206 results about "Sodium Bicarbonate Solution" patented technology

The invention relates to an antibacterial and anti-fouling ceramic product glaze and a preparation method, and belongs to the technical field of ceramic product glaze preparation, the ceramic product glaze comprises the following raw materials: a component A: a base material, a water glass solution, a sodium bicarbonate solution, a gadolinium nitrate solution, a europium nitrate solution, a silver nitrate solution and sodium cocoate; and the component B comprises the following components: dimethoxy methyl (3, 3, 3-trifluoropropyl) silicon, polysiloxane, dodecenyl succinic anhydride, gamma-methacryloxy propyl trimethoxy silane and white gasoline. Silver nitrate serves as a main material, europium nitrate serves as an auxiliary material, gadolinium nitrate excites the activity of silver and europium ions, and the silver nitrate, the europium nitrate and the gadolinium nitrate cooperate, so that the prepared ceramic product glaze has excellent antibacterial performance; sodium cocoate is added to form a steric hindrance effect, so that agglomeration among system particles is inhibited, and the antibacterial property of the glaze is enhanced; according to the anti-fouling glaze disclosed by the invention, the dimethoxymethyl (3, 3, 3-trifluoropropyl) silicon and the polysiloxane are added, so that the prepared glaze has a lasting anti-fouling effect.

This application relates to the field of ceramsite, and specifically discloses a preparation process for two-stage water-retaining ceramsite from coal gangue. The preparation process includes green pellet preparation, drying section, pyrolysis section, decarbonization section, first roasting section, soaking section, second roasting section, and cooling section; the green pellet preparation includes: wetting coal gangue powder with an organic solution, stirring evenly, and kneading with biomass material. The mass ratio of coal gangue powder to biomass material is 1 kg:(3-9) g to obtain green pellets; the soaking section includes: transferring the green pellets after the first roasting section to the soaking section, with the material layer temperature below 900 °C, and evenly spraying nano-silica during the transfer process, spraying 1-2.5 g per 100 g of green pellets; the cooling section includes: using one of sodium bicarbonate solution, ammonium bicarbonate, and ammonia water to form a water mist mixed with air to cool the roasted ceramsite. The prepared ceramsite has a rich and gradient pore structure, can quickly absorb water, and has excellent water-retaining performance.

The invention discloses an HPVC power cable protection pipe and a preparation method thereof, and relates to the technical field of cable protection pipes. The HPVC power cable protection tube is at least prepared from the following raw materials in parts by weight: 100 parts of high-strength polyvinyl chloride, 35 to 45 parts of epoxy acrylate rubber, 5 to 8 parts of vinyl chloride-g-acrylate copolymer, 8 to 12 parts of epoxidized soybean oil, 3 to 5 parts of calcium-zinc composite stabilizer, 5 to 15 parts of modified hydrotalcite, 0.1 to 0.5 part of beta-diketone, 0.8 to 1.5 parts of calcium stearate and 10 to 20 parts of flame retardant. 12 to 15 parts of modified nano calcium carbonate, 5 to 8 parts of talcum powder, 0.6 to 1.2 parts of antioxidant, 1 to 2 parts of anti-aging agent 4010 and 0.5 to 1.5 parts of ultraviolet light absorber UV531; the modified hydrotalcite is obtained by adding a mixed solution of calcium nitrate and lanthanum nitrate, a sodium hydroxide solution and a sodium bicarbonate solution into a lauryl sodium sulfate solution, mixing and aging, and then carrying out a post-treatment process. The HPVC power cable protection tube prepared by the invention has relatively high strength, good mechanical properties, weather resistance and cold resistance, and long service life.

