49results about How to "High mass percentage" patented technology

A single organic substance layer protected conglomerated gold foam material with high content of gold, high uniformity and broad-spectrum applications, its two chemical formulas, and associated two preparing process are disclosed.

The invention relates to the technical field of synthesizing of graphene materials and provides a preparation method of nitrogen-doped graphene. The preparation method includes: using an improved Hummers method to prepare continuous large-piece graphene oxide; using a hydrothermal method to prepare the graphene oxide into graphene of a porous three-dimensional structure; ultrasonically dispersing the graphene of the porous three-dimensional structure into an acid solution with the pH being 1-5, adding aniline, well mixing, adding ammonium persulfate, well mixing, and transferring the obtained mixed liquid into a teflon container for hydrothermal reaction so as to obtain a porous three-dimensional graphene-polyaniline compound; performing high-temperature treatment under nitrogen protection to allow polyaniline to decompose out nitrogen sources so as to obtain the nitrogen-doped porous three-dimensional graphene. The method has the advantages that the nitrogen-doped graphene with high nitrogen content can be prepared, the structure of the three-dimensional graphene can be kept, the obtained nitrogen-doped porous three-dimensional graphene is good in electrochemical performance and quite suitable for being used for producing a super capacitor, and the method is convenient to operate and beneficial to industrial popularization.

The invention relates to a preparation method of amino acid chelated calcium. The preparation method comprises the following steps: preparing a mixture by mixing a calcium-containing compound and an amino acid ligand according to a specific ratio, adding a right amount of water into the mixture, performing primary filtration on the material to obtain a first suspension having a solid particle size less than 20 mu m, regulating the pH value, performing homogenization treatment to enable the solid particle size to reach the nano level, performing secondary filtration after the homogenization treatment filtration a second suspension having a solid particle size less than 100 nm, and finally performing chelation reaction on the second suspension at specific temperature and pressure. Thus, the chelation rate and the reaction efficiency of the chelation reaction are greatly improved, the reaction time is short, and the reaction is complete. The amino acid chelated calcium is high in yield; the mass percent of the calcium element in the amino acid chelated calcium is up to 12.9%; and the amino acid chelated calcium prepared by the method can be absorbed by a human body very easily, and the absorptivity is up to 95% or above.

The invention discloses an inorganic bonding system for water-based environment-friendly brazing flux, which comprises the following components in terms of mass percentage: Na 2 O 15%~20%, SiO 2 48%~65%, component A 0.1%~1%, Fe 2 o 3 0-0.1%, moisture 12%-36%; the component A includes CaO and MgO, and the mass ratio of CaO and MgO is 1:0.5-2. The invention also discloses the application of the inorganic bonding system for the water-based environment-friendly brazing flux in the preparation of coated brazing filler metal. The invention also discloses a coating composition for brazing material, which includes brazing flux and the inorganic bonding system for the water-based environment-friendly brazing flux. The invention also discloses a sheathed brazing material, which comprises a brazing material as an inner core and a sheath covering the brazing material, spraying the brazing material coating composition onto the surface of the brazing material and drying That is, the covered brazing filler metal is obtained.

A single organic substance layer protected conglomerated gold foam material with high content of gold, high uniformity and broad-spectrum applications, its two chemical formulas, and associated two preparing process are disclosed.

The invention relates to a method for raising ore grade and reducing SiO2 content of a pre-concentrated iron ore concentrate made from a fly ash. The method comprises the following steps of obtaining the pre-concentrated iron ore concentrate from the fly ash produced in a thermal power plant through dry type pre-concentration; according to the characteristics of the pre-concentrated iron ore concentrate being high in fine fraction iron grade, high in iron distribution ratio and low in silicon content, classifying the pre-concentrated iron ore concentrate made from the fly ash into a coarse fraction and a fine fraction utilizing a high-fineness classifying cyclone or an electromagnetic vibrating undersize sieve, wherein the classification granularity is 200-400 meshes; rejecting coarse-fraction pre-concentrated iron ore concentrate with low iron grade and high silicon content; performing flux weakening concentration on the fine-fraction pre-concentrated iron ore concentrate through a two-stage magnetic separation technology, wherein the magnetic field intensity of the first-stage magnetic separation is 150-180mT, and the magnetic field intensity of the second-stage magnetic separation is 100-120mT; and finally obtaining the qualified iron ore concentrate of which the iron grade is 55% or below and the SiO2 content is lower than 8%, filtering the iron ore concentrate after the magnetic separation, and conveying the filtered iron ore concentrated into a concentrate warehouse. According to the method disclosed by the invention, the problems that the pre-concentrated iron ore concentrate made from the fly ash is low in grade, and high in silicon content are solved.