151 results about "Impurity ions" patented technology

Generation of impurity ions is prevented or reduced in a carbon ion generating device in which a laser-driven ion acceleration system is employed. A carbon ion generating device generates a carbonized region by irradiating a film made of an organic compound with a first laser beam, and generates carbon ions by irradiating at least a part of the carbonized region with a second laser beam.

The invention discloses a method for preparing a vanadium electrolyte by extracting a sodium salt roasting vanadium extraction leaching solution, and belongs to the technical field of vanadium electrolytes. In order to improve the impurity separation depth and the product purity of the vanadium electrolyte, the invention provides a method for preparing the vanadium electrolyte by extracting a sodium salt roasting vanadium extraction leaching solution, which comprises the following steps: removing silicon from the leaching solution, selectively reducing and acidifying, extracting anions, washing, reducing and reversely extracting, degassing and deoiling, and electrolyzing to obtain the 3.5-valent vanadium electrolyte. According to the method, the sodium-modified vanadium-containing leaching solution is used as a raw material, anions in the solution are completely converted into cations in a mode of combining pretreatment deep silicon removal with selective reduction acidification, vanadium is in an anion form, all impurity ions in the solution are efficiently separated through anion extraction-reduction reverse extraction, and the purity of the vanadium-containing leaching solution is improved. The prepared vanadium electrolyte product is extremely low in impurity ion content, the vanadium yield is remarkably improved, and the preparation cost of the high-purity vanadium electrolyte is greatly reduced.

This invention discloses a method for preparing high rare-earth-doped low-loss boron-containing glass optical fibers. The steps are as follows: weigh glass raw materials containing rare-earth oxides and boron oxide, mix them uniformly, and place them in a high-temperature furnace. First, heat the mixture under a high-purity nitrogen atmosphere, then switch to a high-purity oxygen atmosphere or a high-purity air atmosphere for continued heating. The resulting glass melt is cooled and annealed to obtain a large glass block. The glass is then processed into a preform and placed in an optical fiber drawing furnace for fiber drawing under a high-purity oxygen atmosphere, thus achieving the preparation of high rare-earth-doped low-loss glass optical fibers. This invention eliminates the additional glass matrix absorption in the near-infrared region caused by boron in boron-containing glass optical fibers and also transforms the transition metal impurity ions from a low valence state with broad absorption in the near-infrared region to a high valence state with narrow low absorption in the near-infrared region. Both of these aspects significantly reduce the matrix absorption of boron-containing glass optical fibers, providing possibilities for the application of high rare-earth-doped low-loss glass optical fibers.

The invention provides a method for synergistically removing impurities through pH regulation and complexing of ionic rare earth ore leachate, the ionic rare earth ore leachate is stirred and mixed uniformly, a plant polyphenol sulfonic acid derivative complexing agent is added, the complexing agent is prepared through sulfonation, neutralization, concentration and drying by taking gallic acid as a raw material, and the complexing agent can automatically regulate the pH value of the solution and stabilize the pH value at 5.1-5.3; under the condition, phenolic hydroxyl groups, carboxyl groups and sulfonic functional groups in complexing agent molecules preferentially form stable precipitates with impurity ions such as Al < 3 + > and Fe < 3 + > in the leachate, and the complexing effect with rare earth ions (RE < 3 + >) is weak; and after the reaction is completed, carrying out solid-liquid separation to obtain the purified leachate and impurity-containing precipitation slag. The method solves the problem of ammonia nitrogen pollution caused by use of ammonium bicarbonate, ammonia water and other ammonium salts in the traditional process, is a novel method with high impurity removal rate, simple process flow and environmental friendliness, and is suitable for industrial application.

The application relates to the technical field of alumina preparation, and particularly discloses a method for reducing the alkalinity of alumina, which comprises the following operations: firstly, mixing alumina with an additive and an organic acid, then performing ball milling, and finally performing calcination; the additive can promote the adhesion of the organic acid and the alumina; the additive and the organic acid are both decomposed into water and carbon dioxide after calcination. The method for reducing the alkalinity of alumina can effectively reduce the pH value of the alumina, does not introduce other impurity ions, is simple to operate, has low energy consumption, and can be used as an adsorbent, a catalyst carrier and an additive in a battery material.