The invention discloses a nano cerium oxide synthesis method which comprises the following steps: preparing a reaction solution; performing ultrasonic reaction; carrying out aging treatment; centrifugally washing; drying and calcining; the cerium salt solution is prepared from soluble cerium salt, and the concentration of the cerium salt solution is 0.01 mol / L to 1 mol / L; the precipitant solution is one or more of ammonia water, a sodium hydroxide solution, a sodium carbonate solution and a sodium bicarbonate solution, and the concentration of the precipitant solution is 0.2 mol / L-8 mol / L; the ultrasonic power of the ultrasonic microreactor is 10W to 1000W; the calcining temperature ranges from 400 DEG C to 1000 DEG C. The nano cerium oxide with less agglomeration, controllable particle size, uniform size and adjustable morphology is obtained on the basis of super-strong mixing and crystallization promoting capabilities of the ultrasonic microreactor. Meanwhile, the method is simple and convenient to operate, easy to amplify and convenient for industrial production.

The invention discloses a preparation method of micromolecular active collagen peptide, which comprises the following steps: (1) cutting fresh leather into fragments, pretreating the leather with a sodium bicarbonate solution, rinsing the leather with deionized water, and refrigerating and storing; (2) mixing papain, bromelain, pancreatin, pepsase, alkaline protease, neutral protease and flavourzyme to obtain a compound enzyme preparation; (3) performing high-pressure steam sterilization on the leather at 110-140 kPa and 120-122 DEG C to obtain leather with the hydrolysis degree of 75-85%, then adding distilled water into the leather to obtain mucilage, then adding a compound enzyme preparation into the mucilage, reacting for 5.5-6.5 hours at the pH of 6.8-7.2 and the temperature of 50-55 DEG C, and then performing enzyme inactivation at the temperature of 85-95 DEG C; and (4) after the reaction system is cooled to room temperature, purifying and centrifuging the reaction system, and taking clarified supernate, thereby obtaining the product. Different animal skins are treated, the proportion of peptide fragments with the molecular weight smaller than 1000 Da of the prepared small-molecule active collagen peptide is larger than or equal to 80%, and the hydroxyproline content is larger than 3%.

The invention relates to the technical field of medical, dental or dressing preparations, in particular to a preparation method of ertapenem sodium for injection. The preparation method comprises the following steps: S1, adding a prescription amount of sodium bicarbonate into water, cooling and stirring to obtain a sodium bicarbonate solution; and S2, adding half of the prescription amount of ertapenem sodium into water, stirring at low temperature for dissolving, then adding a sodium bicarbonate solution, then adding the rest of ertapenem sodium, adjusting the pH value with the sodium hydroxide solution, then adding the modified magnolol, adding water to a certain amount, and then carrying out sterile filtration, subpackaging and freeze drying to obtain the ertapenem sodium injection. The preparation with better stability is obtained through the method, so that the stability of the preparation in the preparation process, transportation and long-term storage can be ensured.

The invention discloses a pulmonary tuberculosis sputum taking device, which relates to the technical field of pulmonary tuberculosis sputum taking, specifically comprises a portable box, an adjustable sputum aspirator, a sputum storage tank, a sheath tube and a sputum taking tube, and is characterized in that a cavity for placing the adjustable sputum aspirator, a micro liquid pump, a control box, a liquid storage box and a storage drawer is formed in the portable box; the upper end and the lower end of the portable box are each fixedly provided with a fixing ring for installation of a bandage. The sputum taking tube is sleeved with the sheath tube for spraying normal saline or sodium bicarbonate solution, so that only one-time tube placement is needed in the sputum taking process, repeated tube placement is not needed, the comfort of a patient is improved, the end, making contact with the breathing inner wall of the patient, of the sputum taking tube is improved, a plurality of flexible contacts are designed, and the sputum taking tube is convenient to use. Therefore, when the sputum taking tube is in contact with the respiratory inner wall mucous membrane of a patient, the sputum taking tube is separated by the soft flexible contact, so that the end of the sputum taking tube cannot scratch the respiratory inner wall mucous membrane.

