Study on the Properties and Heavy Metal Solidification Characteristics of Sintered Ceramsites Composed of Magnesite Tailings, Sewage Sludge, and Coal Gangue

Yanlong Li (), Mingyuan Xu, Quan Li, Anjun Gai, Tianhua Yang and Rundong Li ()
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Yanlong Li: The Key Laboratory of Clean Energy in Liaoning Province, College of Energy and Environment, Shenyang Aerospace University, Shenyang 110136, China
Mingyuan Xu: The Key Laboratory of Clean Energy in Liaoning Province, College of Energy and Environment, Shenyang Aerospace University, Shenyang 110136, China
Quan Li: The Key Laboratory of Clean Energy in Liaoning Province, College of Energy and Environment, Shenyang Aerospace University, Shenyang 110136, China
Anjun Gai: The Key Laboratory of Clean Energy in Liaoning Province, College of Energy and Environment, Shenyang Aerospace University, Shenyang 110136, China
Tianhua Yang: The Key Laboratory of Clean Energy in Liaoning Province, College of Energy and Environment, Shenyang Aerospace University, Shenyang 110136, China
Rundong Li: The Key Laboratory of Clean Energy in Liaoning Province, College of Energy and Environment, Shenyang Aerospace University, Shenyang 110136, China

IJERPH, 2022, vol. 19, issue 17, 1-14

Abstract: With the rapid development of industry, the disposal of industrial solid waste needs to be solved urgently in China. Thus, an effective disposal method should be proposed to recycle these solid wastes in an environmentally friendly and sustainable manner. In this paper, ceramsite was prepared from sewage sludge (SS), magnesite tailings (MTs), and coal gangue (CG). The influence of the material ratio and sintering temperature on the properties of the ceramsite was investigated. The results show that the ceramsite had better properties when the following parameters were used: a ratio of SS: CG: MT of 4.5:4:1.5; a sintering temperature of 1250 °C; a compressive strength of 11.2 MPa (or it can be rounded to 11; our major remark relates to significant figures, and they should be up to 2–3 figures, according to measurement errors); a water absorption of 3.54%; and apparent and bulk densities of 1.19 and 0.81 g/cm 3 , respectively. The strength was superior to more than twice the 900-density grade prescribed by the Chinese national standard. After sintering, most of the heavy metals in the ceramsite mainly existed in the form of residue state (FD), meaning that they were highly stable. The leaching concentrations of Zn and Ni from the ceramsite were 0.72 and 0.25 mg/L lower than the prescribed regulatory limits (2.0 and 0.1 mg/L). The overall pollution toxicity index (OPTI) was only 240, less than that of raw pellets, indicating that the environmental risk is low. Not only did the ceramsite, prepared from SS, CG, and MT, exhibit excellent chemical properties, but it also proved to be an environmentally safe material. Therefore, it is an effective approach to realize the collaborative treatment of SS, CG, and MT by preparing ceramsite.

Keywords: magnesite tailings; sewage sludge; ceramsite; heavy metals; OPTI evaluation (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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