60results about How to "Smaller than surface" patented technology

The invention relates to a preparation process for large pore volume and light bulk density activated alumina, and belongs to the technical field of activated alumina preparation. According to the process, an aluminum sulfate solution and a sodium aluminate solution form a glue in a stainless steel neutralization kettle through a continuous co-current flow method; then an aging treatment is performed for a certain time in a stainless steel aging washing tank; the resulting material is pressed to a plate and frame filter press with a material pressing pump to carry out continuous washing to prepare primary pseudo-boehmite particles with large grains; the removed filter cake is acidified, and proper amounts of a pore expanding agent and a surfactant are added during the acidification process to carry out forming; the formed wet balls are placed in a drying box to carry out drying; and the dried small balls are loaded into a calcination activation furnace to carry out high temperature calcination and pore expanding. The process of the present invention has characteristics of low cost and low equipment corrosion, can performs continuous washing cycle, and has advantages of low wastewater discharging, less pollution, and the like. With the process of the present invention, the production cycle can be reduced, the labor intensity can be reduced, and various performance indicators of the prepared gamma-Al2O3 can meet the international advanced level after pore expanding by water vapor.

The invention discloses a nano-scale metal fluoride catalyst with a domain-limited structure as well as a preparation method and application thereof. The preparation process of the catalyst is as follows: under the presence of a mineralizer, carrying out crystallization reaction on a metal salt and an organic ligand in a solvent to prepare a MOF material, carrying out calcination carbonization treatment on the MOF material under an inert atmosphere to obtain a carbon-doped metal composite material, the , carrying out calcination and decarbonization on the carbon-doped metal composite materialin an oxidizing atmosphere to obtain a nano-scale carbon-doped metal composite material with a limited-domain structure, and carrying out gas-phase fluorination treatment on the composite material ina fluorination atmosphere for so as to obtain the nano-scale metal fluoride catalyst with the limited-domain structure. The metal active components in the catalyst are dispersed in an atomic level inthe carbon-based material, so that the catalyst has strong sintering resistance, and has the characteristics of strong anti-deposition carbon and the like; the unique structural characteristics of thecatalyst show good catalytic activity in the field of fluorine chemical industry.

The invention relates to a new carbon cathode, which comprises: graphite powder and the graphitized middle phase cover layer, wherein it is characterized in that: the average thickness of middle layer is 0.5-8 mum. And the invention also discloses a relative preparation, which comprises: (1) mixing 5-45% graphite powder and 95-55% pitch, adding the aggregation restrain agent at 0.5-5%, to polymerize at 380-480Deg. C; (2) separating; (3) drying; (4) carbonizing; (5) graphitizing. The invention covers graphitized middle phase layer over the graphite, to obtain better property, and it can restrain the solid particle aggregation, to control the diameter.

The invention relates to an oil exploitation ground transmission system and relative method, belonging to the oil exploitation technique. Said invention can measure the oil well, add liquid into oil well, heat the oil well and mixed transmit the oil gas. And said invention comprises four parts as aforementioned functions. Wherein, the oil well measuring part uses a liquid automatic measurer, which comprises a skip measurer, an automatic oil well switcher and a transmission tube. The invention uses industry computer to realize said functions, with high automatic degree, high practicability, and unmanned management.

The invention discloses a silver-nickel composite electrical contact material with nickel distributed in a net-shaped mode, and a preparation method of the silver-nickel composite electrical contact material, and belongs to the field of composite electrical contact materials. According to the silver-nickel composite electrical contact material with the nickel distributed in the net-shaped mode, the nickel is distributed in a silver base body in a continuous net-shaped mode. The silver-nickel composite electrical contact material is composed of, by mass, 50% to 98% of silver and 2% to 50% of nickel. The preparation method includes the steps of obtaining silver particles through a particle manufacturing method, annealing the silver particles, coating the surfaces of the silver particles with nickel powder through adhesives after weighing the material to obtain nickel-coated silver particle composite powder bodies, and obtaining the silver-nickel composite electrical contact material with the nickel distributed in the net-shaped mode through sintering and forming. In a silver-nickel composite material ingot blank, the pure silver areas are large and evenly distributed, the nickel is distributed in the continuous net-shaped mode, and the nickel is lengthened according to deformation of the silver base body after plastic working and distributed in the direction parallel to the pulling direction in a fibriform mode; the silver-nickel composite electrical contact material is high in conductivity, good in arc erosion resistance, easy to operate, short in technological procedure, low in energy consumption and suitable for industrial production, and raw materials can be easily obtained.

The invention provides a production process of a lithium battery negative electrode material. The production process comprises the following steps of 1, artificial graphite preparation: for impurity removal, preparing coal pitch, and performing catalytic modification on the coal pitch; for coke preparation, coking and calcining the modified coal pitch to obtain identical-nature coke; for shaping, performing shaping after the identical-nature coke is crushed and sieved, and obtaining pebble-shaped coke powder with the length-diameter ratio being 1 to 1.5; for graphitization, performing graphitization on the coke powder to prepare artificial graphite; 2, surface modification on the artificial graphite; 3, pre-oxidation: raising the temperature of the product obtained in the second step to be 300 to 330 DEG C, and then performing constant-temperature maintenance for 120 to 200min; 4, carbonization. The homemade low-impurity raw materials are used for preparing the negative electrode material; the peroxidation treatment is performed in a temperature programming mode before the carbonization; an amorphous carbon macromolecular chain of a coating layer is changed into a stable structure, so that the carbon macromolecular chain is in a thermodynamic stable state; the continuous carbonization yield is greatly improved; the performance of the negative electrode material is improved.