The invention relates to the field of ceramsite, and particularly discloses a two-stage coal gangue water-retaining ceramsite preparation process which comprises green pellet preparation, a drying stage, a pyrolysis stage, a decarburization stage, a first roasting stage, a soaking stage, a second roasting stage and a cooling stage. The green pellet preparation comprises the steps that coal gangue powder is wetted with an organic solution and stirred to be uniform, the mixture is kneaded with the biomass material, the mass ratio of the coal gangue powder to the biomass material is 1 kg: (3-9) g, and the green pellets are obtained; the soaking section comprises the steps that the green pellets obtained after first-section roasting are transferred to the soaking section, the temperature of a material layer is lower than 900 DEG C, nano silicon dioxide is evenly sprayed in the transferring process, and 1-2.5 g of nano silicon dioxide is sprayed to every 100 g of green pellets; and the cooling section comprises the following steps: forming water mist by adopting one of a sodium bicarbonate solution, ammonium bicarbonate and ammonia water, and cooling the roasted ceramsite by mixing with air. The prepared ceramsite has abundant gradient pore structures, can quickly absorb water and has excellent water retention performance.

The invention relates to the technical field of linalool synthesis, in particular to a decoloring and aroma-keeping method for synthesizing linalool, which comprises the following specific steps: S1, cracking generation: heating beta-pinene to high temperature, and cracking the beta-pinene to generate myrcene; s2, rapid cooling: rapidly cooling the split product myrcene to avoid side reaction; s3, crude sample generation: in the presence of an acid catalyst, myrcene reacts with water to generate linalool, the reaction temperature is 40-80 DEG C, and the reaction time is 4-12 hours; s4, neutralizing the crude sample: after the reaction is finished, neutralizing residual acid by using a sodium bicarbonate solution, and separating an organic phase by using a separating funnel; s5, washing the crude sample: washing the organic layer to be neutral, and removing water-soluble impurities at the same time; s6, purifying the crude sample: adding anhydrous sodium sulfate to dry an organic layer. According to the decoloring and fragrance-keeping method used in the invention, the synthesized linalool is easy to decolor and natural in fragrance, can easily meet the standards of food additives and spice supplies, and has a wide application prospect.

The invention relates to the technical field of textiles, in particular to high-breathability antibacterial lining cloth and a preparation method thereof. The preparation method comprises the following steps: adding ethyl methacrylate, hydroxyethyl acrylate, modified chitosan, modified silver-loaded titanium dioxide, modified lignin and a lauryl sodium sulfate solution to obtain a pre-emulsion; and adding a lauryl sodium sulfate solution, a sodium bicarbonate solution and an ammonium persulfate solution into the pre-emulsion to obtain the acrylic acid adhesive. The high-breathability polyester fabric is soaked in the acrylic acid adhesive for 1-2 min, roll compacting and baking are conducted after soaking is completed, and the high-breathability antibacterial lining cloth is obtained. The high-breathability antibacterial lining cloth prepared by the preparation method has excellent antibacterial performance and ultraviolet resistance, so that the high-breathability antibacterial lining cloth has a wide application prospect in the technical field of textiles.

The utility model belongs to the field of chemical raw material recovery, and discloses a system for recovering sodium bicarbonate from purified terephthalic acid membrane concentrated water. The system comprises an acidification subsystem, a low-temperature evaporative crystallization subsystem and a salt leaching subsystem, the acidification subsystem comprises a concentrated water feeding pump and an acid feeding pump; the acidification tower comprises a tower body and a tower kettle which are connected up and down; an acid feeding hole is formed in the middle lower part of the tower body, and a concentrated water feeding hole is formed in the middle upper part of the tower body; the concentrated water feeding pump is connected with the concentrated water feeding hole; the acid feeding pump is connected with the acid feeding hole; the salt leaching subsystem comprises a salt leaching kettle; the salt leaching kettle is provided with a middle salt feeding hole, a middle solution feeding hole and a bottom material outlet; and a fresh saturated sodium bicarbonate solution feeding pipeline is connected with a middle solution feeding hole of the salt leaching kettle through a solution feeding pump. The utility model solves the technical problems of high energy consumption, low product purity and greenhouse effect during purified terephthalic acid membrane concentrated water treatment. And high-purity sodium bicarbonate is recovered from the purified terephthalic acid membrane concentrated water under low energy consumption.

