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 this paper.

Reducing clinker factor in limestone calcined clay-slag cement using C-S-H seeding – A way towards sustainable binder March 2023 Cement and Concrete Research 168:107151

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 …

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 ...

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 ...

Other research experiments were performed to determine the effect of calcined phosphogypsum on the strength of fly ash–lime binders. ... Anhydrite binder calcined from phosphogypsum. Ceram. Silik. 54(2), 152–159 (2010) Google Scholar Leškevičienė, V., Nizevičienė, D.: Influence of the setting activators on the physical mechanical ...

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...

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 ... Since unground anhydrite binder was used, wa-ter-soluble sulphate activators were ...

The compressive strength of anhydrite binder was evaluated using a full factorial design. The multiple linear regression models were developed to correlate the significant variables to the ...

Subsequently, the hydration activity of low-temperature calcined anhydrite II was tested and compared with that of high-temperature calcination. The morphological analysis of both before and after hydration was conducted using SEM. ... Durability of phosphogypsum based water-resistant anhydrite binder. Cem. Concr. Res. (1990) G. Azimi et al ...

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 ...

The analysis of the effect of the additives on the properties of the anhydrite binder (Tables 2, 3) shows that the binding of the calcined material with the additives of the dust from a...

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 .

Keywords: phosphogypsum, neutralized phosphogypsum, anhydrite binder, calcined, additives 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 this paper.

Figure 8. X-ray diffraction patterns of hydrated anhydrite binder: 1 - 1 mixture, 2 - 2, 3 mixtures, 3 - 4 mixture, 4 - 5 mixture. Composition of mixtures is reported in Table 1. Indexes: A - anhydrite CaSO4; G - gypsum CaSO4·2H2O; E - gismondite CaAl2Si2O8·4H2O; H - calcium aluminium silicate hydrate Ca2Al2SiO7·8H2O - "ANHYDRITE BINDER CALCINED FROM …

Anhydrite binder calcined from phosphogypsum-The possibility of applying lime neutralized phosphogypsum as a raw material for obtaining anhydrite binder was investigated in this paper. The effect of the calcination. Consulta · Phosphogypsum (PG), as a bulk industrial solid waste with high and complicated impurities content, makes it difficult ...

Combined action of calcined siltstone and lime leads to a 45% increase in strength due to the additional compaction by new hydration products formed in the course of metakaolin and lime interaction. ... minerals proves that finely ground siltstone can be used as a mineral additive in the composition of the anhydrite binder, accelerating ...

Gypsum remains one of the most common mineral binders. Gypsum-based products are known as being environmentally friendly materials. The main component of the products is calcium sulphate, which exists in hydrous and non-hydrous compounds: dihydrate (CaSO 4 ·2H 2 O), hemihydrate (CaSO 4 ·0.5H 2 O) and anhydrate (CaSO 4)pared to …

Anhydrite cement is widely utilized in the construction industry in many countries. It is gypsum calcined at high temperatures (600-700 °C) [14].Alum plaster is a product obtained by mixing ...

This paper clarifies phenomena occurring during the production of gypsum binder, anhydrite, and potentially eco-friendly calcium sulfate-based ceramics at 22–1300 °C by in-situ XRD, thermal analysis, and SEM. ... the primary raw material for calcined gypsum production, is formed in significant quantities during the desulphurization of ...

DOI: 10.1016/j.conbuildmat.2023.134742 Corpus ID: 266779828; Preparation and properties of II-anhydrite calcined from phosphogypsum @article{Hua2024PreparationAP, title={Preparation and properties of II-anhydrite calcined from phosphogypsum}, author={Ying Hua and Jueshi Qian and Zhen Li and Yujie Liu and Fumin Dai and Lu Yuan and Xing-wen Jia}, …

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, carbonates) and ...

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 their amount …

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 ...

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 …

It was determined that the phosphogypsum with additives calcined at the temperature 900 oC, 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 setting duration up to 13-38 min, the compressive strength of the dry ...

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.

In this paper, raw PG by adding the soluble phosphorus (P 2 O 5) and fluorine (F) content of 0–1.5 wt% was used to prepare anhydrite with calcination treatment method, and …

Calcined PG as binder can be an eco-friendly material. Abstract. The calcination at low temperatures transforms phosphogypsum (PG) waste in a material with binder properties. ... Anhydrite binder calcined from phosphogypsum. Ceram. Silikaty., 54 (2010), pp. 152-159. View in Scopus Google Scholar [42] B. Ma, Z. Jin, Y. Su, W. Lu, H. Qi, P. Hu.