11 results about "Calcium sulphide" patented technology

The application relates to a modified chrome-corundum ramming mixture and a preparation and construction process, and belongs to the technical field of chrome-corundum ramming mixtures. The ramming mixture comprises A material, B material and C material, the A material comprises chrome-corundum aggregates, titanium dioxide-coated alumina microspheres, calcium sulfide dihydrate and porous silicon carbide microspheres; the B material comprises chromium oxide-zirconium oxide composite nano powder, sodium thiosulfate pentahydrate, tricalcium phosphate and hexagonal boron nitride flaky crystals; and the C material comprises an aluminum dihydrogen phosphate-magnesium hydroxide compound, a calcium fluoride-alumina eutectic body and a silane coupling agent. The preparation process comprises pretreatment of components, preparation of composite powder and layered preparation; and the construction process comprises the steps of pretreatment, wet mixing, layered ramming, negative pressure infiltration, medium-temperature reaction, spraying and curing and overall sintering. The application can effectively inhibit the generation of hexavalent chromium, significantly improve the thermal shock resistance, mechanical strength and heat conduction performance of the material, and has the advantages of good environmental protection, long service life, excellent construction performance and the like.

The invention belongs to the technical field of metallurgy, and particularly relates to a cleanliness control method for medium-carbon aluminum-containing and sulfur-containing structural steel for an automobile transmission shaft. According to the medium-carbon aluminum-containing sulfur-containing structural steel, the technological process of converter-LF refining furnace-RH vacuum treatment furnace-continuous casting is adopted, the alkalinity of refining slag is controlled by determining the type of deoxidation materials in the converter tapping and LF process, the binary alkalinity of refining final slag is controlled to be 3.5-4.0, and the slag deoxidation and inclusion adsorption capacity is enhanced; in the LF process, through a calcium treatment process, aluminum oxide and other impurities difficult to float upwards are subjected to denaturation treatment, and the situation that a large number of calcium sulfide impurities more difficult to remove are generated due to improper calcium treatment is avoided; in the continuous casting process, nozzle nodulation is controlled through nozzle argon blowing, slow pulling speed and other operations. And finally, the castability of the molten steel is improved, meanwhile, non-metallic inclusions of rolled metal are effectively controlled, the flaw detection qualification rate is increased, and meanwhile the product crack occurrence rate of a user is effectively reduced.

The invention discloses an efficient adsorption underwater ecological desilting material and a preparation method thereof, and belongs to the technical field of adsorbents, activated charcoal is used as a carrier, calcium sulfide is coated on the surface, MOF-zinc is used as a middle buffer layer, calcium chloride dihydrate is used as a calcium source on the outermost layer to regenerate an amorphous porous calcium carbonate coating layer, and the adsorbent is prepared. The MOF-zinc intermediate buffer layer and the amorphous porous calcium carbonate layer on the outermost layer have the porous property, so that active sites on the surface of the carrier activated biochar can be ensured to the greatest extent, and the active site blockage caused by the coating effect is avoided; a good removal effect on cadmium ions, lead ions and chromium ions is achieved; according to the amorphous porous calcium carbonate coating layer, polyacrylic acid serves as a stabilizer and can be complexed with calcium ions of amorphous porous calcium carbonate, so that the amorphous porous calcium carbonate is stabilized, and rapid nucleation and crystallization in a water environment are avoided.

The application discloses an environment-friendly rubber auxiliary agent NS preparation process and belongs to the technical field of coal. The self-synthesized calcium sulfide / hollow spur-shaped manganese dioxide nanometer balls and interpenetrating polymer polymers are added, the hollow structure of the calcium sulfide / hollow spur-shaped manganese dioxide nanometer balls is provided with a larger specific surface area and porosity, can be used as stress dispersion points in a rubber system, can relieve stress concentration of rubber in a stretching and compression process, can improve tear strength and fatigue resistance of rubber products, the surface spur-shaped morphology can enhance the interface bonding force between the nanometer particles and the rubber matrix, can reduce filler aggregation, can ensure uniform dispersion of the auxiliary agent in the rubber, and further stabilize the mechanical properties of the rubber. The calcium sulfide / hollow spur-shaped manganese dioxide nanometer balls and the interpenetrating polymer polymers interact with each other, and the hollow spur-shaped structure can be embedded into the interpenetrating polymer polymers to play a bridging role.

