174 results about "Acidification - Treatment" patented technology

The invention discloses a biomass nitrogen-doped derivative porous carbon material and a preparation method and application thereof, and belongs to the technical field of photo-thermal atmospheric water catching.The preparation method comprises the following steps that a carbon source and a nitrogen source are put into water to be subjected to an ultrasonic reaction, a reactant is subjected to hydrothermal treatment, and a solid product is obtained; carrying out steam etching and high-temperature annealing treatment on the solid product and metal salt in an inert atmosphere, and then sequentially carrying out acidizing treatment, grinding and drying to prepare the biomass nitrogen-doped derived porous carbon material. The biomass nitrogen-doped derivative porous carbon material prepared by the method has a rich pore structure and efficient adsorption-desorption performance, can replace an expensive MOFs material, optimizes the preparation path, improves the nitrogen doping efficiency and the material stability, remarkably reduces the cost and the environmental burden while ensuring the excellent atmospheric water collection performance, and has a wide application prospect. And the method shows more excellent industrialization prospects and sustainable development values.

The invention discloses a low-permeability sandstone water locking-water sensitivity synergistic plug removal deep acidizing treatment method which is suitable for a low-permeability sandstone reservoir in an offshore high-temperature and high-pressure environment (120 DEG C, 40 MPa). According to the method, acidizing fluid is adopted, and the acidizing fluid is prepared from 18%-22% of chelating type composite organic multi-element retarded acid HWCP, 1.5%-2.5% of clay stabilizer HTW, 1.5%-2.5% of waterproof locking agent HAR, 18%-22% of pressure reduction cleanup additive HWDA, 5%-7% of corrosion inhibitor HWCI and the balance filtered seawater. The acidizing fluid is prepared by stirring at normal temperature and normal pressure, and stays for 6-12 hours after being injected into a reservoir. The HWCP slowly dissolves blockages, and the acting distance reaches 11 m; the HTW anti-swelling rate is greater than or equal to 90%, and clay expansion is inhibited; the HAR prevents water blocking; secondary precipitation is reduced through HWDA; and the corrosion rate is controlled to be 15.1108 to 26.1274 g / m < 2 >. H through HWCI. According to the method, the permeability of the reservoir is recovered by 122.09%-627.1%, the yield-increasing multiple ratio is 1.60-2.91, and the high efficiency is verified through 7-well-number field application. The method is simple in process, adapts to the marine environment, and comprehensively solves the problems of water locking, water sensitivity and secondary precipitation.

The invention discloses a thickening suspending agent containing modified attapulgite and application of the thickening suspending agent, and belongs to the technical field of thickening suspending agents. After acidification treatment, the content of impurities on the surface of attapulgite is reduced, the surface area and the porous property are increased, the load rate of zero-valent iron can be increased, and the utilization rate of the zero-valent iron is increased. Zero-valent iron is uniformly loaded on tubular pore channels or the surface of attapulgite in the form of nano-particles, so that the surface roughness of the composite powder is increased, stronger steric hindrance can be formed around pesticide particles, and the pesticide particles are prevented from being gathered and enlarged due to collision, so that sedimentation is reduced, and the composite powder has good suspension property and dispersity; the load of zero-valent iron can endow the thickening suspending agent with the heavy metal chelating capability; through two times of intercalation treatment, the modified zero-valent iron composite attapulgite powder can be uniformly loaded between graphene oxide layers, the graphene oxide can assist the dispersion of the attapulgite to avoid agglomeration, and the existence of the graphene oxide can improve the thermal stability of the thickening suspending agent.

The invention provides a purification method and application of a coal-based hard carbon material, belongs to the technical field of lithium / sodium ion battery negative electrode materials, and overcomes the defects that according to an existing purification method, the ash content is lower than 3%, the iron content is lower than 400 ppm, and the requirements are difficult to meet. Turning over the materials and reacting for 3.8-4.2 hours in a boiling state; acidizing: mixing an acid solution, and reacting for 2-8 hours at the temperature of 60-100 DEG C; the mixed acid solution comprises hydrochloric acid with the volume concentration of 10%-30% and hydrofluoric acid with the volume concentration of 0.5%-8%; according to the high-purity coal-based hard carbon material and the preparation method thereof, purification and deep impurity removal can be cooperated, the original coal ash content higher than 8% can be reduced to lower than 1%, and the iron content of the high-purity coal-based hard carbon material is lower than 100 ppm.

