hat
Li jwenn nan Chromat sodyòm pa asidifikasyon oswa electrolysis. Nan pwodiksyon endistriyèl la, metòd asid silfirik ak pwosesis elektwolatik yo pwensipalman itilize. Sulfuric asid metòd: nan premye evapore solisyon an net nan Chromat sodyòm nan yon konsantrasyon sèten, dilye ak losyon, pandan l ajoute konsantre asid silfirik fè asidifikasyon sa yo ki kromat nan sodyòm konvèti nan dichromat la sodyòm. Apre evaporasyon de fwa, silfat la sodyòm se konplètman retire, ak Lè sa a, nan klarifikasyon, pran likid la klarifye yo ki ap pèmèt li dwe refwadi a 40 ℃ anba a, ki te swiv pa kristalizasyon, Lè sa a, li se jwenn apre separasyon solid-likid.
eng
It is obtained from sodium chromate by acidification or electrolysis. In the industrial production, sulfuric acid method and electrolytic process are mainly used. Sulfuric acid method: at first evaporate the neutral solution of sodium chromate to a certain concentration, diluted with lotion, adding concentrated sulfuric acid to do acidification such that the sodium chromate is converted into the sodium dichromate. After evaporation twice, the sodium sulfate is completely removed, and then by clarification, take the clarified liquid to enable it to be cooled to 40℃ below, followed by crystallization, then it is obtained after solid-liquid separation.