373results about "Crystallization separation" patented technology

The invention belongs to the technical field of titanium alloy processing raw materials, and discloses a process and equipment for purifying potassium fluotitanate. The purification equipment comprises primary cleaning equipment, recrystallization equipment and acid treatment equipment; the primary cleaning equipment comprises a primary cleaning tank and a first filter, a material inlet of the primary cleaning tank is connected to the K2TiF6 storage tank through a pipeline, a material outlet of the primary cleaning tank is connected to the first filter through a pipeline, a liquid phase outlet of the first filter is connected to the acid treatment equipment, and a solid phase outlet of the first filter is connected to the recrystallization equipment; the recrystallization equipment comprises a stirring heater, a second filter, a cooling crystallization tank and a third filter which are connected in sequence; the acid treatment equipment comprises an acid storage tank, a neutralization tank, a fourth filter and a distillation tower which are connected in sequence. According to the purification process and equipment disclosed by the invention, residual acid can be removed, the purity of the product is improved, harmful substances can be effectively recovered and treated, the pollution to the environment is reduced, and the economic effect of enterprises is improved.

The invention relates to the technical field of environmental science and engineering, and discloses a method for removing and recycling fluorine ions by promoting calcium fluoride precipitation through sulfate doping, and the method comprises the following steps: S1, preparing sodium fluoride solutions of sulfate with different concentrations, and analyzing the influence of different sulfate concentrations on calcium fluoride precipitation; s2, respectively adding calcium chloride solutions into the prepared sodium fluoride solutions of the sulfates with different concentrations; s3, the two solutions are subjected to a reaction within a set time, filtering is conducted after the reaction is conducted for a period of time, and the fluorine ion removal reaction is completed. By changing the concentration of sulfate in the sodium fluoride solution, the effect of the sulfate in calcium fluoride precipitation and the influence of the sulfate on the fluorine ion removal efficiency are researched; the positive effect and the action mechanism of the low-concentration sulfate in the calcium fluoride precipitation process are defined, and the problems that the influence of the sulfate in the high-fluoride wastewater on calcium fluoride precipitation is ignored, the calcium fluoride purity is low and the recovery difficulty is large are finally solved.

There is disclosed a method for treatment of an aqueous lithium salt-containing solution in a direct lithium extraction process comprising lithium-selective media, wherein the aqueous lithium salt-containing solution comprises one or more foulants, the method comprising the steps of adjusting the oxidative-reductive potential and / or pH of the aqueous lithium salt-containing solution to render the one or more foulants inert to the lithium-selective media; and removing the one or more inert foulants from the aqueous lithium salt-containing solution prior to addition of the aqueous lithium salt-containing solution to the lithium-selective media in a direct lithium extraction process.

The present disclosure relates to methods of removing brominated contaminants from polystyrene waste and recovering the brominated contaminants. The present disclosure further relates to methods of recycling polystyrene waste, wherein the recycling comprises retention of brominated contaminants or removal of contaminants. The present disclosure also relates to use of monocyclic aromatic benzenic solvents in the removal and / or recovery of brominated contaminants from polystyrene waste and in the recycling of polystyrene waste. Moreover, the present disclosure relates to use of the recovered brominated contaminants in the manufacture of polystyrene products such as insulation.

The present disclosure relates to methods of removing brominated contaminants from polystyrene waste and recovering the brominated contaminants. The present disclosure further relates to methods of recycling polystyrene waste, wherein the recycling comprises retention of brominated contaminants or removal of contaminants. The present disclosure also relates to use of monocyclic aromatic benzenic solvents in the removal and / or recovery of brominated contaminants from polystyrene waste and in the recycling of polystyrene waste. Moreover, the present disclosure relates to use of the recovered brominated contaminants in the manufacture of polystyrene products such as insulation.

Single-stage and multi-stage systems and methods for the recovery of critical elements in substantially pure form from lithium ion batteries are provided. The systems and methods include supported membrane solvent extraction using an immobilized organic phase within the pores of permeable hollow fibers. The permeable hollow fibers are contacted by a feed solution on one side, and a strip solution on another side, to provide the simultaneous extraction and stripping of elements from dissolved lithium ion cathode materials, while rejecting other elements from the feed solution. The single- and multi-stage systems and methods can selectively recover cobalt, manganese, nickel, lithium, aluminum and other elements from spent battery cathodes and are not limited by equilibrium constraints as compared to traditional solvent extraction processes.

