424 results about "Magnesite" patented technology

The invention relates to the technical field of mineralized filter elements, particularly provides a magnesium-containing mineralized filter material, a mineralized filter element and a preparation method of the mineralized filter element, and aims at solving the problem that the service life of the magnesium mineralized filter element is shortened due to the fact that the magnesium ion release speed of the existing magnesium mineralized filter element is too high. The magnesium-containing mineralized filter material comprises modified magnesium ore and modified dolomite, wherein the mass ratio of the modified magnesium ore to the modified dolomite is (0.25-6): 1. By controlling the ratio of the modified magnesium ore to the modified dolomite, the precipitation concentration and speed of magnesium ions in water can be controlled, so that the concentration of the magnesium ions in the water can meet user requirements, and the service life of a magnesium mineralization filter element can be prolonged.

The invention relates to the field of furnace lining materials, in particular to a rapid repairing material for a tapping hole and a furnace lining of an intermediate frequency furnace. The rapid repairing material comprises the following components in parts by weight: 50-70 parts of tabular corundum, 10-20 parts of fused magnesite, 8-15 parts of alumina micro powder, 3-8 parts of nano zirconia, 5-12 parts of silicon carbide, 10-15 parts of silica sol and 2-5 parts of a reinforcing agent. Wherein the reinforcing agent is titanium calcium aluminate coated with chromium nickel boride. The tabular corundum is mainly used as an integral framework; the fused magnesite is matched with the alumina micro powder to form magnesium aluminate spinel with a high melting point; the nano zirconium oxide can fill pores and is excellent in toughness; the silicon carbide has the advantages of high hardness, high thermal conductivity and high melting point; the reinforcing agent is titanium calcium aluminate coated with chromium nickel boride, although the adding amount is small, the high-temperature strength, toughness and thermal shock resistance of the repairing material can be remarkably improved, and especially the long-term corrosion resistance can be remarkably improved.

The invention discloses a thermal shock resistant magnesia carbon brick for a steelmaking converter and a preparation method of the thermal shock resistant magnesia carbon brick, relates to the technical field of refractory materials, and aims to solve the problem that the overall service life of a furnace lining of the steelmaking converter is unbalanced due to the short service life of the magnesia carbon brick in a thermal shock concentrated area. The refractory material is prepared from the following raw materials in percentage by weight: 15 to 30 weight percent of high-purity magnesite clinker, 20 to 40 weight percent of high-purity magnesite clinker, 20 to 25 weight percent of high-purity magnesite clinker, 10 to 20 weight percent of fused magnesite, 8 to 16 weight percent of graphite, 0.5 to 1.5 weight percent of zirconium oxide powder, 1 to 3 weight percent of alpha alumina powder, 1 to 4 weight percent of antioxidant and 3 to 6 weight percent of phenolic resin. The magnesium carbon brick microstructure is constructed, the toughness mechanism is improved, the thermal shock resistance of the product is improved, and the service life of the converter lining tends to be balanced.

The invention relates to the field of refractory materials, in particular to a dry ramming mass for an intermediate frequency furnace and a preparation method thereof.The dry ramming mass is prepared from, by weight, 45-55 parts of fused corundum, 8-12 parts of fused magnesia, 15-20 parts of tabular corundum, 3-5 parts of fused spinel, 3-4 parts of activated aluminum oxide, 1-2 parts of silicon carbide, 1-2 parts of silica sol and 0.5-1 part of boric acid. 3.5-4.5 parts of a binding agent and 3-5 parts of an anti-penetrating agent; wherein the anti-penetrating agent is chromium oxide coated nickel aluminate microspheres. The invention solves the two major problems of easy penetration and thermal shock peeling of the traditional furnace lining, is especially suitable for harsh smelting environments of high manganese steel, stainless steel and the like, and has long service life and convenience in construction.