The invention relates to the technical field of photovoltaic material manufacturing, in particular to a quartz crucible manufacturing system and method.The system comprises forming equipment arranged in a first closed space and melting equipment arranged in a second closed space, and a discharging port of the forming equipment communicates with a feeding port of the melting equipment; the first air inlet device is communicated with the first closed space, an air inlet of the first air inlet device is lower than a mold forming position in the forming equipment, and the air inlet angle of the first air inlet device is larger than the included angle between an inclined plane formed by the mold forming position and the air inlet and the horizontal plane. The system and method provided by the invention can significantly reduce the impurity ion content of the quartz crucible, improve the purity of the transparent layer and prolong the service life of the transparent layer.

The utility model relates to the technical field of monopotassium phosphate production, and discloses an impurity removal device for monopotassium phosphate, which comprises an impurity removal pool, a crystallizing pool and a delivery pump, the bottom of the impurity removal pool and the bottom of the crystallizing pool are both communicated with a liquid discharge pipe, and a sealing valve is arranged at the port of the liquid discharge pipe; a mounting seat is fixedly mounted on the outer wall of the impurity removal pool, an electric sliding rail is fixedly mounted at the top of the mounting seat, a lifting plate is fixedly mounted at the movable end of the electric sliding rail, after the filter basket enters a solution, the solution can enter the filter basket, crystals separated out by impurities are intercepted by the filter basket, and the impurities are separated out by the lifting plate. The suction pipe in the filter basket sucks the solution entering the filter basket, the solution is transferred into the crystallizing pond through the delivery pump, the hose and the liquid inlet pipe, crystals separated out by impurity ions are still left in the impurity removal pond, and the filter is arranged before the transfer in the whole process, so that the state of the solution can be better maintained; therefore, the solution entering the crystallizing pond is pure enough.

The invention relates to the technical field of comprehensive utilization of non-ferrous metal smelting waste residues, and discloses a harmless treatment and valuable metal recovery method for arsenic-alkali residues, which comprises the following steps: carrying out selective leaching and antimony separation on the arsenic-alkali residues, and precipitating antimony by using solubility product difference to obtain arsenic-containing alkali filtrate; carrying out gradient carbonization crystallization under oxidation-reduction potential clamping on the filtrate, converting sodium carbonate into sodium bicarbonate crystals under the constraint of specific potential by utilizing the salting-out effect of pentavalent arsenic in a saturated sodium bicarbonate solution, separating out the sodium bicarbonate crystals, and filtering and separating to obtain a sodium bicarbonate product and arsenic-rich mother liquor; according to the method, through a coupling mechanism of potential clamping and gradient carbonization crystallization, the solubility difference of arsenic and alkali is constructed, the salting-out effect is utilized, the arsenic-alkali co-dissolution balance is broken on the premise that exogenous foreign ions are not introduced, and the arsenic-rich mother liquor is subjected to terminal mineralization to generate arsenic-containing mineral precipitates. Efficient separation and recovery of antimony and sodium carbonate and deep solidification of arsenic are realized.

The application relates to a thorium and spallation element separation method, which comprises the following steps: injecting a thorium-based solution into column 1 to obtain a first effluent, washing column 1 with a first inorganic acid solution and a second inorganic acid solution in sequence to obtain a first washing solution and a first thorium solution respectively; injecting the first thorium solution into column 2 to obtain a second effluent, washing column 2 with a third inorganic acid solution and a second inorganic acid solution in sequence to obtain a second washing solution and a second thorium solution; mixing the first thorium solution and the second thorium solution, injecting into column 3 to obtain a third effluent, and washing column 3 with a fourth inorganic acid solution to obtain a third thorium solution. The method does not introduce other foreign reagents and is not polluted by foreign impurity ions, and the high ion potential of Th is utilized to preferentially adsorb on a cation column to achieve the purpose of separation from other spallation elements.

