38results about How to "Avoid recycling difficulties" patented technology

The invention discloses a method for extracting lithium in spodumene, an adsorption material for the extraction and a preparation method thereof, and belongs to the technical field of lithium resource extraction. The adsorption material of the present invention is loaded on SiO 2 The 4-amino-dibenzo-14-crown 4-crown derivative on the surface, the extraction method of lithium in a kind of spodumene of the present invention, adopts the sulfuric acid method to extract, and the spodumene is transformed through roasting-sulfating roasting- Lithium sulfate solution is obtained by leaching, and then the above-mentioned adsorption material is used for adsorption treatment of the obtained lithium sulfate solution. Finally, the adsorption material is washed and desorbed, and then pure sodium carbonate solution is added and heated to precipitate lithium. Lithium carbonate product is obtained after washing and drying. . The adsorption material of the present invention has a strong selective adsorption capacity for lithium, can be effectively used for the extraction of lithium in the sulfuric acid spodumene, has high extraction efficiency, realizes a high concentration of lithium ions, and overcomes the existing The deficiencies in the sulfuric acid extraction process.

The invention relates to the field of materials, in particular to a copper ferrite / carbon nanofiber membrane and a preparation method and application thereof. The preparation method of the copper ferrite / carbon nanofiber membrane comprises the steps of adding copper salt and ferric salt into mixture of polymer and N,N-dimethyl formamide and mixing to obtain electrostatic spinning solution; performing electrostatic spinning on the electrostatic spinning solution to obtain a metal salt / polymer fiber membrane, performing thermal treatment on the metal salt / polymer fiber membrane and annealing to obtain the copper ferric / carbon nanofiber membrane. The polymer is polyacrylonitrile or polyvinyl pyrrolidone, and molar ratio of copper salt to ferric salt is (1.8 to 2.2):1. The copper ferrite / carbon nanofiber membrane can fix metal in electro-fenton catalyst in the fiber membrane, avoids secondary pollution and avoids the problems that catalyst is lost and difficult to recycle in a traditional out-phase electro-fenton process. Furthermore, the preparation method is convenient to implement, has lower cost and has certain economical and social benefits.

The invention discloses a preparation method of a Fe2O3-MoS2-CdS visible photocatalysis film. The method comprises the following steps of (1) using a Fe<2+> precursor solution as an electrolyte; performing electrodeposition on a conducting substrate; then, performing roasting treatment to obtain a Fe2O3 film; (2) soaking the Fe2O3 film into a MoS2 precursor solution; preparing a Fe2O3-MoS2 film by a hydro-thermal method; (3) putting the Fe2O3-MoS2 film into the Cd<2+> precursor solution; performing heating reaction to obtain the Fe2O3-MoS2-CdS visible photocatalysis film. The invention also provides the Fe2O3-MoS2-CdS visible photocatalysis film prepared by the method, and application of the film to treatment of phenol-containing wastewater. The preparation process is simple; the repeatability is high; in addition, the economic cost is lower. Through the combination of three photocatalysts with different energy belt structures, the synergic effect is achieved; the photocatalyst performance is greatly improved.

The invention discloses a novel catalytic material and its preparation method and application. The preparation method comprises the following steps: (1) placing a conductive substrate in a mixed solution of cobalt salt, nickel salt, ammonium fluoride and urea for solvothermal reaction, A precursor electrode containing Co and Ni elements is obtained; (2) imidazole is calcined under an inert atmosphere to obtain imidazole vapor, and the precursor electrode is placed in imidazole vapor to obtain a CoNi-MOFs electrode; (3) sulfur-doped nitrogen Carbonized carbon powder is dispersed in water to form a suspension, the CoNi-MOFs electrode is soaked in the suspension, and processed by high-energy treatment technology to obtain the new catalytic material. The novel catalytic material of the present invention has excellent hydrogen evolution and oxygen evolution performance, is a dual-functional catalytic material with excellent performance, and can be widely used in many electrocatalytic fields including pollutant degradation and electrocatalytic cracking of water for hydrogen and oxygen production.

The present invention is applicable to the field of material technology, and provides a PEF heat-shrinkable film, including an outer film layer, an intermediate film layer, and an inner film layer; wherein, the outer film layer and the inner film layer are made of the following raw materials in parts by weight Ingredients: 40-55 parts of high-pressure low-density polyethylene, 15-25 parts of high-density polyethylene, 10-15 parts of ethylene-vinyl acetate copolymer, 5-10 parts of polyurethane acrylate, 5-10 parts of modified clay, oleic acid 4-6 parts of amide and 2-5 parts of antioxidant; the intermediate film layer is made of the following raw materials in parts by weight: 25-35 parts of high-pressure low-density polyethylene, 20-30 parts of high-density polyethylene, ethylene- 10-15 parts of vinyl acetate copolymer, 2-6 parts of modified silicon dioxide, 4-6 parts of oleic acid amide, and 1-3 parts of antioxidant; the present invention uses non-toxic and widely sourced raw materials to compound PEF Heat shrinkable film is not only stable in appearance, but also has good physical and mechanical properties such as heat shrinkage rate, tensile properties, and tear strength. It is suitable for packaging and transportation of items including but not limited to food, electronic products, etc., and has good development prospects.

The invention relates to the technical field of functional materials, and in particular to a composite membrane for removing metal ions in wastewater and preparation and application of the composite membrane. The composite membrane comprises polyaniline, pyrrole and a functional high polymer material; the mass sum of the polyaniline and the pyrrole accounts for 5-20% of the mass of the functional high polymer material. The preparation of the composite membrane comprises steps of dissolving the functional high polymer material, preparing a mixed solution, spreading to form a membrane, and performing aftertreatment. As Py is uniformly dispersed on the composite membrane, the composite membrane provided by the invention is simple in preparation process and convenient to operate, is used for removing metal ions in wastewater, is easy to recycle and circulate, and is free of secondary pollution.

The invention provides an epoxy resin, the structural formula of which is shown in formula I, wherein n equals to 1 to 20, R is a repeating unit shown by formula II, formula III or formula IV, R1 and R2 are respectively methyl or hydrogen; the epoxy resin provided by the invention does not need other blended toughening materials, a functional group with good heat resistance and friction resistance and an epoxide group form the epoxy resin, and the epoxy resin has good toughness. The invention also provides a preparation method of the epoxy resin shown by formula I, which does not need to use a great amount of solvents with a high boiling point, reduces the cost, and avoids inconvenient in aftertreatment caused by use of solvents with a high boiling point.