322 results about "Ammonium hydroxide" patented technology

The invention provides a salt-responsive temperature-resistant salt-resistant water-based drilling fluid tackifying filtrate reducer as well as a preparation method and application thereof, and belongs to the technical field of drilling. The tackifying filtrate reducer is prepared from the following raw materials in parts by mass: 30 to 50 parts of 1-(2-carboxyethyl)-2-vinylpyridine, 20 to 40 parts of (3-(methacrylamido) propyl) dimethyl (3-thiopropyl) ammonium hydroxide inner salt, 35 to 55 parts of N, N-dimethylacrylamide, 10 to 25 parts of 4-vinylpyridine, 300 to 500 parts of water and 1 to 5 parts of an initiator. According to the filtrate reducer, cations and anions are concentrated on one monomer molecule, so that the synthesized product contains the cations and the anions with the same charge number, has good adsorption capacity and salt response characteristics, is compatible with salt essentially, can effectively resist high temperature and high salt, and can be recycled. And the viscosity-increasing and filtrate-reducing agent has good viscosity-increasing and filtrate-reducing effects on the drilling fluid.

The invention belongs to the technical field of rare and precious metal recovery, and particularly relates to a method for recovering metallic silver from waste crystalline silicon battery pieces, which comprises the following steps: (1) putting the waste crystalline silicon battery pieces into an inorganic alkali aqueous solution for soaking reaction to obtain an aluminum-containing solution and dealuminized crystalline silicon pieces; (2) adding the dealuminized crystal silicon wafer into a mixed solution of organic acid and hydrogen peroxide for soaking reaction, filtering and washing to respectively obtain silver-containing filtrate and a silver-removed silicon wafer; (3) carrying out chlorination precipitation reaction on the silver-containing filtrate and a chlorine source, filtering and drying to obtain silver chloride powder; (4) adding silver chloride powder into an ammonia water solution, heating and stirring to completely dissolve silver chloride to obtain a silver-ammonia solution; (5) adding PVP (Polyvinyl Pyrrolidone) into the silver-ammonia solution, heating and stirring until the PVP is completely dissolved, adding ascorbic acid, and carrying out reduction reaction at room temperature to obtain metal silver powder precipitate; and filtering, washing and drying the precipitate to obtain the spherical silver powder. According to the method, the silver recovery efficiency is high, the spherical nanoscale silver powder can be prepared, and the purity is high.

The invention relates to the field of catalysts, in particular to a preparation method of a green and efficient copper catalyst. Comprising the following steps: (1) mixing basic cupric carbonate, ammonia water and water, adding ammonium salt at the same time, and preparing a copper ammonia solution as a precursor solution at room temperature; (2) mixing the precursor solution with a carrier or a carrier precursor to realize active component loading and catalyst preparation; and (3) filtering, washing, drying and roasting the mixed system in the step (2) to prepare the copper-based catalyst. According to the preparation method of the copper ammonia complexing precursor solution, preparation of the copper ammonia complexing solution at room temperature can be achieved, heating operation in the precursor preparation process is avoided, meanwhile, the nitrogen content of the system and nitrogen emission in the subsequent roasting process can be reduced by preparing the copper-based catalyst through the basic copper carbonate precursor, and efficient and green preparation of the catalyst is achieved.

The invention discloses a catalyst for an n-butene isomerization reaction and a preparation method thereof, and belongs to the technical field of catalysts. The preparation method comprises the following steps: mixing a silicon source, an aluminum source, tetrapropylammonium hydroxide and water, adding boric acid, and crystallizing to obtain a seed crystal; the method comprises the following steps: mixing a silicon source, an aluminum source, pyridine and water, adding a seed crystal and ammonium fluoride, and crystallizing to obtain a core-shell type molecular sieve; adding the core-shell type molecular sieve into the bimetallic complex solution for dipping to obtain a metal-loaded type molecular sieve; adding the metal-loaded molecular sieve into a triethyl phosphine ethanol solution for treatment to obtain a phosphorus-modified molecular sieve; uniformly mixing the phosphorus-modified molecular sieve, pseudo-boehmite, sesbania powder and water, kneading, performing extrusion molding, drying and calcining to obtain the catalyst. The catalyst prepared by the invention is used for n-butene isomerization reaction, and has excellent catalytic activity and isobutene selectivity.

