8 results about "Chromic sulfate" patented technology

The invention discloses an additive for enhancing corrosion resistance of trivalent chromium oxidation liquid and a preparation method of the additive, and belongs to the technical field of chemical oxidation treatment.The additive is prepared from chromium sulfate, rare earth salt, a complexing agent, a corrosion inhibitor, gamma-mercaptopropyltriethoxysilane, tetraethoxysilane and water. Two kinds of silane which is insoluble or slightly soluble in water are compounded into an additive for enhancing the corrosion resistance, the additive is added into a trivalent chromium aqueous solution, and after corresponding process treatment, the corrosion resistance of trivalent chromium chemical oxidation treatment can be improved from less than 96 h to more than 336 h. The additive prepared by the invention can effectively improve the pitting corrosion resistance of the trivalent chromium oxide film, and the neutral salt mist resistance of the trivalent chromium oxide film is greatly improved.

The invention relates to the technical field of well cementation engineering, in particular to a multi-element micromolecule compounded high-temperature-resistant oil well cement retarder and application thereof. The multi-element micromolecule compounded high-temperature-resistant oil well cement retarder is prepared from the following raw materials in parts by weight: 20 to 30 parts of disodium 1-hydroxyethylidene-1, 1-diphosphonate, 5 to 10 parts of sodium tetraborate, 5 to 10 parts of sodium gluconate, 2 to 5 parts of chromium sulfate and 65 to 130 parts of water. The invention can effectively solve the problem of performance failure of the traditional oil well cement retarder caused by a large temperature difference environment with a bottom hole circulation temperature of more than 220 DEG C and more than 90 DEG C.

The application provides a trivalent chromium passivation solution for maintaining the original color of aluminum alloy, which is prepared from basic chromium sulfate, zirconium salt, fluoride salt, corrosion inhibitor, organic acid complexing agent and water. The application also provides a preparation method of the trivalent chromium passivation solution for maintaining the original color of aluminum alloy, which comprises the following steps: heating water to 75-85 DEG C, then adding basic chromium sulfate, stirring while adding until completely dissolved, then adding zirconium salt, fluoride salt, corrosion inhibitor, organic acid complexing agent, silane coupling agent, water-soluble resin and nano silicon dioxide in sequence, and stirring for 1-2 h; using a pH regulator to adjust the pH value to 3.8-4.2, and the trivalent chromium passivation solution for maintaining the original color of aluminum alloy is obtained. The application also provides a passivation method for maintaining the original color of aluminum alloy. The application has the advantages of saving raw material cost, simple preparation method, and the like, and the passivated aluminum alloy part has a dense and uniform passivation film, the appearance color is maintained as the original color, the corrosion resistance exceeds 300 hours after neutral salt spray test, and the corrosion resistance is good.

The invention discloses a high-temperature type trivalent chromium plating solution for high-speed chromium plating, which comprises the following active ingredients: 30-120 g / L of trivalent chromium main salt; the trivalent chromium main salt comprises at least one of basic chromium sulfate, chromium sulfate and chromium potassium sulfate; the content of the complexing agent is 90 to 150g / L; the complexing agent comprises at least two of formate, glycine, citric acid, citrate and urea; the content of the conducting salt is 100 to 200g / L; the content of the buffering agent is 30 to 50g / L; the content of the brightening agent is 1.5 to 3g / L; the content of the surfactant is 0.4 to 0.9 g / L; the content of the stabilizer is 4-8 g / L; the pH value of the trivalent chromium plating solution ranges from 1.5 to 4.5. According to the trivalent chromium plating solution, the deposition rate of the sulfate system trivalent chromium plating solution can be effectively increased, and a uniformly-distributed plating layer can be obtained within a short time.

The invention discloses a trivalent chromium plating solution for medium-temperature type high-speed chromium plating, which comprises the following active ingredients: 30-120 g / L of trivalent chromium main salt; the trivalent chromium main salt comprises at least one of basic chromium sulfate, chromium sulfate and chromium potassium sulfate; the content of the complexing agent is 70 to 135 g / L; the complexing agent comprises at least two of acetate, tartaric acid, oxalic acid, oxalate and malic acid; the content of the conducting salt is 80 to 150g / L; the content of the buffering agent is 20 to 40g / L; the content of the brightening agent is 0.1 to 1.2 g / L; the content of the surfactant is 0.01 to 0.25 g / L; the content of the stabilizer is 1-3g / L; and the pH value of the trivalent chromium plating solution is 3-6. The invention further discloses a preparation method and an electroplating method of the trivalent chromium plating solution.

The invention belongs to the technical field of extraction of vanadium oxide from vanadium slag, and relates to a method and a system for removing impurity silicon in sodium vanadium solution. The method comprises the following steps: S100, adjusting the pH value of the sodium vanadium solution, and maintaining the pH value of a solution system at 8.0-10.0 to obtain a pretreated sodium vanadium solution; s200, heating the pretreated sodium vanadium solution, and sequentially adding aluminum sulfate and chromium sulfate for deep removal reaction of Si to obtain reaction slurry; and S300, the reaction slurry is subjected to standing sedimentation and solid-liquid separation in sequence, and purified vanadium liquid is obtained. According to the method disclosed by the invention, low-dosage aluminum sulfate which is lower than the theoretical dosage of Al < 3 + > salt for silicon removal can be added into a sodium vanadium solution system, so that Si in the solution is precipitated and removed in the double hydrolysis reaction of Al < 3 + > and SiO3 < 2->, and Al is not brought into the solution.

The application discloses a kind of stabilizing treatment liquid, for 690MPa grade weathering bridge steel component each component mass percentage content: the content of ferric chloride is 3~7%; The content of sodium bisulfite is 1~2%; The content of chromium sulfate is 3~6%; The content of potassium permanganate is 1~4%; The content of polypropylene glycol is 1~2%; The content of sodium carboxymethyl cellulose is 2~5%; The rest is deionized water.This application also provides the treatment process of stabilizing treatment liquid and its application.The application can realize the rust layer stabilization treatment of 690MPa grade weathering bridge steel component, and the surface of 690MPa grade weathering bridge steel component after treatment forms the brown rust layer of uniform color, no rust liquid flow.

The utility model belongs to the technical field of chromic sulfate production equipment, especially relates to a feeding device for base type chromic sulfate production, including feeding device body, the feeding device body includes feeding mechanism, one side of feeding mechanism is provided with the mechanism of containing material, the output of auger conveyor is provided with the isolation subassembly, the below of isolation subassembly is provided with the material storage subassembly, the below of material storage subassembly is provided with the material discharge subassembly that gathers and divides the function in one, the mechanism of containing material includes the frame, the inside of frame is provided with the casing of U shape design, be provided with stirring subassembly in the casing, the utility model discloses reasonable in design, simple structure, processing is convenient and can realize the acceptance of production material on one hand, guarantees the smooth development of conveying work, can realize the quantitative export of conveying material on the other hand, prevents the material from piling up, ensures its subsequent dispersion effect, guarantees the smooth development of processing work, improves work progress, satisfies the use demand.