32 results about "Cryptocrystalline" patented technology

The invention relates to a jade-like Ru porcelain and a preparation method thereof. The jade-like Ru porcelain comprises a body and a glaze, wherein the preparation raw material of the body is of kaolin, and the preparation raw materials of the glaze comprises the following components in percentage by weight: 55%-80% of feldspar, 10%-25% of calcite, 5%-15% of cryptocrystalline quartz, 2%-10% of alkaline stone, 1%-8% of bone ash and 1%-8% of plant ash. According to the jade-like Ru porcelain disclosed by the invention, the Ru porcelain glaze with jade quality is combined with the body with thejade quality, a traditional Ru porcelain firing process is adopted for enabling the porcelain body to show the jade-like translucent state, color and luster are elegant, pale and graceful, a brand new visual impact and an artistic effect can be further generated, and the millenary Ru porcelain can further realize the historic breakthrough. A new species is added in the family of the Ru porcelain,the cultural connotation of the Ru porcelain is enriched, and the added value and the market share of Ru porcelain products are further improved.

The invention belongs to the technical field of oxidized graphene, and particularly relates to a method for preparing small oxidized graphene from cryptocrystalline graphite.The method mainly solves the problems of existing oxidized graphene preparing methods that purity is low, toxicity is high, technology is complicated and cost is high.According to the method, purified cryptocrystalline graphite, concentrated acid and strong oxidant are evenly mixed for reaction in an airtight environment at the temperature of 80-120 DEG C, a reaction mixture is slowly poured into an excessive amount of deionized water, uniform stirring is conducted, then an aqueous hydrogen peroxide solution with the mass concentration of 25% is added till turbid liquid becomes brown or luminous yellow, acid pickling and washing are conducted till pH value becomes 6-7, and then centrifugal separation is conducted to generate the small oxidized graphene.The ratio of the mass of purified cryptocrystalline graphite to the volume of concentrated acid is 1 : (20-80), and the mass ratio of purified cryptocrystalline graphite to purified cryptocrystalline graphite is 1 : (3-10).

The invention relates to a collecting agent for flotation of cryptocrystalline graphite ore. The collecting agent is a combined collecting agent AM, wherein the combined collecting agent AM is composed of the following components in parts by weight: 60-70 parts of diesel oil, 20-30 parts of ether alcohol and 10-20 parts of C12H25-N(CH3)2CH2COO. The collecting agent has high collecting capacity for cryptocrystalline graphite and excellent selectivity and can obtain high-carbon graphite concentrate from low-grade cryptocrystalline graphite ore through beneficiation, wherein the fixed carbon content of the high-carbon graphite concentrate is 95%.

The invention discloses a fine flaky-cryptocrystalline mixed graphite separation technique which comprises the following steps: primary rough grinding and rough separation, quintic regrinding and sextic concentrating, and middling centralized processing. According to the technique, in the rough separation step, the grinding fineness is -0.074mm, and the content is 90-95%; in the concentrating step, the regrinding fineness is -0.045mm, and the content is 90-95%; and thus, the graphite monomer is sufficiently dissociated, thereby sufficiently ensuring the fixed carbon content and recovery rate of the concentrated concentrate. The technique adopts gradually decreased low concentrating concentrations in multiple concentrating process to ensure the dispersity of ore slurry, thereby solving the severe problem of entrapped impurities in floatation foam; and thus, in the final concentrate, the fixed carbon content is 91.35%, and the recovery rate is 91.30%, thereby solving the problems of low technical indexes, low grade, low recovery rate and high cost in the fine flaky-cryptocrystalline mixed graphite concentrate separation, so that the fine flaky-cryptocrystalline mixed graphite ores are utilized in an efficient, economical and reasonable way.

The invention relates to the technical field of nanometer preparation, in particular to a method for peeling off graphite to obtain graphene based on a shear force machine. The method comprises the specific steps that 5-1*10<9> mg of one or more of massive crystalline graphite, crystalline flake graphite, cryptocrystalline graphite, expanded graphite and highly oriented pyrolytic graphite are weighed, 50-5*10<6> mL of water and a mixing solvent with 10 or smaller carbon atom alcohol are added, the uniformly-mixed solution is placed into the shear force machine for performing peeling for 0.3-120 h, standing is performed, the centrifuging speed is 100-10000 rpm / min, and post-treatment is performed, so that graphene is obtained. The preparation method is mild in condition, the reaction is green, adopted raw materials and solvents are simple, no liquid waste pollution exists, large-scale preparation can be performed, and the method has the application prospect for producing graphene.

A carburizing heat treatment process for a fatigue-resistant metal sliding block comprises the steps that S1, the sliding block is preheated to 350 DEG C, and the preheating time is 1 h; S2, the sliding block is subjected to carburizing and quenching; S3, the sliding block is subjected to cryogenic cooling, wherein the temperature is minus 80 DEG C, and the time is 2 h; and S4, the sliding block is tempered, wherein the temperature is 240 DEG C, and the time is 3 h. According to the carburizing heat treatment process for the fatigue-resistant metal sliding block, controllable atmosphere carburization is adopted, multiple stages of strong carburization and diffusion are alternately carried out, it is avoided that carbon is gathered on the surface to form cementite, and meanwhile a carburized layer has a good and gentle hardness gradient; and then, in combination with the modes of conducting carburizing slow cooling and conducting two times of heating and quenching, extremely fine cryptocrystalline martensite is obtained, then the retained austenite is further reduced through cryogenic treatment, and therefore the contact fatigue resistance of the sliding block is improved.