The invention discloses an alkaline medium-coarsening micro-etching solution as well as a preparation method and a micro-etching method thereof, and relates to the technical field of printed circuit board production. The alkaline medium-coarsening micro-etching liquid is prepared from the following components in mass concentration: 5-30 g / L of ammonium chloride, 0.5-2 g / L of tetramethylammonium hydroxide, 5-15 g / L of ammonia water, 2-10% of a catalyst, 0.1-1% of a wetting agent, 0.2-2% of an accelerator, 0.3-1.5% of a stabilizer, 0.5-5% of a color difference regulator and the balance of deionized water. The invention provides an alkaline medium-coarsening micro-etching solution and a preparation method and a micro-etching method thereof, which can solve the problem of color change of a board surface after micro-etching of a circuit board and overcome the defect that a sulfuric acid hydrogen peroxide micro-etching system is easily polluted by chloride ions, and can effectively improve the problem that hydrogen peroxide is easily decomposed by replacing sulfuric acid hydrogen peroxide with an alkaline substance. And the micro-etching rate is stable.

The invention provides a method for preparing high-purity flaky alumina based on a hydrolysis method, and belongs to the field of high-purity flaky alumina powder. The method comprises the steps that metal aluminum scraps are pretreated; the method comprises the following steps: putting metal aluminum scraps, an alkaline organic matter catalyst and a morphology control agent into water, and carrying out a hydrolysis reaction at a set temperature for a set time to obtain a reaction mixed solution; carrying out solid-liquid separation, washing and drying on the reaction mixed solution to obtain flaky aluminum hydroxide; and roasting the flaky aluminum hydroxide to remove crystal water so as to obtain high-purity flaky aluminum oxide, wherein the alkaline organic matter catalyst comprises at least one of the following components: tetraethylammonium hydroxide, tetramethylammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide; the morphology control agent comprises at least one of ammonium bifluoride and ammonium fluoride. The preparation method disclosed by the invention is simple in process flow, free of an impurity removal process, mild in reaction condition, short in reaction time and free of environmental pollution, and the product is regular in shape and high in purity.

The invention discloses a special CMP (Chemical Mechanical Polishing) solution for a silicon carbide wafer. The special CMP solution consists of the following components: 5-12% of alpha-spherical nano aluminum oxide; 1-5% of a complexing agent, preferably citric acid; 0.1%-1.0% of a composite inhibitor; 0.5-3% of an oxidizing agent which is ammonium persulfate; 0.05%-0.5% of a dispersion stabilizer; the pH regulator is tetramethylammonium hydroxide and is used for regulating the pH of the polishing solution to 8-11; and the balance of deionized water or ultrapure water. The preparation method of the polishing solution comprises the following steps: S1, adding the alpha-spherical nano aluminum oxide into polyether polyol and ultrapure water, and carrying out ultrasonic dispersion; s2, adding a complexing agent, a composite inhibitor and an oxidizing agent, and magnetically stirring; s3, adjusting the pH (Potential of Hydrogen) to 8 to 11 by using a tetramethylammonium hydroxide solution; and S4, after standing at room temperature, filtering through a filter membrane to obtain the CMP polishing solution. The silicon carbide CMP polishing solution provided by the invention combines alpha-spherical nano aluminum oxide and an ammonium persulfate / PEG 6000 / composite inhibitor synergistic system, can ensure high material removal rate and low defect density, and has excellent dispersion stability and metal residue control ability.

