2023-04-19

Common ways to expand graphite

1. Chemical intervening method: The prepared initial raw materials are high -carbon scales -shaped graphite. The remaining chemical reagents such as concentrated sulfuric acid (more than 98 %), hydrogen peroxide (more than 28 %), potassium permanganate, and other industrial -grade reagents are used The general steps for preparation are: Different proportion of hydrogen dioxide solutions, natural scales, and concentrated sulfuric acids with different proportion at the appropriate temperature with different adding procedures, react for a certain period of time under continuous stirring, and then wash it to neutrality and centrifugal separation. After dehydration, it is dry at 60 ° C vacuum.2. Electrochemical Law: Treatment of graphite powder in a strong acidic fluid to make expansion graphite, hydrolysis, cleaning and dryness. It mainly uses sulfuric acid or nitric acid as strong acid. Essence3. Ultrasonic oxidation method: During the process of preparation of swelling graphite, the ult

2023-11-09

Graphite chlorination roasting method

The chlorination roasting method involves adding a certain amount of reducing agent to graphite powder, roasting it at a certain temperature and under a specific atmosphere, and then introducing chlorine gas for a chemical reaction to transform valuable metals in the material into chlorides and complexes with lower melting and boiling points in the gas phase or condensed phase, and escape them, thereby separating them from their remaining components and achieving the goal of purifying graphite.Impurities in graphite can be decomposed into simple oxides such as SiO2, Al2O3, Fe2O3, CaO, MgO, etc. under the action of reducing agents after being heated at high temperatures. These oxides have higher melting and boiling points, as shown in Table 1, while their chlorides or metal complexes formed with other trivalent metal chlorides (such as CaFeCl4, NaAlCl4, KMgCl3, etc.) have lower melting and boiling points, as shown in Table 2. The vaporization and escape of these chlorides improve the p

2023-11-06

Advantages and disadvantages of high carbon graphite purification methods

The flotation method is one of the conventional mineral purification methods that consumes less energy and reagents, and has a lower cost. This is a major advantage of the flotation method for purifying graphite. However, using flotation to purify graphite can only achieve a limited increase in its grade. For flake graphite, using multi-stage grinding not only cannot completely dissociate its monomer, but also is not conducive to protecting the large scale of graphite. Therefore, using flotation to further improve graphite grade is neither economical nor scientific. To obtain high carbon graphite with a carbon content of over 99%, chemical methods must be used to purify the graphite.（1） Chlorination roasting method. The low roasting temperature and low chlorine consumption of the chlorination roasting method significantly reduce the production cost of graphite. At the same time, the carbon content of graphite products is equivalent to that after treatment with hydrofluoric acid, and t

2023-02-09

Graphite chloride roasting method

The chloride roasting method is to mix graphite with a certain reducing agent to bake at high temperature in specific equipment and atmosphere. The price in the material is transformed into a metal chloride with gas or condensed phase. Purified process.

How to turn a graphite block into a carbon increase agent

How to turn graphite blocks into carbon increases Gentle blocks are indispensable in the production process of carbon and graphite products in the production process of carbon and graphite products. Equipment external forces to get rid of the adhesion between the molecular structure of the raw material and break the raw materials. Since then, everyone can divide them into rough, shattered, sophisticated, fine grinding, etc., but they can divide them according to the broken and boring size and their particles. The same industrial production has a broken specification for different industrial production.Today, as far as everyone is concerned, the three crushing levels in the production of graphite products can be divided into pre -fragmentation, medium crushing and fine grinding. The crushing in front of the burning furnace is generally broken up to 50-70mm on the large graphite block of 200mm. The medium crushing means that the particle size is broken after forging. At this moment, the

2022-11-23

What are the ways to improve the service life of graphite molds?

Graphite molds should be produced and processed by cutting methods to improve the smoothness of the graphite mold surface and reduce the degree of adhesion between the molten metal and high-purity graphite. The composition of the carcass powder is one of the factors that cause the metal plastic film to stick to the high-purity graphite. Because iron is a strong carburizing agent, if the carcass is iron-based, there will be obvious reaction and melting between the carcass and the abrasive tool, causing the carcass melt to stick to the high-purity graphite and destroying the graphite mold. It is suggested that when calcining the iron-based carcass, a strong release agent should be brushed on the surface of the blade and the abrasive tool to reduce the adhesion of the abrasive tool during mold unloading, reduce the degree of damage, and increase the service life of the abrasive tool.2. The fracturing damage of the grinding tool is also related to the resistance of the graphite materia

2023-03-09

Many new main uses of graphite have already been developed and designed

Many new main uses of graphite have long been developed and designed with the development trend of scientific and technological progress. Graphite has many new main uses. High -purity graphite products are used for high -purity metallurgical industry, electronics industry, Chinese nuclear industry and mold processing; general graphite products can be used as a wall -building raw material for mining with aluminum electrolytic grooves, non -metallurgical tunnel furnaces, and non -ferrous metal furnaces. Calcium residual raw materials can be used as carbon increases for ironmaking industry. There are many types of carbon quality raw materials used to seepage nitrogen, including artificial synthesis of graphite, petroleum coke, casting focus, and pure natural graphite.Graphite products are at least within 2000 degrees. This is because carbon must be graphite at a high temperature natural environment of 2000-3300 degrees at a high temperature and natural environment of at least 10 days and

2023-02-10

Graphite development direction

Mainly deep processing, realize some important engineering projects, build a complete industrial chain, and guide the healthy and scientific development of the graphite industry. The first is the transformation of old technical equipment; the second is the current hot technical products of the development of charcoal graphite materials, such as the negative materials of lithium -ion batteries, the industrialization and intensiveization of the same -sex graphite, hig

2023-03-13

The production process and use of expansion graphite

The expansion graphite is a loose and porous worm -like substance prepared by the procedure of graphite scales through the intervening, washing, drying, and high temperature. When the expansion graphite encounters high temperature, it can instantly swell 150 ~ 300 times in volume, which changes from sheet to worm -shaped, thereby loose structure, porous and bending, expanded surface area, improved surface can be enhanced. In this way, it increases its softness, return elasticity and plasticity.The expansion graphite is widely used, and the main development directions are as follows:1. Granules expand graphite: Small particles expand graphite mainly refer to 300 purposes that can expand graphite, and its expansion volume is 100ml/g. This product is mainly used for flame retardant coatings, and its demand is very large.2. Expansion of the swelling temperature at height: The starting expansion temperature is 290-300 ° C, and the expansion volume is ≥230ml/g. This type of expansion graphi

2023-11-28

Introduction to the Application of Graphite Powder in Industry by Graphite Manufacturers

Due to the characteristics of graphite powder, graphite manufacturers introduce that graphite powder is widely used in industrial applications such as chemical plants, crude oil, metallurgy, forging, lubrication, and sealing. Let's follow graphite manufacturers to learn about the applications of graphite powder in industry:Graphite powder has strong conductivity and heat transfer, high melting point, good lubrication, ductility, and chemical resistance. Graphite powder can withstand strong acid, strong alkali, organic solution and other etching.Graphite powder can be used as a conductive raw material for the production and manufacturing of electrical grade, carbon brushes, carbon tubes, carbon rods, television tube coatings, etc. in the electrical equipment industry. Graphite powder can be used as a refractory insulation material, as well as a protective film for graphite tongs, ironmaking, and steel castings.Graphite powder can be used as a lubricating material and as a lubricant in