33 results about "CALCIUM CARBONATE/MAGNESIUM CARBONATE" patented technology

The invention belongs to the field of energy. Biomass is used as a raw material, and is added with catalyst calcium carbonate / magnesium carbonate of a carbonate system to react in a fluidized bed; a biomass gasification process is divided into two processes, namely a biomass burning process and a biomass pyrolysis and gasification process, and the two processes work alternately in turn, wherein the burning process comprises that catalyst calcium carbonate / magnesium carbonate granules are added into the fluidized bed, simultaneously air is supplied to the fluidized bed, the air supply to the furnace is stopped when the temperature of the bed layer is raised to a predetermined temperature, and the burning process is finished; then the biomass burning process turns to the gasification process, namely vapor and biomass are supplied to the fluidized bed to obtain hydrogen-rich gas with extremely low tar content; and after the hydrogen-rich gas is washed and purified by coal gas, the hydrogen-rich gas is converted into H2 and CO2 in a CO conversion device, then the gas is desulfurized and compressed, and the H2 is extracted from the gas in a variable pressure adsorption device. The method achieves that the gasification and burning two processes and the cyclic regeneration of a catalyst are finished in the same fluidized bed gasification furnace, the investment is saved, and the running cost is low.

The invention discloses low-cost environmentally-friendly interior wall paint which comprises the following components by weight percent: 30-40% of straw powder, 10-15% of calcium carbonate, 10-15% of magnesium carbonate, 10-15% of bentonite, 2-3% of hydroxyethylcellulose, 3-5% of white latex and the balance of water. Because used raw materials are wide in sources and low in cost, and particularly regenerative straw powder has large proportion, the cost of the paint can be greatly reduced, and the paint is environmentally-friendly.

The invention discloses a smoke gas catalyst capable of simultaneously realizing desulfurization and denitrification, which aims to provide a desulfurizing and denitrifying agent for CTR-ultraviolet radiation smoke gas capable of reducing the investment and operation costs of the device and simultaneously efficiently removing the NO, NO2 and SO2 in the smoke gas. The moke gas desulfurizing and denitrifying catalyst provided by the invention may comprise the following components according to fractional ratio: 40-100% of calcium-based imvite, 0-40% of calcium oxide, 0-20% of iron oxide, 0-30% of carbonate and 0-10% of titanium dioxide, wherein the iron oxide is one or more types of ferrous oxide, iron sesquioxide and ferroferric oxide, and the carbonate is one or more types of calcium carbonate and magnesium carbonate. The desulfurizing and denitrifying agent for CTR-ultraviolet radiation smoke gas is not only suitable for the flue gas desulfurization of a new boiler but also particularly suitable for the improvement in order to construct a combustion device.

The invention relates to an out-of-furnace refining method for micro-alloy steel and special steel, in particular to a compound sphere used for out-of-furnace refining desulfurization and removal of fine inclusions and its preparation method, which is a refining desulfurization method for various micro-alloy steels or special steels. , The first choice for removing small inclusions. It is composed of a core and a shell. The core is mainly composed of low melting point pre-slag powder, calcium carbonate, magnesium carbonate or a mixture of calcium carbonate and magnesium carbonate. The shell is mainly composed of calcium oxide or magnesium oxide. Composition of one or a mixture of two. The invention has a scientific formula and a simple and reasonable process, can effectively remove inclusions in molten steel, and at the same time, it has been proved by application that it can realize rapid refining and desulfurization of molten steel until the sulfur content is lower than 0.0030%, and has high efficiency, stability and short time. It can meet the requirements of different molten steels for sulfur content. The quality of refined steel is greatly improved and the cost of smelting is reduced.

