19results about How to "Low ion content" patented technology

The invention relates to the technical field of discharged water recycling, and discloses a discharged water recycling device based on an RO concentrated water system, which comprises a buffer tank, the buffer tank is connected with an ultrafiltration device, the ultrafiltration device is connected with a precision filter, the precision filter is connected with an RO device, the RO device is connected with a nanofiltration device, and the RO device is connected with a product water tank. The concentrated water is filtered by the RO device and then is divided into two paths of produced water, one path is recycled water, the recycled water enters a product water tank after the produced water conductivity and the produced water flow are detected, and the other path is re-concentrated water, and the re-concentrated water enters the nanofiltration device after pressure detection. Excess pressure of the concentrated water RO device is utilized to enter the nanofiltration device, nanofiltration is not provided with a booster pump, energy conservation and consumption reduction are achieved, the structure is simple and reasonable, the nanofiltration device is independent of original main system equipment, normal operation of the main equipment is not affected when the equipment breaks down or stops running, the water treatment capacity of a preceding-stage device can be reduced, waste water discharge is reduced, and the energy utilization rate is increased. The consumption of tap water in the water production process is reduced.

The invention relates to a method for producing industrial-grade phosphoric acid from wet-process phosphoric acid raffinate acid, and belongs to the technical field of wet-process phosphoric acid. The technical problem to be solved by the invention is to provide a low-cost method for producing industrial-grade phosphoric acid from wet-process phosphoric acid raffinate. The method comprises the steps of pretreatment, metal ion extraction, pretreatment, phosphoric acid extraction, washing, phosphoric acid reverse extraction, concentration and the like, and finally industrial-grade phosphoric acid is obtained. The method adopts the raffinate acid as the raw material to prepare the industrial grade phosphoric acid, perfects and improves the wet-process phosphoric acid purification process, can utilize the original production equipment of a phosphorus purification enterprise, does not need to add new equipment, and is low in production cost. According to the method, phosphoric acid loss is avoided, all extracting agents can be recycled, associated metal elements in the raffinate acid can be recycled in a cascade classification mode, and cost is saved. The method is high in extraction efficiency, the content of metal impurity ions in the obtained product phosphoric acid is low, and the requirement of industrial grade phosphoric acid is met.

The embodiment of the invention provides a preparation method of ultra-pure tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin. The preparation method comprises the following steps: carrying out devolatilization on tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer by using liquid or supercritical fluid; carrying out end group passivation on the devolatilized tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer under a swelling condition, and removing a passivation medium; and washing, dehydrating and drying the passivated tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, and then removing magnetic particle impurities to obtain the ultra-pure tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin, so that the problems that unstable end groups are easily generated in the preparation process, fluorine ions are difficult to dissolve out and the like are solved; and the stability and the product quality of the prepared product are improved.

The present invention belongs to the technical field of polyether polyol synthesis, and specifically relates to a polyether polyol for low hysteresis loss polyurethane foam tire and a continuous preparation method thereof. The polyether polyol uses a 6-functionality small molecule alcohol as an initiator, a phosphazene catalyst or a phosphazene and an alkali metal catalyst mixed catalyst for catalytic reaction, and adopts a continuous preparation method, with a short production cycle and high yield. The prepared polyether polyol has the characteristics of high functionality, high molecular weight, low unsaturation, narrow molecular weight distribution, etc., and can be used in the preparation of polyurethane foam tires to reduce the compression permanent deformation of the material, reduce endogenous heat, and improve resilience, thereby solving the industry bottleneck problem that the foam tire cannot rebound or rebounds slowly after being loaded.

The invention discloses a chemical industrial park organic wastewater treatment process, which belongs to the technical field of wastewater treatment, and comprises the following steps: adjusting the pH value of pretreated wastewater to 3-4, pumping the wastewater into a Fenton reaction tank, adding H2O2 and an iron-based Fenton reagent into the Fenton reaction tank, staying for 0.5-1.2 h under the illumination condition, then introducing the effluent of the Fenton reaction tank into a degassing neutralization tank, stirring to remove oxygen generated by the Fenton reaction, conveying the oxygen to a second regulating tank through a water pump, regulating the pH value to 7-8, adding a precipitator, stirring for 30 minutes, standing and precipitating for 2-4 hours, and separating out supernate; and carrying out ultrafiltration on the supernate. The organic pollutants and heavy metal pollutants in the organic wastewater in the chemical industrial park are effectively removed through the combined process of pretreatment, Fenton oxidation, coagulating sedimentation and ultrafiltration, the effluent meets the pollutant discharge standard of a municipal sewage treatment plant, and the COD removal rate is 96% or above.