This invention provides a dry powder drag-reducing agent for fracturing fluids and its preparation method, belonging to the technical field of fracturing materials for drilling. The method includes the following steps: dissolving 4-bromobutyryl chloride and N-dodecylmethylamine in acetonitrile, heating and stirring to react; adding polyethylene glycol monomethyl ether acrylate and dichloromethane; stirring under a nitrogen atmosphere; purifying to obtain a double-tailed hydrophobic monomer; mixing core-shell Fe3O4 / SiO2 composite nanoparticles, ethanol aqueous solution, KH570, and ammonia solution; stirring; purifying to obtain modified SiO2 / Fe3O4; adding acrylamide, acrylic acid, sodium 2-acrylamido-2-methylpropanesulfonate, the double-tailed hydrophobic monomer, and modified SiO2 / Fe3O4 to water; adjusting the pH value; mixing and stirring with nitrogen gas; adding an azo initiator; stirring; cooling; purifying; vacuum drying; and pulverizing into powder to obtain the dry powder drag-reducing agent for fracturing fluids. This invention achieves good drag-reducing performance while also possessing certain heat resistance, making it better suited for fracturing operations in drilling processes.

The application discloses a preparation method and purification process of copper hydroxide, a certain amount of anhydrous copper sulfate is accurately weighed, and a certain volume of deionized water is added to prepare a solution with a certain concentration, a copper ammonia solution is prepared: slurry is prepared from circuit board sludge, screening is performed, ammonium bicarbonate or ammonium carbonate is added for reaction, and a copper ammonia solution containing carbonate or bicarbonate is obtained through purification; in addition, high-purity copper powder is added into concentrated ammonia water, concentrated hydrogen peroxide solution is slowly dropped into the concentrated ammonia water, and the dropping is continued until no large amount of bubbles is generated in the solution, and the solution is filtered to obtain a clear indigo blue solution. The production process adds the step of adding a stabilizer and stirring, guarantees the stable state of the copper hydroxide crystal, and enables the copper hydroxide crystal to remain unchanged into copper oxide for one year in an environment with a temperature as high as 60 degrees.

A system and method for generating aqueous ammonia of variable concentration from water and any existing anhydrous ammonia source. The system is modular and safe, can be powered by almost any electrical source, can produce varying volumes of output aqueous ammonia without a prohibitive loss of efficiency, and can produce varying concentrations of output solution.

The invention provides a chemical composition for removing etching residues, which comprises organic ammonium, a corrosion inhibitor, an organic solvent, an inhibitor, hydroxylamine and deionized water, the organic ammonium is selected from one or more of choline hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutyl ammonium hydroxide, tributyl methylammonium hydroxide, benzyl trimethyl ammonium hydroxide, ethyl trimethyl ammonium hydroxide, diethyl dimethyl ammonium hydroxide and tris (2-ethoxyl) methylammonium hydroxide, and the organic ammonium is selected from one or more of choline hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutyl ammonium hydroxide, tributyl methylammonium hydroxide, benzyl trimethyl ammonium hydroxide, ethyl trimethyl ammonium hydroxide, diethyl dimethyl ammonium hydroxide and tris (2-ethoxyl) methylammonium hydroxide; the inhibitor is selected from one or more of fructose, galactose, lactose, maltose, glucose, ascorbic acid, hydroxylamine sulfate and ethanol hydrazine. Compared with the prior art, the chemical composition for removing the etching residues can effectively remove the residues after plasma etching, meanwhile, etching of AlCu, TiN / Ti and silicon oxide is avoided, an operation window is large, and the chemical composition has good application prospects in the semiconductor etching process.

The application discloses a synthesis method of ZSM-35 and ZSM-5 composite zeolite, the composite zeolite takes ZSM-35 as a core and takes ZSM-5 as a shell, and the synthesis method comprises the following steps: (1) uniformly mixing ZSM-35 zeolite, a silicon source, an aluminum source, a template agent, ammonium hydroxide, alcohol and water; then sequentially performing dynamic treatment and static treatment; then separating solid substances and drying the solid substances; (2) mixing the dried substances obtained in the step (1) with inorganic alkali and water, and evaporating water to prepare dry gel; (3) performing crystallization by adopting a gas phase crystallization method, and then performing separation, drying and calcination to obtain the composite zeolite. The ZSM-35 and ZSM-5 composite zeolite can keep the integrity and crystallinity of the ZSM-35 and ZSM-5 skeleton structures, and the core and the shell are combined closely, are not separated and are stable in structure.

