4019 results about "Magnesium" patented technology

The invention provides an acetylacetone-based composite thermal stabilizer which is a mixture obtained by mixing zinc acetylacetonate, calcium acetylacetonate or magnesium acetylacetonate and hydrotalcite pro rata. The composite thermal stabilizer is suitable for chloride-containing high polymer, such as polyvinyl chloride, chlorinated polyethylene, chlorinated polyvinyl chloride, copolymer of vinyl chloride-ethylene or copolymer of vinyl chloride-vinyl acetate, has better thermal stability, prolongs the thermal aging time of the chloride-containing high polymer, and overcomes the shortcomings of poor long-term performance of single stabilizer of zinc acetylacetonate, poor transparency of stabilizer of calcium acetylacetonate, and poor initial colorability of stabilizer of hydrotalcite. The composite thermal stabilizer has low cost, good initial colorability, excellent long-term performance and good transparency, and is an efficient composite thermal stabilizer.

The invention relates to a zirconia-based all-ceramic false tooth and a preparation method thereof. A core layer of the zirconia-based all-ceramic false tooth is prepared from the following components in parts by mass: 90 to 94 parts of ZrO2, 5 to 9 parts of Y2O3, 0.1 to 0.5 part of Al2O3, 0.01 to 0.5 part of Fe2O3, 0.01 to 0.5 part of Er2O3 and 0 to 0.2 part of MnO2, and a shell layer of the zirconia-based all-ceramic false tooth is prepared from the following components in parts by mass: 24.5 to 49.5 parts of CaCO3, 45 to 50 parts of SiO2, 0 to 25 parts of MgO, 0.01 to 0.5 part of Fe2O3, 0.01 to 0.5 part of Er2O3 and 0 to 0.2 part of MnO2. The preparation process comprises the following steps: performing dry pressing and isostatic pressing on raw materials of the core layer, presintering, and carving to obtain a zirconia-based false tooth biscuit; meanwhile, calcining raw materials of a shell layer, then adding deionized water, a dispersing agent and an adhesive, and carrying out ball milling and mixing to obtain calcium-magnesium-silicon-based ceramic slurry; and coating the calcium-magnesium-silicon-based ceramic slurry on the surface of the zirconium oxide-based false tooth biscuit, and sintering to obtain the zirconium oxide-based all-ceramic false tooth provided by the invention. The zirconia-based all-ceramic false tooth has good jade texture and is closer to the natural color of natural teeth.

The invention discloses a fluoride salt-free nitrate-free cast iron enamel semitransparent glaze as well as a preparation method and application thereof, and belongs to the technical field of enamel. The semitransparent glaze is prepared from quartz, anhydrous borax, sodium carbonate, potassium carbonate, calcium carbonate, potassium feldspar, zinc oxide, lithium carbonate, zirconium silicate, titanium dioxide, aluminum oxide, trisodium phosphate, antimony oxide, magnesium carbonate and barium carbonate according to a specific mass ratio. The preparation method comprises the steps of raw material mixing, high-temperature melting under a pure oxygen condition, wiredrawing detection, quenching and the like. The semitransparent glaze is completely free of fluoride salt and nitrate, the problems of fluoride emission and environmental protection equipment blockage are avoided from the source, the fluorine content of the product is not detected through detection, the product meets the requirements of European Union REACH regulations, meanwhile, the product has good porcelain surface, luster and low-temperature firing adaptability, and is suitable for cast iron matrixes, the firing temperature is 740-760 DEG C, and the firing time is 2-3 hours. The method can be used for producing green and environment-friendly enamel products.

