2620 results about "Hydroxide" patented technology

The invention relates to the technical field of cables, and provides a fireproof flame-retardant 10kV power cable and a preparation method thereof. The fire-resistant flame-retardant 10kV power cable comprises a conductor and a fire-resistant flame-retardant layer, the fireproof flame-retardant layer is prepared from the following raw materials in parts by weight: 35 to 45 parts of linear low-density polyethylene, 40 to 50 parts of ethylene-vinyl acetate copolymer, 25 to 30 parts of modified aluminum hydroxide, 5 to 8 parts of polyethylene grafted maleic anhydride, 10 to 12 parts of phosphate modified halloysite nanotube, 5 to 8 parts of ZIF-8 loaded zinc borate core-shell particles, 15 to 20 parts of magnesium hydroxide and 2 to 3 parts of silane coupling agent. 0.5 to 1 part of antioxidant, 0.5 to 1 part of calcium stearate and 1 to 1.5 parts of polyethylene wax. According to the cable prepared in the invention, the situation that a conductor is exposed and the fire resistance is lost due to cracking and falling under long-time high-temperature baking is avoided; the continuous effectiveness of the flame retardant at high temperature is improved.

The invention discloses an environment-friendly high-strength water-stop belt and a preparation method thereof, and relates to the technical field of high-molecular compound composition water-stop belts. The environment-friendly high-strength water-stop belt is prepared from the following components in parts by mass: 100 parts of ethylene propylene diene monomer, 40 to 70 parts of reinforcing filler, 10 to 25 parts of environment-friendly plasticizer, 1 to 5 parts of interface modifier, 1.5 to 3.5 parts of vulcanizing agent, 3 to 8 parts of active agent, 1 to 3 parts of anti-aging agent and 5 to 15 parts of flame retardant. White carbon black and calcium carbonate are adopted as reinforcing filler to replace traditional carbon black, and energy consumption and pollution emission in the production process are remarkably reduced. By optimizing the formula and the preparation process, the tensile strength, the elongation at break, the tearing strength and other mechanical properties of the waterstop are remarkably improved. Aluminum hydroxide is added as a flame retardant, absorbs heat during thermal decomposition and forms a barrier layer, so that oxygen is effectively diluted, and fire spreading is prevented.

The present invention provides a polyphenylene sulfide resin and a method for preparing the same, the polyphenylene sulfide resin being obtained by measurement based on gel permeation chromatography using polystyrene as a conversion reference, in a differential molecular weight distribution curve using the logarithm value ln (M) of the molecular weight M as the horizontal axis and dw / dln (M) obtained by differentiating the concentration percentage w by the logarithm value ln (M) of the molecular weight as the vertical axis, the ratio of the value obtained by integrating dw / dln (M) at 6.90 < = ln (M) < = 9.21 with respect to the value obtained by integrating dw / dln (M) over the entire range of ln (M) is less than 5%. The preparation method of the polyphenylene sulfide resin is characterized in that a sulfur source, an alkali metal hydroxide and a dihalo aromatic compound are used as raw materials and subjected to a polymerization reaction in an organic polar solvent, and when the conversion rate of the dihalo aromatic compound is larger than 50%, materials passing through an external circulation pipeline are in a turbulent flow state so as to strengthen the mixing effect of a polymerization system; the polyphenylene sulfide resin can be prepared with high yield by inhibiting the generation of oligomer ultrafine powder waste. The method provided by the invention can significantly reduce the generation amount of oligomer ultra-micro powdery waste in the polyphenylene sulfide polymerization process.

The invention belongs to the technical field of synthesis of magnesium hydroxide flame retardants, and provides a synthesis method and flame-retardant application of hexagonal flaky magnesium hydroxide, and the synthesis method comprises the following steps: step 1, dissolving a mineralizer, a crystal form control agent and magnesium chloride in water in proportion; step 2, putting a certain amount of the mixed solution into a high-pressure reaction kettle for hydrothermal reaction; step 3, after the reaction is finished, taking out the cooled solution from the high-pressure reaction kettle, and filtering and separating out a white product; 4, drying the sample, and grinding to obtain pure magnesium hydroxide powder; through reasonable process design and optimization, the prepared magnesium hydroxide not only has regular morphology and better dispersity, but also has excellent performance in the field of flame retardance of high polymer materials, meets the requirement of environmental protection, has the production advantages of low cost and high efficiency, and is suitable for industrial production. The method not only can effectively improve the overall utilization rate of salt lake resources, but also has remarkable economic and application values, and has wide industrial application prospects.

