Use of Monocalcium Phosphate Monohydrate for Chemical Immobilization of Heavy Metals Ions in Copper Smelting Slags

Year 2022, , 973 - 981, 19.09.2022

Mahamane Chapiou Souley Garba , Erol Kaya , Abdullah Seyrankaya , Fatih Turan

https://doi.org/10.21205/deufmd.2022247225

Abstract

Monocalcium phosphate monohydrate (MCPM) with chemical formula of Ca(H2PO4)2.H2O is a water-soluble and powerful agent for metal ion immobilization (removal) in soil and water. The use of MCPM can, therefore, be considered as an innovative and effective way to remove the leachable heavy metals from copper smelting slag. This study aims to (1) characterize copper smelting slag and perform the batch precipitation tests using MCPM, (2) analyze the treated copper smelting slag (residue) by x-ray diffraction (XRD) and (3) elucidate the mechanism of MCPM on leachable heavy metal removal from slag.
The experimental results demonstrated that MCPM effectively removes Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Sr and Zn metal ions from copper smelting slag under different MCPM concentrations and reaction times. In addition, the XRD analysis reveals the formation of insoluble metal phosphates such as Cd3(PO4)2, Cu2(PO4)2OH, Fe3(PO4)2, Mn3(PO4)2, Pb3(PO4)2 and Zn3(PO4)2 in the residue of copper smelting slag.

Keywords

Immobilization of heavy metals, Copper smelting slag, Characterization, Monocalcium phosphate monohydrate, Precipitation

Supporting Institution

Dokuz Eylül University Scientific Research Projects Coordination Council (BAP)

Project Number

FEN. 022 (201999)

Thanks

The authors are grateful for the financial support provided by Dokuz Eylül University Scientific Research Projects Coordination Council (BAP) with the project number 2020. KB. FEN. 022 (201999).

Use of Monocalcium Phosphate Monohydrate for Chemical Immobilization of Heavy Metals from Copper Smelting Slag

Abstract

Monocalcium phosphate monohydrate (MCPM) with chemical formula of Ca(H2PO4)2.H2O is a water-soluble and powerful agent for metal ions immobilization (removal) in soil and water. Therefore, the use of MCPM can be considered as an innovative and effective way to remove the leachable heavy metals from copper smelting slag. This study aims to (1) characterize copper smelting slag and perform the batch precipitation tests using MCPM, (2) analyze the treated copper smelting slag (residue) by x-ray diffraction (XRD) and (3) elucidate the mechanism of MCPM on leachable heavy metal removal from slag.
The experimental results demonstrated that MCPM removes effectively Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Sr and Zn metals ions from copper smelting slag under different MCPM concentrations and reaction times. In addition, the XRD analysis reveals the formation of insoluble metal phosphates such as Cd3(PO4)2, Cu2(PO4)2OH, Fe3(PO4)2, Mn3(PO4)2, Pb3(PO4)2 and Zn3(PO4)2 in the residue of copper smelting slag.

Kimyasal formülü Ca(H2PO4)2.H2O olan monokalsiyum fosfat monohidrat (MCPM), toprakta ve suda metal iyonlarını immobilize etmek için suda çözünebilen güçlü bir maddedir. Bu nedenle, MCPM kullanımı, bakır cürufundan çözünebilir ağır metallerin uzaklaştırılmasında yenilikçi ve etkili bir yol olarak düşünülebilir. Bu çalışmada; (1) bakır cürufunu karakterize etmek ve MCPM kullanarak bazı metallerin çökeltilmesini sağlamak, (2) metal uzaklaştırma (çökeltme) işleminden sonra elde edilen atığın x-ışını kırınımı (XRD) ile faz yapısını belirlemek, (3) cüruftan çözünebilir metal iyonların uzaklaştırılmasında MCPM mekanizmasının açıklanması amaçlanmıştır.
Deneysel sonuçlar, MCPM’nin farklı MCPM konsantrasyonları ve reaksiyon süreleri altında cüruf atığından Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Sr ve Zn metali iyonlarını etkin bir şekilde uzaklaştırdığını göstermiştir. Ayrıca, MCPM ile çöktürme işlemlerinden sonra elde edilen çökeltinin Cd3(PO4)2, Cu2(PO4)2OH, Fe3(PO4)2, Mn3(PO4)2, Pb3(PO4)2 ve Zn3(PO4)2 gibi çözünmeyen metal fosfat yapılarını içerdiği XRD analizleri ile tespit edilmiştir.

Keywords

Immobilization of heavy metals, Copper smelting slag, Characterization, Monocalcium phosphate monohydrate, Precipitation., Ağır metal immobilizasyonu, Bakır cürufu, Karakterizasyon, Monokalsiyum fosfat monohidrat, Çökeltme

Project Number

FEN. 022 (201999)

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