23 results about "Mn oxide" patented technology

The invention discloses preparation and application of a manganese hydroxylate modified zirconium-based metal organic framework, and belongs to the technical field of wastewater treatment. According to the preparation method, firstly, Mn oxide serves as a dopant, naphthalic acid serves as a frame connector, a zirconium-manganese bimetal organic frame is prepared through a hydrothermal method, and hydroxylation treatment is conducted through an alkali solution; mn replaces Zr atoms on a zirconium cluster to form high charge density with Zr, Mn and Zr can jointly participate in an electron transfer process and an active oxygen generation process to form double active centers, and the catalytic activity of a Fenton-like system is enhanced, so that the oxidative adsorption removal rate of As is remarkably improved. Experimental results show that the As removal rate can still reach 95.1% after five cycles, the targets of oxidative adsorption of As and reutilization are achieved, and the application of the zirconium-based metal organic framework in the field of catalytic adsorption of As is expanded.

The invention discloses a purple phosphorus-manganese dioxide nano-composite enzyme as well as a preparation method and application thereof, and belongs to the technical field of biological medicines. The purple phosphorus-manganese dioxide nano-composite enzyme is formed by compounding a purple phosphorus nanosheet and nano-manganese dioxide through in-situ mineralization, and the surface of the purple phosphorus-manganese dioxide nano-composite enzyme is modified with methoxy polyethylene glycol amine. The preparation method comprises the following steps: preparing a purple phosphorus nanosheet material through ultrasonic liquid phase stripping; and at room temperature, dropwise adding a potassium permanganate aqueous solution into the purple phosphorus nanosheet material aqueous solution, then adding a methoxy polyethylene glycol amine aqueous solution, stirring overnight, and centrifugally collecting precipitate to obtain the purple phosphorus-manganese dioxide nano compound enzyme. The purple phosphorus-manganese dioxide nano-composite enzyme provided by the invention is composed of a manganese dioxide nano-material with self-enhanced chemical kinetic catalytic performance and a purple phosphorus nanosheet with near-infrared photothermal conversion performance, and the effect of killing tumor cells under NIR-II synergistic chemical kinetic catalysis can be realized.

This flux-cored wire for welding includes a steel sheath and a flux filled inside the steel sheath and contains an oxide and an alloy component. The total amount X of Mn oxides in terms of MnO is 0.3-15.0% in mass% with respect to the total mass of the flux-cored wire. The total amount Y of Ti oxides in terms of TiO2 is 0.1-10.0%. The ratio of the total amount X of Mn oxides to the total amount of the total amount X of Mn oxides and the total amount Y of Ti oxides (X / (X+Y)) is 0.65-1.00. The total content of Mn excluding Mn contained as an oxide is 3.0-30.0%.

This invention provides an alloyed hot-dip galvanized steel sheet with a tensile strength of 590 MPa or higher, excellent ductility and microcrack resistance, comprising a steel plate and an alloyed hot-dip galvanized layer. The steel sheet has a carbon equivalent (Ceq) of 0.370 or higher and less than 0.520, and a total Nb and Ti content of 0.010 to 0.080% by mass. At one-quarter of the plate thickness, the martensite area fraction is 5 to 30%. From the surface of the steel sheet to a depth of 20 μm, the martensite area fraction is 5 to 30%, the original austenite grain size is 3.0 μm or less (martensite area fraction 50% or higher), and the total Nb and Ti content in precipitates smaller than 100 nm is 50 ppm by mass or more, while the total Nb and Ti content in precipitates larger than 100 nm is 350 ppm by mass or less. Within a range from the surface of the steel plate to a depth of 1 μm, the long sides of the Si and Mn oxides present at the grain boundaries are less than 200 nm.

The present invention relates to the field of genetic engineering, and in particular to the application of overexpressing the perR gene in improving the biological manganese oxidation of Bacillus thuringiensis. The present invention uses the strain Bt 97-27 as the starting strain, which is capable of oxidizing Mn (II), forming spores and producing biofilms to resist adverse external environmental factors. The present invention successfully constructs a new genetically engineered strain OEperR by overexpressing the perR gene in the Bt 97-27 strain. Compared with the starting strain, the OEperR strain achieves significant improvements in manganese oxidation, manganese removal and biofilm formation. It not only shortens the culture and acclimation cycle of the strain, but also greatly enhances the environmental adaptability and tolerance of the strain, opens up a new way for the application of microbial technology in the field of manganese-contaminated environmental remediation, and provides an important basis for in-depth exploration of how microorganisms respond to manganese and regulate its oxidation process.

