid solution treatment method and system.The method comprises the steps that potassium hydroxide is added into a photovoltaic waste acid solution, a reaction is conducted under the stirring condition, a reaction solution is obtained, and then a potassium fluosilicate filter cake and mixed acid mother liquor are obtained through filtering and washing; the mixed acid mother liquor is evaporated in a reduced pressure evaporation mode, and mixed steam and evaporation residual liquor are obtained; and fractionating the mixed steam. The photovoltaic waste acid is recycled into mixed acid containing hydrofluoric acid, the recycling process is simple, the recycled acid can be reused for an original photovoltaic etching production line and can be used for etching treatment of ultrathin display screens at the same time, and the market capacity is large.

This application relates to phosphor materials for light sources and methods for manufacturing the same. One method includes: mixing a first fluoride phosphor powder doped with tetravalent manganese with a processing solution for a specified time period; stopping the mixing to allow the fluoride phosphor powder to settle; removing at least some liquid that has separated from the first fluoride phosphor powder; repeating the steps of (a) mixing, (b) stopping the mixing, and (c) removing at least some of the liquid during one or more additional cycles; and obtaining a second fluoride phosphor powder after repeating the steps of mixing, stopping the mixing, and removing at least some of the liquid. The second fluoride phosphor powder contains a reduced amount of manganese compared to the first fluoride phosphor powder.