The invention belongs to the technical field of aluminum electrolysis waste recovery treatment, and particularly relates to a comprehensive utilization method for aluminum electrolysis waste. The method comprises the following steps: after crushing the aluminum electrolysis waste, reacting the crushed aluminum electrolysis waste with an alkaline solution to generate a mixed solution containing a sodium metaaluminate component and filter residues A; washing the filter residue A for multiple times, and extracting a sodium fluoride saturated solution and a filter residue B; heating and evaporating the mixed solution to separate out sodium fluoride; the pH value of the solution is adjusted through carbon dioxide, and a high-purity aluminum hydroxide and sodium carbonate solution is prepared; separating the washed mixed solution by adopting an electrochemical method to obtain a hydrogen fluoride / ammonium fluoride solution and a sodium hydroxide / sodium carbonate / sodium bicarbonate solution; reacting the filter residue B with dilute acid to prepare a lithium-containing solution, purifying and concentrating, adding sodium carbonate to precipitate lithium to prepare a lithium carbonate product, and reacting aluminum hydroxide with hydrogen fluoride to prepare high-purity aluminum fluoride. According to the method, comprehensive recovery of the aluminum electrolysis waste is achieved, environmental pollution is effectively reduced, and the utilization rate of resources is increased.

The utility model provides a tail gas treatment device for sodium nitrate production equipment by a neutralization method, which comprises a tail gas air pipe (20), an induced draft fan (2) and an exhaust funnel (6), a primary absorption tower (3) and a secondary absorption tower (4) which are connected in series with a reaction kettle (1) are communicated by the tail gas air pipe (20), an upper air outlet of the secondary absorption tower (4) is connected with the exhaust funnel (6), and the upper side of the exhaust funnel (6) is communicated with the atmosphere. And a sodium bicarbonate solution is sprayed in the first-stage absorption tower (3) and the second-stage absorption tower (4). The induced draft fan (2) is used for generating negative pressure in the reaction kettle (1), tail gas is sucked out, and the tail gas can be prevented from leaking from the sampling opening (11) and the simple manhole (12). The first-stage absorption tower (3) and the second-stage absorption tower (4) are used for spraying sodium bicarbonate to neutralize tail gas generated in the neutralization reaction, the treated tail gas does not contain nitric oxide any more, the treatment process is simple, consumed materials are few, and the cost is low.

The present invention provides an antibody fluorescent labeling kit and a labeling method thereof, the kit comprising the following raw materials: 0.4-0.6mg fluorescein isothiocyanate, 500-700μL dimethyl sulfoxide, 2.0-3.5mL labeling buffer, 1.5-2.5mL labeling preservation solution, 0.1-0.3mL sodium bicarbonate solution, 1 centrifugal column, 3 EP tubes. The labeling method of the present invention completes the fluorescent labeling of the antibody by the following steps: S1, preparing antibody solution, S2, adjusting the pH of the antibody solution, S3, preparing fluorescein isothiocyanate solution, S4, preparing markers, S5, centrifugal column balancing treatment, S6, preparing fluorescently labeled antibodies, S7, fluorescently labeled antibody dilution and preservation. The kit of the present invention can quickly and conveniently label antibodies, and there is no need to go through a dialysis step during the entire labeling process, thereby simplifying the labeling process, saving labeling time, and being both convenient and efficient. The fluorescently labeled antibody prepared by the present invention has high fluorescence intensity and strong stability, and can still maintain strong fluorescence intensity even after being stored for 12 months.

