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| Separation and recovery of iron, nickel and chromium from the evaporative crystalline product of spent pickling solutions from steel processing |
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Received:December 28, 2020
Revised:December 30, 2020
Accepted:January 04, 2021
Published Online:August 18, 2021
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| DOI： |
| KeyWord:ferrous sulfate; nickel; crystallization; purification; separation and recovery |
| Author | Institution |
| LI Yan-lin |
Yunnan Chihong Zn&Ge Co. Ltd. |
| LI Min-ting |
Kunming University of Science and Technology |
| WEI Chang |
Kunming University of Science and Technology |
| LI Xing-bin |
Kunming University of Science and Technology |
| DENG Zhi-gan |
Kunming University of Science and Technology |
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| Abstract: |
| In view of the characteristics that the crystal produced from stainless steel pickling wastewater evaporative crystallization contains iron, nickel, chromium and sulfuric acid, the process of dissolution-recrystallization-purification was carried out to separate iron and nickel and chromium in the crystal. The results show that Iron in the crystal mainly exists in the form of FeSO4?H2O. Temperature and initial concentration of iron are the important factors for the crystallization efficiency and purity of ferrous sulfate. With the increase of crystallization temperature reduction and the initial iron concentration, crystallization efficiency of iron will increase, but ferrous sulfate purity is reduced. The ferrous sulfate primary product of a wet base purity of 93% was obtained under solution temperature of 64oC, crystallization temperature of I step and II step being 30oC and 5oC respectively, crystallization time of I step and II step all being 30 mins, speed of agitator of 300 r/min. The primary product was purified through resolution- recrystallization, and the ferrous sulfate product meeting Chinese standard GB/T 10531-2016 II type was prepared. The crystallization mother liquor produced from the preparation process of ferrous sulfate primary product was dealt with evaporation concentration-freeze crystallization- neutralization-preparation of sodium sulfate evaporation, material of Ni 4% and anhydrous sodium sulfate purity being 99.42% were prepared, respectively. |
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