New technology for recyclingmaterials from oily cold rollingmill sludge

Abstract

Oily cold rolling mill (CRM) sludge is one of metallurgical industry solid wastes. The recycle of these wastes can not only protect the environment but also permit their reutilization. In this research, a new process of “hydrometallurgical treatment + hydrothermal synthesis” was investigated for the combined recovery of iron and organic materials from oily CRM sludge. Hydrometallurgical treatment, mainly including acid leaching, centrifugal separation, neutralization reaction, oxidizing, and preparation of hydrothermal reaction precursor, was first utilized for processing the sludge. Then, micaceous iron oxide (MIO) pigment powders were prepared through hydrothermal reaction of the obtained precursor in alkaline media. The separated organic materials can be used for fuel or chemical feedstock. The quality of the prepared MIO pigments is in accordance with the standards of MIO pigments for paints (ISO 10601-2007). This clean, effective, and economical technology offers a new way to recycle oily CRM sludge.

Keywords

cold rolling mills / sludge disposal / hydrometallurgy / hydrothermal synthesis / recycling / waste utilization

References

[1] Li C, Sun HH, Bai J, Li LT. Innovative methodology for comprehensive utilization of iron ore tailings: Part 1. The recovery of iron from iron ore tailings using magnetic separation after magnetizing roasting. J. Hazard. Mater., 2010, 174(1–3): 71.

[2] Sun YS, Han YX, Gao P, Wang ZH, Ren DZ. Recovery of iron from high phosphorus oolitic iron ore using coal-based reduction followed by magnetic separation. Int. J. Miner. Metall. Mater., 2013, 20(5): 411.

[3] Zhang YL, Li HM, Yu XJ. Recovery of iron from cyanide tailings with reduction roasting-water leaching followed by magnetic separation. J. Hazard. Mater., 2012, 213–214, 167.

[4] Jayasankar K, Ray PK, Chaubey AK, Padhi A, Satapathy BK, Mukherjee PS. Production of pig iron from red mud waste fines using thermal plasma technology. Int. J. Miner. Metall. Mater., 2012, 19(8): 679.

[5] Yi ZL, Sun HH, Wei XQ, Li C. Iron ore tailings used for the preparation of cementitious material by compound thermal activation. Int. J. Miner. Metall. Mater., 2009, 16(3): 355.

[6] Das B, Prakash S, Reddy PSR, Misra VN. An overview of utilization of slag and sludge from steel industries. Resour. Conserv. Recycl., 2007, 50(1): 40.

[7] Park JW, Ahn JC, Song H, Park K, Shin H, Ahn JS. Reduction characteristics of oily hot rolling mill sludge by direct reduced iron method. Resour. Conserv. Recycl., 2002, 34(2): 129.

[8] Shatokha VI, Gogenko OO, Kripak SM. Utilising of the oiled rolling mills scale in iron ore sintering process. Resour. Conserv. Recycl., 2011, 55(4): 435.

[9] Kamali H, Ghaziaskar HS, Khakshour A, Kaboudvand M. Supercritical CO₂ extraction of phthalic anhydride, benzoic acid and maleic acid from petrochemical wastes. J. Supercrit. Fluids, 2013, 74, 46.

[10] Cui BC, Cui FY, Jing GL, Xu SL, Huo WJ, Liu SZ. Oxidation of oily sludge in supercritical water. J. Hazard. Mater., 2009, 165(1–3): 511.

[11] Chang JI, Lin JJ, Huang JS, Chang YM. Recycling oil and steel from grinding swarf. Resour. Conserv. Recycl., 2006, 49(2): 191.

[12] Ruffino B, Zanetti MC. Recycling of steel from grinding scraps: reclamation plant design and cost analysis. Resour. Conserv. Recycl., 2008, 52(11): 1315.

[13] Mrayyan B, Battikhi MN. Biodegradation of total organic carbons (TOC) in Jordanian petroleum sludge. J. Hazard. Mater., 2005, 120(1–3): 127.

[14] Eun HC, Yang HC, Cho YZ, Lee HS, Kim IT. Vacuum distillation of a mixture of LiCl-KCl eutectic salts and RE oxidative precipitates and a dechlorination and oxidation of RE oxychlorides. J. Hazard. Mater., 2008, 160(2–3): 634.

[15] Zhou YH, Wu WB, Qiu KQ. Recovery of materials from waste printed circuit boards by vacuum pyrolysis and vacuum centrifugal separation. Waste Manage., 2010, 30(11): 2299.

[16] Lin KH, Hsu HT, Ko YW, Shieh ZX, Chiang HL. Pyrolytic product characteristics of biosludge from the wastewater treatment plant of a petrochemical industry. J. Hazard. Mater., 2009, 171(1–3): 208.

[17] Tohidifar MR, Taheri-Nassaj E, Alizadeh P. Optimization of the synthesis of a nano-sized mica-hematite pearlescent pigment. Mater. Chem. Phys., 2008, 109(1): 137.

[18] Liu ZC, Zheng YJ. Micaceous iron oxide prepared from pyrite cinders by hydrothermal method. J. Cent. South Univ. Technol., 2011, 18(1): 89.

[19] Peng DF, Beysen S, Li Q, Sun YF, Yang LY. Hydrothermal synthesis of monodisperse α-Fe2O3 hexagonal platelets. Particuology, 2010, 8(4): 386.

[20] Zheng YJ, Liu ZC. Preparation of monodispersed micaceous iron oxide pigment from pyrite cinders. Powder Technol., 2011, 207(1–3): 335.

[21] Jiao H, Jiao GS. Hydrothermal synthesis and characterization of monodisperse α-Fe2O3 nanoparticles. Mater. Lett., 2009, 63(30): 2725.

[22] Otake T, Wesolowski DJ, Anovitz LM, Allard LF, Ohmoto H. Mechanisms of iron oxide transformations in hydrothermal systems. Geochim. Cosmochim. Acta, 2010, 74(21): 6141.

[23] Krehula S, Musić S, Skoko Popović S. The influence of Zn-dopant on the precipitation of α-FeOOH in highly alkaline media. J. Alloys Compd., 2006, 420(1–2): 260.

[24] Krehula S, Musić S. The influence of a Cr-dopant on the properties of α-FeOOH particles precipitated in highly alkaline media. J. Alloys Compd., 2009, 469(1–2): 336.

[25] Das S, Hendry MJ, Essilfie-Dughan J. Transformation of two-line ferrihydrite to goethite and hematite as a function of pH and temperature. Environ. Sci. Technol., 2011, 45(1): 268.