The invention discloses a preparation method of a fluoride-free exothermic insulated riser, and relates to the technical field of casting. The method comprises the following steps: modifying micron-nano compound aluminum powder through a silane coupling agent, carrying out in-situ reduction on loaded zero-valent iron-cerium dioxide catalytic sites, sequentially coating phenolic resin and a potassium nitrate-manganese dioxide composite oxygen source, and finally carrying out interfacial hydrolytic polycondensation to form a silicon dioxide shell, thereby obtaining the core-shell structure composite heat generating agent. In addition, after hollow aluminum silicate microspheres are subjected to etching and pore forming, vacuum impregnation and filling of organic-inorganic composite aerogel are conducted, hydrophobic modification and coating of nanometer aluminum oxide sol are conducted, and the composite heat preservation material is prepared; uniformly mixing the heat generating agent with the thermal insulation material, the mullite powder, the corundum powder, the expandable graphite, the waste glass powder and the binder, vibrating and compacting, and standing and curing to obtain a finished product. By constructing a multi-level core-shell heating structure and a porous multi-level heat insulation structure, the problems that a fluoride-free riser is difficult to heat and poor in heat preservation are solved.

The invention belongs to the technical field of air purification materials, and discloses an antibacterial formaldehyde removal catalyst as well as a preparation method and application thereof. The antibacterial formaldehyde removal catalyst comprises a perylene quaternary ammonium salt-graphene composite antibacterial agent, a catalytic active component, an inorganic biochar binder and a pore forming agent, manganese dioxide granulation is achieved by constructing a porous framework, the activity of manganese dioxide is reserved, graphene inhibits agglomeration through a flexible sheet layer and establishes a conductive path, and the common core lies in that through structure fixation instead of dense wrapping, the smoothness of a reactant diffusion channel is maintained to the maximum extent while the particles are endowed with mechanical strength, and the mechanical performance of the particles is improved. Shielding and sintering of active sites in the granulation process are avoided, so that the catalytic activity of manganese dioxide is efficiently reserved; the catalyst has a dual-function integrated effect, and also has efficient room-temperature catalytic formaldehyde removal capability and broad-spectrum antibacterial capability, so that the structure of an air purification system is simplified.

The invention relates to the technical field of manganese oxide catalysts, in particular to a SiO2-loaded rare earth-doped Mn oxide catalyst as well as preparation and application thereof. The SiO2 loaded rare earth doped Mn oxide catalyst provided by the invention has a large number of surface oxygen holes, and can convert herbal lignin into high value-added aromatic aldehydes such as p-hydroxybenzaldehyde, vanillin and the like at high selectivity and high conversion rate under mild conditions; rare earth elements and Mn in the crystal structure of the catalyst interact to improve the activity of the catalyst, and furthermore, insufficient exposure of an active center caused by agglomeration of the catalyst is avoided through loading of SiO2, so that the reaction selectivity is effectively ensured, and the reaction efficiency is improved.

Provided are: a steel sheet which contains Ni, Cu and Sn, and which has excellent chemical conversion treatability even if a certain period of time has elapsed after degreasing; this steel sheet and a member containing the same are characterized in that the chemical composition of the steel sheet contains, in mass%, 1.20-3.00% of Mn, 0.010-1.000% of Ni, 0.010-1.000% of Cu, 0.003-1.000% of Sn, and 0.01-less than 0.75% of Si, and in that Mn / (Si + Mn) > 0.80 is satisfied, and in that the number N30 per 10 [mu] m of Mn oxides having an equivalent circle diameter of 30 nm or more exposed on the surface of the steel sheet satisfies N30 > = 20.

The present invention provides: a steel sheet that contains Ni, Cu, and Sn and has excellent chemical conversion treatability even after a set amount of time has passed after degreasing; and a component that includes the steel sheet.　The steel sheet and the component that includes the steel sheet are characterized in that the chemical composition of the steel sheet is 1.20–3.00 mass% Mn, 0.010–1.000 mass% Ni, 0.010–1.000 mass% Cu, 0.003–1.000 mass% Sn, and at least 0.01 but less than 0.75 mass% Si and satisfies Mn / (Si+Mn)>0.80 and in that the number N30 per 10 μm of Mn oxides that are exposed at the surface of the steel sheet and have a size of at least 30 nm by circle equivalent diameter satisfies N30≥20.

