45results about How to "Increase coking value" patented technology

The invention relates to the field of chemical engineering and discloses a preparation process of impregnated pitch. The preparation process includes the steps: (1) adding purified earth pitch serving as raw materials into a reactor, heating the raw materials to the temperature of 375-410 DEG C with the heating rate of 6-8 DEG C / min under the condition of stirring, and carrying out constant pressure pyrocondensation polymerization reaction for 30-75min at the temperature of 375-410 DEG C; and (2) stirring and decreasing the temperature in the reactor to be lower than 300 DEG C with the cooling speed of 8-10 DEG C / min. A softening point of the prepared impregnated pitch with the low quinoline insoluble content, the low softening point and the high residual carbon ranges from 84 DEG C to 91 DEG C, the quinoline insoluble content is less than 0.3%, the coking value ranges from 46% to 49.5%, the toluene insoluble content ranges from 15% to 22%, and the impregnated pitch can be used for impregnation and densification of carbon products such as graphite electrodes.

The invention discloses a graphite furnace lining used for high purity graphitization furnaces, and a preparation method thereof, and belongs to the technical field of graphite processing. The preparation method comprises steps of crushing, sieving, material preparing, dry blending, wet blending, moulding, primary roasting, primary dipping, secondary roasting, secondary dipping, tertiary roasting, and graphitization. In the raw materials of the graphite furnace lining, an aggregate is composed of calcined coke, pitch coke, and needle coke at a mass ratio of 80-82:10-15:5-8; wherein calcined coke is composed of particles with four following different particle size ranges: 0.5mm<=particle size<0.8mm, 0.335mm<=particle size <0.5mm, 0.075mm<=particle size<0.335mm, and particle size<0.075mm, and the weight amounts of the four particles account for 1 to 2%, 35 to 40%, 27 to 31%, and 27 to 37% respectively. Purity of the graphite furnace lining prepared via the preparation method is high; bulk density is large; porosity is low; ash content is low; oxidation resistance, compressive strength, and rupture strength are extremely excellent; and application requirements on high purity graphitization furnace linings are satisfied.

The invention belongs to the technical field of asphalt further processing, in particular to a preparation method of impregnant asphalt, aiming at providing a preparation method of the impregnant asphalt, which can be used for obtaining impregnant asphalt products with low QI (Quinoline Insoluble) content and high coking value. The preparation method comprises the following steps of: A, mixing kerosene and absorber oil into a mixed solvent in the weight ratio of 0.85-1.15:0.85-1.15; B, mixing the mixed solvent and asphalt with the coking value of 54%-58% in the weight ratio of 0.8-1.2:0.8-1.2, and stirring evenly at 250-300 DEG C; and C, precipitating the mixture obtained in the step B at 250-300 DEG C, filtering residuals and recycling the solvent of filter liquor to get the impregnant asphalt. The quinoline insoluble content in the impregnant asphalt got by using the method is 0.1%-0.5%, the softening point is 80-90 DEG C, and the coking value is 50%-54%, so the impregnant asphalt can meet the requirements for manufacturing high-power or ultrahigh-power electrodes, especially for manufacturing electrode joints.

The invention relates to a method for preparing an isotropic high-softening-point asphalt, the isotropic high-softening-point asphalt prepared by the method, application of the isotropic high-softening-point asphalt to the preparation of carbon fiber and a method for preparing carbon fiber by using the isotropic high-softening-point asphalt. The preparation process is a continuous production process, has wide raw material sources, good controllability, easiness for operation and no environmental pollution, and is suitable for industrialized production.

The invention provides a method for preparing an electrode pitch by using direct coal liquefaction residues as a raw material. The method comprises the following steps: 1, extracting the direct coal liquefaction residues by using an organic solvent to obtain extracted pitch; and 2, processing the extracted pitch in inert atmosphere at 350-420DEG C to obtain the electrode pitch. The softening point of the electrode pitch is 90-120DEG C, the QI content of the electrode pitch is lower than 0.2%, and the coking value of the electrode pitch is greater than 50%. The invention provides the cheap electrode pitch prepared by using the cheap direct coal liquefaction residues as a raw material, and the preparation method thereof.

