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The aim of this paper is to study the potential of producing CSA cement with PG and the decomposition behavior of PG during the production of CSA cement. Experimental …
Literature reveals that about 10% of the Portland cement can be replaced with Phosphogypsum [33,34], while as [14,35] found 7.5% and 8% replacement can be achieved respectively. Islam et al. [22 ...
Natural limestone (mainly CaCO 3) is the only realistic calcareous source for large-scale cement manufacturing.Therefore, a reasonable option to lower the CO 2 emissions of cement production is to change the chemical composition of the cement [2] to require less calcium. Alternative binders can lead to significant emission reductions. Cements containing …
industrial production are given in Table 3. 5 PG as admixture for Portland cement 5.1 Phosphogypsum as mineralizing admixture The use of PG as mineralizer at Portland cement clinker calcination is known in many countries (Japan, Russia, Lithuania and others). Adding 2 to 3% of PG (1% of SO) )
1. Introduction. Portland cement is the dominant binder in concrete for civil infrastructures not only due to its superior mechanical properties, high durability, but also for its low production cost and easy to cast into different shapes [1].However, the production of Portland cement is an energy-intensive and resource-intensive process, resulting in …
In the cement production process, about 0.85–0.90 tons of CO 2 will be emitted for every ton of cement clinker produced on average. Among them, about 70% of CO 2 is emitted due to the decomposition of limestone into lime. If the lime generated by the decomposition of phosphogypsum is used to replace cement raw materials, the solid waste of ...
Disadvantages associated with the presence of impurities in phosphogypsum can be overcome when, instead of adding it directly to portland cement as a set-retarding additive, it is added to the raw mix before clinkering. ... One way to solve the problem is to produce phosphogypsum containing little or no impurities which adversely affect setting ...
Moreover, Shen et al. [13] employed various proportions of PG in the production of calcium sulphoaluminate cement. A mortar mixture for self-leveling was developed containing 40 % natural sand, 40 % PG and 20 % cement by Yang et al. [14]. In addition, PG can be used in the agricultural and rare earth elements sectors.
Recycling waste phosphogypsum (PG) into phosphogypsum-based cold-bonded aggregates (PCBAs) for eco-concrete production has received extensive attention due to its sustainability for construction industry development. Currently, PCBAs mainly replace the coarse aggregates in concrete while the fine aggregates remain natural sand (NS). This study …
Additionally, PBG cement can be mixed with aggregates to produce concrete or used in composite structures such as concrete-filled steel tubes. 6. ... Efficient precipitation of soluble phosphorus impurities in the recycling of phosphogypsum to produce hemihydrate gypsum. J. Clean. Prod., 396 (2023), 10.1016/j.jclepro.2023.136455. Google Scholar [4]
Liu [25] discovered that by using PCBAs instead of natural sand and stone to produce 100 m³ of concrete, the consumption of natural sand and stone can be reduced by 61.4 tons, energy consumption can be lowered by 3070 MJ, and carbon dioxide emissions can be decreased by 178.06 kg. Research has shown that PCBAs have great potential to replace ...
produce portland slag cement. Beneficiation of Phosphogypsum in the Pilot plant Based on the wet sieve technique, a pilot plant (Figurel) of capacity 1.0 tlshift was designed, fabricated, installed and successfully run to produce beneficiated phosphogypsum. The pilot plant con sisted of major equipments, such as mixers, vibratory
It has been widely accepted that the improvement of engineering properties of cement stabilized soil was attributable to the soil–cement–water reaction, which produced …
It is concluded that PG purified by 1% H2C2O4 treatment can be used for cement production. Meanwhile, this H2C2O4 treatment can effectively reduce the environmental pollution from PG and offer a ...
