Graphite, a non-metallic mineral with a variety of excellent properties, has important applications in new energy materials, chemical industry, machinery, electronics and other fields. Since graphite raw ore contains impurities, it needs to be enriched through mineral processing methods before it can be used for industry. The following will introduce you to a graphite beneficiation method and the required equipment, which can effectively remove impurities in graphite and improve the taste and quality of the concentrate. This method includes primary crushing, secondary crushing, fine grinding, flotation and dehydration and drying.
Use the table of contents below to navigate through the guide:
01Graphite ore primary crushing process
Graphite raw materials with a particle size greater than 0-750mm are sent to the jaw crusher for crushing by a vibrating feeder or conveyor belt. After being screened by a vibrating screen, primary crushed materials with a particle size of 0-250mm are obtained. Qualified primary crushing products are generally stored in the silo, while those larger than 250mm are returned to the jaw crusher for re-crushing. The vibrating screen can choose circular vibrating screen or linear vibrating screen.
02Graphite ore secondary crushing process
The primary crushed products enter the electromagnetic iron separator through the vibrating feeder and conveyor under the silo to remove metal impurities, and then are sent to the cone crusher for crushing. The secondary crushed products are sent to the circular vibrating screen or linear vibrating screen. After screening, products larger than 0-30mm are obtained. Products with particle sizes larger than 30mm are returned to the cone crusher for re-crushing.
(Energy-saving and high-efficiency ball mill)
03Graphite ore fine grinding process
The secondary crushed products are sent to the energy-saving ball mill for grinding through the vibrating feeder, and a certain amount of water is added for mixing. After grinding for a period of time, the products are sent to the spiral classifier for classification to obtain ore particles with a particle size of 0.074-0.8mm. , and then sent to the flotation process. Particles with a particle size greater than 0.8mm are sent to a small ball mill for regrinding. After grinding to meet the requirements, they are sent to the flotation process.
The fine grinding process uses an energy-saving ball mill. The main purpose is to protect the layered structure of natural flake graphite, thereby improving the quality of graphite concentrate. At the same time, the use of energy-saving ball mills can reduce the number of grinding equipment and the number of fine grinding times.
04Graphite ore flotation process
Particles with a particle size of 0.074-0.8mm are sent to the mixing tank and mixed with water until they become a thin paste. They are sent to the flotation machine for a rough selection. During the rough selection, a mixed oil of kerosene and diesel is added to aid flotation. The coarsely separated products enter the fine grinding ball mill for grinding, and then sent to the flotation machine for 7-8 times of beneficiation. After dehydration, the flotation tailings are sent to the tailings reservoir for storage. The flotation equipment adopts height difference settings, which can reduce the number of slurry pumps used and reduce production costs. During flotation, the liquid level is controlled by a float level controller, and foam identification can be controlled by an infrared proximity detector to improve control accuracy.
05Graphite ore dehydration and drying process
The flotation concentrate is sent to a vacuum filter for dehydration, and then dried at 350-450°C. The clean water produced during the dehydration process can be sent to the fine grinding and flotation processes for recycling.
The above content is the graphite ore beneficiation method and equipment system. The entire process adopts a mechanical method to effectively avoid the pollution caused by chemical method exchange. Various equipment are connected with conveyor belts and pipelines, which can form an automated production process and greatly reduce personnel consumption. The specific process flow settings need to be adjusted according to the actual situation, especially the characteristics of the ore itself need to be considered. The properties of ores in different regions and mining areas are different. The mineral processing method cannot be copied blindly. The graphite ore beneficiation plan should be based on the factory settings, ore characteristics, and production requirements. Only with customized design can the concentrate recovery rate be improved, production costs reduced and production efficiency improved.