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Resource utilization of titanium dioxide waste acid for preparation of polyferric sulfate
During the production process of titanium dioxide, waste acid (sulfuric acid) with mass fraction of 18%-25% is generated. The waste acid was evaporated and concentrated to obtain ferrous sulfate monohydrate and concentrated waste acid with a mass fraction of about 55%. Analysis showed that the average yield of ferrous sulfate monohydrate was 17.33%, containing impurities such as Pb, Zn, Hg, Cr, Ni, etc. After removing impurities from ferrous sulfate monohydrate, polymeric ferric sulfate polymer coagulant solution was prepared through oxidation, hydrolysis, polymerization and other reactions. The results of process research showed that when the dosage of oxidant H2O2 was 1.5 times of the theoretical dosage and the acid iron ratio was between 0.2 and 0.35, the final product PFS solution had a Fe2+ mass fraction of less than 0.1%, a total iron mass fraction of 11.12%, pH=1.6, a basicity of 14.5%, a density of 1.48 g/cm3, insoluble matter content less than 0.1%, and other metal ion concentrations were low, which met the qualified product standards of Water Treatment Chemicals-Poly Ferric Sulfate (GB/T 14591-2016).
Resource utilization of titanium dioxide waste acid for preparation of polyferric sulfate
During the production process of titanium dioxide, waste acid (sulfuric acid) with mass fraction of 18%-25% is generated. The waste acid was evaporated and concentrated to obtain ferrous sulfate monohydrate and concentrated waste acid with a mass fraction of about 55%. Analysis showed that the average yield of ferrous sulfate monohydrate was 17.33%, containing impurities such as Pb, Zn, Hg, Cr, Ni, etc. After removing impurities from ferrous sulfate monohydrate, polymeric ferric sulfate polymer coagulant solution was prepared through oxidation, hydrolysis, polymerization and other reactions. The results of process research showed that when the dosage of oxidant H2O2 was 1.5 times of the theoretical dosage and the acid iron ratio was between 0.2 and 0.35, the final product PFS solution had a Fe2+ mass fraction of less than 0.1%, a total iron mass fraction of 11.12%, pH=1.6, a basicity of 14.5%, a density of 1.48 g/cm3, insoluble matter content less than 0.1%, and other metal ion concentrations were low, which met the qualified product standards of Water Treatment Chemicals-Poly Ferric Sulfate (GB/T 14591-2016).
Resource utilization of titanium dioxide waste acid for preparation of polyferric sulfate
PAN Linyi (author) / TAI Shijun (author) / ZHANG Xujie (author) / TANG Xuemei (author) / MA Lei (author)
2025
Article (Journal)
Electronic Resource
Unknown
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Sulfuric acid process titanium dioxide acidolysis waste harmless resource utilization method
| European Patent Office | 2021
| European Patent Office | 2022