The invention discloses a method and a system for separating and recovering phosphorus and iron in a phosphorus-containing iron compound, and relates to the technical field of solid waste utilization. The method comprises the following steps: obtaining a crushed phosphorus-containing iron compound and a solid alkaline substance; the crushed ferrophosphorus-containing compound and the crushed solid alkaline substance are taken and placed in a reaction furnace, the ferrophosphorus-containing compound and the solid alkaline substance are fused and react to obtain a first mixed material, and the dosage of the solid alkaline substance is 1-1.2 times of the theoretical molar dosage; adding water into the first mixed material for leaching to obtain a first solid-liquid mixture, and performing solid-liquid separation on the first solid-liquid mixture to obtain a first filter cake and first filtrate; washing and drying the first filter cake to obtain a ferric oxide product; evaporating, concentrating, crystallizing and drying the first filtrate to obtain a phosphate finished product. The method provided by the invention has the advantages of environmental protection and high product quality.

The present invention relates to a process for producing salts from brine obtained from the desalination of seawater. The process can also make it possible to selectively recover NaCl, CaSO4, kainite, carnallite, magnesium sulfate, struvite, newberyite, or potassium bitartrate.

The present invention relates to a bis(fluorosulfonyl)imide salt and a method for preparing the same. More specifically, the present invention provides a novel salt of bis(fluorosulfonyl)imide containing 0.01 ppm to 10,000 ppm of a halogenated alcohol. The present invention further relates to a method for producing the salt of bis(fluorosulfonyl)imide, which comprises crystallizing a raw salt of bis(fluorosulfonyl)imide in a crystallization solvent containing at least a halogenated alcohol. Uses of the salt of bis(fluorosulfonyl)imide are also disclosed.

The application discloses a production system of o-nitrobenzenesulfonyl chloride, which comprises an etherification reaction kettle, a material transfer structure, a recrystallization pool, a separation mechanism and a chlorination reaction kettle. The material transfer structure comprises a rotary driving mechanism, a rotating disc and a charging disc. A plurality of rotating rods are fixedly connected to the rotating disc. The bottom of the charging disc is provided with a filter screen. A filtering station, a recrystallization station, a first drying station, a chlorination station, a second drying station and a discharging station are sequentially arranged around the rotating disc. The recrystallization pool is located directly below the recrystallization station. Drying boxes are respectively arranged below the first drying station and the second drying station. The chlorination reaction kettle is located directly below the chlorination station. The production system of o-nitrobenzenesulfonyl chloride realizes continuous and automatic production of o-nitrobenzenesulfonyl chloride through the arrangement of the recrystallization station and the multiple chlorination stations, guarantees the purity and yield of the product and improves the production efficiency.

Copper concentrate, such as chalcopyrite, is contacted with an aqueous solution containing an acid, and a reducing agent, such as vanadium(II) ions, chromium(II) ions, or zinc tungstoate (HZnW 12 O 40 ). The aqueous solution reduces the copper in the copper concentrate, which can then be dissolved in solution for recovery therefrom or precipitated from solution as copper compounds or elemental copper for recovery as a solid phase product. The solid phase product can then be isolated, dissolved, and further electrowinning to recover the copper product from the copper concentrate. The oxidized reducing agent can be recovered in an electrochemical device with a ferrous reactant. A hydrometallurgical route for converting copper concentrate to copper is potentially cheaper and less polluting than current high temperature smelting processes, and is an advantageous response to environmental and economic pressures for increased copper production.

The invention discloses a non-contact material pre-crystallizer for granulation, and relates to the technical field of crystallizers, the non-contact material pre-crystallizer for granulation comprises a fixed mounting base, a speed reducer plate frame is mounted above the fixed mounting base, and the right end of the speed reducer plate frame is provided with a driving gear disc capable of rotating an inner cylinder. The problems that a traditional granulation crystallizer depends on contact type mechanical operation, materials are gathered through physical acting force or by directly adding reagents, the product uniformity and the process effect can be seriously reduced in the aspects of energy consumption, efficiency and the like, material particles are prone to being mutually bonded or directly bonded in a container through contact type operation, and the production cost is high are solved. The problems that in the prior art, due to the fact that the mixing speed is different, follow-up cleaning is difficult, meanwhile, along with the different mixing speeds, the crystallization degree of material particles is different, and in the material particle input and discharge process, a conventional crystallizer can only conduct quantitative operation on materials, and continuous operation cannot be achieved are solved.

