Graphite ore alkaline acid process

Graphite ore alkaline acid process

Alkali acid method is a commonly used method for purifying graphite ore, which removes impurities from graphite and improves the purity of graphite through two processes: alkali melting and acid leaching.

Process flow

  • 1.Raw ore crushing:Crushing graphite raw ore into smaller particles for subsequent purification processes.
  • 2.Alkali melting:The crushed ore reacts with alkali (such as sodium hydroxide) under high temperature conditions, and the acidic impurities in graphite react chemically with alkali to form soluble salts.
  • 3.Cooling and Curing:After alkali melting, the material needs to be cooled to room temperature and then cured for the subsequent acid leaching process.
  • 4.Acid leaching:React the solidified material with acid (such as hydrochloric acid or sulfuric acid), using acid to react with metal oxide impurities, and convert some impurities that did not react during the alkali melting process into soluble salts.
  • 5.Washing:Wash the material after acid leaching to remove impurities and separate it from graphite. During the washing process, water or solvents can be used to remove dissolved salts and impurities.
  • 6.Drying and Screening:Dry the washed material and then screen to obtain high-purity graphite products.

Technological advantages

  • 1.High purity purification:Alkali acid method can purify graphite ore to a grade of 99.5%, which is very suitable for applications with high purity requirements for graphite.
  • 2.Simple Equipment:The equipment used for alkaline acid purification of graphite ore is relatively simple, with lower initial investment costs, which is beneficial for reducing production costs.
  • 3.Easy to operate:The operation process of alkaline acid method for purifying graphite ore is relatively simple, easy to manage and control.

The alkaline acid method for purifying graphite ore also has some disadvantages and needs to be noted

  • 1.Equipment corrosiveness:The alkali and acid used in the alkaline acid purification process have strong corrosiveness to the equipment, and corrosion-resistant materials need to be used to construct the equipment.
  • 2.Wastewater pollution:The wastewater generated after purification operations is severely polluted and requires an effective waste liquid treatment system to reduce its impact on the environment.
  • 3.Graphite loss:During alkali melting and acid leaching, graphite may be lost, and measures need to be taken to reduce graphite loss and improve graphite recovery rate.
  • Alkali acid purification of graphite ore is a high-purity purification method, but attention should be paid to issues such as equipment corrosion, wastewater treatment, and graphite loss. In practical applications, it is necessary to comprehensively consider costs, benefits, and environmental impacts to ensure the safety and environmental protection of the production process.