200 results about "Chelating resin" patented technology

The invention relates to the technical field of resource recycling of manganese-containing wastewater, in particular to a process for preparing industrial-grade manganese carbonate by using a recycled manganese chloride solution, which adopts a two-stage purification and impurity removal strategy, performs primary purification and impurity removal by using sodium sulfide and sodium fluoride, and performs secondary impurity removal by using iminodiacetic acid grafted chelating resin. According to the invention, the problems of poor adaptability and incomplete impurity removal of the manganese chloride solution in the prior art are solved, the purity of the product is obviously improved so as to meet the requirements of the industrial grade manganese carbonate, and the process flow is simple.

The invention discloses an impurity removal device and an impurity removal method for salt separation crystallization mother liquor of chemical high-salt wastewater, and belongs to the technical field of comprehensive utilization of water resources. The impurity removal device comprises a high-density sedimentation tank for receiving high-salinity wastewater salt separation crystallization mother liquor; the first-stage reactor is connected with the high-density sedimentation tank through a pipeline; the second-stage reactor is connected with the first-stage reactor through a pipeline; the three-stage reactor is connected with the filtering device through a pipeline, the filtering device is connected with the mesoporous adsorption tower through a pipeline, the mesoporous adsorption tower is connected with the chelating resin tower through a pipeline, and the chelating resin tower is connected with the modified zeolite adsorption tower through a pipeline. The method has the advantages that equipment configuration is reasonable, and good stability and operability are achieved; the method provided by the invention has outstanding process route originality and low treatment cost, and realizes liquid phase treatment and high-valued cyclic utilization of the chemical high-salinity wastewater salt separation crystallization mother liquor.

The application discloses a kind of processes for continuously preparing high-purity electronic grade hydrogen peroxide, it is related to the technical field of hydrogen peroxide preparation, including the following steps: operator injects corresponding extraction liquid into equipment, then the oxidizing liquid in the oxidizing liquid tank and the high salt water of reverse osmosis mechanism are sent to the bottom of extraction tower body through pipeline, the extraction tower body is filtered by setting multiple groups of sieve plates and chelating resin discs inside the body to impurities in the extraction process, the liquid outlet valve and liquid inlet valve at the outer end of extraction tower body are connected with the corresponding purification tower body, reverse osmosis mechanism and oxidizing liquid tank around; the oxidizing liquid and high salt water from the bottom of extraction tower body enter the top of purification tower body by virtue of the difference in position. During the installation of sieve plate or filter element, directly pass through the circular limiting ring and multiple vertical guide grooves for clamping connection, to avoid the loosening of the connection between sieve plate and vertical guide groove due to repeated flushing of liquid during use.

The invention discloses a method for efficiently separating manganese, iron and aluminum in manganese oxide leachate step by step and efficiently recovering manganese, iron and aluminum, which comprises the following steps: by taking manganese dioxide and manganese slag leachate as a raw material, adjusting the acidity pH of the solution to be 1-2, adsorbing and removing iron ions by using resin, then adjusting the pH of the solution to be 2-4, and adsorbing and removing aluminum by using resin. And finally, extracting and separating to obtain a manganese-containing solution. Iron and aluminum on the chelate resin can be desorbed by hydrochloric acid, and the resin can be recycled. According to the method, manganese, iron and aluminum in the manganese oxide residue leaching solution are effectively separated and recycled through combination of ion exchange and an extraction method, manganese ions are selectively separated from the solution, separation of manganese from impurity elements such as aluminum and iron is achieved, the content of the impurity elements such as iron and aluminum in the manganese solution is reduced, damage of a traditional precipitation method to manganese is avoided, and the method is suitable for industrial production. The purity of manganese is integrally improved, and technical support is provided for preparation of high-purity manganese. Meanwhile, iron and aluminum elements in the solution can be effectively recycled.

