Process of preparing chloride-free KNS compound
Request PDF | Process of preparing chloride-free KNS compound fertilizers from phophogypsum waste using a quaternary phase diagram | Phosphogypsum (PG), commonly known as calcium sulfate, is a ...
Effective and innovative procedures to use …
Simplified schema of phosphoric acid manufacturing process. Full size image. As shown in Table 1, the worldwide production of this waste is measured between …
Research on thermal decomposing properties of phosphogypsum with …
Phosphogypsum (PG), the main industrial by-product of phosphate fertilizer industry, primarily consists of calcium sulfate dihydrate. However, it contains various impurities with variable quantities depending on the origin of the phosphate rock. These impurities can restrict the reuse of phosphogypsum as a secondary primary resource.
Preparation and Performance of H-PDMS/PMHS/OTS Hybrid …
Hemihydrate phosphogypsum, an industrial solid waste product of phosphoric acid production, is abundant and inexpensive. If the problem of poor water resistance is solved, this material could be substituted for cement and other traditional energy-consuming cementitious materials in the construction industry. This approach …
Recycling of waste gypsum from αlpha-hemihydrate …
Schematic diagrams of recycling between dihydrate and hemihydrate gypsum: (a) theoretical principles of recycling; (b) practical problems of recycling. In …
Phosphogypsum recycling: New horizons for a more …
Abstract. It is aimed in this paper to suggest novel alternatives to recycle phosphogypsum (PG) in road applications. The performance of several formulations for …
Environmentally Friendly Concept of …
Figure 1 generalizes input and output flows for the process of extraction and treatment of phosphorite raw materials on the basis of LCA. Fig. 1. Block diagram of …
(PDF) Recycling phosphogypsum in road …
Phosphogypsum (PG) is a major hazardous by-product of the phosphate industry. The whole world is facing the challenge of increasing stockpiles of PG, which significantly affect safety and the ...
Valorization of wastes from the fertilizer industry: Current status and
Phosphogypsum (PG) is a solid waste generated during the wet process of phosphoric acid production. The environmental-friendly disposal and recycling of PG is vital in the field of environmental solid waste treatment. In this study, PG is used for adsorbent of dyes in wastewater to achieve the goal of recycling waste with waste.
Preparation of α-hemihydrate gypsum from phosphogypsum …
The schematic diagram of PG conversion into α-HH in glycerol and Na 2 SO 4 mixed solutions is shown in Fig. 6. The reaction process will pass through three stages successively: dissolution, dissolution-crystallization and equilibrium. Therefore, the conversion of PG into α-HH in solution follows the dissolution-crystallization principle.
Materials | Free Full-Text | In Situ Remediation of Phosphogypsum with
The accumulation of original phosphogypsum (OPG) has occupied considerable land resources, which have induced significant environmental problems worldwide. The OPG-based cemented paste backfill (OCPB) has been introduced as a promising solution. In this study, a water-washing pre-treatment was used to purify OPG, …
Major components of waste phosphogypsum …
Download scientific diagram | Major components of waste phosphogypsum obtained from the Recycling Plant Eko Harpoon sp. z o.o. from publication: Analysis of the mechanical strength, structure and ...
An integrated biochemical approach to …
Download scientific diagram | An integrated biochemical approach to production and utilization of phosphogypsum. from publication: Phosphogypsum Recycling: A Review of Environmental Issues ...
The granulated phosphogypsum: a-general view; b …
The general block-diagram of phosphogypsum recycling process with obtaining the mineral carrier for sulfur oxidizing microorganisms with their subsequent disposal in biochemical gas cleaning ...
The physical properties of granulated …
Five clusters were formed: a red cluster-phosphogypsum recycling in the construction industry; green cluster-radiation pollution problem of phosphogypsum and phosphate fertilizers; yellow cluster ...