The invention provides an ecological restoration material for mine water treatment and a preparation method of the ecological restoration material, and belongs to the field of water pollution governing.The preparation method comprises the steps that a porous mineral base material and an alkaline slow-release component are evenly mixed and subjected to calcination treatment, and a composite base material is obtained; dipping the composite base material in a mixed solution of Fe (NO3) 3 and MnSO4 for a preset time, drying the composite base material, and carrying out ball-milling compounding on the composite base material and biological activated carbon to obtain an Fe-Mn oxide loaded activated carbon complex; mixing the activated carbon complex with an ecological restoration additive and diatomite, and performing extrusion granulation to obtain ecological composite particles; the ecological composite particles are soaked in a PLA solution for preset time, and the ecological restoration material for mine water body treatment is obtained after drying. Through cooperation of multiple components and improvement of a preparation process, multiple remediation mechanisms are integrated, heavy metal can be effectively adsorbed and converted, pH can be effectively adjusted, efficient, stable and lasting treatment on mine water pollution is achieved, and the method is an efficient and environment-friendly scheme for mine water treatment.

The present invention relates to a dental zirconia mill blank comprising a porous zirconia material, the porous zirconia material comprising Zr oxide, Y oxide, optionally Al oxide, Bi oxide, Tb oxide, Er oxide, Cr oxide, the porous zirconia material not comprising Fe oxide calculated as Fe2O3 of more than 0.01 wt. %, Mn oxide calculated as MnO2 of more than 0.005 wt. %, Co oxide calculated as Co2O3 of more than 0.005 wt. %, wt. % with respect to the weight of the porous zirconia material. The invention also relates to a process of producing such a dental zirconia mill blank and a dental restoration which can be machined from the dental zirconia mill blank. Further, the invention relates to a kit of parts comprising such a dental zirconia mill blank and a dental cement.

The invention discloses microenvironment response type injectable hydrogel as well as a preparation method and application thereof. The hydrogel is of a dual-network structure formed by crosslinking phenylboronic acid modified oxidized hyaluronic acid and dopamine grafted gelatin through a dynamic Schiff base bond and a boric acid ester bond; wherein black phosphorus nanosheets and puerarin-loaded honeycomb-shaped manganese dioxide nanoparticles coated with polydopamine are dispersed in the nano-particles. The hydrogel can intelligently respond to acidic pH and a high-active oxygen microenvironment, and controllable degradation and on-demand release of contents are realized. Honeycomb-shaped manganese dioxide nanoparticles can catalyze decomposition of hydrogen peroxide to generate oxygen under an acidic condition, and meanwhile, active oxygen is removed; the black phosphorus nanosheets endow the hydrogel with excellent conductivity. The multi-layer function integrated design synchronously solves the problems of function maintenance and electrical conduction performance of the material in an anoxic environment, the adaptability and functionality of the material in a complex physiological environment are remarkably enhanced, and a new strategy is provided for development of multifunctional intelligent materials in biomedical engineering.

The present invention provides a steel sheet containing Ni, Cu, and Sn, which has excellent chemical conversion treatability even after a certain period of time has passed since degreasing, and a part including the steel sheet. The steel sheet and parts including the same of the present invention have a chemical composition of the steel sheet containing, in mass%, Mn: 1.20 to 3.00%, Ni: 0.010 to 1.000%, Cu: 0.010 to 1.000%, Sn: 0.003 to 1.000%, and Si: 0.01 to less than 0.75%, and satisfy Mn / (Si+Mn)>0.80, and the number N of Mn oxides per 10 μm exposed on the surface of the steel sheet and having an equivalent circle diameter of 30 nm or more is 30 nm. 30 But, N 30 ≧20.