The invention relates to the field of electroplating sludge, and particularly discloses a selective separation and resource recycling method for copper in electroplating sludge. The method comprises the following steps: mixing and roasting electroplating sludge and sodium salt, and washing with water to obtain filter residues; then carrying out acid leaching on the filter residues to obtain an acid leaching solution containing iron, copper, nickel and zinc; then enabling the pickle liquor to sequentially pass through a first ion exchange column filled with monophosphate group chelating resin and a second ion exchange column filled with copper selective functionalized resin to selectively adsorb iron ions and copper ions respectively; then desorbing the resin adsorbing the copper by using an acid solution to obtain a copper-containing eluent; and finally, carrying out evaporation concentration and recrystallization treatment to obtain a high-purity copper salt product. According to the method, the separation selectivity and the recovery efficiency of copper in the electroplating sludge are fundamentally improved by adopting a chelating resin combination with specific functional groups and an optimized acid leaching-adsorption series process.

The invention discloses an electroplating sludge iron resource recovery method based on acid leaching-resin selective adsorption, and relates to the field of dangerous solid waste resource treatment.The electroplating sludge iron resource recovery method comprises the following steps that S1, collected electroplating sludge and sodium salt are evenly mixed, roasted, cooled, washed and filtered, and washing liquid and filter residues are obtained; s2, adding water into the filter residues obtained in the S1, uniformly mixing, then mixing with an acid solution, carrying out an acid leaching reaction, and carrying out solid-liquid separation to obtain an acid leaching solution; according to the electroplating sludge iron resource recycling method based on acid leaching-resin selective adsorption, selected specific chelating resin is large in iron ion adsorption capacity and excellent in selectivity under the low pH, competitive interference of coexisting ions such as Cu < 2 + > can be effectively overcome, and the iron recycling rate can reach 99% or above; the adsorption step is carried out under the strong acidic condition and is matched with the characteristics of the electroplating sludge pickle liquor, the pH does not need to be greatly adjusted, the process is simplified, and the cost is reduced.

The invention discloses a treatment method of electroplating wastewater, and belongs to the technical field of electroplating wastewater treatment. The process comprises the following steps: electrically adjusting the pH value of the electroplating wastewater to 2.5-4.0, adding ferrite, adopting a Ti / PbO2 anode and a graphite cathode, controlling the current density to 15-30mA / cm, introducing air, reacting for 40-80 minutes, and adjusting the pH value to 6.0-7.0 after the reaction; introducing the wastewater into a chelating resin column, wherein the chelating resin is an amino phosphonic acid type or iminodiacetic acid type; the method comprises the following steps of: introducing into a built-in filter column, loading two layers of recrystallized silicon carbide honeycomb ceramic membranes in the filter column in parallel, performing cross-flow filtration under the conditions that the operation pressure is 0.8-2.0 MPa, the temperature is 25-40 DEG C and the cross-flow velocity is 1.5-3m / s, and collecting permeate; the permeate liquid is used for backwashing every 8-12 hours of operation. According to the method, heavy metal ions in the electroplating wastewater can be effectively removed, and the treatment efficiency of the electroplating wastewater is improved.

The invention discloses preparation of phenolic chelating resin and application of the phenolic chelating resin in deep defluorination, belongs to the field of water treatment adsorption materials, and particularly relates to a resin adsorbent with a phenolic polycondensation framework, an amino phosphonic acid chelating functional group and a metal coordination center. The structural unit of the resin adsorbent is shown in the figure. The phenolic chelate resin is suitable for a deep fluorine removal process with complex wastewater components, and specific adsorption of F <-> is achieved by loading metal cations (M) such as aluminum, iron, zirconium, lanthanum and cerium. The phenolic chelate resin provided by the invention has a highly hydrophilic skeleton and a uniform mesoporous structure (2-50nm), has good dynamic performance, low affinity to organic matters, strong anti-pollution ability, high adsorption capacity and F-selectivity, and can effectively improve the process operation efficiency and reduce the resin regeneration cost.

