First of all, let's understand the processing knowledge of graphite

The beneficiation and processing method of crystalline graphite: crystalline graphite has good natural buoyancy, and the flotation method is used in China for beneficiation. Since the size of flake graphite is one of its most important quality indicators, the sorting method adopts multi-stage grinding and multi-channel separation processes to select large flakes of graphite as early as possible. Collectors commonly used in flotation include kerosene, diesel oil, etc., foaming agents include No. 2 oil, No. 4 oil, etc., regulators include lime and sodium carbonate, and corrosion inhibitors include water glass.

Cryptocrystalline graphite beneficiation processing method: Cryptocrystalline graphite crystals are extremely small, so it is also called microcrystalline graphite. Graphite particles are often embedded in clay and are difficult to separate. Due to the high grade of raw ore (generally containing 60% to 80% carbon), many graphite mines directly crush the mined ore and sell graphite powder products. The Lutang Graphite Mine in Hunan once established a flotation plant in the 1950s to flotation microcrystalline graphite, but production was discontinued due to high costs. At present, some units are still conducting research on new microcrystalline graphite flotation technologies (such as oil agglomeration flotation, etc.).

Purification and processing of graphite products: Modern industry requires graphite products to develop in two aspects. One is to require large-scale crystals and high purity, and the other is to require ultra-fine particles of graphite products (such as less than 1 μm or 0.5 μm). The most mature process of chemical purification of graphite is to melt caustic soda and graphite at 700 ° C, wash to neutrality, and then treat and wash with hydrochloric acid to make the carbon content of graphite reach 98% to 99%. It can also be treated with hydrofluoric acid to obtain high-purity graphite.

The following Nortel Carbon Graphite Processing will introduce to you the precautions for choosing graphite blocks

1. In the case of high speed or high pressure, effective methods must be used to derive frictional heat. When used in a medium with crystallization, attention should be paid to flushing.

2. For carbon graphite rings or bearings inlaid with metal parts, attention should be paid to the difference in thermal expansion coefficient between the two. The choice of interference during assembly should be reasonable and should not be too large.

3. Before installation, the two working surfaces of the friction pair must be smoothed, and all parts must be cleaned. After the friction pair is installed, the running-in operation is required. First, low-pressure and low-speed operation or short-term start-up work is repeated. After running in, it will be put into normal operation.

4. Carbon---graphite is a brittle material, and its mechanical strength is generally lower than that of metal. Therefore, we should pay full attention to this feature when designing the structure, and be careful when processing and assembling, and it is strictly forbidden to hit it with hard objects to avoid cracking.

5. The type selection must be based on the working conditions of the equipment, considering factors such as pressure, line speed, medium, and abrasive materials. If necessary, the type should be selected after passing the test.