Provided is a method for producing a solution of atropine with improved recovery. A method for producing a solution of atropine-211, comprising the steps of: irradiating bismuth with alpha rays, generating atropine-211 in the bismuth, and distilling the bismuth irradiated with the alpha rays, separating and purifying atropine-211, and dissolving it in an aqueous sodium bicarbonate solution.

The present invention relates to the technical field of cumene hydroperoxide production, specifically to cumene hydroperoxide and its preparation method and application. Cumene is mixed with a composite stabilizer, hydrogen peroxide and TiO 2 -PW catalyst are added, and the reaction is carried out at 65 °C for 1.5 hours under nitrogen protection; then the temperature is raised to 85 °C and the reaction is carried out for 4 hours; the obtained reaction solution is cooled to 40 °C, and the catalyst is recovered by filtration; the aqueous phase is removed by liquid separation, and the organic phase is washed with 5% sodium bicarbonate solution until neutral; then the unreacted cumene is removed by vacuum distillation, and then treated by molecular sieve adsorption decolorization and ethanol recrystallization, and cumene hydroperoxide is obtained after drying. By using a composite stabilizer, the present invention effectively inhibits the decomposition of hydrogen peroxide, improves the stability of the reaction system, reduces the occurrence of side reactions, and improves the production efficiency.

The invention discloses high-activity high-titanium slag micropowder as well as a preparation method and application thereof, and belongs to the technical field of industrial solid waste resource utilization. The preparation method comprises the following steps: compounding alkaline industrial solid waste and an alkali activator into a composite alkaline modifier; grinding a high-titanium slag raw material, mixing the ground high-titanium slag raw material with the modifier, and carrying out high-temperature calcination treatment; carrying out carbonization treatment on the calcined product in a hot and stuffy tank by using a 20-40g / L sodium bicarbonate solution; and finally, carrying out filter pressing, drying and grinding to obtain the product. Through the synergistic effect of high-temperature modification, alkali fusion activation and carbonization treatment, an inert mineral phase in the high-titanium slag is reconstructed into a high-activity mineral phase, free calcium oxide is effectively eliminated, the 28d activity index of the obtained high-titanium slag micro-powder is not lower than 105%, the content of the free calcium oxide is lower than 0.5%, the stability is excellent, and the high-titanium slag micro-powder is suitable for being used as a high-titanium slag micro-powder. The mineral admixture can replace cement in a large proportion, and high-value utilization of the high-titanium slag is achieved.

The invention relates to the field of chemical production, and discloses a method for preparing 1, 3-cyclohexanedione. The method comprises the following steps: 1, dissolving a raw material A in a solvent, adding a raw material B into a constant-pressure dropping funnel, and dropwise adding the raw material B into a reaction system; continuously stirring and reacting at room temperature for 1 hour after dropwise adding; 2, after the reaction is finished, heating to 50 DEG C, adding the raw material C into a constant-pressure dropping funnel, and dropwise adding the raw material C into a reaction system; after dropwise adding, heating to reflux, continuously stirring and reacting for 6 hours, and extracting by using dichloromethane; sequentially washing the organic extract twice with water, a sodium bicarbonate solution and saline water, drying on anhydrous sodium sulfate, and finally removing the solvent to obtain a cyclization product; and 3, dropwise adding hydrochloric acid into the cyclization product, carrying out decarboxylation reaction, concentrating under reduced pressure to remove low-boiling-point byproducts, cooling to separate out the product, centrifuging, leaching with a small amount of ice water, pulping with ethyl acetate, filtering, and drying to obtain the 1, 3-cyclohexanedione product.