The invention discloses a gallium and germanium ion flotation separation method in the technical field of hydrometallurgy, and aims to solve the problems of poor selectivity and low recovery rate when low-concentration gallium / germanium is recovered from a high impurity ion background solution in the prior art. Efficient separation and enrichment of target ions are achieved through the processes of roughing, concentration and scavenging. Wherein a masking agent is added in the concentration stage to deeply purify foam products, and a collecting agent is added in the scavenging stage to maximize the recovery rate. According to the method disclosed by the invention, the simplification and synergistic interaction of the process are realized through the orderly addition of the functional agent and the coupling of the flotation process, the gallium / germanium ion flotation recovery rate can be stabilized at 95% or above within the wide range of pH 1.0-12.0, the key impurity ion entrainment rate is lower than 2%, and the technical problem of loose metal ion flotation separation under a complex system is fundamentally solved.

The invention provides a quenching crystallization reaction system for preparing layered composite metal hydroxides and a corresponding preparation method, a high-pressure cooling distributor is additionally arranged between a reaction kettle and a collecting tank, and the high-pressure cooling distributor comprises a cavity and a quenching device which are communicated with each other; and a low-temperature cooling medium enters the cavity from the quenching device, is in direct contact with the high-temperature reaction slurry and rapidly cools the high-temperature reaction slurry, so that the layered composite metal hydroxide with the surface defect active site can be obtained. According to the invention, a cooling liquid system consistent with hydrotalcite reaction slurry is adopted, construction of defect active sites is realized for hydrotalcite through a quenching type cooling mode under the condition of not introducing impurities, the product performance can be effectively improved, the equipment requirement is low, the process is simple, the cost is effectively reduced, and the method is suitable for industrial production. And meanwhile, the impurity ion introduction problem caused by acid-base solvent etching and the like is also avoided, the process cleanliness is guaranteed, and the method is very suitable for industrial implementation.

The application discloses a touch force sensor and a manufacturing method thereof. The touch force sensor comprises a silicon substrate, a pressure-sensitive resistor and a wire formed by injecting impurity ions into a first surface of the silicon substrate, an insulating film layer located on the first surface of the silicon substrate, the insulating film layer comprising a through hole, a silicon substrate signal electrode layer located on a side of the insulating film layer away from the silicon substrate, the silicon substrate signal electrode layer being electrically connected with the pressure-sensitive resistor and the wire through the through hole, a first annular layer located on a side of the insulating film layer away from the silicon substrate, a surface of the silicon substrate signal electrode layer away from the silicon substrate being in the same plane as a surface of the first annular layer away from the silicon substrate, a glass substrate signal electrode layer located on a side of the silicon substrate signal electrode layer away from the insulating film layer, and the glass substrate signal electrode layer being electrically connected with the silicon substrate signal electrode layer. The application can realize high-precision alignment of the cavity and the pressure-sensitive resistor, and avoid the problems of process risk and stress residue caused by using an insulating thick film to manufacture the cavity.

The invention relates to the technical field of inorganic salt mother liquor treatment, in particular to an inorganic salt mother liquor recycling system based on MVR evaporative crystallization, which comprises three groups of sedimentation tanks and separation cylinders fixedly communicated with the bottoms of the sedimentation tanks, stirring components and sealing conical seats are arranged in the separation cylinders, and the tops of the sedimentation tanks are connected with liquid storage hoppers through liquid inlet pipes. An electromagnetic control valve is arranged on the liquid inlet pipe, and a calcium hydroxide solution, a sodium carbonate solution and a barium chloride solution are sequentially arranged in the multiple liquid storage hoppers from left to right; through staged treatment of the three groups of sedimentation tanks, the ion selective electrode sensor and the controller are combined to precisely add corresponding agents, the hetero ions are removed step by step in a targeted manner, and the subsequent progressive deep purification treatment is matched, so that a high-quality water quality basis is provided for efficient recycling of the mother liquor; and the problems of crystal quality reduction, equipment scaling and the like caused by hetero-ion enrichment are effectively avoided.