The invention discloses a sulfur iron oxide composite denitrification filler, a preparation method and application, and relates to the technical field of sewage treatment, the sulfur iron oxide composite denitrification filler comprises sulfur powder, siderite, magnesite, magnesium oxide, metal manganese, metal aluminum, nano iron, boric sludge, magnetite and a binder; wherein the sum of the addition amounts of the metal manganese, the metal aluminum and the nano iron accounts for 8-16% of the mass of the sulfur-iron oxide composite denitrification filler. The technical problems that in the prior art, strength and abrasion resistance are insufficient, and denitrification efficiency is low are solved.

The invention relates to the technical field of refractory materials, in particular to an antioxidant and application thereof in steel ladle slag line bricks, and the antioxidant comprises a Si / SiC multiphase material, modified nano Al2O3 and CaF2; the ladle slag line brick comprises an antioxidant, fused magnesite, crystalline flake graphite and phenolic resin. Si-SiC compound waste is subjected to magnetic separation and acid pickling, then a SiO2 passivation layer is formed through pre-oxidation, moisture and air in the storage period are isolated, and a titanate coupling agent is introduced to improve the wettability and compatibility with phenolic resin. P2O5 released by phosphate on the surface of the modified nano Al2O3 at a high temperature reacts with alkali (earth) metal migrated to a SiO2 oxide layer to prevent the alkali (earth) metal from forming a low-melting-point eutectic substance, CaF2 reacts with SiO2 along with temperature rise, a passivation layer is broken, internal Si and SiC are directly exposed, and boron oxide of the modified nano Al2O3 remarkably reduces activation energy and a temperature threshold value of the reaction of CaF2 and SiO2.

The invention relates to a preparation method of a refractory material, in particular to a preparation method of a high-corrosion-resistance low-carbon magnesia-carbon refractory material. The high-corrosion-resistance low-carbon magnesia-carbon refractory material is prepared from fused magnesite aggregate, fused magnesite fine powder, Ti3SiC2 powder, crystalline flake graphite, corundum slag and phenolic resin. The prepared low-carbon magnesia-carbon refractory material has excellent oxidation resistance and slag corrosion resistance, the service life of the magnesia-carbon refractory material under the large scrap ratio smelting condition can be prolonged, and the cost is reduced from the perspective of refractory raw materials, so that the low-carbon magnesia-carbon refractory material has high economic benefits, meanwhile, the carbon content of the refractory material is lower, and the cost is lower. And high-temperature industrial carbon emission can be reduced. The oxidation index of the magnesia-carbon refractory material is 20-30% after the magnesia-carbon refractory material is oxidized in an air atmosphere of 1600-1700 DEG C for 2-5 h; and after the magnesia-carbon refractory material is eroded for 1-3 hours under the dynamic slag condition of 1600-1700 DEG C, the erosion index of the magnesia-carbon refractory material is 0.5-4%.

The invention belongs to the technical field of coatings, and particularly relates to an aerogel modified reflective insulation MPC coating and a preparation method thereof. The aerogel modified reflective thermal insulation MPC coating provided by the invention is prepared from the following raw materials in parts by weight: 60 to 74 parts of magnesia, 45 to 55 parts of phosphate, 6 to 8 parts of retarder, 31 to 92 parts of thermal insulation filler, 1 to 3 parts of functional additive, 1 to 5 parts of aerogel and 48 to 84 parts of water. The aerogel modified reflective heat insulation MPC coating has excellent reflective heat insulation performance, and also has good constructability and durability.

