MENU
The results showed that the density of the anhydrite calcined at different temperatures increased gradually (Figure 2). The relationship between the density and the calcination temperature can be described with a linear regression function. ... The anhydrite binder obtained at the temperature of 500 °C was fully hydrated after 28 days (degree ...
عرض المزيد
It is known that the incorporation of gypsum in calcined gypsum plasters ... Anhydrite binder calcined from phosphogypsum, Ceram.-Silik. 54, 2, pp. 152-159 (2010) [25] Müller, M.; Lang, G.: New PCEs targeted selection of superplasticizers for various binder systems. ZKG International 69, Drymix Special, pp. 30-33 (2016)
عرض المزيد
Tiling to anhydrite screeds. Calcium Sulfate or anhydrite screeds have grown in popularity over the last decade as they can offer installation benefits over traditional sand:cement screeds. Efficient to install, low cost, pumpable, self-levelling and offering minimal shrinkage, anhydrite screeds are perfect for domestic or commercial …
عرض المزيد
It was determined that the phosphogypsum with additives calcined at the temperature 900°C, and the following grinding of it to the specific surface area 600 ± 10 m²/kg allow obtaining the fast setting anhydrite binder. The anhydrite binder calcined with the addition of 5% ground glass exposes the best physical and mechanical properties: the ...
عرض المزيد
The phosphogypsum – dihydrate calcium sulphate is waste material of phosphoric acid production from the Kola apatites. The possibility of applying lime neutralized phosphogypsum as a raw material for obtaining anhydrite binder was …
عرض المزيد
ANHYDRITE BINDER CALCINED FROM PHOSPHOGYPSUM @inproceedings{Lekeviien2010ANHYDRITEBC, title={ANHYDRITE BINDER CALCINED FROM PHOSPHOGYPSUM}, author={Violeta Le{vs}kevi{vc}ienė and Dalia Nizevi{vc}ienė}, year={2010} } V. Leškevičienė, D. Nizevičienė; Published 2010; …
عرض المزيد
The particle size of anhydrite calcined at 650 ºC-750 ºC decreased with calcination temperature, resulting in closer packing [37]. Thus, the water requirement decreased and the rheological properties of PG paste were improved. However, all the characteristic particle sizes of anhydrite calcined at 800 ºC were larger than those of …
عرض المزيد
The phosphogypsum – dihydrate calcium sulphate is waste material of phosphoric acid production from the Kola apatites. The possibility of applying lime neutralized phosphogypsum as a raw material for obtaining anhydrite binder was investigated in …
عرض المزيد
The calcined clay and anhydrite contents were kept constant at 30 wt% and 5 wt%, respectively. An equivalent amount of OPC was replaced by more limestone. The strength of the pure OPC reference at the corresponding ages is indicated with a blue dashed line. ... LC 3-53 with 2 wt% anhydrite: binder mix made of 53 wt% OPC, 30 wt% …
عرض المزيد
Durability of phosphogypsum based water-resistant anhydrite binder. Author links open overlay panel Manjit Singh, Mridul Garg, S.S. Rehsi. Show more. ... Singh et al. (1990) calcined PG at 800 °C for 4 h. Rashad (2015) calcined PG at 850 °C for 2 h. Leškevičiene and Nizevičiene (2014) calcined PG at 800 and 900 °C for 30 min. Smadi …
عرض المزيد
The grinding of the calcined anhydrite binder (with additives as well as without additives) to the same specific surface area (600 ± 10 m 2 /kg) at the different temperatures proved the...
عرض المزيد
The production of anhydrite binder corresponded to reaction (3). (3) CaSO 4 ·2H 2 O = CaSO 4 + 2H 2 O. After firing, the anhydrite granules were ground together with activator additives, such as Portland cement, Ca(OH) 2, K 2 SO 4, which enabled to study the strength characteristics of the anhydrite binder. Surface morphology and …
عرض المزيد
The obtained results showed that as the calcination temperature increased, the compressive strength of anhydrite binder decreased at its early age (up to 3 days) and …
عرض المزيد
Experiments were performed to investigate the properties of fly ash-calcined phosphogypsum (PG) cementitous materials with PG different thermally treated, including ... This research is devoted to modification of physical and mechanical properties and structure of a binder based on natural anhydrite. A sedimentary rock siltstone was added into ...
عرض المزيد
A typical floor screed consists of a binder, ... Carbon footprint analysis of calcined gypsum production in the Czech Republic. J. Cleaner Prod. (2018) N. Lushnikova et al. ... Anhydrite has a much slower hydration rate and strength development than hemihydrate gypsum, and is commonly blended with cement, strong alkali or alkali …
عرض المزيد
the production of a high-performance anhydrite binder [28,29]. The FGD gypsum calcined at 650 C for 4 h was used in the mixture of Portland cement to produce self-levelling floors [30]. Anhydrite cement was obtained from FGD gypsum, which was burnt together with activators, such as glass and cupola dust, at 800 and 900 C [31].
