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Metal Mine ›› 2023, Vol. 52 ›› Issue (03): 250-258.

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Study on Remediation Effect of Glomalin Related Soil Protein on the Ecological Environment of Vanadium-Titanium Magnetite Tailings

LU Sai1 GU Haihong1,2,3,4 AI Yanjun1 ZHANG Yixuan1 LI Fuping1,2,3,4   

  1. 1. College of Mining Engineering,North China University of Science and Technology,Tangshan 063210,China;2. Hebei Key Laboratory of Mining Development and Security Technology,Tangshan 063210,China;3. Hebei Industrial Technology Institute of Mine Ecological Remediation,Tangshan 063210,China;4. Tangshan Key Laboratory of Resources and Environmental Remote Sensing,Tangshan 063210,China
  • Online:2023-03-15 Published:2023-04-12

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Abstract: In order to investigate the effect of Glomalin related soil protein (GRSP) released by Arbuscular mycorrhizal fungi (AMF) on the ecological restoration of vanadium-titanium magnet tailings,laboratory culture experiments of alfalfa were carried out. Exogenous applied different forms and doses of glomalin related soil protein to study the nutrient environment,aggregate structure and heavy metals availability in vanadium-titanium magnetite tailings. The results showed that the nutrient environment of vanadium-titanium magnetite tailings was significantly improved after GRSP was applied. The content of available phosphorus in vanadium-titanium magnetite tailings increased by 19. 7% ~ 60. 1% with EEG. TG effect was more significant, and the content of alkali-hydrolyzed nitrogen and available phosphorus increased by 12. 2% ~ 58. 9% and 44. 7% ~ 111. 3%,respectively. The increase of phosphoric acid is beneficial to enhance the precipitation of heavy metals. TG improve the stability of the aggregate structure of vanadium-titanium magnetite tailings,it can increase the proportion of large aggregates,the mean weight diameter and geometric mean diameter of vanadium-titanium magnetite tailings by 29. 36% ~ 114. 63%, 4. 76% ~ 15. 87% and 9. 26% ~ 16. 67%,respectively,which is beneficial to improve the retention capacity of vanadium-titanium magnetite tailings to heavy metals and nutrients. The effects of two GRSP forms on different heavy metals in vanadium-titanium magnet tailings are different,EEG can significantly reduce the availability of Cu,and the content of Cu extracted from DTPA decreases by 16. 7%;TG can passivate Cr,the content of Cr extracted from DTPA decreases by 72. 6%. In addition,the addition of sodium citrate inhibited the growth of alfalfa. Comprehensive analysis showed that the GRSP could change the availability of heavy metals and improve nutrient environment and aggregate structure in vanadium-titanium magnetite tailings,which could provide theoretical basis for ecological restoration in tailing areas.