This invention belongs to the field of solid waste resource utilization technology, specifically relating to a method for preparing highly active calcium oxide through low-temperature decomposition of phosphogypsum based on composite additives. The method involves uniformly mixing phosphogypsum with composite additives, followed by heating and decomposition under a non-strong reducing atmosphere to obtain a solid product containing calcium oxide. Subsequently, byproducts are selectively separated to remove the remaining product, yielding highly active calcium oxide. Compared with existing technologies, this invention eliminates the need for carbonaceous reducing agents and strong reducing gases, avoiding the formation of calcium sulfide intermediates. The synergistic effect of the composite additives enables the direct decomposition of phosphogypsum at lower temperatures, improving the reactivity and specific surface area of ​​calcium oxide, while simplifying the process and reducing energy consumption.

The application belongs to the technical field of biological materials, and discloses a piezocatalytic biological heterojunction PEEK bone implant material and a preparation method. The material comprises a PEEK bone implant loaded with a biological heterojunction. The biological heterojunction is composed of BiVO4 and a chalcogenide calcium compound in a molar ratio of 1-3. The chalcogenide calcium compound is calcium sulfide, calcium selenide or calcium telluride. In the preparation, the BiVO4 / CaX biological heterojunction is prepared by a hydrothermal method or an in-situ composite method. Then, the PEEK is sequentially cleaned by acetone, ethanol and deionized water, and is subjected to ultrasonic treatment in sulfuric acid for 5-10 minutes. After being modified by dopamine, the biological heterojunction is contacted with the modified PEEK at 4 DEG C for 12 hours to complete the loading. In some schemes, an improved means can be introduced. The material has the functions of sound catalytic antibiosis and bone repair promotion. The antibiosis effect can be controlled by ultrasound. The process is simple, and the reaction conditions are mild. The material can also cope with multiple drug-resistant bacterial infections, and can improve the stability of the heterojunction loading and the cell compatibility of the material.

The subject of the application is an oil for hot heat treatment of steel, which contains 80.5% - 92.0% (m / m) of base oil containing I) 20.0% - 60.0% (m / m) of wax - modified lanolin having a kinematic viscosity at 40°C of 485.0 - 598.0 mm2 / s and a pour point of 2°C - 16°C and characterized by a distillation range such that less than 5% V / V distils to 458°C and at least 95% V / V distils to 645°C, II) 20.0% - 45.0% (m / m) of mineral oil having a kinematic viscosity at 40°C of 28.0 - 39.0 mm2 / s and a pour point of -8°C to -18°C and which is characterized by a distillation range such that less than 5% V / V distills to 315°C and at least 95% V / V distills to 470°C, III) 5.0 - 40.0 (m / m) of Brightstock base oil, having a kinematic viscosity at 40°C of 470.0 - 560.0 mm2 / s and a pour point of -5°C to -12°C, and which is characterized by a distillation range such that,that less than 5% V / V distils up to 440°C and at least 95% V / V distils up to 675°C and contains two packages of improvers in the amount of: a) 1.5% - 6.0% (m / m) of a package of improvers containing, calculated on the total weight of this package, 5% - 9.9% (m / m) bis(nonylphenyl)amine and 5% - 9.9% (m / m) sulphurised calcium salts and alkyl derivatives of phenols, mainly dodecylphenol and 0.5% - 0.99% (m / m) tetrapropenylphenol isomers dissolved in mineral base oil, the content of which in the package is from 30% to 60% (m / m), b) 1.5% - 8% (m / m) of a package of improvers containing, in calculated on the total weight of this package, a mixture of 70% (m / m) hydrocarbon resins with 30% (m / m) non-aromatic hydrocarbons obtained from the vacuum residue after distillation of crude oil or by separating the raffinate - oil in the process of deasphalting the vacuum residue, and additionally contains 2 refining additives with different functions, in amounts of c) 0.2% - 4,0% (m / m) of ashless dispersant, type mono- and / or bis-polybutenesuccinimides, with a base number of not more than 18 mg KOH / g and a viscosity at 100°C of not more than 330 mm2 / s, d) 0.2% - 3.0% (m / m) of viscosity modifier - polymer of esters of acrylic acid and methacrylic acid with aliphatic alcohols (C1-C18), dissolved in mineral base oil and with a viscosity of the entire mixture at 100°C in the range from 660 mm2 / s to 980 mm2 / s,