The invention belongs to the technical field of fuel cell membrane electrode preparation, and particularly discloses a preparation method for improving fuel cell catalyst layer ionomer distribution, which comprises the following steps: placing a carbon nanotube in dilute nitric acid, carrying out uniform ultrasonic dispersion, then carrying out oil bath heating, carrying out continuous acidification treatment, then carrying out suction filtration, and drying to obtain a carbon nanotube catalyst layer; carbon nano tube powder subjected to acidizing treatment is obtained; mixing the acidized carbon nanotube powder with a Nafion solution in proportion, and removing a solvent through rotary evaporation to obtain a carbon nanotube-Nafion compound; mixing the carbon nanotube-Nafion compound with a commercial Pt / C catalyst, deionized water and ethanol in proportion, and performing ultrasonic treatment under an ice bath condition to obtain uniformly dispersed cathode catalyst slurry; and spraying the uniformly dispersed cathode catalyst slurry on the cathode side of the proton exchange membrane to obtain the catalyst layer for improving ionomer distribution.

A low capital and environmentally friendly process of extracting materials from slurries. The method includes adjusting a unique parameter determined based on the modified alkalinity in a quantity of the slurries to a preset value independent of the pH. Interactions of the anionic reactant species with lithium within the slurries causes a solid form of the material to precipitate out of the slurries. After the solid separation, the spent liquid may be returned to underground surface water systems or transported to a storage.

The invention discloses a high-purity and low-damage single-walled carbon nanotube purification method which comprises the following steps: carrying out mechanical shearing treatment on a single-walled carbon nanotube to disperse the single-walled carbon nanotube and open a tube bundle structure to obtain a sheared single-walled carbon nanotube; carrying out pre-oxidation on the sheared single-walled carbon nanotube in a weak oxidizing atmosphere to obtain a pre-oxidized single-walled carbon nanotube; carrying out microwave treatment on the pre-oxidized single-walled carbon nanotube or the acidified single-walled carbon nanotube in an inert atmosphere to obtain a single-walled carbon nanotube subjected to microwave treatment; and acidizing the single-walled carbon nanotube subjected to microwave treatment to obtain the acidized single-walled carbon nanotube. The method is simple in process, mild in condition, easy to amplify and suitable for industrial production. The purity of the obtained single-walled carbon nanotube is higher than 99%, the raman spectrum IG / ID ratio is larger than 150 and higher than that before purification, and the single-walled carbon nanotube is high in structural integrity and suitable for the fields of high-performance composite materials, electronic devices, energy storage and the like.

This application discloses a biochar-supported silicate composite material, its preparation method, and its application. The preparation method includes the following steps: mixing an inorganic acid solution with biomass, stirring the resulting mixture at 85℃~95℃ until it evaporates to dryness, to prepare acidified biomass; mixing the acidified biomass with a silicate precursor solution to prepare an acidified biomass-supported silicate composite material; and carbonizing the acidified biomass-supported silicate composite material to obtain the biochar-supported silicate composite material. The preparation method of this application, by pre-treating the biomass with a specific acidification process, enables the prepared biochar-supported silicate composite material to achieve both short-term removal of cationic heavy metals and long-term soil stability, and it exhibits good remediation effects on cationic heavy metals in different occurrence forms.