The invention discloses composite basic manganese chloride as well as a preparation method and application thereof, and belongs to the technical field of preparation of inorganic chemical products. The raw materials used in the preparation method are wide in source and lower in price, and the production process is simple in step and high in yield, so that the production cost is low; in addition, the preparation method provided by the invention comprises an impurity removal step, the content of harmful ions in the finally obtained basic manganese chloride product is extremely low, and adverse effects on animals and plants are not generated after the basic manganese chloride product is used; a nucleating agent and a surfactant are introduced in the preparation process, so that the product with a narrow and uniform particle size distribution range can be obtained, specific nutritional ingredients can be introduced into the product, and meanwhile, high-valence manganese ingredients can be prevented from being generated in the drying process, so that the obtained product is more easily absorbed and utilized by animals and plants; therefore, the obtained product can be better used as feed or plant fertilizer.

The invention discloses battery-grade lithium carbonate as well as a preparation method and application thereof, and the preparation method comprises the following steps: synchronously introducing a lithium-containing solution and carbon dioxide bubble water into a reaction device, and reacting to obtain lithium carbonate; the carbon dioxide bubble water is prepared by adopting the following method: simultaneously introducing carbon dioxide and water into a shear pump, and shearing and mixing to prepare the carbon dioxide bubble water. According to the method, the traditional gas-liquid reaction that carbon dioxide is directly introduced into the lithium-containing solution is creatively transformed into a gas-liquid-liquid reaction system that carbon dioxide bubble water prepared in advance and the lithium-containing solution are synchronously introduced, so that the product purity and stability are remarkably improved, and the bottleneck of a traditional intermittent process is broken through; the preparation method is simple, the production capacity and efficiency are remarkably improved, industrial large-scale production is easy to realize, and the obtained product lithium carbonate crystal is complete in growth, concentrated and controllable in particle size distribution and regular in morphology, and meets the processing requirements of high-end battery materials.

The invention discloses a method for purifying lithium diallyl malonate borate, which comprises the following steps of: 1, adding a first mixed solvent which comprises a high-polarity organic solvent and a low-polarity organic solvent in a mass ratio of (1: 1)-(1: 5) into lithium diallyl malonate borate crude salt, heating, stirring, dissolving and filtering to remove organic impurity filtrate; 2, the filter cake is subjected to vacuum drying and then ground into fine powder, a second mixed solvent is added, cooling and stirring are conducted, the second mixed solvent comprises a high-polarity organic solvent and a low-polarity organic solvent, and the mass ratio of the high-polarity organic solvent to the low-polarity organic solvent is 9: 1-3: 1; filtering while cold to remove insoluble impurity salt; and 3, concentrating the filtrate into particles, grinding the particles into fine powder, and transferring the fine powder to a vacuum drying oven for drying to obtain a lithium bis (malonate) borate finished product. The method has the advantages that the product purity is high, the metal ion content is low, the operation steps are simple, the purification cost is low, and the use requirements of the electrolyte additive are met.

The present invention relates to a silicon dioxide filler for chip-level bottom filling glue and a preparation method and application thereof. The preparation method comprises the following steps: mixing a cosolvent solution with a silicon source compound to obtain a solution A; mixing a catalyst aqueous solution with the obtained solution A to obtain a suspension; solid-liquid separation of the obtained suspension, drying to obtain a powder A; calcining the obtained powder A to obtain the chip-level SiO2 filler. The chip-level silicon dioxide filler prepared by the preparation method of the present invention has high purity, high sphericity, low impurity ion content, and a particle size distribution that meets the requirements of flip chip packaging. In addition, by regulating the ratio of the cosolvent, the catalyst and the silicon source compound, the average particle size and the cut-off point of the prepared silicon dioxide can be controlled, without the need for subsequent classification, screening and grading process operations.

The invention belongs to the technical field of purification of electronic chemicals, and particularly relates to a method for coupling and purifying electronic-grade N-methyl pyrrolidone (NMP). The method comprises the following steps: (1) introducing industrial-grade N-methyl pyrrolidone into a batch rectifying tower; (2) introducing the tower kettle produced liquid into a resin adsorption tower at a certain flow rate; (3) introducing the discharged material of the resin adsorption tower into a dehydrating tower; (4) introducing the material discharged from the dehydrating tower into a sub-boiling distillation tower; and (5) collecting the discharged material, and carrying out membrane filtration to obtain the electronic-grade N-methyl pyrrolidone. The method provided by the invention is flexible to operate, low in energy consumption, short in flow and good in purification effect, the ion exchange resin and the molecular sieve can be regenerated and reused, and more than or equal to 99.99% of G4-grade N-methyl pyrrolidone can be obtained.