The invention discloses an intelligent early-warning cable system, and the system comprises a magnesium oxide mineral insulated fireproof cable which is composed of a conductor, two hollow seamless round copper pipes, two transmission optical fiber units, a magnesium oxide powder insulating layer, and a sheath. The DAS is connected to the single-mode transmission optical fiber unit to detect vibration information of the magnesium oxide mineral insulated fireproof cable; the DTS distributed temperature sensor is connected to the multimode transmission optical fiber unit to detect the temperature information of the magnesium oxide mineral insulated fireproof cable; the data analysis module is connected to the DAS distributed sonic sensor and the DTS distributed temperature sensor, and determines a risk according to the vibration information detected by the DAS distributed sonic sensor and the temperature information detected by the DTS distributed temperature sensor; and the data early warning module is connected to the data analysis module and executes corresponding early warning measures according to the risk condition determined by the data analysis module. According to the intelligent early warning cable system, the intelligent early warning function of the rigid fireproof cable can be realized.

The invention discloses an ultrahigh-strength collision energy absorption aluminum-magnesium-silicon-copper alloy profile and a preparation method thereof. The ultrahigh-strength collision energy absorption aluminum-magnesium-silicon-copper alloy profile is prepared from, by mass, 1.2%-1.4% of Si, smaller than or equal to 0.2% of Fe, 0.50%-0.80% of Cu, 0.50%-0.8% of Mn, 1.0%-1.3% of Mg, 0.15%-0.20% of Cr, smaller than or equal to 0.20% of Zn, 0.01%-0.05% of Ti, smaller than or equal to 0.20% of V, 0.10%-0.20% of Zr, smaller than or equal to 0.05% of other single impurities, smaller than or equal to 0.10% of total impurities and the balance Al. Through strict limitation of chemical components, impurity and gas contents and homogenization, extrusion and heat treatment systems, the aluminum alloy has excellent transverse and longitudinal collision energy absorption performance under the condition of sufficient strengthening, the yield strength of the aluminum alloy is larger than 360 MPa, the tensile strength is 390-430 MPa, the transverse bending angle is larger than or equal to 75 degrees, the longitudinal bending angle is larger than or equal to 65 degrees, and the tensile strength is larger than or equal to 390 MPa. After 60% of axial compression, no through crack larger than 10 mm occurs; and meanwhile, the dual requirements of light weight and safety of the automobile are met.

The invention discloses a magnesium oxide coating performance detection system and method based on curing degree analysis, and relates to the technical field of coating performance detection.According to the magnesium oxide coating performance detection system and method, the coating effect of a magnesium oxide coating is analyzed based on the curing degree and contact adaptability, and the influence of airflow on the uniformity of the magnesium oxide coating is predicted based on airflow and silicon steel moving tracks; the curing effect of the magnesium oxide coating in the moving scene is predicted based on the influence of the environment on the curing of the magnesium oxide coating and the influence of airflow on the uniformity of the magnesium oxide coating, and the comprehensive curing condition of the magnesium oxide coating is predicted based on the coating effect of the magnesium oxide coating and the curing effect of the magnesium oxide coating in the moving scene. According to the magnesium oxide coating performance detection method, under the moving scene, the curing effect of the coating is predicted through the movement track model and airflow simulation, meanwhile, the curing condition is comprehensively analyzed in combination with the coating effect, and the precision of magnesium oxide coating performance detection is improved.

The invention provides a coating for casting an alloy steel lost foam as well as a preparation method and application of the coating. The coating comprises the following raw materials in parts by weight: 79-89 parts of aggregate, 3-7 parts of a binder, 4-7 parts of a suspending agent, 1.5-3 parts of a surfactant, 1.5-2.5 parts of a defoaming agent and 1-1.5 parts of a preservative, the aggregate is prepared from the following components in percentage by mass: 78 to 82 weight percent of bauxite, 12 to 15 weight percent of mica and 3 to 10 weight percent of quartz powder; the binder is prepared from the following components in percentage by mass: 42 to 50 weight percent of anhydrous aluminum dihydrogen phosphate, 18 to 25 weight percent of white carbon black, 12 to 17 weight percent of ethylene glycol and 8 to 28 weight percent of magnesium oxide; the coating for casting the alloy steel evanescent mode keeps good suspension property, high-temperature air permeability, coating property, high-temperature crack resistance and shedding property of the coating, the surface of a casting is smooth and free of burnt-on sand, less harmful gas is volatilized during firing, and harmful gas generated by burning of a white mold can be absorbed.

