Preparation of ceramsite from lead-zinc tailings and coal gangue: Physical properties and solidification of heavy metals

Luo, Zhenmin; Guo, Jinyang; Liu, Xiaohai; Mu, Yuandong; Zhang, Meixiang; Zhang, Meng; Tian, Chongfei; Ou, Jiahui; Mi, Jie

doi:10.1016/j.conbuildmat.2023.130426

Cited by 21 publications

(1 citation statement)

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“…Si, Al, and other elements contained in lead-zinc tailings are essential components of building materials production [24,25]. Therefore, if lead-zinc tailings can be used as a substitute for building materials, this can solve the problem of tailings storage and maximize the effective utilization of resources [26,27]. In recent years, many scholars have carried out research on the use of lead-zinc tailings as raw materials to fabricate building materials.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Lead–Zinc Tailings Sintered Brick and Its Effect Factors Based on an Orthogonal Experiment

Lin,

Li,

2024

Materials

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The existence of lead-zinc tailings threatens the social and ecological environment. The recycling of lead–zinc tailings is important for the all-round green transformation of economic society. In this study, the possibility of fabricating sintered ordinary bricks with lead–zinc tailings was studied based on orthogonal experimentation, and the phase composition and micromorphology of sintered products were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). With lead–zinc tailings as the main material, and clay and fly ash as additives, the effect of clay content, forming pressure, sintering temperature, and holding time on physical properties of sintered bricks was analyzed. The results show that clay content and sintering temperature have a major effect on compressive strength, while sintering temperature and holding time play an important role in water absorption. During sintering, mica, chlorite, and other components in lead–zinc tailings are decomposed to form albite, hematite, maghemite, and anhydrite, which play a role in the strength of bricks. The optimal process parameters were found to be a ratio of lead–zinc tailings:clay:fly ash = 6:3:1, forming pressure of 20 MPa, firing temperature of 1080 °C, and holding time of 60 min. The corresponding compressive strength and water absorption were 34.94 MPa and 16.02%, which meets the Chinese sintered ordinary bricks standard (GB/T 5101-2017).

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