The detailed manufacturing process and study strategy were described in Fig. 2, where the preparation of ESPSC pastes contained two steps, i.e., original phosphogypsum modification and new cementitious material fabrication.A mix of fresh phosphogypsum, slag, and cement with a proportion of 94:2:4 was wet-milled firstly for 30 min by a horizontal ball mill and …
Phosphogypsum (PG) is an industry solid waste produced from phosphoric acid manufacture. To reduce environmental pollution of the PG, H 2 C 2 O 4 was employed to purify it, which then can be used for cement production. The optimal concentration of H 2 C 2 O 4 for PG purification was determined. In addition, differential thermal analysis (DTA), X-ray …
Phosphogypsum (PG) is a by-product produced during the wet process of phosphoric acid (H3PO4) production from natural phosphate rocks. Approximately 4–6 tons of …
This study proposed a new way to formulate a low energy super-sulfated cement (SSC) which can be used to produce self-compacting concrete (SCC) with high compressive strength and durability in ...
We also show that phosphorous from the phosphogypsum can be incorporated into the larnite crystal structure. The mechanical ... produce CSAB cement, the amount of replacement of reagent-grade chemicals with alternative raw materials can approach . Before XRF analysis, the phosphogypsum was dried at ...
The inevitably incorporation of P 2 O 5 impurity results in the poor quality of phosphogypsum (PG), which further hinders the utilisation of PG in manufacturing the supersulfated cement (SSC), an environment-friendly and energy-saving cement made almost entirely from industrial waste. Lime neutralisation provides a sustainable approach to remove …
Phosphogypsum is used in the chemical industry to produce phosphoric acid, a crucial ingredient in numerous types of fertilizers. ... Therefore, Phosphogypsum-containing …
To prepare phosphogypsum for using in cement production, gypsum is added in clinker to regulate or increase the setting time of cement; when phosphogypsum used instead of normal gypsum it obviously prolonged the hardening time compared to what usually needed with natural gypsum due to the presence of phosphate [33, 34].
The daily production of phosphogypsum in the town of Annaba (Algeria) amounts to 2600 tons for 500 tons of phosphoric acid. 1 Currently, this phosphogypsum is released into the sea after use. Phosphogypsum releases are detrimental on two fronts. ... Engineering properties of Wade sand-lime-cement-phosphogypsum building brick grade Int. J. Eng ...
Therefore, reducing the content of phosphate impurities in PG has become a key technology for industrial by-product gypsum for cement production. The phosphate impurities in PG can be categorized into soluble phosphate (H 3 PO 4), insoluble phosphate (undecomposed fluorapatite), and intercrystalline phosphate (CaHPO 4 ·2H 2 O) impurities ...
This work showed that phosphogypsum can be used in cement production both as set regulator and supplementary cementitious material to replace natural gypsum. ... Utilization of borogypsum as set retarder in Portland cement production. Cement Concr. Res., 32 (3) (2002), pp. 471-475. View PDF View article View in Scopus Google Scholar.
Phosphogypsum (PG) is a bulk industrial solid waste of wet-process phosphoric acid production. Every ton of phosphoric acid production generates as many as 4–6 tons of PG, including more than 90% of CaSO 4 ·2H 2 O, a small amount of phosphorus, fluorine, organic matter, oxides, heavy metals, radioactive substances and other impurities that have serious …
The results of unconfined compressive strength show that addition of 2–5% PG can promote the generation of C-S-H gels and react with cement to produce needle-like ettringite. Adding 20% FA will enhance the compressive strength because the pozzolanic reaction between FA and cement can produce C-S-H gels and hydrated calcium aluminates.
In this way, it seeks methods of using industrial waste to produce cement and technologies that minimize CO 2 emissions [4]. It is estimated that until 2050, there will be a 12–13% increase in cement production. ... Phosphogypsum can be chemically treated and …
This scheme substitutes phosphogypsum for part of the cement in the original cement-stabilized base, creating a cement-stabilized phosphogypsum mixed material (CSPM) base for road construction. The primary aim is to assess the energy consumption, carbon emissions, and environmental implications throughout various construction phases within the ...
Building elements made of phosphogypsum, such as wallboards and similar construction elements, give yield to high values of radon emanation together with the mentioned elevated …