The invention relates to the technical field of brackish water desalination, and discloses a brackish water desalination system and method.The system comprises a primary water treatment device, a secondary water treatment device, a freezing pond, a tertiary water treatment device and a quaternary water treatment device, the secondary water treatment device is connected with the primary water treatment device, the secondary water treatment device is suitable for separating tail water, the freezing pool is connected with the secondary water treatment device, the tertiary water treatment device is connected with the freezing pool, and the quaternary water treatment device is connected with the tertiary water treatment device. The tail water is sequentially subjected to multi-stage separation and purification of the second-stage water treatment device, the freezing pool, the third-stage water treatment device and the fourth-stage water treatment device, salt and alkali in the tail water can be separated out, tail water treatment is achieved, the final product only comprises salt, alkali and water, and the tail water treatment device has the advantages of being simple in structure and good in tail water treatment effect.

A method for recovering lithium bis(fluorosulfonyl)imide is provided in the present application. The method of the present application comprises: mixing a slag from lithium bis(fluorosulfonyl)imide production process with a solvent of carbonate ester, to obtain a mixed material; subjecting the mixed material to solid-liquid separation, to obtain a discharged liquid and a solid slag; monitoring the chromaticity of the discharged liquid and comparing the chromaticity of the discharged liquid with a chromaticity reference; recycling the discharged liquid to the mixed material, if the chromaticity of the discharged liquid is higher than the chromaticity reference; and recycling the discharged liquid to lithium bis(fluorosulfonyl)imide production process, if the chromaticity of the discharged liquid is lower than or equal to the chromaticity reference.

Provided herein are method of recycling metallic ion content from inorganic solid and systems thereof. The methods and systems include contacting inorganic solid with an acid to produce said concrete precursors.

The utility model relates to the technical field of triazole crystallization, and discloses kettle equipment applied to triazole crystallization. The lifting support is arranged, the cross clamping strip is arranged on the rotating shaft, and the cross through hole is formed in the middle of the mounting ring, so that the position of the mounting ring is not changed in the downward moving process of the rotating shaft, and the rotating shaft synchronously drives the mounting ring to rotate in the rotating process. Through mutual cooperation of the first connecting rod, the second connecting rod, the L-shaped scraping rod, the vertical mounting plate and other parts, in the falling process of the rotating shaft, the second connecting rod can push the vertical mounting plate to turn outwards by a certain angle, so that the wall cutting part can be tightly attached to the inner wall of the reaction kettle; therefore, crystals on the inner wall of the reaction kettle can be scraped off more efficiently. The equipment is compact in structure, and has longer service life and lower equipment failure rate compared with the mode that a spring is tightly attached to the inner wall of the reaction kettle.

A high-salinity wastewater salt recovery and wastewater reuse device comprises a separation tank and a drying assembly, three sets of supporting columns are fixedly installed on the outer side of the separation tank, the drying assembly is installed among the three sets of supporting columns, an oil extraction mechanism is installed in the separation tank, a scraping mechanism is installed in the separation tank, and the oil extraction mechanism is connected with the scraping mechanism. And the scraping mechanism comprises a gear ring, the gear ring is rotationally connected to the interior of the separation tank, and the lower end of the gear ring is fixedly connected with two sets of scraping plates. By arranging the oil extraction mechanism and utilizing the buoyancy principle of the floating barrel, effective separation of grease and light components in the high-salinity wastewater is achieved, due to the design, the oil separation efficiency is improved, pollution of oil to the purity of follow-up crystallized salt is avoided, and therefore the high quality of the crystallized salt is ensured; the filtering box can be conveniently overturned and inclined, and filtered impurities are poured into the collecting box, so that the automatic cleaning of the filtering mechanism is realized.

This invention discloses an automated production equipment for hexafluorodianhydride, relating to the field of chemical production technology. Following the production sequence, it includes a microchannel reactor, a concentration vessel, and a crystallization vessel. The microchannel reactor comprises several reactor groups connected in series. Each reactor group includes a first clamping plate and a second clamping plate, with several guide plates disposed between the first and second clamping plates. A temperature regulating plate is installed between adjacent guide plates. The concentration vessel includes a purification chamber and an MBR membrane concentration chamber. The MBR membrane concentration chamber is piped to the reactor group, and the MBR membrane concentration chamber is piped to the purification chamber. Thus, the microchannel reactor ensures thorough mixing of the reaction solution, guaranteeing complete reaction and reducing material waste.