The invention provides a flotation method of cryptocrystalline graphite, which comprises the following steps: S1, carrying out first-stage ore grinding on the cryptocrystalline graphite to obtain slurry I; s2, the slurry I is subjected to first-stage flotation, and slurry II is obtained; s3, the slurry II is subjected to second-stage ore grinding, and slurry III is obtained; s4, the slurry III is subjected to second-stage flotation, and slurry IV is obtained; s5, an organic solvent capable of being mixed and dissolved with water is added into the slurry IV, then third-section flotation is conducted, and slurry V is obtained; and S6, carrying out filter pressing on the slurry V, and drying to obtain the nano-scale cryptocrystalline graphite. And a surfactant adopted in the third-stage flotation comprises polyethyleneimine.

The invention discloses a lithium ion battery cathode material and a preparation method thereof, which lower the cost of the lithium ion battery cathode material and improve the high-energy density thereof. The lithium ion battery cathode material takes more than one of natural crystalline graphite, natural cryptocrystalline graphite and natural crystalline vein graphite as matrixes, a non-graphitic carbon material is coated outside the matrixes, and the coated particles are compounded with a conductive material. The preparation method of the lithium ion battery cathode material comprises thefollowing steps of mixing and drying a liquid phase, carbonizing, carrying out high-temperature treatment and compounding. Compared with the prior art, the graphite with lower carbon content is takenas a raw material to greatly reduce the raw material cost; by adopting a hot air drying mode, the preparation process is simplified and a coating layer is more solid and compact; and by adopting lower carburizing temperature and the temperature for high-temperature heat treatment, energy consumption is reduced, and product cost is further lowered.

The invention discloses a soil improvement agent suitable for grounding works in high soil resistivity environments, which comprises the following components in percentage by weight: 14-18wt% of modified starch super absorbent resin with the molecular weight of 20,000-40,000, 42-52wt% of 150-200 meshed cryptocrystalline graphite powder, 26-38wt% of calcium-magnesium-based soil gelling agent (calcium-magnesium-based bentonite), 2-4wt% of calcium-aluminum-based soil affinity agent (calcium-aluminum hydroxide mixture), 1-3wt% of soil blowing agent (sodium silicate), 1-3wt% of zinc metal preservative, and 1-3wt% of lanthanide rare earth metal slag. The soil improvement agent disclosed by the invention utilizes the water absorption characteristic of the super absorbent resin to achieve the purpose of preservation of soil moisture, utilizes the electrical conductivity of the graphite material to reduce the contact resistance between the metal conductors and soil, adds a soil gelling agent and other components to result in a more compact and stable transition conducting layer, adds the lanthanide rare earth metal slag to enhance the electrical conductivity, and adds the zinc metal preservative to prolong the service life. The soil improvement agent is especially suitable for soil improvement in geological environments with high soil resistivity and extremely-droughty geological environments.

The invention discloses a method for purifying aphanitic graphite flotation concentrate. The method includes steps of (1), removing reagents by means of ultra-fine grinding; (2), carrying out two-section heating rinsing and concentrating on the aphanitic graphite flotation concentrate; (3), soaking the aphanitic graphite flotation concentrate in acid at the constant temperatures of 90 DEG C for 1 hour; (4), removing impurities by means of reverse flotation. The method has the advantages that the aphanitic graphite flotation concentrate with the carbon (C) content of 85-90% is used as a raw material and is treated by the aid of processes for 'removing the reagents by means of ultra-fine grinding, carrying out the two-section heating rinsing and concentrating, soaking the aphanitic graphite flotation concentrate at the constant temperatures of 90 DEG C for 1 hour and removing the impurities by means of reverse flotation' for characteristics of small particle sizes of graphite crystals in the aphanitic graphite flotation concentrate, stable properties at the normal temperatures, good inherent flotability, the residual flotation reagents on the surfaces of minerals and the like, and accordingly high-purity graphite concentrate with the carbon (C) content higher than 99% can be obtained.

The invention discloses steel for a bearing ring of a large-size shield tunneling machine and a heat treatment method thereof. The steel consists of the following elements in percentage by weight: 0.41-0.45 percent of C, 0.17-0.37 percent of Si, 0.60-0.80 percent of Mn, 0.90-1.20 percent of Cr, 0.15-0.25 percent of Mo, 0.50-0.70 percent of Ni, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.00018 percent of H, less than or equal to 0.0015 percent of O and the balance of Fe and normal impurities. The experiment steel subjected to alloying design has good hardenability, the hardening layer depth can be over 40mm in the end quenching experiment and is 30mm higher than that of 42CrMo; the bearing ring of the large-size shield tunneling machine is wholly subjected to quenched-tempered heat treatment, and after the surface is subjected to induction hardening, the surface hardening layer texture is cryptocrystalline martensite, and the matrix structure is tempered sorbite; the surface has high hardness and has the average value of 58.5-60.3HRC; the core has good toughness, the impact toughness AKv value at the temperature of 20 DEG C below zero is over 106J; and the steel has proper hardness, and the average value of the hardness is 272-283HB. Meanwhile, a control process window of an actual production cooling medium is wide, and the cooling speed is over 10 DEG C per second. Therefore, the requirement on the comprehensive mechanical property of the steel for the bearing ring of the large-size shield tunneling machine can be met.