This invention discloses a method for the synergistic control and removal of organic matter in the hydrometallurgical process of zinc smelting, belonging to the field of hydrometallurgical technology. It includes the following steps: incorporating the TOC content of manganese ore powder and iron removal agent into quality monitoring and limiting content thresholds; controlling the addition amounts of flocculant, bone glue, and organic cobalt removal agent; and simultaneously adjusting the concentrations of zinc ions and soluble silicon in the supernatant to reduce liquid viscosity, thereby reducing the introduction of impurities at the source; adding activated carbon to the purification process to adsorb organic matter; and adding a waste liquid circulation filtration system to the electrolysis process, while selectively adding modified activated carbon to remove suspended solids, organic matter, colloids, and harmful impurity ions from the electrolytic waste liquid. This invention achieves three main benefits: first, it establishes a synergistic removal system for fine suspended solids, colloids, organic matter, and impurity ions; second, it increases the electrolysis current efficiency to over 90% and reduces cell voltage; and third, it improves the utilization efficiency of fresh liquid and reduces overall production costs.

The invention relates to a method for recovering germanium in germanium distillation raffinate and carrying out gradient purification and impurity removal, belongs to the technical field of germanium distillation raffinate resource recovery, and aims at the characteristics that impurity ions in the germanium distillation raffinate are high in concentration, and germanium and impurities are difficult to effectively separate due to similar properties. Short-process efficient and high-purity productization recovery of germanium in the germanium distillation residual liquid is realized by adopting a pretreatment-ion exchange-chlorination distillation technical route, and comprehensive recovery and resource utilization of lead, chlorine, zinc and the like in the germanium distillation residual liquid are realized by adopting an acidification lead precipitation-negative pressure distillation-neutralization impurity removal technical route. According to the method, the high-purity GeCl4 product is directly extracted and produced from the germanium-containing wastewater by adopting chemical modification and ion exchange methods, and compared with the existing process, the method has the technical advantages of high comprehensive utilization rate, short-range high efficiency, greenness, cleanness and the like.

The invention discloses a method for separating rhenium from a rhenium-rich solution containing molybdenum and tungsten. The method comprises the following steps: extracting a rhenium-rich raw material solution containing ReO4 <-> and impurity ions by using an extraction agent containing hydrophobic ionic liquid to obtain an organic extraction phase containing ReO4 <-> and a raffinate phase containing the impurity ions; wherein the solvent of the raw material solution is water, and the impurity ions comprise one or two of MoO4 < 2-> and WO4 < 2->; the hydrophobic ionic liquid is composed of positive ions and negative ions, the anions are selected from one or more of halide ions, borate anions, carboxylate anions, carbonate anions, nitrate ions, nitrite ions, sulfate anions, sulfite anions, sulfonate anions, phosphate anions, phosphite anions, thiocyanate anions and amino acid ions. The method is high in separation efficiency, simple in technological process, easy to amplify, small in extraction agent loss, capable of being recycled and suitable for industrial production.

The invention relates to a high-energy planetary ball-milling thermochemical purification method for preparing high-purity silica powder from cobblestones. The invention provides an innovative process based on a wet mechanochemical effect to solve the industrial problems that traditional silica powder raw materials mostly depend on high-quality quartzite or high-purity silicon ore, so that cost is high, resources are short, and cobblestones are difficult to use in a high-valued mode due to high impurity content and high compactness. And in cooperation with high-concentration ore pulp, differential dissolution of impurity ions occurs. The process comprises the steps of raw material pretreatment, first-stage high-energy ball milling dealkalization and iron removal, intermediate washing, second-stage high-energy ball milling deep dealumination, post-treatment and the like. In the first stage, iron, potassium and sodium ions on the surface are preferentially removed by using an organic acid system, and in the second stage, an aluminosilicate skeleton is destroyed by using a fluorine-containing auxiliary agent for deep dealumination, so that the technical bottleneck that impurities such as iron and aluminum in the cobblestones are difficult to deeply remove is solved. The SiO2 purity of the silica powder prepared by the technology can reach 99%-99.9%, and the method opens up a new path for efficient utilization of the cobblestones.