The invention discloses a coffee fresh fruit primary processing wastewater treatment process and a wastewater treatment system, and belongs to the technical field of wastewater treatment. The method comprises the following steps: preliminarily filtering coffee processing wastewater; feeding the preliminarily filtered wastewater into a polysaccharide reactor, adjusting the pH value to 7-9, stirring, and flocculating and precipitating to complete pretreatment; s3, carrying out regulation-hydrolytic acidification on the pretreated coffee wastewater, carrying out hydrolytic acidification on macromolecular organic substances in the wastewater, and standing for solid-liquid separation; s4, carrying out oxidation-reduction reaction on the coffee wastewater subjected to hydrolytic acidification treatment; then carrying out anaerobic reaction on the coffee wastewater subjected to the micro-electrolysis reaction to degrade organic matters, and carrying out three-phase separation on solid, liquid and gas; then carrying out an anoxic / aerobic reaction on the coffee wastewater subjected to the anaerobic reaction treatment; and then carrying out ozone / UV catalytic oxidation on the coffee wastewater after the nitrification anoxic / aerobic reaction. According to the method, microelectrolysis and biological treatment processes are combined, the acidic polysaccharide and pectin comprehensive wastewater belongs to high-difficulty wastewater, and pollutants in high-concentration coffee fresh fruit primary processing wastewater are effectively degraded.

The application provides an antimony-based composite negative electrode material and a preparation method and application thereof, and relates to the technical field of new energy batteries.The preparation method provided by the application comprises the following steps: mixing antimony metal powder with amorphous carbon, ball-milling, drying and calcining to obtain an antimony-based intermediate; performing acidification treatment on the surface of carbon nanotubes to obtain acidified carbon nanotubes, dispersing the acidified carbon nanotubes in an organic sodium modified solution, stirring, filtering, drying to obtain modified carbon nanotubes; mixing and dispersing the antimony-based intermediate, sodium polyacrylate and the modified carbon nanotubes to obtain a suspension, and then performing spray drying to obtain the antimony-based composite negative electrode material.The preparation method provided by the application can improve the problem of performance decline caused by the capacity attenuation of the antimony metal due to the huge volume expansion in the process of deintercalating sodium ions, and effectively improves the electrochemical performance of the antimony-based negative electrode material.

The application belongs to the technical field of capacitive deionization desalination, and relates to an electrode felt for capacitive deionization and a preparation method thereof. The preparation comprises the following steps: dissolving PAN and acetylated lignin into a homogeneous spinning solution by using DMF and DMSO double solvents, and then electrospinning to obtain a carbon fiber precursor; then, under a nitrogen atmosphere, the precursor is subjected to pre-oxidation, carbonization and CO2 activation treatment; finally, the obtained material is subjected to acidification treatment to obtain the electrode felt for capacitive deionization with a high specific surface area. The method has a wide raw material source and low cost. The specific pre-oxidation, carbonization and carbon dioxide etching process are combined with each other, so that the prepared electrode felt has a high specific surface and a high capacitive deionization effect.

The invention relates to the technical field of organic waste resource utilization, and discloses a method for co-production of lactic acid and crude grease by using perishable garbage, and the method comprises the following steps: step a, preparing the perishable garbage into slurry; b, feeding the slurry into an electrochemical reactor for electrochemical treatment; c, carrying out acidification treatment on the generated fatty acid salt to recover crude oil; and step d, carrying out lactic acid fermentation on the residual liquid rich in the small molecular sugar after the crude oil is recovered to obtain the lactic acid. The anode region and the cathode region which are separated by the ion selective diaphragm are arranged in the electrochemical reactor, and acid and alkali are respectively generated in situ in the two regions by utilizing water electrolysis and are directly used for hydrolysis of polysaccharide and saponification of grease, so that chemical reagents such as sulfuric acid and caustic soda do not need to be additionally added; the introduction of extra impurity ions such as sulfate radicals and sodium ions into the system is avoided, the load of subsequent product separation and wastewater treatment is reduced, and the process flow is simplified.