The invention relates to the technical field of preparation of magnesium sulfate heptahydrate, in particular to a method for preparing magnesium sulfate heptahydrate from magnesite flotation tailings, which comprises the following steps: 1) crushing the magnesite flotation tailings until the granularity is less than or equal to 0.074 mm to obtain tailings powder; 2) mixing and stirring the tailing powder and sulfuric acid, and then filtering to obtain a crude magnesium sulfate solution; 3) adding sodium hydroxide into the crude magnesium sulfate solution, adjusting the pH value of the solution to 6, and filtering; 4) concentrating the concentration of magnesium sulfate to 30%-40%; (5) cooling the concentrated solution to 0-10 DEG C, and controlling the cooling speed to be 1-5 DEG C / h, so that magnesium sulfate heptahydrate is fully crystallized and separated out; 6) filtering the crystallized mixture, and separating out magnesium sulfate heptahydrate crystals; and 7) finally drying the filtered magnesium sulfate heptahydrate crystal to obtain a magnesium sulfate heptahydrate finished product. According to the method, high-purity magnesium sulfate heptahydrate can be obtained, so that the influence of tailings on the environment is solved.

The invention relates to the technical field of ladle bricks, and particularly discloses a low-aluminum refined ladle brick and a preparation method thereof.The low-aluminum refined ladle brick is prepared by mixing, by mass, 10-15 parts of fused magnesite with the particle size smaller than or equal to 0.088 mm, 30-40 parts of fused magnesite with the particle size ranging from 1 mm to 3 mm, 20-25 parts of fused magnesite with the particle size ranging from 3 mm to 5 mm, 5-8 parts of a composite binder, 2-3 parts of white clay and 0.5-1 part of carbon black; the preparation method comprises the following steps: taking fused magnesite, white clay, carbon black and a composite binder, mixing, homogenizing, carrying out mold pressing and heat treatment, and standing overnight at 45-55 DEG C, thereby obtaining the product, wherein the composite binder is obtained by mixing aluminum carbon silicide mixed powder and asphalt powder, then performing spray granulation to obtain mixed microspheres, humidifying the mixed microspheres, then mixing the mixed microspheres with pretreated silicon carbide fibers, rolling the mixed microspheres, and finally performing remelting and cooling treatment. By using the composite binder prepared by the invention, the oxidation resistance of the brick body can be improved, and the generation of microcracks can be inhibited.

The invention relates to the technical field of beneficiation of high-calcium low-grade magnesite, in particular to a flotation decalcification agent for high-calcium magnesite and a using method of the flotation decalcification agent. Aiming at the problems that magnesite and calcareous minerals are easy to inhibit synchronously during flotation and a traditional reagent is large in dosage and high in cost, the invention provides a novel flotation reagent which can inhibit the floatability of the calcareous minerals. The flotation reagent comprises an inhibitor, a collecting agent and a foaming agent, the inhibitor is methylglycine diacetic acid (MGDA) or trisodium methylglycine diacetate (MGDA-3Na), the collecting agent is sodium oleate, and the foaming agent is 2 # oil; 30 mg-300 mg of an inhibitor, 30 mg-180 mg of a collecting agent and 2 mg-7 mg of a foaming agent are correspondingly added into every 1 L of magnesite pulp; the low-calcium magnesite concentrate obtained by flotation comprises the following main components in percentage by mass: 46.0-48.5% of MgO, less than or equal to 0.4% of SiO2 and less than or equal to 0.8% of CaO; the recovery rate of the magnesite concentrate is 65%-90% by weight, and the recovery rate of MgO in the magnesite concentrate is 60%-80% by weight.

The invention relates to the technical field of magnesia carbon bricks, in particular to a preparation method of a magnesia carbon brick and a magnesia carbon brick material prepared thereof.The preparation method comprises the following steps that raw materials including, by weight, 65-70 parts of magnesium aluminate spinel, 35-40 parts of fused magnesite, 10-15 parts of carbon, 5-8 parts of an additive for blending chromium carbide, 4-7 parts of a modified zirconium vanadate agent and 3-5 parts of a binding agent are weighed; according to the magnesia carbon brick disclosed by the invention, magnesium aluminate spinel and fused magnesia are matched with carbon and the binding agent, the additive for blending chromium carbide and the modified zirconium vanadate agent are added for mutual blending and synergistic effect, and the raw materials are co-blended and co-blended, so that the obtained magnesia carbon brick product has excellent fracture toughness, compression strength and oxidation resistance; and the product performance can be harmoniously improved, and the product is resistant to different degrees of corrosion stability.