The invention discloses a nickel-magnesium intermediate alloy for a high-temperature alloy and a preparation method thereof.The nickel-magnesium intermediate alloy is composed of, by mass, 4%-50% of Mg and the balance Ni and inevitable impurities, and the method comprises the steps that firstly, electrolytic nickel and magnesium ingot raw materials are selected, cut and polished, and ingredients are calculated, weighed and subpackaged; 2, the raw materials are put into a crucible of an induction melting furnace to be smelted, and alloy melt is obtained; and thirdly, a steam suction filtration system is started, the alloy melt is poured into a cast iron ingot mold, and the nickel-magnesium intermediate alloy ingot is obtained after cooling. A proper amount of inert gas is introduced in the vacuum induction smelting process, smelting and pouring in a micro-negative pressure state are guaranteed, impurity introduction in the smelting and pouring processes is reduced by controlling smelting process parameters, meanwhile, gasification loss of the magnesium element is reduced, and the high-strength magnesium alloy with uniform components and high strength is obtained. The nickel-magnesium intermediate alloy is high in cleanliness and low in content of harmful gas elements and inclusions, and is suitable for the field of downstream high-temperature alloys.

The invention relates to a self-repairing concrete complexing agent and a preparation method thereof, and belongs to the technical field of concrete.The self-repairing concrete complexing agent is prepared from 1-4 parts of microorganism induction repairing agent, 2-6 parts of nanometer wollastonite, 10-15 parts of slow-release repairing liquid and 0.02-0.12 part of magnesium oxide. Triple repair mechanisms of microbial mineralization, chemical gel and nano-filling are fused, crack initiation and expansion to a stable whole stage are covered, the repair system is far better than a single repair system, the slow release liquid realizes on-demand release of the repair agent, one-time consumption failure is avoided, durability is improved by 50% or above, nano wollastonite and magnesium oxide micro-expansion synergistically enhance compactness, and the repair effect is good. Meanwhile, the method is compatible with an existing concrete production line, complex equipment is not needed, energy consumption is reduced, the use amount of components is small, microbial metabolism and natural minerals are further utilized, pollution of chemical expanding agents is reduced, only water triggering is needed in the repairing process, no toxic by-product is generated, and the method meets the green building material standard.

The invention relates to the field of architectural ceramics, and discloses a curved marble tile and a hot bending process thereof.The curved marble tile comprises a green body layer, and the green body layer is prepared from, by mass, 64-69% of SiO2, 18-22% of Al2O3, 0.3-0.8% of Fe2O3, 0-1% of CaO, 0-1.2% of MgO, 3-4% of K2O, 2-4% of Na2O, 0-0.5% of TiO2 and 4-6% of L.O.I; 0.1-10% of aluminum dihydrogen phosphate is additionally added into the preparation raw materials of the green body layer. The aluminum dihydrogen phosphate is added into the raw materials of the green body layer, the proportion range of oxides in the raw materials for preparing the green body layer is regulated and controlled, the silicon content is properly reduced, the aluminum content is increased, and the contents of calcium, magnesium and potassium in the formula are increased, so that a relatively low firing environment temperature can be obtained; the green body adopted in the scheme does not crack in the hot bending and firing process.

