Application of electrolytic manganese residues in cement products through pozzolanic activity motivation and calcination

Wang, Fan; Long, Guangcheng; Bai, Min; Wang, Jilin; Zhou, John L.; Zhou, Xiaohua

doi:10.1016/j.jclepro.2022.130629

Cited by 58 publications

(4 citation statements)

References 45 publications

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“…In addition, DMR is obtained by desulfurization and deamination calcination of EMR at high temperature and pressure. It is mainly a solid calcined slag with low-temperature inert phases such as cristobalite, calcium sulfate, and silicates such as calcium and aluminum as main phases and has high activity [35]. In addition, DMR itself has weak volcanism and promotes the hydration reaction of cement [36].…”

Section: Flexural Strength and Compressive Strengthmentioning

confidence: 99%

Study on the Performance and Mechanism of Cement Solidified Desulfurization Manganese Residue

Wang

Che

et al. 2023

Materials

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Desulfurized manganese residue (DMR) is an industrial solid residue produced by high-temperature and high-pressure desulfurization calcination of electrolytic manganese residue (EMR). DMR not only occupies land resources but also easily causes heavy metal pollution in soil, surface water, and groundwater. Therefore, it is necessary to treat the DMR safely and effectively so that it can be used as a resource. In this paper, Ordinary Portland cement (P.O 42.5) was used as a curing agent to treat DMR harmlessly. The effects of cement content and DMR particle size on flexural strength, compressive strength, and leaching toxicity of a cement-DMR solidified body were studied. The phase composition and microscopic morphology of the solidified body were analyzed by XRD, SEM, and EDS, and the mechanism of cement-DMR solidification was discussed. The results show that the flexural strength and compressive strength of a cement-DMR solidified body can be significantly improved by increasing the cement content to 80 mesh particle size. When the cement content is 30%, the DMR particle size has a great influence on the strength of the solidified body. When the DMR particle size is 4 mesh, the DMR particles will form stress concentration points in the solidified body and reduce its strength. In the DMR leaching solution, the leaching concentration of Mn is 2.8 mg/L, and the solidification rate of Mn in the cement-DMR solidified body with 10% cement content can reach 99.8%. The results of XRD, SEM, and EDS showed that quartz (SiO2) and gypsum dihydrate (CaSO4·2H2O) were the main phases in the raw slag. Quartz and gypsum dihydrate could form ettringite (AFt) in the alkaline environment provided by cement. Mn was finally solidified by MnO2, and Mn could be solidified in C-S-H gel by isomorphic replacement.

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Section: Flexural Strength and Compressive Strengthmentioning

confidence: 99%

Study on the Performance and Mechanism of Cement Solidified Desulfurization Manganese Residue

Wang

Che

et al. 2023

Materials

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“…Manganese tailing stone is a stone with low manganese content screened out from manganese ore at the early stage of mining. Relevant data show that every 1 ton of manganese metal produced can produce 10-13 tons of electrolytic manganese residue and 21-23 tons of manganese tailing stone [15,16]. Therefore, with the continuous production of manganese metal, more and more electrolytic manganese residue and manganese tailing stone are produced.…”

Section: Introductionmentioning

confidence: 99%

Properties and Microstructural Characteristics of Manganese Tailing Sand Concrete

2022

Self Cite

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In this work, manganese tailing sand concrete (MTSC) was prepared using manganese tailing sand (MTS) in replacement of river sand (RS) to alleviate the shortage of RS resources and achieve clean treatment and high-value resource utilization of manganese tailing stone. The effects of MTS content on the slump, mechanical strength, air void characteristics, hydration products and micromorphology of MTSC were studied experimentally. The leaching risk of harmful substances in MTSC was also explored by testing the concentration of Mn2+. The results show that the utilization of MTS reduces the slump of MTSC to a certain extent. When the MTS content is lower than 40%, the gypsum introduced by MTS and C3A in cement undergoes a hydration reaction to form ettringite, which decreases the number of pores with a diameter less than 0.1 mm and promotes strength development in MTSC. Additionally, when the MTS content exceeds 40%, the large amount of gypsum reacts to form more ettringite. The expansive stress generated by the ettringite severely damages the pore structure, which is not conducive to the mechanical properties of MTSC. In addition, the leaching of hazardous substances in MTSC is insignificant, and the incorporation of cement can effectively reduce the risk of leaching hazardous substances in MTSC. In summary, it is completely feasible to use MTS to replace RS for concrete preparation when the substitution rate of MTS is less than 40%, with no risk of environmental pollution. The results and adaptation in the concrete industry can reduce the carbon footprint, which is in line with the current trend in civil and materials engineering.

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“…Bioleaching is an efficient extraction method, and its rate of Mn in EMR can be as high as 99.7% using sulfur oxygen and ferric oxygen bacteria 8,9 . The calcined EMR has hydration activity and gelation 10,11 . Gel materials prepared by adding cement, lime, and other materials to EMR can absorb soluble harmful substances in EMR, with a compressive strength of 18.85 MPa, and the stability efficiency of NH 4+ and Mn 2+ can achieve more than 95% 12 .…”

Section: Introductionmentioning

confidence: 99%

“…8,9 The calcined EMR has hydration activity and gelation. 10,11 Gel materials prepared by adding cement, lime, and other materials to EMR can absorb soluble harmful substances in EMR, with a compressive strength of 18.85 MPa, and the stability efficiency of NH 4+ and Mn 2+ can achieve more than 95%. 12 Adding waste glass, dolomite and kaolin to EMR and using sawdust and toner as a foaming agent can be used for firing porous ceramics.…”

Section: Introductionmentioning

confidence: 99%

Effects of electrolytic manganese residue (EMR) to co‐sintering mechanism of ceramic aggregate

Dongdong

et al. 2022

Int J Applied Ceramic Tech

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The influences of co-sintering temperature on the physical properties of EMR (electrolytic manganese residue) ceramic aggregate were investigated over the gradient of co-sintering by EMR, CFA (coal fly ash), and P (perlite) that were used as raw materials. Seven EMR samples were prepared to sinter at different temperatures that were decided by the data of a thermal mass spectrometer, and four ceramic aggregate embryos were sintered at 1120, 1140, 1160, and 1180 • C. The mechanisms of co-sintering temperature action on performance were determined by means of X-ray diffraction and scanning electron microscopy with energy-dispersive X-ray spectroscopy. The optimal temperature of 1160 • C and the temperature increment lead to an enhancement of cylinder compressive strength and a damping of 1-h water absorption, softening coefficient, and grain shape coefficient was discovered. Gypsum of EMR dissolved and exhausted gas during co-sintering resulted in CaO. The crystalline transformation of wollastonite and gehlenite produced anorthite, which boosts the strength of aggregate and the content of anorthite, was proportional to the co-sintering temperature and the pressure strength of cylinder. The liquid phase of "overfiring"-coated crystal contributed to the further improvement of strength, but the aggregate sphere deformation generated a reduction of comprehensive performance. The formation of bustamite calcian in co-sintered ceramic aggregate realized the solidification of Mn, and the solidification rate of leaching toxicity test was 99.92%, and the absence of radioactivity was demonstrated.

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Application of electrolytic manganese residues in cement products through pozzolanic activity motivation and calcination

Cited by 58 publications

References 45 publications

Study on the Performance and Mechanism of Cement Solidified Desulfurization Manganese Residue

Study on the Performance and Mechanism of Cement Solidified Desulfurization Manganese Residue

Properties and Microstructural Characteristics of Manganese Tailing Sand Concrete

Effects of electrolytic manganese residue (EMR) to co‐sintering mechanism of ceramic aggregate

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