The invention discloses a method for determining and analyzing primary and secondary elements in dolomite and magnesite based on ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry), and relates to the technical field of determination and analysis of the primary and secondary elements, the method comprises the following steps: obtaining determination samples of the dolomite and the magnesite, pretreating the determination samples, obtaining spectral line interference conditions of each element based on the determination samples, and determining the spectral line interference conditions of the elements based on the spectral line interference conditions; the method comprises the following steps: pre-processing measured data, drawing a calibration curve of each element, obtaining the interference condition of the calibration curve of each element, and carrying out ICP-AES measurement on the pre-processed measured data to obtain a characteristic spectral line. According to the method, the source and the influence degree of the interference spectral line are determined by analyzing the spectral line interference condition, then targeted measures are adopted for correction, and meanwhile, concentration measurement deviation caused by chemical interference, physical interference, ionization interference and other factors is found by evaluating element concentration interference factors, so that the accuracy of the concentration measurement is improved. And correction is carried out by means of optimizing a sample pretreatment method, adjusting instrument working conditions and the like, so that the reliability and the stability of the analysis method are improved.

The invention relates to the technical field of refractory materials, in particular to a method for producing magnesia carbon bricks from low-carbon reduced magnesia. The method comprises the following steps: respectively weighing 80-90 parts by weight of magnesia, 3-5 parts by weight of a function enhancer, 1-3 parts by weight of aluminum powder, 0.3-1 part by weight of aluminum nitride, 2-3 parts by weight of carbon black, 3-5 parts by weight of crystalline flake graphite and 3-5 parts by weight of phenolic resin for later use; mixing the magnesite except the fine magnesite with phenolic resin, uniformly mixing, adding the rest raw materials, uniformly stirring at a low speed, adding the fine magnesite, and uniformly stirring at a high speed to obtain mixed slurry; and injecting the mixed slurry into a prepared mold, and sequentially carrying out compression molding and heat treatment to obtain the magnesia carbon brick. The magnesia carbon brick produced by the invention not only has excellent mechanical properties, but also has excellent thermal shock resistance stability and oxidation resistance; the quality of the produced magnesia carbon brick is effectively guaranteed, and meanwhile the service life of the magnesia carbon brick is prolonged to a certain degree.

Equipment for crushing and grading magnesium oxide comprises a composite grading machine, a striking crushing and stripping machine, a spiral feeding machine, a circulating fan, a cyclone separator, a bag-type dust collector and an air compressor, and is characterized in that a crushing and grading unit is upgraded and grafted on the magnesium oxide crushing and grading equipment by utilizing the air flow advantage of closed-loop circulating air; on the basis of ensuring that the content of MgO is not reduced due to the influence of moisture and CO2 in air in the crushing and grading process, heavy MgCO3 fine powder and coarse MgO powder in raw powder are separated and graded to the maximum extent, and a low-grade magnesium oxide product containing a small amount of MgCO3 is obtained through an outlet of a 1 # air-lock valve of a composite grading machine; a high-grade magnesium oxide fine powder main product is obtained through an outlet of a second air-lock valve of the cyclone separator, and a high-grade magnesium oxide superfine powder product is obtained through an outlet of a third air-lock valve of the bag-type dust collector. By adopting a simple mode of coarse particle stripping shell shrinkage crushing instead of coarse particle grinding, the non-calcined magnesite powder is prevented from entering the fine powder, and the amount of the magnesium oxide fine powder is also increased. Operation is simple and easy to control, productivity efficiency is high, production is safe and environmentally friendly, and market application prospects are wide.