Provided is a technology for more effectively adsorbing scandium by suppressing the amount of chromium adsorbed onto a chelate resin in an ion exchange treatment of an acidic solution containing scandium and impurities including chromium using the chelate resin.　The present invention comprises an ion exchange treatment step for passing an acidic solution containing scandium and impurities including chromium through a column filled with an iminodiacetic acid-type chelate resin to adsorb the scandium onto the chelate resin, wherein, in the ion exchange treatment step, the acidic solution is passed in the range of 40-70ºC, and when the amount of the scandium adsorbed onto the chelate resin is qSc and the maximum amount of the scandium adsorbed onto the chelate resin is qmax,Sc, the passed liquid amount BV in which qSc / qmax,Sc is 0.5 is defined as a lower limit value and the value of the passed liquid amount BV in which the apparent separation factor αapp,Cr(III) Sc(III), defined by the relationship between the scandium and the chromium contained in the acidic solution, is 1 is defined as an upper limit value, and the passed liquid amount BV of the acidic solution is set in the range of the lower limit value to the upper limit value.

The invention relates to a preparation method of a drug intermediate 2-amino-3-hydroxypyridine, and relates to the technical field of medicines. Adding water, acid, sodium chloride, furfural and a sulfamate solution into the reaction kettle, and stirring for reaction; after the reaction is finished, carrying out centrifugal separation to obtain 2-imino-3-hydroxypyridine sulfonic acid; the preparation method comprises the following steps: adding water and 2-imino-3-hydroxypyridine sulfonic acid into a reaction kettle, heating and stirring to react, adding modified amino phosphonic acid type chelating resin, stirring and adsorbing, adjusting the pH value to 6-8 by using an inorganic alkali solution, centrifuging and drying to obtain 2-amino-3-hydroxypyridine; the modified amino phosphonic acid type chelating resin is prepared from amino phosphonic acid type chelating resin, 10 # white oil, aluminum chloride and 5-quinoline sulfonyl chloride. According to the method, the 2-amino-3-hydroxypyridine with higher yield and purity can be obtained, and the method has a good industrial application prospect.

The invention provides a purification method of a naphthalimide high-purity electronic-grade photoacid generator. The method solves the problem that photo-acid cannot be purified by traditional recrystallization or directly through ion exchange columns and other methods. The method comprises the following steps: firstly synthesizing and preparing 1, 3-diketone-2-hydroxy-6-(1-hexyne) benzisoquinoline, then reacting with triethylamine and trifluoromethylsulfonyl chloride to generate a crude product 1, 3-diketone-2-(1, 1, 1-trifluoromethyl) methanesulfonic ester-6-(1-hexyne) benzisoquinoline, removing impurities from normal hexane to obtain a pure product, sublimating the material into a gas phase by using a quartz vacuum sublimation instrument, and purifying to obtain the 1, 3-diketone-2-(1, 1, 1-trifluoromethyl) methanesulfonic ester-6-(1-hexyne) benzisoquinoline. And then passing through Pure MTS9500 amino phosphonic acid type chelating resin, and finally cooling in a quartz tube to obtain the high-purity electronic-grade photoacid generator. According to the invention, the stability is high, the metal ion content is low, the purification process is convenient to process, the product is used as a photoresist-level core main material, the product is widely applied in the fields of semiconductor photoresist, other imaging systems, photocureable coatings and the like, the market scale is continuously expanded, and the product is an indispensable key material in semiconductor manufacturing and other related fields.

In the manufacture of printed circuit boards using a semi-additive process, a used removal solution for removing a nickel-chromium-containing layer (5) is brought into contact with a chelate resin having a functional group represented by the following formula (1) for regeneration. In formula (1), a plurality of Rs are identical divalent hydrocarbon groups having 1 to 5 carbon atoms, and a portion of the hydrogen atoms may be substituted with halogen atoms. [Chemical Formula 1]

The application relates to a pyrone-based chelating resin, a preparation method thereof and a method for removing impurities. The main chain skeleton of the pyrone-based chelating resin is a styrene-based adsorption resin, and at least one pyrone functional group is branched on the side chain. The multi-oxygen structure of the pyrone functional group and the nitrogen atom on the main chain skeleton can produce strong coordination with aluminum ions, and a stable six-membered ring chelate is formed through a chelation reaction, thereby showing excellent selective aluminum removal performance. Meanwhile, the pyrone functional group has acid-base properties, can undergo ion exchange reaction or physical adsorption with organic matters, and thus can effectively remove TOC in a water environment. Therefore, by using the pyrone-based chelating resin provided in the application, the aluminum ions and TOC in a rare earth solution can be efficiently removed through the synergistic cooperation of the multi-oxygen coordination effect and the selective ion exchange capacity, and the loss rate of the rare earth ions is obviously reduced.

