2946 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 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 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 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 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 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.

The invention discloses high magnetic induction oriented silicon steel and a production method. The high magnetic induction oriented silicon steel comprises the following components in percentage by weight: 0.032 to 0.065 percent of C, 2.58 to 4.02 percent of Si, 0.014 to 0.036 percent of Als, 0.021 to 0.043 percent of Mn, 0.0015 to 0.014 percent of Nb, 0.0015 to 0.0084 percent of B, 0.0037 to 0.0081 percent of N and 0.004 to 0.015 percent of S. A large amount of B element is added, a proper amount of BN and other congenital inhibitors can be provided, the situation that primary grains are too large is effectively avoided, meanwhile, boron oxide, boric acid and borate are added into the magnesium oxide additive, an acquired inhibitor can be generated with N, an AlN + BN double-inhibitor system is formed, and the stability of magnetic performance is guaranteed; and the temperature is kept at 910-1005 DEG C for 18-25 hours, so that B is fully diffused and forms a new BN inhibitor with N, and the stability of the magnetic performance is effectively improved.

The invention provides a high-voltage low-loss dielectric material and a preparation method thereof, and relates to the technical field of high-voltage ceramic capacitors, and the high-voltage low-loss dielectric material comprises the following raw materials in parts by mass: 35-38 parts of barium titanate, 20-29.5 parts of strontium titanate, 15-17.5 parts of titanium dioxide, 9-12 parts of bismuth oxide, 3-4 parts of zirconium oxide, 0.8-1.0 part of X, 1.2-1.4 parts of antimony oxide, 1-1.2 parts of calcium carbonate and the like. The preparation method of the dielectric material comprises the following steps: 1, preparing the dielectric material; melting calcium carbonate, magnesium oxide, zinc oxide and the like, performing water quenching, and performing ball-milling granulation to obtain zinc borosilicate glass powder; uniformly mixing the zinc borosilicate glass powder with barium titanate, strontium titanate, titanium dioxide and the like, and granulating to obtain oxide powder; and tabletting and sintering the oxide powder to obtain the high-pressure low-loss dielectric material. The high-voltage low-loss dielectric material is high in dielectric constant, small in dielectric loss, high in compression strength and good in high-temperature stability, and the preparation method is simple.

The invention provides an optimization method of a magnesium slag sensible heat recovery system, which comprises the following steps: acquiring particle size distribution data of magnesium slag particles, and judging whether the problem of non-uniform particle size distribution exists or not according to a preset particle size threshold value; aiming at the problem of non-uniform particle size distribution, magnesium slag particles are classified by adopting a clustering algorithm, and the distribution areas of large particles and small particles are determined; according to the distribution area of the large particles, the rotating speed of the cooling roller is dynamically adjusted, and the accumulation probability of the large particles in the roller is reduced; the temperature change trend of the inner wall of the cooling roller is monitored in real time, and if it is detected that the local temperature abnormally rises, it is judged that local hot spots exist; when a local hot spot is detected, a spraying cooling system in the roller is started, and intensified cooling is conducted on a local area; pressure and temperature data of high-pressure and high-temperature water are collected in real time through a pressure sensor and a temperature sensor, and whether fluctuation exists or not is judged.

The invention relates to the technical field of metallurgy, in particular to a zinc-aluminum-magnesium coating preparation method capable of keeping coating integrity in a corrosion environment, alloy steel with the thickness of 1.8 mm or above is adopted, in the preparation process, a continuous annealing process adopts a three-section heating process, and an after-plating cooling process adopts a three-section variable-temperature cooling process; a plating solution adopted by the zinc-aluminum-magnesium plating layer comprises the following chemical components in percentage by weight: 9-11% of Al, 2.8-3.1% of Mg, less than or equal to 0.1% of rare earth elements, 0.1-0.2% of Si and the balance of Zn and inevitable impurities; according to the invention, the key problems of poor coating structure uniformity, contradiction between scratch resistance and self-repairing capability, limitation of super-thick coating preparation process, insufficient adaptability to extreme corrosion environment and the like of the existing zinc-aluminum-magnesium coating technology in industrial application are solved, and the coating can efficiently keep structural integrity in the industrial corrosion environment, and can be widely applied to the industrial corrosion environment. And meanwhile, the requirements of super-thick coating preparation, complex working condition adaptability and low-cost industrial production are met.

