13 results about "Ionic impurity" patented technology

The invention discloses a production method of high-purity electrolytic copper powder. Firstly, copper sulfate and sulfuric acid are used for preparing an acidic electrolyte, and a small amount of chloride ions are added; meanwhile, according to the technical requirements of the copper powder, some assistants are not added or a small amount of assistants are added into the solution, it is ensured that the sum of cation impurities of the electrolyte is smaller than or equal to 10 ppm, a diffusion boundary layer on the surface of the cathode becomes extremely thin under the strong shearing force generated when the cathode rotates at a high speed, copper ions can rush to the surface of the cathode at an extremely high speed, and the copper ions can be directly sprayed to the surface of the cathode. And the mass transfer is extremely strengthened. Therefore, the system can operate at the current density far higher than that of a traditional method, so that the preparation from the solution to the high-quality copper powder is directly completed, the reaction rate is extremely high, and the equipment productivity is improved. And the powder is stripped and coupled in one device from the cathode, so that the process is simplified, the cell voltage is reduced, side reactions such as hydrogen precipitation are inhibited, the current efficiency is improved, the operation cost is reduced, and the consistency and reliability of products are ensured.

The invention provides a regulation and control method of a separation system for UPS-level hydrochloric acid separation, and relates to the technical field of hydrochloric acid treatment. The method comprises the following steps: acquiring ion impurity concentration fluctuation data to obtain the concentration fluctuation level of ion impurities; based on the concentration fluctuation level, a classification algorithm is adopted to carry out classification processing on ion impurity types, and dominant impurity types are determined; the electric field intensity parameter is adjusted through an adjusting module according to the leading impurity category, a targeted ion separation parameter is generated, and the targeted ion separation parameter is used for optimizing an ion migration path; and carrying out dynamic reconstruction treatment on the filter assembly through a self-adaptive aperture configuration scheme to obtain an optimized filter assembly structure, and carrying out dynamic reconstruction treatment to adjust micro-pores so as to match the ion size. The concentration fluctuation of the ion impurities is monitored in real time, whether the separation system is abnormal or not is judged according to the concentration fluctuation, the operation stability of the separation system is improved, and meanwhile the product quality can be improved.

1. The name of the design product: electric deionization machine (EDI-XL). 2. The use of the design product: the design product is used for removing ion impurities in water. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The present invention provides an impurity removal method and a metal recovery method that can effectively remove impurities such as fluoride ions. [Solution] A method for removing impurities from a metal-containing solution obtained by leaching battery powder from lithium-ion battery waste with acid, comprising: a metal separation step of separating other metal ions from the metal-containing solution which contains lithium ions and other metal ions; and an electrodialysis step of performing electrodialysis using a bipolar membrane on the metal-containing solution which contains fluoride ions as impurities after the metal separation step to obtain a lithium hydroxide solution and an acidic solution, wherein the lithium hydroxide solution is used as a pH adjuster in the metal separation step.

The application discloses a kind of thiol and 4-methyl amino pyridine bifunctional group modified silica gel base material and its preparation and its application in catalytic synthesis, removal of acidic and alkaline residual impurities, removal of metal ion impurities for a kind of 248nm photoresist resin.The application is suitable for semiconductor photoresist resin electronic chemical synthesis and purification technical field.A new type of modified silica gel material containing bifunctional group is provided, which can be used for catalytic synthesis and purification of semiconductor, display electronic chemicals, especially suitable for catalytic synthesis and purification of metal ion impurities for a kind of semiconductor chemical amplification type photoresist resin, and has wide application prospect.

The invention relates to the technical field of detection of anions, in particular to a method for detecting anion impurities in tris (trimethylsilyl) phosphate, and aims to solve the problems that an existing common detection method is low in detection efficiency, complex in detection process, difficult to simply separate and detect various anion impurities at the same time and the like. The method comprises the following operation steps: (1) preparing a sample; (2) preparing leacheate and regeneration liquid; (3) carrying out gradient elution by using ion chromatography; and (4) carrying out quantitative analysis on the obtained anion impurities by an external standard method. By selecting specific ion chromatography conditions and using gradient elution, the peak appearance time of SO4 < 2-> can be remarkably shortened, the peak shape (sharper and narrower) of SO4 < 2-> is improved, the detection sensitivity is improved, the reproducibility is good, and the problem that anion impurities in tris (trimethylsilyl) phosphate are difficult to test is solved. The method is suitable for detecting tri (trimethylsilyl) phosphate anion impurities in experiments, the detection efficiency is improved, and a detection guarantee is provided for quality control in the tri (trimethylsilyl) phosphate production process.