The invention discloses a magnetic nanoparticle anchored heterogeneous carbon-based heat-conducting and wave-absorbing integrated material and a preparation method thereof, and belongs to the field of functional composites.The preparation method comprises the steps that melamine foam is acidized, and then acidized MF is soaked into a zinc salt, cobalt salt and 2-methylimidazole methanol solution; the obtained MF (at) ZnCo-ZIF is subjected to high-temperature calcination, and the heterogeneous carbon-based heat conduction and wave absorption integrated material anchored by the Co magnetic nanoparticles is obtained. The Co magnetic nanoparticle anchored heterogeneous carbon-based heat-conducting and wave-absorbing integrated material has the advantages of controllable morphology, high heat conductivity and strong wave-absorbing performance through the synergistic strengthening effect of the high-graphitization heterogeneous carbon material with high heat / conductivity and high dielectric loss and the Co magnetic nanoparticles with high magnetic conductivity and high magnetic loss; actual requirements of different scenes can be met, and a new thought is provided for research and development of a high-performance heat-conducting and wave-absorbing integrated material.

The invention discloses a method suitable for on-site analysis of the valence state of thallium in water. The method comprises the following operation steps: step 1, collecting and separating a water sample; step 2, acidizing treatment; 3, Tl (I) and Tl (III) are separated; 4, total thallium is measured; step 5, Tl (I) determination; the invention relates to the technical field of atomic spectrum metal element analysis, and the method has the beneficial effects that by combining an electrochemical separation technology with a Chelex-100 solid-phase extraction column and cooperating with a portable liquid cathode glow discharge thallium measurement instrument, high-sensitivity field detection of Tl (I) and Tl (III) is realized, the detection limit is lower than 1.0 g / L, and the repeatability is RSDlt; the analysis period of a single sample is less than or equal to 30 minutes, the weight of equipment is only 5kg, battery power supply is supported, and acidification-separation-detection integrated operation can be completed outdoors without professional laboratory conditions.

The invention provides a method for determining the tin content in fuming furnace waste residues through composite alkali fusion ICP-AES, and belongs to the technical field of chemical analysis and testing. The fuming furnace waste residues to be treated are taken, a composite alkali flux is added into the fuming furnace waste residues to be treated and mixed to be uniform, and the composite alkali flux is a mixture of sodium peroxide and sodium carbonate; the method comprises the following steps: heating a mixture containing fuming furnace waste residues and a composite alkali flux to 400-700 DEG C, and carrying out gradient melting; after fusion is completed, transferring a melt into water for leaching, acidizing a product obtained by leaching, filtering, and fixing the volume of filtrate to obtain a solution to be detected; and preparing a standard solution and a blank solution, determining in an inductively coupled plasma emission spectrometer, and obtaining the tin content in the fuming furnace waste residue according to the obtained working curve. The method is applied to determination of low tin content, and the tin content in the tin-containing waste slag of the fuming furnace can be rapidly and accurately determined.

The invention relates to a biomass low-temperature carbonization accelerant as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out water washing pretreatment on powder obtained by crushing a biomass raw material, and then carbonizing in an inert atmosphere to obtain biomass carbon powder; acidizing the biomass carbon powder to obtain carbon-based solid acid; the carbon-based solid acid and a transition metal salt auxiliary agent are mixed and ground, and the biomass low-temperature carbonization accelerant is prepared. The biomass low-temperature carbonization accelerant is a composite catalyst composed of carbon-based solid acid and transition metal salt; wherein the carbon-based solid acid is used as a main catalytic substrate, provides abundant Bronsted acid loci-SO3H, and is mainly used for catalyzing the dehydration reaction of biomass; transition metal ions are used as Lewis acid sites and generate a synergistic effect with the carbon-based solid acid to jointly catalyze depolymerization, dehydrogenation and aromatization reactions, so that deep carbonization can be initiated and completed at a relatively low temperature of 250-400 DEG C, and the carbonization rate is remarkably higher than that of an existing carbonization catalyst.

