4 results about "Sodium metavanadate" patented technology

This invention relates to the field of galvanized steel technology, and proposes a scratch-resistant galvanized steel strip and its preparation method. The scratch-resistant galvanized steel strip comprises, from bottom to top, a steel strip, a hot-dip galvanized layer, and a passivation layer. During the preparation of the passivation layer, each 1L of passivation solution includes the following components: 5-10g sodium molybdate, 1-2g sodium nitrate, 0.1-0.3g sodium metavanadate, 0.5-0.8g titanylfluoride, and 0.2-0.5g bis(1,6-hexanetriamine)pentamethylenephosphonic acid. This technical solution solves the problems of poor scratch resistance and low surface hardness of existing galvanized steel strips.

This application discloses a method for producing acetonitrile by reacting acetate with ammonia, comprising the following steps: in a reactor, acetate, ammonia, and a catalyst are contacted and reacted to obtain acetonitrile; the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; the catalyst is composed of a support and vanadate and alkali metal oxide of active components supported on the surface of the support; the vanadate is selected from at least one of bismuth vanadate, silver metavanadate, ammonium metavanadate, lithium vanadate, lithium metavanadate, sodium vanadate, sodium metavanadate, potassium vanadate, and potassium metavanadate; the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide; the support is selected from at least one of silicon oxide, alumina, and molecular sieve; the mass content of vanadate is 0.1–10 wt%, and the mass content of alkali metal oxide is 0.01–5 wt%.

This invention discloses a water-based fast-drying anti-rust paint and its preparation process and method. The paint comprises a core-shell acrylic emulsion, an acrylic phosphate emulsion, a nano-composite zinc phosphomolybdate, nano-graphene, a phytic acid-modified silicon quantum dot composite, sodium metavanadate, and additives. It has excellent long-lasting anti-corrosion, fast-drying application, and environmental friendliness, and is particularly suitable for rust prevention and protection of steel substrates in high-chlorine corrosion environments such as marine environments.

This invention provides a method for the resource-based regeneration of waste tungsten based on low-temperature catalytic leaching, belonging to the technical field of waste tungsten resource recycling. The method includes: collecting tungsten waste, pre-treating it to obtain tungsten particles; adding a leaching agent and catalyst to the tungsten particles for low-temperature catalytic leaching, collecting the tungsten leachate after solid-liquid separation; adding oxalic acid to adjust the pH to 2.5-4.0, allowing it to stand to remove silicon and phosphorus, then adding sodium sulfide solution to remove heavy metals, obtaining a pure tungsten solution after solid-liquid separation; preparing ammonium paratungstate or tungsten trioxide from the pure tungsten solution; and performing staged reduction heat treatment to obtain regenerated tungsten powder. The leaching agent is a mixture of sodium hydroxide and hydrogen peroxide; the catalyst is a mixture of sodium metavanadate and sodium carbonate. This invention covers the entire process of tungsten waste recycling, pre-treatment, leaching, purification, product preparation, and waste recycling, with each link working synergistically to form a closed-loop industrial chain, maximizing the utilization of waste tungsten resources and avoiding resource waste.