A medium temperature coal pitch modification method includes the following steps: (1) mixing anhydrous AlCl3 and medium temperature coal pitch which is crushed to the particle size of 0.1 mm or less according to the weight ratio of (2-12):100 in a V-shaped mixer, and then sending into a reaction kettle; (2) introducing N2 to exclude air in the reaction kettle, heating up to 100 DEG C, carrying out heat preservation for 25-35 min, then heating up to 200-320 DEG C, carrying out a reaction for 1-5 h, cooling, and then taking out; and (3) crushing the material obtained after reaction in the step (2), then washing with dilute hydrochloric acid, filtering, carrying out vacuum drying, removing the modifier AlCl3, and thus obtaining the modified medium temperature coal pitch. Compared with raw material pitch, the modified medium temperature coal pitch obtained from modification by the method has higher softening point and coking value, and especially has the QI and beta resin greatly improved; and with the modified medium temperature coal pitch as a binder, a carbon material with excellent structure and properties can be prepared.

The invention discloses blend asphalt for coating a graphite anode material. The blend asphalt is prepared from the following components in percentage by weight: 50%-80% of coal asphalt and 20%-50% of petroleum asphalt, the softening point is at the temperature of 110-140 DEG C, the volatile matter is smaller than or equal to 60%, and the coking value is larger than or equal to 40%. The blend asphalt can reduce the volatile matter, increases the coking value and is easy to operate. Meanwhile, by means of the blend asphalt, the qualified rate of granularity of the coated graphite anode material can be increased by 5% or higher, the tap density can be increased by 5%-10%, and the comprehensive performance of the graphite anode material is improved finally.

The invention relates to a formed coke forming process, and discloses a method for preparing high-strength formed coke through cold press forming. A used binder is prepared from the following components in parts by mass: 0 to 20 parts of corn starch, 60 to 80 parts of asphalt, 0 to 5 parts of artificial graphite or a boron compound, 0 to 10 parts of cement or magnesium oxide, 0 to 20 parts of ethyl acetate and 0 to 2 parts of sodium hydroxide. The binder accounts for 8.6%-10.7% of the mass of the coke powder. The mixed binder and coke powder (metallurgical coke or petroleum coke) are premixeduniformly, a certain amount of water is added, and the formed coke is obtained through normal-temperature cold press molding. The formed coke prepared by the method has the excellent characteristics of high cold and hot strength, good thermal stability, high forming rate, low cost and the like.

The invention relates to a modified pitch production device. A pitch inlet of a flash column on the upper portion of a flash modification reaction still is connected with a raw material pitch conveying pipeline, and an oil gas mining opening of the flash column is connected with an oil gas condenser cooler. A pitch outlet of a lower reaction kettle is connected with a furnace tube inlet of a first tubular heating furnace, and a furnace tube outlet of the first tubular heating furnace is connected with a pitch inlet of a secondary modification reaction still. One path of a pitch outlet of the secondary modification reaction still is connected with a first pitch conveying pipeline on the upstream portion of the first tubular heating furnace, and the other path of the pitch outlet is connected with a pitch inlet of a fractionating tower. An oil gas mining opening of the secondary modification reaction still is connected with an oil gas inlet in the lower portion of the fractionating tower. An oil gas mining opening of the fractionating tower is connected with the oil gas condenser cooler, and a modified pitch mining opening of the fractionating tower is connected with a modified pitch outwards-conveying pipeline. A double-still two-step reaction method is adopted, the generation quantity of an alpha-component and a beta-component can be effectively controlled, and the product quality is controllable. The process is simple and easy to carry out, and the modified pitch production device saves energy, and is environmentally friendly and suitable for various pitch raw materials.

The invention discloses a low-temperature carbonization method of directly heating formed coke. The low-temperature carbonization method comprises the steps of: performing advanced co-grinding treatment on asphalt and a certain amount of powder material (the powder material is coke powder or pulverized coal); then adding the mixture into the coke powder to be mixed uniformly; then adding a certain amount of water and a dimethylbenzene activator in the uniformly mixed material; performing normal-temperature briquetting forming and volatilization treatment; and finally directly heating the formed coke to realize low-temperature carbonization of the formed coke, thereby obtaining the carbonized formed coke. Through the measures, the low-temperature carbonization and solidification of the formed coke is realized through direct heating on the premise that the quality of the formed coke is guaranteed. Only by pre-treating the raw materials, can the formed coke be carbonized at low temperature by direct heating under an air, nitrogen or carbon dioxide atmosphere; therefore, the low-temperature carbonization method of directly heating the formed coke, disclosed by the invention, has the advantages of simplifying the subsequent process flow, reducing the production cost and breaking the limitation that the formed coke in the traditional formed coke process must be indirectly heated to a high temperature for the carbonization under a sealing condition.