The invention belongs to the technical field of chemical equipment, and particularly discloses a tower plate with an orthogonal multi-downcomer overflow structure and a method for separating and purifying gamma-butyrolactone by using the tower plate, the tower plate comprises at least two tower trays which are sequentially arranged in a tower body from top to bottom; four centrosymmetric overflow weirs are arranged on the top surface of the tower tray, the adjacent overflow weirs are vertically intersected, four centrosymmetric and vertically intersected downcomers are arranged on the bottom surface of the tower tray, and the downcomers are communicated with the overflow weirs; and the downcomers on the adjacent tower trays are distributed in the tower body in a staggered manner. The overflow weirs are arranged along the center of the tray, the length of the overflow weirs is equal to the radius of the tray, so that the length of the overflow weirs is effectively increased, and the adjacent overflow weirs are connected at the included angle of 90 degrees, so that the overflow weirs can form mutual support, the local overflow strength is effectively reduced, and the efficiency and the operation stability of the tray are improved; and efficient separation and removal of ion impurities in gamma-butyrolactone are facilitated.

1. The name of the design product: electrodeionization machine (EDI-EXL). 2. The use of the design product: the design product is used for removing ion impurities in water. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The present invention refers to a method for the recovery of lithium from a lithium containing brine, the method comprising the method steps of: (i) subjecting a lithium containing brine to one or more preliminary impurity removal steps to produce an intermediate brine comprising: less than 100 mg / L boron; less than 100 mg / L calcium; less than 100 mg / L magnesium; and less than 100 mg / L strontium; (ii) subjecting the lithium containing brine or the intermediate brine to at least one silicon removal step to reduce the silicon concentration to below 10 mg / L; (iii) treating the intermediate brine in at least one ion exchange step to remove further divalent cation impurities; (iv) treating the intermediate brine in at least one ion exchange step to remove further boron impurities; and (v) passing a purified brine resulting from steps (ii) to (iv) to a lithium recovery step to produce a lithium product and a lithium-depleted brine.

The invention relates to a method for preparing an electronic-grade hydroxylamine aqueous solution by using an industrial-grade 50% hydroxylamine aqueous solution as a raw material through a microfiltration, ion exchange and nanofiltration combined technology. The method comprises the following steps: firstly, removing suspended particles and colloidal substances by microfiltration pretreatment; removing ion impurities through a specially modified ion exchange resin combined bed; and finally, deeply purifying by utilizing a nanofiltration technology to obtain a high-purity product. The method is short in process route, safe to operate and low in cost, the electronic-grade hydroxylamine aqueous solution can be stably produced, the metal ion content is lower than 10 ppt, the particle size of particles is controlled to be larger than 0.1 micrometer and smaller than 50 particles / ml, the resistivity reaches 18.2 M omega.cm, and the industrial requirements of semiconductor manufacturing, integrated circuits and display panels are met.

The application discloses an electrochemical detection method for copper ion impurities in zinc electrolyte, wherein acetic acid-sodium acetate solution is used as a background solution, then mixed with an equal volume of zinc electrolyte to obtain a to-be-detected solution, and the pH value of the to-be-detected solution is adjusted to 3.0-4.0; silver nanowires are dispersed in an ethanol solution, then coated on FTO conductive glass as a working electrode, a platinum sheet is used as a counter electrode, and an Ag / AgCl electrode is used as a reference electrode; and an electrochemical workstation is used to obtain the oxidation current of copper ions after reduction deposition in the to-be-detected solution by differential pulse anodic stripping voltammetry I Cu , in the unit of muA; the concentration of copper ions in the to-be-detected solution C Cu is obtained by the following formula: C Cu ( I Cu + 2.69) / 151.55, in the unit of mg / L. The application realizes the detection of trace copper ion impurities in high-zinc-concentration electrolyte, is convenient to operate, does not need expensive equipment, and is suitable for real-time detection in a production environment.

The present invention provides a dianhydride compound purification process, which comprises: mixing a dianhydride compound with an organic solvent, carrying out ion impurity removal, and sequentially carrying out solution concentration, recrystallization and drying treatment to obtain a high purity dianhydride compound, ion exchange resin is adopted for ion impurity removal; the ion exchange resin comprises cation exchange resin and / or anion exchange resin. Compared with the prior art, the purification method provided by the invention does not need hydrolysis ring opening and is simple to operate, and the ion impurity content of the high-purity dianhydride compound can be controlled through the purification method, so that the synthesized polyimide has excellent mechanical property, corrosion resistance and product stability in application.

The utility model relates to the technical field of potassium chloride solution purification devices, and provides a potassium chloride solution purification device which comprises a purification bin, a liquid outlet pipe is fixedly installed at the bottom end of the purification bin, a purification mechanism is installed in the purification bin, and a cleaning mechanism is installed on the outer wall of the left side of the purification bin. A limiting mechanism is arranged on the outer wall of the rear end of the purification bin; the pretreatment bin is arranged right above the top end of the purification bin, a plurality of groups of supporting rods are fixedly mounted at the edge position of the bottom end of the pretreatment bin, the bottom ends of each group of supporting rods are fixedly connected with the purification bin, and a communicating pipe is hermetically connected to the middle position of the bottom end of the pretreatment bin; and the other end of the communicating pipe is hermetically communicated with the purifying bin. According to the technical scheme, the technical problem that tiny suspended solids, colloids and ionic state impurities in the solution are difficult to effectively remove by a plurality of existing potassium chloride solution purification devices is solved.