7results about How to "Increase coking value" patented technology

The invention provides a preparation method of isostatic pressing graphite with a superfine structure, belongs to the technical field of preparation of isostatic pressing graphite, and aims to solve the technical problem that the product reliability is influenced due to low dispersion efficiency and easy agglomeration of graphene in the existing one-step mixing. The method comprises the following steps: step S1, aggregate preparation; s2, gradient mixing: adding graphene accounting for 1-3% of the total weight of the basic aggregate into the basic aggregate, mixing by adopting a gradient mixing method, premixing the basic aggregate accounting for 40-60% of the total weight with all graphene to prepare a master batch, and finally mixing the master batch with the residual basic aggregate to obtain a composite reinforced aggregate; step S3, mixing and kneading; step S4, powder pressing; step S5, isostatic pressing molding; step S6, roasting; and step S7, graphitizing. According to the preparation method, a gradient mixing method is adopted, so that the enhancement effect of the graphene can be fully exerted, and the problems that the graphene is easy to agglomerate and is difficult to uniformly disperse in the micron powder are effectively solved through a step-by-step dilution mechanism.

The application discloses a prebaked anode, characterized in that the raw material for preparing the prebaked anode comprises aggregate and binder, wherein the aggregate comprises calcined petroleum coke and / or coal-based coke, and the binder comprises low-ash high-caking bituminous coal. The prebaked anode product prepared according to the application has better homogeneity and better product performance, the raw material source of the prebaked anode is expanded, and the dependence of the prebaked anode raw material on petroleum coke and coal pitch is reduced.

The application discloses a kind of liquid lithium battery negative pole coating material and preparation method thereof, belong to lithium battery negative pole material technical field.The application uses ethylene tar as raw material, sequentially through filtration, distillation, polymerization, blending process, produce the liquid lithium battery negative pole coating material provided by the application is used for the coating treatment of lithium battery graphite negative pole material, can be fully wetted with graphite negative pole material, bonding;The "core-shell" structure formed after the graphite negative pole material is treated using the liquid coating material, including core and the coating layer coated on the surface of core.Coating layer is firm, stable, and presents uniformity.The liquid lithium battery negative pole coating material is in liquid state at normal temperature, and has good flowability;Coking value is higher;It is easy to store, convenient for transportation and use.

The invention relates to the field of preparation of carbon materials, and discloses a preparation process of high-coking-value low-ash-content adhesive pitch, which comprises the following steps: mixing refined medium-temperature coal pitch, ethylene tar and heavy alkylbenzene to form a homogeneous blending precursor liquid phase; p-benzoquinone and tetrahydronaphthalene are mixed to form a hydrogen transfer working solution, and after hexamethylenetetramine is added, the hydrogen transfer working solution is injected into the asphalt liquid phase in a submerged mode in the positive pressure heating process for a constant-temperature reaction; and then continuing to heat, implementing programmed pressure oscillation circulation control, and finally performing flash evaporation treatment, discharging and cooling to obtain the bonded asphalt. According to the preparation method, through cooperative regulation and control of liquid-phase dehydrogenation activation, bridging condensation, high-temperature polycondensation and devolatilization exhaust, the coking value of the bonded asphalt is increased, the ash content is reduced, a coke body with a compact structure after carbonization can be obtained, and the preparation method is suitable for preparation of carbon products such as graphite crucibles.

The invention provides green cathode paste for aluminum electrolysis, which comprises green cold-rammed lining paste and green cold-rammed steel bar paste which are made of carbonaceous aggregate and a water-soluble biological binder. The invention also provides a preparation method of the green cathode paste for aluminum electrolysis. The preparation method comprises the following steps: preparation of the water-soluble biological binder: carrying out a reaction on cereal starch hydrolyzed syrup and catechol under the condition of p-toluenesulfonic acid; adding a weakly alkaline substance, adjusting the pH value, weighing the carbon aggregate and the binder, and uniformly mixing the carbon aggregate and the binder; mixing and kneading: pouring the carbon aggregate and the binder into a mixing and kneading pot, and carrying out dry mixing and wet mixing in sequence; and packaging: taking the wet-mixed paste out of a pot, cooling, packaging and warehousing. According to the preparation method of the green cathode paste disclosed by the invention, the harm to human health and the pollution to the environment in the production and use processes of the traditional asphalt cathode paste are eliminated by using the water-soluble biological binder, and the coking value of the cereal starch hydrolyzed syrup serving as the binder is remarkably increased by using the preparation method of the green cathode paste disclosed by the invention; and the strength requirement of the green cathode paste of the aluminum electrolysis cell is met.

The present application relates to the field of pitch, and discloses a kind of impregnated pitch and its preparation method and application, which comprises: (1) oil slurry I is separated, and the intermediate distillate oil with initial boiling point 390-420 DEG C and final boiling point 450-470 DEG C is obtained;(2) in the presence of inert gas I, the intermediate distillate oil is carried out first heating reaction, and heavy distillate oil is obtained;(3) in mixed gas, the heavy distillate oil is carried out second heating reaction, and impregnated pitch is obtained;The volume ratio of inert gas II and air in the mixed gas is 1:2-5;The temperature of the second heating reaction is at least 30 DEG C lower than that of the first heating reaction;The pressure of the first heating reaction and the second heating reaction is independently 0.05-1 MPa respectively.The impregnated pitch prepared by the method of the present application has the advantages of low softening point, low quinoline insoluble content and high coking value, and can enhance the bulk density of graphite electrode when applied to graphite electrode.

The invention provides a preparation method and an application method of a composite modified coal pitch binder, and relates to the technical field of coal pitch binder modification. The preparation method of the composite modified coal pitch binder comprises the following steps: firstly, selecting titanium boride as a template, coal pitch as a carbon source and potassium hydroxide as an activating agent; fully mixing the three components in proportion to obtain a mixture; carrying out high-temperature heating treatment on the mixture, and cooling to obtain a heat-treated mixture; then crushing, washing and drying to obtain a titanium boride-graphene oxide composite modifier, and adding the titanium boride-graphene oxide composite modifier into asphalt to prepare the titanium boride-graphene oxide composite modified coal asphalt binder. The titanium boride-graphene oxide composite modified coal pitch binder has the beneficial effects that the strength, sodium expansion resistance and structural stability of a carbon / graphite electrode are improved through a modification mechanism of the titanium boride-graphene oxide composite modified coal pitch binder, and carbon emission in the electrode preparation process is reduced, so that the ecological environment is protected.