The invention relates to the technical field of refractory materials, in particular to a preparation process of hydration-resistant synthetic magnesia-calcium sand. Comprising the following steps: 1) grinding dolomite and magnesite into fine powder with the granularity of 200 meshes; (2) adding the workmanship dolomite fine powder and the magnesite fine powder in the step (1) into a high-speed mixing mill, adding cerium oxide and iron oxide red powder, and fully mixing; 3) adding water accounting for 22-38% of the total weight of the mixed material, and mixing for 45-60 minutes to obtain uniform wet powder without dry powder; (4) pressing the uniform wet powder into wet green bricks by using a brick press; (5) putting the wet green bricks into a drying kiln, drying for 24-30 hours at the drying temperature of 50-80 DEG C, and sintering in a high-temperature sintering device; the firing temperature is 1600 to 1700 DEG C; and 6) crushing the sintered green brick to finally obtain the magnesia-calcium sand. The magnesia-calcium sand prepared by the invention has good hydration resistance and high-temperature usability.

The invention provides a refractory ceramic-based material for a smelting furnace lining and a preparation method of the refractory ceramic-based material, and belongs to the technical field of ceramic refractory materials. The material comprises coated modified fused magnesite main aggregate, ceramic sand main aggregate, surface coated magnesium oxide fine powder, gamma-phase aluminum oxide micro powder, an aluminum dihydrogen phosphate solution, alkaline silica sol, a pre-reaction spinel precursor and zirconium boride micro powder. The coated modified fused magnesite main aggregate is prepared by mixing and sintering fused magnesite, silicon carbide composite powder, chromium sesquioxide powder and phenolic resin powder. And mixing the silicon carbide powder and the magnesium oxide powder, and depositing a silicon nitride layer on the particle surface to prepare the silicon carbide composite powder. The surface-coated magnesium oxide fine powder is formed by coating the surfaces of magnesium oxide fine powder particles with aluminum oxide. The pre-reaction spinel precursor is prepared by the following steps: preparing a mixed salt solution from magnesium nitrate hexahydrate and aluminum nitrate nonahydrate by using deionized water, reacting, aging and carrying out heat treatment. And the ceramic sand main aggregate is made of zirconium oxide. And all the layers are matched for use to realize balanced improvement of performance.

The invention provides anti-crack foam concrete as well as a preparation method and application thereof, and belongs to the technical field of building materials. The added quick lime can generate a certain micro-expansion effect when encountering water, shrinkage of the material caused by hydration can be compensated to a certain extent, an alkaline environment can be provided for the foaming agent, and smooth foaming is guaranteed; the magnesite tailing powder is added, so that dicalcium silicate, tricalcium silicate and periclase crystal phases with relatively high fire resistance can be obtained when a fire disaster occurs; the phosphogypsum is added as an activator of the coal gasification slag, so that the hydration induction period is shortened, the later strength development is promoted, and the crack resistance of the foam concrete is improved; the modified fibers are added, the fibers form an irregular supporting structure in the multi-bubble slurry to play a role in protecting the foam, meanwhile, the fibers can improve the pore structure and also have an effect of hindering microcrack propagation, and the three fibers have a synergistic effect, so that the crack resistance of the foam concrete is improved.

The invention discloses a steel ladle slag line magnesia carbon brick masonry positioning device, and particularly relates to the technical field of steel ladle slag line masonry, the steel ladle slag line magnesia carbon brick masonry positioning device comprises a supporting ring located above a steel ladle, a positioning masonry assembly is arranged at the bottom of the supporting ring, and the positioning masonry assembly comprises a first gear ring arranged at the bottom of the supporting ring; and the bottom of the first gear ring is fixedly connected with a reinforcing ring. A first motor drives a gear ring to transmit and drives a reinforcing ring to rotate, all hinge blocks drive a masonry pressing plate to deflect synchronously in the same direction by means of sliding fit of an inclined guide groove and a sliding column, the masonry pressing plate forms circumferential synchronous pressurization on a brick ring through an abutting arc plate, it is ensured that the brick ring bears uniform pressure in the whole circumferential direction, and the construction efficiency is improved. The problem that local pressure is not uniform in manual masonry is solved, a core foundation is laid for forming a stable self-locking structure for the brick ring, meanwhile, mechanization of pressurization operation is achieved, manual pressurization is replaced, and the labor intensity of foundation pressurization is greatly reduced.