The application provides a semiconductor device and a manufacturing method thereof, and an electronic device. The manufacturing method of the semiconductor device comprises the following steps: forming a first source-drain electrode, a first impurity source medium layer, a second impurity source medium layer and a second source-drain electrode in a stacked mode on a substrate, and a first through hole penetrating through the first impurity source medium layer, the second impurity source medium layer and the second source-drain electrode; manufacturing a semiconductor structure, a gate medium structure and a gate electrode in a conformal covering mode of the first through hole; the first impurity source medium layer, the second impurity source medium layer and the second source-drain electrode each surround an outer periphery of the semiconductor structure; based on an annealing process, a part of the semiconductor structure close to the first source-drain electrode is doped by impurity ions in the contacted first impurity source medium layer to form a first doped part, and a part of the semiconductor structure close to the second source-drain electrode is doped by impurity ions in the contacted second impurity source medium layer to form a second doped part. The embodiments of the application can effectively improve the performance of the semiconductor device.

This invention belongs to the field of supercapacitor technology, specifically relating to a molybdenum oxide-molybdenum disulfide@polytannic acid electrode material, its preparation method, and its applications. Using molybdenum foil as the current collector and electrode, this invention prepares a molybdenum oxide-molybdenum disulfide electrode using electrochemical oxidation and hydrothermal methods. A polytannic acid coating is deposited on its surface to prepare a biodegradable molybdenum oxide-molybdenum disulfide@polytannic acid electrode. This electrode is then sandwiched with a biodegradable gel electrolyte and encapsulated with a biodegradable encapsulation material to construct a biodegradable supercapacitor with self-discharge suppression capabilities. By depositing a polytannic acid coating on the surface of the supercapacitor electrode, its self-discharge behavior is suppressed. The polytannic acid coating can prevent parasitic Faraday reactions of impurity ions on the electrode surface and prevent charge transfer, thereby suppressing the capacitor's self-discharge behavior. Simultaneously, the electrode, electrolyte, and encapsulation material can all degrade in simulated body fluids, potentially opening up applications in implantable medical electronic devices.

The present application relates to the technical field of ore dressing, discloses a kind of activator N,N-bis phosphonamidic sulfonates, its structural formula is as shown in formula 1, N,N-bis phosphonamidic sulfonates contain phosphonic acid group (-PO3H2) and sulfonic acid group (-SO3H) two functional groups, with the molecular architecture of double active center synergistic effect;And the preparation method of N,N-bis phosphonamidic sulfonates, with the application of N,N-bis phosphonamidic sulfonates in the field of sulfide ore flotation.The present application first proposes a new type of sulfide ore activator N,N-bis phosphonamidic sulfonates, can effectively destroy the hydrophilic film on the surface of sulfide ore, restores mineral surface activity, both can enhance the adsorption firmness of reagent molecule on the surface of mineral, and also can inhibit secondary adsorption of impurity ions, realizes the efficient enrichment of sulfide ore in raw ore, and it is relatively mild, and the degree of pollution is low.

This invention discloses a process for recovering germanium from germanium-silicon alloy waste, belonging to the field of germanium recovery technology. The process includes the following steps: S1. Oxidizing and roasting the germanium-silicon alloy waste to obtain roasted clinker; S2. Sulfidating and fixing the roasted clinker and pyrite to obtain activated clinker; S3. Leaching the activated clinker with sulfuric acid, followed by solid-liquid separation, and collecting the germanium-containing leachate; S4. Performing multi-stage countercurrent extraction on the germanium-containing leachate using an amine extractant to obtain a loaded organic phase; then back-extracting the loaded organic phase with an alkaline back-extraction solution to obtain a germanate solution; S5. Hydrolyzing and precipitating the germanate solution to obtain pure germanium dioxide. The roasting process of this invention fixes impurities and activates elemental germanium into soluble germanium dioxide. The purification stage efficiently separates germanium from other impurity ions, and the final hydrolysis precipitation controls product consistency. This invention's recovery process has high recovery efficiency and purity, is more environmentally friendly, and is expected to achieve large-scale production.