The invention discloses a gypsum-based composite binding material for extruded 3D printing and a preparation method thereof and relates to the field of civil engineering/3D printing materials. Aimingat defects in the prior art, the invention provides the gypsum-based composite binding material for extruded 3D printing. The binding material is prepared from the following components: gypsum, pre-excited material, mineral additives, a plasticized water reducing agent, a waterproof agent, a crystal habit improver, a cystallizing stabilizer, a retarder, a dispersing agent, a water-retentive and thickening admixture, an adhesive, an antifoaming agent, a crystal modifier, a lubricating agent and fibers. The binding material disclosed by the invention has the beneficial effects that the preparedgypsum-based composite binding material for extruded 3D printing is wide in source, excellent in liquidity and environmentally friendly and has excellent extrusion continuity, constructability, mechanical property, water seepage resistance and cracking resistance.

The invention relates to the fields of energy storage technology and power battery material technology, and specifically relates to a lithium iron phosphate-modified conductive carbon black composite electrode material preparation method. The preparation method comprises (1) a step of subjecting common conductive carbon black to annealing treatment, and then performing oxidation treatment in a strong oxidant to prepare the modified conductive carbon black; and (2) a step of preparing the lithium iron phosphate-modified conductive carbon black composite electrode material. According to the invention, by addition of modified SP which is easily dispersed, the composite electrode material prepared by the invention has small specific surface, thus facilitating battery preparation.

The invention discloses a high-nickel nickel-cobalt-manganese ternary single crystal material as well as a preparation method and application thereof. The general formula of the high-nickel nickel-cobalt-manganese ternary single crystal material is set to be LiNixCoyMnzRtO2, wherein x is more than or equal to 0.5 and less than or equal to 0.8, y is more than or equal to 0.1 and less than 0.3, z ismore than 0.1 and less than or equal to 0.2, and t is more than 0 and less than to 0.1. Sulfate ions are not introduced, so that washing water is not required. Thus, washing water does not need to beused, and pH control is not needed in a production process.

The invention provides a biological membrane carrier applied to sewage treatment. The biological membrane carrier comprises a magnetic carrier and a water membrane, wherein the magnetic carrier is prepared from a magnet and a magnet-conduction material; the water membrane is used for forming the biological membrane by microorganism adhesion, and is used for magnetizing a water membrane on the surface of the magnetic biological membrane; the magnetic carrier is arranged on the disk of the biological rotary disk, or is indirectly taken as the disk of the biological rotary disk. The biological membrane carrier is applied to the disk, the disk is applied to the biological rotary disk; during use, the biological membrane carrier rotating out of a contact reaction groove can be used for magnetizing the water membrane, dissolved oxygen in the magnetized water membrane is increased greatly, the microorganisms can be subjected to a full aerobic reaction, sewage treatment performance is improved, a part of organic matters can be mineralized, the absorption rate of water to light is increased, and the solubility of inorganic salt is improved through the magnetization of a water body, the growth of alga is facilitated, and removing performance is improved specific to element N and P, heavy metal elements and small particles.

The present invention relates to sugar refining technology, and the method of clarifying sugar liquid with quick lime includes the steps of slaking, adding lime cream and neutralizing. The present invention features the slaking step of mixing 50-300 mesh quick lime powder and water at 40-70 deg.c in the weight ratio of 1 to 2-10. The present invention has fast precipitating reaction speed, high lime cream quality, high lime utilization rate, no lime slag exhaust, raised sugar liquid clarifying effect and other advantages.

The invention discloses a preparation method of a nitrogen-containing silicon-oxygen-carbon compound composite negative electrode material of a lithium ion secondary battery, which comprises the following steps: stirring and mixing a silicon-oxygen precursor, a carbon source and a nitrogen source in an acidic aqueous solution to form slurry; drying the slurry, and carrying out high-temperature roasting, cooling, crushing and scattering under a protective gas to obtain a carbonized nitrogen-containing porous silicon-oxygen-carbon compound precursor; and blending the obtained nitrogen-containingporous silicon-oxygen carbide precursor with a carbon coating material, and carrying out high-temperature carbonization, cooling, crushing and scattering under a protective gas to prepare the nitrogen-containing silicon-oxygen-carbon compound composite negative electrode material with a uniform and stable coating structure for the lithium ion secondary battery. The lithium ion secondary battery nitrogen-containing silicon-oxygen-carbon compound composite negative electrode material prepared by the preparation method has good negative electrode material conductivity and cycle performance.

The invention discloses a light acrylic acid catalyst carrier which is prepared from the following components: 10-20wt% of bauxite, 3-5wt% of Hunan Pukou sands, 3-5wt% of hemi-mountain mud, 30-40wt% of pseudo-boehmite, 10-20wt% of Jiangxi East Bridge sands, 10-30wt% of kaolin and 10-20wt% of wood flour. The preparation method comprises the following steps of performing ball milling and mixing on the bauxite, the Hunan Pukou sands, the hemi-mountain mud and half of the kaolin to obtain a uniform base material, and then lining the base material to prepare a green body; and then performing ball milling and mixing on the pseudo-boehmite, the Jiangxi East Bridge sands, the wood flour and half of the kaolin to obtain a uniform facing material, then adding the facing material in a ball milling machine for continuously lining to prepare pellets, adding non-metallic compound crystal particles in the ball milling machine, spraying the surface of each pellet with a layer of colloid, and then performing high-temperature firing on the pellets to prepare the light acrylic acid catalyst carrier. The light acrylic acid catalyst carrier is large in water absorption, small in specific gravity, largein specific surface area, strong in adsorption force, simple in technology and low in cost.