The invention relates to the technical field of aluminum-magnesium spinel bricks, in particular to a production process and application of an aluminum-magnesium spinel brick material, and the production process comprises the following steps: weighing the following raw materials in parts by weight: 30-35 parts of corundum, 8-12 parts of aluminum-magnesium spinel, 6-10 parts of a doped filler, 5-8 parts of a coordinating additive, 4-7 parts of magnesia powder, 3-5 parts of aluminum oxide and 1-3 parts of a binding agent. According to the aluminum-magnesium spinel brick material disclosed by the invention, the corundum is matched with the aluminum-magnesium spinel, the magnesia powder, the aluminum oxide and the binding agent raw materials, and meanwhile, the doped filler and the coordinating additive are added as blending and coordinating raw materials, so that the prepared aluminum-magnesium spinel brick realizes coordinated improvement of apparent porosity performance, wear resistance and pressure resistance; and the product has remarkable water resistance and cold and heat resistance stability.

The utility model relates to the technical field of magnesite flotation, in particular to a magnesite flotation tailing defoaming device, which is characterized in that a feed port and a discharge port are respectively arranged at the upper end and the lower end of a defoaming tank in a penetrating manner; the top end of the rotating rod is rotationally connected into the defoaming tank through a bearing, the motor is fixedly arranged on the top surface of the defoaming tank, the output end of the motor is connected with the end part of the rotating rod, the motor is connected with an external power supply, and defoaming paddles are fixedly arranged at the bottom end of the rotating rod; a plurality of drainage blades are fixedly arranged on the rotating rod at equal angles and are positioned above the defoaming paddles; the drainage tube is arranged on the rotating rod in a sleeving mode through a plurality of supporting rods, and the drainage blades are located in the drainage tube. The drainage assembly is arranged at the bottom end of the drainage pipe, and the defoaming paddle is located in the drainage assembly; according to the defoaming device, foam liquid is drained to the defoaming blades through the matching effect of the drainage blades and the drainage pipes, and foam can be effectively broken through special design in cooperation with the shapes and the materials of the blades, so that the defoaming efficiency is improved.

The invention discloses a multi-component magnesium refractory aggregate using copper slag flotation tailings as raw materials and a preparation method thereof, the multi-component magnesium refractory aggregate is obtained by using copper slag flotation tailings powder, light-burned MgO powder, magnesite powder and alpha-Al2O3 powder as raw materials through compression molding and calcination. The preparation method comprises the following steps: mixing the copper slag flotation tailing powder, the light-burned MgO powder, the magnesite powder and the alpha-Al2O3 powder in a mixer to obtain mixed powder; adding a binding agent solution into the mixed powder, and performing mechanical pressing to obtain a green body; and heating the formed green body to 950-1150 DEG C, preserving heat for 4-6 hours, finally heating to 1480-1580 DEG C, preserving heat for 4-6 hours, cooling, crushing, and screening to obtain the multi-component magnesium refractory aggregate. According to the method, the copper slag flotation tailing powder is used as the raw material, resource utilization of the copper slag flotation tailings is achieved, and the obtained multi-component magnesium refractory aggregate is suitable for a cement rotary kiln.

