13 results about "Periclase" patented technology

This invention relates to the field of high-efficiency expansive agent technology, and in particular to a slow-release high-efficiency expansive agent for concrete, its preparation method, and its application. The method includes the following steps: crushing limestone, bauxite, hematite, gypsum dihydrate, magnesite, and silica, then ball-milling and sieving to obtain a mixed raw material powder; heating to 650-850℃ and holding for 20-40 minutes, then raising the temperature to 950-1200℃ and holding for 30-60 minutes, continuing to raise the temperature to 1250-1300℃ and holding for 40-70 minutes, and finally cooling to 150-200℃ to obtain clinker; mixing the clinker powder with anhydrite until uniform, adding admixtures and a hydration regulator / activator, and grinding; adding a slow-release coating agent via high-pressure atomization spray, and stirring to obtain a fine mixed powder; mixing and aging in a homogenization chamber to obtain the slow-release high-efficiency expansive agent. The slow-release high-efficiency expansive agent of the present invention gradually generates calcium hydroxide and ettringite crystals to provide efficient compensation when the cement hardened body begins to shrink, and achieves continuous micro-expansion throughout the process by relying on later expansion sources such as periclase.

The invention belongs to the technical field of building materials, and particularly relates to an active magnesium oxide-based carbon sequestration cementing material as well as a preparation method and application thereof. The active magnesium oxide-based carbon sequestration cementing material disclosed by the invention is prepared from the following mineral components: 5wt%-22wt% of periclase, 65wt%-80wt% of calcite and 0-5wt% of lime. The active magnesium oxide-based carbon sequestration cementing material contains active magnesium oxide, is good in carbonization activity, and can be used for preparing carbonized products with relatively high strength.

This invention relates to the field of refractory materials, and provides a production process and equipment for magnesia-carbon bricks, including a main frame. The upper surface of the main frame is provided with a coating structure, which includes a rotary motor, a rotary motor, and a coating frame. The main components of the magnesia-carbon bricks of this invention are periclase particles, graphite powder, atactic polypropylene modified bitumen, silicon carbide particles, and aluminum powder. By using the combination of rotary motors one and two, and with the design of a brush and an adjustable rotation structure, the brush can repeatedly coat the magnesia-carbon brick mold, and the angle and range of the coating can be directly controlled, thereby improving the coating uniformity and coating thickness, and enhancing the high-temperature resistance of the magnesia-carbon bricks.

The invention discloses a high-alkali high-magnesium Portland cement clinker and a preparation method thereof, the alkali content in the clinker is greater than or equal to 1.5% in terms of sodium equivalent, and the alkali in the clinker exists in the form of potassium feldspar and albite; the content of magnesium oxide in the clinker is greater than or equal to 4.5%, and all magnesium oxide is dissolved in clinker minerals; the raw material of the clinker comprises a reduction synergist, the reduction synergist is electrolytic aluminum overhaul slag, and the addition proportion of the electrolytic aluminum overhaul slag accounts for 0.1-0.3% of the total raw materials. The electrolytic aluminum overhaul slag is introduced, decomposition of alkali-containing mineral phases such as RC23S12 and RC8A3 is promoted, R2AS3 feldspar minerals are formed, the content of silicate minerals is increased, and the performance of the clinker is improved; meanwhile, the melting amount of magnesium oxide in clinker minerals is increased, formation of periclase is eliminated, and expansion damage is avoided; the negative influence of alkali and magnesium on the performance of the clinker is avoided, the application range of the high-alkali and high-magnesium calcareous raw material is expanded, and efficient utilization of resources is realized.

