Construction process of biogas digester with novel structure

The invention discloses a construction process of a methane tank with a novel structure, which comprises the following steps: (1) carrying out integrated concrete pouring on a cylinder and a dome structure to form a methane tank body; (2) arranging a plurality of grid plates of which the diameter is the same as that of the column body in the biogas digester body, and (3) arranging a helical ribbon feeding and discharging mechanism for feeding raw materials and discharging biogas residues; (4) arranging a biogas slurry and biogas mud discharge mechanism, and inserting a pipeline of the discharge mechanism to the bottom of the biogas digester body; (5) arranging a sludge pit at the bottom of the biogas digester, and arranging a pressure injection water pipe parallel to the sewage discharge water pipe to go deep into the sludge pit; (6) arranging a temperature sensor, a pH sensor and an electric heater in the biogas digester body; and (7) mixing, feeding, deslagging, sewage discharging, temperature ...

Method for synthesizing cerium-doped stable tetragonal-phase zirconia nanopowder by sol-gel method

The invention relates to a method for synthesizing cerium-doped stable tetragonal-phase zirconia nanopowder by a sol-gel method. The method comprises the following steps: 1) selecting a certain amount of zirconium sources, cerium sources, surfactants and complexing agents, and respectively dissolving in a mixed solvent of water and ethanol to obtain mixed liquids; 2) dropwise adding the mixed liquids of zirconium sources, cerium sources and surfactants to the complexing agent liquid, and sufficiently stirring to obtain a mixed liquid; 3) heating the mixed liquid in a water bath under the condition of stirring, wherein the temperature of the water bath is 90-95 DEG C; 4) placing the gel obtained by heating in the water bath into an oven and drying at 120 DEG C; and 5) pulverizing the dried gel and calcining at 700-800 DEG C for 2 hours to obtain the final product. The synthesis process of the product is simple, the product is spherical particles of which the diameter is 10-20nm and has the ...

Hydrothermal synthesis method of zinc-doped tin oxide with hollow cubic structure

The invention provides a hydrothermal synthesis method of zinc-doped tin oxide with a hollow cubic structure, comprising the following steps: dropwise adding a mixed aqueous solution of SnCl4 and Zn(NO3)2 to a NaOH aqueous solution with a certain concentration, wherein, the volume ratio of the mixed aqueous solution of SnCl4 and Zn(NO3)2 to the NaOH aqueous solution is 1:3-1:15, the concentration of SnCl4 is 0.1094-0.1144mol/L, the concentration of Zn(NO3)2.6H2O is 0.0106-0.0156mol/L, and the concentration of NaOH is 1.875mol/L; evenly stirring and transferring the mixed solution to a hydrothermal reaction kettle so that the filling degree reaches 80%; carrying out isothermal reaction at the temperature of 180-190 DEG C for 25 hours; and finally centrifuging, washing and drying the obtained reaction product to obtain the zinc-doped tin oxide. The hydrothermal synthesis method has simple process and easy operation; and the synthesized zinc-doped tin oxide particles have controllable size ...

Rapid construction template for large-scale concrete biogas digester

The invention discloses a rapid construction template for a large concrete methane tank. The rapid construction template comprises a methane tank cylindrical template and a methane tank vault template, the biogas digester cylindrical template comprises a peripheral circular ring module, a central circular ring module, a connecting plate, a vertical supporting rod, a horizontal supporting rod, a connecting screw and a cylindrical template, the biogas digester vault template comprises a vault module and a support. The peripheral circular ring module, the central circular ring module, the vertical supporting rods, the cylindrical template and the like are developed at a time and can be repeatedly used during disassembly and reconstruction of the biogas digester, the templates and the modules are of a building block type, the building period is short, the building cost is low, the templates do not adopt injection molding parts, mold development cost is avoided, the building cost is saved, and ...

Synthetic method of graphite-like modified nano-zinc stannate

A synthetic method of graphite-like modified nano-zinc stannate includes the following steps that first, a certain amount of SnCl4 and a certain amount of Zn(AC)2 are dissolved into mixed solvent of deionized water and absolute ethyl alcohol, and a mixed solution is obtained; second, a NaOH solution is dripped into the mixed solution of SnCl4 and Zn(AC)2, the mixed solution is shifted into a reaction still after being stirred, the temperature of the mixed solution is kept at 200 DEG C, and the obtained Zn2SnO4 product is separated out, washed and dried; third, a certain amount of Zn2SnO4 and a certain amount of glucose are added into deionized water to be stirred and subjected to ultrasonic treatment for 30 min; fourth, the mixed turbid solution of Zn2SnO4 and glucose is shifted into the reaction still, the temperature of the mixed turbid solution is kept at 180 DEG C for 10 h, and the obtained product is separated out, washed and dried; fifth, the product in the fourth step is subjected ...