The invention relates to the technical field of spinel bricks, in particular to a refractory aluminum-magnesium spinel brick material and a preparation method thereof.The refractory aluminum-magnesium spinel brick material is prepared from, by weight, 35-40 parts of fused magnesite, 20-30 parts of aluminum-magnesium spinel, 10-15 parts of mullite-doped modified external auxiliaries, 7-11 parts of stabilizing materials, 6-10 parts of high-aluminum micro powder and 3-6 parts of external binding agents. According to the aluminum-magnesium spinel brick material disclosed by the invention, the fused magnesia and the aluminum-magnesium spinel are matched with the high-aluminum micro powder, the binding agent is additionally added, and meanwhile, the added mullite-doped modified external additive and the stabilizing material are mutually blended and synergized, so that the strength, the wear resistance and the heat insulation of the obtained aluminum-magnesium spinel brick material are harmoniously improved; and the product has obvious fire-resistant and alkali-resistant erosion stability effects.

The invention discloses a method for improving hydrogen-based reduction-electric furnace melt separation efficiency of vanadium titano-magnetite, which comprises the following steps: (1) mixing the vanadium titano-magnetite with slaked lime, magnesite, bentonite and water to obtain a mixture, and pelletizing to obtain green pellets; the addition amount of the slaked lime and the magnesite is controlled to enable the binary alkalinity of the mixture to be 0.4-0.6 and the quaternary alkalinity to be 0.6-0.8; (2) the green pellets are dried and roasted, and oxidizing pellets are prepared; (3) the oxidizing pellets are subjected to hydrogen group reduction, and DRI containing vanadium and titanium is obtained; and (4) adding the DRI into an electric furnace, and then adding carbon for melt separation to obtain vanadium-containing molten iron and titanium-containing slag. According to the method, calcium and magnesium are added into the pellets, the ore phase structure of the vanadium-titanium ore pellets is changed, the reducibility of the vanadium-titanium magnetite pellets is improved, the vanadium-titanium DRI metallization ratio is increased, additional flux does not need to be added in the DRI melt separation process, the vanadium-titanium yield is larger than 92%, and the method has good application prospects.

The invention relates to the technical field of sintered ore production, in particular to a sintering mixture and a preparation method thereof.According to the method, a large proportion of iron-containing dust sludge is adopted as a raw material to prepare the sintering mixture, and the sintering mixture comprises mixed iron-containing dust sludge, iron ore concentrate, fine ore, coke powder, magnesite powder and slaked lime powder; the mixed type iron-containing dust mud comprises blast furnace gas mud, converter mud and sintering machine tail dedusting ash, and the weight percentage content of the blast furnace gas mud, the converter mud and the sintering machine tail dedusting ash is 20%-25%: 8%-15%: 65%-70%. The method has the beneficial effects that the problems that the sintering mixture is poor in strength and unreasonable in particle size composition due to the fact that the iron-containing dust mud is directly used as the raw material for preparing the sintering mixture, and the yield and quality of sintered ore are deteriorated are solved.

The invention discloses a modified phenolic resin combined steel ladle brick and a preparation method thereof, and relates to the technical field of tundish refractory materials, the steel ladle brick comprises the following raw materials: 90-93 wt% of main aggregate, the main aggregate comprises fused magnesite, tabular corundum and recycled corundum, and the main aggregate comprises magnesium oxide, magnesium oxide and aluminum oxide; wherein the content of the fused magnesite is 75-85%, the content of the tabular corundum is 1-6%, the content of the recycled corundum is 5-9%, the content of the crystalline flake graphite is 8-10%, the content of the composite binding agent is 3-5%, the composite binding agent is composed of 80% of modified phenolic resin liquid and 20% of common phenolic resin, the antioxidant is 1-2%, the auxiliary binding agent is 1%, and the auxiliary binding agent is calcium lignosulphonate. By adopting the modified phenolic resin, adding the crystalline flake graphite, introducing the recycled corundum and mixing step by step, the oxidation resistance, the thermal shock stability, the erosion resistance and the high-temperature stability of the ladle brick are improved, the cost is reduced, and the service life is prolonged.

