2023-10-17

How is expanded graphite produced?

Due to the fact that graphite is a non-polar material, it is difficult to intercalate with small polar organic or inorganic acids alone, so oxidants are usually required. The chemical oxidation method generally involves soaking natural flake graphite in a solution of oxidants and intercalators. Under the action of strong oxidants, graphite is oxidized, causing the neutral network of planar macromolecules in the graphite layer to become positively charged planar macromolecules. Due to the extrusion effect of isotropic positive charges between positively charged planar macromolecules, the spacing between graphite layers increases, and the intercalation agent is inserted between the graphite layers to form expanded graphite.Expanded graphite will rapidly shrink when heated at high temperatures, with shrinkage times reaching tens to hundreds or even thousands of times. The apparent volume of contracted graphite reaches 250-300 milliliters/gram or more. The shrunken graphite is in the shap

2023-10-09

Application of graphite cathode carbon block

Carbon blocks made from high-quality anthracite, coke, graphite, etc. Used as a cathode for aluminum electrolysis cells. It is built at the bottom of the electrolytic cell, also known as the bottom carbon block. The characteristic cathode carbon block plays a dual role in conducting electricity and forming the inner lining of the electrolytic cell. Aluminum electrolysis production requires cathode carbon blocks to have high temperature resistance. The characteristics of resistance to molten salt erosion and conductivity, good thermal conductivity, high mechanical strength, good thermal shock resistance, and strong sodium corrosion resistance are conducive to energy conservation and improved cell life in aluminum electrolysis production.Graphite cathode is a conductive material used for the cathode of aluminum electrolysis cells, representing the development direction of the electrolytic aluminum industry. With the technological progress and development of the electrolytic aluminum ind

2023-03-14

What is the advantage of expanding graphite?

Compared with other adsorption agents, expansion graphite has many advantages. If the activated carbon is used for water removal, it will sink after the absorption of oil. At the same time as absorbing oil, it also absorbs water, which brings difficulty in post -treatment; the expansion graphite has a large absorption of oil, floating on the water after oil absorption, easy to catch and recycled, easy to use processing processing Cleaning, combustion, heating extraction and other methods will not form secondary pollution.

2023-08-28

Factors affecting the impregnation effect

The factors that affect the impregnation effect include: firstly, the impregnation process conditions (such as temperature and pressure), and secondly, the physicochemical properties of the impregnation.Influence of process conditions(1) Temperature (product preheating temperature, impregnation tank temperature, impregnation agent temperature), depending on the impregnation process: 1. The product is preheated too high and is prone to oxidation; The temperature is too low, and when it comes out of the preheating box, it quickly cools down and enters the impregnation tank. When the impregnating agent encounters cold products, its viscosity increases and its fluidity deteriorates, resulting in poor impregnation effect. 2. If the tank temperature is too high, asphalt is prone to oxidation condensation reaction, viscosity will also increase, and flowability will deteriorate; The tank temperature is too low, the fluidity of asphalt is also poor, and the impregnation effect is not ideal.(2)

2023-02-09

Graphite product form

(1) High pure graphite

The key role of graphite in battery technology

Which raw materials are selected for the production of traditional carbon materials

Various metallurgical furnace carbon blocks (such as blast furnace carbon blocks, ferroalloy furnace carbon blocks, calcium carbide furnace carbon blocks, and aluminum electrolysis cell cathode carbon blocks, etc.) are used at a certain high temperature. Therefore, carbon blocks should have high mechanical strength, thermal stability, and corrosion resistance, but the ash content requirements are not too strict. Except for the bottom carbon blocks used in aluminum electrolysis cells, it is not necessary to measure conductivity. The production of carbon blocks mostly uses anthracite as the aggregate and metallurgical coke as the filling material. To improve the thermal conductivity and corrosion resistance of carbon blocks, a certain amount of graphite fragments (or natural graphite) can be added. In order to improve the thermal conductivity and conductivity of carbon blocks, semi graphite carbon blocks can be produced by electrocalcining anthracite.The raw materials used for conductiv

2023-06-25

What are the advantages of high-purity graphite?

High purity graphite, also known as flake like high thermal conductivity carbon powder, is actually a product that we are talking about today. It also has characteristics such as high strength, oxidation resistance, high temperature resistance, good thermal shock resistance, small resistance coefficient, and easy precision machining. What are the advantages of high-purity graphite for everyone?High purity graphite is an ideal inorganic non-metallic material. High purity graphite has common advantages in the processing and manufacturing of structural casting molds, crucible pots for refining high purity metals, sintering molds, metal coating, and emission electron tubes. High purity graphite has corrosion resistance, with a uniform and fine matrix, which delays the corrosion degree of the product. In addition, it also has high thermal conductivity. The high content of fixed carbon ensures good thermal conductivity, shortens dissolution time, and significantly reduces energy consumption

2023-11-02

Optical and mechanical properties of graphene

Graphene has excellent optical properties, with an absorption rate of about 2.3% over a wide wavelength range, making it almost transparent. Within the thickness range of several layers of graphene, with each increase in thickness, the absorption rate increases by 2.3%. Large area graphene films also have excellent optical properties, and their optical properties change with the thickness of graphene. This is an unusual low energy electronic structure possessed by single-layer graphene. At room temperature, a voltage is applied to a double-gate double-layer graphene field-effect transistor, and the bandgap of graphene can be adjusted between 0 and 0.25 eV. When a magnetic field is applied, the optical response of graphene nanoribbons can be tuned to the terahertz range.When the intensity of the incident light exceeds a certain critical value, graphene's absorption reaches saturation. These characteristics allow graphene to be used as a passive mode-locked laser. This unique absorption

2023-03-06

What are the maintenance methods of graphite?

What are the maintenance methods of graphite? What are the ways to maintain graphite maintenance?1. Fragmentation1. Because graphite components and graphite components are all raw raw materials. If you find that there are cracks, looseness, and rupture in the parts, you may start to stuck from scratch.2. We may avoid rubbing as much as possible during the application.2. SupplierWhen maintaining graphite boxes, in order to better avoid the permanentness of the component precision, it will cause destruction during the replacement process. When you apply the process card point, film, component, etc., graphite suppliers will be given.3. Serial number application handling1. Maintain the reliability of the application and application of graphite boxes.2. Application for serial numbering for graphite, specific and execution of on -time cleaning, drying treatment, maintenance, inspection, and staff of specific majors to apply for application.