The invention discloses an anti-aging water-stop belt and a preparation method and application thereof, and relates to the technical field of water-stop belts. The invention relates to an anti-aging water-stop belt which is prepared from the following raw materials in parts by mass: 40-60 parts of chloroprene rubber, 10-20 parts of natural rubber, 10-20 parts of ethylene propylene diene monomer, 15-30 parts of carbon black, 5-15 parts of white carbon black, 5-15 parts of a plasticizer, 0.5-2 parts of sulfur, 0.5-1.5 parts of an accelerant, 1-2 parts of an anti-aging ultraviolet light absorber, 5-15 parts of aluminum hydroxide, 1-3 parts of stearic acid and 3-8 parts of zinc oxide. The obtained water-stop belt has excellent ultraviolet aging resistance, ozone resistance and chemical corrosion resistance while keeping high elasticity, the mechanical stability of the water-stop belt is remarkably improved compared with that of a traditional product, the water-stop belt is suitable for joint sealing in harsh environments such as bridges, tunnels and water conservancy projects, and the waterproof service life of engineering structures can be effectively prolonged.

The invention relates to a preparation method of a high-activity transition metal phosphide catalyst, which comprises the following steps: taking basic nickel cobalt carbonate (NiCo-OH / NF) grown on foamed nickel in situ as a precursor, placing the precursor at the downstream of a tubular furnace, placing NaH2PO2 at the upstream of the tubular furnace, annealing in a nitrogen atmosphere at 350 DEG C for 2 hours, and naturally cooling to obtain NiCoP / NF; the preparation method comprises the following steps: soaking NiCoP / NF in a potassium salt solution of a boride, washing, and carrying out vacuum drying to obtain a boron-potassium modified catalyst precursor NiCoP-BK / NF; in a three-electrode system, electrodeposition is carried out in an electrolyte containing a Ni source, a Fe source and deionized water, and the high-activity transition metal phosphide-nickel iron hydroxide NiCoP-BK-coated NiFe-LDH / NF heterojunction composite catalyst is obtained. The activity and stability of the transition metal phosphide catalyst can be remarkably improved, and the preparation method is simple and low in cost.

The invention belongs to the field of coal gangue resource utilization, and particularly discloses a method for separating and recovering silicon and aluminum elements from coal gangue. The coal gangue is used as a raw material, and efficient resource utilization of the coal gangue is realized through crushing and ball milling, high-temperature roasting activation and acid-base combined treatment. The coal gangue is subjected to high-temperature fluorination roasting by adopting an activating auxiliary agent fluorinating agent to form soluble fluosilicate (H2SiF6) and a fluorine-aluminum compound (AlF3), so that the subsequent silicon-aluminum separation is obviously promoted. The method comprises the following steps: desiliconizing through alkali treatment, leaching and converting silicon in the coal gangue into sodium silicate, and carrying out solid-liquid separation to obtain sodium silicate filtrate and aluminum-rich leaching residues; and then acid treatment is conducted on the aluminum-rich leaching residues, aluminum salt or aluminum hydroxide is prepared, and finally efficient separation of silicon and aluminum is achieved. According to the method, through high-temperature activation roasting, the normal-pressure alkaline leaching desiliconization effect is improved, the acid extraction aluminum efficiency is remarkably improved, the advantages of an acid method and an alkaline method are effectively combined, and the problems that coal gangue resources are difficult to utilize and the resource recovery rate is low are solved.

The invention relates to the field of flame retardants, in particular to a wet modified magnesium hydroxide flame retardant and a preparation method thereof. The preparation method comprises the following steps: step 1, preparing aminated magnesium hydroxide particles; step 2, preparing amino sulfonamide magnesium hydroxide particles; and step 3, preparing the modified magnesium hydroxide flame retardant. Compared with a traditional magnesium hydroxide flame retardant, the use amount of the composite flame retardant in a flame-retardant material can be reduced by 10%, but even if the use amount is reduced, the composite flame retardant still can show good flame retardance, and the mechanical property and the heat and humidity resistance of a resin material can be obviously improved.

