Coprocessing of Stainless-Steel Pickling Sludge with Laterite Ore via Rotary Kiln-Electric Furnace Route: Enhanced Desulfurization and Metal Recovery

Li, Guanghui; Wang, Jian; Rao, Mingjun; Zhang, Xin; You, Jingxiang; Peng, Zhiwei; Jiang, Tao

doi:10.1016/j.psep.2020.06.014

Cited by 20 publications

(7 citation statements)

References 27 publications

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“… Figure 3 b shows that the moisture content of the samples ranges from 45.47% to 83.34%, which mainly includes free water and a small amount of bound water. 65 The different water contents of the SHPS samples may be related to the steel pickling process, HPWL treatment process, and types and use of filter presses in the various enterprises. At present, SHPS dewatering is generally conducted with plate-and-frame filters, while a few enterprises use belt-filter presses for dewatering.…”

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

“…Excessive addition of a neutralizer will cause a large amount of neutralizer to be wrapped by other flocs and then sink in the sludge without participating in the reaction, resulting in a large sludge yield. Therefore, the dose of neutralizer should be controlled during neutralization. Figure b shows that the moisture content of the samples ranges from 45.47% to 83.34%, which mainly includes free water and a small amount of bound water . The different water contents of the SHPS samples may be related to the steel pickling process, HPWL treatment process, and types and use of filter presses in the various enterprises.…”

Section: Results and Discussionmentioning

confidence: 99%

“…No nickel-, manganese-, or chromium-containing phases are observed in the XRD patterns because of the poor crystallization of their hydroxides; additionally, their contents in SHPS are too low to be detected. 70 As listed in Table 3, Fe and Zn are mainly present in complex oxides. This state of existence is mainly due to the dehydration of the hydroxides of Fe and Zn during the drying process of wet sludge, which generates their corresponding metal oxides.…”

Section: Resultsmentioning

confidence: 99%

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Composition and Leaching Toxicity of Hydrochloric Acid Pickling Sludge Generated from the Hot-Dip Galvanized Steel Industry

Zhang

Shu

et al. 2022

ACS Omega

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Steel hydrochloric acid pickling sludge (SHPS), containing the heavy metals Fe, Zn, and Ni and a high chloride salt content, is considered a type of hazardous solid waste because of its potential harm to human health and the environment. In addition, the SHPS yield is large, but the main treatment currently used is only safe for landfills. Although studying the composition and leaching toxicity of SHPS is of great importance, only a small amount of related literature is available. This paper can help compensate for this deficiency. SHPS is analyzed from the aspects of its formation mechanism, pH, moisture content, elemental concentration, phase composition, microstructure, and leaching toxicity. The results show that its pH ranges from 2.25 to 11.11, and the moisture content ranges from 45.47% to 83.34%. Additionally, the concentration of Fe is the highest, with values from 29.80% to 50.65%, while other alkali metal elements, namely, Ca, K, and Na, have values of 0.36% to 23.07%, 0.02% to 19.82%, and 0.38% to 3.31%, respectively. Heavy metal elements, namely, Zn, Ni, Mn, Cr, and Pb, have values of 0.02% to 14.88%, 0.001% to 0.05%, 0.03% to 0.38%, 0.01% to 0.09%, and 0.02% to 0.19%, respectively. Anions, namely, SO 4 2– , Cl – , F – , and NO 3 – , have contents of 0.09% to 0.34%, 0.54% to 5.73%, 0.001% to 0.04%, and 0.01% to 0.15%, respectively. X-ray diffraction (XRD) analysis shows that Fe and Zn are mainly present in oxides, Ca is present as CaO and CaCO 3 , and chlorine is present in NaCl. Moreover, scanning electron microscopy (SEM) analysis shows that the microscopic structure consists mainly of bright and fluffy irregular spheres; stripes; flakes; and dark, very small irregular particles. The leaching toxicity test based on HJ/T 299-2007 (China) was performed, where SHPS samples were treated with a mixed solution of sulfuric acid, nitric acid, and pure water (pH = 3.20 ± 0.05) at a liquid-to-solid ratio of 10:1 for a period of 18 h. The leachate was filtered and analyzed for Cr, Ni, Mn, Zn, etc. The leaching results indicate that Zn and Ni are the main elements that cause SHPS to be hazardous to the environment. These research results can provide a reference for later researchers studying the effective treatment of SHPS, such as more effective treatments for reducing toxicity and resource utilization.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Composition and Leaching Toxicity of Hydrochloric Acid Pickling Sludge Generated from the Hot-Dip Galvanized Steel Industry

Zhang

Shu

et al. 2022

ACS Omega

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“…The microstructure of the corncob shown in Figure 4 a consists of long strips embedded with pores, and this structure is conducive to the release of volatile compounds during pyrolysis. As shown in Figure 4 b, SHPS has a microscopic structure consisting of bright and fluffy irregular spheres and dark and very small irregular particles, 18 and the structure of the sludge is complicated.…”

Section: Methodsmentioning

confidence: 99%

Reduction–Magnetic Separation of Pickling Sludge by Biomass Pyrolysis Reducing Gas

Shu

Wang

et al. 2022

ACS Omega

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The neutralization process of carbon steel pickling wastewater produces a large amount of steel hydrochloric acid pickling sludge (SHPS), and improper treatment of this sludge poses a serious threat to the environment. Considering that SHPS contains a large amount of iron oxide and given the huge demand for iron concentrate in China’s ironmaking industry, refining iron oxide in SHPS into iron concentrate will have great environmental and economic benefits. This paper proposes a new method that uses biomass (corncob) to replace conventional coal-based reductants for the recovery of iron components in SHPS to simultaneously utilize two kinds of solid waste resources. Factors that affect the iron recovery rate and iron grade of SHPS, such as the reaction temperature, corncob dosage, residence time, and magnetic field strength, were studied using a fixed bed and a magnetic separator. These studies were combined with thermodynamic analysis, thermogravimetric analysis, X-ray diffraction, inductively coupled plasma–mass spectrometry, gas chromatography, etc. The results showed that when the reaction temperature was 680 °C, the corncob dosage was 5%, the residence time was 20 min, and the magnetic field strength was 200 mT, the recovery rate of iron reached 91.83%, and the iron grade of the recovered products was 67.72%, meeting the level I requirements in GB/T 32545-2016. Based on this result, a process involving SHPS reduction roasting with corncob pyrolysis reducing gas–magnetic separation was established to recover iron from SHPS. This process not only effectively utilizes the iron oxide in SHPS by converting it into iron concentrate powder for the ironmaking industry but also proves that the pyrolysis gas of corncob has good reduction ability.

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Characterization of Slag and Growth of Ferronickel Grains During Smelting of Nickel Laterite Ore

Zhao

Zhou

et al. 2022

Characterization of Minerals, Metals, and Materials 2022

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Coprocessing of Stainless-Steel Pickling Sludge with Laterite Ore via Rotary Kiln-Electric Furnace Route: Enhanced Desulfurization and Metal Recovery

Cited by 20 publications

References 27 publications

Composition and Leaching Toxicity of Hydrochloric Acid Pickling Sludge Generated from the Hot-Dip Galvanized Steel Industry

Composition and Leaching Toxicity of Hydrochloric Acid Pickling Sludge Generated from the Hot-Dip Galvanized Steel Industry

Reduction–Magnetic Separation of Pickling Sludge by Biomass Pyrolysis Reducing Gas

Characterization of Slag and Growth of Ferronickel Grains During Smelting of Nickel Laterite Ore

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