The invention relates to a co-production preparation method of dialkyl phosphate and tetraalkyl ammonium sulfate, which comprises the following steps: trialkyl phosphate and trialkylamine are subjected to a first reaction at a first temperature, then a reaction system and excessive sulfuric acid are subjected to a second reaction at a second temperature in the presence of water, and the first temperature is higher than the second temperature; after the reaction is finished, adding an extracting agent to extract the system, and separating to obtain an organic phase and a water phase; removing the extracting agent in the organic phase to obtain dialkyl phosphate; adding tetraalkyl ammonium hydroxide into the water phase until the water phase is neutral or nearly neutral to obtain a water solution containing tetraalkyl ammonium sulfate. According to the method, the dialkyl phosphate can be obtained, the tetraalkyl ammonium sulfate salt with high added value can be obtained, the raw materials are easy to obtain, the process route is simple, the atom economy is high, the method is environment-friendly, the operation is simple, and the cost is low.

The present invention relates to a process for straightening / straightening keratin fibres, in particular hair, comprising i) the application to the keratin fibres of a composition comprising at least one alkanolamine, at least one compound chosen from amino acids and their derivatives, and at least one alkali metal, alkaline earth metal or ammonium hydroxide, ii) a rinsing step, iii) optionally a drying step, and iv) a straightening / straightening step.

The present invention relates to the technical field of production of high-purity quaternary ammonium bases, and provides a method for preparing high-purity adamantyl trimethylammonium hydroxide and a high-purity quaternary ammonium base prepared thereby. The method for preparing high-purity adamantyl trimethylammonium hydroxide comprises the following steps: S1, material preparation: adding adamantyl trimethylammonium chloride into water to obtain an aqueous solution, and then adding an adsorbent thereto to obtain a pretreatment solution, wherein the adsorbent contains stearate ions; S2 electrolysis: adding the pretreatment solution to a raw material chamber of an electrolytic cell for electrolysis, so that adamantyl trimethyl ammonium cations enter a cathode chamber through a cation membrane and combine with hydroxide ions generated by the cathode to form adamantyl trimethylammonium hydroxide, so as to obtain a quaternary ammonium base. The method for preparing high-purity adamantyl trimethylammonium hydroxide has the advantage of improving the quality of the quaternary ammonium base product.

This invention relates to a copper-modified NaX molecular sieve adsorbent, its preparation method, and its application, and relates to the field of adsorption and separation materials technology. The preparation method of this invention includes the following steps: (1) mixing powdered NaX molecular sieve and copper ammonia solution to obtain a mixed suspension; filtering the mixed suspension under reduced pressure to separate the solid product; washing and filtering the solid product to obtain a wet molecular sieve solid; (2) vacuum drying the wet molecular sieve solid; grinding the solid to obtain a powder sample; and calcining the powder sample at a constant temperature to obtain the copper-modified NaX molecular sieve adsorbent. The preparation method of this invention significantly simplifies the process flow, reduces production costs, and produces a copper-modified NaX molecular sieve adsorbent with high pore utilization and high active site density, significantly improving the adsorption performance of NaX molecular sieve for boron and phosphorus impurities.

The application discloses a Beta-ZSM-12 composite structure zeolite and a preparation method thereof. In the composite structure zeolite, the Beta zeolite is a core phase, and the ZSM-12 zeolite is a shell phase. The preparation method comprises the following steps: (1) uniformly mixing Beta zeolite, a silicon source, ammonium hydroxide, alcohol and water, then dynamically treating for a certain time and then statically treating, separating, drying, and obtaining a silicon oxide-Beta zeolite composite, wherein the silicon source is selected from organic silicate; (2) mixing the silicon oxide-Beta zeolite composite obtained in the step (1), nano iron oxide particles, water and sugar, evaporating water, then heating under inert conditions, then acid treating, and then separating and drying to obtain a carbon-silicon oxide-Beta zeolite composite; and (3) mixing water, the carbon-silicon oxide-Beta zeolite composite, an inorganic alkali, a template agent and an aluminum source, then loading into a reactor for crystallization reaction, and then separating, drying and calcining to obtain the Beta-ZSM-12 composite structure zeolite. The composite structure zeolite has a stable core-shell structure and can be used as a catalyst or a catalyst carrier.