The invention relates to a Fe-Al2O3 metal ceramic sealing ring with excellent wear resistance and toughness and uniform microscopic structures, and a preparation method thereof. The Fe-Al2O3 metal ceramic sealing ring is composed of, by weight, 40 to 60% of alumina, 2 to 4% of iron oxide, 1 to 3% of zirconia, 3 to 5% of cerium oxide, 0.1 to 1% of LaNbO4, 1 to 2% of an aluminate, 0.1 to 1% of calcium carbonate, 0.2 to 0.8% of magnesium carbonate, 0.02 to 0.5% of a wax emulsion, 0.3 to 1.2% of ammonium polymethacrylate, 0.5 to 3% of a binder, 0.2 to 1% of a dispersant, and the balance clay and inevitable impurities. The composition of the Fe-Al2O3 metal ceramic sealing ring is reasonable; and the Fe-Al2O3 metal ceramic sealing ring with excellent performance is prepared through strict preparation technology.

The invention belongs to the field of welding materials, in particular to a stainless steel welding rod resistant to redness and cracking of the drug skin, comprising a stainless steel welding core with a longitudinal V-shaped groove on the outer peripheral surface, a copper plating layer and a drug layer, and the dry powder component in the drug layer For: Rutile 10%‑12%, Mica 8%‑10%, Calcium Carbonate 8%‑10%, Magnesium Carbonate 8%‑10%, Nickel Carbonate 5%‑7%, White Clay 3%‑5%, Zirconia 2%‑4%, 8%‑10% fluorite, 1%‑3% spodumene, 4%‑6% ferromanganese, 2%‑4% ferrotitanium, 5%‑7% ferrosilicon, sodium alginate 0.2%-0.3%, carboxymethyl cellulose 0.15%-0.25%, nano-cerium oxide and / or nano-yttrium oxide and / or nano-lanthanum oxide 1.5%-2%, and the rest is feldspar. The welding core of the invention has small volume expansion after being heated, high strength of the coating, high welding arc voltage, joint transition of molten droplet in the form of slag wall and jet, and strong resistance to redness and cracking of the coating.

The invention discloses a flux-cored wire for underwater welding and a preparation method. The flux-cored wire is composed of outer skin and a flux core. The flux-cored wire is characterized in that the outer skin is made from low-carbon steel, the flux core is prepared from oxide, carbonate, fluoride and metal powder, the oxide is the mixture of calcium oxide, magnesium oxide, titanium oxide, iron oxide and silicon oxide, the fluoride is the mixture of calcium fluoride, lithium fluoride and barium fluoride, the carbonate is the mixture of calcium carbonate, magnesium carbonate and barium carbonate, and the metal powder is the mixture of silicon, aluminum, titanium, magnesium, nickel, iron, manganese and boron. The flux-cored wire enables underground wet welding to have the advantages thatelectric arc is stable, less splash is produced, molten slag stripping performance is excellent, welding seam forming performance is good, and welding seam structure performance is excellent.

The invention relates to a composite gas generating agent with a mesa combustion effect and a preparation method thereof. The gas generating agent can generate or obtain a gas product suitable for being used as a pushing source during the combustion, and is suitable for being applied to the field of a fire extinguishing device. The composite gas generating agent is prepared from the ingredients of5-amino-1h-tetrazol, nitroguanidine, aminotetrazolidine salt, copper oxide, zinc oxide, oxidizing agents, cooling agents and bonding agents, wherein the oxidizing agents include strontium nitrate andpotassium nitrate; the cooling agents include calcium carbonate and magnesium carbonate. The method is characterized in that the 5-amino-1h-tetrazol, the nitroguanidine, the aminotetrazolidine salt,the copper oxide, the zinc oxide, the oxidizing agents and the cooling agents are uniformly mixed; then, ethyl alcohol is added for dissolution; the mixture is charged into a planetary ball milling instrument; full grinding is performed for 12h; after the drying crushing, the mixture passes through a 100-mesh sieve; uniformly mixed powder is obtained; the corresponding proportion of bonding agentsare added into the power; the mixture is uniformly mixed and is then charged into a mold; an automatic punching machine is used for completing the tableting at the specified pressure; the gas generating agent is obtained.