A method for predicting autogenous volume expansion deformation of magnesium oxide expansion agent in concrete, which is characterized by the following steps: constructing an initial prediction model of autogenous volume expansion deformation of magnesium oxide expansion agent, wherein the initial prediction model takes the hydration degree and the mixing amount of the magnesium oxide expansion agent in the concrete, the periclase content and the internal pore volume ratio of the magnesium oxide expansion agent, and the elastic modulus of the concrete as independent variables, and the specific expression is as follows: the method can be used for quantitatively predicting the influence of the type, the mixing amount, the microstructure and the hydration behavior of the magnesium oxide expansion agent on the expansion deformation of the concrete, and can be used for predicting the deformation history of the concrete mixed with the magnesium oxide expansion agent under the actual engineering temperature and humidity history, thereby laying a theoretical foundation for the expansion history design and application of the magnesium oxide expansion agent for meeting the shrinkage compensation requirement of the engineering concrete.

This invention belongs to the field of specialized equipment for building material production, and discloses a smelting device for recycling and reprocessing periclase from magnesium ore waste. The device includes a waste pretreatment unit, a multi-channel centrifugal sedimentation density distribution acquisition unit, an intelligent sorting decision unit, a sorting execution mechanism, a smelting reactor, and a process feedback control module connected in sequence. The density distribution acquisition unit obtains the equivalent density of particles through centrifugal sedimentation; the intelligent sorting decision unit extracts a five-dimensional density difference feature vector, adaptively adjusts the classification boundary using a support vector machine, and combines improved hierarchical clustering to achieve dynamic particle grouping and screen for high-purity components; the process simulation interface embeds a thermodynamic-kinetic coupled model to pre-simulate the smelting quality, and inversely optimizes the feature weights when a batch is determined to be a challenging recycling batch. This invention solves the problem of insufficient sorting accuracy caused by the nonlinear mapping between density and chemical purity, and improves the purity stability of periclase products.

The present application belongs to the field of ceramic materials, and particularly relates to a kind of foamed ceramic foamed by boron carbide and a preparation method thereof, wherein the foamed ceramic takes quartz sand as a main body material, takes sodium carbonate as a fluxing agent, takes periclase and albite or potassium feldspar as a viscosity regulator, takes iron oxide as an oxidizing agent, and takes boron carbide as a foaming agent; the sintering temperature is 810-890 DEG C; and the sintering time is 35-65 min. The present application also discloses a preparation method of the above-mentioned foamed ceramic, which has the remarkable advantage of low sintering temperature and far lower manufacturing cost than the prior art. The foamed ceramic prepared by the present application has high total porosity, closed porosity and compressive strength, and has excellent heat preservation, sound insulation, waterproof and moisture-proof performance due to the fact that the pores in the foamed ceramic are independent and not connected with each other.

The present application relates to a kind of lightweight periclase-carbon refractory with multi-scale core-shell structure and preparation method.The technical scheme is:16-24wt% of microporous periclase refractory aggregate I,22-32wt% of microporous periclase refractory aggregate II and 16-24wt% of microporous periclase refractory aggregate III are total aggregate,24-38wt% of magnesia powder,0.1-1.5wt% of elemental silicon powder and 0.5-3wt% of flake graphite powder are total matrix.First, total aggregate is placed in the mixer,2-6wt% of modified liquid thermosetting phenolic resin is added to total aggregate and total matrix, and mixed evenly;Then, total matrix is added, stirred;Machine is pressed into shape, 200-320 ℃ is kept for 12-36h, and the lightweight periclase-carbon refractory with multi-scale core-shell structure is prepared.The product has the characteristics of multi-scale core-shell structure, low thermal conductivity, high strength, good thermal shock stability and strong erosion resistance.

The present application relates to a kind of lightweight periclase-magnesium aluminate spinel-carbon refractory and its preparation method.The technical scheme is:20-25wt% of the porous periclase-magnesium aluminate spinel refractory aggregate I,18-23wt% of the porous periclase-magnesium aluminate spinel refractory aggregate II and 15-22wt% of the porous periclase-magnesium aluminate spinel refractory aggregate III are total aggregate,31-45wt% of magnesia fine powder,0.1-1.5wt% of elemental silicon powder and 0.5-3.5wt% of flake graphite powder are total matrix.The total aggregate is placed in the mixer first,add 2-6wt% of modified liquid thermosetting phenolic resin which is the sum of total aggregate and total matrix,uniformly mix,then add total matrix,agitate,press into shape,keep at 180-300 DEG C,obtain lightweight periclase-magnesium aluminate spinel-carbon refractory.The product has the characteristics of multi-scale core-shell structure,low thermal conductivity,excellent thermal shock resistance,excellent erosion resistance and good oxidation resistance.