A method of producing calcium oxide from a raw material (3) comprising a source of calcium sulfate, comprising - a first step of reducing a first portion of the calcium sulfate in the presence of a reducing agent (6) in a reduction reactor (1) to obtain calcium sulfide, wherein the reducing agent comprises ammonia, and subsequently - a second step of reacting the calcium sulfide and a second portion of the calcium sulfate with each other to obtain calcium oxide and sulfur dioxide.

A method of producing calcium oxide from a raw material comprising a source of calcium sulfate, comprising - a first step of reducing a first portion of the calcium sulfate in the presence of a reducing agent in a reduction reactor to obtain calcium sulfide, and - a second step of converting calcium sulfide into calcium oxide by using a second portion of the calcium sulfate, and further comprising subj ecting a carbonaceous material to a thermochemical conversion process in a thermochemical conversion reactor for converting the carbonaceous material into a syngas and / or a solid product and using the syngas and / or the solid product as the reducing agent.

The present application discloses a kind of coating of electrode, electrode and its preparation method and application, coating includes by weight parts: 8.0-14.0 rutile, 6.0-8.0 marble, 1.5-3.5 fluoride, 1.5-3.0 mica, 5.0-9.0 potassium feldspar, 0.8-1.6 electrolytic manganese, 0.4-1.0 ferro titanium, 2.0-4.0 metal chromium, 1.0-3.0 metal nickel, 0.1-0.6 iron sand, 0.1-0.4 calcium sulfide and 0.4-0.6 soda ash;Coating and welding core constitute electrode, electrode is applied to austenite-ferrite dissimilar steel surfacing, and the plasticity and toughness of deposited metal after surfacing forming are good, and corrosion resistance is excellent, satisfy the surfacing requirement of petroleum, chemical, hydraulic and nuclear power equipment.

The application provides a resource utilization system and method and application of industrial phosphogypsum and organic waste salt, and the resource utilization method comprises the following steps: mixing, granulating, calcining, water immersion treating and post-treating: industrial phosphogypsum, organic waste salt and a reducing agent are mixed and granulated to obtain a mixture; the mixture is subjected to calcining treatment to obtain a calcined product and a calcined tail gas; the calcined product is subjected to water immersion treatment to obtain a precipitate and a salt-containing solution, and then the precipitate and the salt-containing solution are respectively subjected to post-treatment to obtain a recovery product. The organic waste salt has the characteristics of molten salt at high temperature, the decomposition temperature of the phosphogypsum is reduced, the decomposition efficiency of the phosphogypsum is improved, the conversion rate of the phosphogypsum to calcium sulfide reaches more than 98%, and the organic matter in the organic waste salt is removed, and the removal rate of the organic matter reaches more than 99.5%. The method not only realizes the collaborative disposal and resource utilization of the industrial phosphogypsum and the organic waste salt, but also is environmentally friendly, safe and efficient, and is a green and clean resource utilization process.