The invention relates to the technical field of attapulgite, and provides ultrasonic-thermal activated attapulgite applied to organic wastewater and a preparation method thereof, the preparation method comprises the following steps: pretreating attapulgite raw ore, mixing the pretreated attapulgite raw ore with water, carrying out ultrasonic activation, filtering, calcining, carrying out thermal activation, and optionally carrying out acidizing treatment; according to the method, through the synergistic effect of ultrasonic cavitation and heat treatment, fiber bundles of attapulgite are effectively stripped, impurities are removed, and a developed hierarchical pore structure and surface acid sites are formed; the obtained activated attapulgite has excellent adsorption performance on organic pollutants, and is especially suitable for treating complex wastewater containing aromatic organic matters and cationic dyes at the same time; when the adsorbent is applied, the adsorbent is added into wastewater, synchronous and efficient removal of pollutants can be realized after stirring adsorption is performed under proper conditions, and the saturated adsorbent can be regenerated and reused through high-temperature calcination. The method is simple in process, low in cost, high in adsorption efficiency and environment-friendly.

The present application relates to a kind of high alkalinity wastewater pre-acidification treatment method and its processing device system, the treatment method includes: the nutrient substance is added to the wastewater to be treated and is adjusted to obtain adjusted water;Part of the adjusted water is returned to adjust and handle, another part is added to the nutrient substance and is pre-acidification treatment, obtain pre-acidification water;Pre-acidification water is treated by anaerobic purification, obtain anaerobic purification water;Anaerobic purification water is treated by aeration and sedimentation in turn, obtain treated water.The treatment method and its processing device system provided by the present application can regulate the metabolic activity of microorganism, reduce the inhibitory effect of wastewater alkalinity and metal ions on anaerobic microorganism, improve the anaerobic removal rate of anaerobic purification treatment, reduce the adding cost of acidic substance and nutrient substance.

The present application relates to a kind of preparation methods of high loft polyester composite fiber, with nano calcium carbonate blend reinforced modified polymer as skin layer component, PET, PTT or PBT as core layer component, after spinning, winding using sheath-core spinning process, sequentially through preliminary drawing, acidification treatment, directional hot air treatment, cooling setting, re-drawing high loft polyester composite fiber is prepared;The melting point of skin layer component is lower than core layer component;Acid liquor is one or more above in dilute sulfuric acid, dilute hydrochloric acid and dilute nitric acid with pH 2.5-3.5;The present application utilizes the chemical property of nano calcium carbonate in acid liquor and forms porous structure, under the double influence of gas external force and porous structure, the degree of three-dimensional crimping inside sheath-core composite fiber is further increased, and then the crimping performance, loft performance, mechanical property and moisture absorption and quick drying performance of composite fiber are improved, and the overall process is simple and controllable.

The invention provides an on-line volatile fatty acid monitoring system for water quality, which can effectively eliminate or reduce the influence of main interferents such as ammonia nitrogen to the greatest extent, realizes high-precision, high-selectivity and full-automatic on-line continuous monitoring, and has good economical efficiency and stability. The system comprises: a sampling and pretreatment unit, which is used for extracting a water sample and removing solid particles and suspended solids in the water sample through an on-line filtering device; the ammonia nitrogen separation unit is used for carrying out first distillation stripping operation on the pretreated water sample; the VFA separation unit is used for acidizing the water sample from which ammonia nitrogen is removed, and then carrying out secondary distillation stripping operation in an accurately controlled acidic environment; the VFA quantifying unit is used for absorbing VFA steam separated from the secondary distillation process by using quantitative set absorption liquid, measuring the conductivity change and real-time temperature of the absorption liquid before and after absorption through a sensor, and calculating the VFA concentration based on the change; and a control and data processing unit.

The application discloses biomass nitrogen-doped derived porous carbon material and a preparation method and application thereof, and belongs to the technical field of photo-thermal atmospheric water collection. The preparation method comprises the following steps: placing a carbon source and a nitrogen source into water for ultrasonic reaction, and performing hydrothermal treatment on the reactants to obtain a solid product; performing vapor etching and high-temperature annealing treatment on the solid product and a metal salt in an inert atmosphere, and then sequentially performing acidification treatment, grinding and drying to prepare the biomass nitrogen-doped derived porous carbon material. The biomass nitrogen-doped derived porous carbon material prepared by the method has rich pore structure and high adsorption-desorption performance, can replace expensive MOFs material, optimizes a preparation path, improves nitrogen-doping efficiency and material stability, significantly reduces cost and environmental burden while guaranteeing excellent atmospheric water collection performance, and has a more superior industrialization prospect and sustainable development value.