This invention discloses a method for deep removal of calcium and magnesium from battery-grade manganese sulfate solution, belonging to the field of hydrometallurgical technology. The invention employs a three-stage purification process: pretreatment for impurity removal, gradient precipitation with manganese fluoride, selective extraction, and chelating resin refinement. First, the manganese sulfate leachate undergoes pretreatment to remove iron, aluminum, and heavy metals. Then, an in-situ / direct addition of manganese fluoride precipitation system using magnesium fluoride seeding and gradient fluoride supplementation efficiently removes most calcium and magnesium impurities from the solution, achieving a single-precipitation rate of over 93% for magnesium ions. Subsequently, a P507 / Cyanex272 / TBP compound saponification organic system is used with a reverse extraction logic of "extracting calcium and magnesium while retaining manganese in the aqueous phase" to precisely remove residual calcium and magnesium, avoiding the problems of competition between manganese and calcium and low magnesium extraction efficiency in traditional extraction methods. Finally, trace amounts of calcium, magnesium, and residual fluoride ions are completely removed through aluminum salt complexation for fluoride removal combined with deep refinement using aminocarboxylic acid chelating resin. This invention introduces no foreign impurities such as sodium and ammonium throughout the entire process, has a wide process window and strong industrial stability, and the final purified manganese sulfate solution can stably meet the high-end battery-grade index requirements of Ca²⁺≤5mg / l, Mg²⁺≤5mg / l, and F⁻≤1mg / l, making it suitable for the large-scale production of high-purity manganese sulfate, a raw material for lithium battery cathodes.

The utility model discloses a hydrochloric acid double -layer filter equipment, including primary filter casing, the support frame is fixedly connected on the primary filter casing outer wall, the support frame is fixedly connected with the secondary filter casing below primary filter casing, the lower portion of secondary filter casing top is linked together with the primary filter casing through a pipeline, the lower portion of secondary filter casing is linked together with the drain pipe, the end of drain pipe is equipped with drain valve no.

The application discloses a kind of composite resin for removing metal ions and its preparation method and application, belong to resin material technical field.The application provides a kind of composite resin with weak acid cation functional group and nitrogen-containing chelating functional group for overcoming the problem that the removal rate of heavy metal in the solution with alkali metal and heavy metal simultaneously is poor in traditional cation exchange resin.The composite resin in the application contains nitrogen-containing oxygen chelating functional group and weak acid cation functional group, nitrogen-containing oxygen chelating functional group can selectively remove heavy metal ions such as chromium, and weak acid cation functional group can effectively remove alkali metal ions such as calcium, so that the composite resin in the application has the advantages of both cation exchange resin and chelating resin, which can effectively remove heavy metal ions and alkali metal ions in ethanolamine stock solution.The metal ion concentration in ethanolamine solution treated by the composite resin in the application is less than 30 ppb.

This invention relates to the field of high-purity material analysis technology, and discloses a method for simultaneously separating and enriching copper, cadmium, nickel, cobalt, zinc, lead, and barium in lithium carbonate. The steps are as follows: dissolving a lithium carbonate sample in nitric acid to obtain an acidified sample solution; adjusting the acidified sample solution to an alkaline pH range of 9.5-10.5 using an ammonia-ammonium acetate alkaline buffer solution; passing the alkaline solution through a solid-phase extraction column filled with iminodiacetic acid-type chelating resin, where copper, cadmium, nickel, cobalt, zinc, lead, and barium ions are selectively adsorbed onto the resin; and eluting the adsorbed heavy metal ions with acid to achieve separation and enrichment. This invention effectively overcomes the inhibition and interference of the lithium carbonate matrix on the detection of trace heavy metals, and in particular significantly improves the adsorption and recovery rate of elements such as barium. It achieves efficient separation and enrichment of multiple heavy metals in complex matrices, providing a reliable pretreatment solution for high-sensitivity and high-accuracy quality control analysis of lithium carbonate products.