The invention provides a recycling method of ammonium chloroplatinate reduction waste liquid. The recycling method comprises the following steps: providing waste liquid from an Nth-batch reduction process; detecting the concentration of one or more target impurity ions in the waste liquid, and comparing the concentration with a preset threshold value; if the concentrations of all the impurity ions do not exceed the corresponding threshold values, the waste liquid is directly used as a precipitator for the (N + 1) th batch of ammonium chloroplatinate precipitation process; if any impurity ion exceeds the standard, directional purification treatment is conducted on the waste liquid, after the concentration of the ions exceeding the standard is reduced, the purified waste liquid is used as a precipitator of the (N + 1) th batch, and therefore cyclic utilization and purity control of the waste liquid are achieved.

The invention provides a method for recycling and extracting rare earth elements in tailings, and belongs to the technical field of recycling and extracting rare earth elements in tailings. Predicting a three-dimensional flow field and setting liquid injection parameters by using a three-dimensional seepage grid adaptive subdivision algorithm and a permeability three-dimensional geological statistical model, and adaptively adjusting the ammonia adding amount according to a saponification state evaluation function and model prediction control; the leachate is pumped into a functionalized ion imprinted polymer adsorption column, selective adsorption is achieved through an online pH micro-control system, finally, a rare earth oxide product is obtained through gradient elution and firing, and a detection result is fed back to a model training data set; the technical problem that saponification extraction and adsorption separation procedures cannot be adaptively regulated and controlled due to the fact that the rare earth ion concentration and the impurity ion concentration of the leachate cannot be accurately predicted in real time in the leaching process is solved.

The invention belongs to the technical field of preparation of iron oxide powder, and particularly relates to a production method of high-efficiency and environment-friendly high-purity iron oxide powder, which comprises the following steps: preparing soluble iron salt into an aqueous solution, adding a dispersing agent into the aqueous solution, and uniformly stirring; carrying out atomization treatment on the obtained solution through a pressure type atomizer or an airflow type atomizer; the atomized liquid drops enter a high-temperature reaction furnace, and air or oxygen is introduced into the high-temperature reaction furnace at the same time until atomization is finished; a product obtained after reaction enters a cyclone separator along with airflow for preliminary separation, and then fine collection is performed through a bag-type dust collector; and washing the collected ferric oxide crude product with deionized water for multiple times to remove impurity ions left on the surface, and drying. The method has the advantages of compact process flow, high reaction speed and controllable product performance. And the reaction contact area is increased through the atomization process, so that the oxidation reaction is rapidly carried out, the problem of non-uniform particle size distribution or easy agglomeration of the product in the traditional method is avoided, and the production efficiency is improved.

This invention belongs to the field of targeted α-nucleonite separation and extraction technology, specifically disclosing a method for separating and extracting lead-212 and bismuth-212 using anion exchange fibers. An acidic thorium solution is passed through an anion exchange fiber column, utilizing the fact that halogen anions can react with Pb. 2+ / Bi 2+ The formation of complex anions is selectively adsorbed by anion exchange fibers. A leaching agent is then introduced to remove other impurity ions. Finally, a desorption agent is introduced to desorb lead-212 and bismuth-212, thus achieving the separation and extraction of lead-212 and bismuth-212 from the natural thorium decay chain. This invention utilizes the above-described method for separating and extracting lead-212 and bismuth-212 using anion exchange fibers. This method eliminates the need for accelerators or reactors, and offers advantages such as simple equipment and the ability to simultaneously handle radioactive waste treatment and disposal while also enabling the separation and extraction of high-value-added targeted alpha nuclides.

The invention discloses a rare earth purification-oriented polyacid conductive nanofiltration membrane as well as a preparation method and application thereof. The nanofiltration membrane comprises a porous base membrane and a selective separation layer attached to the porous base membrane, wherein the selective separation layer consists of a polyamine polymer, polyoxometallate (POMs) and polyfunctional group acyl chloride. According to the preparation method, a layer-by-layer self-assembly synergistic interfacial polymerization strategy is adopted, an intermediate layer is constructed through electrostatic interaction of polyamine and POMs, and then a cross-linked network is formed through interfacial polymerization. The membrane has excellent electrical conductivity and electrical responsiveness, in the purification process of rare earth leaching liquid, efficient separation of rare earth ions and high-valence impurity ions such as calcium and magnesium is achieved by applying an external electric field and utilizing specific interaction of POMs and the rare earth ions, the separation factor is remarkably increased, and the separation efficiency is improved. The problem that a traditional nanofiltration membrane is insufficient in separation precision of similar high-valence ions is solved.