The invention discloses a preparation method of a self-cleaning textile coating with an underwater easy-to-decontaminate function, and belongs to the technical field of textile fabrics. The method comprises the following steps: selecting a fabric, and carrying out pretreatment; the preparation method comprises the following steps: mixing ammonium hydroxide and ethanol, then adding tetraethyl orthosilicate, and reacting to obtain a reaction solution; soaking the pretreated fabric in a reaction solution to complete construction of a super-hydrophilic inorganic layer; and sequentially putting the fabric into the NaCl solution of the polycation electrolyte and the NaCl solution of the polyanion electrolyte for soaking, washing and drying to finish the construction of the polyelectrolyte layer on the fabric, so as to obtain the self-cleaning textile coating with the underwater easy-to-decontaminate function. The coating prepared by the invention has excellent self-cleaning performance and good surface durability, and can quickly remove oil pollutants from water.

The invention relates to the chemical technology related to mineral salts and can be used in the chemical industry. A process for the production of ammonium bromide from a bromine-containing polycomponent aqueous mineral raw material, comprising: two-stage oxidation of bromine ions during acidification of the brine using gaseous chlorine; air desorption of the primary bromine; absorption of the same using a cooled solution of ammonium bromide; and reduction using an ammonia solution. The resulting concentrated solution of ammonium bromide is evaporated until crystals are formed. The ammonium bromide crystals are dried, and the mother liquor is used to produce a solution of ammonium bromide as a commercial product.

This invention relates to the field of spray system technology, and more particularly to an alkaline spray system for the production of ethyl chloroformate, comprising the following steps: S1, adding tetramethylammonium hydroxide to water, heating to room temperature, stirring until completely dissolved, adding modified sodium metasilicate, disodium ethylenediaminetetraacetate, and sodium lignosulfonate, controlling the temperature and stirring, filtering to obtain an alkaline solution; S2, turning on the power to the control system, ensuring the control system operates normally, setting the operating parameters of the spray system, starting the alkaline solution pump, drawing the alkaline solution from the storage tank, conveying it through pipelines to the spray heads, adjusting the pump's output flow rate, and starting intermittent, uniform spraying of the alkaline solution. The waste liquid after spraying flows through pipelines into a sedimentation tank for post-treatment. The alkaline spray system of this invention can significantly improve the purification efficiency of acidic gases, heavy metal ions, and organic pollutants in waste gas.

The application discloses a separation method, characteristic spectrum and construction method of five substances in Ibeimu. The separation method comprises the following steps: subjecting a test sample solution to high performance liquid chromatography-evaporative light scattering detector detection to separate the components to be detected; the components to be detected comprise peimisine, sipeimine, ibeimine A, sipeimine and sushabeimine; and the preparation method of the test sample solution comprises the following steps: extracting alkaloids from Ibeimu standard decoction or pieces by using an ammonia solution to obtain a mixed solution; and heating and refluxing the mixed solution and a mixed solvent. The separation method can effectively separate the substances simultaneously, and the separation time is relatively short. The application establishes a quality evaluation method for qualitatively evaluating the Ibeimu standard decoction, and the method is relatively systematic, simple, easy to implement, specific and good in repeatability. The characteristic spectrum of the pieces and the standard decoction has high similarity. The method can be used for quality control of the Ibeimu standard decoction, and provides basic data support for subsequent formula granules and other researches.

A method for reducing or preventing corrosion or fouling in an apparatus for carrying out a chemical process, where corrosion or fouling is caused by acidic compounds present in the chemical process, which comprises the addition of at least one quaternary ammonium hydroxide of the formula (I) to the apparatus, wherein the chemical process is carried out: [Chem. 1] where R1, R2, R3 are each independently C1-C10 alkyl; R4 is inter alia C1-C18 alkyl, benzyl, monocycloalkyl having 5, 6, 7 or 8 carbon atoms, bicycloalkyl having 6 to 8 carbon atoms, tricycloalkyl having 7 to 10 carbon atoms, where monocycloalkyl, bicycloalkyl and tricycloalkyl are unsubstituted or substituted by 1 or 2 methyl groups, or tri-C1-C4 alkyl ammonium groups. R1 and R2 together with the nitrogen atom may also form a 5 or 6-membered, saturated nitrogen heterocycle, which is unsubstituted or carries 1 or 2 methyl groups; and / or R3 and R4 together with the nitrogen atom may also form a 5 or 6-membered, saturated nitrogen heterocycle, which is unsubstituted or carries 1 or 2 methyl groups.