The present invention relates to the technical field of refractory materials, and in particular to a magnesium spinel hot wet gunning material, a preparation method and an application thereof. The magnesium spinel hot wet gunning material comprises: 45 wt%~60 wt% of magnesium spinel brick waste; 20 wt%~25 wt% of magnesia sand; 15 wt%~20 wt% of spinel; 5 wt%~10 wt% of α-alumina micropowder; 5 wt%~10 wt% of binder; 1 wt%~2 wt% of aluminum powder; 0.1 wt%~0.2 wt% of water reducer; 1 wt%~3 wt% of saturated polyaluminum chloride solution; the sum of the amounts of the components is 100%. The magnesium spinel hot wet gunning material has the advantages of good high-temperature mechanical strength, long service life and low production cost during use through the combination of various components, and is not easy to generate dust.

The invention relates to the technical field of magnesium ingot conveying, in particular to a discharging and conveying device and method for magnesium ingot conveying The discharging and conveying device comprises a rack, a continuous casting machine body and a conveying mechanism are vertically distributed on the rack, the continuous casting machine body is used for conveying produced magnesium ingots from left to right, and a limiting mechanism is arranged on the rack. A side scrap removing mechanism is arranged between the continuous casting machine body and the conveying mechanism, the magnesium ingot discharging angle, the optimal discharging position and the vertical sliding track can be accurately controlled, and the magnesium ingots are prevented from deviating in the conveying process; chippings and impurities on the surfaces of the magnesium ingots are brushed away, and the situation that normal conveying of the magnesium ingots is affected due to deviation of conveying of the magnesium ingots caused by blockage, blockage and clamping stagnation of chain seams of the conveying mechanism due to direct contact with the conveying mechanism after blanking is prevented; the arrangement action of a plurality of magnesium ingots required by stacking is preposed, and the situation that the magnesium ingots and a chain belt are scraped when the magnesium ingots are stacked at a processing point and wait for a stacking robot to grab the magnesium ingots is reduced.

The invention provides a purification and impurity removal method of a crude nickel-cobalt-manganese sulfate solution. The purification and impurity removal method comprises the following steps: (1) adding sodium thiosulfate into the crude nickel-cobalt-manganese sulfate solution to remove copper; (2) phosphate is adopted, the pH value is regulated, and titanium, iron, aluminum and the like are removed; (3) ferric sulfate is added, the pH value is regulated, and phosphorus and silicon are removed; (4) adding a bismuth agent and regulating the pH value to remove chlorine; (5) adding a fluorine agent to remove calcium and magnesium; and (6) adding a tillite mineral adsorbent to remove fluorine. According to the method, iron, aluminum, copper, fluorine, phosphorus, titanium, calcium, magnesium, chlorine, silicon and other elements can be efficiently removed from the rough nickel-cobalt-manganese sulfate solution, the loss of main metal is low, the prepared high-purity nickel-cobalt-manganese sulfate solution can directly meet the requirement of a precursor solution of a battery preparation level, the process is simple, the operation difficulty is low, industrial large-scale production is easy to achieve, and the method is suitable for industrial production. And the defects of the current preparation method of the high-purity nickel-cobalt-manganese sulfate solution are overcome.

The invention relates to the technical field of ceramic substrates, and provides a bending-resistant aluminum oxide multilayer ceramic substrate and a preparation method thereof. The bending-resistant aluminum oxide multilayer ceramic substrate comprises the following raw material components in parts by weight: 95-110 parts of aluminum oxide, 3-8 parts of a plasticizer, 6-12 parts of an auxiliary agent, 4-7 parts of a binder, 3-6 parts of a dispersant and 60-70 parts of a solvent, the preparation method of the additive comprises the following steps: A1, adding calcium oxide into ethanol, adding glucose, stirring until the materials are uniformly mixed, and concentrating to obtain a glucose coated material; a2, carrying out annealing treatment on the glucose coated material to obtain a carbon coated material; and A3, uniformly mixing the carbon-coated material with magnesium oxide and titanium dioxide, and carrying out ball milling to obtain the auxiliary agent. According to the technical scheme, the problem of low mechanical property of the aluminum oxide ceramic substrate in the prior art is solved.

