Preparation of high-strength ceramsite from red mud, fly ash, and bentonite

Mi, Hongcheng; Yi, Liang; Wu, Qian; Xia, Jin Lan; Zhang, Binghang

doi:10.1016/j.ceramint.2021.03.141

Cited by 95 publications

(27 citation statements)

References 51 publications

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“…The compressive strength increased from 4.45 MPa to 11.21 MPa when the sintering temperatures were increased from 1220 °C to 1250 °C and decreased from 1250 °C to 1270 °C. This is due to the incomplete reaction of the raw materials at 1220 °C, insufficient liquid phase formation, and low surface enamelization, resulting in a low compressive strength [ 37 ]. At a sintering temperature of 1250 °C, the amount of liquid phase increased; furthermore, at this surface tension and viscosity of the liquid phase, the gas pressure inside the ceramsite reached a dynamic balance [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2022

IJERPH

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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/cm3, 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.

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Section: Resultsmentioning

confidence: 99%

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

et al. 2022

IJERPH

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“…Red mud is mainly composed of oxides or hydroxides of aluminum, iron, calcium, and titanium, and fine particles of silica [5]. Due to its inherently high calcium and sodium hydroxide content, red mud is relatively toxic and has the potential to cause serious contamination [6]. The main mineral composition of Bayer red mud is desilication products (DSP) and residual minerals such as hematite and quartz in bauxite; the main component of sintered red mud is dolomite, with a mass fraction of 50% [7].…”

Section: Red Mud Overviewmentioning

confidence: 99%

Preparation of Ceramsite from Solid Waste

2022

JERR

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A large number of solid waste stockpiles produce pollution and harm to the atmosphere, soil, water bodies, and biosphere. Ceramic pellets are an emerging material with excellent performance and wide application. Ceramic pellets have many good properties, so they are widely researched and applied, especially in recent years, the research and application of ceramic pellets in construction projects are particularly prominent in the research process of industrial solid waste resourceization, which can not only consume a large amount of industrial solid waste, but also can achieve greater economic benefits. The characteristics, properties, classification of ceramic pellets, research and application status of ceramic pellets using industrial solid waste at home and abroad are reviewed.

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“…The preparation of ceramsite from solid waste has been extensively researched. Mi, H et al [ 10 ] prepared high-strength ceramsite from red mud, fly ash, and bentonite, which exhibited high compressive strength, low water absorption, and effective solidification. Moreover, the raw material weight ratio and sintering conditions, including sintering temperature, sintering time, preheating temperature, and preheating time were investigated.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Lightweight Ceramsite from Solid Waste Using SiC as a Foaming Agent

Shang

Fan

et al. 2022

Materials

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SiC was chosen as the foaming agent, and river bottom silt, waste oil sludge, paint bucket slag, and fly ash were used as raw materials, to prepare lightweight ceramsite without adding any chemical additives. The effects of SiC dosing and sintering temperature on various properties of the ceramsite were studied, and the pore-forming mechanism of the lightweight ceramsite was clarified by thermal analysis and X-ray diffraction analysis. The results showed that the single ceramsite compressive strength, water absorption, bulk density, and porosity of ceramsite sintered at 1180 °C with 1.0% SiC were 2.15 MPa, 2.02%, 490 kg/m3, and 23.85%, respectively. The major mineralogical compositions were quartz, fayalite, and kyanite, with small amounts of albite-low from 1140 to 1190 °C. Furthermore, the concentration of all tested heavy metals from ceramsite was lower than the maximum allowable concentration of the leaching solution specified in the Chinese national standard (GB 5085.3-2007), which reveals that this solid waste ceramsite will not cause secondary environmental pollution. The prepared ceramsite, exhibiting lower bulk density, high water absorption and porosity, and effective solidification of deleterious elements, can be used to prepare green lightweight aggregate concrete. Importantly, preparation of solid waste ceramsite is an effective way to dispose of hazardous wastes.

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Preparation of high-strength ceramsite from red mud, fly ash, and bentonite

Cited by 95 publications

References 51 publications

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

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

Preparation of Ceramsite from Solid Waste

Preparation of Lightweight Ceramsite from Solid Waste Using SiC as a Foaming Agent

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