Effect of calcium compounds on lightweight aggregates prepared by firing a mixture of coal fly ash and waste glass

Wei, Yu‐Ling; Cheng, Shao-Hsian; Ou, Kun-Tein; Kuo, Po-Jan; Chung, Tai-Heng; Xie, Xiang-Qi

doi:10.1016/j.ceramint.2017.08.110

Cited by 39 publications

(9 citation statements)

References 32 publications

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“…Its further development to replace traditional building materials is economically beneficial. Recently, the Chinese government introduced policies to restrict the mining of conventional ceramsite raw materials, such as shale and clay [ 10 ]. Thus, it is an urgent issue to find new materials to replace the original ceramsite raw materials in order to achieve the purpose of sustainable development.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…However, with the growing concerns about sustainability, a wide range of urban and industrial waste types have been tested for their ability to partially or completely replace conventional raw materials for LWA production. These unconventional raw materials include ground granulated blast furnace slag [ 9 ], fly ash [ 10 ], incinerated ash [ 11 , 12 , 13 , 14 ], waste glass [ 15 ], sewage sludge [ 16 , 17 , 18 , 19 ], screen glass and polishing sludge [ 20 ], reservoir sediments [ 21 , 22 ], waste TFT-LCD glass powder and reservoir sediments [ 23 ], tile grinding sludge with reservoir sediments [ 24 ], waste drill cuttings [ 25 ], coal fly ash and waste glass [ 26 ], stone cutting sludge, plastic wastes, and sepiolite rejections [ 27 ], and clays and alternative raw materials [ 28 ]. Generally speaking, synthetic aggregates with a bulk density of 0.88–1.12 g/cm 3 can be used as structural concrete; aggregates with a bulk density of less than 0.88 g/cm 3 are mostly used to make thermal insulation elements.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Use of Sludge from Industrial Park Wastewater Treatment Plants in Manufacturing Lightweight Aggregates

Tang

Cheng

2022

Materials

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The aim of this study was to investigate the development of a process for manufacturing lightweight aggregates (LWAs) by incorporating sludge from wastewater treatment plants in industrial parks with reservoir sediments. The research was divided into two stages: laboratory-scale firing and large-scale firing. In the laboratory-scale stage, a high-temperature furnace was used for trial firing. In the large-scale stage, a commercial rotary kiln was used for trial firing for mass production. The test results showed that the water absorption, dry loose bulk density, and crushing strength of the sintered LWAs were 14.2–26.9%, 634–753 kg/m3, and 1.29–2.90 MPa, respectively. Moreover, the water absorption of the sintered LWAs increased as the percentage of added sludge increased. In addition, the dry loose bulk density of the sintered LWAs gradually decreased as the percentage of added sludge increased. Moreover, the results of the heavy metal toxicity characteristic leaching procedure (TCLP) dissolution test for the LWAs produced by blending 30–50% sludge were all lower than the standard value required by the Taiwan Environmental Protection Agency for general industrial waste. The strength grade of the sintered LWAs was 20 MPa. From this point of view, the sintered LWAs that were studied under the test conditions could be used as aggregates for lightweight concrete and would allow it to have a reasonable strength of greater than 20 MPa.

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“…They observed that the bloating mechanism occurred at the core of the LWA that was sintered at 1150°C and was associated with the release of SO 2 , SO 3 and O 2 gases due to the decomposition of FeSO 4 . Wei et al 33 investigated the effect of calcium compounds, including calcite and gypsum (CaSO 4 .2H 2 O) additions, as bloating agents on LWA pore formation in coal fly ash mixed with waste glass. Their thermogravimetric analysis (TGA) results on pure calcite demonstrated a rapid mass loss from 600°C to 780°C and relatively no mass loss from 780°C to 1200°C.…”

Section: Introductionmentioning

confidence: 99%

Thermochemical principles of the production of lightweight aggregates from waste coal bottom ash

et al. 2020

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Manufacturing lightweight aggregate (LWA) (ie, porous ceramics) by means of a sintering technique requires a delicate balance among three conditions: (a) forming a sufficient amount of molten liquid phase during sintering, (b) reaching an appropriate viscosity for solid-liquid suspension, and (c) emitting a sufficient amount of gas that can be entrapped by the liquid phase to form pores. This study evaluates these three F I G U R E 1 Schematic representation of a synthetic lightweight aggregate with core and shell morphology 7,18

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Effect of calcium compounds on lightweight aggregates prepared by firing a mixture of coal fly ash and waste glass

Cited by 39 publications

References 32 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

Sustainable Use of Sludge from Industrial Park Wastewater Treatment Plants in Manufacturing Lightweight Aggregates

Thermochemical principles of the production of lightweight aggregates from waste coal bottom ash

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