The invention relates to a NiCoW-CoP / Co3O4 (at) NF self-supporting heterostructure catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing a CoP-coated NF precursor on foamed nickel through a constant potential electrodeposition method, then carrying out annealing treatment in a muffle furnace, and finally carrying out electrodeposition on NiCoW-LDH to obtain the NiCoW-CoP / Co3O4-coated NF material. According to the preparation method, the microsphere material with the surface covered with the dendritic dendrites is synthesized, and exposure of active sites is increased through the special surface structure of the microsphere material. The compounding of the trimetal hydroxide containing high-valence tungsten and the introduction of oxygen vacancies can effectively enhance the local electron density of oxygen atoms on the surface of the catalyst, thereby enhancing the catalytic performance and seawater corrosion resistance of the material. Compared with the prior art, the method disclosed by the invention is simple to operate and low in cost, and the prepared catalyst has high electrocatalytic activity, relatively low hydrogen evolution overpotential and oxygen evolution overpotential and long-time stability. And the method has important theoretical significance and potential application value for developing a bifunctional electrocatalyst suitable for electrolyzing seawater.

The invention discloses a rare earth hybrid flame retardant as well as a preparation method and application thereof, and belongs to the technical fields of inorganic synthesis, flame retardants and high polymer materials. Rare earth hydroxide is successfully loaded on the surface of a flame retardant through an in-situ deposition method to prepare a rare earth hybrid flame retardant, and the rare earth hybrid flame retardant is further dispersed in a high polymer material matrix through melt blending to prepare the flame-retardant high polymer composite material. The hybrid flame retardant prepared by a deposition method can significantly improve the dispersion compatibility of the flame retardant in a high polymer material, and effectively alleviates the mechanical property degradation caused by the filling of the traditional flame retardant; based on the gas phase-condensation phase synergistic effect of the rare earth hydroxide and the flame retardant, the flame retardance and smoke suppression performance of the high polymer material can be synchronously improved. The rare earth hybrid flame retardant can be applied to various high polymer materials such as polyolefin cables, thermoplastic elastomers, polyurethane and the like, can synchronously improve flame retardance, smoke suppression, mechanical performance and comprehensive performance, and has a wide application prospect.

The invention relates to the technical field of composite catalyst materials, in particular to a ferrocobalt bimetal hydroxide / BCN composite material and a preparation method and application thereof.The preparation method comprises the steps that cobalt nitrate and ferric nitrate are used for preparing a metal salt solution, sodium carbonate and sodium hydroxide are used for preparing a precipitant solution, a B-doped carbon nitride BCN material is added into the metal salt solution to form a uniform suspension, and the suspension is dried to obtain the ferrocobalt bimetal hydroxide / BCN composite material; dropwise adding the precipitant solution into the suspension to obtain a precursor solution, performing hydrothermal reaction on the precursor solution, and performing centrifugal impurity removal and drying to construct a heterostructure between layered double hydroxide and BCN in situ to obtain the Co-Fe LDH-coated BCN composite material. Through boron doping and heterostructure construction, the charge separation capacity of graphite carbon nitride is enhanced, the electron migration efficiency is improved through a heterointerface structure, the metal ion release amount and the cycle stability are controlled, and the catalytic performance is remarkably improved.

The invention relates to the technical field of cables, and provides a high-strength mining cable. Comprising a wire core and a sheath layer wrapping the surface of the wire core. The sheath layer is prepared from the following raw materials in parts by weight: 75 to 85 parts of polyvinyl chloride resin, 25 to 35 parts of chloroprene rubber, 20 to 30 parts of ethylene-vinyl acetate copolymer, 26 to 28 parts of core-shell SiO2 (at) BN composite material, 14 to 16 parts of silane coupling agent modified calcium carbonate, 8 to 10 parts of carbon black, 4 to 6 parts of magnesium oxide, 10 to 15 parts of aluminum hydroxide, 5 to 7 parts of magnesium hydroxide, 0.5 to 1.5 parts of antioxidant, 0.8 to 1.2 parts of vulcanizing agent and 0.7 to 0.9 part of auxiliary vulcanizing agent. According to the high-strength mining cable prepared in the invention, the wear resistance and acid and alkali resistance of the mining cable are enhanced, and the mining cable has certain fireproof and flame-retardant properties.