Gold nano-rod and up-conversion nano-crystal composite nano-material as well as preparation method thereof

The invention discloses a gold nano-rod and up-conversion nano-crystal composite nano-material as well as a preparation method thereof. The composite nano-material is characterized in that a gold nano-rod is a core layer, silicon dioxide is an isolating layer and an up-conversion nano-crystal is a shell layer; the gold nano-rod is prepared by firstly using a seed method, cetyltrimethyl ammonium bromide (CTAB) on a surface of the gold nano-rod is replaced with methoxy polyethylene glycol (mPEG) to obtain the gold nano-rod of which the surface is coupled with mPEG; under a slightly alkaline condition, tetraethylorthosilicate (TEOS) is hydrolyzed to obtain a gold nano-rod composite structure covered with silicon dioxide, an up-conversion nano-crystal shell layer doped with rare earth is obtained through a urea hydrolysis method, and finally, an AuNR/SiO2/Y2O3:Yb,Er composite nano-structure is formed. A sample prepared by the invention has multiple functions of photothermal conversion and fluorescence ...

Method for preparing nano LiFePO4/C electrode material

The invention relates to a method for preparing a nano LiFePO4/C electrode material. The preparing method comprises the following steps: first, synthesizing a compound of iron phosphate and poly furfuryl alcohol by using an in-situ polymerization limit method, then grounding the compound with a lithium salt, uniformly mixing, and finally preparing the LiFePO4/C composite material by high temperature sintering in an inert atmosphere or reducing atmosphere. According to the method disclosed by the invention, the particle size of the electrode material can be effectively reduced, and the transmission efficiency of electrons can be remarkably improved due to the coated carbon layer. The composite material has high specific capacity, excellent rate performance and cycling performance, and is suitable for the high rate charging/discharging requirements.

Method for preparing nitride aluminum/graphite laminated composite ceramic material

Preparation method of LiNixCoyMnzO2 serving as ternary positive electrode material of lithium ion battery

The invention relates to a preparation method of LiNixCoyMnzO2 serving as a ternary positive electrode material of a lithium ion battery, wherein x is more than or equal to 0.1 and is less than or equal to 0.5, y is more than or equal to 0.2 and is less than or equal to 0.6, z is more than or equal to 0.1 and is less than or equal to 0.5, and the sum of x, y and z is equal to 1. The preparation method comprises the following steps: dissolving soluble lithium salt, nickel salt, cobalt salt and manganese salt into a mixed solution of deionized water and absolute ethyl alcohol, stirring uniformly, pouring the materials into a reaction kettle and gathering, putting the reaction kettle into a blowing dry oven, reacting for a period of time, and then drying, grinding and calcining the obtained product to obtain the ternary positive electrode material, namely LiNixCoyMnzO2, wherein x is more than or equal to 0.1 and is less than or equal to 0.5, y is more than or equal to 0.2 and is less than ...

Preparation method of lithium nickel manganese oxide anode material for high-rate lithium ion battery

The invention relates to a preparation method of a lithium nickel manganese oxide anode material for a high-rate lithium ion battery. The method comprises the following steps: preparing a manganese source compound solution and a carbonate solution respectively; adding the carbonate solution into the manganese source compound solution to obtain spherical MnCO3 precipitate; thermally decomposing the spherical MnCO3 precipitate in an air atmosphere of which the temperature is 300-500 DEG C for 1-10 hours; adding spherical MnCO3 obtained after thermal decomposition, a lithium source compound and a nickel source compound into a solvent a for mixing, drying and grinding to obtain precursor powder; and sintering the precursor powder to obtain the lithium nickel manganese oxide anode material. The technical scheme provided by the invention has the advantages of low cost, simple process route, low energy consumption, suitability for industrial mass production and the like.

Low-temperature sintered lead-free microwave dielectric ceramic and preparation method thereof

The invention provides low-temperature sintered lead-free microwave dielectric ceramic and a preparation method thereof. By adopting the method, continuous adjustable dielectric constant is realized by regulating the Mg/Ca ratio of [Cax, Mg(1-x)]TiO3 powder which serves as a base material; low-temperature sintering of the ceramic material at 800-900 DEG C is realized by adding CaO-Al2O3-B2O3-SiO2 microcrystalline glass. The method comprises the following steps: firstly, synthesizing [Cax, Mg(1-x)]TiO3 ceramic powder, and synthesizing CaO-Al2O3-B2O3-SiO2 microcrystalline glass; then, performing ball-milling, dosing, tape-casting, molding and batching out, sintering and annealing to obtain a low-consumption multi-layer ceramic dielectric material with excellent performance. According to the method, the microcrystalline glass/ceramic green-compact is molded by adopting thick film tape-casting, and multiple layers of the green compact are laminated and subjected to low-temperature sintering ...