This application provides a dual-membrane eluent generator and a chromatographic detection device. The dual-membrane eluent generator includes a stock solution channel; an eluent channel, with a first ion exchange membrane assembly (including at least one ion exchange membrane) disposed between the eluent channel and the stock solution channel; and a regenerated solution channel, with a second ion exchange membrane assembly (including one bipolar membrane) disposed between the eluent channel and the regenerated solution channel. Hydrogen ions or hydroxide ions generated after electrolysis of the regenerated solution at the bipolar membrane enter different sides of the bipolar membrane, preventing impurity ions from entering the eluent channel through the bipolar membrane. The chromatographic detection device provided in this application includes the aforementioned dual-membrane eluent generator. By applying a bipolar membrane between the regenerated channel and the eluent channel, this application can both provide the eluent channel with the corresponding hydrogen ions or hydroxide ions and prevent impurity ions in the regenerated solution from entering the eluent channel, thereby improving the purity of the eluent.

The invention discloses a battery grade ferrous sulfate continuous cooling crystallization method and system based on a crystal form directing agent, and the method comprises the following steps: mixing a purified ferrous sulfate solution with a nanoscale CHA / MOR molecular sieve crystal form directing agent, feeding the mixture into a multi-stage continuous crystallization kettle, carrying out temperature control crystallization, and finally carrying out solid-liquid separation to obtain a product, the system correspondingly comprises a crystallization kettle, a crystal form guiding agent and a seed crystal adding unit which are connected in sequence, the crystal morphology is actively regulated and controlled by utilizing the specific crystal form guiding agent, and the high-tap-density columnar crystal is obtained; an electric field is arranged in a crystallization transition area, so that in-situ directional migration and deep removal of foreign ions are realized; a crystal form memory elimination module is integrated, impurity circulation is broken through rapid freezing-instantaneous heating, efficient and energy-saving deep purification is achieved, the problems that in battery-grade ferrous sulfate production, the crystal morphology is uncontrollable, the impurity content is high, the technological process is long, and energy consumption is large are synchronously solved, and the product is high in purity and good in physical performance; the method is especially suitable for preparing a lithium ion battery positive electrode material precursor.

This application discloses an electroplating solution impurity removal system. The system includes a coating unit, an ion concentration detector, and an impurity removal unit. The coating unit includes at least two independent and spaced-apart first and second electroplating tanks. The ion concentration detector is located in the first electroplating tank to detect at least the concentration of impurity ions within it. The impurity removal unit is connected to the first electroplating tank via a first pipe assembly, allowing the electroplating solution from the first electroplating tank to flow into the impurity removal unit for impurity ion removal. The impurity removal unit is also connected to the first electroplating tank via a second pipe assembly, allowing the treated electroplating solution to flow back into the first electroplating tank from the second pipe assembly. This application solves the problem in the prior art where excessively high ion concentrations in the surface-modified material within the electroplating mother liquor adversely affect the performance of the conductive film.

The application discloses a kind of sodium fluorosilicate production optimization calculation method, the surface energy of different crystal faces of sodium fluorosilicate is calculated, and the minimum crystal face is selected;For the minimum crystal face of the surface energy, preset the surface of electronic density is used to draw and display surface electrostatic potential and calculate energy;Obtain a preset number of impurity ions, calculate the energy of the preset number of fluorine ions in the minimum crystal face of the surface energy replaced by the impurity ions, and output the energy difference after replacement according to the calculated energy.The application calculates the surface energy of different crystal faces of sodium fluorosilicate, selects the minimum crystal face of the surface energy as the leading crystal face and carries out subsequent calculation.Then, the energy change of the fluorine ion in sodium fluorosilicate replaced by impurity ion is calculated, the binding energy of impurity ion and sodium fluorosilicate leading crystal face is shown by calculation result, the energy change of crystal surface energy and crystal growth caused by impurity ion is given, and the influence of impurity on sodium fluorosilicate production can be accurately judged according to the energy.