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

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 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 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.