4results about How to "Change wettability" patented technology

This invention provides a method for preparing a high-salinity zinc oxide-resistant nanofluid mediated by Halomonas sp. and its application in enhancing oil recovery. Specifically, it includes: a Halomonas sp. strain CDH-2, with accession number CCTCC NO: M 2025786, which can rapidly grow in high-concentration salt solutions and produce salt-resistant extracellular metabolites. Fermenting and culturing CDH-2 under high-salt conditions yields a fermentation broth with a surface tension below 30 mN / m. Mixing and culturing the obtained fermentation broth with a metal precursor solution yields a high-salinity-resistant metal nanofluid. The resulting metal nanofluid maintains good stable dispersibility in high-salinity water and effectively reduces oil-water interfacial tension. It alters the wettability of oil-wetting surfaces, emulsifies and disperses crude oil, and reduces crude oil viscosity. Therefore, it can be used as an enhanced oil recovery agent in high-salt reservoirs and is widely applied in oilfield flooding, well huff and puff, and heavy oil viscosity reduction.

The invention relates to the technical field of mineral processing, and provides a method for extracting fine iron powder from raw iron ore, which comprises the following steps: crushing and screening the raw iron ore to obtain crude raw iron ore; performing first-stage grinding, first-stage magnetic separation, second-stage grinding, second-stage magnetic separation, third-stage magnetic separation, flotation extraction and drying on the crude iron ore to obtain fine iron powder; a collecting agent is added during flotation extraction, and the collecting agent is prepared from the following components in parts by weight: 42 to 45.5 parts of sodium oleate, 18 to 19.5 parts of sodium stearate, 8 to 11.5 parts of benzohydroxamic acid, 5 to 7.5 parts of nonylcyclohexanol polyoxyethylene ether, 5 to 7 parts of castor oil polyoxyethylene ether, 5 to 7.5 parts of polypropylene glycol and 2 to 4.5 parts of sodium citrate. By means of the technical scheme, the problem that in the prior art, the iron recovery rate of fine iron powder extracted from raw iron ore is insufficient is solved.

The application discloses a production and preparation process of a heavy-duty water-based epoxy primer suitable for a high-salt and high-humidity environment, and relates to the technical field of water-based epoxy primer production. The raw materials are as follows: 30-50 parts of bisphenol A type water-based epoxy resin emulsion, 10-20 parts of a curing agent T-31, 3.5-5 parts of a reinforced anti-settling agent, 8-12 parts of zinc phosphate, 5-8 parts of aluminum tripolyphosphate, 10-15 parts of precipitated barium sulfate, 3-6 parts of silicon powder, 0.8-1.2 parts of a polyacrylic acid sodium salt dispersing agent, 0.4-0.8 parts of an organic silicon defoaming agent, 0.3-0.7 parts of an acrylic ester leveling agent and 0.6-1 part of a polyurethane thickening agent. The bentonite in the reinforced anti-settling agent and the modified phosphosilicate zirconium powder can improve the microstructure of the primer system, the coating is more compact, the primer can be conveniently applied to a high-salt and high-humidity environment, and the salt mist resistance of the water-based epoxy primer is enhanced.

The utility model discloses a plate heat exchanger with a turbulent flow structure, which belongs to the field of plate heat exchangers and comprises a heat exchanger body, the outer end of the heat exchanger body is movably connected with a positioning mechanism, the inner end of the positioning mechanism is provided with a turbulent flow mechanism, and the positioning mechanism comprises a reinforcing rod. The reinforcing rods are evenly distributed at the inner end of the heat exchanger body, the outer ends of the reinforcing rods are each sleeved with a plurality of limiting blocks, the outer ends of the limiting blocks are each movably connected with a reinforcing ring, and each reinforcing ring is of a semicircular structure; the limiting blocks and the reinforcing rods can be reinforced and supported by arranging the reinforcing rings, during disassembly and maintenance, the multiple positioning rods are pulled to drive the clamping blocks to relieve positioning with the reinforcing rods, the multiple limiting blocks and the reinforcing rods can be conveniently separated, the internal turbulent flow structure of the plate heat exchanger is more convenient to maintain, and the maintenance efficiency is improved. And the practicability of the plate heat exchanger with the turbulent flow structure is improved.