The application provides a purification method of lithium fluoride, high-purity lithium fluoride, lithium hexafluorophosphate, an electrolyte and a device, and the purification method of the lithium fluoride comprises the following steps: performing water washing treatment on the lithium fluoride to be purified at 0-50 DEG C to obtain a mixture containing a first solid-phase product; performing ultrasonic treatment on the mixture at 20-25 kHz to obtain a second solid-phase product through filtration; performing fluorination reaction on the second solid-phase product with electronic-grade anhydrous hydrofluoric acid to obtain a third liquid-phase product; performing ion exchange on the third liquid-phase product by using a chelating resin at 0-80 DEG C, and then performing cooling evaporation crystallization, and obtaining a fourth solid-phase product through filtration; and performing cleaning treatment on the fourth solid-phase product by using inert gas at 150-250 DEG C to obtain high-purity lithium fluoride. The high-purity lithium fluoride obtained by the purification method has low content of lithium carbonate and other impurities, and is beneficial to improving the performance and stability of subsequent products.

The invention relates to the technical field of alloy recovery, and particularly discloses an innovative energy-saving method for waste circuit board regenerated copper and alloy product extraction, and the method comprises the following steps: S1, catalytic desoldering; s2, gradient separation: carrying out two-stage vortex separation and vibration screening on the desoldered material; s3, pulsating electrolysis is conducted, specifically, the separated copper concentrate serves as an anode, and periodic pulsating direct current is applied to a composite electrolyte; s4, membrane separation and refining: separating the electrolyte through a hollow fiber membrane module with the molecular weight cutoff of 500Da, performing electrodeposition on copper-rich liquid to obtain cathode copper, and performing pH gradient precipitation on permeate liquid to recover tin-lead alloy; and S5, precious metal recovery: carrying out microwave-assisted leaching treatment on the electrolytic residues, enriching the precious metal in the leachate through chelate resin, and repeating the step S4, so that the effects of reducing the comprehensive energy consumption of per ton of copper, and improving the purity of cathode copper and the recovery rate of tin-lead alloy are achieved.

The invention belongs to the technical field of integrated circuit materials, and particularly relates to mixed resin for deeply removing metal impurities in a photoresist solution and a method thereof. The mixed resin comprises chelating resin, modified resin and macroporous adsorption resin. The method disclosed by the invention comprises the step of enabling a photoresist solution to pass through the PFA column filled with the mixed resin disclosed by the invention. The metal impurities of the photoresist solution purified by the mixed resin can be less than or equal to 15ppb, and the purified photoresist solution is neutral. The mixed resin and the method disclosed by the invention are particularly suitable for treating a photoresist solution with acid-unstable components, and have wide application prospects and good economic benefits in the field of integrated circuit materials.

This invention provides a method for recovering and preparing ferric phosphate from ferric phosphorus slag. The method includes the following steps: leaching the ferric phosphorus slag with phosphoric acid, separating the solid and liquid phases to obtain a leachate; mixing iron powder with the leachate to perform a copper removal reaction, obtaining a copper-removed liquid; using a chelating resin to adsorb aluminum from the copper-removed liquid, obtaining an aluminum-removed liquid; subjecting the aluminum-removed liquid to oxidation and crystallization to obtain ferric phosphate slurry; and after solid-liquid separation, washing, and drying, obtaining orthorhombic ferric phosphate and mother liquor; the oxidant used in the oxidation is hydrogen peroxide. The method for recovering and preparing ferric phosphate from ferric phosphorus slag provided by this invention uses only phosphoric acid as the leaching agent and pH buffer system. The synthesis process relies on the self-buffering properties of phosphate-dihydrogen phosphate to regulate the crystallization reaction, completely avoiding the auxiliary material consumption caused by acid-base neutralization in traditional wet processes; it also has lower costs and yields orthorhombic ferric phosphate with higher purity, meeting the requirements for battery applications.