The invention relates to alpha-type aluminum oxide, a preparation method thereof and polishing powder, and belongs to the technical field of aluminum oxide. The method comprises the following steps: carrying out chemical reaction on a sodium bicarbonate solution and a Bayer process sodium aluminate solution to obtain seed slurry; mixing the seed slurry with the Bayer process sodium aluminate solution for decomposition reaction to obtain aluminum hydroxide with set granularity; carrying out first calcination on the aluminum hydroxide with a set particle size to obtain an aluminum oxide intermediate; washing the aluminum oxide intermediate; and carrying out second calcination on the washed aluminum oxide intermediate at a set temperature to obtain the alpha-type aluminum oxide. The alpha-type aluminum oxide prepared by the embodiment of the invention meets the following indexes: D50 is lt; 2 [mu] m, and (D90-D10) / D50 is lt; 2, the alpha phase is gt; the alpha-type aluminum oxide can be used as polishing powder for the precision polishing industry, uniform polishing is realized, and the quality of a polished surface is improved.

The invention relates to a production method and device for preparing ammonium / alkali through a microreactor, and belongs to the technical field of safety, environmental protection, energy conservation and water conservation. The method comprises the following steps: simultaneously feeding a saturated aqueous solution of sodium chloride and a sodium bicarbonate solution into a mixing zone for premixing, and feeding into a reaction zone for reaction through shunting to obtain a reaction mixed solution; crystallizing, filtering, washing and drying the reaction mixed solution to obtain sodium bicarbonate; performing crystallization, chemical sublimation, precipitation and recrystallization on the mother liquor obtained by filtering to obtain ammonium chloride, and recovering ammonia gas generated in the crystallization, chemical sublimation, precipitation and recrystallization processes of the mother liquor; calcining the sodium bicarbonate to obtain sodium carbonate, and recovering carbon dioxide released in the calcining process; the recovered ammonia gas, carbon dioxide and water are prepared into a sodium bicarbonate solution to be used as a reaction base solution. According to the invention, liquid-gas reaction is improved into liquid-liquid reaction, and the microreactors connected in series and in parallel are improved, so that the yield and purity of the product are improved.

The application discloses a self-sensing recycled aggregate cement stabilized macadam mixture and a preparation method thereof. The mixture comprises: aggregate, cement, liquid-solid carbonation modification solution and conductive component; wherein, the calcium chloride solution and sodium bicarbonate solution are used to replace mixing water and form calcium carbonate deposition products inside the mixture to regulate the pore structure and interface state of the recycled aggregate cement stabilized macadam mixture; the chopped carbon fiber is located in the mixture matrix after liquid-solid carbonation regulation and forms a conductive path with piezoresistive response characteristics, so that the mixture generates identifiable apparent volume resistivity change in the compression process. The application enables the mixture to maintain the basic road performance of the road base layer, generates identifiable apparent volume resistivity change in the compression process, is beneficial to damage feature point identification and electrical early warning before peak damage, and can be used for functional preparation of the recycled aggregate cement stabilized macadam base layer material.

The application belongs to the technical field of medicine synthesis, and particularly relates to a preparation method of furosemide. The preparation method of furosemide comprises the following steps: chlorosulfonation: reacting chlorosulfonic acid and 2,4-dichlorobenzoic acid, hydrolyzing, filtering, and obtaining 2,4-dichloro-5-sulfonyl chlorobenzoic acid; amination: adding 2,4-dichloro-5-sulfonyl chlorobenzoic acid into ammonia water, reacting, neutralizing, filtering, purifying, and obtaining 2,4-dichloro-5-sulfonamidobenzoic acid; condensation: reacting 2-furfurylamine and 2,4-dichloro-5-sulfonamidobenzoic acid, and obtaining furosemide crude product; decolorization: adding the furosemide crude product into a saturated sodium bicarbonate solution, adding activated carbon for decolorization, neutralizing, and crystallizing, and thus furosemide product is obtained. The raw material used in the application is easy to obtain and low in price, the comprehensive reaction period is short, the amount of hazardous waste generated is small, the prepared furosemide is high in purity and high in total yield, the comprehensive cost of the whole preparation process is low, and the application is suitable for industrial production.