A welding flux comprising, as alloy components, C: 0.050% to 5.000%, Cr: 0-20.0%, and at least one oxide selected from the group consisting of a Ba oxide, a Ca oxide, an Mn oxide, an Mg oxide, an Fe oxide, and a Zr oxide, wherein: the basicity BL of BL = 1.3 [BaO] + 0.5 [CaO + MnO + Na2O + K2O] + 0.2 [MgO + FeO] + 0.05 [ZrO2) - 0.05 [Al2O3] - 0.2 [TiO2] - 0.5 [SiO2] +5 ([C] + [Mg] + [Fe]) is 2.0-60.0; and the particle size distributions are such that more than 2.00 mm: 40% or less, more than 1.00 mm and 2.00 mm or less: 5-50%, more than 0.50 mm and 1.00 mm or less: 5-75%, more than 0.25 mm and 0.50 mm or less: 5-50%, and 0.25 mm or less: 40% or less.

Provided is an alloyed hot-dip galvanized steel sheet which has a tensile strength of 980 MPa or more and excellent ductility and microcrack resistance, and which is provided with a steel sheet and an alloyed hot-dip galvanized layer. The component composition of the steel sheet has a carbon equivalent Ceq of 0.520 or more but less than 0.700, and the total content of Nb and Ti is 0.010-0.080 mass%. The martensite area ratio at the 1 / 4 plate thickness position of the steel plate is more than 30% and 70% or less. In a range from the surface of the steel sheet to a depth of 20 [mu] m, the area ratio of martensite is more than 30% and 70% or less, the grain size of prior austenite having a martensite area ratio of 50% or more is 3.0 [mu] m or less, the total content of Nb and Ti in precipitates having a particle size of 100 nm or less is 50 ppm by mass or more, and the total content of Nb and Ti in precipitates having a particle size of more than 100 nm is 350 ppm by mass or less. In a range from the surface of the steel sheet to a depth of 1 [mu] m, the long sides of the Si and Mn oxides present on the grain boundaries are 200 nm or less.

The application discloses a gel type composite nanometer material for removing perfluorinated and polyfluorinated alkyl substances and an application method thereof, and the gel type composite nanometer material is composed of gel type strong alkaline anion resin with a functional group of quaternary ammonium and zirconium / iron / manganese nanometer material. 3 The gel type composite nanometer material has a pore volume of 0.001-0.01 cm / g and an absolute swelling rate of 1.05-1.25, and therefore can have a good adsorption effect under different pH and coexisting ion conditions; and the gel type composite nanometer material can be recycled through desorption regeneration, and the regeneration bed volume change rate and the desorption swelling rate are stable, the desorption time is 6-8 hours, the gel type composite nanometer material volume change rate is 0.9-1.1, and the desorption swelling rate is 0.9-1.05.

A MnZn-based ferrite that can suppress both reduction of the loss at a high frequency and a change in magnetic properties in a high magnetic field and a method for producing the same are provided. A MnZn-based ferrite including Fe2O3, ZnO, and MnO as main components, in which Fe2O3 is 53.2 to 56.0 mol % and ZnO is 3.0 to 12.0 mol %, with a balance of MnO, in 100 mol % of the main components, the MnZn-based ferrite includes 0.005 to 0.060% by mass of SiO2, 0.010 to 0.060% by mass of CaO, 0.10 to 0.40% by mass of CO2O3, and 0.05 to 0.30% by mass of TiO2, as auxiliary components, per 100% by mass of the main components, an average crystal grain diameter is 4 μm or less, and a sintering density is 4.8 g / cm3 or more.

The invention relates to the technical field of metal ceramic coatings, in particular to a CoNiCrAlY-ZrB2 composite coating with excellent Fe / Mn oxide accumulation resistance as well as a preparation method and application of the CoNiCrAlY-ZrB2 composite coating. The preparation method comprises the following steps: preparing CoNiCrAlY-ZrB2 composite powder which is uniform in ZrB2 ceramic distribution and suitable for thermal spraying by using step-by-step mechanical alloying; then, a CoNiCrAlY-ZrB2 composite coating is prepared on the surface of the heat-resistant steel through a high velocity oxy-fuel spraying technology; and step-by-step mechanical alloying is adopted, so that the uniformity of the hard ZrB2 ceramic in the composite powder is improved, and the mechanical property of the hard ZrB2 ceramic is far higher than that of CoNiCrAlY and CoNiCrAlY-Al2O3 coatings. Meanwhile, due to reaction inertia between ZrB2 ceramic and Fe oxide and Mn oxide and a mixed ceramic protective layer formed at the top of the coating, the CoNiCrAlY-ZrB2 composite coating has excellent Fe oxide accumulation resistance and Mn oxide accumulation resistance.