The present invention provides a technology that suppresses the amount of chromium adsorbed onto a chelate resin during ion exchange treatment performed on an acidic solution containing scandium and chromium using the chelate resin, thereby achieving more effective adsorption of scandium.　The present invention includes an ion exchange treatment step in which an acidic solution that contains scandium and impurities including chromium is passed through a column filled with an iminodiacetic acid type chelate resin so as to cause scandium to be adsorbed onto the chelate resin. In the ion exchange treatment step, the acidic solution is passed at a temperature in the range of 15°C to 45°C. When the adsorption amount of scandium onto the chelate resin is qSc and the maximum adsorption amount of scandium onto the chelate resin is qmax, Sc, the passed amount BV of the acidic solution at which qSc / qmax, Sc = 0.5 is defined as a lower limit value, and the passed amount BV of the acidic solution at which the maximum adsorption amount of scandium onto the chelate resin, i.e., qmax, Sc, is achieved is defined as an upper limit value, and the passed amount BV of the acidic solution is set within a range between the lower limit value and the upper limit value.

The invention discloses a preparation method of electronic-grade tris (hydroxymethyl) aminomethane, which comprises the following steps: tris (hydroxymethyl) aminomethane is prepared into an aqueous solution, the aqueous solution passes through a chromatographic column, the filler of the chromatographic column is chelate resin or cation exchange resin, and the chelate resin or cation exchange resin is subjected to transformation pretreatment by using ammonia water before being filled; the obtained tris (hydroxymethyl) aminomethane solution is subjected to circulating filtration through a three-stage membrane module filtration system; adding a chelating agent to carry out chelating concentration treatment, and then concentrating to remove part of water; carrying out gradient cooling crystallization on the sample; and sequentially centrifuging and drying the cooled and crystallized trihydroxymethyl aminomethane solution to obtain the electronic-grade trihydroxymethyl aminomethane. The metal ion content of the finally obtained trihydroxymethyl aminomethane is 10 ppb or below, after further treatment, the metal ion content can be controlled to 1 ppb or below, operation is easy, and industrial production is facilitated.

This invention discloses a softening treatment device and method for high-temperature oilfield wastewater, relating to the field of wastewater treatment technology. Oilfield wastewater enters a pre-desorption tank for impurity removal. The barium-strontium adsorption tank contains, from top to bottom, a fine quartz sand layer, a chelating resin layer, and a coarse quartz sand layer. The silicate pre-desorption tank contains an acid-base regulator, a dispersant, and a magnesium oxide suspension. The carbonate softening tank contains a dispersant, a coagulant aid, a soda ash solution, and a chelating agent. The stabilizing tank contains, from top to bottom, a modified activated carbon layer and an exchange resin layer. This invention uses the pre-desorption tank to initially separate oil, suspended solids, and corrosion products. A specialized chelating resin selectively adsorbs barium-strontium ions. In the silicate pre-desorption tank, pH is precisely controlled and magnesium oxide is added to directionally generate settleable magnesium silicate flocs. In the carbonate softening tank, crystal form control and coagulation aid work synergistically to promote the precipitation of calcium and magnesium in the form of large calcite particles.

The present application relates to the technical field of phosphoric acid production, and particularly relates to a method and device for purifying and preparing electronic-grade phosphoric acid by using microwave temperature control technology. The method comprises the following steps: S1, using a composite impurity removal agent to perform chemical precipitation pretreatment on industrial-grade wet-process phosphoric acid, and adjusting the concentration after solid-liquid separation; S2, performing microwave temperature control concentration on the pretreated liquid at a vacuum degree of 0.085-0.095 MPa and a temperature of 160-220 DEG C to obtain a concentrated liquid with P2O5 of 85% or more; S3, performing crystallization, sweating and chelating resin ion exchange deep impurity removal on the concentrated liquid; and S4, performing decolorization, super-clean filtration and dilution and filling to obtain electronic-grade phosphoric acid finished products. The present application also provides a special device. The present application is coupled by microwave concentration and multi-stage deep impurity removal, the concentration efficiency is improved by 30%-50%, the energy consumption is reduced by more than 30%, the finished product metal impurity is less than or equal to 10 ppb, and the finished product meets the GB / T1282-2011 standard; the device adopts high-purity PTFE anticorrosion lining to avoid secondary pollution and is suitable for large-scale industrial production.

