Investigative studies for inert transformation of toxic chrysotile tailing

Zhu, Ping; Wang, L. Y.; Du, Hong; Zhou, Ming; Zhou, Jinghong

doi:10.1007/s10163-012-0093-6

Cited by 12 publications

(6 citation statements)

References 29 publications

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“…It can be observed that, at 1100 °C, they contain forsterite (64%), Fe-rich enstatite (28%) (PDF 01-071-1163), hematite (4%) (PDF 01-089-0599) and α-alumina (4%), but, in agreement with the results of other researchers [43,44,45], at higher temperatures alumina reacts with forsterite to form the MgOAl 2 O 3 spinel phase (PDF 01-075-1798) which raises from 10%, after a thermal treatment at 1200 °C, to 15% after a thermal treatment at 1300 °C. Conversely, the quantity of forsterite decreases from 64% to 60% and enstatite from 28% to 25%.…”

Section: Resultssupporting

confidence: 91%

Sintering Behaviour of Waste Olivine and Olivine/Alumina Blends

2014

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The sintering behaviour of several green compacts made with olivine or olivine/alumina powder blends has been examined. To this goal, powders were attrition milled, uniaxially pressed into specimens and air sintered at temperatures ranging from 1100 to 1300 °C. The resulting samples were characterized by water absorption, shrinkage, phase composition and density. Compositions containing 5%, 10% and 20% Al2O3 have a sintering behaviour similar to that of olivine alone, reaching low residual porosity when fired at 1300 °C. Conversely, the composition containing 40% Al2O3 displays an almost flat shrinkage profile and maintains high residual porosity in the examined temperature range.

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Section: Resultssupporting

confidence: 91%

Sintering Behaviour of Waste Olivine and Olivine/Alumina Blends

2014

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“…In this case lower water absorption was obtained in comparison to the reference material (2.7 vs. 3.3 %). Also, the value of open porosity was the lowest [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] MPa, thus the standard requirements are fulfilled. It should be noted that the addition of 10 wt% of cement-asbestos did not reduce the compressive strength of ceramic material as compared to the sample with 5 wt% of this waste.…”

Section: Recycling Of the Transformation Product In Clinker Brick MIXmentioning

confidence: 99%

“…The last method is most commonly presented in the specialist literature [19][20][21][22] because of its simplicity in implementation and potentially wide range of proposed applications of the obtained product after thermal treatment, e.g. as secondary ceramic raw material [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Utilisation of cement-asbestos wastes by thermal treatment and the potential possibility use of obtained product for the clinker bricks manufacture

et al. 2015

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The aim of this study was to investigate the thermal behaviour of cement-asbestos wastes and to determine whether it is possible to use them in the production of building ceramics, e.g. clinker bricks. In the first part of the research, the process of cement-asbestos thermal decomposition was studied. This asbestos material contained the chrysotile and crocidolite variety of asbestos. The results of this study allowed to determine the lowest temperature of thermal treatment that provides asbestos detoxification. The second part of the paper presents the results of a preliminary study on using previously calcined cement-asbestos wastes as an additive to ceramic masses typical for clinker bricks. Green compacts containing various amounts of cement-asbestos wastes were sintered and then ceramic properties were determined. The results of the study indicate that calcined asbestos-containing materials can be used as one of the secondary raw materials in the production of clinker ceramics.

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“…Several technologies such as encapsulation, thermal and thermochemical methods, and chemical methods have been conducted in order to detoxify asbestos 7‐12 . The encapsulation method is a method of preventing asbestos from flowing into the atmosphere by forming an impermeable layer without dismantling the asbestos with a relatively low cost.…”

Section: Introductionmentioning

confidence: 99%

Detoxification of Asbestos and Recovery of Valuable Metals from Detoxified Asbestos

Hong

Choi²,

Yoon

et al. 2021

Bulletin Korean Chem Soc

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Studies on detoxification of asbestos and recovery of valuable metals from detoxified asbestos were conducted. First, asbestos was detoxified by a microwave heat treatment that used silicon carbide balls, which are inorganic heating elements that absorb microwaves and release heat at room temperature. For efficient heat treatment, the asbestos containing waste (ACW) was powdered by crushing and grinding processes and then a detoxification heat treatment was performed. Microwave heat treatment temperature and time variables were adjusted to investigate the detoxification properties according to heat treatment conditions. After heat treatment, treated ACW was analyzed for detoxification properties through crystal structure and microstructure analysis using X‐ray diffraction (XRD) and scanning electron microscopy. Complete asbestos detoxification was confirmed when the microwave heat treatment was performed at 1200°C for over 60 min and at 1300°C for over 10 min. Second, recovery of valuable metals from detoxified asbestos was carried out. The main components, Si, Ca, and Mg, of detoxified asbestos‐containing waste (DACW) were separated and recovered in the form of SiO2, CaSO4, and Mg(OH)2. SiO2 was separated first after treatment of DACW with HCl. Ca in the form of sulfate, CaSO4, was recovered when subsequent treatment of remaining aqueous acid solution with H2SO4. The remaining Mg was recovered by precipitation as Mg(OH)2 form under strong basic conditions. Each separated component was confirmed by XRD and Inductively Coupled Plasma (ICP) analysis.

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Investigative studies for inert transformation of toxic chrysotile tailing

Cited by 12 publications

References 29 publications

Sintering Behaviour of Waste Olivine and Olivine/Alumina Blends

Sintering Behaviour of Waste Olivine and Olivine/Alumina Blends

Utilisation of cement-asbestos wastes by thermal treatment and the potential possibility use of obtained product for the clinker bricks manufacture

Detoxification of Asbestos and Recovery of Valuable Metals from Detoxified Asbestos

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