6 results about "Periclase" patented technology

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 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.

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%.