The invention discloses a method for enriching and separating nickel, cobalt and scandium, and belongs to the technical field of metal production or refining. The method comprises the following steps: adding water into cobalt nickel hydroxide for slurrying; sulfur dioxide and oxygen or air are introduced into the slurrying liquid for oxidation, a catalyst is added, and ultrasonic waves are utilized for enhanced oxidation; dilute sulfuric acid is added into the oxidized slurrying liquid for leaching, and first leaching liquid and manganese oxide residues are obtained through separation; carrying out vanadium precipitation and iron removal on the first leaching solution, and carrying out solid-liquid separation to obtain scandium-rich jarosite slag and a second leaching solution; an organic phosphoric acid extraction agent and a hydroxime extraction agent are adopted to form a synergistic extraction system and saponified, a saponified organic phase is adopted to carry out nickel and cobalt dynamic extraction separation on the second leachate, cobalt is preferentially extracted, a cobalt-loaded organic phase is obtained, and a cobalt product is obtained through separation and purification; and carrying out nickel extraction on the cobalt extraction raffinate to obtain a nickel-loaded organic phase, and separating and purifying to obtain a nickel product. According to the method, nickel and cobalt are efficiently extracted and separated, and scandium enrichment is achieved.

The invention discloses an iron-based synthetic humic acid heavy metal composite passivator as well as a preparation method and application thereof. The preparation method of the iron-based synthetic humic acid heavy metal composite passivator comprises the following steps that S1, catechol and glycine are added into an aqueous solution, manganese dioxide is added after the catechol and the glycine are dissolved, and a first mixed solution is obtained; s2, stirring the first mixed solution for reaction, and separating after stirring to obtain synthetic humic acid; s3, mixing the aqueous solution containing the synthetic humic acid with an aqueous solution of ferric salt, and adjusting the pH value to obtain a second mixed solution; and S4, the second mixed solution is stirred for a reaction, separation is conducted after stirring is completed, and the iron-based synthetic humic acid heavy metal composite passivator is obtained. In the iron-based synthetic humic acid heavy metal composite passivator, by introducing the synthetic humic acid, on one hand, the stability of an iron base can be improved, and the iron base is not prone to deterioration; on the other hand, more active functional groups can be introduced, the heavy metal binding capacity is enhanced, and the synergistic remediation effect is generated.

To provide a bond flux for submerged arc welding that offers good weldability, low diffusible hydrogen content in the weld metal, no welding defects, and yields weld metal with the required strength and stable low-temperature toughness. [Solution] In a bond flux for submerged arc welding, the following components are present in mass % of the total mass of the bond flux: SiO2: 5-20%, CaO: 5-20%, MgO: 25-35%, Al2O3: 10-20%, CaF2: 23-35%, total CO2 equivalent values ​​of one or two types of CaCO3 and MgCO3: 2-7%, total Na2O and two types of K2O: 1-5%, Si: 0.3-2.0%, Mn: 0.1-0.8%, Ni: 0.1-1.5%, Mo: 0.05-0.3%, Al: 0-0.8%, total Mn oxide equivalent value: 0-0.5%, total Fe oxide equivalent value: 0-0.2%, and total Ti oxide equivalent value: 0-0.1%.

The invention provides a method for nitriding and inducing a Fe-Zn-Mn metal oxide catalyst to form single epsilon-iron carbide in a CO2 hydrogenation reaction, which is characterized in that a Fe-Zn-Mn metal oxide is used as a precursor, and the Fe-Zn-Mn oxide is successfully nitrided by adopting a hydrogen pre-reduction and ammonia nitridation method. The successfully nitrided catalyst is applied to a CO2 hydrogenation reaction, after a long time of reaction, the phase of the catalyst tends to be stable after reduction, carburization and a series of complex reactions in the reaction process, and under the combined action of addition of Zn and Mn assistants and nitridation, the successfully nitrided Fe-Zn-Mn catalyst is induced to form iron carbide only containing epsilon-Fe2C in the reaction. The catalyst disclosed by the invention is applied to CO2 hydrogenation reaction, has relatively high catalytic activity, and shows relatively high olefin selectivity and high stability.