آخرین محصولات
Effect of Phosphogypsum on the Properties of Portland …
Phosphogypsum could be used as a substitute of natural gypsum in the production of Portland cement to control the hydration reaction rate of cement. In this …
Resource utilization and development of phosphogypsum …
1. Introduction. 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 …
Reuse of phosphogypsum pretreated with water washing as …
Global production of PG is estimated to be around 100–280 Mt annually, ... Singh, M. Treating waste phosphogypsum for cement and plaster manufacture. Cement. Concrete.
Calcium sulphoaluminate cements made with phosphogypsum: Production
Phosphogypsum (PG) is an industrial waste from the production of phosphoric acid.The impurities in PG limit its utilization in building materials, and make PG decompose easily at high temperatures. Calcium sulphoaluminate (CSA) cements are insensitive to the presence of impurities and show some desirable performance. The aim …
Mechanical Properties and Optimal Mix Design of …
This paper investigated two systems of lightweight soil, namely phosphogypsum cement and microsilica system (PGCF) and phosphogypsum cement and slag powder system (PGCS), which are …
Treating waste phosphogypsum for cement and plaster …
The purified phosphogypsum can be used as an additive in place of mineral gypsum in the manufacture of ordinary Portland cement and Portland slag cement conforming to Indian Standards. ... Lastly, when using 80 % phosphogypsum aggregate instead of natural sand and gravel to produce 100 m 3 of concrete, 42 t of …
Properties, Purification, and Applications of Phosphogypsum: …
Phosphogypsum (PG) is a by-product produced during the wet process of phosphoric acid (H 3 PO 4) production from natural phosphate rocks. Approximately 4–6 …
(PDF) Alternative raw materials for the production of calcium
The production of ferrite-rich calcium sulfoaluminate belite (CSABF) cement clinker, also containing MgO, from ladle slag, Fe-slag, and phosphogypsum was translated from a lab-scale to a pilot ...
Sustainable Utilization of Phosphogypsum in Multi-Solid …
This study contributes to sustainable construction practices by exploring the use of phosphogypsum, a commonly discarded byproduct, in the production of recycled aggregates. Addressing both environmental and economic aspects of sustainability, we investigate the feasibility of employing phosphogypsum as a primary raw material, in …
Valorization of phosphogypsum in cement-based materials…
China is a significant producer of phosphogypsum production; the annual growth rate of phosphogypsum is about 70 million metric tons, of which the comprehensive utilization rate is only 15 percent.
Optimization of non-autoclaved aerated concrete using phosphogypsum …
Phosphogypsum could be used as a substitute of natural gypsum in the production of Portland cement to control the hydration reaction rate of cement. In this study, raw phosphogypsum was collected ...
Effect of Phosphogypsum on the Properties of …
Phosphogypsum could be used as a substitute of natural gypsum in the production of Portland cement to control the hydration reaction rate of cement. In this study, raw phosphogypsum was...
Value-added utilization of phosphogypsum industrial by …
In recent years, many scholars have conducted research on the preparation of light aggregates from phosphogypsum and their application in concrete production [16], [17].For example, Wang et al. [8] had developed light aggregate containing 80% or more phosphogypsum, and the aggregate is applied to the road base. The prepared …
Application of Lime Neutralised Phosphogypsum in Supersulfated Cement
The main reason for this is that the sulfate in phosphogypsum can cause the composite cementitious material to generate a large amount of ettringite and accelerate the dissolution of red mud and ...
Incorporation of phosphogypsum with cement in rigid …
This experimental study suggests that phosphogypsum from industrial waste can be used as a cement substitute in concrete production. After 7 and 28 days, fresh …
Utilization of phosphogypsum in portland cement industry
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 …
Valorization of phosphogypsum in cement-based materials: …
Current demand for waste recycling, phosphogypsum-based excess-sulphate slag cement (PESSC) as a sustainable cement prepared by solid wastes, urges …
Treating waste phosphogypsum for cement and plaster …
The purified phosphogypsum can be used as an additive in place of mineral gypsum in the manufacture of ordinary Portland cement and Portland slag cement conforming to Indian Standards. 4. The purified phosphogypsum can be used for the production of gypsum plaster for use as a building material.
Treated phosphogypsum as an alternative set regulator and …
This work showed that phos- 434 phogypsum can be used in cement production both as set regulator and supplementary 435 cementitious material to replace natural gypsum. ... Bhadauria, R.B. Thakare, Utilisation of phosphogypsum in cement mortar and concrete, 31st Conference on our world in concrete & structures, 2006, pp. 16-17. [29] A.M. …
Deep removal of phosphate impurities in phosphogypsum …
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) …
Effect of phosphogypsum on physiochemical and …
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 primary and secondary cementitious materials in soil. 3, 37, 38 Hence, the analysis on the mineralogical composition of cement and phosphogypsum stabilized soil can provide a ...
Preparation of gypsum with high purity and whiteness from phosphogypsum …
Cai, Q. et al. Efficient removal of phosphate impurities in waste phosphogypsum for the production of cement. Sci. Total Environ. 780, 146600 (2021).
Calcium sulphoaluminate cements made with phosphogypsum: Production …
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 results indicated that PG can be utilized to produce CSA cement, and the suitable firing temperature is between 1250 and 1300 °C. Results also show that the …
Effect of Phosphogypsum on the Clinkerization …
At present, it is regarded as a promising technology for comprehensive utilization of PG to produce cement clinker and sulfuric acid. In order to enhance the effectiveness of PG pyrolysis, a lot ...
Collaborative Utilization Status of Red Mud and …
The use of red mud and phosphogypsum to produce cement can not only reduce the resource consumption, lower costs, and consume significant amounts of …
Alternative raw materials for the production of calcium …
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 ...
Potential use of phosphogypsum in concrete
1. Introduction. Phosphogypsum (PG) is a by-product resulting from the phosphoric acid process for manufacturing fertilizers. It consists mainly of CaSO 4 • 2H 2 O and contains some impurities such as P 2 O 5, F −, and organic substances.The quantity of PG produced is very large: for each 1 ton of phosphate (P 2 O 5) produced, there is a …
Utilization of solidified phosphogypsum as Portland cement retarder
Phosphogypsum (PG) is typical chemical gypsum, which is the by-product obtained from the reaction between the phosphate rock and sulphuric acid during the production of phosphoric acid, compound fertilizers and synthetic detergent [].Normally, the PG contains 0.1–1.5 % of F −, a small quantity of heavy-metal ions and radioactive …
Effects of ettringite seed on the hydration and properties of
Phosphogypsum was the by-products of wet production of phosphoric acid, it has more than 0.4 billion ton of emissions and less than 10% utilization rate in China. Nowadays, many researchers have attempted to handle with phosphogypsum, such as manufacturing β-hemihydrate gypsum and retarder for cement ( Bensemlali et al., 2022 ).
(PDF) Moroccan Phosphogypsum: Complete Physico …
Anhydrite cement can be manufactured with PG up to 60% . ... This work presents the first results of the use of phosphogypsum (rejection of the production of phosphoric acid) in the manufacture of ...
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