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

The invention discloses a preparation method of lamellar lanthanum carbonate tetrahydrate powder crystals based on a microwave / ultrasonic technology, which comprises the following steps: (1) preparation of lanthanum carbonate octahydrate: slowly dropwise adding a sodium bicarbonate solution into a lanthanum chloride solution, and fully reacting at the reaction temperature of 30 DEG C for 2-5 hours; washing the final product with water, performing suction filtration, and drying to obtain lanthanum carbonate octahydrate powder; (2) preparing lamellar lanthanum carbonate tetrahydrate powder crystals, namely putting the lanthanum carbonate octahydrate powder prepared in the step (1) into a solvent medium at room temperature, and regulating different microwave intensities to carry out rapid dehydration treatment; and then stripping by means of high-frequency vibration of ultrasonic waves, centrifuging and drying to obtain a lanthanum carbonate tetrahydrate powder crystal product. Lanthanum carbonate tetrahydrate is prepared through dehydration with the microwave / ultrasonic technology, generation of basic lanthanum carbonate impurities can be avoided, the obtained lanthanum carbonate tetrahydrate is in a uniformly-dispersed sheet shape, and the purity of the lanthanum carbonate tetrahydrate reaches 99.5% or above.

The invention belongs to the technical field of oil well sealing cement, and particularly discloses a material for activating the repairing function of a self-repairing cement base and a preparation method thereof.The material comprises a rupturable hard shell, the rupturable hard shell is filled with a sodium bicarbonate solution, and a dilute sulphuric acid solution is wrapped in paraffin; and the paraffin coated with the dilute sulphuric acid solution is arranged in the rupturable hard shell filled with the sodium bicarbonate solution. Compared with the prior art, carbon dioxide is needed for the self-repairing cement to play a repairing role, and when the outside detects that an extraction drill hole has cracks, the material can provide carbon dioxide through mutual reaction of solutions to enable the self-repairing cement to generate a repairing product to block the cracks.

The invention relates to the technical field of aluminum hydroxide preparation, in particular to a method for preparing superfine aluminum hydroxide particles and the superfine aluminum hydroxide particles. The method comprises the following steps: mixing a supersaturated sodium bicarbonate solution and a first Bayer process sodium aluminate solution to obtain a seed slurry containing amorphous aluminum hydroxide; wherein the solid content of the amorphous aluminum hydroxide is greater than 30g / L; and performing decomposition reaction on the second Bayer process sodium aluminate solution and the seed slurry containing the amorphous aluminum hydroxide to obtain decomposed slurry containing the superfine aluminum hydroxide particles. According to the method, the morphological characteristics of an aluminum hydroxide product generated by decomposing a sodium aluminate solution are accurately regulated and controlled on the basis of the characteristics of a large number of disordered structures of amorphous aluminum hydroxide, so that the median particle size of aluminum hydroxide particles is 0.3 mu m or less, the specific surface area is up to 15 m < 2 > / g-30 m < 2 > / g, the oil absorption is 35 mL / 100 g-45 mL / 100 g, and the weight content of caustic alkali is 0.2% or less.

The invention relates to a process for producing scandium oxide by comprehensively recovering bauxite. According to the method, scandium compounds in the red mud are activated through bubbling treatment, the pH value of a liquid phase is smaller than or equal to 10.5, after multi-stage filtration, insoluble residues are leached through a sodium carbonate-sodium bicarbonate solution, and a scandium-containing sodium carbonate-sodium bicarbonate solution is obtained; after filtering the obtained solution, mixing a scandium-containing alkaline aluminate solution with a scandium-containing sodium carbonate-sodium bicarbonate solution to prepare a scandium-containing hydrolysis concentrate; carrying out two-stage sulfuric acid leaching on the filtered scandium-containing hydrolysis concentrate; the scandium-containing sulfuric acid solutions obtained after two-stage leaching are mixed, alkali is added to adjust the pH to 4.5-5.5, and scandium sulfate without impurity elements is precipitated; then treating with caustic alkali until the pH is not more than 5.6, and carrying out selective precipitation of scandium; treating scandium sulfate with a sulfuric acid solution to obtain basic scandium sulfate; treating the obtained basic scandium sulfate with oxalic acid to convert the basic scandium sulfate into scandium oxalate; filtering the obtained scandium oxalate precipitate; and calcining scandium oxalate to remove carbon and obtain scandium oxide, wherein the content of Sc2O3 in the calcined product is at least 99.0 mass percent.