The invention provides a method for removing heavy metals in wastewater containing heavy metal complexes, which comprises the following steps: acidizing the wastewater containing the heavy metal complexes until the pH value is less than 7.0, mixing the wastewater containing the heavy metal complexes with reduced iron powder and a sodium hypochlorite solution, carrying out catalytic oxidation reaction for decomplexing, and then carrying out precipitation treatment to remove the heavy metals. According to the method for removing the heavy metals in the wastewater containing the heavy metal complexes, the heavy metals in the wastewater containing the heavy metal complexes are efficiently removed, the removal efficiency can reach 85% or above, the sludge yield is obviously reduced, the slag rate can be reduced to 2.2% or below, and the method is simple in technological process, environmentally friendly and low in cost.

The application discloses a kind of multi-channel high-conductive porous carbon material, preparation method and application thereof, preparation method includes the following steps: S1 carbon nanotube acidification treatment obtains carboxylated carbon nanotube, short carboxylated carbon nanotube is obtained after emulsification treatment, again with nitrogenizing agent is mixed evenly, wash to neutral, obtain functionalized carbon nanotube mixed solution A;S2 phenolic monomer, aldehyde monomer and alkaline solution are mixed, and phenol formaldehyde resin oligomer is condensed and polymerized, then mixed with functionalized carbon nanotube mixed solution A, stir evenly, obtain functionalized carbon nanotube-phenol formaldehyde resin precursor mixed solution B;S3 functionalized carbon nanotube-phenol formaldehyde resin precursor mixed solution B is dried to obtain porous carbon dry powder C;S4 porous carbon dry powder C is heated to 800-1200 DEG C, and CO2 is activated by being imported, and after cooling, obtain multi-channel high-conductive porous carbon material.The multi-channel high-conductive porous carbon material obtained by the preparation method provided by the application, carbon nanotube is more evenly dispersed therein, and the specific surface area is larger, and the conductivity is better.

This invention relates to the field of coal mine safety, specifically to a method for predicting the risk of hydrogen sulfide outbursts in coal seams. Currently, manual sampling for hydrogen sulfide gas detection in domestic mines is highly dangerous; furthermore, dissolved hydrogen sulfide is corrosive to mechanical measuring devices, resulting in low efficiency and the need for corrosion protection. This invention first determines the presence of geological water in the coal seam. If geological water is present, a small amount is deacidified and then tested with lead acetate test paper. If no geological water is present, a safe pH range is determined through mathematical statistics. While drilling into the coal seam at the measurement location in the tunneling face or return airway, the borehole flushing fluid is recovered, the pH value is measured, and the average value is calculated and compared with the safe pH range to determine whether there is a risk of hydrogen sulfide outbursts in the coal seam. This invention is highly practical in underground operations, highly safe, simple to operate, low in cost, and provides rapid and timely results, effectively ensuring the safety of underground workers and the safe and efficient production of coal mines.

The invention provides a method for detecting the content of proinflammatory regression factors (SPMs) in microalgae oil, which comprises the following steps: adding an isotope internal standard substance into a prepared microalgae oil sample to obtain an internal standard sample solution, adding an alkaline reagent into the internal standard sample solution, and carrying out saponification hydrolysis reaction to obtain an alkaline saponification hydrolysis solution; adding an acidic reagent into the alkaline saponification hydrolysis solution, carrying out acidification treatment, and adjusting the alkaline saponification hydrolysis solution to be acidic to obtain an acidified hydrolysis solution; sequentially purifying, concentrating and redissolving the acidified hydrolysis solution to obtain a solution to be detected; performing UPLC-MS / MS detection on the solution to be detected to respectively obtain a first response value of the target component and a second response value of the isotope internal standard substance; and calculating the content of the target component in the microalgae oil sample according to the first response value, the second response value and an internal standard method standard curve. Therefore, the accurate content of the SPMs in the sample can be obtained, and the detection accuracy is improved.