A seamless flux-cored wire for 10CrNiCu steel for ships, applied to welding of continuous casting 907A steel for a main hull and composed of a low-carbon steel sheath and a flux core. The diameter of the wire is 1.0-1.4 mm; the filling rate of flux-cored powder is 14%-16%; measured as the mass percentage of the flux-cored wire, the flux core contains rutile, aluminum oxide, ferroboron, zircon sand, quartz, bismuth oxide, potassium titanate, sodium fluoride, electrolytic manganese, ferrotitanium, magnesium powder, manganese-silicon alloy, nickel powder, metal chromium, copper powder, and iron powder. The seamless flux-cored wire for 10CrNiCu steel for ships has the advantages of good welding performance, stable mechanical properties, good crack resistance, low diffusion hydrogen content, high moisture absorption resistance, excellent rust resistance, and the like. Also provided is a method for manufacturing the seamless flux-cored wire for 10CrNiCu steel for ships

The invention discloses an advanced treatment and recycling method for cold-rolled silicon steel magnesium oxide wastewater, and particularly relates to the technical field of wastewater treatment. Through pH adjustment, coagulation pretreatment, pre-membrane fine filtration and medicament stabilization of wastewater, stable control of inlet water quality is realized; a two-stage reverse osmosis system is combined with a dynamic flow and cross flow structure, so that the risks of concentration polarization and local stress corrosion are remarkably inhibited; by combining real-time monitoring of membrane surface pressure difference and recovery rate and an intelligent algorithm, self-adaptive optimization regulation and control of operation parameters of the system are realized; according to the method, the problems of serious membrane pollution, poor system stability, low recycling efficiency and the like in the prior art are effectively solved, and the wastewater resource utilization level and the system operation safety are remarkably improved.

The invention relates to the technical field of metal materials, and discloses a light high-strength zinc alloy and a preparation method and application thereof.The zinc alloy takes aluminum and magnesium as main alloy elements, scandium-yttrium pre-alloying components, cerium-lanthanum composite rare earth and a nano TiB2 particle reinforced phase are introduced, and grain refinement and interface strengthening are achieved through the synergistic effect of multiple components; the preparation method comprises the key processes of pre-alloy smelting, dynamic magnetic field assisted die casting, gradient aging treatment and the like, and the defects of melt oxidation and solidification are effectively controlled. The zinc alloy has low density, high specific strength, corrosion resistance and excellent surface treatment adaptability, is suitable for manufacturing of precise metal fasteners such as belt buckles, belt buckles and shoe buckles, can remarkably improve the anti-fatigue performance and appearance quality of products, meanwhile, reduces processing energy consumption and material loss, and meets the market requirements of light-weight and high-end hardware fittings.

The invention discloses a method for preparing micro-nano magnesium hydride powder, which comprises the following steps: in a vacuum environment I, heating a magnesium raw material to form magnesium steam, and simultaneously introducing trace carrier gas I; in the vacuum environment II, magnesium steam is conveyed through the trace carrier gas I to be mixed with the carrier gas II to form mixed gas, meanwhile, the mixed gas is made to rapidly flow through the injection evacuator, the magnesium steam is cooled and hydrogenated, and the micro-nano magnesium hydride powder is formed. Compared with the prior art, the gasification efficiency of magnesium is higher, the magnesium is taken away by airflow, residues in an evaporation chamber are less, the utilization rate of the magnesium is high, produced magnesium powder is directly brought into the next link through hydrogen carrier gas, the processes of passivation, bin opening, powder taking and the like are omitted, magnesium powder conveying is more efficient and safer, and the production cost is reduced. Through the pre-hydrogenation of the magnesium powder and the shearing action of the carrier gas of the high-speed hydrogen, the generated magnesium powder particles are smaller, the magnesium hydride powder particles generated after hydrogenation are smaller, the activity is better, and the technical process is easier to realize large-scale amplification and automatic control.