The present application relates to the field of horizontal well coalbed methane production, in particular to a method for increasing the yield of coalbed methane by deep foam displacement in horizontal well, which is suitable for coalbed methane well with long horizontal section, difficult to discharge residual acid slag and poor deep acid washing effect. The method comprises the following steps: running the well flushing pipe column to the deepest part of the horizontal well, continuously injecting acid liquid and foam stabilizer compound solution into the oil pipe, using the retreating type well flushing technology to flush acid in sections until the last acid washing well section, shutting down the well to maintain acid pressure after the pump pressure is stable, carrying out acid immersion operation for 8 hours, running the oil pipe to inject sodium bicarbonate solution, and then carrying out sectional alkali injection after the pump pressure is stable. The alkali water reacts with the residual acid liquid to generate carbon dioxide gas and release heat, the foam stabilizer reduces the gas-liquid surface tension, a large amount of foam is generated to carry the residual slag out of the oil jacket annulus and the wellbore passage, and the generated inorganic salt is beneficial to the wetting and solution stability of the residual slag. The method solves the problem of difficult discharge of residual acid slag in deep acid washing of horizontal well, makes the acid washing effect more thorough, and the flowback efficiency is higher.

The application discloses HPVC power cable protection pipe and a preparation method thereof, and relates to the technical field of cable protection pipes.The HPVC power cable protection pipe comprises the following raw materials by weight: 100 parts of high-strength polyvinyl chloride, 35-45 parts of epoxy-type acrylate rubber, 5-8 parts of vinyl chloride-g-acrylate copolymer, 8-12 parts of epoxy soybean oil, 3-5 parts of calcium-zinc composite stabilizer, 5-15 parts of modified hydrotalcite, 0.1-0.5 parts of beta-diketone, 0.8-1.5 parts of calcium stearate, 10-20 parts of flame retardant, 12-15 parts of modified nano calcium carbonate, 5-8 parts of talcum powder, 0.6-1.2 parts of antioxidant, 1-2 parts of anti-aging agent 4010 and 0.5-1.5 parts of ultraviolet absorber UV531; the modified hydrotalcite is obtained by adding a mixed solution of calcium nitrate and lanthanum nitrate, a sodium hydroxide solution and a sodium bicarbonate solution into a sodium dodecyl sulfate solution, mixing and aging, and then performing a post-treatment process.The HPVC power cable protection pipe prepared by the application has high strength, good mechanical properties, weather resistance and cold resistance, and a long service life.

The invention provides basic cobalt carbonate with high carbonate content and a preparation method thereof, and belongs to the technical field of cobalt compound preparation. The basic cobalt carbonate can be used as a cobalt source or a cobalt compound precursor for a positive electrode material. The method comprises the following steps: introducing carbon dioxide into a sodium carbonate solution in advance to obtain a pre-carbonized sodium carbonate solution; synchronously dropwise adding the pre-carbonized sodium carbonate solution and the cobaltous sulfate solution for reaction under the condition of partial pressure of carbon dioxide, and controlling the pH value of the reaction solution to obtain reaction slurry; aging the reaction slurry under a carbon dioxide pressurization condition, regulating the pH value, and filtering to obtain a wet filter cake; the wet filter cake is sequentially subjected to sodium bicarbonate solution replacement washing and carbon dioxide saturated deionized water washing, then dried, smashed and screened, and a product is obtained; the method disclosed by the invention is beneficial to improving the carbonate introduction degree of basic cobalt carbonate and reducing soluble salt entrainment, and few insoluble residues are generated in acid medium dissolution evaluation.