This invention relates to the field of lithium hexafluorophosphate (LiPF6) crystal production, and particularly to a LiPF6 crystal production apparatus, comprising a reaction chamber, a separator for solid-liquid separation of a LiPF6 solution, a crystallizer for condensing the LiPF6 solution connected to the lower side of the separator, and a dryer for heating and drying the crystals connected to the upper side of the separator. The invention involves preliminary filtration of the solution through a separation cylinder, followed by condensation processing in a feed pipe, where dissolved LiPF6 crystals are condensed and precipitated. The height difference between the falling solution and the feed tray causes the solution to splash onto the feed pipe wall, increasing the contact area between the solution and the pipe wall, thereby increasing the condensation efficiency and improving the production quality of LiPF6 crystals.

There is provided a method for recovering lead from copper smelting dust according to the present invention includes an alkali leaching step of leaching lead contained in copper smelting dust with an alkali solution, a step of performing a solid liquid separation on a post-leaching solution and a leaching residue after the alkali leaching step, a neutralization step of adding an acid to the separated post-leaching solution to precipitate a lead, and a step of recovering a precipitate containing the lead by performing a solid liqiud separation.

The invention discloses a concentrated solution freezing crystallization machine for salifying preparation of erythromycin oxime, and relates to the technical field of salifying preparation of erythromycin oxime, the concentrated solution freezing crystallization machine comprises a rack, a supporting plate is fixedly connected to the position, close to the edge, of the bottom of the rack, and a guide sliding groove is formed in the lower position of the surface of the supporting plate; and the top of the rack is fixedly connected with a hoist. According to the concentrated solution freezing crystallizer for salifying preparation of erythromycin oxime, a cavity is formed in the position between the temperature adjusting assembly and the temperature slowing assembly, heating water is introduced into the cavity, erythromycin oxime salt is evaporated and concentrated through water bath heating, then hot water is discharged to enable the temperature of a concentrated solution to reach a metastable area, and the interior of the temperature slowing assembly is slowly cooled; the erythromycin oxime crystals are separated out, the electric rotary table drives the magnetic sliding block to rotate, the temperature slowing assembly scrapes off the adhered crystals, and the problems that the heat transfer performance is deteriorated and the yield of the erythromycin oxime is low due to the fact that crystal scales are very easy to crystallize between a cooled solution and a heat transfer surface are solved.

The present invention relates to a plant for purifying a crude composition by crystallization, wherein the plant comprises at least one crystallizer, at least one buffer vessel and at least two heat pumps, wherein each of at least two heat pumps is connected with at least one buffer vessel, as well as to a process for purifying a crude composition by crystallization being performed in such a plant.

The invention discloses a gas bath crystallization multilayer furnace, and relates to the technical field of gas bath crystallization. The gas bath crystallization multilayer furnace comprises an equipment shell, a frame is arranged on the inner surface of the equipment shell, and a PLC display screen, a power indicator lamp, an emergency stop switch, an air switch, a double door, a PLC control screen and an external temperature control meter are arranged on the outer surface of the equipment shell. A heating cavity, a first lead screw driving mechanism, a second lead screw driving mechanism, a water cooling plate, a lead screw driver and a lead screw switching power supply are arranged in the equipment shell, a fixing plate and a back plate are arranged in the frame, a temperature control solvent bottle is arranged on the upper surface of the fixing plate, and a first guide pipe is arranged at the top of the temperature control solvent bottle; a second guide pipe is arranged on the outer surface of the first guide pipe, and a third guide pipe is arranged at the end of the second guide pipe. Not only can a product be heated, but also corresponding gas can be introduced in the heating process, so that the gas forms gas bath crystals on the surface of the product, the automation degree is relatively high, and the working efficiency is also relatively high.

The method for isolating a lithium precursor according to the embodiment of the present application includes the steps of preparing a primary precursor mixture including a primary lithium precursor and a primary transition metal precursor, mixing the primary precursor mixture with a precipitation solution in a reactor to form a precursor mixture, and injecting a non-reactive gas into the precursor mixture. Accordingly, the lithium precursor can be isolated with high purity and high efficiency.

