| Physical and Chemical Properties | Chemical properties dark green solution, soluble in water, insoluble in alcohol. It is hygroscopic and toxic. |
| Use | Use 1, mainly used for tanning leather, the production of hydrogen front raw materials. The dye industry is used for the production of reactive black dyes. The printing and dyeing industry is used as a mordant. 2, for a variety of leather and fur main tanning and retanning, especially in high-grade leather tanning. |
after acidification of sodium dichromate mother liquor with sodium bisulfate solution 40~42 ° Bé or sulfuric acid in lead-lined or enamel glass reactor under internal stirring, slowly add sucrose reducing agent to reduce hexavalent lead. At the end of the reaction, the solution is kept boiling to facilitate the complete reaction. The reaction product is a syrup-like viscous liquid. Add water and adjust the content to 40~42 ° Bé. After natural cooling, freeze to below 10°C in a cooling crystallizer to make part of the sodium sulfate form mirabilite crystals. The liquid basic chromium sulfate product is prepared by centrifugal separation. After concentration and drying, a solid basic chromium sulfate finished product is obtained.