The present application relates to a kind of light periclase-magnesia-alumina spinel refractory and its preparation method.The technical scheme is:10-15wt% modified microporous refractory aggregate I,21-30wt% modified microporous refractory aggregate II and 9-11wt% modified microporous refractory aggregate III are modified microporous refractory aggregate,8-15wt% spinel fine powder and 31-38wt% magnesia fine powder are matrix.First, modified microporous refractory aggregate is placed in a blender, plus 3-8wt% sulfurous acid paper pulp waste liquid of the sum of modified microporous refractory aggregate and matrix, stirring;Then add matrix, stir, under the condition of 150-200MPa, dry, then heat to 1300-1600℃ at a rate of 3-8℃ / min, keep warm for 3-8h, with furnace cooling, to obtain light periclase-magnesia-alumina spinel refractory.The product has nanometer pore-containing multi-scale core-shell structure, low thermal conductivity, high strength, excellent anti-erosion penetration performance and thermal shock stability.

The application relates to a light periclase-zirconite aggregate with a core-shell structure and a preparation method thereof.The technical scheme is as follows: 84.0-96.0 wt% of magnesium hydroxide powder and 4.0-16.0 wt% of zirconite powder are used as raw materials, 2.0-5.0 wt% of aluminum hydroxide powder and 2.5-5.0 wt% of polyvinyl alcohol of the raw materials are additionally added, stirring is carried out, forming is carried out, drying is carried out, then the temperature is kept at 800-1100 DEG C for 1-3 hours, then the temperature is kept at 1400-1600 DEG C for 1-4 hours, cooling is carried out, crushing is carried out, screening is carried out, and packaging is carried out, so that the light periclase-zirconite aggregate with a core-shell structure is prepared.The light periclase-zirconite aggregate with a core-shell structure prepared by the application has the characteristics of high closed-pore porosity, small pore size, high strength, low thermal conductivity, excellent thermal shock resistance and excellent corrosion resistance.

The application discloses a kind of calcium materials special for autoclaved aerated concrete and a preparation method thereof, the calcium materials include: 90~96wt% limestone, 2~6wt% iron raw materials, 0~2wt% gypsum, 0~2wt% silicate material, its mineral includes by mass ratio: f-CaO content is 42~55wt%, C4A3S content is 0~3wt%, the sum of C2S, C3S content is 22~45wt%, the sum of C3A, C4AF content is 5~20wt%, periclase content is 0~1.5wt%, gypsum content is 0~2wt%, other impurity mineral content is 0~6wt%.The application optimizes mineral component, especially controls the content and activity of f-CaO, guarantees the content of silicate mineral, so that mineral component ratio is beneficial to the process production and quality control of aerated concrete;Through low-temperature calcination of new dry method kiln, improve the utilization rate of calcium raw material, reduce energy consumption.

This invention aims to improve the corrosion resistance and thermal shock resistance of refractory materials and refractory components used in continuous casting. Specifically, the refractory material of this invention contains 10% to 30% by mass of free carbon, and the remaining main mineral phase is composed of one or more minerals selected from corundum, spinel, and periclase, wherein the periclase content is less than 40% by mass, and the combined content of silicon dioxide and silicon carbide is less than 15% by mass. When the portion of the refractory material excluding the free carbon component is taken as 100% by volume, refractory particles with a particle size greater than 0.3 mm account for 20% by volume and refractory particles with a particle size of 0.045 mm or less account for 3% to 30% by volume. Among the refractory particles in this refractory material, at least around the largest coarse particles, there exists a generally continuous void layer with a shape similar to the coarse particles. The apparent porosity of the refractory is less than 16%, and the maximum coefficient of thermal expansion up to 1500°C is less than 0.6%.