The invention provides a biological magnesium alloy micro-arc oxidation coating supercritical hole sealing method based on a thermodynamic sedimentary phase diagram, which comprises the following steps: establishing deposition-dissolution balance of metal ion phosphide and hydroxide of a phosphate conversion film in a supercritical carbon dioxide environment at different pH values to obtain the thermodynamic sedimentary phase diagram; selecting a NaH2PO4 solution according to a thermodynamic sedimentary phase diagram, and adding NaHCO3 to obtain a hole sealing solution; the hole sealing solution is injected into a reaction kettle to be heated, and then a refrigerator is started to convert generated carbon dioxide gas into supercritical carbon dioxide; and the biological magnesium alloy subjected to micro-arc oxidation is placed in the hole sealing solution in the reaction kettle to be pressurized, and holes of the micro-arc oxidation coating on the surface of the biological magnesium alloy are sealed. The invention provides a supercritical hole sealing method for a biological magnesium alloy micro-arc oxidation coating based on a thermodynamic sedimentary phase diagram. And the hole sealing effect is good.

The invention provides a concrete composite expanding agent and a preparation method thereof, and belongs to the field of concrete admixtures. The concrete composite expanding agent comprises modified phosphogypsum, fly ash, bauxite, a modified oxide and an auxiliary agent, and is obtained by uniformly mixing the modified phosphogypsum, the fly ash, the bauxite, the modified oxide and the auxiliary agent which have different specific surface areas. According to the composite expanding agent, the modified ardealite and the fly ash synergistically provide an early-stage expansion source, early-stage shrinkage of concrete is compensated through calcium sulphoaluminate hydration products, meanwhile, modified magnesium oxide serves as a later-stage expansion source, magnesium hydroxide is generated through slow hydration, and long-term expansion compensation is achieved; the device has the advantages of good strength, compensation capability and the like; a large amount of industrial waste residues such as ardealite and fly ash are utilized, high-added-value utilization of the industrial waste residues is achieved, and remarkable economic benefits are achieved.

The invention provides a preparation method of a nickel-based composite oxygen evolution anode for alkalescent electrolyte. According to the invention, nickel-based alloy is used as substrates, two same substrates are respectively used as a working electrode and an auxiliary electrode, two-electrode system electrochemical oxidation reduction treatment at room temperature is carried out in a mixed solution of phosphate, carbonate and chloride, and two reconstructed nickel-based composite oxygen evolution electrodes are obtained at the same time. In the electrochemical oxidation process, nickel ions and other metal (Fe, Co, Cr and Mn) ions are dissolved out from the nickel-based alloy under the etching assistance of chloride ions; in the electrochemical reduction process, water on the electrode is reduced to form hydroxyl. Under continuous oxidation reduction, substance reconstruction is carried out to generate a composite catalyst layer of phosphate, carbonate and hydroxide of nickel and other metals, so that not only can the oxygen evolution activity be improved, but also metal dissolution and corrosion passivation when the catalyst is used in a weakly alkaline solution can be inhibited, and the durability of the electrode is greatly improved.

The invention relates to the field of electro-catalytic materials, and particularly discloses a layered transition metal hydroxide catalyst as well as a macro-quantity preparation method and application thereof. According to the method, the nanoparticles are formed through solvent difference induction, the nanoparticles are adsorbed on the foamed nickel substrate, formation of the layered transition metal hydroxide on the foamed nickel substrate is promoted, the layered transition metal hydroxide is prepared through a heterogeneous nucleation mechanism, and compared with a traditional homogeneous nucleation process, disordered aggregation of the nanoparticles can be effectively prevented; the preparation method has the advantages of high dispersity and uniform structure, the preparation method does not depend on conditions such as high temperature and high pressure, the equipment cost, energy consumption and safety risk can be reduced, and the method has universality and environmental friendliness and can be applied to macroscopic preparation of the catalyst with good uniformity.