The invention relates to the technical field of chemical engineering, and provides a calcium chloride and magnesium chloride production device and a production method for preparing calcium chloride and magnesium chloride from dolomite, and the production device comprises a pretreatment assembly, a first-stage reaction kettle and a second-stage reaction kettle which are connected in sequence. The second-stage reaction kettle comprises a tank body, a first outlet formed in the upper part of the tank body and a second outlet formed in the bottom of the tank body. The first outlet is sequentially connected with a water washing tower, a drying device and an evaporation condenser. The second outlet is sequentially connected with a reduced-pressure evaporator, a low-temperature crystallizer, a horizontal centrifuge, a purification tank and a normal-pressure evaporator. The pretreatment assembly, the first-stage reaction kettle and the second-stage reaction kettle are sequentially arranged, so that gradient control over the reaction process is achieved, it is ensured that the acidolysis reaction is more thorough, the chemical purity of calcium chloride and magnesium chloride is improved, precise separation of gaseous impurities and liquid impurities is ensured, and the purification rate of a final product is further increased.

The utility model relates to a conical surface end socket for cooling crystallization equipment, which is applied to the field of cooling crystallization equipment and comprises an end socket body, a coil pipe is fixedly sleeved on the outer surface of the end socket body, two drain pipes are fixedly connected to the outer surface of the coil pipe, and a heat transfer plate is fixedly connected to the inner wall of the end socket body. The lower end of the end socket body is fixedly connected with a plurality of cooling fins, the outer surface of the end socket body is fixedly connected with a plurality of standby pipes, the lower end of the end socket body is fixedly connected with two discharging pipes, the outer surfaces of the discharging pipes and the lowest standby pipe are fixedly provided with one-way electric valves, and the outer surface of the end socket body is fixedly connected with two fixing plates. By the adoption of the coil pipe and other structures, the coil pipe is arranged outside the end socket, secondary cooling is directly conducted on a black titanium solution entering the end socket, the black titanium solution is discharged after reaching the standard temperature, and the practicability of the end socket is improved.

Solutions and methods are disclosed for the extraction and quantification of cellulose derived from cellulosic biomass samples. Improved extraction yields and selectivities are provided through the use of an extraction solvent mixture comprising an aprotic solvent such as DMSO, a quaternary ammonium salt such as TBAF, and an quaternary ammonium base such as TBAOH. The extracted cellulose can be optionally precipitated using disclosed precipitation solutions to further improve cellulose purity. Extracted cellulose can be measured by hydrolyzing the cellulose to glucose or cellobiose, or by using disclosed spectrophotometric assays of cellulose-salt complexes.

The invention provides a process for generating a metal sulphide comprising nickel and / or cobalt, comprising the steps of: i. forming an aqueous metal sulphate solution by reacting sulphuric acid with a raw material feed comprising nickel and / or cobalt in water; ii. crystallizing said metal sulphate from said aqueous metal sulphate solution to form a crystallized metal sulphate in a mother liquor, the mother liquor comprising an uncrystallized metal sulphate; iii. separating said crystallized metal sulphate from said mother liquor; iv. reacting at least a portion of said uncrystallized metal sulphate with hydrogen sulphide in an acidic aqueous medium, thereby obtaining a slurry consisting of a solid phase comprising a metal sulphide precipitate and an aqueous phase comprising one or more impurities and sulphuric acid; and v. separating said solid phase and said aqueous phase.

The utility model discloses a crystallizing tank, and relates to the technical field of chemical equipment, the crystallizing tank comprises a tank body, a cooling assembly and a heating assembly, the cooling assembly and the heating assembly are mounted on the outer wall of the tank body, a mounting cavity is formed in the tank body, a heat exchange assembly is mounted on the inner wall of the mounting cavity, and the heat exchange assembly communicates with the cooling assembly and the heating assembly separately; the top outer wall of the tank body is fixedly connected with a tank cover, and the top outer wall of the tank cover is fixedly connected with a stirring motor. The heating assembly and the cooling assembly are arranged on the tank body, the heat exchange assembly is arranged in the tank body, and raw materials in the tank body are conveniently heated through the arrangement of the heating assembly, so that part of the raw materials are conveniently heated and stirred, and then the raw materials in the tank body are conveniently and uniformly mixed; and through cooperation of the cooling assembly and the heating assembly, the temperature in the tank body can be conveniently controlled.

For the purpose of reducing contamination of scandium oxide products, the present disclosure provides a method for removing at least one metal contaminant from a scandium (Sc) concentrate. The method is based on contacting the Sc concentrate with an ion exchange resin to obtain a purified Sc eluate or raffinate. The first and second ion exchange resins are strong acid cation resins having sulfonic acid functional groups in the potassium or sodium form. The purified Sc eluate or raffinate can be used to produce a scandium oxide product having reduced amounts of metal ion contaminants.