The invention discloses a fluoride-salt-free and nitrate-free cast iron enamel zirconium white glaze as well as a preparation method and application thereof, and belongs to the technical field of enamel. The zirconium white glaze is prepared from quartz, borax pentahydrate, magnesium carbonate, potassium carbonate, potassium feldspar, zinc oxide, aluminum hydroxide, calcium carbonate, zirconium silicate, sodium tripolyphosphate and lithium 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 zirconium white 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, and meanwhile, the zirconium white glaze has good porcelain surface, luster and firing adaptability, is suitable for cast iron matrixes, has the firing temperature of 740-760 DEG C and the firing time of 87-87 hours, and can be widely applied to cast iron substrates. The method can be used for producing green and environment-friendly enamel products.

A treatment process for crystallizing a metal sulfate involving pre-treating a feedstock comprising calcium, magnesium, and / or lithium impurities, the pre-treating involving pre-leaching the feedstock in the presence of a lixiviant, selectively extracting a first portion of any of the impurities from the feedstock, and forming a leached solution comprising an uncrystallized metal sulfate and any remaining impurities; and / or refining the leached solution and removing a second portion of any of the remaining impurities; and crystallizing the uncrystallized metal sulfate from the leached solution to form a crystallized metal sulfate. So processed, the crystallized metal sulfate may be battery-grade or electroplating-grade.

The invention discloses a magnesium reinforced porcelain black underglaze coloring agent as well as a preparation method and application thereof, and belongs to the technical field of underglaze coloring agents. The magnesium porcelain reinforced porcelain black underglaze coloring agent comprises the following solid components in percentage by weight: 12-15% of potassium feldspar, 9-15% of albite, 9-12% of calcite, 11-15% of quartz, 16-20% of kaolin, 1-1.2% of methyl cellulose and 31-34% of cobalt black pigment. Wherein the weight content of K2O in the potassium feldspar is greater than or equal to 10%; the weight content of Al2O3 in the kaolin is greater than or equal to 37%; and the weight content of Co3O4 in the cobalt black pigment is 15-25%. The prepared black underglaze coloring agent can be well suitable for a magnesium reinforced porcelain body and a cover glaze of a low-temperature fritted glaze, an obtained black underglaze product is full and pure in color development, the blue bleaching phenomenon does not occur after decoration firing, and meanwhile the glaze surface is free of orange color and pinholes.

The invention relates to the technical field of purification, and discloses a hydrogen purification method based on a magnesium-based solid hydrogen storage material, which comprises the following steps: S11, packaging the magnesium-based solid hydrogen storage material into a plurality of purification units, connecting the two purification units in parallel, and arranging a thermal interaction unit between the two parallel purification units to form a primary purification module; and S2, purification: introducing the low-purity hydrogen into the purification module, so that the low-purity hydrogen is respectively subjected to a hydrogen absorption reaction and a hydrogen desorption reaction for multiple times in the purification units connected in parallel, the low-purity hydrogen is purified, heat is supplied to the purification units which are subjected to the hydrogen desorption reaction through the heat interaction unit, and heat energy released by the hydrogen absorption reaction is stored. Based on the selective adsorption capacity of the solid hydrogen storage material to hydrogen, the solid hydrogen storage material is used for adsorbing hydrogen and discharging impurity gas, so that the purity of hydrogen is improved, and the heat interaction unit is used for storing heat energy released by a hydrogen absorption reaction and applying the heat energy to a hydrogen desorption reaction, so that the energy consumption in the purification process is reduced.

The invention discloses a super-early-strength shrinkage-free high-crack-resistance tunnel spraying repair material in the technical field of civil engineering materials, which comprises the following raw materials in percentage by mass: 35-45% of sulphoaluminate cement; 8%-12% of a superfine early strength admixture; 2%-3% of a calcium sulphoaluminate expanding agent; 1%-2% of a magnesium oxide-based expanding agent; 1-2% of a calcium-magnesium composite expanding agent; 10%-15% of hollow glass beads; 1.5%-2.5% of copper plated steel fiber; 0.1%-0.3% of polypropylene fiber; 25%-30% of graded quartz sand; 0.5%-1.0% of a polycarboxylic acid water reducing agent; 3%-5% of an alkali-free liquid accelerator; 0.3%-0.8% of a thixotropic agent; and 0.1%-0.3% of a thickening time control agent. According to the method, a multi-scale performance cooperative regulation system is innovatively constructed. Through accurate control of the hydration process of a gel system, a shrinkage stress multi-stage compensation mechanism and systematic integration of a fiber-matrix interface strengthening technology, the mutual restriction relationship among early strength development, volume stability and crack resistance of a traditional material is broken through.