Organometallic precursors are described for the formation of high resolution lithography patterning coatings based on metal oxide hydroxide chemistry. The precursor compositions generally comprise ligands readily hydrolysable by water vapor or other OH source composition under modest conditions. The organometallic precursors generally comprise a radiation sensitive organo ligand to tin that can result in a coating that can be effective for high resolution patterning at relatively low radiation doses and is particularly useful for EUV patterning. The precursors compositions are readily processable under commercially suitable conditions. Solution phase processing with in situ hydrolysis or vapor based deposition can be used to form the coatings.

The invention belongs to the technical field of catalysts, and particularly relates to a general preparation method and application of amino acid intercalated layered hydroxide. According to the catalyst material, the nickel-iron layered hydroxide is optimized through amino acid intercalation, aromatic amino acid is anchored between layers of the nickel-iron layered hydroxide through a one-step hydrothermal method, dissolution of metal ions is inhibited, the catalyst structure is stabilized, an interlayer electronic structure is regulated and controlled, and reaction kinetics is accelerated. According to the invention, the improvement method of the organic-inorganic hybrid catalyst is perfected, and a new thought is provided for the development of the nickel-iron layered hydroxide catalyst.

The invention discloses a lanthanum-doped CuMgAl catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method of the lanthanum-doped CuMgAl catalyst comprises the following steps: adding a copper salt, a magnesium salt, an aluminum salt and a lanthanum salt into water to obtain a first solution; adding a precipitator into water to obtain a second solution; adding the second solution into the first solution to adjust the pH value to 10.5 to obtain a mixed solution, stirring the mixed solution to generate a co-precipitation reaction, after the reaction is completed, carrying out aging treatment to promote growth and structure ordering of layered double hydroxide crystals, and then carrying out calcination treatment to convert a layered double hydroxide precursor into an oxide, thereby obtaining the layered double hydroxide. And the lanthanum-doped CuMgAl catalyst is obtained. The lanthanum-doped CuMgAl catalyst prepared by the preparation method disclosed by the invention has excellent activity and stability.

The invention discloses a water quality total hardness and calcium and magnesium ion content detection method, which comprises: extracting a water quality sample to be detected, and injecting into a cuvette; taking a color developing reagent, injecting the color developing reagent into the cuvette, blowing, stirring and uniformly mixing to obtain a reaction solution; measuring the initial current i0 of the reaction liquid in the cuvette at the wavelength of 475nm and the initial current I0 of the reaction liquid in the cuvette at the wavelength of 640nm; then titrating, and recording a measured current value and a titration volume while titrating; according to the obtained relation curve of the current and the titration volume under the two wavelengths, obtaining the titration volume corresponding to a titration judgment end point, and substituting the titration volume into the calibration curve to obtain the concentration of total hardness or the content of calcium and magnesium ions in the water sample. The measuring method disclosed by the invention not only has extremely high accuracy and precision, but also can be applied to measurement of total hardness or calcium ions under different indicators at the same time, and the turbidity of a water sample or magnesium hydroxide precipitate generated during calcium ion measurement hardly affects a test result.

The invention relates to the technical field of sewage treatment, in particular to a wastewater recycling method which comprises the following steps: cyanide breaking: in an alkaline environment, adding an oxidizing agent to oxidize wastewater; first monitoring: monitoring the oxidation reduction potential and the free cyanide concentration in real time, and adjusting the adding proportion of sodium hypochlorite based on the ORP dynamic range and the cyanide concentration attenuation rate; precipitation: adding hydroxide, and carrying out heavy metal precipitation; second monitoring: acquiring component information in the sewage, and adding sodium hydroxide and sodium sulfide in a gradient compensation manner after triggering judgment; membrane treatment: performing filtration and degradation treatment through a biological membrane; 3, monitoring: dynamically adjusting the aeration intensity and the backwashing period according to the coupling relationship between the pressure difference slope and the sludge concentration; and 4, monitoring: calculating a process capability index, judging whether the process capability index is smaller than a third threshold value, and if so, adjusting the sodium sulfide dosage in the precipitation stage. The method has the effect of reducing resource waste in the wastewater treatment process.