The invention provides a coal tar pitch binder and a preparation method thereof. The coal tar pitch binder is calculated in parts by weight, consisting of 100 parts of coal tar pitch, 10-30 parts of polyether polyol, 10-50 parts of unsaturated fatty acid, 10-30 parts of tackifying resin, 10-30 parts of solubilizer, 1-10 parts catalyst composition. The preparation method is to mix and heat coal tar pitch and solubilizer in a reaction kettle until the pitch is completely dissolved at 180°C, then add polyester polyol, unsaturated fatty acid, tackifying resin and catalyst in sequence, mix well and keep warm for 6 hours to obtain coal tar pitch asphalt binder. The coal tar pitch binder prepared by the invention has high coking value, low toxicity and low odor, and can significantly improve the high-temperature bonding strength of magnesia-carbon bricks.

The invention relates to a method for preparing an isotropic high-softening-point asphalt, the isotropic high-softening-point asphalt prepared by the method, application of the isotropic high-softening-point asphalt to the preparation of carbon fiber and a method for preparing carbon fiber by using the isotropic high-softening-point asphalt. The preparation process is a continuous production process, has wide raw material sources, good controllability, easiness for operation and no environmental pollution, and is suitable for industrialized production.

The invention discloses a preparation method of petroleum-based high softening point spinning pitch and belongs to the technical field of spinning pitch. The preparation method includes the steps of preheating ethylene tar, performing wiped film vaporization to remove light components at the temperature of 220-280 DEG C under the vacuum degree of 80-120Pa so as to obtain ethylene tar pitch, transferring the ethylene tar pitch into a reactor, heating to 330-360 DEG C, performing constant-temperature thermal polycondensation to obtain ethylene tar pitch softening at 200-225 DEG C, performing wiped film vaporization to the ethylene tar pitch to remove part of the light components at the temperature of 340-370 DEG C under the vacuum degree of 80-120Pa so as to finally obtain spinning pitch which softens at 270-285 DEG C. The preparation method has the advantages of continuity in operation, simplicity in process flow, high controllability and suitability for industrial production. The prepared spinning pitch is high in coking value, excellent in spinning performance, and available for continuous spinning more than 10000m in length.

The present invention discloses a method for preparing a prebaked anode with high-sulfur coke. The high-sulfur coke is calcinated independently and grinded into powder in the prebaked anode formulation. The method comprises the following steps: A, calcinating the high sulfur coke with a sulfur content of 3-5% at 1250-1350 DEG C in a rotary kiln independently, then storing in a high-sulfur coke dedicated rear-calcination cabin; B, preparing the high-sulfur coke after calcination into powder; and C, dosing the powder with a sulfur content of 3-5% according to a normal production process, wherein the weight ratio of S / Ca in the raw material is (36-62):1. An embodiment of the invention can solve the problems that the molding raw block is low in density and the products are easy to crack in calcinations through calcinating the high sulfur coke independently, storing independently and making into the powder as an anode material; and can improve the oxidation resistance of the anode and reduce the environmental pollution caused by the high sulfur coke in the prior art.

The invention relates to a tempering adhesive, which belongs to the graphite electrode pitch adhesive. A tempering adhesive is composed of the following components by weight percentage: 20%-50% of medium-temperature asphalt, and 80%-50% of modified asphalt. It improves the coking value of the binder pitch, increases the yield of raw products after roasting by 1.5-4%, increases the density and strength of products by 1.5-3%, and reduces the labor intensity of operators.

