Waste sulfuric acid regeneration and reuse equipment

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.

Graphite purification mixed acid regeneration and reuse equipment

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.

Quartz sand refining mixed acid regeneration and reuse equipment

Quartz sand is widely used in various chemical industries such as water treatment and new building materials. In addition to its main component silicon dioxide, quartz sand also contains iron oxide, clay, mica, and organic impurities. The surface of natural quartz ore generally has a layer of molten iron to form a film. Compared with some fine industries that have strict requirements for iron content, when using quartz sand in production, acid washing is necessary to reduce the iron content in quartz sand.

Glass thinning mixed acid regeneration and reuse equipment

During the process of glass thinning, high concentration fluorine-containing waste acid will be generated. Fluorinated waste acid contains HF, HSiF6, HC1, water-soluble fluorosilicates, water-soluble fluoroaluminates, water-soluble fluoroborate, and trace amounts of solid suspended solids.

Stainless steel pickling mixed acid regeneration and reuse equipment

In stainless steel manufacturing, a mixed acid composed of nitric acid and hydrofluoric acid is generally used for surface cleaning. After repeated use, the mixed acid gradually decreases as the concentration of metal ions increases, and the pickling effect also decreases.