The invention discloses a perfluorohexanone fire extinguishing agent and a preparation method and application thereof.The perfluorohexanone fire extinguishing agent is prepared from, by mass, 60-70 parts of perfluorohexanone microcapsules, 10-20 parts of aluminum hydroxide, 6-10 parts of graphite, 5-10 parts of titanium dioxide, 4-8 parts of ultraviolet absorbent, 2-6 parts of ammonium polyphosphate, 3-6 parts of calcium oxide, 1-3 parts of fumed silica, 1-3 parts of nano-silica and 1-3 parts of trimethyl phosphate. According to the formula and process of the fire extinguishing agent, through triple technical innovation of shell layer modification, nano compounding and supercritical deposition, the breakthrough of efficient explosion suppression, long-acting anti-after-combustion, low toxicity and environment friendliness of the fire extinguishing agent is achieved, and the industrial popularization potential is achieved.

The invention relates to the technical field of vaccine adjuvants, and particularly discloses a preparation method of a nanoscale aluminum hydroxide adjuvant based on organic metal alkoxide hydrolysis. Aluminum isopropoxide is used as a precursor, and a hydrolysis interface is directionally regulated and controlled through a compound surfactant; a staged hydrolysis process is adopted, and a kinetic equation is met; and the surface is modified by a KH-550 coupling agent. According to the preparation method disclosed by the invention, boehmite phase crystallization, nanoscale uniformity and high antigen adsorption stability are synchronously realized at low temperature through alcoholate hydrolysis bond energy reconstruction, surface activity compounding interface regulation and control and staged kinetic control, and the bottlenecks of high temperature, high energy consumption and non-uniform particle size of a traditional process are overturned; and a novel industrial scheme with low consumption and high efficiency is provided for vaccine adjuvants.

The invention relates to a method for preparing hexagonal flaky magnesium hydroxide through a hydration modification one-step method, and belongs to the technical field of inorganic material preparation. Hyperbranched sodium polyacrylate containing phosphonic acid and ammonium phosphonate salt is synthesized and serves as a crystal forming agent for magnesium hydroxide crystal growth, the hyperbranched sodium polyacrylate can coordinate with magnesium ions, uniform growth of all crystal faces of the magnesium hydroxide crystal is promoted, and the magnesium hydroxide crystal growth rate is increased. And the hyperbranched structure can better and moderately wrap the formed magnesium hydroxide crystal, so that the uniform growth property of the crystal face is improved. In addition, ammonium phosphate groups and carboxylate in the crystal forming agent have good wetting dispersity, agglomeration of magnesium hydroxide crystals is weakened, and the particle size distribution uniformity is improved. According to the method, the magnesium oxide powder and the crystal forming agent are ground and then subjected to the hydration reaction, the hexagonal flaky magnesium hydroxide is synthesized through a one-step method, and the prepared magnesium hydroxide is in a regular hexagonal flaky shape, has uniform particle size distribution, and has relatively high purity and relatively low impurity content.

The present invention provides a manganese metal-organic framework material with oxidase properties, a preparation method, and an application thereof. The material is prepared by the following method: using 1,3,5-trimethic acid as an organic ligand, manganese acetate tetrahydrate as a manganese source, and a water-ethanol solution as a solvent, to obtain a manganese metal organic framework (MOF) precursor via a solvothermal synthesis technique; the manganese MOF precursor is post-synthetically modified using an oxidant, wherein the oxidant is a mixed solution of an aqueous alkali metal hydroxide solution and H2O2, and the ratio of the manganese MOF precursor to the alkali metal hydroxide is (400-600) mg:(0.5-2) mmol. By using specific types and amounts of manganese MOF precursors and oxidants, the resulting metal-organic framework nanomaterial has specific enzyme-like properties, can exert the function of uricase, and has optimal and high uricase activity under neutral pH conditions.

The invention belongs to the field of corrosion and protection, and discloses a preparation method of an intelligent coating with multistage self-repairing capability. According to the method, a core-shell structure nano container with a metal organic framework (MOF) compound as a core and layered double hydroxide (LDH) as a shell is prepared, different functional objects are respectively loaded in the core and the shell by adopting a step-by-step in-situ loading method, and graded release of the functional objects is realized by utilizing pH responsiveness of the MOF and corrosive ion responsiveness of the LDH; the nano container is added into an organic coating as a filler to construct an intelligent coating with multi-stage self-repairing capability. The problems of passive protection and uncontrollable corrosion inhibitor release of a traditional anti-corrosion coating are solved, the coating can repair corrosion defects in time according to needs, the long-acting corrosion resistance is remarkably improved, the preparation process is simple, the condition is mild, and the coating is suitable for metal protection of high-end equipment and other complex service environments.