عرض المزيد
The anhydrite binder calcined with the addition of 5% ground glass exposes the best physical and mechanical properties: the setting duration up to 13-38 min, the compressive strength of the dry ...
عرض المزيد
Anhydrite. P2O5 and F impurities. Performances. Microstructure. 1. Introduction. Phosphogypsum (PG) is the main solid waste generated from the …
عرض المزيد
anhydrite binder calcined from phosphogypsum - Ceramics-Silikaty EN English Deutsch Français Español Português Italiano Român Nederlands Latina Dansk Svenska Norsk Magyar Bahasa Indonesia Türkçe Suomi Latvian …
عرض المزيد
Experiments were performed to investigate the properties of fly ash-calcined phosphogypsum (PG) cementitous materials with PG different thermally treated, …
عرض المزيد
According to Min et al., the addition of calcined and milled phosphogypsum to the fly ash–lime systems accelerates the pozzolanic reaction of fly ash and greatly …
عرض المزيد
The anhydrite binder calcined with the addition of 5% ground glass exposes the best physical and mechanical properties: the setting duration up to 13-38 min, the compressive strength of the dry ...
عرض المزيد
We compared our model binder mix (70 wt% OPC, 7 wt% anhydrite, and 23 wt% limestone powder with 1.11 % solid of HyCon ... Calcined clay (CC) and limestone powder (LS) ...
عرض المزيد
Calcination can reduce the soluble and co-crystal P 2 O 5 content of Phosphogypsum (PG). Ⅱ-anhydrite calcined from PG at 800 ºC had the best …
عرض المزيد
Double-sided tuning effects of lactic acid on the hydration, microstructure and strength of supersulfated cement. In this study, hemihydrate gypsum was employed to produce supersulfated cement (SSC), and lactic acid was used to address the poor workability induced. The results indicated that lactic acid….
عرض المزيد
Flue gas desulfurization gypsum (FGD gypsum) is obtained from the desulphurization of combustion gases in fossil fuel power plants. FGD gypsum can be used to produce anhydrite binder. This research is devoted to the investigation of the influence of the calcination temperature of FGD gypsum, the activators K2SO4 and Na2SO4, and …
عرض المزيد
Ceramics – Silikáty 54 (2) 152-159 (2010) from publication: Anhydrite binder calcined from phosphogypsum | The phosphogypsum – dihydrate calcium sulphate is waste material of phosphoric acid ...
عرض المزيد
The anhydrite binder calcined with the addition of 5% ground glass exposes the best physical and mechanical properties: the setting duration up to 13-38 min, the compressive strength of the dry ...
عرض المزيد
The combination of calcined clay with other supplementary cementitious materials (LC3+), including microsilica, slag (GGBFS), and fly ash, was investigated. The impact of anhydrite content and ...
عرض المزيد
Anhydrite binder calcined from phosphogypsum. Article. Full-text available. Jan 2010; Violeta Leškevičienė ...
عرض المزيد
Then PG was calcined at 150 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, 700 °C, and 800 °C for 3 h in a muffle furnace to obtain hemihydrate or anhydrite. After the calcination, the calcined PG (CPG) was ground to a specific surface area (420 ± 20) m 2 /kg, and the particle size distribution of CPG was shown in Fig. 2 .
عرض المزيد
A clinker-free and low-clinker cementitious binder approach was proposed based on portlandite, supplementary cementitious materials (SCMs), a sulfate source and an accelerator. The impact of ordinary Portland cement (OPC), portlandite, calcined clay and anhydrite on the strength of the seeded-CFC (with C-S-H seeding) was investigated.
عرض المزيد
The effects of calcination and modification on the morphology (shapes and textures) and crystal structure of anhydrite powders were studied. The results show that, calcination at 100°C causes anhydrite to disintegrate into smaller crystals, accompanied by a slight increase in d-spacing. Without calcination and modification, the solidification time …
عرض المزيد
Gypsum (CaSO 4 2H 2 O) and anhydrite (CaSO 4) are the most common sulfate minerals.The predominant part of gypsum and anhydrite is used as raw materials for the production of gypsum binders (construction gypsum) and additives in various types of cements, to a lesser extent–for the production of hard-burnt, high-strength, molding …
عرض المزيد
The paper deals with an investigation about the production of high strength plaster from the waste phosphogypsum and its use in making flooring tiles. To achieve this objective, phosphogypsum was calcined at 900–1000 °C to anhydrite which was mixed with suitable chemical activators (alkali/alkaline earth hydroxides, sulphates, …
عرض المزيد
In order to obtain calcined gypsum, PG was heated in an electric oven at 150 °C for 2 h [24], and Garg et al. [25] prepared β-hemihydrate gypsum at 150–160 °C for 4 h. ... Anhydrite binder calcined from phosphogypsum. Ceramics Silikaty, 54 (2010), pp. 152-159. Google Scholar [21]
عرض المزيد
Copyright © 2024 Sofol Industry & Technology Group Co., Ltd.
المنتجات
محلول
حول الولايات المتحدة
اتصل بنا