Graphite crushing treatment and batching

Graphite crushing treatment and batching

Before batching, the large pieces of calcined petroleum coke and needle coke must be crushed, ground and screened.

Medium crushing is usually about 50mm material through jaw crusher, hammer crusher, roller crusher and other crushing equipment to further crush to the 0.5-20mm granular material required for batching.

Grinding is the process of grinding carbonaceous raw materials to small powdery particles with a particle size of less than 0.15mm or 0.075mm by means of suspension roller mill (Raymond mill), ball mill and other equipment.

Screening is a process of dividing the crushed material with a wide size range into several particle grades with a narrow size range through a series of sieves with uniform openings. Current electrode production usually requires 4-5 particle sizes and 1-2 powder grades.

Graphite crushing treatment and batching is a production process that calculates, weighs and focuses on aggregates, powders and binders of various particle sizes according to formula requirements. The scientific suitability of the formula and the stability of the batching operation are one of the most important factors affecting the product quality index and performance.

The formula needs to determine 5 aspects:

① Choose the type of raw material;

② Determine the proportion of different types of raw materials;

③ Determine the particle size composition of solid raw materials;

④ Determine the amount of binder;

Types of molding, equipment and products produced:

squeeze operation

① Cooling material: Disk cooling material, cylindrical cooling material, kneading cooling material, etc. to discharge volatile matter, lower to suitable temperature (90-120℃) to increase the cohesive force, make the paste lump even and facilitate molding 20-30 min

② Loading: Press baffle plate —- 2-3 times blanking —- 4-10MPa compaction

③ Preload: pressure 20-25MPa, time 3-5min, and vacuum at the same time

④ Extrusion: Press down baffle—-5-15MPa extrusion—-shear—-turn into cooling water tank

Technical parameters of extrusion: compression ratio, temperature of press material chamber and nozzle, cooling material temperature, pre-pressing pressure time, extrusion pressure, extrusion speed, cooling water temperature

Inspection of green bodies: bulk density, appearance knocking, profiling

⑤ Determine the type and amount of additives.

Kneading: The process of kneading and kneading into plastic paste is called kneading.

Kneading process: dry mixing (20-35 min) wet mixing (40-55 min)

The role of graphite crushing treatment and batching kneading:

① During dry mixing, all kinds of raw materials are mixed evenly, and at the same time, solid carbonaceous materials of different particle sizes are evenly mixed and filled, so as to improve the density of the mixture;

② After adding coal tar, the dry material and asphalt are mixed evenly, and the liquid asphalt is evenly coated and infiltrated on the surface of the particles to form a layer of asphalt bonding layer, which binds all the materials together to form a homogeneous plastic paste. conducive to forming;

③ Part of the coal pitch penetrates into the internal voids of the carbonaceous material, which further improves the density and cohesiveness of the paste.

Forming: The forming of carbon materials refers to the process in which the kneaded carbon paste is plastically deformed under the external force exerted by the forming equipment, and finally a green body (or raw product) with a certain shape, size, density and strength is formed. process.

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