The invention discloses multi-source composite expansion super-early-strength concrete and a preparation method thereof. The concrete comprises a cementing material, aggregate, a water reducing agent, water and a multi-source composite expansion system. The expansion system is composed of a plastic expansion agent, a calcium sulphoaluminate early expansion source, a magnesium oxide delayed expansion source and an internal curing material. Through precise component design and function time sequence matching, a cooperative compensation network covering the whole life cycle of the concrete is constructed, a plastic expanding agent inhibits plastic shrinkage, calcium sulphoaluminate compensates early-stage self-shrinkage, magnesium oxide resists medium-and-long-term drying shrinkage, an internal curing material provides continuous moisture guarantee for the above process, and the overall performance of the concrete is improved. And the efficiency of each expansion source is excited and coupled. According to the invention, seamless and accurate shrinkage compensation from a plastic stage to a service later stage can be realized on the premise of ensuring the super early strength characteristic of the concrete, the technical problem that the super early strength concrete is easy to crack due to severe shrinkage is fundamentally solved, and the volume stability and durability of the structure are remarkably improved.

The invention provides titanium-containing anhydrous stemming for a blast furnace and a preparation method of the titanium-containing anhydrous stemming, and belongs to the technical field of refractory materials for the blast furnace. The titanium-containing anhydrous stemming for the blast furnace comprises the following raw materials: 40-60 parts of titanium corundum, 5-15 parts of silicon carbide, 10-20 parts of ferro-silicon nitride fine powder, 5-15 parts of titanium dioxide fine powder, 5-15 parts of vanadium-titanium slag fine powder, 5-10 parts of coke fine powder, 1-5 parts of monatomic silicon fine powder, 1-5 parts of ball clay micro powder, 1-5 parts of aluminum nitrate micro powder and 1-2 parts of magnesium alon micro powder. Gas-phase substances of Si (g), Al (g) and Mg (g) can be formed in the stemming at high temperature by the monatomic silicon fine powder and the MgAlON micro powder in the raw materials and react with CO and N2 in the environment to generate ceramic whiskers such as SiC, Si3N4, AlN and MgAl2O4, and the generated ceramic whiskers are distributed in a staggered manner and are filled in pores of the stemming, so that the high-temperature strength and the volume stability of the stemming are remarkably improved.

The invention discloses a method for preparing MHP by cyclic utilization of manganese precipitation post-solution, which comprises the following steps: mixing sodium hydroxide, magnesium oxide and manganese precipitation post-solution to obtain compound alkali slurry; mixing the laterite-nickel ore liquid subjected to iron and aluminum removal with the compound alkali slurry, and carrying out precipitation reaction to obtain MHP slurry; carrying out thickening treatment on the MHP slurry to obtain a dense underflow; filtering the dense underflow to obtain an MHP filter cake and filtrate; directly carrying out manganese precipitation treatment on the filtrate to obtain manganese slag and manganese-precipitated liquid; and reusing the manganese-deposited liquid in the preparation of the compound alkali slurry. According to the invention, a sodium hydroxide and magnesium oxide compounded system is utilized, so that the MHP precipitation process can be simplified to one step. And meanwhile, part of the manganese-deposited liquid is recycled to the alkali preparation process, so that the wastewater treatment cost is reduced, and the magnesium content in the MHP can be reduced by controlling the circulation amount of the manganese-deposited liquid, and the cost of preparing crystals through subsequent fine extraction of the MHP is reduced.