The invention relates to the technical field of magnesium oxide activity detection, in particular to a magnesium oxide activity rapid detection method and system based on data fusion, and the method comprises the following steps: analyzing the activity attenuation trend of magnesium oxide in a storage period based on activity characteristic data and storage environment data of a magnesium oxide sample; analyzing the adhesion efficiency of the magnesium oxide coating silicon steel based on the silicon steel substrate state data, the environmental stress data and the activity attenuation trend analysis result of the magnesium oxide in the storage period; evaluating the service reliability of the magnesium oxide coating by combining an activity attenuation trend analysis result of the magnesium oxide in the storage period and an adhesion efficiency analysis result of the magnesium oxide coating silicon steel; and carrying out replacement early warning on the magnesium oxide according to the service reliability evaluation result of the magnesium oxide coating. The influence of the active state of magnesium oxide under different storage durations on the performance of the silicon steel coating can be accurately evaluated, the quality stability of silicon steel products is guaranteed, and waste of magnesium oxide materials is reduced through accurate early warning.

The invention discloses an ultralow-thermal-conductivity high-entropy rare earth disilicate ceramic material and a preparation method thereof, and belongs to the technical field of high-performance ceramics. Through a high-entropy engineering strategy, aiming at the problems of poor phase stability, high thermal conductivity and insufficient calcium-magnesium-aluminum silicate corrosion resistance of a traditional rare earth bisilicate material, a Ho-Yb-Lu-X multi-element rare earth composite system high-entropy effect regulation and control component strategy is innovatively adopted, and based on atomic radius difference, electronegativity matching and a mixed entropy effect, the high-entropy composite material is prepared. The high-entropy ceramic with the beta-type RE2Si2O7 phase structure is successfully prepared, generation of impure phases is effectively inhibited, and a compact material is obtained. The obtained material shows the ultralow thermal conductivity of 0.841 W / m.K at the temperature of 1400 DEG C, wherein the thermal conductivity is reduced by about 46% compared with that of traditional Yb2Si2O7. According to the preparation process, the sintering temperature is reduced by 50 DEG C through high-entropy component design, no complex post-treatment procedure is needed, the preparation process has the advantages of simplified process, high yield and the like, and an ideal candidate material is provided for a new generation of aero-engine thermal barrier coating.

The invention discloses an environment-friendly tundish magnesium-calcium dry material for thin-strip cast-rolling short-process steelmaking, and belongs to the technical field of refractory materials. The invention discloses an environment-friendly tundish magnesium-calcium dry material for thin-strip cast-rolling short-process steelmaking. The tundish magnesium-calcium dry material is prepared from the following raw materials in percentage by mass: 44-62.5% of magnesia aggregate, 22.5-24% of dolomite aggregate, 11-28% of magnesia fine powder and 3-5% of a binding agent, the binding agent is silica sol modified by a phosphate esterification aluminic acid ester coupling agent. The preparation method comprises the following specific steps: putting magnesia fine powder, a binding agent, magnesia aggregate and dolomite aggregate into a V-shaped mixing mill, uniformly stirring for 5 minutes, putting the stirred mixture into a mold, ramming, vibrating and molding to obtain a molded green body, curing at room temperature for 24 hours, demolding, drying at 200 DEG C for 24 hours, and carrying out heat treatment in an air atmosphere to obtain a dry material sample. According to the invention, the binding agent with good compatibility with a matrix is prepared by improving the binding agent, so that the binding agent can play a reinforcing role.