The invention provides an ilmenite collecting agent and a preparation method and application thereof, and relates to the technical field of mineral flotation separation. According to the preparation method, the ilmenite collecting agent can be efficiently and stably prepared by performing a hydroximation reaction on the cycloalkane carboxylic acid methyl ester compound and the free hydroxylamine solution and combining a preparation process of methanol separation treatment, acidification treatment and freeze-drying treatment; the preparation method is simple and easy to operate, large-scale production is easy, and great innovation is brought to large-scale obtaining of high-grade and high-recovery-rate concentrates through a flotation process of oxidized minerals. The molecular formula of the ilmenite collecting agent is Cn + 1H2n + 1O2N; or is Cn + 2H2n + 2O2N (n is an integer from 3 to 10). And the method can show remarkable advantages in ilmenite flotation. The high-temperature-resistant environment-friendly paint can keep excellent performance under the conditions of different pH values and temperatures, is high in adaptability and low in toxicity, and meets the environment-friendly requirements of green mines.

The invention relates to the field of organic soil, and particularly discloses drilling fluid organic soil and a preparation method thereof. The preparation method of the drilling fluid organic soil comprises the following steps: crushing calcium bentonite to prepare slurry, adjusting the pH value to 5-6, and acidizing to obtain activated bentonite slurry; adding urea accounting for 10-30% of the mass of the calcium bentonite into the activated bentonite slurry, and carrying out primary intercalation reaction to obtain primary intercalated bentonite slurry; and adding a secondary intercalator accounting for 5-20% of the mass of the calcium bentonite into the primary intercalation bentonite slurry, carrying out a secondary intercalation reaction, and carrying out filter pressing and drying to obtain the organic soil for the drilling fluid. The drilling fluid organic soil has the advantages of being wide in raw material source, low in cost and easy to produce and operate.

The invention relates to the technical field of inorganic non-metallic materials, in particular to a composite material for low-carbon steel protection and a preparation method of the composite material. The composite material comprises a highly carbonated active component and a highly hydrated active component, the preparation method adopts a two-stage synergistic process: in the first stage, carrying out accelerated carbonation treatment in a CO2-rich environment, so that gamma-C2S on the surface layer of the material forms a compact calcium carbonate shell layer; and a second stage, under a wet curing condition, hydrating the non-carbonated cement clinker in the inner core area protected by the outer shell layer to generate sufficient calcium hydroxide, and reconstructing and maintaining a high-alkalinity passivation environment around the reinforcing steel bar. According to the invention, by constructing a core-shell structure of physical shell-chemical core, rapid storage of CO2, early reinforcement of the material and endogenous and long-acting protection of the reinforcing steel bar are synchronously realized, the problem of corrosion of the reinforcing steel bar caused by low alkalinity of the carbon mineralized cementing material is effectively solved, and the application of the carbon mineralized cementing material in structural engineering is promoted.

This application relates to the field of capacitive deionization technology, and particularly to an electrode for capacitive deionization and its preparation method. The electrode for capacitive deionization comprises an electrode material, a carbon material, and a binder. The electrode material is DHPZ. The preparation method of DHPZ includes the following steps: S1, preliminary reaction: 2,5-dihydroxy-1,4-benzoquinone and 2,3-diaminophenazine are ground and mixed, heated in an inert gas atmosphere, cooled, filtered, washed, and vacuum dried to obtain a primary product; S2, acidification treatment of the primary product: The primary product is mixed with 2 mol / L nitric acid at a mass-to-volume ratio of 1:1, magnetically stirred for 5 hours, filtered, washed with deionized water, centrifuged multiple times, and vacuum dried at 60°C for 15 hours to obtain the DHPZ. This application provides an electrode for capacitive deionization and its preparation method to solve the problems of low desalination capacity, low adsorption capacity, and low removal efficiency in related capacitive deionization technologies.