The invention discloses a preparation and application method of active magnesium oxide for cobalt precipitation, which comprises the following steps: adding acetate during preparation of an active magnesium oxide precursor magnesium hydroxide to obtain magnesium hydroxide with a double-tooth structure; when magnesium oxide is prepared through calcination, conversion from magnesium hydroxide to magnesium oxide can be achieved at a low temperature, and meanwhile high activity is obtained; and finally, the magnesium oxide slurry is added into the cobalt precipitation pre-solution for cobalt precipitation, the cobalt precipitation effect is good, and the obtained coarse cobalt hydroxide cobalt is high in grade. The magnesium hydroxide regulating agent is used for promoting generation of magnesium oxide rich in active sites, the magnesium hydroxide regulating agent is applied to the wet metallurgy cobalt deposition process, the cobalt deposition effect of active magnesium oxide prepared through a chemical method is effectively improved, other methods except for the method for reducing the particle size and promoting the activity of magnesium oxide are developed, acetate is selected as the magnesium hydroxide regulating agent, the dosage is small, and the cost is low. Magnesium oxide obtained through calcination is high in purity, the cobalt deposition process is not affected, unit consumption of magnesium oxide can be reduced, and cost is saved.

The present invention relates to an activator for cementless binders comprising: a silicate of an alkali metal or alkaline earth metal or a hydrate thereof; a carbonate of an alkali metal or alkaline earth metal or a hydrate thereof; and a hydroxide of an alkali metal or alkaline earth metal or a hydrate thereof. The invention also relates to a cementless binder comprising said activator and to a cementless cementitious material comprising said cementless binder. Compared with the traditional ordinary Portland cement, the building material containing the cement-based cementing material has better compressive strength and has the characteristic of environmental protection.

The invention belongs to the technical field of inorganic powder material modification, and discloses an aluminum hydroxide powder modification treatment method which comprises the following steps: step 1, plasma pretreatment, step 2, in-situ coordination reaction, step 3, nano-composite coating and step 4, post-treatment. The performance of aluminum hydroxide is remarkably improved through a plasma pretreatment-in-situ coordination-nano coating synergistic process, specifically, surface hydroxyl groups are reduced by 45% through plasma treatment, and a contact angle is larger than or equal to 120 degrees, the thermal decomposition temperature is increased by 55 DEG C, and LOI is increased to 31.8% by combining Al-O-P bonding and a SiO-GQDs composite coating layer. According to the process, the energy consumption of the pulse plasma is reduced by 40%, the cost of the spray drying coating process is reduced by 60%, and the GQDs are derived from the graphite waste, so that resource circulation is realized; and the material is non-toxic, has no stripping on a cold-hot cycle interface, meets the green flame-retardant standard, and provides an efficient solution for sustainable development of inorganic fillers.

The invention discloses a gradient chelation-free radical activation synergistic eucalyptus chemithermomechanical pulp wastewater composite coagulant and a preparation method thereof, and belongs to the technical field of eucalyptus chemithermomechanical pulp wastewater treatment. Ferrous sulfate heptahydrate, aluminum hydroxide and magnesium sulfate are used as raw materials, and the water purifying agent with the viscosity of 35-45 mPa.s is prepared through gradient chelation reaction, free radical activating treatment, functional component composite reaction, pH and specific gravity regulation and control and curing treatment. By utilizing the synergistic effect of the polydimethyldiallylammonium chloride and the formaldehyde dicyandiamide resin, the electric neutralization capability on macromolecular colloidal substances in the wastewater is remarkably enhanced, and macromolecular substances which are difficult to biodegrade in the water are effectively removed; when the compound coagulant is used for treating the eucalyptus chemithermomechanical pulp wastewater, the addition amount of the compound coagulant is small, and the compound coagulant has excellent COD (Chemical Oxygen Demand) reduction and decolorization effects.