The invention relates to the technical field of grouting materials, in particular to a dynamic water environment anti-dispersion micro-expansion grouting material and a preparation method thereof. A component A of the grouting material mainly comprises the following raw materials in parts by weight: 120-160 parts of a gel material with volcanic ash characteristics, 3-5 parts of a retarder, 10-15 parts of magnesium oxide, 0.5-2 parts of citric acid, 5-8 parts of aluminum sulfate, 1-2 parts of sodium fluoride, 0.5-1 part of gelatin and 70-100 parts of water; the component B mainly comprises the following raw materials in parts by weight: 4-8 parts of polyacrylamide, 5-10 parts of polyacrylic acid derivative salt, 1-2 parts of alcohol polysaccharide, 40-100 parts of water glass and 30-50 parts of water; magnesium oxide, aluminum sulfate, gelatin and sodium fluoride in the component A are prepared into core-shell anti-dispersion particles in advance; the problems that a traditional cement grouting material is poor in anti-scouring capacity and anti-dispersing capacity, low in retention rate, poor in stone durability and the like can be solved.

The invention discloses fluoride-salt-free and nitrate-free low-temperature pearlescent glaze for steel plate enamel as well as a preparation method and application of the pearlescent glaze, and belongs to the technical field of enamel. The pearlescent glaze is prepared from quartz, anhydrous borax, titanium dioxide, magnesium carbonate, sodium tripolyphosphate, potassium carbonate, lithium carbonate, potassium feldspar, zinc oxide and V-26 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 pearlescent 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 pearlescent glaze has good porcelain surface, luster and low-temperature firing adaptability, is suitable for a steel plate matrix, has the firing temperature of 760-800 DEG C and the firing time of 10-20 minutes, and is suitable for a steel plate. The method can be used for producing green and environment-friendly enamel products.

The invention discloses anti-crack and anti-alpine concrete and a preparation method thereof, and relates to the technical field of concrete.The anti-crack and anti-alpine concrete is prepared from, by mass, 300-500 parts of low-heat Portland cement, 50-100 parts of carbon sequestration composite superfine powder and 10-20 parts of nano calcium carbonate; the magnesium oxide is calcined at the temperature of 500 to 600 DEG C, is compounded with the calcium sulphoaluminate, and is modified by a silane coupling agent; the phase change microcapsule is formed by packaging paraffin in a silicon dioxide shell layer, and the phase change temperature ranges from-30 DEG C to 10 DEG C; the microbial self-repairing capsule is characterized in that bacillus pasteurii is coated in a sodium alginate-montmorillonite composite carrier; according to the invention, the multi-dimensional performance breakthrough of the high-cold concrete is realized through gradient expanding agent compounding, fiber synergistic enhancement, phase change microcapsule temperature control and microbial self-repairing technologies. The drying shrinkage is reduced to 1.2 * 10 <-4 > by compounding magnesium oxide / calcium sulphoaluminate, the crack propagation is inhibited by a fiber network, and the initial crack threshold value is less than 0.15 mm.

The invention relates to the field of test and analysis of impurity element content of primary magnesium ingots, in particular to a method for testing impurity element content of primary magnesium ingots by ICP (inductively coupled plasma) spectrometry, which comprises the following steps: firstly adding H2O2 into a magnesium ingot sample to infiltrate the sample, then adding HCl at an interval of less than 1 minute to carry out first reaction, carrying out first heating after the reaction is finished, and then carrying out second heating, cooling to 20-30 DEG C, transferring to a volumetric flask, and fixing the volume by using third-level water to obtain a sample solution; establishing a working curve by using an ICP spectrometer and a standard solution; testing the sample solution; the ratio of the mass of the magnesium ingot sample to the volume of H2O2 to the volume of HCl is 1: (3-10): (30-54), the method fills the standard vacancy of ICP spectrometry analysis of the silicon element in the primary magnesium ingot, a reliable basis is provided for chemical component analysis of the primary magnesium ingot, the test result is surface, and the method for testing the mass fraction of the impurity elements in the primary magnesium ingot provided by the invention has the advantages of high analysis precision, simple operation, high accuracy and high reliability. The analysis period is short, and related chemical varieties are few.

A bismuth vanadate pigment comprising a bismuth- and vanadium-containing core doped with one or more of magnesium, calcium, aluminium and phosphorus, the doped core being coated with an oxidic coating comprising one or more of magnesium, calcium, aluminium and phosphorous.