Enhancement of magnesium phosphate cement solidification of Pb2+ by K-struvite whisker in lead-contaminated solution

Pang, Bo; Li, Jun; Wang, Baomin; Yang, Yuanquan

doi:10.1016/j.jclepro.2021.128848

Cited by 22 publications

(9 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The broad band in the 3800–2200 cm −1 region was assigned to the O-H stretching vibration. According to the references [ 40 , 44 , 45 , 46 ], the broad band at 3510 cm −1 in the sample A2 and B3 was assigned to the OH stretching vibration of the crystalline water, whereas it shifted to the low frequency (2950, 2350 cm −1 ) with the existence of fairly strong hydrogen bonds in the structure of KMgPO 4 ·6H 2 O or NaMgPO 4 ·6H 2 O.…”

Section: Resultsmentioning

confidence: 99%

“…In the sample B3, the weight loss at around 90 °C was as low as 2.31%, indicating that less of the hydration product was formed. The similar decomposition curves in both sample B3 and C2, suggested that amorphous NaMgPO 4 ·6H 2 O may be responsible for the weight loss in the EFS-NaH 2 PO 4 system [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

“…The phase compositions of EFS and EMPC were analyzed by an XRD (X’ Pert-PRO, Philips, Amsterdam, Netherlands) with a Cu Kα radiation (1.5406 Å) from 10° to 80° at a scanning speed of 10°/min. The thermal stability of EMPC was explored by TG/DTG (STA 2500, Netzsch, Selb, Germany) at a heating rate of 10 °C/min in a flowing nitrogen atmosphere [ 25 , 40 ].…”

Section: Methodsmentioning

confidence: 99%

“…For ion (Mg, K, Na, P, Si)-concentration measurements, a disposable syringe filter (Zhiyu, Taixing, China) assembled with a 0.22 μm filter membrane was used to collect and filter the EMPC suspension (0.5 mL) at each of the set reaction times. Then, the obtained filtrate was diluted to 20 times and immediately acidified with enough nitric acid solution (2%, mass concentration) to prevent the precipitation reaction between Mg 2+ , K + , Na + and PO 4 3− before determining the ions concentrations using ICP-AES (Optima 3200 RL, Perkin Elmer, Waltham, MA, USA) [ 40 ].…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Influence of Phosphorus Sources on the Compressive Strength and Microstructure of Ferronickel Slag-Based Magnesium Phosphate Cement

et al. 2022

View full text Add to dashboard Cite

Electric furnace ferronickel slag (EFS) is a typical magnesium-rich industrial by-product discharged from the manufacture of nickel and iron-nickel alloys. The approach to use it as the raw material for the preparation of magnesium phosphate cement (MPC) has potential and proves effective. In this study, three different phosphorus sources (PS) including phosphoric acid (H3PO4, PA), sodium dihydrogen phosphate (NaH2PO4, SDP) and potassium dihydrogen phosphate (KH2PO4, PDP) were used to react with EFS to prepare the EFS-based MPC (EMPC), and the effects of raw material mass ratio (EFS/PA, EFS/SDP, EFS/PDP) on the compressive strength, early hydration temperature and microstructure of EMPC pastes were investigated. Results showed that the compressive strength of EMPC paste is significantly impacted by the type of phosphorus source and the raw materials mass ratio. When the EFS/PDP ratio is 4.0, the compressive strength of the MPC paste reaches up to 18.8, 22.8 and 27.5 MPa at 3, 7 and 28 d, respectively. Cattiite (Mg3(PO4)2·22H2O), K-struvite (KMgPO4·6H2O) and/or Na-struvite (NaMgPO4·6H2O) were identified as the main hydration products of EMPC. The development of EMPC mainly involves the dissolution of a phosphorus source, MgO and Mg2SiO4, formation of hydration product as binder, and combination of the unreacted raw materials together by binders to build a compact form.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Phosphorus Sources on the Compressive Strength and Microstructure of Ferronickel Slag-Based Magnesium Phosphate Cement

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Magnesium phosphate cement (MPC) is a kind of inorganic cementitious material [ 1 ], formed by hard or dead burnt magnesia, soluble phosphate, mineral admixture, retarders, and water. MPC has been widely used in the fields of rapid repair of concrete pavements, highways, bridge decks, runways, solidification of heavy metals, refractories, and biomedical engineering [ 2 , 3 ], due to its advantages such as fast setting, rapid strength gain, stronger bonding to concrete substrate, and good corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Hydration Performance of Magnesium Potassium Phosphate Cement Using Sodium Alginate as a Candidate Retarder

et al. 2022

Self Cite

View full text Add to dashboard Cite

Retarders are important factors controlling the hydration and properties of magnesium potassium phosphate cements (MKPCs). Boric acid and borax are the most commonly used retarders for MKPC which could control the setting time in a wide range upon changing their content. However, with the increase in borax content, the early strength of MKPC can be reduced, and boron compounds are now included in the EU candidate list of substances of very high concern for authorization, due to their reproductive toxicity. Exploring alternative set retarders to boron compounds is, thus, of significance. This work investigated the effects of a candidate retarder, namely, sodium alginate, on the setting time, mechanical properties, hydration products, and microstructures of MKPC. Sodium alginate presented dramatically retarding effects on MKPCs in the range of 0% to 2% (by mass of water). One percent of sodium alginate by mass of water could extend the setting time of MKPCs from 15 min to 35 min, which presented a better retarding effect than borax (a typical retarder for MKPCs) and produced higher early strength of MKPCs. Adding no more than 1% of sodium alginate did not have a notably adverse effect on the formation of hydration product over the long term, but an unfavorable effect could be found regardless of the sodium alginate content, which could reduce the compressive strength of MKPCs.

show abstract

Sustainable magnesium phosphate micromortars formulated with PAVAL® alumina by-product as micro-aggregate

Huete-Hernández

Maldonado-Alameda

Alfocea-Roig

et al. 2023

Boletín de la Sociedad Española de Cerámica y Vidrio

View full text Add to dashboard Cite

Enhancement of magnesium phosphate cement solidification of Pb2+ by K-struvite whisker in lead-contaminated solution

Cited by 22 publications

References 44 publications

Influence of Phosphorus Sources on the Compressive Strength and Microstructure of Ferronickel Slag-Based Magnesium Phosphate Cement

Influence of Phosphorus Sources on the Compressive Strength and Microstructure of Ferronickel Slag-Based Magnesium Phosphate Cement

Hydration Performance of Magnesium Potassium Phosphate Cement Using Sodium Alginate as a Candidate Retarder

Sustainable magnesium phosphate micromortars formulated with PAVAL® alumina by-product as micro-aggregate

Contact Info

Product

Resources

About