The invention relates to the technical field of sealing strips, in particular to an anti-aging ethylene propylene diene monomer rubber sealing strip and a preparation method thereof. Comprising the following components in parts by weight: 150-180 parts of ethylene propylene diene monomer, 60-90 parts of carbon black, 8-12 parts of white carbon black, 3-8 parts of a peroxide vulcanizing agent, 6-12 parts of zinc oxide, 12-16 parts of magnesium-aluminum hydrotalcite, 10-18 parts of a plasticizer, 1-3 parts of a crosslinking aid, 1-3 parts of calcium stearate, 1-3 parts of an anti-aging agent and 1-3 parts of a silane coupling agent. The anti-aging agent is a mixture of an anti-aging agent AN245 and an anti-aging agent MBZ. By adding the anti-aging agent, the aging resistance of the ethylene propylene diene monomer can be remarkably improved by inhibiting oxidation and delaying the aging process, a high-crosslinking-density three-dimensional network is formed through the peroxide vulcanizing agent, breakage of molecular chains at high temperature is reduced, thermal aging is delayed, and the ethylene propylene diene monomer sealing strip with excellent aging resistance is prepared.

The invention relates to the technical field of glazes, and discloses a high-performance ceramic glaze for bacteriostatic domestic porcelain and a preparation method thereof. The high-performance ceramic glaze of the antibacterial domestic porcelain is prepared from the following raw materials in parts by weight: 5 to 15 parts of albite, 20 to 30 parts of potassium feldspar, 10 to 30 parts of kaolin, 13 to 26 parts of quartz, 0.3 to 7 parts of talc, 5 to 10 parts of limestone, 2 to 5 parts of ludwigite, 0.5 to 1 part of rare earth, 2 to 5 parts of honeysuckle-loaded CuS, 1 to 3 parts of modified polysiloxane, 0.1 to 0.5 part of sodium tripolyphosphate and 0.1 to 0.3 part of carboxymethyl cellulose. The high-performance ceramic glaze for the antibacterial domestic porcelain prepared by the invention has relatively good long-acting antibacterial performance and high strength.

The invention discloses a selective desiliconization method for alkaline vanadium liquid. According to the process, magnesium-aluminum hydrotalcite prepared in advance is introduced into the alkaline vanadium liquid, the pH does not need to be regulated and controlled, silicon can be selectively adsorbed, desilicication slag is desorbed and then recycled as a desilicication agent, and a sodium silicate-containing solution can be used for preparing a water glass product. According to the method for deeply adsorbing silicon in the alkaline vanadium liquid by adopting the magnesium-aluminum hydrotalcite, various conditions of an existing process are not greatly changed, disturbance to existing industrial production is small, meanwhile, the problems that the desilicication limit of the alkaline vanadium liquid is insufficient and vanadium loss is high at present can be solved, silicon in the alkaline vanadium liquid can be reduced to 30 mg / L or below, and the requirements of vanadium products are met.

An embodiment of the present invention provides a steel material, for a pressure vessel, comprising, in weight %, 0.06-0.25% of carbon (C), 0.05-0.50% of silicon (Si), 1.0-2.0% of manganese (Mn), 0.005-0.40% of aluminum (Al), 0.010% or less of phosphorus (P), 0.0010% or less of sulfur (S), 0.001-0.03% of niobium (Nb), 0.001-0.03% of vanadium (V), 0.001-0.03% of titanium (Ti), 0.01-0.20% of chromium (Cr), 0.05-0.15% of molybdenum (Mo), 0.01-0.50% of copper (Cu), 0.05-0.50% of nickel (Ni), 0.0005-0.0050% of magnesium (Mg), 0.0005-0.0050% of calcium (Ca), 0.0020% or less of oxygen (O), and the remainder being Fe and other unavoidable impurities. A microstructure comprises in terms of area fraction 30% or less of pearlite and the remainder being ferrite. A non-metallic inclusion contains Mg—Al—Ca—O composite oxide.