A metal-chelating resin includes (a) a compound represented by Formula (I):or a stereoisomeric form thereof or a salt thereof, wherein R1, R2, R3, R4, Ra, Rb, Rc and Rd are as defined herein; and (b) an organic polymer resin having at least one complementary reactive functional group covalently linked with at least one linking group of the compound represented by Formula (I).

The invention discloses a preparation method of monodisperse high-crystallization copper powder, and belongs to the technical field of metal powder preparation. The method is used for solving the technical problem of how to regulate and control the process of synthesizing cuprous oxide powder and copper powder so as to improve the dispersity and crystallinity of the synthesized copper powder when the copper powder is synthesized in the prior art. A preparation method of monodisperse high-crystallization copper powder comprises the following steps that cuprous oxide powder is added into deionized water to be evenly mixed, and a cuprous oxide mixture is obtained; ascorbic acid and chelating resin are added into deionized water, and complexing liquid is prepared; and blending the cuprous oxide mixture and the complexing solution, then carrying out heating reaction, and filtering to obtain copper powder particles. Wherein the cuprous oxide powder is prepared by reaction of copper nitrate, gelatin and hexadecyl trimethyl ammonium bromide. Through adsorption of the template agent and the chelate resin, the copper powder which is regular in morphology, high in crystallinity and uniform in dispersion is prepared.

The invention relates to the technical field of electrolytic manganese, in particular to a method for increasing the manganese electrolysis yield. The method comprises the following steps: filtering a manganese sulfate and ammonium sulfate composite solution, and then adjusting the pH value to obtain a purified solution; the filtering treatment comprises chelating resin filtering and / or precise filter element filtering; the purified liquid is subjected to electrolytic deposition under the first cathode pulse average current density, the second cathode pulse average current density and the third cathode pulse average current density in sequence, and electrolytic manganese metal is obtained; the average current density of the first cathode pulse and the average current density of the third cathode pulse are 50-70 A / m < 2 > lower than the average current density of the second cathode pulse; and the electrolytic manganese metal is passivated and dried. The method provided by the invention can effectively inhibit cathode manganese from flaking, and has the advantages of remarkably improving the product yield and the like.

The invention discloses a process for removing calcium ions and magnesium ions from nitrate-containing quaternary system brine, and relates to the technical field of brine treatment. The method comprises the following steps: filling a single column with modified composite resin, enabling the nitrate-containing quaternary system brine to pass through the column, and collecting outlet liquid to obtain the calcium ion and magnesium ion removed nitrate-containing quaternary system brine. Wherein the modified composite resin is prepared by the following steps: pretreating phosphoramidate chelate resin with dopamine, compounding the pretreated phosphoramidate chelate resin with nano-crystalline cellulose, a synergist and functionalized carbon quantum dots, cross-linking with a silane coupling agent KH560, and finally soaking with acid and alkali and purifying. The nano cellulose, the synergist, the functionalized carbon quantum dots and the like are introduced, and a specific process method is matched, so that the calcium and magnesium adsorption capacity, the permeation wear impact force resistance, the pollution resistance and the lithium loss resistance of the treatment process are effectively improved. Therefore, the treatment process disclosed by the invention has a wider application prospect.

This application discloses a method for preparing electronic-grade sodium fluoride from polyetheretherketone (PEEK) cleaning water, belonging to the field of chemical synthesis technology. The method uses cleaning water generated during PEEK production as raw material. After distillation to remove organic solvents, the water is neutralized with hydrogen fluoride, purified by adsorption with activated carbon and chelating resin, and concentrated and crystallized to obtain crude sodium fluoride. This crude sodium fluoride is then pulped with solvent and dried to obtain the finished electronic-grade sodium fluoride. This application effectively solves the problem of resource utilization of fluoride-containing wastewater in the PEEK manufacturing industry, realizing "turning waste into treasure," promoting the development of a green circular economy in the PEEK industry, and providing high-quality and inexpensive electronic-grade sodium fluoride raw material for the sodium-ion battery industry.