The present invention relates to a composition for removing post-etch residues from a substrate, the substrate comprising a surface of a molybdenum layer, the composition comprising: (a) 10 to 60% by mass of a water-miscible organic solvent; (b) 4 to 15 mass% C1 to C 12 amine (c) 0.5 to 4 mass% C4 to C 16 Quaternary ammonium hydroxide; (d) 0.1 to 5 mass% of C2 to C 10 Polyols; (e) 0.01 to 3% by mass of polyethyleneimine; and (f) water Includes.

According to the present invention, it is possible to provide a composition for removing a photoresist for forming a copper-containing pattern after the formation of the pattern, the composition comprising: an alkaline agent comprising at least one selected from the group consisting of an alkanolamine, a quaternary ammonium hydroxide, and an inorganic base; an organic solvent in which the Hansen solubility parameter coordinates fall within the range of a sphere having a radius of 3.60 MPa 0.5 or less centered on [Delta] d = 16.0, [Delta] p = 8.7, and [Delta] h = 15.5; and an azole compound.

This invention provides a method for preparing high-purity ultrafine yttrium oxide, relating to the field of ultrafine oxide powder preparation technology. The method involves removing impurities from a 5N-6N grade yttrium chloride solution to obtain a yttrium chloride solution with low non-rare earth impurities. While emulsifying and shearing an ammonia solution, the low-non-rare earth impurity yttrium chloride solution is introduced into the solution via atomization until the pH of the resulting solution reaches 8-10, yielding a yttrium hydroxide colloidal solution. While emulsifying and shearing the yttrium hydroxide colloidal solution, an oxalic acid solution is introduced into the solution via atomization until the pH of the resulting solution reaches 1.8-2.5. The solution is then filtered to obtain ammonium oxalate yttrium precipitate. Finally, calcination yields high-purity ultrafine yttrium oxide powder. This invention can prepare high-purity ultrafine yttrium oxide with a purity of 99.999-99.9999%, D... 50 The diameter is 0.3–0.5 μm, D 90 With a diameter of less than 1.0 μm, it is suitable for applications such as transparent ceramics and electronic ceramics.

The utility model discloses a kind of tetraalkyl ammonium hydroxide recovery devices, it is related to tetraalkyl ammonium hydroxide recovery technical field, and wherein, tetraalkyl ammonium hydroxide recovery device includes adsorption unit and desorption unit, adsorption unit includes adsorption device, adsorption cavity of adsorption device is filled with adsorbent, liquid inlet line is used to introduce waste water and / or regenerating medium, liquid outlet line is used to discharge reclaimed water and / or tetraalkyl ammonium hydroxide solution, desorption unit includes desorption reagent line and / or desorption device;By adsorbent directly absorbing tetraalkyl ammonium hydroxide in waste water, the complexity of processing is reduced, the consumption of reagent is reduced, can be realized by desorption reagent or desorption device tetraalkyl ammonium hydroxide desorption, and the regeneration of adsorbent is realized, and after desorption, pure tetraalkyl ammonium hydroxide can be used for developing again by adjusting concentration and discharging reclaimed water, while realizing waste water purification, resource recovery and cost control.