The invention relates to the field of chemical engineering and discloses a preparation process of impregnated pitch. The preparation process includes the steps: (1) adding purified earth pitch serving as raw materials into a reactor, heating the raw materials to the temperature of 375-410 DEG C with the heating rate of 6-8 DEG C / min under the condition of stirring, and carrying out constant pressure pyrocondensation polymerization reaction for 30-75min at the temperature of 375-410 DEG C; and (2) stirring and decreasing the temperature in the reactor to be lower than 300 DEG C with the cooling speed of 8-10 DEG C / min. A softening point of the prepared impregnated pitch with the low quinoline insoluble content, the low softening point and the high residual carbon ranges from 84 DEG C to 91 DEG C, the quinoline insoluble content is less than 0.3%, the coking value ranges from 46% to 49.5%, the toluene insoluble content ranges from 15% to 22%, and the impregnated pitch can be used for impregnation and densification of carbon products such as graphite electrodes.

The invention relates to the technical field of lithium battery materials, in particular to a method for modifying silicon-carbon composite negative electrodes by asphalt modification process derivatives. The modified asphalt has a low content of light components, a relatively high molecular weight, and a carbon-hydrogen ratio greater than 1.5. During the carbonization process, the molecular decomposition and polymerization reaction is smooth, and the escape of volatile gases is greatly reduced. Therefore, it has a higher coking value after carbonization, and a pitch nano-coated carbon layer with dense and low pore defects is formed on the surface of nano-silicon and graphite. The stabilized pitch-coated silicon-carbon composite anode material can avoid excessive consumption of active lithium ions during charge and discharge, and significantly improve the first Coulombic efficiency of the battery; in addition, the dense, low-porosity nano-coated carbon layer can also be used It can effectively buffer the volume expansion of the inner layer silicon, significantly delay the occurrence of battery diving, and improve the Coulombic efficiency and cycle retention rate of the material.

The invention discloses blend asphalt for coating a graphite anode material. The blend asphalt is prepared from the following components in percentage by weight: 50%-80% of coal asphalt and 20%-50% of petroleum asphalt, the softening point is at the temperature of 110-140 DEG C, the volatile matter is smaller than or equal to 60%, and the coking value is larger than or equal to 40%. The blend asphalt can reduce the volatile matter, increases the coking value and is easy to operate. Meanwhile, by means of the blend asphalt, the qualified rate of granularity of the coated graphite anode material can be increased by 5% or higher, the tap density can be increased by 5%-10%, and the comprehensive performance of the graphite anode material is improved finally.

The invention relates to a flashing and pressure holding combined retention tower electric tracing heating temperature holding modified pitch production technology. The production technology is a single-heat production technology, only one tube furnace is adopted for heating in the process, energy-saving effect is remarkable, and flashing separation and continuous heating temperature holding thermal polymerization are combined. Flashing separation is conducted firstly on pitch, then oxidization thermal polymerization is conducted by controlling electric heating temperature holding accurately, an obtained target product meets the requirement of the carbon industry for pitch better, cohesiveness is excellent during mixed kneading of a carbon element mixture, and coking value is higher after roasting.

The invention discloses an inorganic modified coal pitch and a preparation method thereof. The preparation method of the inorganic modified coal pitch comprises the following steps of: 1, mixing: mixing 80-95 percent by mass of original coal pitch and 5-20 percent by mass of inorganic particles; and 2, modified heat treatment: putting the mixture obtained in the step 1 to a reaction vessel, heating the reaction vessel to the modified temperature of 150-300 DEG C, stirring and modifying for 1.0-6.0h to obtain the inorganic modified coal pitch. The TI, QI and Beta resin contents and the coking value of the inorganic modified coal pitch are all remarkably improved. The volume density, the compression strength, the bending strength, the oxidation resistance and the electrolysis expansiveness resistance performance of a carbon electrode for aluminium electrolysis and a TiB2 / C composite cathode material, which are prepared from the inorganic modified coal pitch, are remarkably improved.

The invention relates to a form coke forming process, and discloses a method for preparing high-strength form coke by cold pressing. The mass ratio of the binder used is: 0-20 parts of corn starch, 60-80 parts of asphalt, 0-5 parts of artificial graphite or boron compound, 0-10 parts of cement or magnesium oxide, 0-20 parts of ethyl acetate, 0-2 parts of sodium hydroxide. The total ratio of the binder is 8.6%-10.7% of the coke powder mass. Pre-mix the mixed binder and coke powder (metallurgical coke or petroleum coke), then add a certain amount of water, and often warm and cold press to obtain molded coke. The form coke prepared by the invention has excellent characteristics such as high cold and hot strength, good thermal stability, high molding rate and low cost.