The invention discloses a multi-component doped ultralow-loss optical fiber and a preparation method thereof. The optical fiber comprises a fiber core layer, a secondary core layer, a gradient control layer, a nonlinear functional layer, an absorption layer, an isolation layer, a thermal stability layer, a supporting layer, a transition protection layer and an outer cladding which are arranged from inside to outside. According to the optical fiber, the 1550nm wave band attenuation is reduced to 0.145 dB / km, and ultralow loss is realized; the diameter of a mode field reaches 11-16 [mu] m, and mode interference is effectively reduced; the optical fiber supports communication of S + C + L wave bands of 1300-1625 nm, when 100 circles of looping with the radius of 60 mm are carried out, the maximum additional attenuation at the position of 1550 nm does not exceed 0.01 dB, and the optical fiber is suitable for long-distance communication; the environment adaptability of the optical fiber is high, the stability of the optical fiber in high-temperature, high-humidity and strong-mechanical-stress environments is enhanced by arranging the thermal stability layer and the supporting layer and combining the zirconium doping design of the outer cladding, and the optical fiber is particularly suitable for submarine optical cables and high-reliability backbone networks.

The utility model discloses a cathode material pre-carbonization flue gas cooling and pre-desulfurization system, and belongs to the field of flue gas spraying and impurity removal. The device comprises a spray cooling tower, the lower part of the spray cooling tower is provided with a gas inlet for pre-carbonized flue gas to enter, the upper part of the spray cooling tower is provided with a liquid inlet which is communicated with RO concentrated water through a pipeline, and the pipeline is provided with an upper-section spray pump and a spray electric valve, so that the RO concentrated water enters a spray pipeline inside the spray cooling tower; a tower breaking plate is arranged between the lower gas inlet and the upper liquid inlet in the spray cooling tower, and the pre-carbonized flue gas enters the lower area of the spray cooling tower through the lower gas inlet, then penetrates through the tower breaking plate, enters the upper area of the spray cooling tower and is subjected to spray treatment by a spray liquid with RO concentrated water. The device disclosed by the utility model can simultaneously remove SO2 in flue gas generated in a pre-carbonization process and calcium ions in secondary RO concentrated water of the clean sewage recycling device, and can not add alkaline substances any more, so that the ion content in the water is reduced while the material consumption is reduced.

The invention relates to the technical field of hydrometallurgy, and discloses a method for preparing a low-impurity manganese sulfate solution by taking manganese oxide ore as a raw material, which comprises the following steps of: ball-milling the manganese oxide ore into powder, adding the manganese oxide ore powder into a dilute sulfuric acid aqueous solution, soaking and pickling at normal temperature, carrying out solid-liquid separation, and mixing the pickled manganese oxide ore powder with hydrated slurry to obtain a mixture; and adding the slurry into a reaction kettle, stirring, heating the slurry to 60-80 DEG C, introducing copper smelting tail gas, reacting and leaching, adding a proper amount of reduced manganese powder (MnO) and BaS into the leached slurry, and filtering to remove slag, thereby obtaining the low-impurity manganese sulfate solution. After the manganese oxide ore is subjected to ball milling, acid pickling and slurrying, the copper smelting sulfur dioxide tail gas is introduced for reduction leaching, the manganese sulfate solution containing extremely low impurity element ions such as K <->, Na < + >, Ca < 2 + > and Mg < 2 + > is prepared, the total manganese leaching rate of the manganese oxide ore is high, the process flow is short, and the production efficiency is high.

The present application belongs to the technical field of polyol detection, and particularly relates to a detection method for judging the metal ion content of polyol based on conductivity, comprising the following steps: S100, respectively preparing an ethanol aqueous solution and a polyol mixed solution with known metal ion content to be detected; S200, adding the polyol mixed solution with known metal ion content to be detected into the ethanol aqueous solution successively, determining the conductivity value of the ethanol aqueous solution after adding the polyol mixed solution each time, and calculating the conductivity difference of the polyol mixed solution before and after dilution; S300, performing standard curve fitting according to the polyol mixed solution with step concentration and the corresponding conductivity difference, and obtaining a fitting equation; S400, substituting the conductivity difference of the polyol sample determined in the step S200 into the fitting equation obtained in the step S300, and calculating the metal ion content to be detected of the polyol sample. The present application can effectively reduce the test cost and improve the test efficiency.