The invention relates to a method and a device for detecting the concentration of trace NH4 < + > ions in a metal raw material used for preparing a catalyst. The method comprises the following steps: 1) dissolving a metal raw material, carrying out complexing treatment on a solution of the metal raw material, carrying out acid regulation and quantification on the solution by utilizing an acid solution, transferring the treated solution into a measuring container, adding a sodium hydroxide solution, and detecting the potential of a solution to be detected by utilizing an ammonia gas sensitive electrode; 2) detecting the potential of a standard concentration ammonia solution by using an ammonia gas sensitive electrode; and 3) drawing a standard curve and calculating the ammonium ion concentration by using the standard curve. The method for measuring the concentration of the trace NH4 < + > ions in the high-concentration metal is established for the first time, the operation is rapid, simple and feasible, the result is accurate, the precision is high, and the blank of the method for measuring the NH4 < + > ions in the raw material for preparing the catalyst at present is filled.

The invention discloses a high-stability method for determining the content of benzyltrimethylammonium hydroxide through a non-aqueous titration method, and belongs to the technical field of analysis and detection of synthetic reagents, in the method, glacial acetic acid is adopted as a solvent system, and the hydrolysis reaction of benzyltrimethylammonium hydroxide is effectively inhibited. In the traditional water phase detection, the high polarity and strong protonation capability of water easily cause the decomposition of an object to be detected, while the weak acidity and low dielectric constant characteristics of glacial acetic acid not only slow down the hydrolysis rate, but also enhance the dissociation capability of a weakly alkaline substance, so that the titration reaction is more thorough. In addition, perchloric acid is high in solubility in glacial acetic acid and stable in chemical property, side reaction interference is avoided, the accuracy of a detection result is further improved, a mild rotary evaporation method is adopted for sample pretreatment, moisture is removed by controlling the temperature and the pressure within a safe range, and the sample structure is prevented from being damaged by high temperature; complex spectrum or electrochemical equipment is not needed, the end point judgment step is simplified, and the detection time is shortened.

The invention relates to the technical field of industrial solid waste resource utilization, in particular to a red mud activation method and a preparation method and application of a red mud-based cementing material. Aiming at the technical problems of low activity, serious scumming, high energy consumption and the like of the existing red mud cementing material, efficient activation of the red mud is realized through a three-stage transition activation mechanism. The cementing material is prepared by taking 80-85 parts of activated red mud powder and 15-20 parts of semi-hydrated phosphogypsum powder as main raw materials, and matching 50-60 parts of machine-made sand, 0.01-0.02 part of a water reducing agent, 2-4 parts of a composite alkali activator and 40-50 parts of water. Wherein the activated red mud powder is obtained through drying, ball milling, screening and medium-temperature thermal activation treatment at the temperature of 400-450 DEG C, and the semi-hydrated phosphogypsum powder is obtained through drying, ball milling, screening and drying treatment at the temperature of 150-200 DEG C. The composite alkali activator is composed of 50 wt% of tetramethylammonium hydroxide and 50 wt% of water glass with the modulus of 2.0. The activity of the red mud is improved from 40-50% to 90-100%, the 28-day compressive strength reaches 45-49 MPa, the scumming area is smaller than 0.1%, and an innovative solution is provided for bulk resource utilization of the red mud.

The invention provides a method for preparing a molecular sieve from kaolin through ice crystal crystallization and application, the method for preparing the molecular sieve from kaolin through ice crystal crystallization comprises the following steps: calcining purified kaolin in a muffle furnace; dissolving the calcined kaolin and sodium silicate nonahydrate in deionized water, adding a surfactant tetrapropylammonium hydroxide and a gemini ionic surfactant butane-1, 4-bis (dodecyl dimethyl ammonium bromide), and stirring and heating; adjusting the pH value, forming a colloidal body, stirring to fully disperse and uniformly mix the precipitate, immersing the precursor in an ice-water bath, placing the precursor in an ultrasonic oscillator after the ice-water bath for ultrasonic oscillation treatment, standing, placing the precursor in a 25 DEG C water bath for gradient temperature recovery to avoid cracks formed by thermal shock, then heating the precursor in a water bath for aging, placing the precursor in the ultrasonic oscillator for ultrasonic oscillation treatment again, and drying to obtain the composite material. And carrying out hydrothermal crystallization reaction, washing, drying, grinding and calcining to remove the template agent. The molecular sieve prepared by the method is used for adsorbing and recycling phosphorus and fluorine in phosphogypsum leachate.