Applied Sciences | Free Full-Text | Phosphogypsum …
The problem of recycling and storage of phosphogypsum is topical for many countries around the world, as it is associated with environmental problems of pollution of water …
Phosphogypsum Recycling: A Review of Environmental …
Overview of Studies on the Environmental Impact of Phosphogypsum Accumulation and Storage These specific conditions should be considered when choosing a method for removing and storing phosphogypsum in dumps: the production capacity; the amount of phosphogypsum that must be removed;
Phosphogypsum Recycling: A Review of
Phosphogypsum is an almost unused by-product of phosphate fertilizer production, which includes several valuable components—calcium sulphates and rare-earth elements such as silicon, iron, titanium, magnesium, aluminum, and manganese, as well as toxic elements such as heavy metals and others. Open storage of phosphogypsum in waste dumps is ...
Composition of major species and impurities in raw phosphogypsum …
Some of the major impurities in phosphogypsum were P 2 O 5, SiO 2, Al 2 O 3, traces of radionuclides and to a lesser extent, Na 2 O, MgO, Fe 2 O 3 and K 2 O. Similarities can be observed in the ...
Recycling phosphogypsum in road construction …
Phosphogypsum is usually a yellowish-white, light greyish-white or dark grey fine powdery solid. The main component of PG is CaSO 4 ·2H 2 O, which accounts for …
Minerals | Free Full-Text | Rare Earths' Recovery from Phosphogypsum
Figure 3 shows a proposed flow diagram of this process with a subsequent extraction of ... from phosphogypsum waste case study of the WIZOW chemical plant (Poland). J. Clean. ... L.J.P.; Nisti, M.B.; Mazzilli, B.P. Phosphogypsum recycling in the building materials industry: Assessment of the radon exhalation rate. J. Environ. …
Research hotspots and trends of comprehensive utilization …
Section snippets Data collection. The data source was the WEB of Science core database developed based on WEB by Thomson Scientific. The WOS Core database was chosen as the data source because it is considered to be the most comprehensive database, including the most influential and relevant journals.In the SCIE database, …
Phosphogypsum recycling: New horizons for a more …
Phosphogypsum (PG) is the by-product of the wet chemical attack process of phosphate ores (apatite) by sulfuric acid [1, 2]. It consists mainly of calcium sulfate …
Applied Sciences | Free Full-Text | Influence of Phosphogypsum …
This paper investigates the influence of a phosphogypsum dump on the surrounding environment (soil ecosystem) in the Sumy region (Ukraine). Analysis of the surrounding soils was performed to study the possible presence of compounds leaching from the dump. For physical chemical analysis of samples, X-ray fluorescence (XRF) …
(PDF) Exergy analysis of the process of wet-process
Schematic diagram of the wet-process phosphoric acid production with full recycling of sulphur from the waste phosphogypsum obtained Exergy balance of wet-process phosphoric acid production
Intra-soil waste recycling provides safety of environment
Amelioration and remediation technology was developed for phosphogypsum utilization in Haplic Chernozem of South-European facies (Rostov Region). The technology comprises phosphogypsum dispersed application into the soil layer of 20–45 cm during intra-soil milling. In the model experiment, the phosphogypsum doses 0 (control), 10, …
Environmental Impact of Phosphogypsum-Derived Building Materials …
The aim of the present work was to characterize the products obtained from the treatment of phosphogypsum residue by means of two recovery routes, and also to evaluate the concentrations of heavy metals and radionuclides in the materials obtained and their leachates. In this way, it is possible to determine how the most hazardous …
Phosphogypsum Recycling: A Review of Environmental …
Appl. Sci. 2021, 11, 1575 4 of 22 unwashed phosphoric and sulfuric acid, and phosphoric salts, and shows high corrosive activity. The issue of phosphogypsum disposal is still very relevant, for ...
Phosphogypsum: Properties and Potential Use in …
• Discuss the uses of phosphogypsum in agriculture as a fertilizer, amendment to degraded soils, and as an additive fertilizer industry. • Define the PG impacts on crop production, soil, water, and environment. 2 Phosphogypsum Generation and Storage Processes . 2.1 Phosphogypsum Generation Processes
A novel dynamic business model to quantify the effects of …
Five clusters were formed: a red cluster-phosphogypsum recycling in the construction industry; green cluster-radiation pollution problem of phosphogypsum and phosphate fertilizers; yellow cluster ...
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