The application discloses a multi-channel shaft kiln for calcining magnesite, wherein a distributing vehicle and a discharging device are located at the top and bottom of a kiln body. The kiln body is provided with a preheating section, a calcining section and a roasting section from top to bottom, and square strip-shaped channels are arranged in the kiln. A combustion chamber is arranged in the furnace wall on both sides of the calcining section with a width of 40-80 cm, the combustion chamber is built by hollow integral combustion bricks, the combustion chamber is communicated with the calcining section by cross-distributed through holes, the through hole outlet is downwardly inclined, and an inclined convex block is arranged at the top. The lower part of the roasting section is provided with an upper collecting opening and a lower expanding opening structure, an air pressure pipe is arranged in the inclined brick of the upper collecting opening, the opening of the air pressure pipe is downwardly inclined and communicated with the roasting section, and the lower expanding opening is matched with the upper semicircular surface of the discharging device. The middle part of the upwardly inclined distributing main pipe of the distributing vehicle is communicated with the branch pipe which is inclined and changed in direction, and a change valve is arranged in the main branch pipe. The application provides a comprehensive solution of the shaft kiln with high calcining quality, energy saving, low investment and long service life for calcining magnesite, and can also be used for high-quality calcining of small-particle materials.

The application discloses a kind of mixed mineral materials and methods for promoting long-term storage of sediment organic carbon, the material is composed of a certain proportion of serpentine and magnesite, steps are: 1) select mineral material serpentine and magnesite as raw material;2) serpentine and magnesite are pretreated;3) the serpentine and magnesite after pretreatment are mixed according to certain proportion;4) the mixed mineral material is spread to sediment surface with certain thickness;5) through the reaction of mixed mineral material and sediment organic carbon to generate stable magnesium carbonate mineral, realize long-term storage of sediment organic carbon in situ.The mineral material in the application has the characteristics of environmental friendly, reasonable formula, convenient to use, ecological environmental protection and the like.The application realizes long-term storage of sediment organic carbon in situ by the reaction of mixed mineral material and organic carbon, provides new ideas for water ecological restoration engineering to help carbon neutralization and realize sediment in situ carbon storage.

The utility model relates to the technical field of calcining furnaces, in particular to a microwave heating high-temperature circulating flash calcining furnace, which comprises a cylindrical furnace body, a strong wave-transparent layer arranged on the inner wall of the cylindrical furnace body, a fire-resistant furnace lining arranged on the inner wall of the strong wave-transparent layer, a microwave generator arranged on the periphery of the cylindrical furnace body, and a preheater connected with the upper end of the cylindrical furnace body, a dust removal assembly is arranged above the preheater, and a discharging machine is arranged at the lower end of the cylindrical furnace body and connected with a cooling machine. According to the utility model, the microwave generator is used for calcining magnesite, dolomite, limestone, kaolin, clay, illite and the like, can be used for calcining in a reduction furnace or a vacuum reduction furnace, and is also suitable for high-temperature and ultrahigh-temperature flash sintering high-grade refractory materials; the device has the advantages of low investment cost, small occupied area, high resource utilization rate and the like.

The energy-saving calcining equipment comprises a bottom plate, the top of the bottom plate is fixedly connected with a placing table through a support, the top of the placing table is fixedly connected with a calcining furnace body, and the right end of the top of the placing table is fixedly connected with a water tank; an inner cavity of the water tank is fixedly connected with a curved pipe through a support, the top of the water tank is fixedly connected with a purification box, a purification groove is formed in an inner cavity of the purification box, a dust filter screen is arranged on the upper portion of an inner cavity of the purification groove, and an activated carbon filter screen is arranged in the middle of the inner cavity of the purification box. According to the calcining furnace disclosed by the utility model, suction force can be generated by electrifying through the fan, so that air in the purification tank can be extracted, smoke exhausted by the calcining furnace body can enter the purification tank under the action of the connecting pipe, dust can be filtered by utilizing the dust filter screen, and the smoke can be purified by utilizing the activated carbon filter screen; therefore, an environment-friendly effect is achieved.