The application discloses a device for reducing the electric conductivity of cooling water of an SVC system TCR valve group, and relates to the technical field of cooling systems.The device comprises a high-level water tank and a deionization tank; the water outlet end of the high-level water tank is connected with the water inlet end of the SVC valve group through a pipeline; the water outlet end of the SVC valve group is connected with the water return end of the high-level water tank through a pipeline; and the deionization tank is arranged on the pipeline between the high-level water tank and the SVC valve group. The deionization tank is arranged in the circulating pipeline between the high-level water tank and the SVC valve group, the ion content in the cooling water system is significantly reduced through the deionization tank, the personnel maintenance cost is reduced, and the stable operation of the SVC system is ensured.

The present application relates to a kind of pharmaceutical composition for treating constipation and its preparation method and use, and the pharmaceutical composition is made of senna 80%, angelica 10%, cistanche 10%.In the present application, cistanche is treated by using extraction, adsorption and other extraction methods, to reduce the content of metal toxic substances, and avoid the poisoning reaction that appears in long-term use.

The invention relates to the technical field of iron phosphate production, and discloses a battery-grade iron phosphate production method based on raffinate acid and a preparation method of lithium iron phosphate thereof, and the method comprises the following steps: 1) adjusting the pH value of the raffinate acid with ammonia water, adding a fluorination auxiliary agent, carrying out heat preservation stirring, and filtering to obtain a filtrate A; (2) taking the preheated and impurity-removed ferrous sulfate solution as filtrate B, adding a mixture of the filtrate A and hydrogen peroxide into the filtrate B, regulating the pH value of the system by using ammonia water, preserving heat for at least 30 minutes, and filtering to obtain a primary filter cake; 3) washing the primary filter cake until the conductivity of the washing water is less than 3.5 ms / cm, mixing phosphoric acid, pure water and the filter cake for size mixing, aging until the color of the size is changed, continuously keeping the temperature, filtering, washing the secondary filter cake until the conductivity of the washing water is less than 2.5 ms / cm, drying, calcining and crushing to obtain battery-grade iron phosphate; the raffinate acid is used for replacing monoammonium phosphate or diammonium phosphate, the preparation process is shortened, the production efficiency is improved, and the material meeting the requirements of battery-grade iron phosphate can be directly prepared.

A method for extracting high-purity cesium sulfate from high-salinity wastewater relates to the technical field of wastewater treatment and recovery. The method first freezes the high-salinity wastewater to precipitate the sodium ions therein in the form of high-grade sodium sulfate, and reduces the sodium ion and sulfate ion content in the frozen liquid. Subsequently, the potassium ion crystals are precipitated through the first extraction and back extraction, and the back extraction liquid is evaporated for the first time. Finally, the evaporated liquid is subjected to secondary extraction, back extraction, and evaporation to obtain a high-grade cesium sulfate product. It is not only simple and convenient to operate, but also has low requirements on equipment and has good practical value. A device for extracting high-purity cesium sulfate from high-salinity wastewater, which is used in conjunction with the above method, and includes a refrigeration tank, a first extraction tank, a first evaporation tank, a second extraction tank, and a second evaporation tank connected in series in sequence. It is not only simple in structure and easy to use, but also has high processing efficiency.

The invention provides a preparation method of a high-purity electronic-grade photoacid generator derived from 2-adamantanoic acid-trifluoropropane sulfonic acid, and the synthetic route is as follows: firstly preparing 3, 3, 3-trifluoro-2-hydroxy-1-propane sulfonate, then reacting with an adamantyl derivative, and finally performing ion exchange and purification with a cationic fragment. The product is M, 2-adamantanoic acid-trifluoropropane sulfonate, and M is a triaryl sulfonium salt, a diaryl iodonium salt and a derivative of the triaryl sulfonium salt and the diaryl iodonium salt. The invention has the advantages of high stability, good solubility, simple preparation method, no introduction of halogen ions in the preparation process, high product yield and purity, low metal ion content, convenient post-treatment and environmental friendliness, and the product as a photoresist-level core main material has wide application in the fields of semiconductor photoresists, other imaging systems, photocureable coatings and the like, and has wide application prospects. The market scale is continuously expanded, and the material is an indispensable key material in semiconductor manufacturing and other related fields.