Graphite purification mixed acid regeneration and reuse equipment

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Waste acid regeneration and reuse equipment

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Product Description

Product Introduction

In the manufacturing process of high-purity graphite as a negative electrode material for batteries, a mixed acid composed of hydrochloric acid, nitric acid, and hydrofluoric acid is used for surface pickling to remove impurities from the graphite. As the pickling time increases, the concentration of various ions in the pickling solution also increases, while the acid concentration decreases and the cleaning effect decreases. In order to maintain the cleaning ability of the pickling solution, it is necessary to maintain the concentration of nitric acid, hydrofluoric acid, and hydrochloric acid within the specified range. Therefore, it is necessary to regularly monitor the concentration of nitric acid, hydrofluoric acid, and hydrochloric acid in the pickling solution, and determine the discharge amount of the pickling solution and the supplement amount of new acid based on the monitoring data. This forms the mixed waste acid discharged from the pickling process.

After long-term experimental research, our company has adopted the negative pressure evaporation concentration process to treat this type of mixed acid. Hydrochloric acid, nitric acid, and hydrofluoric acid can be recovered and mixed with new acid in the workshop for reuse. This can not only save neutralization costs, but also achieve waste resource utilization, save the purchase of new acid, and reduce the cost of subsequent wastewater treatment. This process is currently a relatively economical and effective solution.

Product Introduction
Waste acid regeneration treatment equipment is a type of equipment specifically designed for the treatment and recycling of waste acid. It adopts advanced technology and processes to effectively remove harmful substances from waste acid and convert them into recyclable substances. Our company uses negative pressure evaporation for the industrial treatment of pickling waste liquid, which is not only used for the recovery and treatment of waste hydrochloric acid, but also for the concentration treatment of dilute sulfuric acid, phosphoric acid, and electroplating waste liquid.

Application scope
The application range of waste acid regeneration treatment equipment is wide, covering multiple industry fields. Especially in industries such as chemical engineering, waste acid regeneration and treatment equipment can play an important role.

Equipment characteristics
1.Negative pressure evaporation concentration
2.Externally heated evaporator
3.The recycled regenerated acid has high purity
4.Recycled by-products can be used as a chemical raw material

Product name: Waste sulfuric acid regeneration and reuse equipment

Process Introduction
Based on the solubility of ferrous sulfate in sulfuric acid solution and the non volatile nature of sulfuric acid, a steam indirect heating and negative pressure evaporation concentration process is adopted. The waste sulfuric acid solution is evaporated and concentrated to reach a certain concentration of sulfuric acid. The concentrated solution is cooled to precipitate ferrous sulfate in the form of crystals, and then solid-liquid separation is carried out to obtain ferrous sulfate crystals and regenerated sulfuric acid containing a small amount of ferrous sulfate.

Product name: Waste hydrochloric acid regeneration and reuse equipment

Process Introduction：
According to the characteristics of hydrogen chloride being easily volatile and soluble in water, as well as the solubility of ferrous chloride in hydrochloric acid solution, a steam indirect heating and negative pressure evaporation concentration process is adopted; The gas produced by evaporation condenses into dilute hydrochloric acid, which is then returned to the pickling workshop and mixed with concentrated hydrochloric acid for reuse; After the waste acid solution is evaporated and concentrated to reach a certain concentration of iron ions, it enters the negative pressure crystallization system to precipitate in the form of ferrous chloride crystals, and then separated to obtain the product of ferrous chloride. This technology can recover over 90% hydrochloric acid from waste acid solution, allowing iron ions to precipitate in the solid form of FeCl2.
Process Flow Diagram：

Product name: Dilute sulfuric acid concentration equipment

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Waste acid regeneration and reuse equipment