The invention relates to the technical field of explosion suppression, in particular to a composite powder explosion suppressant and a design method and a preparation method thereof. The composite powder explosion suppressant is prepared from the following components in parts by mass: 20 to 25 parts of aluminum oxide, 10 to 20 parts of magnesium oxide, 20 to 30 parts of silicon dioxide, 1 to 3 parts of cerium oxide, 10 to 15 parts of potassium bicarbonate, 10 to 15 parts of sodium bicarbonate, 3 to 8 parts of gas-phase hydrophobic white carbon black and 2 to 6 parts of talcum powder. The composite powder explosion suppressant disclosed by the invention is high in explosion suppression efficiency; the metal oxide component screened through quantum chemistry calculation has good explosion suppression performance, and all the components in the composite powder explosion suppressant have a synergistic effect, so that hydrogen explosion can be effectively inhibited.

The invention provides a salt-containing solution purification method, and belongs to the technical field of wastewater treatment. Heavy metal ions in the salt-containing solution can enter an evaporative crystallization system after being subjected to the procedures of heavy metal removal, magnesium removal, calcium removal and the like, and sylvite and sodium salt with the purity of 99% are obtained. The method comprises the following specific process steps: 1, adjusting the pH value of a salt-containing solution to 7.5-8.5 by using an alkali solution, then adding a de-weighting agent, and carrying out solid-liquid separation after the reaction is completed to obtain a magnesium-containing solution; 2, adjusting the pH value of the magnesium-containing solution to 11-13 by using an alkali solution, and after the reaction is completed, carrying out solid-liquid separation to obtain a calcium-containing solution; 3, adding a precipitant into the calcium-containing solution, and obtaining an evaporation stock solution after precipitation is completed; 4, the evaporation stock solution enters an evaporation crystallization system, and potassium salt and sodium salt are obtained after two times of forced circulation. The method is simple in process and suitable for large-scale production, heavy metal ions in various salt-containing wastewater can be removed, potassium salt and sodium salt can be obtained, and deep purification and resource utilization of the salt-containing wastewater are achieved.

The invention relates to an automatic magnesium oxide coating analysis system and method, and belongs to the technical field of coating quality analysis. The method comprises the following steps: acquiring attributes of a magnesium oxide coating, an infrared spectrum and environment temperature and humidity data, and constructing a multi-source feature set; analyzing the distribution dispersion and local enrichment risk of free water based on a dynamic migration model, and analyzing the bonding weakening degree and dissociation risk of bound water based on a chemical stable state model; respectively generating free water treatment process parameters for inhibiting structural damage and combined water treatment process parameters for preventing performance degradation according to the abnormal analysis result and the coating attribute; by performing coupling influence analysis on the two types of process parameters, the balance requirements of the structural integrity and chemical stability of the coating are coordinated, an optimized process scheme is generated, and cooperative regulation is realized. According to the method, accurate identification, independent analysis and cooperative control of the free water and the bound water are realized, and the accuracy, reliability and quality consistency of coating water treatment are improved.

The invention discloses a controllable preparation method for the eutectic phase size of a medium-aluminum type zinc-aluminum-magnesium coating, which comprises the following steps of: preparing the following components in percentage by weight: 0.01 to 0.08 percent of C, less than or equal to 0.03 percent of Si, 0.15 to 0.26 percent of Mn, 0.15 to 0.26 percent of P, less than or equal to 0.01 percent of S, 0.02 to 0.06 percent of Als, less than or equal to 0.3 percent of Ti and the balance of Al; the base material is subjected to annealing treatment, zinc plating treatment and post-plating treatment after multiple working procedures, and the plating layer with the ternary eutectic structure morphology is obtained. Through optimization of base material components, the galvanizing process and the cooling process, accurate control over the eutectic phase size in the plating layer is achieved, and therefore the corrosion resistance, the adhesive force and the uniformity of the plating layer are improved.

A nanocomposite having ionic conductivity and having the general formula CuO·MgAl2O4 wherein: copper oxide (CuO) is present in an amount of from about 5 to about 15 weight percent (wt. %) of the total weight of the nanocomposite; and, CuO is present as a monoclinic crystal phase within the nanocomposite, as determined by X-ray diffraction (XRD).